Claims
- 1. An aqueous suspension concentrate containing between about 20 and about 90 wt. % active hydrophobic material; between about 0.1 and about 15 wt. % of a copolymeric, anionic dispersing agent and between about 0.1 and about 10 wt. % of a homopolymer and/or a copolymer of a heterocyclic vinyl lactam containing 4 to 6 ring carbon atoms; which heterocyclic polymer is optionally substituted on the ring or in the vinyl moiety with lower alkyl.
- 2. The aqueous suspension of claim 1 wherein said vinyl lactam polymer has a weight average molecular weight of from about 5,000 to about 100,000.
- 3. The aqueous suspension of claim 2 wherein said vinyl lactam polymer is selected from the group consisting of homo- and co- polymers of N-vinyl pyrrolidone, N-vinyl caprolactam and mixtures thereof.
- 4. The aqueous suspension of claim 2 wherein said vinyl lactam polymer is K-30 poly(N-vinyl pyrrolidone).
- 5. The aqueous suspension of claim 2 wherein said vinyl lactam polymer is a copolymer of N-vinyl pyrrolidone and butene.
- 6. The aqueous suspension of claim 2 wherein said vinyl lactam polymer is a copolymer of N-vinyl pyrrolidone and a C14 to C24 alpha olefin.
- 7. The aqueous suspension of claim 2 wherein said vinyl lactam polymer is a copolymer of N-vinyl pyrrolidone and vinyl acetate.
- 8. The aqueous suspension of claim 2 wherein said vinyl lactam polymer is a copolymer of N-vinyl pyrrolidone, dimethylaminoethylmethacrylate and N-vinyl caprolactam.
- 9. The aqueous suspension of claim 1 wherein said anionic dispersing agent is a partially neutralized lower alkyl vinyl ether/maleic acid half ester copolymer.
- 10. The aqueous suspension of claim 1 wherein said anionic dispersing agent is a sulfonated naphthalene formaldehyde condensate.
- 11. The aqueous suspension of claim 1 wherein said anionic dispersing agent is selected from the group consisting of a lignosulfonate and a metal salt thereof.
- 12. The aqueous suspension of claim 1 wherein said anionic dispersing agent is the sodium salt of alkyl vinyl ether/maleic acid half ester copolymer.
- 13. The aqueous suspension of claim 1 wherein said anionic dispersing agent is a polyacrylate copolymer.
- 14. The aqueous suspension of claim 1 containing between about 0.5 and about 10 wt. % anionic dispersing agent and between about 0.3 and about 5 wt. % lactam polymer.
- 15. The aqueous suspension of claim 1 wherein the mole ratio of anionic dispersant to lactam polymer is between about 0.1:1 and about 3:1.
- 16. The aqueous suspension of claim 1 optionally contains up to 10 wt. % of a excipient selected from the group of an anti-freezing agent, a defoaming agent, a thickening agent and mixtures thereof.
- 17. The aqueous suspension of claim 1 wherein said active component is a hydrophobic agricultural chemical or a mixture of said chemicals.
- 18. The aqueous suspension of one of claims 1 or 17 is diluted with water to a concentrate concentration of between about 0.1 and about 5 wt. %.
CROSS-REFERENCE TO RELATED PATENT
[0001] This application is related to U.S. Pat. No. 6,156,803 which discloses a partially neutralized alkyl vinyl ether-maleic acid half ester copolymer as a dispersing agent for insoluble agriculturally active chemicals.