Patent ID: 8288468
Filing Date: 2012-10-16
Classification: C08F,C08L,C09D,C09J

Abstract:
1. A process for the preparation of an aqueous hybrid polymer dispersion comprising a hybrid polymer of an auto-oxidatively crosslinkable polymer and an addition polymer, wherein in a first polymerization step a first hybrid polymer dispersion is formed by addition polymerization of vinyl monomers in the presence of dispersed auto-oxidatively crosslinkable polymer, wherein, in a second polymerization step secondary polymerization loci are provided in the first hybrid polymer dispersion to polymerise residual vinyl monomer of the first polymerisation step; wherein the secondary polymerisation loci are provided after at least 75% conversion of the vinyl monomers in the first polymerisation step; and wherein the dispersion comprises two different populations; a first population of particles comprises a hybrid polymer comprising an auto-oxidatively crosslinkable polymer and an addition polymer and a second population of particles comprises a second addition polymer.