MXPA99005464A - Shoe lasting adhesive - Google Patents

Abstract

A hot-melt adhesive for use as a shoe last adhesive, particularly one in a form for use in a directthrough feed adhesive dispensing system, made from a melt-blend of a copolymer of ethylene and carboxylic acid, a synthetic wax such as a Fischer-Tropsch wax, and an ethylene/unsaturated carboxylic acid wax having a melt index of at least about 5000 dg/min.

Description

FIELD LINING FABRIC ADHESIVE BACKGROUND OF THE INVENTION Field of the Invention This invention relates to a thermal melt adhesive, in particular an adhesive made from a copolymer of ethylene and carboxylic acid mixed with a synthetic wax such as a wax of Fischer - Tropsch and an ethylene / unsaturated carboxylic acid wax of high melt index having a melt index of at least about 5000 dg / min. The adhesive is particularly useful in the form of a rod or strip in direct through feed adhesive jets used for the application of footwear liner fabric adhesive.

BACKGROUND OF THE INVENTION AND RELATED ART Melting systems and application of direct through feed adhesives have been used for a long time in the manufacture of footwear. These are systems in which the solid adhesive material is supplied to an assortment apparatus at the rate at which the thermally softened adhesive is applied to a workpiece and in which there is no deposit or container or other substantial body of retained adhesive. in molten condition outside the direct flow line from the inlet to the outlet of the assortment apparatus. The adhesive for these systems is in REF .: 30291 form of flexible thin strips or rods. These rods must be rigid enough to be fed longitudinally but must be appropriately flexible to be rolled and unwound for use without cracking and without blocking or sticking to the adjacent rod when they are wound. To work effectively, the adhesive rod must have a combination of properties, particularly freedom of tack, dimensional stability, shape retention and resistance to degradation during storage, such that the rod does not change in the manner required to cooperate with the step of softening and assortment. U.S. Patent Nos. 3,283,890 and 3,317,368 which are incorporated by reference herein teach such systems. U.S. Patents 2,762,716 and 2,765,768 are cited in U.S. Patent 3,283,890 which discloses direct through feed systems. U.S. Patent No. 3,283,890 teaches rods of substantially uniform cross section made by mixing various ingredients. U.S. Patent No. 3,317,368 teaches a composite thermoplastic adhesive rod having a longitudinally extending central portion and an outer layer surrounding the central portion.

Polyamide rods have been commonly employed with direct through feed systems for shoe lining fabric adhesives. However, polyamides tend to become brittle or brittle at low temperatures and have poor thermal stability. It has been found that polyamide rods for use in existing through-feed systems such as footwear liner adhesives can be replaced with thermal melt adhesives based on ethylene copolymers and an alpha, beta-ethylenically unsaturated carboxylic acid. If you can get a combination of low viscosity, high stiffness, good elongation, fast setting speed in a shoe line and specific adhesion to a wide range of substrates (eg oily leather, synthetic leather, shoe board and polyvinyl chloride) ). Ethylene copolymers alone do not meet these requirements. It has further been found that by proper selection of the ethylene copolymers and by mixing them with certain waxes there results a footwear liner adhesive that will effectively move over the existing feed systems in place of the highest cost polyamides.

BRIEF DESCRIPTION OF THE INVENTION In accordance with the present invention a thermal fusion adhesive is provided, in particular one in the form of a rod, strip, belt or the like for use in a direct feed feed adhesive assortment system and more particularly for adhesive applications for shoe lining fabric. It consists essentially of: (a) a copolymer of ethylene with an unsaturated carboxylic acid selected from the group consisting of acrylic acid (E / AA copolymer) and methacrylic acid (E / MAA copolymer) having a melt flow index (MI) as measured by the standard or ASTM 1238 standard E condition of at least 100 decigrams per minute (dg / min) at approximately 2000 dg / min., But preferably approximately 500 dg / min. (b) a synthetic wax selected from the group consisting of Fischer-Tropsch wax, polyethylene wax and its oxidized counterparts and (c) an E / AA or E / MAA copolymer of high melt flow index, such as if measured by the standard ASTM 1238 condition E of at least about 5,000 dg / min., but preferably at least 10,000 dg / min. The high melt flow index E / AA or E / MAA copolymer of this invention has viscosities of less than about 5000 centipoise (cp), preferably of about 600 cp at 140 ° C.

