CA1042788A - Pesticide and process for its production - Google Patents
Pesticide and process for its productionInfo
- Publication number
- CA1042788A CA1042788A CA228,854A CA228854A CA1042788A CA 1042788 A CA1042788 A CA 1042788A CA 228854 A CA228854 A CA 228854A CA 1042788 A CA1042788 A CA 1042788A
- Authority
- CA
- Canada
- Prior art keywords
- pesticide
- phosphide
- substance
- water
- fibrous substance
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01N—PRESERVATION OF BODIES OF HUMANS OR ANIMALS OR PLANTS OR PARTS THEREOF; BIOCIDES, e.g. AS DISINFECTANTS, AS PESTICIDES OR AS HERBICIDES; PEST REPELLANTS OR ATTRACTANTS; PLANT GROWTH REGULATORS
- A01N59/00—Biocides, pest repellants or attractants, or plant growth regulators containing elements or inorganic compounds
- A01N59/26—Phosphorus; Compounds thereof
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Agronomy & Crop Science (AREA)
- Inorganic Chemistry (AREA)
- Pest Control & Pesticides (AREA)
- Plant Pathology (AREA)
- Health & Medical Sciences (AREA)
- Engineering & Computer Science (AREA)
- Dentistry (AREA)
- General Health & Medical Sciences (AREA)
- Wood Science & Technology (AREA)
- Zoology (AREA)
- Environmental Sciences (AREA)
- Agricultural Chemicals And Associated Chemicals (AREA)
- Chemical Or Physical Treatment Of Fibers (AREA)
- Treatments For Attaching Organic Compounds To Fibrous Goods (AREA)
- Nonwoven Fabrics (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE
"Pesticide and process for its production"
The present invention relates to a pesticide comprising a moulded body made of a water-insoluble organic solid substance in which at least one finely divided metal phosphide is embedded, the moulded body being coated on at least one side with fibrous substance which is permeable to water vapour and whose fibres at least partially extend as far as the embedded phosphide particles and to a process for producing such a pesticide.
"Pesticide and process for its production"
The present invention relates to a pesticide comprising a moulded body made of a water-insoluble organic solid substance in which at least one finely divided metal phosphide is embedded, the moulded body being coated on at least one side with fibrous substance which is permeable to water vapour and whose fibres at least partially extend as far as the embedded phosphide particles and to a process for producing such a pesticide.
Description
~04Z788 The present invention relates to pesticides.
More particularly, the present invention relates to a pesticide comprising a moulded body made of a water-insoluble organic solid substance in which one or more finely divided metal phosphides, preferably aluminium phosphide and/or magnesium phosphide, are embedded and to a process for producing such a pesticide.
French Patent Specification No. 1,531,677 describes moulded bodies, e.g. tablets or pellets, which are used as insecticides. These comprise finely divided metal phosphides, preferably the phosphides of aluminium and magnesium, especially ~` with particle diameters of 10 to 1000 microns, which are embedded in a polyester resin, polyurethane resin, polyvinyl resin or polystyrene resin. These moulded bodies may contain 30 to 60%
by weight of the metal phosphide/phosphides.
The disadvantage of these insecticides is that they give off gas slowly. When brought -into an atmosphere having 60%
` relative humidity at room temperature~ compositions having 60 or 50% by weight of aluminium phosphide and magnesium phosphide and having 40 or 50% by weight of polyester resin~ to some extend, only release the full amount of gas after approximately 20 days.
,.
., .
More particularly, the present invention relates to a pesticide comprising a moulded body made of a water-insoluble organic solid substance in which one or more finely divided metal phosphides, preferably aluminium phosphide and/or magnesium phosphide, are embedded and to a process for producing such a pesticide.
French Patent Specification No. 1,531,677 describes moulded bodies, e.g. tablets or pellets, which are used as insecticides. These comprise finely divided metal phosphides, preferably the phosphides of aluminium and magnesium, especially ~` with particle diameters of 10 to 1000 microns, which are embedded in a polyester resin, polyurethane resin, polyvinyl resin or polystyrene resin. These moulded bodies may contain 30 to 60%
by weight of the metal phosphide/phosphides.
The disadvantage of these insecticides is that they give off gas slowly. When brought -into an atmosphere having 60%
` relative humidity at room temperature~ compositions having 60 or 50% by weight of aluminium phosphide and magnesium phosphide and having 40 or 50% by weight of polyester resin~ to some extend, only release the full amount of gas after approximately 20 days.
