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US 5,145,721 AGranted
Method of coating an article with a polytetrafluoroethylene coating material
AssigneeHaruhiko Murakami
InventorsTakeshi Kojima, Taketoshi Nakajima
Life of this patent
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Abstract
A fluorine resin having relatively high melting point such as polytetrafluoroethylene and tetrafluoroethylene-perfluoroalkylvinylether copolymer resins is added to a polyester having the double bond of a polyisocyanate or dibasic acid with a polyhydric alcohol followed by stirring, and a coat of the resulting stirred mixture is applied to a plastic product or the like, whereby the fluorine resin is firmly held on the coated surface, and a film of the fluorine resin is formed on the coated surface.
Claims12
A method of coating an article, comprising the steps of:
- (a) diluting a two-liquid hardening type polyurethane resin coating material which includes a polyol (solution A) and a polyisocyanate (solution B) mixed together in the ratio of Solution A:Solution B=4:1, with thinner until the viscosity is 23 seconds as measured by a Ford cup (room temperature 20.degree. C.),
- (b) stirring the diluted coating material uniformly and pouring it into a coater while filtering with a 150-mesh filter net, followed by coating an article with the filtered material to form a base coat on the article,
- (c) naturally drying of the base coat until the solvent on the surface of the base coat is evaporated, then drying at 50.degree. C. by means of a dryer, and then cooling the surface of the base coat to 20.degree. C. or less,
- (d) adding 2-10 wt % of a polytetrafluoroethylene or polytetrafluoroethylene-perfluoroalkylvinylether copolymer resin to a polyester polyol or acrylic polyol, followed by stirring to obtain a solution C,
- (e) mixing a polyisocyanate with the solution C in a ratio of 1:1-4:1, stirring the mixture, and then coating the stirred mixture onto the cooled surface of the base coat to form a top coat on the base coat, and
- (f) initially drying the top coat at 60.degree. C. or less and then naturally drying the top coat.
3 more elements
A method of coating an article, comprising the steps of:
- (a) diluting a two-liquid hardening type polyurethane resin coating material, including a polyol (solution A) and a polyisocyanate (solution B) mixed in the ratio of solution A:solution B=4:1, with thinner until the viscosity is made 23 seconds as measured by a Ford cup (room temperature),
- (b) stirring the diluted coating material uniformly and pouring it into a coater while filtering with a 150-mesh filter net, followed by coating the article with the filtered material to form a base coat on the article,
- (c) naturally drying of the base coat until the solvent on the coating surface is evaporated, then drying at 50.degree. C. with a dryer, and then cooling the surface of the base coat to 20.degree. C. or less,
- (d) adding 2-10 wt % of a polytetrafluoroethylene or polytetrafluoroethylene-perfluoroalkylvinylether copolymer resin to an unsaturated polyester resin to obtain a solution C, followed by stirring,
- (e) mixing an oxidizing agent with the solution C, stirring the mixture and then coating the stirred mixture onto the cooled surface of the base coat to form a top coat on the base coat, and
- (f) initially drying the top coat at 60.degree. C. or less and then naturally drying the top coat.
3 more elements
Dependencies are inferred from the claim text.