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US 12,742,027 B2Granted
Method for preparing polymer polyol
AssigneeKorea Kumho Petrochemical Co., Ltd.
InventorsGi Jung Kim, Seulgi Kim, Jinwoo Park
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Abstract
Disclosed is a method for preparing polymer polyol comprising the steps of: (a) polymerizing polyol and aromatic vinyl monomer in the presence of an organic diluting agent; (b) additionally inputting and polymerizing polyol, aromatic vinyl monomer and unsaturated nitrile monomer in the product of step (a); and (c) removing the organic diluting agent from the product of step (b), wherein the organic diluting agent is compatible with the polymer of the aromatic vinyl monomer.
Claims12
A method of preparing a polymer polyol, comprising:
- (a) polymerizing an aromatic vinyl monomer in the presence of an organic diluent and a polyol, thereby obtaining a dissolved homopolymer seed in the form of an aromatic vinyl polymer, wherein the organic diluent is compatible with an aromatic vinyl polymer such that the homopolymer seed is dissolved;
- (b) additionally inputting the polyol, the aromatic vinyl monomer, and an unsaturated nitrile monomer to the product of (a) and performing polymerization;
- and
- (c) removing the organic diluent from the product of (b).
1 more element
Dependencies are inferred from the claim text.