Cold-crosslinking polyurethane dispersions, manufacture and use

Details Cold-crosslinking polyurethane dispersions, manufacture and use Cold-crosslinking polyurethane dispersions, manufacture and use

1985-06-05

1986-07-01

Welsh, Maurice J.

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...

4273855, 528 61, C08G 1832

Patent

active

045981213

ABSTRACT:
A method for preparing an aqueous polyurethane dispersion, comprising (a) preparing a prepolymer with free NCO groups by reacting an aliphatic or cycloaliphatic polyisocyanate with a polyol, and an anionic compound; (b) dispersing said prepolymer in water; (c) reacting said water-dispersed prepolymer with a diamino hydrazide of the formula: ##STR1## wherein R is an alkylene group of 2 to 15 carbon atoms or a cycloalkylene or arylene group of 6 to 15 carbon atoms as a chain lengthening agent; (d) reacting the prepolymer of step (c) in said dispersion with formaldehyde to effect crosslinking.

REFERENCES:
patent: 4305858 (1981-12-01), Reischl
patent: 4324716 (1982-04-01), Reischl et al.

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