Stabilizer system for non yellowing polymer composition

Details Stabilizer system for non yellowing polymer composition Stabilizer system for non yellowing polymer composition

C - Chemistry, Metallurgy

08

K

C08K 5/3475 (2006.01) C08F 12/08 (2006.01) C08K 5/315 (2006.01) C08K 5/3435 (2006.01) C08K 5/3492 (2006.01) C08K 5/357 (2006.01)

Patent

CA 2177737

A stabilizer system for styrenic polymers consisting essentially of (a) a benzotriazole; (b) an oligomeric condensate of N,N'-(2,2,6,6-tetramethylpiperidyl) hexamethylene diamine and 2,4-dichloro-6-morpholino-1,3,5-s-triazine; and (c) tris (3,5-d9-tert-butyl-4-hydroxybenzyl) isocyanurate with the proviso that the stabilizer system does not contain phosphites or phosphonites stabilizers. Further, an alternate embodiment is a stabilizer system for styrene polymers consisting essentially of (a) a benzotriazole; (b) a hindered amine light stabilizer selected from the group consisting of (i) bis(2,2,6,6-tetramethyl-4-piperidinyl) sebacate; and (ii) bis-(1,2,2,6,6-pentamethyl-4-piperdinyl) ester of (3,5-di-tert-butyl-4- hydroxybenzyl)-butyl malonate; and (c) tris (3,5-di-tert-butyl-4-hydroxybenzyl) isocyanurate with the proviso that the stabilizer system does not contain phosphites or phosphonites stabilizers.

Système de stabilisation destiné à supprimer le jaunissement des polymères au styrène comprenant un benzotriazole tel que 2-(2'-hydroxy-3',5'-di-tert-amylphényl)benzotriazole, un hydroxybenzocyanurate tel que tris-(3,5-di-tert-butyl-4-hydroxybenzyl)isocyanurate et un produit de condensation d'une N,N'-(2,2,6,6-tétraméthylpipéridyl)alkylènediamine et d'une 6-amino-2,4-dichloro-1,3,5-s-triazine tel que le produit de condensation de N,N'-(2,2,6,6-tétramétylpipéridyl)hexaméthylènediamine et de 6-morpholino-2,4-dichloro-1,3,5-s-triazine. De plus, ce système de stabilisation peut comprendre un thiodipropionate dialkyle et un dialkyldithiocarbamate de zinc.

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