Stabilizer system for non yellowing polymer composition

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

1995-10-30

1997-04-29

Morgan, Kriellion S.

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

Synthetic resins

Processes of preparing a desired or intentional composition...

524 99, 524100, 524101, 524301, 524303, 25240052, 252403, 252406, C08K 534

Patent

active

056249829

ABSTRACT:
A stabilizer system for the suppression of yellowing in styrenic polymers, consisting essentially of a benzotriazole such as 2-(2'-hydroxy-3',5'-di-tert-amylphenyl)benzotriazole, a hydroxybenzocyanurate such as tris-(3,5-di-tert-butyl-4-hydroxybenzyl)isocyanurate and 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. Additionally a dialkyl thiodipropionate and a zinc dialkyldithiocarbamate may be included in the stabilizer system.

REFERENCES:
patent: 3531483 (1970-09-01), Gilles
patent: 4331586 (1982-05-01), Hardy
patent: 4464496 (1984-08-01), Nemzek et al.
patent: 5004770 (1991-04-01), Cortolano et al.
patent: 5492948 (1996-02-01), Chang et al.

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