MXPA03004901A - Barrier preventing wood pest access to wooden structures. - Google Patents

Abstract

A multi-layer wood pest barrier having a prolonged lifetime that can be as long as the life of a building or structure to be protected. The lifetime protection is achieved by binding at least one pesticide within a continuous or discontinuous polymer matrix layer thereby substantially reducing release of the pesticide from the matrix. The release rate of the pesticide from the matrix can be controlled by the use of a carrier such as carbon black. The release of the pesticide from the barrier can be further controlled by inclusion of additional layers which can make the barrier substantially non-releasing.

Description

Wood for the long term protection of these areas and / or structures. More particularly, the present invention relates to long-term protective barriers and methods that prevent pests from entering protected areas and / or structures, especially areas containing wooden objects and structures that may contain wood. The present invention also relates to methods for making the protective barrier and methods for incorporating them around the areas and / or structures. BACKGROUND OF THE INVENTION Wood that is in contact with concrete, such as in constructions of wood and wood buildings that is in contact with the ground, for example, fence posts, utility poles, cross railway sleepers and wooden supports, can degrade structurally by the action of one or more wood pests, including but not limited to, termites, ants and other drilling insects. Insecticides are available to protect the wood against the action of these pests. Commercial methods that are currently used to control pests such as wood-boring insects, include spraying with insecticides, fumigation with insecticides such as by sealing an entire structure and releasing an insecticide there, and placing discreet on-site insecticides spaced on the ground by under the foundation and when treating the ground under the foundation of the construction, before and after construction, with prolonged residual insecticides, in order to repel and / or exterminate insects such as termites. These current business methods have a variety of disadvantages. For example, a common method involves treating the underlying ground to the foundations of constructed constructions be pre- pared with an insecticide to avoid termite infestation. The insecticide is typically sprayed on and on the ground before construction. Due to the lack of communication between the pesticide applicator and construction workers, the treated land often loses its continuity during construction, and even more, the available field insecticides tend to lose their biological activity after a period of time. time in the proportion that the treated land is even more effective in terms of termite invasion. The use of insecticides in spraying and spraying can be harmful to the environment and to the occupants, humans and animals of a household. In addition, a significant release of insecticides when spraying and devices that provide rapid freedom gives a relatively short lifespan for protection against pest entry. Due to rapid release, insecticides should be applied repeatedly at intervals of a few days or a few months or a year to remain effective. When insecticides are placed on the ground, significant amounts of insecticides are generally released into the environment. These releases can be harmful to insecticide applicators, people who reside in or visit the insecticide application site and can be harmful to the environment. Applying insecticides in an amount sufficient to be effective over a prolonged period of time is also undesirable. Applying large amounts of insecticides presents ecological and health considerations that can cause unpleasant odors, leaching the soil, and volatility of the insecticide. Even when large amounts of insecticide are applied, the insecticides dissipate in a relatively short time and need to be applied again. Another disadvantage of applying large amounts of insecticide is that the concentrations begin well above the minimum level necessary for effectiveness, decrease rapidly and fall below the minimum effective level necessary to maintain a barrier within a short period of time with respect to the useful life of the product. the construction According to this, colonies of termites established in the field can then invade the structure if additional chemical is not applied below and around the structure. A common method to apply additional insecticide is to introduce it around the foundation of the construction by injection into the ground underlying the concrete foundations, soak the ground around the perimeter of the construction or a combination of both. This type of post-construction treatment is intense in labor and can. not produce adequate continuous protection. Therefore, there is a need to provide and maintain a long-term protection for areas and structures such as wooden structures using methods and devices that do not have the aforementioned disadvantages. COMPENDIUM OF THE INVENTION The present invention provides a barrier for wood pest, multilayer, which has a prolonged useful life that can be prolonged as the useful life of a construction or structure to be protected.

The lifespan protection is achieved by ligating at least one pesticide within a continuous or discontinuous polymer matrix layer, thereby substantially reducing the release of the pesticide from the matrix. The rate of pesticide release from the matrix can be controlled by the use of a carrier such as carbon black or gas black. The release of pesticide from the barrier can also be controlled by the inclusion of additional layers that can render the wood substantially non-releasing. In addition, the barrier may include one or more layers such as, for example, thin canvas, mesh, sheet and combinations thereof. The additional layer (s) may also contain one or more pesticides that are the same or different as compared to the pesticides in the polymer matrix layer of the multilayer barrier. The pesticides are allowed to come off the additional layer (s) for improved short-term protection. The barrier and / or one or more additional layers are made with a polymer selected from the group consisting of thermoplastic polymers, thermoset polymers, elastomeric polymers and their copolymers. By incorporating the pesticide (s) into the polymers, the pesticide (s) can be held or released at such a rate that they remain effective as toxic or repellent for pests and insects capable of damaging wood structures for a prolonged period of time, while At the same time they maintain sufficient concentrations inside the barrier to avoid penetration of insects through the barrier. In accordance with one aspect of this invention, a carrier-polymer system is provided, wherein the pesticide is linked to the carrier as a bonded friable mixture. A polymer matrix taken from the mixture is made from a thin polymer sheet or film. The sheet with the bonded friable mixture is then placed near a wooden structure to provide a barrier that does not penetrate wood pests. An additional layer can provide means for its relative and slow constant release of the volatile insecticide in order to create a barrier zone beyond the barrier itself in the soil around a wooden structure. The polymers include thermoplastic polymers, thermoset polymers, elastomeric polymers as well as their copolymers and the insecticide comprises the family of insecticides known as pyrethrins. According to another aspect of this invention, an exclusion zone is created by placing an extrusion near the wooden structure to be protected. The extrusion has a polymeric delivery system that includes a carrier capable of controlled release of the insecticide. The system maintains a uniform and effective concentration of insecticide in the exclusion zone for large stretches of time. According to another aspect of this invention, a granule or pill comprising a polymer and insecticide, is provided to create and maintain an equilibrium concentration of insecticides for ants, termites, and other insects that perforate the wood in an exclusion zone for the wooden structure. The nodule is placed near a wooden structure to treat the ground in order to protect the wooden structure against termites, ants and other drilling insects. The granule can be placed close to the structure by a variety of means. Additionally, the granule can be embedded in a board or even included in a foam. In preferred embodiments, the polymers include thermoplastic polymers, thermoset polymers, elastomeric polymers as well as their copolymers and the insecticides are pyrethrins. According to another aspect of this invention, an exclusion zone is created by injecting a hot melt polymer blend. The controlled release device comprises one or more pyrethrins and the polymer is selected from the group consisting of thermoplastic polymers, elastomeric polymers and their copolymers. In accordance with a further aspect of the present invention, temperature controlled controlled release devices are used to provide the exclusion zones. According to another aspect of this invention, the controlled release device is used to fumigate structures. It is convenient to place a barrier or create an area to avoid any contact between the wooden structure and insects capable of damaging these structures. An exclusion zone is necessary to protect wooden structures for prolonged periods of time. In a further aspect of the present invention, a high density polymer having a low volatility insecticide, provides a low rate of insecticide release is combined with a low density (soft) polymer having more volatile insecticide to provide an area of reliable exclusion. According to another aspect of the invention, a multi-layer barrier prevents penetration of pests such as crawling wood and termite insects into protected areas or structures for a prolonged period of time while avoiding harmful effects on barrier installers, people who visit or occupy protected areas or structures and the environment. The barrier includes an active inner layer (i.e. the pesticide release layer) that contains and releases or releases a pesticide. The barrier also includes two pesticide retaining layers that only allow small amounts of the pesticide to be released from the barrier. The active inner layer is sandwiched between two pesticide retention layers such that substantially no pesticide is released from the barrier. One or more additional layers may be included between the pesticide retention layers and the pesticide release layer. According to one aspect of the invention, the barrier comprises a plurality of polymeric layers that are joined together to form a thin flexible film. The film can be placed to encircle areas (such as foundations for homes) that need to be protected against crawling insects such as termites and other pests. According to another aspect of the present invention, the barrier film is preconfigured off-site to fit in its intended location before being placed in the intended location such as in the excavation for the foundation of a house. According to a further aspect of the present invention, the multi-layer barrier is in the form of a thin sheet or film that includes at least one layer that provides overall strength and puncture resistance to the sheet or film. According to yet another aspect of the present invention, the multi-layer barrier includes outer protective layers that protect the ultraviolet (UV) barrier during installation and when the barrier is subsequently exposed to sunlight. According to a still further aspect of the present invention, the pesticide is released from the active layer in a controlled manner to assist in achieving a substantially non-releasing barrier. In other words, the release or release of only small amounts of the pesticide from the barrier can be aided by controlling the release of the active layer. The present invention also provides efficient methods for making the multilayer barrier using conventional, commercially available equipment. In accordance with one aspect of the present invention, lamp black or gas black is used in a pre-mix to produce the active layer. Lamp black achieves the desired pre-mix fluidity but unlike a number of other types of carbon black, lamp black does not have harmful effects on the activity of the pesticide. Lamp black has been found to not deactivate or break down pesticides. According to another aspect of the present invention, to produce the pre-mix, all or at least a larger portion of the carbon black is mixed with polymer particles before adding the pesticide. This approach minimizes the harmful effects of carbon black on the activity of the pesticide. According to a further aspect of the present invention, one or more tie layers are used to fasten the layers of the barrier together. An advantage of using a tie layer or layers is that the active layer can be made from a polymer that does not need to be attached to the pesticide retention layer or additional layers. This allows the use of active layer polymers having low melting points. The lower processing temperatures reduce pesticide losses in the process of producing the active layer. Therefore, in view of the above, an object of this invention is to provide an insecticide barrier or zone to protect wood structures.

A further object of the present invention is to provide a barrier and an exclusion zone having a barrier of low long term volatility and a short term barrier of high volatility, to protect the adjacent land. A further objective of this invention is to maintain a barrier for relatively long periods of time or approximately 10 to 20 years. A further objective of this invention is to maintain an exclusion zone for relatively long periods of time of approximately 10 to 20 years. The present invention together with the accompanying objects and advantages will be better understood with reference to the following detailed description which is read in conjunction with the accompanying drawing. Other aspects and advantages of the present invention will be apparent to those skilled in the art upon study of this specification and the appended claims. BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 illustrates a first embodiment of the invention, comprising polymeric sheets bound or spun-bonded and a physical melt-bonded blend of polymer and insecticide, wherein the mixture of polymer and insecticides is attached in spots to the polymeric sheets. Figure 2 illustrates a second embodiment of the invention, comprising spin-linked polymer sheets and a physical melt-bonded blend of polymer and insecticide, wherein the polymer and insecticide blend is bonded in strips or strips to the polymer sheets. Figure 3 illustrates a first way of using the embodiments of the invention shown in Figures 1 and 2 in the exclusion zone created by the release of insecticide. Figure 4 uses a second way of using the first and second embodiments of the invention to create an exclusion zone. Figure 5 illustrates a third way of using the embodiments of the invention shown in Figures 1 and 2 creating an exclusion zone. Figure 6 illustrates a third embodiment of the invention in the form of a cylindrical extrusion. Figure 7 illustrates a fourth embodiment of the invention, in the form of a flat strip extrusion. Figure 8 illustrates a way to create an exclusion zone using the embodiment of the invention shown in Figure 6.

Figure 9 illustrates a way to use the embodiment of the invention shown in Figure 7 to create an exclusion zone. Figure 10 illustrates another embodiment of the invention in the form of granules, wherein the granules are inserted into the ground near a wooden structure. Figure 11 illustrates a cross-sectional view of granules placed on a surface. Figure 12 illustrates the application of granules to a concrete structure using foam. Figure 13 illustrates a cross-sectional view of a concrete foundation after foam has been applied. Figure 14 illustrates granules placed on a board. Figure 15 illustrates a board containing granules applied to a concrete foundation. Figure 16 illustrates hot melt injection. Figure 17 illustrates the spacing of the hot melt injection. Figure 18 illustrates fumigation plug of cement blocks.

