Patent ID: 7268170

Claim:
A process for the preparation of a flexible polyurethane foam having a density of less than 8 pcf, comprising: (I) reacting (1) an aromatic polyisocyanate component having a functionality of at least about 2.0; (2) from about 90 to about 99.8 parts, based on 100 parts by weight of (2) and (3), of an isocyanate-reactive component comprising one or more polyoxyalkylene polyether polyols having from 2 to 8 hydroxyl groups, an OH number of about 11 to about 280 and containing less than or equal to 25% by weight of copolymerized oxyethylene, based on 100% by weight oxyalkylene; (3) from about 0.2 to about 10 parts, based on 100 parts by weight of (2) and (3), of a foam modifier comprising (a) from about 35 to about 80% by weight, based on the total weight of component (3), of at least one low molecular weight compound selected from the group consisting of 1,3-propanediol, 1,3-butanediol and 1,4-butanediol, and (b) from about 20 to about 65% by weight, based on the total weight of component (3), of one or more polyether polyols having from 2 to 8 hydroxyl groups, an OH number of from about 11 to about 280 and having greater than 50% by weight, based on 100% by weight of oxyalkylene, of copolymerized oxyethylene; in the presence of: (4) one or more blowing agents; (5) one or more catalysts; and (6) one or more surfactants; wherein the Isocyanate index is at least about 98.