DETAILED DESCRIPTION OF THE INVENTION For the purpose of the present invention and the claims, the expression "consists essentially of" means that the components cited are essential, while minor amounts of other components may be present to the extent that they do not impair functionality of the present invention. The adhesive of the present invention consists essentially of a molten mixture of ethylene acid copolymer, synthetic wax and high melt flow rate copolymers as more fully described hereinafter. Preferably the adhesive consists essentially of about 50 to about 95, more preferably about 70 to about 90 percent by weight (% by weight) of ethylene-acid copolymer, of about 5 to about 30, more preferably about 8 to about 20 weight percent synthetic wax and from about 5 to about 30, more preferably about 8 to about 20 weight percent of high melt flow index (MI) copolymer. The percentages by weight are based on the total weight of the ethylene-acid copolymer, synthetic wax and high MI copolymer. Minor amounts of other components such as fillers, antioxidants, dyes and stabilizing additives which do not substantially adversely affect the system compatibility or the desired combination of low viscosity, fast setting speed in a shoe line and specific adhesion to a wide range of substrates, in particular oily leather, synthetic leather, shoe board and polyvinyl chloride. While low levels of components such as tackifying agents may be added, paraffin wax and microcrystalline wax to adjust some properties are preferably excluded particularly when making a flexible solid thermoplastic adhesive for passive direct feed adhesive assortment systems. The adhesive in the form of flexible thin strips or strips for use in the direct-feed feed adhesive jets used for adhesive application, for footwear lining fabric can be made by various methods such as by extrusion, drawing or the like. Useful devices for manufacturing the continuous rods are well known in the art. When using extrusion by example, the following methods can be employed to manufacture the continuous rods of this invention. First, the thermal melt adhesive can be manufactured by tumbling the dry ingredients and then feeding to an extruded mixed in the molten state. For example, . some of the blends were made in a 3.8 cm (1 1/2 inch) Davis Standard extruder (single screw extruder with screw mixer) and some in a 30 mm Werner and Flieder extruder (twin screw extruder). It was found that both types of extruders work well. In any case, the strands of the extruder leave the extruder through a water bath of the strand and then are transformed into pellets or pellets. The pelletized mixtures can then be fed to an extruder equipped with a nozzle hole dimensioned to produce the desired strand diameter. For example, pellets of the blends of this invention were fed to a 3.8 cm (1 1/2 inch) Davis Standard extruder equipped with a 0.255 inch (0.57 cm) single hole nozzle. In order to process these comparatively low viscosity blends in the extruder it was found important to adjust the temperature as low as possible, this is close to the melting point of the ingredients. Typical temperatures are from about 90 to about 100 ° C. If the temperature were too high, ie about 150 to 200 ° C, the strand leaving the nozzle would be too "shifting" and would not have a sufficient melt strength to make a good strand.

The strand exits the nozzle to a water bath of the strand and then through a two-band separation roller. The speed of the extruder (revolutions per minute (R.P.M.)) and the speed of the separation roller can be varied to obtain the required rod thickness. By decreasing the separation speed, the thickness of the rod increases. By increasing the separation speed the thickness decreases. The diameter of the flexible rod can be varied based on the proposed use and the nature of the assortment and direct feed application machine, but preferably has a diameter of about 3.5 to about 4.5 millimeters. The rod can be rolled into reels for storage and use and is stable (does not crack or "forge" into a solid block in storage for more than six months). It has also been found that the adhesives of the present invention can be formed into flexible solid thermoplastic strands in a single extrusion step, that is, the dry ingredients can be tumbled and then fed directly to an extruder equipped with a nozzle hole of appropriate size (for example, a Davis Standard extruder with a 0.57 cm (0.225 inch) single-hole nozzle as used in the examples) without first making a molten mixture and agglomerates. As the strand exits the nozzle, it passes through a water bath of the strand and then onto the separation rollers. A single stage of extrusion would be preferred for commercial production because it has the lowest manufacturing cost. Since most extruders are designed to handle high viscosity materials, special attention must be given to the processing of adhesives of the present invention since they have very low viscosities. There are several ways to make material processing easier to ensure good mixing. The extruder can be put into operation with a constant temperature profile that is just above the melting point of the polymers and waxes, that is, around 100 ° C. Another procedure is to use a temperature profile that is higher than the melting point of the polymers and waxes at the feed end of the extruder and is lower than the melting point but higher than the freezing point of the polymers and waxes in the rear end of the extruder and the nozzle, that is, approximately 80 to 100 ° C. Still another procedure is to install sieve packs, ie around 4 having 100 mesh screens between the screw tip and the nozzle to increase the back pressure to improve mixing.

