Permanently stabilized polyurethanes

Details Permanently stabilized polyurethanes Permanently stabilized polyurethanes

1977-09-19

1979-03-20

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...

260 458N, 521164, 546244, 546 16, 546242, 546221, 546223, C08G 1865, C08G 1832, C07D21106

Patent

active

041455126

ABSTRACT:
According to the invention there are obtained modified polyurethanes which have a durable, wash-fast, acid-resistant, cleaning-resistant and solvent-resistant stabilization on the basis of 2,2,6,6-tetraalkyl-piperidine light protective agents. The stabilizers are integral constituents of the polyurethanes, that is to say they are built into the polyurethane chain by a chain lengthening reaction in which two H-active reactive groups (preferably from the series of primary or secondary amino groups, carboxylic acid hydrazide, carbazic ester or semicarbazide groups) of a 2,2,6,6-tetraalkyl piperidine derivative react with isocyanate groups of polyisocyanates or isocyanate prepolymers, optionally in the presence of the usual chain lengthening agents.

REFERENCES:
patent: 2702797 (1955-02-01), Rugg
patent: 2871227 (1959-01-01), Walter
patent: 3829404 (1974-08-01), Murayama et al.

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