Patent ID: 7521506
Filing Date: 2009-04-21
Classification: C08F,C08G,C09D

Abstract:
1. A microgel dispersion obtained by intermolecular or intramolecular crosslinking in an aqueous medium of a pre-polymer, wherein the pre-polymer has at least two capped NCO groups and at least three groups having at least one active hydrogen atom bonded to a nitrogen atom; or at least three capped NCO groups and at least two groups having at least one active hydrogen atom bonded to a nitrogen atom; at least one segment in the backbone of the polyester originating from a triol, polyol, linear, or branched polyester polyol; and at least one group capable of forming anions, wherein in the intermolecular or intramolecular crosslinking the nitrogen atoms carrying at least one active hydrogen atom react with the blocked NCO groups while forming urea compounds and releasing the blocking agent; and the microgel dispersion is emulgator-free.