Solid polymeric dispersant composition for water-insoluble actives
A solid polymeric dispersant composition for water-insoluble actives includes a primary anionic polymer dispersing agent and a co-dispersant which is a vinyl lactam, in a defined weight ratio, and wettable powders, water dispersible granules and tablets thereof, for delivery of actives to a desired site.
1 . A solid polymeric dispersant composition comprising one or more anionic polymeric dispersant agents and a co-dispersant which is 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, in a wt. ratio of 0.1:1 to 1:0.1, respectively.
2 . A solid polymeric dispersant composition according to claim 1 wherein said wt. ratio is 1:0.5 to 1:5.
3 . A solid polymeric dispersant composition according to claim 1 wherein said wt. ratio is 1:1 to 1:4.
4 . A solid polymeric dispersant composition of claim 1 wherein said vinyl lactam polymer is selected from the group consisting of homo- and co- polymers of N-vinyl pyrrolidone and N-vinyl caprolactam, and mixtures thereof.
5 . A solid polymeric dispersant composition of claim 4 wherein said vinyl lactam polymer is poly(N-vinyl pyrrolidone).
6 . A solid polymeric dispersant composition of claim 1 wherein said vinyl lactam polymer is a copolymer of N-vinyl pyrrolidone and butane, a copolymer of N-vinyl pyrrolidone and a C 14 to C 24 alpha olefin, a copolymer of N-vinyl pyrrolidone and vinyl acetate, or a copolymer of N-vinyl pyrrolidone, dimethylaminoethylmethacrylate and N-vinyl caprolactam.
7 . A solid polymeric dispersant composition of claim 1 wherein said anionic polymeric dispersing agent is a partially neutralized lower alkyl vinyl ether/maleic acid half ester copolymer.
8 . A solid polymeric dispersant composition of claim 1 wherein said anionic polymeric dispersing agent is the sodium salt of alkyl vinyl ether/maleic acid half ester copolymer.
9 . A solid polymeric dispersant composition of claim 1 wherein said anionic polymeric dispersing agent is a sulfonated naphthalene formaldehyde condensate, a lignosulfonate, or a metal salt thereof, a polyacrylate copolymer, an α-olefin maleic acid/salt copolymer, or a polystyrene maleic acid copolymer.
10 . A mixture of the solid dispersant composition of claim 1 and a substantially water-insoluble active ingredient.
11 . A mixture according to claim 10 wherein said active is an agriculturally active ingredient.
12 . A wettable powder which includes the solid dispersant composition of claim 1 , a water-insoluble active ingredient and a wetting agent, optionally with a defoamer, a thickening agent, or a filler, or mixtures thereof.
13 . A water dispersible granule comprising an agglomerated solid of composition of claim 1 , a water-insoluble active ingredient and, optionally, a defoamer, a thickening agent, a filler or binder, or mixtures thereof.
14 . A tablet comprising a compressed water dispersible granule of claim 13.