Patent ID: 6538059
Filing Date: 2003-03-25
Classification: C08F,C08G,C09D

Abstract:
Polymer microparticles dispersed in an aqueous phase and with a fully crosslinked exterior, obtained by aqueous phase polymerization of a monomer mixture comprisingi) from 50 to 98% by weight of at least one ethylenically monofunctional compound; ii) from 2 to 50% by weight of at least one ethylenically difunctional or polyfunctional compound; in the presence of a polymer selected from a polyesterpolyol having a number-average molecular weight of from 500 to 10000, an acid number of between 22 and 224, and an OH number of between 60 to 400; polyurethane having a number-average molecular weight of from 500 to 20000, an acid number of between 25 and 150, and an OH number of between 50 to 350, the polyurethane containing on average per molecule at least one free carboxyl group originating from a polyesterpolyol; and/or polyacrylate having a number-average molecular weight of from 2000 to 100000, an acid number of between 25 and 300, and an OH number of between 50 to 250; followed by a reaction of the polymerization product with a crosslinker.