Monsanto Company

Bayer Antwerpen S.a./n.v.

Moh C Chang

Allen R Padwa

Chuan-Ju Chen

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.

Stabilizer system for non yellowing polymer composition

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 condensation product of a N,N'-(2,2,6,6-tetramethylpiperidyl)-alkylenediamine and a 6-amino-2,4-dichloro-1,3,5-s-triazine such as the condensation product of N,N'-(2,2,6,6-tetramethylpiperidyl)hexamethylenediamine and 6-morpholino-2,4-dichloro-1,3,5-s-triazine. Additionally a dialkyl thiodipropionate and a zinc dialkyldithiocarbamate may be included in the stabilizer system.

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Feeding Hills, MA, United States of America

Moh C Chang