Preparation of polyamines by hydrolyzing a polyisocyanate in the

Details Preparation of polyamines by hydrolyzing a polyisocyanate in the Preparation of polyamines by hydrolyzing a polyisocyanate in the

1983-11-25

1985-02-26

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...

528 51, 528 52, 528 53, 528 55, 528 57, 528 58, 528 73, 528 75, 528 76, 528 77, 528 78, 528 80, 528 81, 528 83, 528 84, 528 85, C08G 1882

Patent

active

045018731

ABSTRACT:
High molecular weight aromatic polyamines are produced by hydrolyzing a polyisocyanate having an isocyanate content of from 21 to 52.5% and an isocyanate-reactive group-containing compound having a molecular weight of from 400 to 10,000 in the presence of an excess of water. The reactants are used in quantities such that the equivalent ratio of isocyanate to isocyanate-reactive groups is from 0.1 to 5. Further, water is used in an amount such that the equivalent ratio of water to isocyanate groups is greater than 1. Low molecular weight compounds containing isocyanate-reactive groups, solvents, basic catalysts and urethanization catalysts may also be included in the mixture to be hydrolyzed. The hydrolysis is carried out at a temperature of from -20.degree. to 175.degree. C. The product amine is isolated from the reaction mixture by procedures such as phase separation, extraction and distillation. The polyamines thus-produced are particularly useful in the production of polyurethanes.

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