Patent US4421742A successfully refreshed from Google Patents.
US4421742A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Phosphine producing pesticide and method of manufacture therefor
Assignee: Dr Werner Freyberg Chemische Fabrik Delitia Nachf GmbH and Co Kg
•
Filing: 1981-03-04
•
Granted: 1983-12-20
•
Expires: 2001-03-04
Abstract
Abstract A pesticide composition comprising a particulate hydrolyzable metal phosphide is rendered liquid phase water repellent by treating particles of the composition with a silicon-organic compound. The silicon-organic compound has at least one reactive moiety, preferably hydrogen capable of reacting with and binding to reactive sites contained on surfaces of particles of the composition. Preferably, the reactive group is hydrogen and the reactive site is a hydroxy group. The silicon-organic compound can also undergo cross-linking reactions. In the water-repellent treatment the silicon-organic compound may be applied to and be reacted to become bonded to any of the solid ingredients of the composition, including urea which serves as a self-ignition inhibitor. Preferably at least part of the silicon-organic compound is bonded to particles of the metal phosphide. Advantages result if all the silicon-organic compound is thus bound to the metal phosphide. On the phosphide surfaces novel metal-silicone compounds may form. The treatment protects the phoshide against access of liquid state water and resulting violent reaction, without inhibiting the access of water in its gaseous state (e.g. atmospheric moisture) required for the generation of phosphine when the composition is used as a fumigant. The hydrophobing reaction of the silicon-organic compound, e.g. polymethyl hydrogen siloxane is promoted by heat or catalysts (metal organic compounds, bases, e.g. ammonia, ammonium compounds, amines). The composition in powder form (enclosed in gas permeable sachets) or in tablets may contain additives, e.g. self-ignition inhibitors such as ammonium carbamate, ammonium carbonate and urea.
Inventors
- 👤 Wolfgang F. R. Friemel
- 👤 Werner O. Praxl
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 17:27
CPC Classifications
A; A01; A01N; A01N59/00; A01N59/26
Claims Analysis
Total Claims: 44
Claim 1
Independent Claim
111 words
In a phosphine producing pesticide composition comprising a mixture of a pesticidally effective amount of particles of a hydrolyzable metal phosphide and particles of a self-ignition inhibitor in an amount effective to protect the composition against spontaneous combustion of phosphine released from the composition, and which is hydrophobized so as to render the composition sufficiently repellant to liquid water to reduce the likelihood of spontaneous combustion upon contact therewith, the improvement wherein the composition is hydrophobized by a silicon-organic compound chemically bonded to the surface of at least the particles of the metal phosphide and present in an amount from about 0.1% to about 3% by weight of the pesticide composition.
Claim 2
Dependent Claim
111 words
In a phosphine producing pesticide composition comprising a mixture of a pesticidally effective amount of particles of a hydrolyzable metal phosphide and particles of a self-ignition inhibitor in an amount effective to protect the composition against spontaneous combustion of phosphine released from the composition, and which is hydrophobized so as to render the composition sufficiently repellant to liquid water to reduce the likelihood of spontaneous combustion upon contact therewith, the improvement wherein the composition is hydrophobized by a silicon-organic compound chemically bonded to the surface of at least the particles of the metal phosphide and present in an amount from about 0.1% to about 3% by weight of the pesticide composition.
Claim 3
Dependent Claim
30 words
A composition according to claim 1 wherein the silicon-organic compound is bonded to the surface of both the particles of the metal phosphide and the particles of the self-ignition inhibitor.
Claim 4
Dependent Claim
23 words
A composition according to claim 1 wherein the silicon-organic compound is bonded to only the surface of the particles of the metal phosphide.
Claim 5
Dependent Claim
11 words
A composition according to claim 1 in tablet or pellet form.
Claim 6
Dependent Claim
19 words
The composition according to claim 1 wherein the inhibitor is ammonium carbonate, ammonium carbonate, urea or a mixture thereof.
Claim 7
Dependent Claim
17 words
The composition according to claim 5 wherein the inhibitor is a mixture of ammonium carbonate and urea.
Claim 8
Dependent Claim
74 words
The composition according to claim 1 wherein the silicon-organic compound has structural units of the formula: ##STR4## wherein each R 2 is a member of the group consisting of alkyl and aryl, each of a molecular weight of less than 150; at least one x, y and z is a hydrogen atom and the remainder are R 2 ; and m, n and o are whole numbers whose sum is between 10 and 1000.