The materials can also be mixed in typical thermal fusion equipment such as heated batch mixers equipped with agitators. The material can be transformed into pellets or pellets as it leaves the hot melt mixer and the pellets can be fed to an extruder to make the rod. Alternatively, the hot melt of the hot melt mixer can be fed directly to an extruder instead of the first pilling, this is a preferred method since the adhesive would have less thermal history.

Ethylene-acid copolymer The ethylene acid copolymer employed in the present invention is a copolymer of ethylene with at least one alpha, beta-unsaturated carboxylic acid of 3 to 7 carbon atoms, preferably one selected from the group consisting of acid acrylic (E / AA copolymer) and methacrylic acid (E / MAA copolymer). The copolymer may contain from about 5 to about 30, preferably from about 7 to about 20,% by weight of the unsaturated carboxylic acid. While the dipolymers are preferred, small amounts of a third monomer, such as for example alkyl esters of 1 to 10 carbon atoms of alpha, beta-unsaturated carboxylic acid from 3 to 7 carbon atoms, vinyl esters, vinyl ethers, vinyl ethers, acrylonitrile, methacrylonitrile, carbon monoxide and sulfur dioxide can be incorporated. The ethylene acid copolymer useful in this invention has a melt flow index, as measured by the standard ASTM 1238 Condition E, which requires a temperature of 190 ° C and a weight of 2,160 grams, of at least 100 dg / minute at approximately 2000 dg / minute, but preferably approximately 500 dg / minute. Normally, the MI (melt flow rate) of these copolymers is measured according to ASTM 1238 condition A (125 ° C and weight 350 grams) and converted to MI, as if measured according to condition E The methods of preparation of these ethylene acid copolymers are well known in the art.

Synthetic Wax The synthetic wax employed in the present invention is a slightly incompatible synthetic wax selected from the group consisting of Fischer-Tropsch wax, polyethylene wax and its oxidized counterparts. U.S. Patent Nos. 2,504,400; 2,683,141 and 2,712,534 incorporated herein by reference teach useful synthetic waxes. Examples of various synthetic waxes are POLYWAX®655 (a polyethylene wax from Barreco); ALLIED®629 (an oxidized polyethylene wax from Allied Chemical); PARAFLINT®H-1 (a Fischer-Tropsch wax (polyethylene) from Moore &Munger) and PARAFLINT® H105 (a Fischer-Tropsch wax from Moore &Munger).

High MI copolymer High MI copolymers, also known in the industry as "low molecular weight polymers" employed in the present invention comprise ethylene alpha, beta-unsaturated carboxylic acid, preferably ethylene-acrylic acid copolymer (E / AA) or ethylene-methacrylic acid (E / MAA) having a melt flow index, as measured by the ASTM 1238 standard E condition requiring a temperature of 190 ° C and a weight of 2,160 grams of at least approximately ,000 dg / minute, but preferably at least 10,000 dg / minute. Since the MI of these high MI copolymers is so high, their viscosity is generally measured and converted to the MI as measured according to the ASTM 1238 condition E. The high MI copolymers of this invention have viscosities, such as they are measured with a viscometer Brookfield of less than about 5000 cp at 140 ° C, preferably about 600 cp at 140 ° C. Normally they will be dipolymers although minor amounts of a third monomer, such as for example alkyl esters of 1 to 10 carbon atoms of alpha, beta-unsaturated carboxylic acid, vinyl esters, vinyl ethers, methacrylonitrile, carbon monoxide and sulfur dioxide. The high MI E / AA copolymers are available from Allied Signal Corporation under the trademark A-C® Copolymers. They can be made according to the general description of US Pat. No. 3,264,272 issued to Rees. The commercial ethylene and acrylic acid or methacrylic acid are fed in a continuous manner to a stirred pressure vessel with a free radical initiator (t-butyl peroxyacetate) fed by a separate line. The flow of monomers is adjusted to give constant molar proportions and the feed rate is the same as the discharge rate of polymer and unpolymerized monomers from the reactor. Small amounts of telogen (acetone or methanol) are introduced into the reactor with the monomers fed to control the molecular weight.

