Pipe inner surface coating composition
AssigneeMitsui Petrochemical Industries, Ltd.
InventorHiroshi Iizuka
Life of this patent
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Abstract
A curable component composed of (A) an epoxy resin containing at least 90% by weight of a bisphenol glycidyl ether and (B) an aliphatic polyamine is blended with (C) 1-xylyl-1,3-diphenylbutane, bis(.alpha.-methylbenzyl)xylene, and/or 1-xylyl-1-(3-.alpha.-methylbenzylphenyl)ethane, and (D) a coloring pigment and/or an inorganic filler to form a coating composition adapted to be coated to the inner surface of pipes through which city water passes. The composition is cured to the pipe inner surface to form a film which provides a chlorine take-up of up to 1 ppm from city water flowing in contact with the film.
Claims7
A coating composition for forming a film on the inner surface of a pipe through which chlorine-containing water passes, the film coating when cured absorbing or consuming no more than 1 part per million chlorine, the coating composition comprising:
- (A) an epoxy resin containing at least 90% by weight of a bisphenol glycidyl ether, the epoxy resin containing epoxy groups;
- (B) an aliphatic polyamine compound sufficient to provide 0.5 to 0.9 equivalent of active hydrogen per equivalent of the epoxy group of said epoxy resin;
- (C) about 3 to about 20 parts by weight per 100 parts by weight of the sum of components (A) and (B) of at least one member selected from the group consisting of 1-xylyl-1,3-diphenyl-butane, bis(.alpha.-methylbenzyl)xylene and 1-xylyl-1-(3-.alpha.-methyl-benzylphenyl)ethane;
- and
- (D) at least one member selected from the group consisting of a coloring pigment and an inorganic filler.
Dependencies are inferred from the claim text.