Modified polyisocyanates containing sulfonic acid ester groups

Details Modified polyisocyanates containing sulfonic acid ester groups Modified polyisocyanates containing sulfonic acid ester groups

1979-01-08

1980-03-18

Cockeram, H. S.

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...

252182, 260453AR, 260456P, 521160, 521162, 521179, 528 71, 528 73, C08G 1877, C08G 1814, C07C14368

Patent

active

041940350

ABSTRACT:
The instant invention is directed to a process for the preparation of modified polyisocyanates which contain sulfonic acid alkyl ester groups and in which the isocyanate groups may be at least partly in the dimerized form, comprising: reacting isocyanatoaryl sulfonic acids having at least two isocyanate groups and wherein the isocyanate groups may be at least partly in the dimerized form, optionally as mixtures with mono and/or polyisocyanates which are free from sulfonic acid groups, with di- and/or tetrahydrofurans at 0.degree. to 190.degree. C., wherein the equivalent ratio of isocyanate groups, including any isocyanate groups present in the dimerized form, to sulfonic acid groups is greater than 1 and the equivalent ratio of di- and tetrahydrofuran groups to sulfonic acid groups is from 0.1:1 to 10:1.

REFERENCES:
patent: 2901497 (1959-08-01), Delfs et al.
patent: 3535274 (1970-10-01), Dieterich et al.
patent: 3826769 (1974-07-01), Carlson
patent: 3988268 (1976-10-01), Dietrich et al.
patent: 3993614 (1976-11-01), Carlson
patent: 4119658 (1978-10-01), Dieterich

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