| 摘要 |
PROBLEM TO BE SOLVED: To obtain a resin compsn. excellent in durability and resistances to heat and urinary discoloration by incorporating a polypropylene resin, a white pigment, and a hindered amine compd. having a specified mol.wt., each in a specified amt., into the same and specifiying the content of a phenolic antioxidant to a certain value or lower. SOLUTION: This compsn. contains 100 pts.wt. polypropylene resin having a melt flow rate of 0.1-100 g/10 min, 0.2-10 pts.wt. white pigment having an average particle size of 0.05-1μm, and 0.02-2 pts.wt. hindered amine compd. having a mol.wt. of 1,500 or higher and contains 0.02 pt.wt. or lower phenolic antioxidant. Pref., the compsn. further contains 0.01-1 pt.wt. hindered amine compd. having a mol.wt. of 800 or lower and 0.02-1 pt.wt. phosphorus-based antioxidant. At least one pigment selected from among titanium oxide, zinc oxide, and zinc sulfide is used as the white pigment, and in the case of titanium oxide, one surface-treated with aluminum oxide, silicon oxide, zinc oxide, etc., is pref.
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