C - Chemistry – Metallurgy – 08 – G
Patent
C - Chemistry, Metallurgy
08
G
403/31, 403/44
C08G 18/72 (2006.01) C08G 18/16 (2006.01) C08G 18/18 (2006.01) C08G 18/22 (2006.01) C08G 18/26 (2006.01)
Patent
CA 1098649
ABSTRACT OF THE DISCLOSURE An improved process for preparing polyurethane with integral skin. A composition comprising polyol, polyisocyanate and at most one part by weight of water to 100 parts by weight of polyol and catalyst, is reacted in a mould so that a poly- urethane is formed. The NCO groups of the polyisocyanate are not directly bonded to an aromatic group, and the catalyst is at least one of the following four synergistic combinations: (1) an amine containing the structure: Image in association with an alkali metal or alkaline-earth metal salt, alcoholate and/or phenolate of an acid whose dissocia- tion constant Ka ? 10-1, preferably Ka ? 10-2; (2) an organic lead compound in association with an organic initiator with one functional group of primary or secondary amine; (3) an organic lead compound in association with an amine containing the structure: Image or, (4) an organic lead compound in association with an alkali metal or alkaline-earth metal salt, alcoholate and/or phenolate of an acid whose association constant Ka ? 10-1, preferably Ka ? 10-2
273032
Du Prez Eddie
Jourquin Lucien
Na
S.a. Prb
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