Stable aqueous polyurethane dispersions

Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – At least one aryl ring which is part of a fused or bridged...

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4284231, 4284251, 4284258, 524507, 524839, 524840, 525123, 525455, 525902, 525903, C08J 300, C08K 320, C08L 7500

Patent

active

060179988

ABSTRACT:
The present invention discloses a stable aqueous polyurethane dispersions comprising a reaction product of a water dispersible isocyanate-terminated polyurethane prepolymer (A), an aqueous polyurethane dispersion (B) and water, and a method wherein a water dispersible isocyanate-terminated polyurethane prepolymer (A) is dispersed in at least one aqueous polyurethane dispersion (B) and water, and reacted at about 35.degree. C. to about 95.degree. C. until substantially free of isocyanate. The inventive dispersions are useful in adhesives, coatings, binders, primers and sizers.

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"Handbook of Adhesives", Irving Sherst, 3rd Edition, Chapter 1, p. 18.

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