| abstract |
PURPOSE: A thermoplastic resin containing a combination of titanium oxide and a phenolic antioxidant is mixed with a specific phosphorus antioxidant to prevent the yellowing caused by the above combination for a long period of time under high-temperature conditions. n CONSTITUTION: A phosphorus antioxidant having nonaromatic hydrocarbon residues such as aliphatic phosphorous ester is added to a composition that is composed of 100pts.wt. of a thermoplastic resin such as polyolefin, especially polypropylene, 0.1W250pts. of titanium oxide and 0.01W2.0pts. of a phenolic antioxidant such as 2,6-butyl-4-methylphenyl by 10W500wt% based on the phenolic antioxidant. As the above phosphorous ester, is referred a compound of the formula (n≥1; n'≤50; m≥1; m'≤20), preferably a compound of n≥10, n'≤25, m≥1 and m'≤3. n COPYRIGHT: (C)1982,JPO&Japio |