Figure 19 illustrates a way to apply plugs to fumigate cement blocks. Figure 20 shows a layered device of the present invention. Figure 21 is a cross-sectional side view illustrating the layers of a multilayer barrier made according to another embodiment of the invention. Figure 22 is a perspective view of a preformed barrier made of a multilayer polymer film according to the present invention. Figure 23 is a perspective view of a pre-formed barrier made of a multilayer polymeric film according to the present invention. Figure 24 is a cross-sectional side view showing the layers of a multi-layer barrier, made according to another embodiment of the present invention. Figure 25 shows repellency of oriental subterranean termites. Figure 26 shows repellency of Formosan subterranean termites. DETAILED DESCRIPTION OF THE INVENTION It has been found that a significant reduction or elimination of insects capable of damaging wood structures can be achieved, when a barrier alone or in combination with an insecticide exclusion zone, is maintained for a long time in the ground that surrounds these structures. An exclusion zone is an area that has a sufficient amount of chemical agent to deter or prevent wildlife. In the present invention, the chemical agent is a pesticide and the fauna are insects, especially puncturing insects, for example termites and ants. According to one embodiment of the present invention, the insecticide is held in a barrier and / or is released from a controlled release device, comprising a polymer matrix system that will last for at least 6 years and often as long as 10 or more. even 30 years It has also been discovered that long-term protection against pests can be achieved by sandwiching a pesticide release layer between two substantially non-releasing layers. The substantially non-releasing layers control the release of pesticides, so that only small amounts of pesticides are released through. These small amounts of pesticide are enough to repel at least most pests and the barrier prevents pests from crossing it. The pesticide is discharged very slowly and as a result, the barrier of the present invention can be used to prevent pests from entering a protected area and / or structure for a prolonged period of time, as much as 10 or even 30 years. The use of the layers surrounding the pesticide release layer to substantially prevent the release of pesticide, allows the inner pesticide release layer to release pesticide at a rate greater than that of the barrier. This allows the active layer ie the pesticide release layer (which is made using materials and processing conditions that can not be used to produce a substantially non-releasing active layer.) The release of the pesticide release layer can also be controlled at incorporating pesticide into a polymer matrix and additionally using a carrier such as carbon black (including lamp black and gas black) As used herein the term "controlled release device" refers to a device that results in controlled release and sustained from a bioactive chemical to its surface and its surface in a surrounding medium, for example the ground.As used herein, the term "bioactive" means to stimulate an organism using in a negative way up to and including death for of a deterrent agent The term "pesticide" as used herein means and includes any a bioactive chemical that controls, repels, reduces and / or prevents pests from entering the barrier. A "pest" as used herein is intended to include any unwanted plant, animal or microorganism, such as arthropods, arachnids, triatomines, insects (such as ants, termites and other wood-boring insects) and fungi, for example. Included among particular pesticides, insecticides, herbicides, biocides, for example bactericides, fungicides, viruscides, and nematicides, and other biological control agents or administration materials. The barrier of the present invention is therefore intended to be used against all pests that succumb to their lethal and / or repellent properties. The terms "pesticidally effective amounts", "insecticidally effective amount" or "fungicidally effective amount", mean the dose of active substance sufficient to exercise the pesticidal activity., insecticide or fungicide desired. According to another aspect of the invention, the device of the present invention provides a method for controlled release of the bioactive chemical in the surrounding environment. The controlled release device releases insecticide at a high speed initially and at a slower, uniform rate, subsequently. Furthermore, the initial pesticide may be different from the one that is released for a prolonged period of time. This release profile ensures that protected areas and / or structures such as wooden objects or structures containing wood are protected in a relatively short period of time and that subsequent to reaching the minimum effective level, only the amount of insecticides needed to replace the degraded insecticide, be released. This release profile reduces potential health and environmental problems of the treatment and reduces the cost of treatment. The release rate of the device depends only on the construction of the device and the composition of the device and is independent of external elements such as water. According to another aspect of the invention, the controlled release device releases the insecticide to the soil at a desired rate to create an area that has a "minimum effective level" of insecticide, necessary to prevent insect intrusion. As used herein, the term "minimum effective level" is defined to mean the level of insecticide required in the area to prevent insects from entering the area, the specific level depends on the specific insect and the specific insecticide. When placed adjacent to a foundation or below the level of the structural portion, the exclusion zone is created in the ground near the controlled release device. When placed between a non-structural portion of wood and a structural portion of aggregate wood, the exclusion zone is created at the interface between the structural zone that is not wood and the structural portion of aggregate wood. When used commercially, the insecticides used are generally approved by a national regulatory entity, such as the US Environmental Protection Agency. (EPA = Environmental Protection Agency) or other body or equivalent regulatory entity, as suitable insecticides to exterminate or repel termites, ants and other drilling insects. The insecticides that are usually preferred for use in the present invention are pyrethrins, including tefluthrin, lambda cyhalothrin, cifluthrin, and deltamethrin. However, it will be recognized by those skilled in the art that other effective insecticides such as isofenphos, fenvalerate, cypermethrin, permethrin and natural pyrethrin may also be employed. These are available from a number of commercial sources such as The. Dow Chemical Company, Mobay, Syngenta Crop Protection, Inc., Velsicol and FMC. A combination of insecticides or one or more insecticides, in combination with other reactive ingredients such as fungicides are also in accordance with this invention. Now with reference to the drawings, a first controlled release mode of the invention as illustrated in Figure 1, utilizes a polymeric carrier device for the controlled release of insecticides to generate an exclusion zone. The embodiment comprises spin-linked polymer sheets 20 and a physical melt-bonded blend of the polymer and insecticide (shown as poles 21 of Figures 1 and 3-5). The spin-linked polymer sheet 20 may already be a woven or nonwoven fabric or it may be a polymer sheet. These textiles can also be an amount of manufacturers such as Reemay, Exxon Fibers, and Phillips Fibers. Preferably, the textile is woven or non-woven polypropylene. The polymer in the melt-bonded mixture can comprise any amount of thermoplastic polymer, thermoset polymers, polymers or elastomeric copolymers thereof. The selection of the polymers depends on the desired release rate, the compatibility of the polymer with insecticide and the environmental conditions. By way of example and is not intended to limit the scope of this invention, the following polymers may be employed: high density polyethylene, low density polyethylene, vinyl acetate, urethane, polyester, santoprene, silicone, or neoprene. However, the preferred polymers are high density and low density polyethylene. In some modalities, chlorpyrifos is the preferred pesticide although other pesticides described here can also be used. The mixture of polymer and insecticide can be placed in the polymer sheets bound by spinning in points. These points should be spaced to adequately maintain the amount of insecticide above the minimum effective level in an exclusion zone. The minimum effective level is the same amount of insecticides required in an area to avoid intrusion by insects. The dots 21 in Figures 1 to 3-5 are preferably about 0.5 to 1.5 cm in diameter, and about 0.5 to 1.5 cm in height. The size and shape of the points will depend on the user's preference and can be tailored to the work contemplated by the buyer. The dots 21 can be configured in rows with the spacing of the dots which is preferably approximately 1.5 to 4 cm from adjacent points. It will be recognized by those with skill in the specialty that other point configurations can also be used depending on the particular application. The insecticide release polymer sheets are placed near or around the wood structure to create an exclusion zone by controlled release of insecticide. A second controlled release mode of the invention also utilizes a carrier-polymeric delivery system for the controlled release of insecticide comprising polymer sheets bound by centrifugation and a physical polymer-insecticide-bound mixture. The polymer sheets 20 as in the first embodiment may already be woven or non-woven polypropylene in which the physically melt-bonded blend is joined (shown as strips 22 in Figure 2). Similarly, the polymers and insecticide described above with respect to the first embodiment can also be used in the manner described in this section. The polymer and insecticide mixture of the second embodiment can be alternately placed in spin-linked polymer sheets, using extruder systems that provide strips, for example as illustrated in Figure 2. The strips 22 can be one centimeter in height and spaced approximately 5 to 15 cm. Optimally, the fibers should be placed approximately 10 cm apart. It is convenient that the strips have to be configured this assembly to allow a concentration of steady state and insecticide in the exclusion zones after an initial burst of insecticide. After the strips are applied to the polymer sheet, the sheet is placed on or near the wooden structure to be protected from insects. Fillers and / or league carriers can also be included in all embodiments of the invention. The inclusion of the carrier and / or gauze filler allows greater amounts of insecticide for a given release or release rate or allows a lower release rate for a given amount of pesticide. The league carrier agglutinates the pesticide. League carriers that bind the pesticide include carriers based on carbon, for example carbon black (including lamp black and gas black), activated carbon and their combinations. It is considered that alumina, silicoaluminate, hydroxyapatite and their combinations can be compared with carbon to bind bioactive chemicals. When using a carrier based on carbon black, the first stage is to ensure dryness of the carbon followed by mixing the insecticide in a liquid form with the carbon. Only enough carbon black (filler) is used to produce a friable mixture. The term "friable" means substantially dry or non-sticky fluid particles. Certain pesticides may have to be heated to achieve a liquid form. The liquid insecticide adheres or binds to the extremely large surface area of the finely divided carbon black and the mixture is cooled to incorporate in the polymer. Polymers that can be used in a coal application are a polyethylene (including low and high density polyethylenes), polypropylene, copolymers or blends of polyethylene and polypropylene, polybutylene, epoxy polymers, polyamides, acrylate-styrene-acrylonitrile, aromatic or unsaturated polyesters, polyurethanes, silicones or any other suitable polymers and copolymers thereof. The carbon-insecticide mixture in the first and second embodiments (or only insecticides if carbon is not used) is then added to the polymer, preferably polyurethane, either in the molten, powder or liquid stage. Next, this mixture is linked to the polymeric sheets. In the first and second embodiments of the invention, the polymer and insecticide are melt bonded to the polymer sheets. Another way of joining the polymer and insecticide mixture with the polymeric sheets is by "injection molding". In "injection molding". In "through-injection molding", molten material is injected from a heated nozzle through a porous web and into a mold. The molten material flows through the web under pressure and solidifies in the mold. While the molten material is injected, the porous weave allows air to escape but also retains the melt under pressure until it has cooled. A different method of attaching the polymer and insecticide mixture to the polymeric sheets is by placing the molten mixture of the polymer and insecticide on the polymer sheets bound by centrifugation. If the mixture melts, it should be allowed to cool, cure and solidify. As used herein, "a molten mixture of polymer and insecticide" is meant to indicate that the polymer is already molten or is already in the liquid stage. The insecticide can also be melted or contained in a sludge solution, depending on its melting point. A "molten blend of polymer and insecticide" may also contain carbon or other additives that do not melt but flow with the molten polymer / insecticide mass. The first and second embodiments of the invention will provide sufficient release rates to maintain an effective insecticide concentration in the exclusion zone to determine or retain insects, but at sufficiently slow rates to maintain an effective concentration for a prolonged period of time. In total, a preferred composition for the first and second embodiments of the invention preferably comprises 70 to 95% by weight of carrier polymer, from about 0 to 15 parts by weight of carbon, and preferably 5 to 30 parts by weight of the pesticide . The design considerations of controlled-release devices vary according to factors such as user preferences and geographical conditions. The steady state release rate of the polymer delivery system of these two modes after the initial burst of insecticide can be maintained for at least 6 years as a barrier to insects such as ants and termites. However, the equilibrium concentration of this modality can easily be adjusted to meet the specific needs of each user. Optionally, the embodiments shown in Figures 1-5 may comprise an impermeable-insecticidal sheet (not shown) such as a metallized thin sheet. The metallized thin sheet or an extruded sheet of a polymer is laminated on one side of the spin-linked polymer sheets in order to direct the flow of insecticide. A further embodiment of the present invention is a barrier of a leaf impermeable to pests, wherein a bonded friable mixture of the bioactive chemical or pesticide with a carbon carrier is placed within a polymer and does not substantially exhibit release of the bioactive chemical. The phrases "substantially no release" and "release only minor amounts" are intended to define a release rate of less than 0.4 μg / cmVdla, preferably less than 0.1 ^ g / cm2 / day and more preferably less than 0.05 g / cm2 day. This modality encompasses a rate of release below detectable limits. In this modality, pests are dissuaded by "smelling" or "scraping" a polymer surface and detecting the presence of the bioactive chemical harmful to pests. The shelf life of the barrier is much longer than a barrier by a higher release rate. Furthermore, a failure or tear in the polymer will be less likely to "leak" the bioactive chemical. Therefore, two or more layers of this mode may be preferred to maintain a complete barrier. Multiple layers will allow a tear or hole in a layer, but a plague will not pass a second or subsequent non-tearing layer. It may also be convenient to place a protective layer such as canvas on one or both sides of a barrier layer to prevent tearing. Once elaborated, the carrier-polymeric delivery systems of the first and second modalities are placed near the structure to be protected against insects. Figures 3-5 illustrate various applications of either the embodiments of the dotted sheet or strips. The configuration of Figure 1 is illustrated in Figures 3-5, but it is understood that the configuration of Figure 2 or other configurations can work equally. In Figure 3, the carrier-polymeric delivery system 1 is placed under and along a concrete foundation 23 and a wood structure 100 creating an exclusion zone 10 to protect the structure against termites, ants or other piercing insects.

