| 摘要 |
PROBLEM TO BE SOLVED: To achieve an excellent processing stability by mixing a synthetic resin with a benzimidazole derivative represented by a specified formula, a phenolic antioxidant and a sulfur antioxidant in a specified ratio. SOLUTION: 100 pts.wt. synthetic resin (e.g. ABS resin) is blended with 0.01-10 pts.wt. benzimidazole derivative represented by formula I or benzimidazole-5,6- dicarboxamide derivative represented by formula II (wherein R<1> to R<3> are each an 8-22C alkyl or a 14-18C alkylaryl). The obtained blend is mixed with 0.001-5 pts.wt. phenolic antioxidant (e.g. tetrakis[methylene-3-(3',5'-di-t-butyl-4'- hydroxyphenyl)propionate]methane), 0.001-5 pts.wt. sulfur antioxidant (e.g. pentaerythritol-tetrakis(β-laurylthiopropionate) and optionally additives such as a stabilizer, an ultraviolet absorber and a plasticizer) to obtain a synthetic resin composition excellent in processability and processing stability.
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