,.
., .
-2-104~:788 It is obvious, therefore, that a long time is needed before the residues do not contain any considerable quantities of phosphides and can therefore be removed and eliminated safely, and that the concentration of hydrogen phosphide in the gas-filled room is only very low because of the slow release of gas with a given quantity of the composition.
The present invention seeks to provide pesticides of the type mentioned such that they release gas more quickly and can be removed easily and completely from the gas-filled room after the release of gas.
According to the present invention, this aim may be achieved in that the moulded body ~s coated on one or more sides with a fibrous substance which is permeable to water vapour and whose fibres at least partially extend as far as the embedded phosphide particles.
These fibres which extend to the inside of the moulded bodies act as "wicks", by means of which the atmospheric moisture reaches at least some of the phosphide particles. These particles of the metal phosphides thus decompose with the development of gaseous hydrogen phosphide and with the increase in volume.
Consequently, the water-insoluble organic solid substance around `~ the remaining phosphide particles is shattered and a regulated and quick release of gas takes place.
, ..
~0~ 8~
The pesticides o~ the present invention preferably contain as the water-insoluble or~anicic solid substance a thermoplastic substance, such as polyethylene, polypropylene, hard paraffin, polyvinyl chloride or polyvinyl acetate.
Finely divided aluminium phosphide and/or magnesium phosphide having particle diameters up to 300 ~ have proved to be particularly suitable.
Good results are obtained with pesticides which contain 60 to 120 parts by weight of the water-insoluble organic solid substance per 100 parts by weight of the metal phosphide. The release of gas is too slow when the content of water~insoluble organic solid substance is increased, and it takes place too quickly and even during the coating process with a smaller content.
The fibrous substance which coats the moulded body on one or more sides may, for example, be a fabric, a felt or a non-woven fabric. Fibrous substances made of cellulose, such as cotton fibres, wood pulp, regenerated cellulose or the like are particularly suitable. These substances conduct the atmospheric moisture into the interior of the moulded bodies particularly well.
:
~042788 The pesticide according to the present inventlon is preferably in the shapc of a pl~te, a band or a strip. It is therefore easily possible to bring the respective desirable quantities of the composition into the room which is to be filled with gas, e.g. by cutting off the desired lengths from a band.
The plate, the band or the strip is preferably 3 to 9 mm.
thick.
A particular embodiment of the present invention relates to a process for the production of such a pesticide. The process is characterised in that a layer comprising a mixture of the at least one finely divided metal phosphide and the water-insoluble organic solid substance is applied to a layer of the fibrous substance, the whole being then heated to such a high temperature and for so long that a moulded body is produced from the water-insoluble organic substance and the at least one phosphide and this moulded body becomes joined to~the layer of the fibrous substance.
Thus, the whole may, for example, be heated at a ~ temperature of from approximately 140 to 160C and for a time - 20 of from approximately 3 to 8 minutes.
If it is desirable to produce a layered body which is coated with a fibrous substance on two sides, then a second layer of a fibrous substance is rolled onto the moulded body when it is warm.
.
~04Z78(~
The process may bc carried out continuously or discontinuously.
The pesticides of the present invention may be used to fill, with gas, rooms where there may even be, for example, cereals, tobacco, foodstuffs or luxury foodstuffs. The hydrogen phosphide which has been developed destroys all pests such as insects or rodents.
The present invention will now be further described with reference to the following Example:-EXAMPLE
A layer, approximately 7 mm thick, of aluminiumphosphide having particle diameters of 10 to 300~ and granulated polyvinyl acetate in the weight ratio of 80 parts of polyvinyl acetate~ containing plasticizers, to 100 parts of aluminium phosphide is applied to a layer, 0.2 mm thick, of non-woven fabric comprising cellulose fibres. The whole is heated to 160 C for approximately 5 minutes by means of an infra-red radiator.
A second layer of the non-woven fabric, which serves as the underneath layer~ is rolled onto the surface of the moulded body thus produced, when it is hot, by means of a roller heated to approximately 150C and for a period of approximately 1 minute. A plate which is 4 mm. thick is produced.
. ~ .
~Q4Z7~1 l~en this moulded body i9 brought into an atmosphere of 65% relative humidity st a room temperature of 20 C., gas is released from the phosphide contained in the composition at the rate of 1.2% after 2 hours, 9.5% after 5 hours and 21%
after 10 hours, the greatest possible release of gas being achieved after 72 hours.