In Figure 4, the carrier-polymeric delivery system 2 is placed under a structural member 24, such as a covered terrace or porch, walker, or under a basement foundation next to the wooden structure 101, to provide an area of exclusion 10. In Figure 5, the carrier-polymeric delivery system 3 is placed on and on the sides of the concrete foundation 23 of a wood structure 102, but under the wood portion 25 of the structure to create a zone of exclusion 10. Another embodiment of the invention is illustrated in Figures 6 and 7. This embodiment refers to extrusions such as extruded flexible cylinders 26 and extruded flexible flat strips 27, which are respectively illustrated in Figure 6 and 7. Wide variety of polymers that can be classified into four broad subgroups can be used. The groups include thermoplastic polymers, thermoset polymers, polymers and elastomeric copolymers of the three aforementioned groups. By way of example, some polymers that may be employed in the four groups are high density polyethylene, low density polyethylene, ethylene vinyl acetate (EVA), vinyl acetate, urethane, polyester, santoprene, silicone, neoprene and polyisoprene. In some embodiments, the preferred insecticide is Chlorpyrifos although other insecticides described herein can be used. A fill or load can also be added. The cylinders preferably have a size in the range of about 5 to 15 mm in diameter, but more preferably about 10 mm in diameter for the supply of optimum stable state of insecticide in the exclusion zone. Flat strips preferably will have a thickness of about 1 to 6 mm and a width of 5 to 15 mm. However, it should be noted that both cylinders and flat strips can be designed to satisfy the various conditions encountered by the user. In total, in order to maintain an equilibrium concentration of pesticide in the exclusion zone for a prolonged period of time, the composition of this embodiment of the invention will comprise from about 70 to about 95 part by weight of the polymer, from about 0 to about 30 parts by weight of carbon and from about 5 to about 30 parts by weight of pesticide. The composition of the extrusion, however, can be tailored to the specific needs of the user. It is estimated that the exclusion zone can be maintained for at least 6 years for a cylinder and also for flat strips. The extrusions can be placed in a variety of positions to create exclusion zones. Figure 8 illustrates one way to use the exclusion shown in Figure 6. One or more flexible cylinders 26 are placed between the concrete foundation 23 'and the wood portion 25' in the structure. The flexible cylinders 26 release insecticide at a controlled rate to create an exclusion zone. An advantage of this configuration is that the flexible cylinders 26 can be placed under a structure that has already been constructed. Similarly, in a manner not shown, the flexible cylinders can be placed vertically in the ground in opposition to horizontally. As will be recognized by those skilled in the art, extrusions may have other convenient shapes and be placed in any suitable position, depending on the particular use contemplated. Figure 9 illustrates one way to use the flexible flat strip extrusion shown in Figure 7. One or more flexible flat strips 27 create an exclusion zone when placed between or along the concrete foundation 23"and the portion of wood 25"of the structure. The flexible flat strips 27 can also be placed vertically along a wall in a manner not illustrated in the drawings. Again, any convenient placement of the flat strips is considered within the scope of the invention. The release or controlled release of insecticide can also be conveniently achieved by using granules as illustrated in the modalities shown in Figures 10-13. The granule 13 comprises polymer, insecticide and preferably also includes a filler or filler. Various polymers can be used in this embodiment. They may comprise polymers of four sub-groups consisting of thermoplastic polymers, thermoset polymers, elastomeric polymers and their copolymers. The polymer selection of these four sub-groups depends on design considerations with the preferred polymer that is already high density polyethylene or low density polyethylene. In turn, the preferable insecticide comprises tefluthrin but the following insecticides can also be used: isofenphos, fenvalerate, cypermethrin, permethrin and other pyrethrins. For optimal results, a carrier such as carbon can be incorporated into the mixture. The granule 31 releases insecticide at a controlled rate for a prolonged period of time in order to establish an exclusion zone. The composition for this granule required for maintaining a zone in the soil is from 70 to about 95 parts by weight of the polymer, from about 0 to about 30 parts by weight of carbon black and from about 5 to about 30 parts by weight of insecticide. . Finally, the compositions of the granule depend on the preference of the user. The granules can be of any convenient size depending on the intended use such as 1 to 25 mm in diameter (or width and thickness, if rectangular) by 2 to 20 cm, or more in length. In addition, in order to adjust to the specific needs of the user, the size of the granules and the concentration of the insecticide can be easily adjusted. However, an exclusion zone can be maintained for at least 6 years. Additionally, the granules 31 have the advantage that they can be conveniently placed almost anywhere. The granules of this embodiment of the invention are illustrated in Figure 10. A granule 31 is inserted near a wooden structure 25. The granules as illustrated in Figure 10 can be placed under a cement foundation 23"'or can be placed directly under the wooden structure (not illustrated), to allow the creation of a zone 10 surrounding the wooden structure 25"'to extrude effects capable of damaging these structures Figure 11 shows a cross-sectional view of the granules 31 inserted in a surface 40. Nodules or granules easily applied to a wide variety of uses, Figure 12 illustrates sprayed granules 50 on a concrete structure surface 40. Figure 15 illustrates treating a surface by placing granules 33 on preformed boards 300. Granules 32 are applied on a surface 40 such as soil or concrete by a foam 41 as illustrated in Figure 13. The granules are first incorporated into a foam in a manner known in the art The foam 41 containing the fine granules is then sprayed 50 as illustrated on the surface 41 by a motorized sprayer 70 in, Figure 12, to provide a protective coating for the surface, the granules 32 then release the inse It is used to create a protective barrier in the ground, to protect the wood against harmful insects. For best results, the foam 50 is constituted by polyurethane. It is also possible to use silicone, polyester or polyvinyl acetate. The granules 32 can vary in size depending on the foam thickness? the desired concentration of the insecticide in the exclusion zone. The foam thickness to be applied to a surface may vary according to the user's preference. The exclusion zone can be maintained for at least 6 years. In addition to being used as an insecticide carrier, foam also heals cement and acts as an insulator. A preformed board with embedded granules 33 can also be used as an embodiment of this invention as illustrated in Figure 14. This board 300 can be made of any type of material that can conveniently hold the granules 33. Preferably, the board is constituted by styrofoam (styrene foam) which is a registered trademark of the Dow Chemical Company. The board can be applied in any variety of ways and can also work as an insulating device. One form of application is illustrated in Figure 15, where the board 300 with the granules 33 is placed on a concrete surface 42. The embedded granules are regularly separated with the spacing that is specific for the amount of insecticide designed. In another embodiment as illustrated in Figures 16 and 17, the controlled release device comprising the polymer and insecticide matrix can be applied by hot melt. This modality is designed to meet the needs of structures already in place. As stated above, the polymer matrix can comprise any of the four polymer groups mentioned above. Similarly, any of the insecticides mentioned above may be used. However, it is preferable to use high or low density polyethylene with any pyrethrin. Although they conform to the user, the concentrations of the various instances in the hot melt application should be in the range of from about 70 to about 95 for the polymer, from about 5 to about 30 for the insecticide and from about 0 to about 30 for filling / carrier, for optimal results. Figure 16 shows the hot melt 50 injected by a syringe 400 into the ground near a concrete foundation 43. The concrete structure 43 supports a wood structure 250. Figure 17 shows the spacing between the hot melt 50 which It has already been injected into the field. In another embodiment, Figures 18 and 19 illustrate the use of insecticide to fumigate a 500 structure. By injecting or placing the controlled release device in or near a structure that can be fumigated, the insecticide released from the controlled release device may evaporate., in this way fumigating the structure. Figure 18 illustrates the use of plugs 34 for fumigating a structure 500 made of building blocks 502. Similarly, Figure 19 illustrates one way of applying the controlled release device when using a drill 800 to drill a hole 700 in a plate 700. 900 cement. Once inserted, the cap is able to fumigate the structure. Another embodiment of the device of the present invention is illustrated in Figure 20. A first polymer 200 of medium or high density polymer having low vapor pressure insecticide is combined with a second low density polymer 202 having an additional insecticide. volatile, that is, higher vapor pressure. High and medium and low density are terms well known in the polymer art, referring to the degree of entanglement with a polymer. High vapor pressure is defined as pressure vapor that exceeds approximately 1 millipascal and is preferably given at approximately 10 to approximately 100 millipascales. Low vapor pressure is defined as less than 1 millipascal and is preferably in the range of about .05 to about .5 millipascales.

The first polymer of 200 preferably has a thickness in the range of about .7938 to 3.175 mm (1/32 to 1/8") .The low vapor pressure insecticide is preferably permethrin or lambda cyhalothrin. First polymer 200 is selected from polyurethane, high density polyethylene and polypropylene, Second polymer 202 is placed adjacent to and preferably connects or bonds to first polymer 200. It is preferred that polymer 200 be impermeable to water and radon. , the first polymer 200 is preferably a sheet that can be joined by spin or film In accordance with the present invention, the first polymer 200 can be in two sub-parts, with a sub-part 204 a medium density permeable polymer or high that contains the low vapor pressure insecticide and another sub-part 206 a waterproof layer that does not have insecticide.The waterproof layer has the advantage of handling to avoid or reduce exposure / contact or the installer with the bioactive chemical. The waterproof layer may subsequently be, for example, Mylar, saran or Sarana. The second polymer 202 is a low density polymer, preferably an ethylene vinyl acetate, a low density polyethylene or mixtures thereof. The most volatile or higher vapor pressure insecticide placed within the second polymer, preferably is a synthetic pyrethroid, for example tefluthrin. The second polymer 202 may be in the form of granules as previously described and the first and second polymers deployed with the first polymer under a support plate in a foundation and the second polymer dispersed in the soil adjacent to the foundation. More preferably, the second polymer 202 is in the form of an open mesh, either woven or non-woven, as illustrated. Mesh openings may be in the range from contact, but not sealed to approximately 6.45 to 25.8 era2 (1 to 4 in2) and the ribs 208 that have a cross sectional width from about .0254 to 3.175 mm (1 thousand to about 1 / 8") A canvas that can be made of polyethylene, polypropylene or polyester, can be used as the mesh With a first polymer sheet 200 and a second open polymer mesh 202, the device of the combination of the first and second polymers 200 , 202 is preferably placed below the level The first polymer sheet 200 is placed adjacent to the open mesh of the second polymer 202, with the sheet of the first polymer 200 in contact or near a foundation 43 and between the foundation and the open mesh of the second polymer 202. The mesh material can absorb bioactive chemical and contribute to the deposit of bioactive material In operation, the first polymer 200 maintains a physical barrier / uímica against intrusion of insects. However, due to the slow release of the first polymer 200, very little insecticide is released that would be available to create an exclusion zone in about one year after installation. In addition, it is impossible to install a barrier free of defects due to penetrations, for example electrical and plumbing, due to perforations or tearing during construction. Accordingly, the second polymer 202 is deployed to create exclusion zones within a few days of installation, thereby preventing insect access through the imperfections of the first polymer 200. The first polymer 200 therefore has three Functions: insect barrier, vapor / moisture barrier and radon barrier. The first polymer 210 is designed to last at least 10 years and preferably up to and exceeding 20 years. The second polymer 202 is designed to last at least 5 years and preferably up to about 10 years. At the time when the second polymer 202 is depleted and no longer effective against insects, the first polymer 200 will have to develop a concentration of insecticide released enough to maintain the exclusion zone. The Preferred Multiple Layer Barrier. Still another embodiment of the present invention is a multilayer barrier that includes at least three layers. One layer of pesticide release and two layers of pesticide retention. The pesticide retention layers are on either side of a pesticide release layer. The pesticide release layer (ie the layer containing pesticidal active ingredient or "active") contains at least one pesticide. The pesticide release layer releases the pesticide at least, The pesticide retention layers allow only a minor amount of pesticide to be released from the barrier. The active inner layer is sandwiched between the two pesticide retention layers, so that substantially no pesticide is released from the barrier. The thickness of the barrier in general is in the range of about .254 to .762 nm (.010"(10 mils) to about .03 (30" mils)) and preferably about .355 to .40 mm (.014). "(14 mils) to approximately .016" (16 mils)). The multi-layer barrier can be formed into a sheet or film and placed to encircle areas such as foundations for homes that need to be protected with crawling insects such as termites and other pests. This multi-layered barrier protects areas and / or structures by preventing pests such as wood-piercing insects, crawlers and termites from entering protected areas and / or structures and by repelling and / or preventing pests from crossing the barrier. The multi-layer barrier protects areas and / or structures for a prolonged period of time, while avoiding harmful effects on the installers of the barrier, people who visit or occupy protected areas and / or structures and the environment. The release of the pesticide from the barrier is minimal so that the barrier can be handled by installers without adverse consequences. The minimum release of the pesticide provides minimal impact on the environment and allows the barrier to last for a prolonged period of time, usually up to 10 or even 30 years. The multi-layered barrier can be installed below the foundations of buildings before construction, in order to offer the owners of the new construction a long-term protection against pests such as termites and wood-piercing, crawling insects. In addition, to keep pests out of protected areas and / or structure, the multi-layer barrier helps prevent harmful gases such as radon from entering the protected area and / or structure. The barrier of this embodiment of the invention may include one or more additional layers. The additional layer (s) can be placed at any desired site with respect to the pesticide release layer and the pesticide retention layers, but an additional layer is preferably placed between the pesticide release layer and the pesticide retention layer. . The barrier of this embodiment of the invention may include an additional layer or layers that add mechanical strength and puncture resistance to the barrier. This additional layer or layer may be placed at any desired location with respect to the required layers but an additional layer is preferably placed between the pesticide release layer and the pesticide retention layer. The multi-layer barrier may be in the form of a sheet or thin film that includes at least one layer that provides mechanical strength and puncture resistance to the sheet or film. The thickness of the puncture resistance and mechanical strength layer is generally in the range from about .0508 to .1524 mm (.002"(2 mils) to about .006" (6 mils) preferably about .1016 mm (.004"(4 mils)).

