Claims
- 1. 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.
- 2. The process of claim 1 wherein the polymer is poly(methylmethacrylate).
- 3. The process of claim 1 wherein the solvent is a halogenated aliphatic.
- 4. The process of claim 1 wherein the nonsolvent is an alkane of five to eight carbon atoms.
- 5. The process of claim 1 wherein the polymer is poly(methylmethacrylate), the solvent is methylene chloride, and the non-solvent is hexane.
- 6. The process of claim 1 where the polymer is poly(methylmethacrylate), the solvent is acetone and the non-solvent is water.
- 7. The process of claim 1 wherein the particles are washed with non-solvent and water prior to recovery.
RELATED APPLICATIONS
This application is a continuation-in-part of my copending application U.S. Ser. No. 892,396, filed Mar. 31, 1978, now abandoned.
US Referenced Citations (5)
Foreign Referenced Citations (2)
Number |
Date |
Country |
786777 |
Jun 1968 |
CAX |
846785 |
Jul 1970 |
CAX |
Non-Patent Literature Citations (2)
Entry |
Coppedge et al.; J. Econ. Ent., vol. 68 (4), (1975), pp. 508-510. |
Blank; C. A., vol. 79, (1973) 14455v. |
Continuation in Parts (1)
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Number |
Date |
Country |
Parent |
892396 |
Mar 1978 |
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