Polyacetal resin molded article having reduced water contamination
AssigneePolyplastics Co., Ltd.
InventorKenzi Matsumi
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Abstract
A polyacetal resin molded article having reduced water contamination is disclosed. The water contamination reduction feature is provided by the inclusion of a substantially water insoluble substance which forms a hydrophobic film on the molded article. It is furthermore required that the water insoluble substance-included polyacetal molded article be heat treated in air or in an inert gas to provide reduced water contamination.
Claims21
A polyacetal resin molded article which exhibits reduced water contamination when in contact with water, said molded article bearing a hydrophobic film upon the surface thereof, said molded article being formed by molding a substantially homogeneous polyacetal resin composition comprising an intimate admixture of a polyacetal resin and a substantially water insoluble substance selected from the group consisting of paraffins, silicon oils, fluorinated oils, metal soaps, higher fatty acid bisamides, higher alcohols, higher fatty acid ethers, and mixtures of two or more of the above, and heating said molded article in air or an inert gas to a temperature within the range of about 80.degree. C. to 130.degree. C. whereby said water insoluble substance forms said hydrophobic film.
A molded article comprised of a polyacetal resin which exhibits reduced water contamination when in contact with water as well as hydrophobic surface properties, said article being prepared by molding a substantially homogeneous polyacetal resin composition comprising an intimate admixture of said polyacetal resin and a substantially water insoluble substance selected from the group consisting of paraffins, silicon oils, fluorinated oils, metal soaps, higher fatty acid bisamides, higher alcohols, higher fatty acid ethers and mixtures of two or more of the above, and heating said molded article in air or in an inert gas to a temperature within the range of about 80.degree. C. to 130.degree. C. whereby said hydrophilic surface properties are provided.
A method for forming a molded article comprised of a polyacetal resin bearing a hydrophobic film thereon and which exhibits reduced water contamination when in contact with water, said method comprising forming a molded article comprised of an intimate admixture of said polyacetal resin and a substantially water insoluble substance selected from the group consisting of paraffins, silicon oils, fluorinated oils, metal soaps, higher fatty acid bisamides, higher alcohols, higher fatty acid ethers and mixtures of two or more of the above, and heating said molded article in air or in an inert gas to a temperature in the range of about 80.degree. C. to 130.degree. C. whereby said water insoluble substance forms said hydrophobic film.
Dependencies are inferred from the claim text.