Process for the production of polyamide-polyureas and dispersion

Details Process for the production of polyamide-polyureas and dispersion Process for the production of polyamide-polyureas and dispersion

1977-11-07

1979-07-10

Cockeram, H. S.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

260 292N, 528 73, C08G 1832, C08G 1830, C08J 302

Patent

active

041607538

ABSTRACT:
The instant invention relates to a process for the production of polyureas wherein solutions of organic polyisocyanates are reacted with primary and/or secondary organic polyamines in the presence of tetracarboxylic acid dianhydrides. The polyisocyanates used are preferably difunctional linear prepolymers containing terminal isocyanate groups, while the amines used are preferably diamines. The resultant product, which contains carboxyl groups, may then be neutralized and dispersed in water.

REFERENCES:
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patent: 3518230 (1970-06-01), Sheffer et al.
patent: 3578639 (1971-05-01), Sheffer
patent: 3658773 (1972-04-01), Zecher et al.
patent: 3669937 (1972-06-01), Zecher et al.
patent: 3699075 (1972-10-01), Lubowitz
patent: 3708458 (1973-01-01), Alberino et al.
patent: 3716519 (1973-02-01), Yoda et al.
patent: 3817926 (1974-06-01), Pauze et al.
patent: 3853813 (1974-12-01), Edelman et al.
Saunders et al., Polyurethanes, Part I, Interscience, N.Y. (1962), pp. 273-275.

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