Other

Showa Denko Kabushiki Kaisha

Yozo Nagai

Minoru Takaishi

Tohru Matsuoka

Mitsuo Nakamura

Mitsunobu Machida

Tsutomu Suda

Kotaro Oshima

Tomio Takada

Noboru Takagi

A colored resin composition for water pipes which comprises (A) a polyethylene resin and (B) specific amounts of (i) a cobalt blue pigment, (ii) at least one selected from phthalocyanine pigments having no metals and metal phthalocyanine pigments having no chlorine atoms or one chlorine atom in a molecule, (iii) a dioxazine pigment and (iv) a titanium dioxide pigment and a colored water pipe which comprises the colored polyethylene resin composition and has a color tone within a specific color solid expressed by the values of the Munsell standard color table before and after the test of resistance to chlorine water for 500 hours. The composition and the water pipe are colored in a bluish color and exhibits an excellent hiding property, excellent fastness of the color tone of the coloring component to water containing chlorine and an excellent property for preventing formation of blisters in water containing chlorine.

Colored resin composition for water pipe and colored water pipe

A propylene polymer composition comprising (A) a modified propylene polymer obtained by treating: (1) 100 parts by weight of a propylene polymer or a mixture of a propylene homopolymer and a ethylene-propylene copolymer rubber, with (2) 0.1 to 50 parts by weight of an organic compound having at least one unsaturated bond in the molecule and a hydroxyl group and (3) 0.01 to 20 parts by weight of an organic peroxide; and (B) a propylene polymer, wherein content of the component (A) in the composition is 5 to 50% by weight. This composition may further contain one or more of (C) an amorphous ethylene-propylene copolymer having a propylene content of 20% to 50% by weight and a Mooney viscosity ML.sub.1+4 at 100.degree. C. of 20 to 100, (D) a high-density ethylene copolymer having a density of 0.935 g/cm.sup.3 or more, (E) a linear low-density ethylene copolymer having a density of not less than 0.900 g/cm.sup.3 but less than 0.935 g/cm.sup.2, a melting point of 106.degree. C. to 130 C., a melt flow rate of 0.01 to 100 g/10 min. and substantially having 3 to 35, based on 1,000 carbon atoms of the backbone carbon chain, of the side-chain alkyl groups having 1 to 10 carbon atoms, and (F) an inorganic filler. The resultant composition has not only an excellent adhesion to polyurethane without the use of a primer, but also has a good weathering resistance.

Propylene polymer composition

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Tokyo, Japan

Yozo Nagai