Patent ID: 7572837

Claim:
A process of producing flexible polyurethane foams comprising reacting a polyol component and a polyisocyanate component in the presence of catalysts, wherein (1) the polyol component comprises a polyether polyol having a hydroxyl value of from 33 to 84 mg-KOH/g and containing at least 5% by weight (based on the weight of the polyether polyol in the polyol component) of oxyethylene group in the chain thereof and having all of the terminals of the polyether polyol chain capped with secondary OH groups, (2) the polyisocyanate component is a toluene diisocyanate and/or a derivative thereof, and (3) the catalyst is one or more members selected from imidazole compounds represented by the following general formula: wherein R1, R2, and R3 independently represent a hydrogen atom, an alkyl group having from 1 to 4 carbon atoms, a hydroxymethyl group, or a phenyl group; and R4 represents a hydrogen atom, an alkyl group having from 1 to 4 carbon atoms, an aminopropyl group, a dimethylaminopropyl group, a benzyl group, a vinyl group, an allyl group, a phenyl group, a cyanoethyl group, or a functional group represented by the following formula: wherein R5 represents a hydrogen atom or an alkyl group having from 1 to 4 carbon atoms; and p represents an integer of from 1 to 3, optionally in combination with tertiary amines and quaternary ammonium salts, are used as the sole catalysts, and a tin-based catalyst is not used.