Process for the preparation of polyisocyanates addition products

Details Process for the preparation of polyisocyanates addition products Process for the preparation of polyisocyanates addition products

1978-06-16

1979-10-23

Welsh, Maurice J.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

From reactant having at least one -n=c=x group as well as...

260 292TN, 528 65, 528 71, 528 73, C08G 1834

Patent

active

041721918

ABSTRACT:
The present disclosure is concerned with a process for the preparation of carboxylate containing polyurethane and the polymers so produced. Hydroxyl bearing components are reacted with tri- or tetra-carboxylic acid monoanhydrides so as to incorporate free carboxyl groups into the component, a proportion of the carboxyl groups are neutralized to ionic salts and hydroxyl component is then reacted with polyisocyanates and simultaneously or subsequently with chain extending agents. The polymer may be obtained as a dispersion in water and the chain lengthening agent may be water, formaldehyde or water soluble amines or hydrazines.

REFERENCES:
patent: 3412055 (1968-11-01), Koral
patent: 3539483 (1970-11-01), Keberle et al.
patent: 3607800 (1971-09-01), Sekmakas
patent: 3860546 (1975-01-01), Tsou
patent: 3959348 (1976-05-01), Reiff et al.
patent: 4029617 (1977-06-01), Dhein et al.

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