Patent ID: 6642306
Filing Date: 2003-11-04
Classification: C08F

Abstract:
A process for preparing stable dispersions of (co)polymers in a polyol by in situ polymerization of an ethylenically unsaturated monomer or mixture of monomers in the presence of an initiator comprising an azocarboxylic acid ester of formula (II) or a mixture of azocarboxylic acid esters of formula (II) wherein R1, R2, R3 and R4, which may be identical or different, are independently selected from the group consisting oflinear or branched alkyls comprising from 1 to 9 carbon atoms optionally substituted with one or more substituents selected from hydroxyl, C1 to C6 alkoxy and halogen substituents; C3 to C12 cycloalkyls, optionally substituted with one or more substituents selected from C1 to C6 alkyl, C1 to C6 alkoxy, hydroxyl and halo groups; aralkyls optionally substituted with one or more C1 to C6 alkyl, C1 to C6 alkoxy, hydroxyl and halo groups; aryls optionally substituted with one or more substituents selected from C1 to C6 alkyl, C1 to C6 alkoxy, hydroxyl and halo groups; with at least one of the combinations R1-R2 and R3-R4 possibly forming an aliphatic ring; Râ€³ and Râ€² are identical or different and are independently selected from the group consisting of linear or branched C1 to C10 aliphatic radicals.