Compositions containing hydrophobic addenda uniformly loaded in latex polymer particles

Claim 1

A composition containing a continuous aqueous phase and loaded polymer particles having an average diameter of from 0.02 to 0.2 micron and consisting essentially of (1) a loadable polymer consisting essentially of (a) repeating units forming from 60 to 95 percent by weight of the polyumer derived from at least one of (i) acrylate esters having the formula ##STR11## where R 8 is hydrogen or methyl and R 9 is lower alkyl having from 1 to 5 carbon atoms; (ii) styrene-type monomers of the formula ##STR12## where R 2 is hydrogen or methyl, R 3 , R 4 and R 6 are hydrogen or lower alkyl of from 1 to 5 carbon atoms, R 5 is hydrogen or with R 4 constitutes the atoms necessary to complete a fused benzene ring or one of R 5 and R 6 is halomethyl and (iii) vinyl acetate; (b) repeating units forming from 5 to 15 percent by weight of the polymer derived from a hydrophilic ethenic monomer having a molecular weight of at most about 300 of the formula ##STR13## where R 8 is as defined above, Q 1 is --OM or a divalent organic radical which together with the carbonyl group of the formula forms an ester or amido linking group terminating in an ammonium or --SO 3 M solubilizing group and M is hydrogen, ammonium or alkali metal; (c) repeating uinits forming from 0 to 30 percent by weight of the polymer derived from an acrylamide of the formula ##STR14## R 10 and R 11 are hydrogen or an alkyl or haloalkyl subtituent having from 1 to 5 carbon atoms; (d) repeating units forming from 0 to 10 percent by weight of the polymer derived from active methylene containing ethenic monomer exhibiting the formula ##STR15## R 12 is hydrogen, alkyl having from 1 to 12 carbon atoms or ##STR16## R 13 is alkyl having from 1 to 10 carbon atoms, cycloalkyl having from 3 to 10 carbon atoms, phenyl or ##STR17## R 14 is alkylene having from 1 to 10 carbon atoms and X 1 is cyano or alkylcarbonyl having from 1 to 8 carbon atoms, provided that one and only one of R 12 and R 13 is always ##STR18## (e) repeating units forming from 0 to 3 percent by weight of the polymer derived from a crosslinking monomer having a olecular weight of at most about 300 and having at least two independently polymerizable vinyl groups; and (2) loaded into and distributed through said particles, a hydrophobic pesticide having a solubility in distilled water at 25° C. of less than 0.5 percent and capable of being dissolved in a water-miscible organic solvent, the weight ratio of the hydrophobic pesticide to said loadable polymer being from 1:3 to 1:1.