C - Chemistry – Metallurgy – 08 – G
Patent
C - Chemistry, Metallurgy
08
G
403/40
C08G 18/42 (2006.01) C08G 18/14 (1980.01)
Patent
CA 1165500
A Process for the Preparation of Flexible Polyurethane Foams With Improved Resistance to Hydrolysis and Good Die CuttabilitY Abstract of the Invention The invention concerns a process for the prepara- tion of flexible polyurethane foams by reacting organic polyisocyanates, liquid polyester polyols having hydroxyl numbers of 40 to 80 and molecular weights of 1500 to 5000, which are produced by the polycondensation of organic dicarboxylic acids with either polyol mixture A, based on the overall polyol weight consisting of: 5 to 50 percent by weight of 1,4-butanediol, 20 to 60 percent by weight of 1,5-pentanediol, 8 to 35 percent by weight of 1,6-hexanediol, 2 to 15 percent by weight of at least one triol, and 0 to 65 percent by weight of diethylene glycol, or polyol mixture B, based on the overall polyol weight consisting of: 10 to 50 percent by weight of 1,4-butanediol, 15 to 45 percent by weight of 1,6-hexanediol, 2 to 15 percent by weight of at least one triol, in the presence of catalysts and blowing agents as well as optionally chain extenders, auxiliaries and additives.
393751
Grabhoefer Herbert
Weyland Peter
Basf Aktiengesellschaft
Robic Robic & Associes/associates
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