COLORED RESIN COMPOSITION FOR WATER PIPE AND COLORED WATER PIPE

• Main Authors: NAGAI, YOZO, NAKAMURA, MITSUO, MATSUOKA, TOHRU, OHSHIMA, KOTARO
• Format: Patent
• Language: English; French; German
• Published: 08.01.2003
• Edition: 7
• Subjects: BLASTING; CHEMISTRY; COMPOSITIONS BASED THEREON; ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVEFUNCTIONING OF MACHINES OR INSTALLATIONS; HEATING; JOINTS OR FITTINGS FOR PIPES; LIGHTING; MEANS FOR THERMAL INSULATION IN GENERAL; MECHANICAL ENGINEERING; METALLURGY; ORGANIC MACROMOLECULAR COMPOUNDS; PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; THEIR PREPARATION OR CHEMICAL WORKING-UP; THERMAL INSULATION IN GENERAL; USE OF INORGANIC OR NON-MACROMOLECULAR ORGANIC SUBSTANCES ASCOMPOUNDING INGREDIENTS; WEAPONS

A colored resin composition for water pipes which comprises (A) a polyethylene resin and, per 100 parts by weight of the polyethylene resin, (B) 0.01 to 2.0 parts by weight of (i) a cobalt blue pigment, 0.0001 to 0.2 parts by weight of (ii) at least one pigment selected from phthalocyanine pigments having no metals and metal phthalocyanine pigments having no chlorine atoms or one chlorine atom in a molecule, 0.0001 to 0.2 parts by weight of (iii) a dioxazine pigment and 0.002 to 0.5 parts by weight of (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 in accordance with the method of Japanese Industrial Standard K 6762 for 500 hours. The colored resin composition for water pipes and the colored 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.