UV-light stabilized polyester molding compositions

Details UV-light stabilized polyester molding compositions UV-light stabilized polyester molding compositions

1988-11-10

1991-07-16

Morgan, Kriellion

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Processes of preparing a desired or intentional composition...

524110, 524336, C08K 53492, C08K 505, C08K 506

Patent

active

050326317

ABSTRACT:
Polyester molding compositions include an effective amount of a triazine-based antioxidant and a benzophenone ultraviolet light absorber sufficient to achieve a clor difference, as calculated in CIELab units under illuminant "D-65" according to ASTM Standard D-2244, of less than about 10,0, when exposed in a Xenon arc weather-ometer operated according to SAE J1885 for 315 Kj/sq.m. The triazine-based antioxidant is of the formula: ##STR1## wherein R is a phenolic group attached to the triazine ring via a C1 to C5 alkyl or an ester substituent. Preferably, the triazine-based antioxidant is 3,5-di-tert-butyl-4-hydroxyhydrocinnamic acid triester with 1,3,5-tris-(2-hydroxyethyl)-s-triazine-2,4,6-(1H, 3H, 5H) trione. The benzophenone UV-absorber is of the general formula: ##STR2## where R' is hydrogen or an alkyl radical.

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