Abstract: Vesiculated beads having improved scattering efficiency and resistance to shrinkage are prepared by a process which comprises:(a) forming in the presence of a polyamine, as a water-in-oil emulsion, a stable dispersion of droplets of water in a solution of a carboxylic acid functional unsaturated polyester resin having an acid value of 8 to 20, and at least one ethylenically unsaturated monomer copolymerizable with the polyester; and(b) forming in an aqueous solution, as a water-in-oil-water emulsion, a stable dispersion of the globules of the droplet-containing amine neutralized solution of the carboxylic acid functional unsaturated polyester and copolymerizable monomer; and(c) polymerizing the polyester and copolymerizable monomer by free radical addition polymerization thereby producing granules of opaque, cross-linked vesiculated beads;wherein the polyamine contains at least 3 amine groups per molecule; and wherein the amine is present at a concentration such that there are at least about 2.

Abstract: This invention relates to a latex thickener which consists essentially of the free radical addition product obtained by the emulsion polymerization of:(a) 3-15 parts styrene;(b) 15-45 parts ethyl acrylate;(c) 30-60 parts of at least one acid having the formula: ##STR1## wherein R.sub.1 and R.sub.2 can be the same or different and are hydrogen or lower alkyl of 1 to about 3 carbons; and(d) 10-25 parts of a mixture of esters; wherein the mixture of esters is the condensation reaction product of reactive amounts of (i) an ethylenically unsaturated cyclic carboxylic acid anhydride containing from 4 to about 8 carbon atoms; and (ii) an ethoxylated alcohol having the general formula: ##STR2## wherein R is from one to three aliphatic radicals of 1 to about 30 carbon atoms each and n is an integer from about 6 to 150; and (iii) a diol containing from about 2 to about 10 carbon atoms.

Abstract: Vesiculated beads having improved scattering efficiency and resistance to shrinkage are prepared by a process which comprises:(a) forming in the presence of a polyamine, as a water-in-oil emulsion, a stable dispersion of droplets of water in a solution of a carboxylic acid functional unsaturated polyester resin having an acid value of 8 to 20, and at least one ethylenically unsaturated monomer copolymerizable with the polyester; and(b) forming in an aqueous solution, as a water-in-oil-in-water emulsion, a stable dispersion of the globules of the droplet-containing amine neutralized solution of the carboxylic acid functional unsaturated polyester and copolymerizable monomer; and(c) polymerizing the polyester and copolymerizable monomer by free radical addition polymerization thereby producing granules of opaque, cross-linked vesiculated beads;wherein the polyamine contains at least 3 amine groups per molecule; and wherein the amine is present at a concentration such that there are at least about 2.