~ he present invention will now be further illustrated by way of the accompanying drawing which shows, on an enlarged scale, a section through a pesticide according to the present invention.
Particles 2 of aluminium phosphide are embedded in a plate 1 comprising polyvinyl acetate. On the surface there is a non-woven fabric 3 comprising cellulose fibres whose fibres extend to a portion of the embedded phosphide particles.
, .~..
.
' ~
The present invention seeks to provide pesticides of the type mentioned such that they release gas more quickly and can be removed easily and completely from the gas-filled room after the release of gas.
According to the present invention, this aim may be achieved in that the moulded body ~s coated on one or more sides with a fibrous substance which is permeable to water vapour and whose fibres at least partially extend as far as the embedded phosphide particles.
These fibres which extend to the inside of the moulded bodies act as "wicks", by means of which the atmospheric moisture reaches at least some of the phosphide particles. These particles of the metal phosphides thus decompose with the development of gaseous hydrogen phosphide and with the increase in volume.
Consequently, the water-insoluble organic solid substance around `~ the remaining phosphide particles is shattered and a regulated and quick release of gas takes place.
, ..
~0~ 8~
The pesticides o~ the present invention preferably contain as the water-insoluble or~anicic solid substance a thermoplastic substance, such as polyethylene, polypropylene, hard paraffin, polyvinyl chloride or polyvinyl acetate.
Finely divided aluminium phosphide and/or magnesium phosphide having particle diameters up to 300 ~ have proved to be particularly suitable.
Good results are obtained with pesticides which contain 60 to 120 parts by weight of the water-insoluble organic solid substance per 100 parts by weight of the metal phosphide. The release of gas is too slow when the content of water~insoluble organic solid substance is increased, and it takes place too quickly and even during the coating process with a smaller content.
The fibrous substance which coats the moulded body on one or more sides may, for example, be a fabric, a felt or a non-woven fabric. Fibrous substances made of cellulose, such as cotton fibres, wood pulp, regenerated cellulose or the like are particularly suitable. These substances conduct the atmospheric moisture into the interior of the moulded bodies particularly well.
:
~042788 The pesticide according to the present inventlon is preferably in the shapc of a pl~te, a band or a strip. It is therefore easily possible to bring the respective desirable quantities of the composition into the room which is to be filled with gas, e.g. by cutting off the desired lengths from a band.
The plate, the band or the strip is preferably 3 to 9 mm.
thick.
A particular embodiment of the present invention relates to a process for the production of such a pesticide. The process is characterised in that a layer comprising a mixture of the at least one finely divided metal phosphide and the water-insoluble organic solid substance is applied to a layer of the fibrous substance, the whole being then heated to such a high temperature and for so long that a moulded body is produced from the water-insoluble organic substance and the at least one phosphide and this moulded body becomes joined to~the layer of the fibrous substance.
Thus, the whole may, for example, be heated at a ~ temperature of from approximately 140 to 160C and for a time - 20 of from approximately 3 to 8 minutes.
If it is desirable to produce a layered body which is coated with a fibrous substance on two sides, then a second layer of a fibrous substance is rolled onto the moulded body when it is warm.
.
~04Z78(~
The process may bc carried out continuously or discontinuously.
The pesticides of the present invention may be used to fill, with gas, rooms where there may even be, for example, cereals, tobacco, foodstuffs or luxury foodstuffs. The hydrogen phosphide which has been developed destroys all pests such as insects or rodents.
The present invention will now be further described with reference to the following Example:-EXAMPLE
A layer, approximately 7 mm thick, of aluminiumphosphide having particle diameters of 10 to 300~ and granulated polyvinyl acetate in the weight ratio of 80 parts of polyvinyl acetate~ containing plasticizers, to 100 parts of aluminium phosphide is applied to a layer, 0.2 mm thick, of non-woven fabric comprising cellulose fibres. The whole is heated to 160 C for approximately 5 minutes by means of an infra-red radiator.
A second layer of the non-woven fabric, which serves as the underneath layer~ is rolled onto the surface of the moulded body thus produced, when it is hot, by means of a roller heated to approximately 150C and for a period of approximately 1 minute. A plate which is 4 mm. thick is produced.
. ~ .
~Q4Z7~1 l~en this moulded body i9 brought into an atmosphere of 65% relative humidity st a room temperature of 20 C., gas is released from the phosphide contained in the composition at the rate of 1.2% after 2 hours, 9.5% after 5 hours and 21%
after 10 hours, the greatest possible release of gas being achieved after 72 hours.
