Herbicidal latex dispersion for controlled delivery and release of herbicides and their preparation
AssigneeDowElanco
InventorsLinneaus C. Dorman, Paul A. Meyers
Life of this patent
Estimating the term…
Abstract
A controlled release and delivery system for a hydrophobic, water sensitive herbicide is produced by: (a) dissolving the herbicide in a volatile water-immiscible solvent; (b) introducing the solvent containing the herbicide dissolved therein to a latex dispersion comprising an aqueous continuous phase and polymeric discrete phase; (c) agitating the resultant mixture until the polymeric particles of the discrete phase absorb the herbicide; and (d) removing the solvent from the resultant mixture at reduced pressure.
Claims20
A method for preparing a herbicidal latex dispersion comprising an aqueous continuous phase and a polymeric discrete phase wherein the polymeric particles of the discrete phase contain a hydrophobic herbicide susceptible to hydrolysis selected from the group consisting of
- tridiphane (1,1,1-trichloro-3,4-epoxy-3-(3,5-dichlorophenyl)butane;
- 1,1,1-trichloro-3,4-epoxy-3-(3,5-dibromophenyl)butane;
- 1,1,1-trichloro-3,4-epoxy-3-(3,5-dimethylphenyl)butane;
- 1,1,1-trichloro-3,4-epoxy-3-(3,5-chlorophenyl)butane;
- 1,1,1-trichloro-3,4-epoxy-3-(3,5-dichlorophenyl)pentane;
- .alpha.-(2,2,2-trichloroethyl)-3,5-dichlorostyrene;
- .alpha.-(2,2,2-dichloropropyl)-3,5-dichlorostyrene;
- and
- .alpha.-(2,2,2-trichloroethyl)-3,5-dibromostyrene;
- which comprises:
- (a) dissolving the herbicide in a volatile water-immiscible solvent;
- (b) introducing the solvent containing the herbicide dissolved therein to a latex dispersion comprising an aqueous continuous phase and polymeric discrete phase having herbicidal absorption capacity;
- (c) agitating the resultant mixture for a time sufficient for the polymeric particles of the discrete phase to absorb the herbicide;
- and
- (d) removing the solvent from the resultant mixture at reduced pressure.
Dependencies are inferred from the claim text.