Composite articles

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C - Chemistry, Metallurgy

08

G

400/103, 403/14,

C08G 18/22 (2006.01)

Patent

CA 1310775

E 34343 Abstract Composite Articles A composite article comprising a body of semi-rigid polyurethane foam in contact with a layer or sheet of polymeric material. The foam is prepared by reacting an organic polyisocyanate with a polymeric polyol having a hydroxyl number in the range from 20 to 80 and a crosslinking agent or chain extender having a hydroxyl number of at least 250 in the presence of water and a catalytically effective amount of an alkali metal or alkaline earth metal salt of an acid of the formula: R-A-COOH (1) wherein R represents RIOCO-, R'COO- or R'O-, R' represents an optionally substituted hydrocarbon or heterocyclic radical and A represents an optionally substituted C1-C3 chain. The composite articles produced are resistant to staining of the polymeric material by the polyurethane foam catalyst.

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