The barrier of this embodiment of the invention may also include one or more additional protective layers to protect the barrier against environmental factors such as ultraviolet rays. The additional protective layer (s) protect the UV barrier during installation and when the barrier is exposed to sunlight later. The additional protective layer (s) can be placed anywhere with respect to the other layers, but in general they are placed outside the other layers of the barrier. The protective layer (s) can be made of heat-sealable polymers to facilitate the thermal sealing capability of the barrier. The thickness of the protective layers and in general are in the range from about .00127 to .0762 mm (.0005"(.5 mils) to about .003" (3 mils) preferably about .0254 mm (.001") (1 mil) .Protective layers generally range from about 15% by weight to about 30% by weight of the barrier, preferably about 22% by weight of the barrier.The area densities of the protective layers , in general they are in the range of approximately 13 grams of material per square meter to approximately 78 grams of material per square meter, preferably approximately 26 grams of material per square weight.The layers of the barrier are held together or glued together to forming a unitary multilayer product The layers can be bonded together either directly or through the use of tie layers.For example, a layer of mechanical strength and puncture resistance can be attached to the active layer (it is remove the pesticide release layer) and the pesticide retention layer (s) using a tie layer.

Similarly, the mechanical strength layer and puncture resistance can be attached to the pesticide release layer using a tie layer. One advantage of using one or more tie layers to secure the layers of the barrier together is that the active layer can be made from a polymer that does not require binding to the pesticide retention layer or additional layers. This allows use of polymers in the active layer (i.e. the pesticide release layer) that have low melting points. The lower processing temperatures reduce pesticide loss in the process of making the active layer. The pesticide retention layers are preferably made of a polymeric material that only allows small amounts of the pesticide to pass such that substantially no pesticide is released from the barrier. The preferred polymer is Saranex ™ available from the Dow Chemical Company of Midland, Michigan. The thickness of each pesticide retention layer in general is in the range of about .0254 to .0127 mm (.001"(1 mil) to .005" (5 mils) preferably about .0508 mm (.002"). (2 mils).) These pesticide retention layers are generally in the range of about 20% by weight to about 40% of the barrier, preferably about 25% to about 35% by weight of the barrier, more preferably about 30% by weight of the barrier The area densities of the pesticide retention layers are generally in the range of about 26 grams of material per square meter to about 130 grams of material per square meter, preferably about 60 grams per square meter. grams of material per square meter In this embodiment of the present invention, the pesticide retention layer (s), in place of the pesticide release layer, controls the release of the pesticide from the barrier. The release of the pesticide can help ensure that only small amounts of the pesticide are released by controlling the release of the pesticide from the pesticide release layers. The rate of release of the barrier may in some cases be lower than the detectable limits. The pesticide release layer can be made from a polymer matrix and a pesticide that is dispersed through the polymer matrix. The polymeric matrix can be a controlled release polymer matrix, which is formed in a movie. In one embodiment of the present invention, the polymer matrix is made of low density polyethylene. Linear low density polyethylene is currently preferred as the polymer matrix material because it has lower melting point than other polyethylenes. The low density polyethylene can be a low density polyethylene catalyzed by raetalocene. Other suitable polymers for use in the polymeric matrix include but are not limited to, urethane, polyurethane, epoxy, silicone, polyethylene plus wax (PE + wax), aromatic polyesters, pellethane, ethylene vinyl acetate (EVA), polyethylene, high polyethylene. density, low density polyethylene, vinyl acetate, polyester, santoprene, neoprene, polyisoprene, polypropylene, copolymers or blends of polyethylene and polypropylene, polybutylene, epoxy polymers, polyamides, acrylate-styrene-acrylonitrile, unsaturated polyesters, silicones and combinations thereof. The polymer for use in the polymer matrix can be hydrophobic. Examples of pesticides suitable for use in the pesticide release layer include, but are not limited to pyrethroids, neonicotinoids, isophenphos, fenvalerate, pyrethrins, and combinations of these types of compounds. Preferred pesticides for use in the pesticide release layer include tefluthrin, pexmethrin, lambda cyhalothrin, resmethrin, amethrin, cypermethrin, cyphenothxin, cyfluthrin, deltamethrin, chlorpyrifos, phenoxycarb, diazinon, dichlorophen, methyl isothiocyanate, pentachlorophenol, tralomethrin, chlorfenapyr, fipronil, neonicotinoids and their combinations of these compounds. Examples of suitable neonicotinoids include, but are not limited to thiamethoxam, nitenpyram, imidacloprid, clothianidin, acetamiprid, and thiacloprid. A preferred pesticide for use in the pesticide release layer is lambda cyhalothrin. Lambda cyhalothrin is a highly potent termiticide with a lethal concentration that exterminates 99 percent of the test termites (LC99) of 0.0001 ¿g / termite for the termite species of the US. most important, Reticulitermes flavipes. In some modalities, less one of the pesticides in the pesticide release layer is present in an amount of at least 5% of the pesticide release layer, by weight. In other embodiments, at least one of the pesticides in the pesticide release layer is present in an amount of at least 10% of the pesticide release layer by weight. The multi-layer barrier provides several modes of action against termites. The multi-layer barrier provides lethal insecticide protection by using pesticide such as lambda cyhalothrin from the barrier to deliver a lethal dose of pesticide that can be transferred to termites after transient contact with the barrier. The multi-layer barrier also provides repellent protection against termites. The multilayer barrier also provides physical protection against termites because the barrier preferably has external pesticide retention layers, which are smooth or uniform or resistant so that termites can not initiate their feeding into the barrier. The pesticide release layer that is made from a polymeric matrix and a pesticide dispersed through the matrix may also include a carrier such as carbon black (including lamp black and gas black). Black carbon in the form of black lamp has been found to provide an advantage of not deactivating or decomposing the pesticide, it is easier to extrude and easier to prevent it from agglomerating. The use of carbon black in the form of lamp black helps to produce a friable mixture of substantially dry or non-sticky fluid particles and to avoid evaporation of the pesticide during extrusion. The thickness of the pesticide release layer in general is in the range of about .254 to .508 mm (about .01"(1 mil)) to 0.020" (20 mils), preferably about .0254 a. 0127 mm (approximately 0.001"(1 mil) to 0.005" (5 mils), more preferably approximately .0508 to .0094 mm (approximately 0.002"(2 mil) to 0.0037" (3.7 mils)). pesticide in general is in the range of about 15% by weight to about 30% by weight of the barrier, preferably from about 22% by weight to about 25% by weight of the barrier, more preferably about 24% by weight of the barrier. The barrier The area density of the pesticide release layer is generally in the range of about 22 grams of material per square meter to about 115 grams of material per square meter, preferably about 45 grams of material per square meter .

The pesticide release layer, preferably releases the pesticide in a controlled manner. This controlled release assists the pesticide retention layer by releasing only small amounts of the pesticide from the barrier to assist in achieving a substantially non-releasing barrier. In other words, the release of only small amounts of the pesticide from the barrier can be helped by controlling release of the active layer (i.e. the pesticide release layer). In addition to pesticides that repel and prevent penetration by insects, it may be convenient to include one or more fungicides in the barrier. The fungicide (s) may be included in the pesticide release layer containing an insecticide or in a separate fungicide release layer. The separate fungicide release layer can be located within the pesticide retention layers. One or more fungicides may be included to avoid deterioration of the integrity of the fungal barrier. The term "fungicide" as used herein is intended to cover compounds reactive against phytopathogenic fungi that may belong to a very broad range of compound classes. Examples of classes of compounds to which the convenient fungicidally active compound may belong include both liquid fungicides at room temperature and solids at room temperature (25 ° C), including but not limited to triazole derivatives, strobilurins, carbamates (including thio and dithiocarbamates), benzimidazoles (such as thiabendazoles), N-trihalomethylthio compounds (such as captan), substituted benzenes, carboxamides, phenylamides, phenylpyrroles, and mixtures thereof. Suitable fungicides also include trichloronitromethane, a mixture of methylisothiocyanate and 1,3-dichloropropane, sodium N-methyl dithiocarbonate, 2,3,5,6-tetrachloro-l, 9-benzoquinone, calcium cyanamide, biphenyl, copper naphthenate, dichlorophene, fentin hydroxide, and combinations of these compounds. The fungicidally active compound or compounds are used in a fungicidally effective amount in the active layer of the multilayer barrier. Mixture of one or more of the above active chemical compounds are also usable as an active component in the practice of the present invention. When the barrier of this embodiment of the invention includes one or more layers of puncture resistance and mechanical strength, the layer or layers of mechanical strength and puncture resistance are preferably made of canvas. The layer or layers of mechanical strength and puncture resistance help to prevent tearing and perforations and provide tensile strength of the barrier. The preferred canvas is made of a woven polymer. Especially preferred are woven polymers made of high density polyethylene. The overall canvas thickness is in the range of about .0508 to .1524 mm (0.002"(2 mil) to about 0.006" (6 mils), preferably about .1016 mm (0.004"(4 mils)) The overall canvas layer is in the range of about 11% by weight to about 24% by weight of the barrier, preferably about 17% by weight to about 18% by weight of the barrier. Overall canvas layer is in the range of approximately 30 grams of material per square meter to approximately 95 grams of material per square meter, preferably approximately 62 grams of material per square meter.To reduce the release of pesticides from the release layer of pesticide on the edges of the barrier, the pesticide retention layers can be made wider and longer than the corresponding pesticide release layer (s) and the pesticide retention layers can advantageously be rse between each other either directly or by a tie layer.

Placing one or more additional layers (i.e. layers other than the pesticide release layer) within the pesticide retention layers offers an advantage that the barrier becomes penetrated by a pest. As the pesticide is released, the additional layer or layers are impregnated with the pesticide. Accordingly, the additional layer or layers offer additional physical and pesticidal protection against pests passing through the barrier. One advantage of the multilayer barrier according to this embodiment of the present invention is that the barrier can prevent termites, wood-piercing ants, and other pests from entering a structure constructed wholly or in part from wood. Another advantage is that the barrier can prevent pests from crossing it for a long time, as long as 10 or even 30 years. Still another advantage is that the outer surfaces of the barrier are substantially free of pesticide when the barrier is installed. This leads to increased security for those who handle them and install the barrier. A still further advantage of this embodiment of the invention is that the barrier manufacturing process is efficient, and the barrier can be produced in large quantities using conventional commercially available equipment.

In addition to keeping the pest out of a protected area and / or structure, the barrier according to this embodiment of the present invention prevents moisture and noxious gases from entering the protected area and / or structure. According to one aspect of the invention, the barrier comprises a plurality of polymeric layers that are joined together to form a thin flexible film. The film can be placed in surrounding areas such as foundations for houses that need to be protected against crawling insects such as termites and other pests. The presently preferred multilayer barrier of the present invention is composed of a polymeric film of eight thin layers. The layers are joined together to form a flexible film. The thickness of the currently preferred barrier film is in the range of about .381 to .40 mm (about .015"(15 mils) to .016" (16 mils). The width of the currently preferred barrier film is in the range of about 205.7 cm (81") to about 210.8 cm (86"). The weight of the currently preferred barrier film is approximately 327 grams per square meter. The 8 layers of the presently preferred film are schematically illustrated in cross section in Figure 21. Now with reference to Figure 21, a barrier film 110 includes outer layers 112 and 114. The outer layers 112, 114 are made from mixtures of a polyolefin plastomer grade extrusion coating (sold under the trade name and Affinity model number * 411 PT1450 by Dow Chemical Company), a color concentrate (a mixture produced from Colortech Inc. of Brampton, Ontario, Canada from the black of carbon VulcanMR 9 manufactured by the Cabot Corporation and LDPE), and polyethylene grade extrusion coating (NovapolMR LC-0522-A available from Nova Chemicals Canada Ltd.). The materials used to produce the outer layers 112, 144 are also referred to below as the "New Generation Resin" or "NGR" (New Generation Resin). The materials used to make the outer layers 112, 114 help provide ultraviolet protection and thermal sealing to the barrier. The melting point of the outer layers 112, 114 is approximately 110 ° C. The expectation or life expectancy of the outer layers 112, 114 is expected to be comparable with the moisture barriers currently employed during construction and the material is expected to last indefinitely when applied underground. The outer layers 112, 114 have thicknesses of approximately .0279 mm (.0011"(11 mils)) and have approximately 26 grams of the material per square meter in the preferred embodiment.Within the outer layers 112, 114 are the retaining layers. of pesticides 116, 118. Pesticide retention plates 116, 118 are made from Saranex ™ 14, a product of Dow Chemical Company, Saranex 14 has a melting point above 143 ° C and is not considered to be biodegradable or photodegradable.

