Aqueous polyurethane-ureas dispersions and their use for the pro

Details Aqueous polyurethane-ureas dispersions and their use for the pro Aqueous polyurethane-ureas dispersions and their use for the pro

1987-05-19

1989-05-02

Ivy, C. Warren

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

Synthetic resins

Processes of preparing a desired or intentional composition...

525418, 525454, C08L 6300, C08L 7512

Patent

active

048268941

ABSTRACT:
The present invention is directed to stable, aqueous dispersions of polyurethane-ureas which are formed by dispersing a blend of anionically modified isocyanate terminated prepolymer and epoxy resin in water and chain extending said dispersed blend with a polyamine having an average functionality of about 2.0 to 6.0 in an amount sufficient to provide a ratio of amino groups to isocyanate groups of about 0.6:1.0 to 1.0:1.0.
The present invention is also directed to the use of the aqueous polyurethane-urea dispersions for the production of coated substrates having improved humidity resistance.

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