~ he present invention will now be further illustrated by way of the accompanying drawing which shows, on an enlarged scale, a section through a pesticide according to the present invention.
Particles 2 of aluminium phosphide are embedded in a plate 1 comprising polyvinyl acetate. On the surface there is a non-woven fabric 3 comprising cellulose fibres whose fibres extend to a portion of the embedded phosphide particles.
, .~..
.
' ~
Claims (24)
1. A pesticide comprising a moulded body made of 60 to 120 parts by weight of a water-insoluble organic solid substance in which at least 100 parts by weight of at least one finely divided metal phosphide are embedded, the moulded body being coated on at least one side with a fibrous substance which is permeable to water vapour and whose fibres at least partially extend as far as the embedded phosphide particles.
2. A pesticide as claimed in claim 1, in which the water-insoluble organic solid substance is a thermo-plastic substance.
3. A pesticide as claimed in claim 2, in which the thermoplastic substance is selected from the group consisting of polyethylene, polypropylene, polyvinyl chlo-ride, polyvinyl acetate and hard paraffin.
4. A pesticide as claimed in claim 1, in which the at least one finely divided metal phosphide is selected from the group consisting of aluminum phosphide and magnesium phosphide.
5. A pesticide as claimed in claim 4, in which the aluminum phosphide and magnesium phosphide have particle diameters up to 300 u.
6. A pesticide as claimed in claim 1, in which the water-insoluble organic solid substance is present in an amount of 60 to 120 parts by weight per 100 parts by weight of the metal phosphide.
7. A pesticide as claimed in claim 1, in which the fibrous substance is selected from the group consisting of a fabric, a felt and a non-woven fabric.
8. A pesticide as claimed in claim 1, in which the fibrous substance comprises at least partially cellulose fibres.
9. A pesticide as claimed in claim 8, in which the fibrous substance comprises wholly cellulose fibres.
10. A pesticide as claimed in claim 1, which is in a form selected from a plate, a band and a strip.
11. A pesticide as claimed in claim 10, in which the form is 3 to 9 mm. thick.
12. A process for producing a pesticide as claimed in claim 1, in which process a layer comprising a mixture of the at least one finely divided metal phosphide and the water-insoluble organic solid substance is applied to a layer of the fibrous substance, and the whole is then heated to a sufficiently high temperature and for a sufficient length of time so that a moulded body is produced from the water-insoluble organic substance and the at least one phosphide and this moulded body becomes joined to the layer of the fibrous substance.
13. A process as claimed in claim 12, in which the said whole is heated to a temperature of from approximately 140 to 160°C.
14. A process as claimed in claim 12, in which the said whole is heated for a period of from approximately 3 to 8 minutes.
15. A process as claimed in claim 12, in wich a second layer of a fibrous substance is rolled onto the moulded body when it is warm.
16. A process as claimed in claim 12, in which the water-insoluble organic solid substance is a thermoplastic substance.
17. A process as claimed in claim 16, in which the thermoplastic substance is selected from the group consisting of polyethylene, polypropylene, polyvinyl chloride, polyvinyl acetate and hard paraffin.
18. A process as claimed in claim 12, in which the at least one finely divided metal phosphide is selected from the group consisting of aluminium phosphide and magnesium phosphide.
19. A process as claimed in claim 18, in which the aluminium phosphide and magnesium phosphide have particle diameters up to 300µ.
20. A process as claimed in claim 12, in which the fibrous substance is selected from the group consisting of a felt, a fabric and a non-woven fabric.
