Method for preparing dispersions of crosslinked polymer particles in the presence of an unsaturated polymeric dispersion stabiliser.

摘要

Crosslinked, preferably acrylic, preferably melamine crosslinked, polymer particles formed by reactions comprising free radical addition polymerization of:(a) between about 0.5 and about 20 weight percent each of first and second monomers, each bearing functionality capable of crosslinking reaction with the other, wherein either both additionally are ethylenically unsaturated monomers or the first monomer additionally is ethylenically unsaturated and the second monomer bears multiple crosslinking functionality and no ethylenic unsaturation; and(b) between about 60 and about 99 weight percent of at least;one other monoethylenically unsaturated monomer; in the presence of (I) an organic liquid which is a solvent for the polymerizable monomers, but a non-solvent for the resultant polymer, and (II) polymeric dispersion stabilizer bearing, on the average, more than one long chain non-polar hydrocarbon molecules and at least one pendant vinyl unsaturation.