Other Components Other ingredients such as fillers, antioxidants and slip additives can be added, provided they are added at low levels (preferably less than about 10, more preferably less than about 7 parts per hundred based on weight total ethylene acid copolymer, synthetic wax and copolymer mixture high MI) so as not to adversely affect the balance of properties of the adhesive. FILLERS such as calcium carbonate or titanium dioxide can be added to make the adhesive opaque or to slightly increase stiffness. If high levels of filler are added then the viscosity will increase too much. ANTIOXIDANTS that are well known in the thermal fusion adhesive industry can be used to increase the thermal stability of the adhesive. Typical levels are less than 1% by weight based on the weight of the primary components of the adhesive. SLIP ADDITIVES can be used to help the adhesive process better on existing equipment.

The disadvantage of using SLIP adhesives is that they deteriorate the specific adhesion to most substrates. Other ingredients such as paraffin wax, microcrystalline wax and tackifiers are preferably avoided but may be included in certain cases at low levels (preferably less than about 10, more preferably less than about 7 parts per hundred based on weight total ethylene acid copolymer, synthetic wax and high MI copolymer mixture) to obtain the desired properties. PARAFFIN WAX or MICROCRYSTALLINE WAX can be added to the adhesive to decrease the viscosity and cost of the adhesive. The disadvantage with them is that they will increase the open time (lower line speed). They will also impair the specific adhesion to most substrates. The microcrystalline wax will also decrease the modulus. ADHERENT AGENTS that may be used include pitch esters, pitch acids and some hydrocarbon resins. The advantage of using the adhesives is that they improve the specific adhesion and reduce the viscosity of the adhesive. The disadvantage of adding the adhesive is that they make the adhesive softer (more flexible) which makes it difficult to feed it through the existing application equipment. The adherent agent also causes the open time to increase (lower line speed).

EXAMPLES Preparation of mixtures and tests The first stage was to prepare samples of 100 grams. A can of one pint paint (approximately 500 ml) was placed in a hot block that was heated to 177 ° C (350 ° F). The ingredients in the form of pellets dry, pills, flakes or dust. The primary ingredients (NUCREL®, PARAFLINT® and A-C®) were drum dried in parts per hundred parts based on the weight of the total primary ingredients indicated in the tables. The other ingredients (IRGANOX® and TIPÜRE®) were mixed in parts per hundred parts based on the weight of the total ingredients as indicated in the tables. After these ingredients melted, they were agitated with a three-bladed stirrer driven by air at a tip speed of about 50 to 100 revolutions per minute. The resulting molten mixtures are poured onto release paper and allowed to solidify and inspected to see if they are brittle or flexible. The flexible samples are tested to determine the viscosity in a Brookfield Thermocel device (model DV-II) at 77 ° C and 204 ° C (350 ° F and 400 ° F). The cutting speed was between 1 and 50 s_1. The resulting molten mixtures were also compression molded. Approximately 15 grams of the mixture were placed in n mold that was approximately 0.3175 cm (1/8 inch) thick and 10.16 cm by 10.16 cm (4 inches by 4 inches). The mold was heated to a temperature of approximately 177 ° C (350 ° F) and maintained at this temperature for approximately five minutes and then cooled to room temperature.

The samples were then tested for tensile strength and percent elongation by ASTM D 1708 standard and also tested for flexural modulus by the ASTM D790 standard.