21. A process as claimed in claim 12, in which the fibrous substance comprises at least partially cellulose fibres.
22. A process as claimed in claim 21, in which the fibrous substance comprises wholly cellulose fibres.
23. A process as claimed in claim 12, in which the pesticide is in a form selected from a plate, a band and a strip.
24. A process as claimed in claim 23, in which the form is 3 to 9 mm thick.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE2454172A DE2454172C3 (en) | 1974-11-15 | 1974-11-15 | Pesticides and processes for their production Degesch GmbH, 6000 Frankfurt |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1042788A true CA1042788A (en) | 1978-11-21 |
Family
ID=5930886
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA228,854A Expired CA1042788A (en) | 1974-11-15 | 1975-06-09 | Pesticide and process for its production |
Country Status (17)
| Country | Link |
|---|---|
| JP (1) | JPS5157819A (en) |
| AR (1) | AR209611A1 (en) |
| AT (1) | AT346128B (en) |
| BE (1) | BE834630A (en) |
| BG (1) | BG27051A3 (en) |
| BR (1) | BR7507240A (en) |
| CA (1) | CA1042788A (en) |
| DE (1) | DE2454172C3 (en) |
| EG (1) | EG11814A (en) |
| ES (1) | ES438819A1 (en) |
| FR (1) | FR2290843A1 (en) |
| GB (1) | GB1506049A (en) |
| IL (1) | IL47521A (en) |
| RO (1) | RO70062A (en) |
| TR (1) | TR18576A (en) |
| YU (1) | YU41556B (en) |
| ZA (1) | ZA753865B (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2825534C2 (en) * | 1978-06-10 | 1983-11-24 | Degesch Gmbh, 6000 Frankfurt | Vertebrate control tablet |
| DE7906765U1 (en) * | 1979-03-10 | 1979-07-05 | Haufe Ludwig | Pesticide Pouch |
| GB2139498B (en) * | 1983-04-19 | 1987-12-09 | Family Products Sendirian Berh | Insect repellant device |
| DE3325826A1 (en) * | 1983-07-18 | 1985-01-31 | Dr. Werner Freyberg Chemische Fabrik Delitia Nachf., 6941 Laudenbach | BAG FOR INCLUDING OUTGASSING PEST CONTROL |
| JPH0483052U (en) * | 1990-11-29 | 1992-07-20 |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| IL33844A (en) * | 1969-02-08 | 1973-06-29 | Gmbh Fuer Schaedlingsbekaempfu | Pesticidal gas generating compositions and their manufacture |
-
1974
- 1974-11-15 DE DE2454172A patent/DE2454172C3/en not_active Expired
-
1975
- 1975-06-06 GB GB24347/75A patent/GB1506049A/en not_active Expired
- 1975-06-09 CA CA228,854A patent/CA1042788A/en not_active Expired
- 1975-06-17 ZA ZA00753865A patent/ZA753865B/en unknown
- 1975-06-17 TR TR18576A patent/TR18576A/en unknown
- 1975-06-19 IL IL47521A patent/IL47521A/en unknown
- 1975-06-24 ES ES438819A patent/ES438819A1/en not_active Expired
- 1975-07-02 JP JP50081737A patent/JPS5157819A/en active Granted
- 1975-07-04 AR AR259488A patent/AR209611A1/en active
- 1975-07-17 FR FR7522393A patent/FR2290843A1/en active Granted
- 1975-07-20 EG EG430/75A patent/EG11814A/en active
- 1975-07-22 RO RO7582935A patent/RO70062A/en unknown
- 1975-07-23 YU YU1871/75A patent/YU41556B/en unknown
- 1975-09-16 AT AT710475A patent/AT346128B/en not_active IP Right Cessation
- 1975-10-01 BG BG7531140A patent/BG27051A3/xx unknown
- 1975-10-17 BE BE161042A patent/BE834630A/en not_active IP Right Cessation
- 1975-11-04 BR BR7507240*A patent/BR7507240A/en unknown
Also Published As
| Publication number | Publication date |
|---|---|
| RO70062A (en) | 1981-11-24 |
| AR209611A1 (en) | 1977-05-13 |
| FR2290843A1 (en) | 1976-06-11 |
| DE2454172A1 (en) | 1976-05-20 |
| IL47521A (en) | 1978-09-29 |
| ES438819A1 (en) | 1977-02-01 |
| JPS5157819A (en) | 1976-05-20 |
| ATA710475A (en) | 1978-02-15 |
| GB1506049A (en) | 1978-04-05 |
| BE834630A (en) | 1976-02-16 |
| DE2454172C3 (en) | 1979-05-10 |
| AU8239575A (en) | 1977-01-06 |
| BG27051A3 (en) | 1979-08-15 |
| EG11814A (en) | 1977-12-31 |
| YU187175A (en) | 1984-02-29 |
| ZA753865B (en) | 1976-05-26 |
| AT346128B (en) | 1978-10-25 |
| JPS5543442B2 (en) | 1980-11-06 |
| YU41556B (en) | 1987-10-31 |
| DE2454172B2 (en) | 1978-09-21 |
| FR2290843B1 (en) | 1979-08-03 |
| BR7507240A (en) | 1976-08-10 |
| IL47521A0 (en) | 1975-08-31 |
| TR18576A (en) | 1977-04-13 |
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