Thermally linkable aqueous polyurethane dispersions

Details Thermally linkable aqueous polyurethane dispersions Thermally linkable aqueous polyurethane dispersions

1976-08-30

1980-01-22

Lieberman, Allan

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

528 61, C08J 310, C08L 7506

Patent

active

041849892

ABSTRACT:
An improvement in a process for the preparation of a solvent-free exclusively aqueous dispersion of a thermally linkable, storage stable, light stable polyurethane obtained by the reaction of a hydroxy group containing polyester composition and a diisocyanate in a ketonic solvent at 10.degree.-50.degree. C. employing the hydroxyl containing polyester and diisocyanate in amounts such that there are 1.5-2.0 NCO equivalents per OH group and the reaction product is thereafter reacted with a primary diamine, secondary diamine or diol in such an amount that 30-70% of the existing free NCO groups on said reaction product are reacted and the resultant reaction product is dispersed in water and said ketonic solvent is removed. The invention resides in that one uses as diisocyanate the uretdione of the 3-isocyanatomethyl-3,5,5-trimethylcyclohexyl-isocyanate.

REFERENCES:
patent: 3248370 (1966-04-01), Reischl et al
patent: 3903032 (1975-09-01), Matsuda et al.
patent: 3923743 (1975-12-01), Quiring et al.
patent: 3989662 (1976-11-01), Schmitt et al.
patent: 4012349 (1977-03-01), Matsuda et al.
patent: 4044171 (1977-08-01), Muller et al.

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