COLORED RESIN COMPOSITION WITH RESISTANCE TO CHLORINE-CONTAINING WATER, PIPE FOR CITY WATER, AND IMPROVEMENT OF RESISTANCE TO CHLORINE-CONTAINING WATER OF MOLDED ARTICLE

摘要

PROBLEM TO BE SOLVED: To obtain a composition which can provide a pipe excellent in thermal oxidative deterioration resistance and resistance to a chlorine-containing water and free from bulging for a long time, with the bulge hardly growing, by using, as the constituents, a polyolefin resin, a pigment and octadecyl-3-(3,5-di-t-butyl-4- hydroxyphenyl) propionate. ;SOLUTION: This composition contains 100 pts.wt. polyolefin resin (a), 0.005-10 pts.wt. pigment (b) and 0.005-2 pts.wt. octadecyl-3-(3,5-di-t-butyl-4-hydroxyphenyl) propionate (c). As the component (a), a high-density polyethylene is usually used for a large-diameter pipe, while a linear low-density polyethylene is usually used for a small-diameter pipe. The component (b) used comprises, e.g. titanium dioxide, cobalt blue, ultramarine or a phthalocyanine blue. As to phenol-base antioxidant which has a great influence on the resistance to a chlorine-containing water, the specified component (c) is used in this composition, although a phenol-base antioxidant alone or together with a phosphorus antioxidant and a sulfur compound antioxidant is used often depending upon the purposes of use.;COPYRIGHT: (C)1999,JPO