Polyurethane latexes from NCO prepolymers chain extended with po

Details Polyurethane latexes from NCO prepolymers chain extended with po Polyurethane latexes from NCO prepolymers chain extended with po

1976-12-14

1979-07-03

Tillman, Murray

Stock material or miscellaneous articles

Composite

Of polyamidoester

260 292TN, 260 294R, 260 294UA, 528 59, 528 60, 525454, 525456, C08G 1206, C08G 1834, C08G 1832, C08G 1830

Patent

active

041600657

ABSTRACT:
A latex suitable for forming improved water-resistant polyurethane products. The latex is prepared in an aqueous system by reacting an NCO-terminated, quaternized, preferably linear, polyurethane prepolymer with water and chain-extending the resulting polyurethane-urea with a difunctional or polyfunctional reagent containing groups reactive with primary amino groups, such as epoxy groups, anhydrides and aldehydes, thus increasing the molecular weight of said polyurethane-urea. The latex thus formed can be dried into highly water-resistant films, coatings, and the like.

REFERENCES:
patent: 3479310 (1969-11-01), Dieterich et al.
patent: 3756992 (1973-09-01), Dieterich et al.
patent: 3813361 (1974-05-01), Gillis et al.
patent: 3873484 (1975-03-01), Bluestein et al.
patent: 3925181 (1975-12-01), McGinniss
patent: 3931116 (1976-01-01), Bernstein et al.
patent: 3971745 (1976-07-01), Carlson et al.
patent: 4008196 (1977-02-01), Matsuda et al.
patent: 4012349 (1977-03-01), Matsuda et al.
patent: 4016120 (1977-04-01), Matsuda et al.
patent: 4016123 (1977-04-01), Matsuda et al.

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