Saranex "" 14 is a five-layer co-extruded product consisting of low density polyethylene, vinylidene chloride / vinyl chloride copolymer (ie, Saran), ethylene / vinyl acetate copolymer and silicon dioxide. The processed layers of Saranex ™ 14 (ie, layers 116 and 118) have a thickness of approximately .0508 mm (0.002"(2 mils)) and have area densities of approximately 53 grams of material per square meter in the preferred embodiment Within the pesticide retention layer 116, there is a tie layer 120 which bonds the pesticide retention layer 116 with a layer of canvas 122. The tie layer 120 is made of the same material as the retention layers of the same. pesticide 112. 114. The tie layer 120 has a thickness of about 0.002"(11 mils) and an area density of about 26 grams of LDPE per square meter in the preferred embodiment. The canvas layer 122 is made of high density polyethylene, specifically Sclair ™ HDPE No. 99G avble from Nova Chemicals Corporation. The canvas layer is preferably a woven HDPE. The HDPE used to produce the canvas layer 122 is extruded into a sheet and cut into tapes. The tapes are then prestressed and woven into a sheet, which is incorporated in the barrier film 110, to provide tensile strength and puncture resistance. The HDPE used to produce the canvas layer 122 is very similar to the resin used to produce common water pipe and which is expected to have a comparable service life. The canvas layer 122 has an approximate thickness of .1016 mm (.004"(4 mils)) and an area density of approximately 63 grams of material per square meter in the preferred embodiment. Canvas 122 to an active layer 128. The bonding layer 126 is a low density polyethylene grade extrusion coating avble from Nova Chemicals Canada Ltd such as NovapolMR LC-0522-A. The bonding layer 126 has a melting point of about 165 ° C. The tie layer 126 has a thickness of about 0.0254 mm (.001"(1 mil)) and an area density of about 25 grams of material per square meter in the preferred embodiment. Between the tie layer 126 and the pesticide retention layer 118 is the active layer 128. In some embodiments of the invention, the active layer 128 is made from about 0.82% by weight to about 1% by weight of lambda cyhalothrin technique ( 85% p / p) / about 0.85% in. weight up to about 1.05% by weight of carbon black, Lamp black # 6 (which is also known as Lamp black Superfine # 6) avble from General Coal Company, and from about 20.9% by weight to about 23.1% by weight of polyethylene resin Low density (LDPE = low density polyethylene). In another embodiment, the active layer 128 is made up of lambda cyhalothrin 11.74 weight percent in a technical solution 85.2 weight percent, Lamp black # 6 10.87 weight percent, and low density polyethylene resin (LDPE) 77.39 percent in weigh. The LDPE resin is preferably PE XU59400.00 (which is also known as PE XU59400) avble from the Dow Chemical Company, a LDPE with metallocene-catalyzed extrusion coating degree. This particular LDPE is chosen because of its low melting point of approximately 60 ° C and its extrusion coating capacity. The active layer 128 is approximately 23% of the barrier film 110, has a thickness of approximately .0508 mm (.002"(2 mils)) and an area density of approximately 45 g of material per square meter in a preferred embodiment. In the eight layer barrier film described above, the outer layers 112 and 114 and the joint layer 120 together comprise from about 22.2% by weight of the barrier film 110. The pesticide retention layers 116, 118 as a whole comprise approximately 29.7% of the barrier film 110. The canvas layer 122 comprises approximately 17.8% by weight of the barrier film 110. The tie layer 126 comprises approximately 6.4% by weight of the barrier film 110. The active layer 128 is approximately 23.9% by weight of the barrier film 110. The rate of release of bioactive chemicals from the tie layer 126 to the other layers is greater than the rate of release of bioactive chemicals from the barrier film 110 to the outside of the barrier film 110. The release rates of lambda cyhalothrin in the eight mode preferred layers, were measured to be less than 0.002 g per square centimeter of film per day. The barrier film 110 serves to prevent the entry of organisms that deteriorate the wood in a structure, while resulting in a negligible concentration of lambda, cyhalothrin in the soil and other neighborhoods. Another convenient multilayer barrier can be composed of a thin 6-layer polymer film, wherein the layers are joined together to form a flexible film. In one embodiment, the thickness of the six-layer polymer film is approximately .3048 mm (.012"(12 mils)), the width is in the range from approximately 205.7 cm (81") to approximately 210.8 cm (83") ) and the weight is approximately 263 grams per square meter The layers of a suitable six layer film are schematically illustrated in cross section in Figure 24 and are described below Now with reference to Figure 24 a barrier film 210 includes outer layers 212, 214. The barrier film 210 serves to prevent entry of organisms that deteriorate the wood in a structure while resulting in a negligible concentration of lambda cyhalothrin in the soil and other neighborhoods. , 214 are made from mixtures of a polyolefin plastomer grade extrusion coating, a color concentrate, and polyethylene grade extrusion coating as described above subsequently with respect to the eight-layer film and referred to as the "new generation resin" or "NGR". The outer layers 212, 214 may have a thickness in the range of about .00127 to .0762 mm (.0005"(0.5 mil) to .003" (3 mils) and have in about 13 grams to 78 grams of material per square meter . Within the outer layers 212, 214 are the pesticide retention layers 216, 218. In one embodiment, the pesticide retention layers 216, 218 are made from Saranex ™ 14 as described above. Layers 216 and 218 can have a thickness in the range of about .00127 to .0762 mm (.0005"(0.5 mil) to .003" (3 mils)) and have from about 26 grams to 130 grams of material per meter square . Within the pesticide retention layer 216, is the structural layer 222. In one embodiment, the structural layer 222 is made from HDPE as described above. The structural layer 216 may have a thickness in the range of about .0508 to .1524 mm (.002"(2 mils) to .006" (6 mils) and may have from about 31 grams to 93 grams of material per meter. square.

The structural layer 222 enters and the pesticide retention layer 218 is the active layer 228. In one embodiment, the active layer 216 is made up of 0.91% by weight of lambdas cyhalothrin in a technical solution of 85% by weight lamp black # 6 at 0.95% by weight and LDPE resin 22% by weight. The active layer 216 can have a thickness in a range of about .0508 to .0127 rain (.002"(2 mils) to .005" (5 mils) and can have from about 22 grams to 115 grams of material per square meter The release rate of lambda cyhalothrin in the six layer mode was measured to be less than 0.002 μ per square centimeter of film per day.The barrier film 210 serves to prevent the entry of organisms that deteriorate the wood in a structure while results in a negligible concentration of lambda cyhalothrin in the soil and other neighborhoods.The present invention also provides efficient methods for making the multilayer barrier, using conventional commercially available equipment.According to one aspect of the present invention, lamp black or Black gas is used in a pre-mix to make the active layer.The lamp black achieves the desired fluidity of the pre-mix but unlike a As for other types of carbon black, the lamp black has no harmful effects on the activity of the pesticide such as deactivating the pesticide. Method for Producing the Barrier Film The multilayer barrier film described above can be formed by a variety of methods. In one method the carrier such as carbon black is mixed with particles of a polymer to form a mixture. One or more pesticides are added in liquid form to the mixture while maintaining the mixture at a temperature below which the pesticide decomposes but above the melting point of the pesticide to form a friable pre-mix. The pre-mix is extruded by melting to form a thin active layer. The pre-mix is extruded together with the additional layer or layers desired to form a barrier film. The desired number of layers, the type of selected layers, the order of the layers and the materials used to produce the layers depend on a variety of factors including but not limited to the final application of the barrier film, the desired length of protection against pest intrusion, the type of area and / or structure to be protected, the types of specific pests, costs and manufacturing capabilities and the like.

The active layer can be prepared by combining the pesticide or bioactive chemical with the carrier, to form a bonded friable mixture and adding the friable mixture bound to the polymer matrix. The active layer can also be prepared by mixing the polymer and the carrier to form the polymer-carrier mixture followed by the addition of the pesticide or bioactive chemical. The eight layer barrier film 110 described above can be formed by the following preferred method. To produce the active layer 128, the polyethylene resin and carbon black in the form of lamp black are combined and mixed. A convenient mixer is a Marion type mixer. A Marion type mixer is used, the mixer is sealed and an agitator is activated.

The polyethylene resin and carbon black are mixed until they mix well and the carbon black agglomeration is reduced in size. The polyethylene resin is preferably in the form of granules and is cryogenically ground to a 35 mesh powder. The volumetric or bulk temperature of the mixture is preferably kept below 60 ° C. Next, lambda cyhalothrin is gradually added as a molten spray while mixing polyethylene-carbon black resin is maintained. In the preferred embodiment, a 85.2% by weight technical grade solution of lambda cyhalothrin is employed. The mixing is continued until a content is uniformly mixed. The mixture can then be stored, for example in drums lined with plastic. The mixture is then granulated or pelletized by feeding into an extruder / granulator adapted with a matrix. In the preferred embodiment, an extruder / granulator adapted with a strand die of 3,175 mm (1/8") is used and the temperature of the extruder is maintained at about 85 ° C over the length of the extruder barrel and die. The extruder may require cooling with water before granulating.The granules are made approximately 3,175 mm (1/8") long in the preferred embodiment. The granules are then dried. The granules are dried in a hot air cyclone dryer or, if necessary to achieve more complete drying, placed in flat trays and put in a forced air oven at 60 ° C to dry. The premix of granules is extruded and laminated between two multilayer films by a rolling process. Specifically, the pre-mix granules are extruded and laminated between multilayer films designed to hold the bioactive material within a final barrier film 110. A conventional extruder such as a single screw extruder or double spindle can be used to extrude the layer 128. The two multilayer films employed in the lamination step are pre-fabricated. The first multilayer film comprises the layers 114, 118 described above (ie the pesticide retention layer made from Saranex ™ 14 and the adjacent NGR layer). The second multilayer film comprises the layers 112, 116, 120, 122, 126, 114 and 118 described above (ie the NGR layer, the adjacent pesticide retention layer made from Saranex ™ 14, the adjacent NGR layer, the layer of adjacent HDPE and adjacent LDPE chart). The layers of the second multilayer film are oriented such that the first NGR layer (i.e. the layer 112) is on the outer surface of the final product. The pre-mix granules are diluted with polyethylene-biogenta resin to a desired lambda cyhalot rin configuration and fed to an extruder to be laminated directly from the first and second multilayer film to form barrier film 110. The concentration of lambda cyhalothrin of barrier film 110 is 0.77% by weight or 2.75 grams per square meter of barrier film 110 in the required method. The barrier film 110 is then rolled into bolts and packaged for sale or supply for sizing and sewing. The moisture in the pre-mix, particularly for the carbon black, can cause manufacturing problems such as bubbling in the active layer 128, as that layer leaves an extruder matrix. This can be solved by drying the pre-mix in an incubator set at about 54 ° C for a period of approximately 12 hours, which has been found to substantially dry the pre-mix, so that bubbling does not occur. Care should also be taken to reduce atmospheric moisture contact with the pre-mix concentrate. In addition, carbon agglomerates can form a highly textured surface in the barrier film 110. Carbon agglomeration is a problem because this results in heterogeneous distribution of the bioactive ingredients (lambda cyhalothrin for example) in the active layer 128. This problem can be reduced by sifting the black carbon component of the canvas layer 122 through a 100 mesh screen, before use. Proper carbon black dispersion can also be achieved through the use of high energy mixers such as Henschel type mixers and twin screw extruders, or the use of master batches with which high carbon loading is used to increase the melt viscosity of polymer, thereby increasing the shear stress in an extruder to result in carbon dispersion. A lower extruder temperature or the use of an extruder screw having a high shear mixing section can also effect better coal distribution. An example of an extruder spindle having a shear mixing section is a screw design having a grooved barrier passage constructed in the spindle. When this spindle is used, the polymer melt is forced to flow over the barrier passage, which is near an extruder barrel. This subject to polymer melting at a high shear rate and thus increases the extrusion of carbon through the mixture. Decomposition and volatilization of lambda cyhalothrin occur in the manufacturing process at temperatures from about 160 ° C, with a point of change between about 160 ° C and about 170 ° C where losses of lambda cyhalothrin become significant. To have a safety cushion for operating conditions, it is beneficial to have a processing temperature of approximately 150 ° C. Preferred Method of Out-of-Site Preforming Barrier movie.

