US4267280A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Controlled release pesticides and method of preparation
Assignee: HOPKINS MADISON WISCONSIN A CORP OF WISCONSIN
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Filing: 1979-07-20
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Granted: 1981-05-12
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Expires: 1999-07-20
Abstract
Abstract Pesticide polymers comprising a polymer with a macromolecular backbone and pendant groups having pesticidal groups chemically linked thereto are prepared by reacting a pesticide having a replaceable hydrogen with a multifunctional isocyanate to form a pesticide-isocyanate adduct and then reacting the adduct with the polymer substrate in a mutual solvent to form the pesticide polymers. The chemical linkages connecting the pesticide-adduct to the pendant groups are cleaved under environmental conditions of use to controllably release an effective amount of the active pesticide.
Inventors
- 👤 Charles L. McCormick
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 21:58
CPC Classifications
A; A01; A01N; A01N25/00; A01N25/08; A01N25/10; C; C08; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/2805; C08G18/40; C08G18/62; C08G18/6212; C08G18/70; C08G18/72; C08G18/80; C08G18/8061
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
88 words
A pesticide polymer, which has a macromolecular backbone with pendant pesticidal groups chemically linked thereto by linkages which are broken under environmental conditions of use to controllably release an effective amount of active pesticide, is prepared by reacting a pesticide having a replaceable hydrogen with a multifunctional organic isocyanate to form a pesticide-isocyanate adduct and then reacting the adduct with a polymer having pendant groups containing a replaceable hydrogen, to form linkages which are cleaved under enviromental conditions of use to controllably release an effective amount of pesticide.
Claim 2
Dependent Claim
88 words
A pesticide polymer, which has a macromolecular backbone with pendant pesticidal groups chemically linked thereto by linkages which are broken under environmental conditions of use to controllably release an effective amount of active pesticide, is prepared by reacting a pesticide having a replaceable hydrogen with a multifunctional organic isocyanate to form a pesticide-isocyanate adduct and then reacting the adduct with a polymer having pendant groups containing a replaceable hydrogen, to form linkages which are cleaved under enviromental conditions of use to controllably release an effective amount of pesticide.
Claim 3
Dependent Claim
21 words
The pesticide polymer of claim 1 in which the replaceable hydrogen of the polymer is derived from a pendant hydroxyl group.
Claim 4
Dependent Claim
34 words
The pesticide polymer of claim 1 in which the replaceable hydrogen of the pesticide is derived from a group selected from hydroxyl, sulfyhydryl, amino, imino, carboxyl, amido, sulfonamido, sulfonimido, phosphoramido, phosphorimido, thiophosphoramido, and thiophosphorimido.
Claim 5
Dependent Claim
11 words
A pesticide-polymer of claim 1 in which the pesticide is 4-amino-6-tert-butyl-3-(methylthio)-as-triazin-5(4H)-one.
Claim 6
Dependent Claim
12 words
A pesticide-polymer of claim 1 in which the polymer is polyvinyl alcohol.
Claim 7
Independent Claim
86 words
The method of preparing a pesticide-polymer for the controlled release of pesticide under field of use conditions which comprises reacting a pesticide having a replaceable hydrogen with a multifunctional organic isocyanate to form a pesticide-isocyanate adduct and then reacting the adduct with a polymer having pendant groups containing a replaceable hydrogen to form a pesticide-polymer in which the pesticide is linked chemically to the pendant groups by linkages which are cleaved under environmental conditions of use to controllably release an effective amount of the active pesticide.
Claim 8
Independent Claim
86 words
The method of preparing a pesticide-polymer for the controlled release of pesticide under field of use conditions which comprises reacting a pesticide having a replaceable hydrogen with a multifunctional organic isocyanate to form a pesticide-isocyanate adduct and then reacting the adduct with a polymer having pendant groups containing a replaceable hydrogen to form a pesticide-polymer in which the pesticide is linked chemically to the pendant groups by linkages which are cleaved under environmental conditions of use to controllably release an effective amount of the active pesticide.
Claim 9
Dependent Claim
18 words
The method of claim 6 in which the replaceable hydrogen of the polymer is derived from hydroxyl groups.
Claim 10
Dependent Claim
23 words
The method of claim 6 in which the reaction is carried out in a mutual solvent for the polymer and the pesticide-isocyanate adduct.
Claim 11
Dependent Claim
12 words
The method of claim 1 in which the pesticide is 4-amino-6-tert-butyl-3-(methylthio)-as-triazin-5(4H) one.
Claim 12
Dependent Claim
12 words
The method of claim 1 in which the polymer is polyvinyl alcohol.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-05-11 | 1984-11-10 | 1985-05-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-05-11 | 1988-11-10 | 1989-05-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-05-11 | 1992-11-10 | 1993-05-12 | $7700.00 | Window Closed / Lapsed |