Patent ID: 6653362
Filing Date: 2003-11-25
Classification: C08G

Abstract:
A process for producing a flexible polyurethane foam, which comprises reacting the following polyoxyalkylene polyol (C) and the following polyisocyanate compound in the presence of a catalyst and a blowing agent to produce a flexible polyurethane foam having a resonance frequency of at most 3.7 Hz, a resonance ratio of at most 3.5 and an impact resilience of at most 70%:Polyoxyalkylene polyol (C): a polyoxyalkylene polyol which contains from 0.5 to 45 mass % of a random addition structure of ethylene oxide and an alkylene oxide having a carbon number of at least 3 in its structure and which further contains from 95 to 50 mass % of the following polyoxyalkylene polyol (A) and from 5 to 50 mass % of the following polyoxyalkylene polyol (B); Polyoxyalkylene polyol (A): a polyoxyalkylene polyol produced by ring opening polymerization of a cyclic ether by means of an alkali metal catalyst; Polyoxyalkylene polyol (B): a polyoxyalkylene polyol produced by ring opening polymerization of a cyclic ether by means of a double metal cyanide complex at least partially as a polymerization catalyst; Polyisocyanate compound: a polyisocyanate compound containing from 0 to 50 mass % in total of a diphenylmethane diisocyanate and/or a polymethylenepolyphenyl isocyanate.