The currently preferred use of the barrier film is in protecting houses against invasion by termites and other crawling insects that perforate the wood. In order to prevent insects from entering houses through the land, the barrier film of the present invention should be placed between the ground and the foundation of the house in contact with and in the vicinity of the land. It is currently preferred to make the barrier film of the present invention, commercially in sheets that are smaller than the foundation of a house. Accordingly, it is necessary to combine a number of sheets to line the foundation with the barrier film. In order to avoid gaps between adjacent sheets, the sheets may be sealed, joined or otherwise connected together. According to another aspect of the present invention, the barrier film is pre-configured or pre-formed off-site, to be adjusted in its intended location before placing the barrier film in its intended location such as in the excavation for the foundation of a house . It is beneficial to combine the leaves of the barrier material to form a pre-shaped barrier that will wrap the entire foundation of an off-site house and then transport it and install it in the excavation for the foundation. The combination of leaves out of site in the form of the foundation reduces the chances of the leaves being torn or inadequately sealed together to leave gaps. Figure 22 shows a pre-formed barrier made of multilayer polymeric film. The pre-formed barrier can be constituted by sealing various segments of the barrier. Preferably, the thermoplastic sheets used to seal the various segments of the barrier are the outer layers of the multilayer barrier. However, the segments of the barrier can be formed into desired sheets using any other means including superimposing segments of thermoplastic materials on the adjacent wooden sheets. The segments for example may be in the form of patches or strips of thermoplastic material .. Figure 23 shows an excavation for a foundation, adapted to receive the pre-shaped barrier of Figure 22. In a modality of the barrier film that has a load of 2.75 μg of lambda cyhalothrin per mm2, each mm2 of the barrier film contains enough lambda cyhalothrin to kill at least 24,000 individuals of R. flavipes. The resistance to termites and other pests that perforate the wood, is conserved by the barrier film even in the case of holes or tears in the barrier film. For example, with holes or tears that have a size of 2 mm or less, R.

Flavipes contacts the active ingredient exposed as they pass through the hole resulting in high mortality of termites. Not every embodiment of the present invention provides all the named advantages. Still further, additional advantages of the present invention will be apparent upon study of this specification. EXAMPLES The following examples are provided by way of explanation and to further illustrate the various aspects of the present invention. As such, these examples are provided for illustrative purposes only and are not seen as limiting the scope of the invention in any way. EXAMPLE 1 Experiments were performed to determine the release rate of chlorpyrifos. The loading rates for the insecticide were already 5% by weight (percent by weight) or 10% by weight depending on the polymer. Release rates were determined for all devices at 50 ° C. The polymers evaluated include low melting polyethylene, polyurethane, two epoxies, silicone rubber, low melting point polyethylene with high wax content to reduce thermal decomposition of chlorpyrifos. Studies indicated that excessive thermal decomposition of chlorpyrifos occurred at temperatures exceeding approximately 240 ° C; in this way, polymer selection was restricted to formulations that do not require excessive thermal processing. Table 1 provides a summary of the results of these studies. In total, the compatibility of polymer with chlorpyrifos does not seem to present a problem with the loading speeds used. There was some loss of physical integrity of the polyurethane polymer used, however the other polymer systems did not exhibit visible degradation at 50 ° C. Release rates were in the range of 10 ¿g / cm / day for the silicone rubber at 0.3 / g / cm2 / day for Epoxy B. Using the data provided in Table 1, an estimated product longevity can be approximate. Considering a device weight of 0.5 g, with 10% loading, then 50 mg of chlorpyrifos are available for release. Thus, for a polymer system having an area of 4 cm 2, and a release rate of 1 g / cm 2 / day, there is enough insecticide to last 30 years at elevated temperature.

These calculations indicate that a variety of insecticide products are possible. TABLE 1 Polymer Formulations and Release Rates for Candidate Systems Employing Chloropyriphos a Release velocities performed at 50 ° C. b Excessive exhibited material high temperature cracking EXAMPLE 2 Studies were also performed with similar polymer systems as in EXAMPLE 1 but with 80% pure pyrethrin. Release rates at 40 ° C are given in Table 2. TABLE 2 Polymer Formulations and Release Rates for Candidate Systems Employing Pyrethrin 1 a Release velocities were performed at 40 ° C. The release rates were the highest for urethane and silicone and the lowest for epoxies. Substantial variability in release rates were found and appropriate binders were required to be evaluated. From the data in Table 2, simple calculations can be performed to determine the possible shelf life of the insecticide systems. As established in the EXAMPLE 1, there are many variables that can alter the useful life of an exclusion zone. EXAMPLE 3 Controlled release devices were developed and tested to obtain their release rates. All thermoplastic polymers were formulated with 10 percent pesticide, 3 or 7 percent carbon black to absorb pesticide from liquid, and 83 to 87 percent by weight of polymer and injection molded into thin sheets with thickness of approximately 3.175 mm (1/8 inch). Specifically, devices made from thermoplastic polymers and deltamethrin and lambda cyhalothrin contain 3 percent carbon black. The devices made from the remaining pesticides and thermoplastic polymers contain 7 percent carbon black. Devices made from S-113 urethane (a thermoset polymer) are made from a blend of polymer containing 60% S-113, 40% castor oil and 5% TIPA catalyst by weight. The polymer mixture comprises 90% by total weight of the device. The pesticide, deltamethrin, comprises the remaining 10% of the device. No carbon black was used in this device. The polymer / pesticide mixture was emptied into a 3,175 mm (1/8 inch) thick sheet and heated to about 60 ° C for about 40 to 60 minutes to cure the cast or cast sheet. Frames of 2.54 mm (one inch) were then cut from the thin sheets that were injection molded or emptied and the frames were tested for release rates. The following release speeds are obtained: TABLE 3 Pesticide Polymer Release Speed Deltamethrin urethane S-113 25.2 ^ g / cmz / day Aromatic 80A 16.8 / g / cm2 / day Pellethane 2102-80A 8.8 ^ g / cm2 / day Pellethane 2102-55D 8.0 ¿ig / cm Day Alipmtic PS-49-100 7.2, ug / cm2 / day Cypermethrin Polyurethane 3100 0.4 μg / cm2 / day Polyurethane 2200 0.7 μg / cm2 / day EVA 763 27.3 ^ g / cm2 / day Polyethylene MA 778 · -000 4.6 ^ g / cm2 / day Lambda cyhalothr Polyurethane 3100 0.4 g / cm2 / day Polyurethane 2200 0.7 g / cm2 / day EVA 763 27.3 g / cm2 / day Polyethylene NIA 778-000 4.6 g / cm2 / day Tefluthrin Polyurethane 3100 6.4 μg / cm / day Polyurethane 2200 25.0 g / cm2 / d EVA 763 40.4 gg / cm2 / d at Polyethylene MA 778-000 27.0 g / cm / day Permethrin Polyurethane 3100 1.4 μg / cm2 / day Polyurethano 2200 1.3 g cm2 / day EVA 763 28.5 μg / cm2 / dxa Polyethylene MA 778-000 4.0 μg / Cm2 / day EXAMPLE 4 An experiment was carried out to determine the effect of lambda cyhalothrin concentration (pyrethroid) and insecticide / polymer combination in the insecticide release rate of the polymer. The data is summarized in the Table. TABLE 4 Release Rate for Polymer / Pyrethroid Concentration Combinations Polymer Concentration Pyrethroid Velocity Pyrethroid Release (% by weight) (mg / cm2 / day) Ethylvinyl Acetate (EVA) 1 0.3 5 2.2 10 2.5 Polyurethane 1 0.9 5 4.4 10 8.3 Polyurethane / EVA (50/50) 1 2.6 5 7.2 10 9.1 EXAMPLE 5 An experiment was carried out to determine the effectiveness of the exclusion zone against termites. Two species of termites were selected for the tests: Oriental subterranean termites because they are the most common and subterranean termites of Formosa because they are the most aggressive. Test cells were assembled with glass containers. Wood shavings were placed in the bottom of the containers. Insecticide impregnated polymer was placed on the wood chips in a way that there was no route or opening above the impregnated polymer to the wood chips. A nutrient-free auger is placed on the impregnated polymer. The surface of the auger is then assigned as a base or reference and the impregnated polymer was mounted at a distance of 5 cm below the surface of the auger. The termites were placed on the surface of the auger and their advance through the auger to the impregnated polymer was recorded every day. The impregnated polymer combinations are illustrated in Table 5.

TABLE 5 Release Rate for 10% Pyrethroid Controls that do not have pyrethroid in a polymer barrier were also used. The results are illustrated in Figure 25 and Figure 26. In all controls, the termites bit through the polymer and gained access to the wood chips. The access speed through ethylvinyl acetate was slower than for polyethylene. For all impregnated polymers, there was no penetration. Because the underground termites of Formosa are so aggressive, they came closer to the impregnated polymer than the less aggressive Oriental subterranean termites. In fact, the polyethylene with permethrin suffered jaw marks from Formosa termites but no holes or penetration. After approximately 12-14 days, even Formosa termites were deterred by the release of insecticide and re-treated with the impregnated polymer. EXAMPLE 6 An experiment to demonstrate the effect of a binding carrier on the rate of release. The active chemicals were tefluthrin and lambda cyhalothrin in an amount of 5% by weight, the binding carrier was carbon black in amounts of 0% by weight and 10% by weight, with the remainder being high density polyethylene (MA). 778-000). Release rates were measured at 6 weeks after manufacture where the samples were cleaned weekly to remove accumulation on the surface of active chemical released. The results are illustrated in Table 6 below.

TABLE 6 Release Rates for Carbon Black 0% by weight and 10% by weight EXAMPLE 7 This example illustrates a method for producing a premix which is subsequently used to produce an active layer (ie the pesticide release layer) of the barrier of the present invention. Low density polyethylene (PE XU59400 or PE XU59400.00 available from The Dow Chemical Company) is cryogenically milled to form particles having approximately 35 mesh particle size. The polyurethane particles are then mixed with the lamp black (Lamp black Superfine # 6 available from General Coal Company) on a Marion type pallet until the carbon is completely dispersed in the polymer forming a homogeneous mixture that has a fluid, dry consistency. Then, with the mixer operating at an internal bulk temperature of about 50 ° C, lambda cyhalothrin available from Syngenta, Inc., is added to the mixture as a molten spray. The agitation of the mixer is maintained after the application of lambda cyhalothrin, to achieve a homogeneous mixture. The premix contains about 3.2% by weight of lambda cyhalothrin, about 4% by weight of lamp black and about 92.8% by weight of low density polyethylene. The premix can be placed in a forced air oven at approximately 60-70 ° C to reduce its moisture content. EXAMPLE 8 A homogeneous premix having about 10.0 wt% of lambda cyhalothrin and about 11.3 wt% of lamp black, is prepared using the procedures described in Example 7. EXAMPLE 9 A premix is prepared using the procedure described in the Example 8 except that molten cyhalothrin lambda is applied to the lamp black as a first stage, and the mixture is then mixed well to form a homogeneously blended powder. The ground low density polyethylene is then added and further mixed is carried out until a uniformly dispersed mixture is obtained having a fluid, dry consistency. EXAMPLE 10 A premix was prepared with approximately 7.9% by weight of carbon black (Color Black FW200 available from Degussa Corporation) and about 9.5% by weight of lambda cyhalothrin, using the procedure as described in Example 7, except that a Eirich type mixer using a high speed agitator is used to mix the components. EXAMPLE 11 Premixes are prepared according to Example 7, Example 8, and Example 10 except that the premixes are not dried. The premixes are extruded with fusion in a strand and then the strand is cut into granules. EXAMPLE 12 A premix is prepared having about 7% by weight of lambda cyhalothrin, about 5% by weight conductive grade carbon black (Vulcan ™ XC-72R available from Cabot Corporation), and the remainder of a low density polyethylene (Novapol LC-0522-A available from Nova Chemicals / 87 Canada Ltd.) using the procedure described in Example 7. EXAMPLE 13 A premix prepared according to Example 12 is injection molded to form thin circular discs. The molded discs are then cut into pieces using a rotary knife shredder. EXAMPLE 14 A premix is prepared having about 6% by weight of lambda cyhalothrin and about 94% by weight of low density polyethylene according to the procedure of Example 7. The resulting premix has a sticky consistency. EXAMPLE 15 A sheet having a uniform composition of about 2% by weight of lambda cyhalothrin (available from Zeneca, Inc.), about 1% by weight conductive grade carbon black (Vulcan ™ XC72R available from Cabot Corporation) is prepared, and the remainder of a high density polyethylene (Microthene ™ 77800 available from Quantum Chemical Company). As a first stage, the carbon black is dried in a forced air oven at a temperature of about 105 ° C for at least 12 hours or until a constant weight is achieved. The dry carbon black is combined with about an equal amount by weight of pulverulent high density polyethylene in a Hobart industrial dough mixer and mixed thoroughly. Then, while agitation is maintained, molten cyhalothrin lambda in an amount of about twice the weight of carbon black, is slowly incorporated into the mixture. The mixture is then added with sufficient amount of additional high density polyethylene, to reduce the concentration of lambda cyhalothrin in the mixture to about 2% by weight. The resulting mixture is then extruded with melting at about 290 ° C and emptied as a single layer film with a thickness of approximately .762 mm (approximately 0.03 inch (30 mils)). EXAMPLE 16 A sheet having about 2% by weight of lambda cyhalothrin, about 1% by weight of conductive grade carbon black (such as Vulcan ™ XC72R available from Cabot Corporation), and the remainder of a high density polyethylene (Microthene ™) was prepared. 78000 available from Quantum Chemical Company) according to the procedure of Example 15. EXAMPLE 17 A sheet having approximately 5% by weight of tefluthrin, approximately 2.5% by weight of carbon black and the remainder of high polyethylene is prepared. density (Microthene ™ MA77800 available from Quantum Chemical Company) using the procedure of Example 15. EXAMPLE 18 A sheet having approximately 5% by weight of tefluthrin, approximately 2.5% by weight of carbon black and the remainder of an ethylene copolymer is prepared. vinyl (EVA 763 available from Quantum Chemical Company) using the procedure of Example 15. EXAMPLE 19 A sheet having approximately 10% by weight of tefluthrin, approximately 5% by weight of carbon black and the rest of high density polyethylene (Microthene ™ MA77800 available from Quantum Chemical Company) using the procedure of Example 15. EXAMPLE 20 A sheet having approximately 10% by weight of tefluthrin is prepared , about 5% by weight of carbon black and the remainder of an ethylene vinyl copolymer (EVA 763 available from Quantum Chemical Company) using the procedure of Example 15.

