Patent ID: 8975332
Filing Date: 2015-03-10
Classification: C08F,C09D

Abstract:
1. A process for the preparation of an aqueous dispersion of hydroplasticisable multiphase vinyl polymer particles comprising, (1) a first polymerization step comprising (2) a second polymerization step comprising wherein carboxylic acid functional monomers in the second monomer mixture is present in an amount such that the acid value of the resulting second polymer is less than 23 mg KOH/g and wherein the amount of monomer mixture (2a1) is between 10 and 90 wt % of the total weight of monomer mixtures (1a1) plus (2a1) (2b) polymerizing second monomer mixture (2a1) to form a second stage polymer in the first particle dispersion (1B) to form a multiphase particle dispersion (2B) (3) optionally hydroplasticising the multiphase particle dispersion (2B) by addition of base, to a pH between 6.5 and 10, (4) optionally adding a separate crosslinking agent for reaction with crosslinking monomers in monomer mixtures (1a1) or (2a1) or with unsaturated groups (2a2).