Polyurethane curing agent dispersion, process and product

Details Polyurethane curing agent dispersion, process and product Polyurethane curing agent dispersion, process and product

1979-11-21

1981-08-04

Cockeram, H. S.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

From reactant having at least one -n=c=x group as well as...

260 318R, 252182, 528 64, C08G 1832, C08G 1865

Patent

active

042823447

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 isocyanate per equivalent of free methylenedianiline. Then, there is added, while continuing agitation, at least 0.5 weight % of lecithin. The resulting dispersion 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 properties and hydrolytic stability.

REFERENCES:
patent: 3876604 (1975-04-01), Caruso et al.
patent: 3891606 (1975-06-01), Kogon
patent: 3899438 (1975-08-01), Kalil
patent: 4075150 (1978-02-01), Hoeschele
Saunders et al., Polyurethanes, Part I, Interscience, New York (1962), pp. 116-118.

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