EXAMPLE 21 A sheet having about 10% by weight of tefluthrin, about 5% by weight of carbon black and the remainder of an ethylene vinyl copolymer (EVA 763 available from Quantum Chemical Company) is prepared using the procedure of Example 15. EXAMPLE 22 A sheet having approximately 10% by weight of permethrin, approximately 5% by weight of carbon black and the remainder of high density polyethylene (MicrotheneMR MA78000 available from Quantum Chemical Company) is prepared using the procedure of Example 15. EXAMPLE 23 Prepare a sheet that has approximately 1% by weight of lambda cyhalothrin, approximately 0.73% by weight of carbon black (Special Black 6 available from Degussa Corporation), and the remainder of low density polyethylene (NovapolMR LC-0522-A available from Nova Chemicals Canada Ltd.) using the procedure of Example 15, except that the melt extrusion process is conducted at about 130 ° C and the cast sheet has a thickness of about 0.0508 mm (about 0.002 inch (2 mils)). EXAMPLE 24 A leaf is prepared using the procedure of Example 23 except for a lambda cyhalothrin concentration of about 5% by weight and a carbon black concentration of about 3.6% by weight. EXAMPLE 25 A sheet is prepared substantially as described in Example 23 except for a lambda cyhalothrin concentration of about 10% by weight and a carbon black concentration of about 7.3% by weight. EXAMPLE 26 Leaves are prepared according to Example 23, Example 24, and Example 25. The sheets are then laminated on both sides with layers of Saranex ™ films 14 (available from The Dow Chemical Company) using a thermal press. EXAMPLE 27 A sheet having approximately 7.9% by weight of gas black (Color Black F 200 available from Degussa Corporation), approximately 9.5% by weight of lambda cyhalothrin, and the remainder of low density polyethylene (PE XU59400 or PE) is prepared. XU59400.00 available from The Dow Chemical Company) using the procedure of Example 15, except that the melt extrusion process is performed at approximately 150 ° C and the cast sheet has a thickness of about 0.0508 mm (0.002 inch (2 mils )). EXAMPLE 28 A leaf is prepared comprising two layers of Saranex ™ 14 bound together by a melt rolling / extrusion process. The tie layer is constituted by the mixture of components as described in Example 26. As a first step, the components of the tie layer are prepared as a powder premix. Then, the premix is extruded by melting at approximately 150 'C directly between two layers of Saranex ™ 14. EXAMPLE 29 This example describes a method for producing an eight layer sheet. The composition of each of the layers of the sheet is as follows. Layer Description 1 New Generation Resin Layer (NGR) (available from Fabrene, Inc.) comprised of black resin (Colortech No. 20413-19 available from Colortech Inc.), polyolefin plastomer extrusion coated grade (AffinityMR PT1450 available from The Dow Chemical Company), and low density polyethylene (NovapolMR LC-0522-A available from Nova Chemicals Canada Ltd.) having a thickness of about .0254 mm (0.001 inch (1 mil)); Saranex ™ Layer 14 (available from The Dow Chemical Company) composed of vinylidene chloride / vinyl chloride copolymer, low density polyethylene, ethylene / vinyl acetate copolymer, and silicon dioxide having a thickness of about .0508 mm ( 0.002 inch (2 mils)); MGR layer as described above; Canvas layer (available from Fabrene Inc.) composed of high density polyethylene (SclairMR HDPE No. 99G available from Nova Chemicals Corporation) and black carbon resin (PlasblackMR PE 1371 available from Cabot Corporation) having a thickness of approximately .1016 mm (0.004 inch (4 mils)); Low density polyethylene bond layer (NovapolMR LC-0522-A available from Nova Chemicals Canada Ltd.) containing black resin (Colortech No. 20413 19 available from Colortech Inc.) having a thickness of approximately .0254 mm (0.001 inch) (1 mils)); active ingredient layer composed of gas black (Color Black FW200 available from Degussa Corporation), lambda cyhalothrin, and low density polyethylene (PE XU59400 or PE XU59400.00 available from The Dow Chemical Company) having a thickness of about .0508 rare (0.002 inch) (2 mils)); 7 Layer of Saranex ™ 14 as described above, and 8 Layer NGR as described above. The eight layer sheet is formed by attaching a layer of NGR (layer 1) to a sheet of Saranex ™ 14 (layer 2) using an extrusion coating method to form a layer composite 1-2. Another layer of NGR (layer 3) is extruded by melting to join the composite layer 1-2 to a sheet of canvas (layer 4) to form a composite layer 1-2-3. A layer of low density polyethylene (layer 5) is applied to the layer composite 1- 2-3 by an extrusion coating method to form the first outer layer. A layer composite 7-8 is prepared by applying an NGR layer (layer 8) to a Saranex ™ layer sheet 14 (layer 7) by extrusion coating. A pre-mix is made using the procedure of Example 10, which has approximately 7.9% by weight of gas black, 9.5% by weight of lambda cyhalothrin and the remainder being a low density polyethylene. The pre-mix is formed into granules of active ingredient using the procedure of Example 11. The granules of active ingredient are mixed with low density polyethylene granules (PE XU59400 or PE XLJ59400.00 available from The Dow Chemical Company) in a proportion about 2: 1 to achieve a concentration of about 6% by weight of lambda cyhalothrin in the mixture of granules. The granule mixture is fed to an extruder for extrusion-fusion bonding of the first outer layer (ie, layers 112, 116, 120, 122 and 126) and the second outer layer (ie, layers 118 and 114). ). A multilayer laminate sheet having a total thickness of approximately .356 mm (0.014 inch (14 mils)) is formed. The concentration of lambda cyhalothrin in the laminated sheet formed is approximately 0.9% by weight. EXAMPLE 30 A sheet is prepared using the procedure described in Example 29 except that the active layer is composed of about 4% by weight of carbon black (Color Black FW200 available from Degussa Corporation), about 4.7% by weight of lambda cyhalothrin, and the remainder of a low density polyethylene (PE XU59400 or PE XU59400 or PE XU59400.00 available from The Dow Chemical Company). The concentration of lambda cyhalothrin in the laminated sheet formed is approximately 0.5% by weight. EXAMPLES 31-37 Premix sheets of lamp black (Lamp black Superfine # 6 available from General Coal Company), lambda cyhalothrin, and low density polyethylene (PE XU59400 or PE XU59400.00 available from The Dow Chemical Company) are prepared. The sheets are formed into laminates substantially using the procedure of Example 29, but having a final concentration of lambda cyhalothrin in the laminated sheet formed as set forth in Table 7 below. TABLE 7 Example% by weight of% by weight% by weight of Black of Lambda Lambda Lamp of cyhalothrin cyhalothrin in Laminated Sheet 31 4 3.5 1 32 2 1.8 0.5 33 1 0.88 0.25 34 0.5 0.44 0.12 35 0.25 0.22 0.06 36 0.125 0.11 0.03 37 0.06 0.05 0.01 EXAMPLE 38 A six layer sheet having the following composition is formed as follows: Layer Description 1 Layer of New Generation Resin (NGR) (available from Fabrene, Inc.) comprised of black resin (Colortech No. 20413-19 available from Colortech Inc.), polyolefin plastomer extrusion coating grade (Affinity141 PT1450 available from The Dow Chemical Company), and low density polyethylene (NovapolMR LC-0522-A available from Nova Chemicals Canada Ltd.); 2 Saranex ™ Layer 14 (available from The Dow Chemical Company) composed of vinylidene chloride / vinyl chloride copolymer, low density polyethylene, ethylene / vinyl acetate copolymer and silicon dioxide; 3 layer of canvas composed of high density polyethylene (SclairMR BDPE No. 99G available from Nova Chemicals Corporation); 4 layer of active ingredient composed of 0.91 weight percent of lambda cyhalothrin in a technical solution of 85 weight percent, 0.95 weight percent of Lamp black # 6, and 22 weight percent of LDPE resin; 5 Saranex ™ layer 14 as described above; Y 6 layer of NGR as described above. The six-layer sheet was subjected to the concrete plate method of the US Forest Service. (USFS = United States Forest Service). The concrete plate method simulates a cast concrete foundation. To establish a test project, leaves and debris are removed to expose the ground in a square area of 60.96 cm (24 inches) on one side. A 53.34 cm (21 inch) square wooden frame constructed of 2.54 x 2.54 cm (1 x 1 inch) spruce strips is placed at the center of the cleared area and a triangular trench with a depth of 5.08 cm (2 inches) and two directly on the treated land. The PVC pipe is capped to reduce moisture loss and to prevent rain and sunlight from affecting the termiticxda. The results of field tests with concrete plate for the following locations are illustrated below in Table 8.

TABLE 8 As illustrated in Table 8, none of the projects treated with the six-ply sheet was penetrated by the termites. While the present invention has been described with reference to one or more particular embodiments, those skilled in the art will recognize that many changes can be made thereto, without departing from the spirit and scope of the present invention. Each of these modalities and their variations that fall within the spirit of invention

Claims (1)

