Patent ID: 9644097
Date: 2017-05-09
CPC Classifications: C08F,C08G,C08L

Claim:
1. A process for making a polymer polyol, comprising 1) producing a copolymerization product by a) first polymerizing one or more low molecular weight unsaturated monomers in a nitroxide-mediated or reversible addition-fragmentation chemical transfer (RAFT) polymerization to form a living polymeric macroinitiator having a molecular weight of at least 18,000 and up to 400,000 and then b) copolymerizing the living polymeric macroinitiator formed in step a) with an unsaturated polyether which has a molecular weight from 2000 to 20,000 and from 0.2 to 1 polymerizable unsaturated groups per molecule, or a mixture of the unsaturated polyether and one or more additional low molecular weight monomers and then 2) forming a dispersion of solid polymer particles in the presence of a continuous liquid polyol phase and the copolymerization product produced in step 1).