Preparation of rods The dry ingredients totaling between approximately 5 to 10 kilograms (10 and 20 pounds) were drum mixed and then fed to an extruder. Some of the mixes were made in a 3.8 cm (1 1/2 inch) Davis Standard extruder (single screw extruder with a mixer screw) and some in a 30 mm Werner and Pflieder extruder (twin screws). It was found that both types of extruders work well. Either in one case or another the extruded strand exited the extruder through a water bath for the strand and was then transformed into pellets. The mixtures transformed into pellets or pellets were fed to a 3.8 cm (1 1/2 inch) Davis Standard extruder (a single screw with mixer screw) that was equipped with a 0.57 cm (0.225 inch) single-hole nozzle. In order to process these comparatively low viscosity blends well into the extruder, it was found important to adjust the temperature so low as possible, that is, close to the melting point of the ingredients. Typical temperatures were from 90 to approximately 100 ° C. If the temperature were too high, ie approximately 150 to 200 ° C, the strand leaving the nozzle would be very "shifting" and would not have enough resistance in the molten state to make a good strand. The extruder was equipped with 4 sieve packs of 100 mesh sieves between the tip of the screw and the nozzle. The strand exited the nozzle to a strand bath and was then fed through a two-band separation roller. The speed of the extruder (revolutions per minute (R.P.M.)) and the speed of the separation roller were varied to obtain the required thickness of the rod. By decreasing the separation speed, the thickness would increase. By increasing the separation speed the thickness would decrease. The desired strand diameter was either 4.05 mm or 4.25 mm. Once the extruder was coated, it was able to consistently meet the diameter requirements. The rod formed well without cracking and had a reasonably uniform diameter (approximately 4.2 to approximately 4.4 millimeters). A rod of 30.5 meters (100 feet) or more was extruded and rolled into reels. Rolled material had good stability, had no cracking or adhesion to itself after more than six months of storage. The extruded rod was tested in direct through feed jets and found to work satisfactorily.

Table 1 Notes for table 1: 1 11% by weight acid, ethylene methacrylic acid copolymer of MI 100, available from E.I. du Pont de Nemours and Company. 2, 10% by weight acid, ethylene methacrylic acid copolymer of MI 500, available from E.I. du Pont de Nemours and Company. 3 Fischer wax - Tropsch (polymethylene) available from Moore & Munger with viscosity, from 10 cp to 120 ° C, MW of 850 and freezing point of 98 ° C. 4 ethylene acrylic acid copolymer available from Allied Signal Corporation having an acid number of 120 (mg KOH / g) which is equal to 15% acid and a viscosity of 650 cp at 140 ° C in Brookfield viscometer. 5 ethylene acrylic acid copolymer available from Allied Signal Corporation having an acid number of 40 (mg.

KOH / g) which is equal to 5% acid and a viscosity of 575 cp at 140 ° C in Brookfield viscometer. 6 Tetrakis antioxidant (methylene (3, 5-di-tert-butyl-4-hydroxyhydrocinnamate)) available from Ciba Geigy Chemical Corporation. 7 titanium dioxide pigment available from E.I. du Pont de Nemours and Company. It is noted that in relation to this date, the best method known by the applicant to carry the In practice, said invention is the conventional one for the manufacture of the objects to which it rs.

Claims (20)

