Patent ID: 9725559
Date: 2017-08-08
CPC Classifications: C08G,C08L

Claim:
1. A process for making a polyurethane foam comprising forming a foam formulation containing at least (a) one or more polyether polyol(s) having a hydroxyl equivalent weight of from 800 to 2000, wherein at least 60% by weight of the one or more polyether polyol(s) is one or more propylene oxide/ethylene oxide copolymers containing two or more hydroxyl-terminated polyether chains extending from the residue of an initiator compound, wherein the two or more hydroxyl-terminated polyether chains each contain an inner block and an outer block, each inner block having a molecular weight of from about 150 to 350 and containing from 10 to 35% by weight of oxypropylene units and from 65 to 90% by weight of oxyethylene units, and each outer block containing from 95 to 100% by weight oxypropylene units and from 0 to 5% by weight oxyethylene units, and further wherein the one or more propylene oxide/ethylene oxide copolymers have a hydroxyl equivalent weight of from 800 to 2000 and a total oxyethylene content of from 5 to 18% by weight; (b) at least one blowing agent; (c) at least one organic polyisocyanate; and (d) at least one surfactant and at least one catalyst for the reaction of an isocyanate group with a hydroxyl group, and curing the foam formulation to form a polyurethane foam.