Claim 9
Dependent Claim
33 words
The composition according to claim 1 wherein the metal phosphide is aluminum phosphide and the composition is hydrophobized by the reaction of methylhydrogenpolysiloxane on at least the surface of the aluminum phosphide particles.
Claim 10
Dependent Claim
24 words
The composition according to claim 8 wherein the methylhydrogenpolysiloxane has a viscosity at 70° F. of between about 10 centipose and about 1000 centipoise.
Claim 11
Dependent Claim
20 words
The composition according to claim 9 wherein the amount of methylhydrogenpolysiloxane is 0.2% to 0.5% by weight of said composition.
Claim 12
Dependent Claim
45 words
The composition according to claim 1 prepared from 89 to 56% by weight technical grade aluminum phosphide; 5 to 25% by weight urea; 5 to 15% by weight ammonium carbamate; and 0.1 to 3.0% by weight methylhydrogenpolysiloxane; and any balance, one or more tableting aids.
Claim 13
Dependent Claim
39 words
The composition according to claim 11, prepared from about 63.5%- 69.5% by weight technical grade aluminum phosphide and 20% by weight urea, rendered hydrophobic by 0.5% by weight of the composition of methylhydrogenpolysiloxane; and 10% by weight ammonium carbamate.
Claim 14
Dependent Claim
35 words
The composition according to claim 1, wherein the metal phosphide is aluminum phosphide and the composition is hydrophobized by the reaction of a reactive silicon-organic compound on the surface only of the metal phosphide particles.
Claim 15
Dependent Claim
45 words
A composition according to claim 13, prepared from 89 to 56% by weight technical grade aluminum phosphide; 5 to 25% by weight urea; 5 to 15% by weight ammonium carbamate; and 0.1 to 3.0% by weight methylhydrogenpolysiloxane; and any balance, one or more tableting aids.
Claim 16
Dependent Claim
42 words
The composition according to claim 1 wherein the metal phosphide is aluminum phosphide and the composition is hydrophobized by the reaction of the reactive silicon-organic compound on the surfaces of a mixture of particles of the inhibitor and of the metal phosphide.
Claim 17
Dependent Claim
11 words
The composition according to claim 15 wherein the inhibitor comprises urea.
Claim 18
Dependent Claim
45 words
A composition according to claim 15, prepared from 89 to 56% by weight technical grade aluminum phoshide; 5 to 25% by weight urea; 5 to 15% by weight aluminum carbamate; and 0.1 to 3.0% by weight methylhydrogenpolysiloxane; and any balance, one or more tableting aids.
Claim 19
Dependent Claim
62 words
A process for the production of a pesticide composition according to claim 1 which comprises the steps of reacting on the surface of unhydrophobized particles of a metal phosphide, either prior to or after admixture thereof with self-ignition inhibitor, an amount from about 0.1 to 3.0% by weight of the composition of reactive silicon-organic compound effective to render the pesticidal composition hydrophobic.
Claim 20
Dependent Claim
22 words
A process according to claim 18 wherein the hydrophobized mixture of metal phosphide and inhibitor is thereafter formed into tablets or pellets.
Claim 21
Dependent Claim
19 words
A process according to claim 18 wherein the inhibitor is ammonium carbonate, ammonium carbamate, urea or a mixture thereof.
Claim 22
Dependent Claim
17 words
A process according to claim 20 wherein the inhibitor is a mixture of ammonium carbamate and urea.
Claim 23
Dependent Claim
74 words
A process according to claim 18 wherein the silicon-organic compound has structural units of the formula: ##STR5## wherein each R 2 is a member of the group consisting of alkyl and aryl, each of a molecular weight of less than 150; at least one x, y and z is a hydrogen atom and the remainder are R 2 ; and m, n and o are whole numbers whose sum is between 10 and 1000.
Claim 24
Dependent Claim
18 words
A process according to claim 18 wherein a portion or all of the reactive silicon-organic compound is methylhydrogenpolysiloxane.
Claim 25
Dependent Claim
24 words
A process according to claim 23 wherein the methylhydrogenpolysiloxane has a viscosity at 70° F. of between about 10 centipoise and about 1000 centipoise.
