Polyhydroxyalkane/aromatic diamine chain extenders

Details Polyhydroxyalkane/aromatic diamine chain extenders Polyhydroxyalkane/aromatic diamine chain extenders

C - Chemistry, Metallurgy

08

G

400/102, 402/142

C08G 18/32 (2006.01) C08G 18/10 (2006.01)

Patent

CA 1334556

Blends of 90-99 mol % of a polyhydroxyalkane containing 2-6 carbons and 2-3 hydroxyl groups and 1-10 mol % of an aromatic diamine having a pKb value greater than 11.3 are useful as chain extenders for polyurethanes derived from diphenylmethanediisocyanate (MDI) prepoly- mers. Their use overcomes the sensitivity to stoichio- metry common to MDI prepolymer/polyhydroxyalkane systems and leads to the formation of cast elastomers having better green strength and a shorter demold time. The preferred blends are blends of 1,4-butanediol and di(alkylthio)toluenediamines.

574782

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