Patent ID: 9399696
Filing Date: 2016-07-26
CPC Classification: C08G

Claim Text:
1. A method of producing a polymer polyol dispersion, the method comprising: 1) in a first step, a) combining at least one of a tin-free catalyst, at least one of a polyol, and at least one of a co-reactant, wherein the co-reactant has an equivalent weight of up to 400 and at least one active hydrogen attached to a nitrogen or oxygen atom, and b) introducing at least one polyisocyanate to create a polymer polyol having a first solid content; 2) in a second step, a) introducing at least one of a co-reactant to the polymer polyol, wherein the co-reactant has an equivalent weight of up to 400 and at least one active hydrogen attached to a nitrogen or oxygen atom, b) introducing at least one polyisocyanate to create a polymer polyol having a second solid content; and repeating the second step at least 1 time until a final polymer polyol having a final solid content is obtained.