Claim 26
Dependent Claim
20 words
A process according to claim 24 wherein the amount of methylhydrogenpolysiloxane is 0.2% to 0.5% by weight of said composition.
Claim 27
Dependent Claim
45 words
A process according to claim 18 prepared from 89 to 56% by weight technical grade aluminum phosphide; 5 to 25% by weight urea; 5 to 15% by weight ammonium carbamate; and 0.1 to 3.0% by weight methylhydrogenpolysiloxane; and any balance, one or more tableting aids.
Claim 28
Dependent Claim
42 words
A process according to claim 26 wherein the composition is prepared from about 63.5%-69.5% by weight technical grade aluminum phosphide and 20% by weight urea, rendered hydrophobic by 0.5% by weight of the composition of methylhydrogenpolysiloxane; and 10% by weight ammonium carbamate.
Claim 29
Dependent Claim
25 words
A process according to claim 18 wherein the reaction with the reactive silicon-organic compound is conducted only on the surface of the metal phosphide particles.
Claim 30
Dependent Claim
49 words
A process according to claim 28 wherein the composition is prepared from 89 to 56% by weight technical grade aluminum phosphide; 5 to 25% by weight urea; 5 to 15% by weight ammonium carbamate; and 0.1 to 3.0% by weight methylhydrogenpolysiloxane; and any balance, one or more tableting aids.
Claim 31
Dependent Claim
32 words
A process according to claim 18 wherein the reaction with the reactive silicon-organic compound is conducted on the surfaces of a mixture of particles of the inhibitor and of the metal phosphide.
Claim 32
Dependent Claim
11 words
A process according to claim 30 wherein the inhibitor comprises urea.
Claim 33
Dependent Claim
49 words
A process according to claim 30 wherein the composition is prepared from 89 to 56% by weight technical grade aluminum phosphide; 5 to 25% by weight urea; 50 to 15% by weight ammonium carbamate; and 0.1 to 3.0% by weight methylhydrogenpolysiloxane; and any balance, one or more tableting aids.
Claim 34
Dependent Claim
25 words
A process according to claim 18 wherein the reaction of the reactive silicon-organic compound is conducted in the presence of a catalyst for the reaction.
Claim 35
Dependent Claim
14 words
A process according to claim 33 wherein the catalyst is a metal organic compound.
Claim 36
Dependent Claim
27 words
A process according to claim 34 wherein the catalyst is employed in an amount from about 1% to about 10% by weight of the reactive silicon-organic compound.
Claim 37
Dependent Claim
18 words
A process according to claim 33 wherein the reaction is catalyzed by conducting the reaction under basic conditions.
Claim 38
Dependent Claim
22 words
A process according to claim 34 wherein the reaction is conducted in the presence of and is catalyzed by the ignition inhibitor.
Claim 39
Dependent Claim
14 words
A process according to claim 33 wherein the reaction is catalyzed by ammonium carbamate.
Claim 40
Dependent Claim
29 words
A process according to claim 38 wherein the catalyst is employed in an amount from about one to five times by weight the amount of the reactive silicon-organic compound.
Claim 41
Dependent Claim
15 words
A process according to claim 18 wherein the reaction is conducted at an elevated temperature.
Claim 42
Dependent Claim
19 words
A process according to claim 40 wherein the reaction is conducted at a temperature of 80° to 200° C.
Claim 43
Dependent Claim
43 words
A method of controlling pests in an environment susceptible to infestation by such pests which comprises exposing to water in that environment an amount effective to generate a pesticidally toxic amount of phosphine gas in that environment of a composition of claim 1.
Claim 44
Dependent Claim
35 words
A method according to claim 42 wherein the water is in the form of water vapor and the phosphine gas thus produced is introduced into and maintained in an environment susceptible to infestation by pests.
References Cited (Backward Citations)
CA888149A
Cited
US2117158A
Cited
US2826486A
Cited
US2826527A
Cited
US2793979A
Cited
GB824107A
Cited
US2809916A
Cited
US2987445A
Cited
US3132067A
Cited
US3159536A
Cited
US3179589A
Cited
US3372088A
Cited
US3624198A
Cited
US3719751A
Cited
ZA755587B
Cited
US4347241A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-12-19 | 1987-06-20 | 1987-12-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-12-19 | 1991-06-20 | 1991-12-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-12-19 | 1995-06-20 | 1995-12-20 | $7700.00 | Window Closed / Lapsed |