1. CLAIMS 1. A multi-pest barrier against pests, characterized in that it comprises: at least one layer of pesticide release; and at least one pesticide release layer placed parallel to the pesticide release layer, the pesticide release layer contains at least one pesticide, the pesticide retention layer in transit only releases small amounts of the pesticide. 2. The multi-layer barrier of claim 1, characterized in that the pesticide retention layer comprises Saranex ™. 3. The multi-layer barrier of claim 1, characterized in that two pesticide retention layers are placed on opposite sides of the pesticide release layer. 4. The multi-layer barrier of claim 1, characterized in that the pesticide release layers are made of a polymeric material, the polymeric material substantially does not allow the release of the pesticide from the barrier. 5. The multi-layer barrier of claim 1, characterized in that the pesticide release layer comprises: a polymer matrix; and a pesticide in the matrix. 6. The multi-layer barrier of claim 5, characterized in that the pesticide is selected from pyrethroids, neonicotinoids, isofenphos, fenvalerate, pyrethrin, and combinations thereof. The multi-layer barrier of claim 5, characterized in that the pesticide is chosen from tefluthrin, permethrin, lambda cyhalothrin, resmethrin, deltamethrin, cypermethrin, cyfenot rin, cyfluthrin, deltamethrin, chlorpyrifos, phenoxycarb, diazinon, dichlorophen, methyl isothiocarbamate, pentachlorophenol, tralomethrin, chlorfenapyr, fipronil, neonicotinoids, and combinations thereof. 8. The multi-layer barrier according to claim 5, characterized in that the pesticide is lambda cyhalothrin. 9. The multi-layer barrier according to claim 5, characterized in that the polymer matrix is made from low density polyethylene. 10. The multi-layer barrier according to claim 5, characterized in that the polyethylene is linear low density polyethylene. The multi-layer barrier according to claim 1, characterized in that it also comprises at least one fungicide release layer within the pesticide retention layers to prevent deterioration of the fungal barrier. The multi-layer barrier according to claim 1, characterized in that it further comprises at least one layer of mechanical strength and puncture resistance within the pesticide retention layers to provide mechanical strength and puncture resistance to the barrier. 13. The multi-layer barrier according to claim 12, characterized in that the layer of mechanical resistance and puncture resistance is made of a polymeric canvas. 1 . The multi-layer barrier according to claim 13, characterized in that the layer of mechanical resistance and resistance to perforations is made of polyethylene. 15. The multi-layer barrier according to claim 1, characterized in that the pesticide is effective against termites, ants that perforate the wood and insects that perforate the wood. 16. The multi-layer barrier according to claim 1, characterized in that the barrier is configured to encircle an area or structure. 17. The multi-layer barrier according to claim 1, characterized in that the rate of release of the pesticide from the barrier is less than 0.4 / g / cm2 / day. The multi-layer barrier according to claim 5, characterized in that the matrix comprises a polymer and further comprises a carrier for adjusting the release rate of the pesticide from the matrix. 19. A method for producing a pre-mix for an active layer of a barrier film, for use in preventing a pest that perforates the wood from accessing an area or a structure containing wood, the method is characterized in that it comprises the steps of : (a) mix carbon black with particles of a polymer to form a mixture; and (b) adding one or more pesticides in a liquid form to the mixture, to form a friable pre-mix. 20. A multi-layer barrier film for use in preventing a pest that perforates wood from entering an area of a wood-containing structure, the barrier film is characterized in that it comprises: a first layer comprising a protective resin; a second layer comprising a pesticide retaining material, which substantially prevents the pesticide from passing through; a third layer comprising the protective resin; a fourth layer comprising a film resistant to perforations and with mechanical strength; a fifth layer comprising a binding polymer; a sixth layer comprising a polymer matrix containing carbon black and one or more pesticides; a seventh layer comprising the pesticide retention material; and an eighth layer made of protective resin wherein the rate of release of the pesticide from the sixth layer to the other layers is higher than the rate of release of the pesticide from the barrier film and where substantially no release of the pesticide from the film itself barrier. 21. The barrier film according to claim 20, characterized in that the protective resin comprises a mixture of polyolefin plastomer, color concentrate and polyethylene. 22. The barrier film according to claim 20, characterized in that the protective resin provides protection against the ultraviolet barrier. 23. The barrier film according to claim 20, characterized in that the pesticide retention material substantially prevents the release of the pesticide from the barrier film. 24. The barrier film according to claim 20, characterized in that the material of the second and seventh layers is a polymer having a melting point of about 143 ° C and neither is bio-degradable nor photo-degradable. 25. The barrier film according to claim 20, characterized in that the pesticide retention material of the second and seventh layers comprises Saranex1® 14. 26. The barrier film according to claim 25, characterized in that the Saranex ™ 14 consists of low density polyethylene, vinylidene chloride / vinyl chloride copolymer, ethylene / vinyl acetate copolymer and silicon dioxide. 27. The barrier film according to claim 20, characterized in that the resin of the third layer comprises a mixture of polyolefin plastomer, color concentrate and polyethylene. 28. The barrier film according to claim 20, characterized in that the fourth layer is made of woven high-density polyethylene. 29. The barrier film according to claim 20, characterized in that the fifth layer comprises a low density polyethylene having a melting point of approximately 165 ° C. 30. The barrier film according to claim 20, characterized in that the carbon black of the sixth layer is lamp black. 31. The barrier film according to claim 20, characterized in that the polymer matrix of the sixth layer comprises low density polyethylene. 32. The barrier film according to claim 20, characterized in that the polymer matrix of the sixth layer comprises low density polyethylene catalyzed by metallocene. 33. The barrier film according to claim 31, characterized in that the low density polyethylene has a melting point of about 80 ° C. 34. The barrier film according to claim 20, characterized in that at least one of the pesticides in the sixth layer is present in an amount such that its supply is not exhausted before approximately 10 years. 35. The barrier film according to claim 20, characterized in that at least one of the pesticides in the sixth layer is present in an amount of at least 5% of the sixth layer, by weight. 36. The barrier film according to claim 20, characterized in that at least one of the pesticides in the sixth layer is present in an amount of at least 10% of the sixth layer by weight. 37. The barrier film according to claim 20, characterized in that at least one of the pesticides in the sixth layer is lambda cyhalothrin. 38. The barrier film according to claim 37, characterized in that lambda cyhalothrin in the sixth layer is present in an amount of at least about 2.75 grams per square meter of the barrier film. 39. The barrier film according to claim 20, characterized in that at least one of the pesticides in the sixth layer is a bio-active chemical of low volatility. 40. The barrier film according to claim 20, characterized in that at least one of the pesticides in the sixth layer is selected from the group consisting of pyrethroid, isofenphos, fenvalerate, cypermethrin, pyrethrin, fenoxicarb, chlorpyrifos, diazinon, dic lorophen, methyl isothiocyanate, pentachlorophenol, traloraethrin and combinations thereof. 41. The barrier film according to claim 20, characterized in that at least one of the pesticides in the sixth layer is selected from the group consisting of tefluthrin, permethrin, lambda cyhalotrhrin, resmethrin, deltamethrin, cypermethrin, cyphenothrin, cyfluthrin, deltamethrin, chlorpyrifos, phenoxycarb, diazinon, dichlorophen, methyl i sothiocinate, pentachlorophenol, tralomethrin, chlorfenapyr, fipronil, neonicotinoid and combinations thereof. 42. The barrier film according to claim 20, characterized in that at least one of the pesticides in the sixth layer is selected from the group consisting of thiamethoxam, nitenpyram, imidacloprid, clothianidin, acetamiprid, thiacloprid, and combinations thereof. 43. The barrier film according to claim 20, characterized in that the sixth layer is prepared by combining the pesticide with the carbon black, to form a bonded friable mixture and adding the friable mixture bound to the polymer matrix. 44. The barrier film according to claim 20, characterized in that the sixth layer includes at least one pesticide and mixes with at least one fungicide. 45. The barrier film according to claim 44, characterized in that the fungicide is chosen from trichloronitromethane, a mixture of methylisothiocyanate and 1,3-dichloropropane, sodium N-methyl dithiocarbonate, 2, 3, 5, 6-tetrachloro-l. , 9-benzoquinone, calcium cyanamide, biphenyl, copper naphthenate, dichlorophen, fentin hydroxide and combinations thereof. 46. The barrier film according to claim 20, characterized in that the polymer matrix is present in an amount of approximately 77% by weight of the sixth layer and wherein the sixth layer is present in an amount of approximately 23% by weight of the barrier film. 47. The barrier film according to claim 20, characterized in that the carbon black is present in an amount of about 11% by weight of the sixth layer. 48. The barrier film according to claim 20, characterized in that the polymer matrix is hydrophobic. 49. The barrier film according to claim 20, characterized in that the barrier film has a thickness from approximately .254 to .762 mm (approximately 0.010 to 0.030 inches). 50. A barrier film to be used in preventing a pest that perforates the wood from entering an area or structure containing wood, the barrier film is characterized in that it comprises: a first layer comprising a protective resin, the protective resin comprises a mixture of polyolefin plastomer, color concentrate and polyethylene; a second layer comprising a pesticide retention material that substantially prevents the pesticide from passing therethrough; a third layer comprising the protective resin, the protective resin comprising a mixture of polyolefin plastomer, color concentrate and polyethylene; a fourth layer comprising a film of puncture resistance and mechanical strength, comprising high density polyethylene; a fifth layer comprising a low density polyethylene; a sixth layer comprising a polymer matrix containing carbon black and one or more pesticides; a seventh layer comprising the pesticide retention material; and an elaborate eighth layer of the protective resin, the protective resin comprises a blend of polyolefin plastomer, color concentrate and polyethylene, wherein the release rate of the pesticide from the sixth layer in the other layers is greater than the rate of release of the barrier film pesticide and where substantially no pesticide release from the barrier film itself. 51. The barrier film according to claim 50, characterized in that the pesticide retaining material comprises Saranex ™ 14. The barrier film according to claim 50, characterized in that the carbon black is lamp black. 53. A method for producing a barrier film comprising the following steps: mixing carbon black with particles of a polymer to form a mixture; adding one or more pesticides in liquid form to the mixture while maintaining the mixture at a temperature below the temperature at which the pesticide decomposes but above the melting temperature of the pesticide to form a friable pre-mix; extrude with melting the pre-mix to form a thin active layer; and extruding the premix together with first and second protective resins, a multilayer film, low density polyethylene and canvas to form an eighth layer of barrier film wherein a first layer comprises a first protective resin; a second layer comprises a pesticide retention film that substantially prevents the pesticide from passing through; a third layer comprising a second protective resin; a fourth layer comprising a canvas; a fifth layer comprising low density polyethylene; a sixth layer comprising an active layer comprising a mixture of a sixth layer of polymeric matrix, carbon black and one or more pesticides; a septic layer comprising the pesticide retention film; and an eighth layer comprising the first protective resin, wherein the rate of release of the pesticide from the sixth layer in the other layers is greater than the rate of release of the pesticide from the barrier film and wherein substantially no release of the pesticide from the barrier film itself. 54. The barrier film according to claim 53, characterized in that the pesticide retention film comprises Saranex * "14. 55. The barrier film according to claim 53, characterized in that the carbon black is lamp black. The barrier film according to claim 53, characterized in that the carbon black is gas black. 57. A multi-pest barrier against pests, characterized in that it comprises: at least one pesticide release layer comprising a polymeric matrix, the matrix comprises a pesticide and a carrier, the matrix and the carrier control the release of the pesticide from the matrix; and two pesticide retention layers placed on opposite sides of the pesticide release layer, the pesticide release layer contains at least one pesticide, the pesticide retention layers release only small amounts of the pesticide through. 58. The multi-layer barrier according to claim 57, characterized in that the pesticide retention layers comprise Saranex ™. 59. The multi-layer barrier according to claim 57, characterized in that the pesticide retention layers are made of a polymeric material, the polymeric material does not substantially allow release of the pesticide from the barrier. 60. The multi-layer barrier according to claim 57, characterized in that the thickness of the pesticide retention layers is about 0.0254 to 0.127 mm (about 0.001 to 0.005 inches). 61. The multilayer barrier according to claim 57, characterized in that the pesticide is selected from pyrethroids, neonicotinoids, isofenphos, fenvalerate, pyrethrin and combinations thereof. 62. The multilayer barrier according to claim 57, characterized in that the pesticide is chosen from tefluthrin, permethrin, lambda cyhalothrin, resmethrin, deltamethrin, cypermethrin, cyphenothrin, cyfluthrin, deltamethrin, chlorpyrifos, phenoxycarb, diazinon, dichlorophen, methyl isothiocyanate , pentachlorophenol, tralomethrin, chlorfenapyr, fipronil, neonicotinoids and combinations thereof. 63. The multilayer barrier according to claim 57, characterized in that the pesticide is selected from a group consisting of thiamethoxam, nitenpyram, imidacloprid, clothianidin, acetamiprid, thiacloprid, and combinations thereof. 64. The multilayer barrier according to claim 57, characterized in that the pesticide is lambda cyhalothrin. 65. The multi-layer barrier according to claim 57, characterized in that the polymer matrix is made of low density polyethylene. 66. The multi-layer barrier according to claim 65, characterized in that the polyethylene is linear low density polyethylene. 67. The multi-layer barrier according to claim 57, characterized in that the carrier is lamp black. 68. The multilayer barrier according to claim 57, characterized in that the thickness of the pesticide release layer is from about .0254 to .0127 mm (about 0.001 to 0.005 inch). 69. The multilayer barrier according to claim 57, characterized in that the pesticide release layer further comprises at least one fungicide selected from trichloronitromethane, a mixture of methylisothiocyanate and 1,3-dichloropropane, sodium N-methyl dithiocarbonate, 2, 3, 5, 6-tetrachloro-l, 9-benzoquinone, calcium cyanamide, biphenyl, copper naphthenate, dichlorophen, fentin idroxide and combinations thereof. 70. The multi-layer barrier according to claim 57, characterized in that it also comprises at least one fungicide release layer within the pesticide retention layers to prevent deterioration of the fungal barrier. 71. The multi-layer barrier according to claim 57, characterized in that it further comprises at least one layer of mechanical strength and puncture resistance within the pesticide retention layers, to provide mechanical strength and resistance to perforations to the barrier. 72. The multi-layer barrier according to claim 71, characterized in that the layer of mechanical strength and puncture resistance is made of polymeric canvas. 73. The multilayer barrier according to claim 71, characterized in that the layer of mechanical resistance and resistance to perforations is made of high-speed polyethylene woven. 74. The multi-layer barrier according to claim 57, characterized in that the thickness of the barrier is in the range of about .254 to .762 rare (0.010 to about 0.030 inch). 75. The multi-layer barrier according to claim 57, characterized in that it also comprises at least one protective layer to protect the barrier against ultraviolet light and provide seal capacity to the barrier. 76. The multi-layer barrier according to claim 75, characterized in that the protective layer is made of a thermo-sealable polymer.