US4347241A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Delayed release coated metal phosphide pesticides
Assignee: Degesch GmbH
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Filing: 1978-03-01
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Granted: 1982-08-31
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Expires: 1998-03-01
Abstract
Abstract A pest control product is provided from a metal phosphide particle coated with a water soluble coating that has been rendered water repellent. The coating also contains a material which will chemically or physically disintegrate to cause apertures in the coating to provide access for water to the phosphide particles.
Inventors
- 👤 Wolfgang Kapp
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 16:49
CPC Classifications
A; A01; A01N; A01N59/00; A01N59/26
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
138 words
A composition for pest control by fumigation including a metal phosphide, selected from the group consisting of aluminum phosphide, magnesium phosphide and calcium phosphide, dry-coated with a composition composed of urea, which urea has first been rendered water-repellent by treatment in a non-polar organic solvent with a water-repellent poly(methyl hydrogen)siloxane substance in the presence of air and an organometallic catalyst of a noble transition metal of Group VIII of the Periodic Table, or of tin, said coating composition also including a substance which is chemically or physically modifiable or decomposable to cause apertures to be formed in the coating under predetermined conditions for access of water or water vapor to the phosphide particles, said modifiable or decomposable substance being selected from the group consisting of ammonium carbamate, ammonium carbonate, sodium bicarbonate, ammonium bicarbonate, ammonium cyanide and potassium bicarbonate.
Claim 2
Dependent Claim
138 words
A composition for pest control by fumigation including a metal phosphide, selected from the group consisting of aluminum phosphide, magnesium phosphide and calcium phosphide, dry-coated with a composition composed of urea, which urea has first been rendered water-repellent by treatment in a non-polar organic solvent with a water-repellent poly(methyl hydrogen)siloxane substance in the presence of air and an organometallic catalyst of a noble transition metal of Group VIII of the Periodic Table, or of tin, said coating composition also including a substance which is chemically or physically modifiable or decomposable to cause apertures to be formed in the coating under predetermined conditions for access of water or water vapor to the phosphide particles, said modifiable or decomposable substance being selected from the group consisting of ammonium carbamate, ammonium carbonate, sodium bicarbonate, ammonium bicarbonate, ammonium cyanide and potassium bicarbonate.
Claim 3
Dependent Claim
12 words
The composition of claim 1 wherein the metal phosphide is aluminum phosphide.
Claim 4
Dependent Claim
141 words
In a tablet for pest control for fumigation, said tablet including a metal phosphide selected from the group consisting of aluminum phospide, magnesium phosphide and calcium phosphide and a coating substance which can be decomposed to cause apertures to be formed in the tablet for access to the phosphide, said substance including a member selected from the group consisting of ammonium carbamate, ammonium carbonate, sodium bicarbonate, ammonium bicarbonate, ammonium cyanide and potassium bicarbonate, the improvement comprising employing as the coating for the metal phosphide a composition of urea which has first been rendered water-repellent by treatment in a non-polar organic solvent a water-repellent poly(methyl hydrogen)siloxane in the presence of air and an organometallic catalyst of a noble transition metal of Group VIII of the Periodic Table, or of tin, which coating composition is dry-mixed with said phosphide to coat the same.
Claim 5
Dependent Claim
141 words
In a tablet for pest control for fumigation, said tablet including a metal phosphide selected from the group consisting of aluminum phospide, magnesium phosphide and calcium phosphide and a coating substance which can be decomposed to cause apertures to be formed in the tablet for access to the phosphide, said substance including a member selected from the group consisting of ammonium carbamate, ammonium carbonate, sodium bicarbonate, ammonium bicarbonate, ammonium cyanide and potassium bicarbonate, the improvement comprising employing as the coating for the metal phosphide a composition of urea which has first been rendered water-repellent by treatment in a non-polar organic solvent a water-repellent poly(methyl hydrogen)siloxane in the presence of air and an organometallic catalyst of a noble transition metal of Group VIII of the Periodic Table, or of tin, which coating composition is dry-mixed with said phosphide to coat the same.
Claim 6
Dependent Claim
11 words
A tablet consisting of the materials set forth in claim 1.
Claim 7
Dependent Claim
20 words
A tablet according to claim 4 wherein the urea is coated with 4 to 18% of its weight said polysiloxane.
Claim 8
Independent Claim
85 words
A method of preparing a controlled-release pesticide consisting essentially in mixing a solution in a non-polar organic solvent of poly(methyl hydrogen)siloxane with a catalytically active organometallic compound of a noble transition metal of Group VIII of the Periodic Table, or of tin, together with particulate solid urea crystals in the presence of atmospheric oxygen to form a poly(methyl hydrogen)siloxane hydrophobized urea composition, and thereafter dry-mixing a metal phosphide and a decomposable gas-release substance with said hydrophobized urea composition to form a coated metal phosphide composition.
Claim 9
Independent Claim
85 words
A method of preparing a controlled-release pesticide consisting essentially in mixing a solution in a non-polar organic solvent of poly(methyl hydrogen)siloxane with a catalytically active organometallic compound of a noble transition metal of Group VIII of the Periodic Table, or of tin, together with particulate solid urea crystals in the presence of atmospheric oxygen to form a poly(methyl hydrogen)siloxane hydrophobized urea composition, and thereafter dry-mixing a metal phosphide and a decomposable gas-release substance with said hydrophobized urea composition to form a coated metal phosphide composition.
Claim 10
Dependent Claim
24 words
The process according to claim 6, further including the step of compressing said composition into a molded body of the form of a tablet.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-08-30 | 1986-03-01 | 1986-08-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-08-30 | 1990-03-01 | 1990-08-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-08-30 | 1994-03-01 | 1994-08-31 | $7700.00 | Window Closed / Lapsed |