1. REGVUSPICATIONS 'Having described the invention as above, the content of the following claims is claimed as property: 1. A thermal fusion adhesive, characterized in that it consists essentially of the following components: (a) a copolymer of ethylene with an unsaturated carboxylic acid selected from the group consisting of acrylic acid and methacrylic acid having a melt flow index of about 100 dg / minute to about 2000 dg / minute, determined in accordance with the ASTM 1238 condition E standard; (b) a synthetic wax selected from the group consisting of Fischer-Tropsch wax, polyethylene wax and its oxidized counterparts and (c) a high melt flow rate copolymer of ethylene with an unsaturated carboxylic acid selected from the group consists of acrylic acid and methacrylic acid, the high melt flow index copolymer has a melt flow index of at least about 5,000 dg / minute determined according to the standard ASTM 1238 condition E.
2. 2. The adhesive of thermal fusion according to claim 1, characterized in that the copolymer of ethylene with an unsaturated carboxylic acid in component (a) has a melt flow index of about 500 dg / minute.
3. 3. The thermal fusion adhesive according to claim 2, characterized in that the high melt flow rate copolymer of component (c) has a melt flow index of at least about 10,000 dg / minute.
4. 4. A flexible solid thermoplastic adhesive in the form of a rod, strip, strip or the like, for use in a direct feed feed adhesive assortment system, characterized in that it consists essentially of a mixture in the molten state of the following components: ( a) a copolymer of ethylene with an unsaturated carboxylic acid selected from the group consisting of acrylic acid and methacrylic acid having a melt flow index of about 100 dg / minute to about 2000 dg / minute, determined in accordance with the standard ASTM 1238 condition E; (b) a synthetic wax selected from the group consisting of Fischer-Tropsch wax, polyethylene wax and its oxidized counterparts and (c) a high melt flow rate copolymer of ethylene with an unsaturated carboxylic acid selected from the group consists of acrylic acid and methacrylic acid, the high melt flow rate copolymer has a melt flow index of less than about 5,000 dg / minute determined according to the standard ASTM 1238 condition E.
5. 5. The flexible solid thermoplastic adhesive according to claim 4, characterized in that the copolymer of ethylene with an unsaturated carboxylic acid in component (a) has a melt flow rate of approximately 500 dg / minute.
6. 6. The thermal melt adhesive according to claim 4, characterized in that the high melt flow rate copolymer of component (c) has a melt flow index of at least about 10,000 dg / minute.
7. 7. The thermal fusion adhesive according to claim 1, characterized in that on the basis of the total weight of (a), (b) and (c), the adhesive consists essentially of about 50 to about 95% by weight of the component ( a), about 5 to about 30% by weight of component (b) and about 5 to about 30% by weight of component (c).
8. The thermal melt adhesive according to claim 7, characterized in that on the basis of the total weight of (a), (b) and (c), the adhesive consists essentially of about 70 to about 90% by weight of the component ( a), approximately 8 to approximately 20% in weight of component (b) and about 8 to about 20% by weight of component (c).
9. 9. The thermal fusion adhesive according to claim 2, characterized in that on the basis of the total weight of (a), (b) and (c), the adhesive consists essentially of about 50 to about 95% by weight of component (a), about 5 to about 30% by weight of the component (b) and about 5 to about 30% by weight of component (c).
10. 10. The thermal fusion adhesive according to claim 9, characterized in that on the basis of the total weight of (a), (b) and (c), the adhesive consists essentially of about 70 to about 90% by weight of the component ( a), about 8 to about 20% by weight of component (b) and about 8 to about 20% by weight of component (c).
11. The thermal melt adhesive according to claim 3, characterized in that on the basis of the total weight of (a), (b) and (c), the adhesive consists essentially of about 50 to about 95% by weight of the component ( a), about 5 to about 30% by weight of component (b) and about 5 to about 30% by weight of component (c).
12. 12. The thermal fusion adhesive according to claim 11, characterized in that based on the total weight of (a), (b) and (c), the adhesive consists essentially of about 70 to about 90% by weight of component (a), about 8 to about 20% by weight of component (b) and about 8 to about 20% by weight of component (c).
13. 13. The flexible solid thermoplastic adhesive, in the form of a rod, strip, strip or the like, for use in a direct feed feed adhesive assortment system according to claim 4, characterized in that, based on the total weight of the adhesive, (a), (b) and (c), the adhesive consists essentially of about 50 to about 95% by weight of component (a), about 5 to about 30% by weight of component (b) and about 5 to about 30. % by weight of component (c).
14. The flexible solid thermoplastic adhesive according to claim 13, characterized in that on the basis of the total weight of (a), (b) and (c), the adhesive consists essentially of about 70 to about 90% by weight of the component ( a), about 8 to about 20% by weight of component (b) and about 8 to about 20% by weight of component (c).
15. 15. The flexible solid thermoplastic adhesive according to claim 5, characterized in that based on the total weight of (a), (b) and (c), the adhesive consists of essentially from about 50 to about 95% by weight of component (a), about 5 to about 30% by weight of component (b) and about 5 to about 30% by weight of component (c).
16. 16. The flexible solid thermoplastic adhesive according to claim 15, characterized in that on the basis of the total weight of (a), (b) and (c), the adhesive consists essentially of about 70 to about 90% by weight of the component ( a), about 8 to about 20% by weight of component (b) and about 8 to about 20% by weight of component (c).
17. 17. The flexible solid thermoplastic adhesive according to claim 6, characterized in that on the basis of the total weight of (a), (b) and (c), the adhesive "consists essentially of about 50 to about 95% by weight of the component (a), about 5 to about 30% by weight of component (b) and about 5 to about 30% by weight of component (c).
18. 18. The flexible solid thermoplastic adhesive according to claim 17, characterized in that on the basis of the total weight of (a), (b) and (c), the adhesive consists essentially of about 70 to about 90% by weight of the component ( a), about 8 to about 20% by weight of component (b) and about 8 to about 20% by weight of component (c).
19. 19. An adhesive for shoe lining fabric, characterized in that it consists essentially of the flexible adhesive according to claim 4.
20. 20. An adhesive for shoe lining fabric, characterized in that it consists essentially of the flexible adhesive according to claim 14.