Uv-light stabilized polyoxymethylene molding compositions

C - Chemistry – Metallurgy – 09 – K

Patent

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C09K 15/20 (2006.01) C08K 5/3435 (2006.01) C08K 5/3475 (2006.01) C08K 5/3477 (2006.01) C08K 5/3492 (2006.01) C09K 15/30 (2006.01)

Patent

CA 2001961

ABSTRACT A polyoxymethylene composition which exhibits improved stability against the degradative effects of ultraviolet light includes a triazine-based antioxidant and UV stabilizers. One preferred composition of the invention includes, based upon the total weight of the composition, an oxymethylene copolymer, between 0.015 to about 0.4 weight percent of 2,4,6-triamino-sym-triazine (as a formaldehyde scavenger), between about 0.25 to about 1.0 weight percent of each of 2-2(hydroxy-5-t-octylphenyl) benzotriazole, and bis(2,2,6,6-tetramethyl-4- piperidinyl)sebacate as UV light stabilizers, and between about 0.25 to about 1.0 weight percent of 3,5-di-tert-butyl-4-hydroxyhydrocinnamic acid triester with 1,3,5-tris(2-hydroxy-ethyl)-s- triazine-2,4,6(1H, 3H, 5H)-trione as an antioxidant. Due to their enhanced UV-light stability property, the compositions of the invention find particular utility as molded automobile components.

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