US4282209A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for preparing insecticidal compositions
Assignee: EIDP Inc
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Filing: 1979-11-08
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Granted: 1981-08-04
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Expires: 1999-11-08
Abstract
Abstract The instant invention relates to a process for preparing novel insecticide-polymer particles. The process consists essentially of dissolving the insecticide, methomyl, and a polymer in a solvent in which both are soluble. The solution is then comingled with a non-solvent for both the polymer and the methomyl under high shear conditions. A particulate product is formed consisting of irregularly shaped particles having methomyl embedded in a polymer matrix. The irregularly shaped particles may be dispersed, e.g. in water, and sprayed readily into an area of insect infestation.
Inventors
- 👤 Stanley Tocker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 03:34
CPC Classifications
A; A01; A01N; A01N25/00; A01N25/08; A01N25/10; A01N47/00; A01N47/08; A01N47/10; A01N47/24
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
121 words
A process for preparing controlled release particles of methomyl which comprises: (a) dissolving a water-insoluble polymer and methomyl in an organic solvent, the concentration of methomyl in the resulting solution being about 1-50% by weight and the concentration of said polymer in the resulting solution being about 1-60% by weight; (b) comingling, with high shear agitation, said methomylpolymer solution with a nonsolvent for both methomyl and said polymer, to produce particles of polymer embedded with methomyl; (c) and recovering said particles; wherein (i) said organic sovlent is miscible with said nonsolvent, and (ii) said polymer is poly(methylmethacrylate), poly(ethylmethacrylate), methylmethacrylate or ethylmethacrylate or styrene copolymers with polar monomers, ethyl cellulose, cellulose acetate, cellulose acetatebutyrate, polystyrene, polyvinyl chloride or vinyl chloride-vinyl acetate copolymers.
Claim 2
Dependent Claim
121 words
A process for preparing controlled release particles of methomyl which comprises: (a) dissolving a water-insoluble polymer and methomyl in an organic solvent, the concentration of methomyl in the resulting solution being about 1-50% by weight and the concentration of said polymer in the resulting solution being about 1-60% by weight; (b) comingling, with high shear agitation, said methomylpolymer solution with a nonsolvent for both methomyl and said polymer, to produce particles of polymer embedded with methomyl; (c) and recovering said particles; wherein (i) said organic sovlent is miscible with said nonsolvent, and (ii) said polymer is poly(methylmethacrylate), poly(ethylmethacrylate), methylmethacrylate or ethylmethacrylate or styrene copolymers with polar monomers, ethyl cellulose, cellulose acetate, cellulose acetatebutyrate, polystyrene, polyvinyl chloride or vinyl chloride-vinyl acetate copolymers.
Claim 3
Dependent Claim
10 words
The process of claim 1 wherein the polymer is poly(methylmethacrylate).
Claim 4
Dependent Claim
12 words
The process of claim 1 wherein the solvent is a halogenated aliphatic.
Claim 5
Dependent Claim
17 words
The process of claim 1 wherein the nonsolvent is an alkane of five to eight carbon atoms.
Claim 6
Dependent Claim
20 words
The process of claim 1 wherein the polymer is poly(methylmethacrylate), the solvent is methylene chloride, and the non-solvent is hexane.
Claim 7
Dependent Claim
19 words
The process of claim 1 where the polymer is poly(methylmethacrylate), the solvent is acetone and the non-solvent is water.
Claim 8
Dependent Claim
17 words
The process of claim 1 wherein the particles are washed with non-solvent and water prior to recovery.
References Cited (Backward Citations)
CA786777A
Cited
CA846785A
Cited
US3400093A
Cited
US3576834A
Cited
US3769417A
Cited
US3966902A
Cited
US4007258A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-08-03 | 1985-02-02 | 1985-08-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-08-03 | 1989-02-02 | 1989-08-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-08-03 | 1993-02-02 | 1993-08-04 | $7700.00 | Window Closed / Lapsed |