Hindered amine light stabilizer hydrazides for stabilizing polyu

Details Hindered amine light stabilizer hydrazides for stabilizing polyu Hindered amine light stabilizer hydrazides for stabilizing polyu

1991-01-07

1992-07-21

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 73, 521166, C08G 1832

Patent

active

051323877

ABSTRACT:
Stabilized polyurethanes, polyureas and polyurethane-polyurea polymers having hindered amine light stabilizers (HALS) bonded thereto by means of a hydrazide functionality attached to the HALS are provided. The synergistic effect of a second amide functional group in the HALS-hydrazide provides improved photostabilization efficiency as compared to HALS-hydrazides of the prior art.

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