Cross-linked aqueous polyurethane dispersions containing dimer/t

Details Cross-linked aqueous polyurethane dispersions containing dimer/t Cross-linked aqueous polyurethane dispersions containing dimer/t

1995-01-23

2000-12-12

Gorr, Rachel

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...

528 61, 528 67, 528 71, 524839, 524840, 524872, 4273855, C08G 1870

Patent

active

061600768

ABSTRACT:
The present invention relates to a composition being an aqueous dispersion of a polyurethane in water, said composition comprising water and the reaction product of (a) a water-dispersible isocyanate-terminated polyurethane prepolymer having an NCO content of between 2.1 and 10% by weight, (b) an organic polyisocyanate adduct mixture comprising a polyisocyanate dimer and a polyisocyanate trimer and having an average isocyanate functionality of between 2.1 and 4.0, and (c) an amine chain extender having a specified ratio of NH2 relative to the NCO index of the polyisocyanate adduct mixture. Also disclosed is a process for preparing this composition, and a method for coating a substrate with the composition.

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patent: 4554308 (1985-11-01), Russiello
patent: 5098983 (1992-03-01), Mosbach et al.
patent: 5169895 (1992-12-01), Coogan et al.

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