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US 4,785,076 AGranted
Polyphenylene ether resin blends having improved ultraviolet light stability
AssigneeGeneral Electric Company
InventorPeter H. Shu
Life of this patent
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Abstract
The ultraviolet light radiation stability as manifested, for instance, by the resistance to yellowing is improved for polyphenylene ether resins and blends by including a combination of a benzotriazole-based screening-type UV stabilizer and a hindered dipiperidinyl antioxidant-type UV stabilizer. The combination of the two stabilizers exhibits syneristic behavior in the compositions, conferring better resistance to yellowing than can be predicted and expected from the observed effects of each stabilizer alone. Flame retardant embodiments are illustrated.
Claims33
A thermoplastic composition, comprising
- (a) a polyphenylene ether resin;
- and
- (b) an ultraviolet light resistance enhancing amount of a stabilizer which consists of a combination of
- (i) a compound having the formula:
- ##STR9## in which R.sup.1 and R.sup.2 are independently divalent radicals derived from C.sub.2 to C.sub.20 alkanes or alkenes, straight lined or branched, and
- (ii) a compound having the formula ##STR10## in which R.sub.a, R.sub.b, R.sub.c and R.sub.d each independently represents alkyl having from 1 to 6 carbon atoms;
- R.sup.3 represents hydrogen, --OH or alkyl having from 1 to 12 carbon atoms;
- R.sup.4 represents a hydroxybenzyl group of the formula ##STR11## in which R.sup.6 and R.sup.7 each independently represents a branched alkyl group having from 1 to 9 carbon atoms, and R.sup.5 represents an alkyl group having from 1 to 20 carbon atoms.
5 more elements
Dependencies are inferred from the claim text.