Polyurethane curing agent dispersion

Details Polyurethane curing agent dispersion Polyurethane curing agent dispersion

C - Chemistry, Metallurgy

08

K

400/110, 400/740

C08K 5/18 (2006.01) C08G 18/10 (2006.01) C08K 3/16 (2006.01) C08K 5/52 (2006.01) C08L 75/04 (2006.01)

Patent

CA 1136325

ABSTRACT To a dispersion of a complex of 3 moles of 4,4'-methylenedianiline with 1 mole of a specified inorganic salt in an inert liquid, which still contains some free methylenedianiline, there is added, with agitation, at least 0.5 equivalent of an organic iso- cyanate per equivalent of free methylenedianiline. Then, there is added, while continuing agitation, at least 0.5 weight % of lecithin. The resulting disper- sion is a good curing agent for isocyanato-terminated polyurethane prepolymers. Compositions containing both the prepolymer and the curing agent of this invention have good shelf stability at room temperature and cure to polyurethane products having good physical proper- ties and hydrolytic stability.

338842

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