Patent · US Expired

Permanently stabilized polyurethanes

US4145512A · kind A · utility

28Cited by

3References

4Claims

0Family size

Assignee

BAYER HEALTHCARE LLC · DE

Inventors

Paul Uhrhan
Harald Oertel · Odenthal, DE
Reinhard Lantzsch · Leverkusen, DE
Ernst Roos
Dieter Arlt · Cologne, DE

Key dates

Filing date	Sep 19, 1977
Grant date	Mar 20, 1979
Priority date	—
Expiry date	Sep 19, 1997

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC08G18/3834
WIPO fieldMacromolecular chemistry, polymers
WIPO sectorChemistry

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.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.