Aqueous polyurethane dispersions containing dimer/trimer

Details Aqueous polyurethane dispersions containing dimer/trimer Aqueous polyurethane dispersions containing dimer/trimer

1994-06-24

2000-10-17

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, C08G 1870

Patent

active

061333999

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 active hydrogen-containing chain extender. Also disclosed is a process for preparing this composition, and a method for coating a substrate with the composition.

REFERENCES:
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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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