| 摘要 |
A polyalkylene container has a surface coated with a cured epoxy resin. The coating may be applied in solution in an organic solvent to the inside or the outside of the container or both, by spraying, dipping or flushing, and is cured by heat, irradiation, or both; when irradiation is used, graft polymerisation between the coating and the substrate may take place. The surface may be pretreated with sodium dichromate and sulphuric acid, or with ozone or nitrous oxide or mixtures of the two, or by flaming. Epoxy resins specified are the reaction products of polyhydric phenols, e.g. resorcinol, hydroquinone, catechol, phloroglucinol, bis-phenol A, p, p1-dihydroxy-1, 11-dinaphthyl methane, polyhydroxy naphthalenes and anthracenes, o, o1, p, p1-tetrahydroxy diphenyl dimethyl methane and p-hydroxyphenyl p-hydroxy m-(p-hydroxyphenyl) phenyl-dimethyl methane, with epihalohydrins, e.g. epichlorhydrin, epibromolhydrin, and the epihalohydrins of mannitol, sorbitol or o erythritol: mixtures of epoxy resins are disclosed in several Examples. Solvents disclosed are acetone, methyl ethyl ketone, methyl isobutyl ketone, diacetone alcohol, cyclohexanone and toluene. Hardeners disclosed are methylene bis-(4-phenyl) isocyanate, glyoxal, dimercaptans, m-phenylene diamine, diethylene triamine and the reaction products of diethylene triamine with acrylonitrile, polymerized fatty acids or the diglycidyl ether of bisphenol A. The resins may also be modified with styrene oxide or 2, 3-epoxy-1-propanol. In Example (9) an alcoholic urea-formaldehyde resin dissolved in xylol/butanol is also added to the resin solution. U.S.A. Reissue Specification 24,062 is referred to.ALSO:A polyalkylene container has a surface coated with a cured epoxy resin. The coating may be applied in solution in an organic solvent to the inside or the outside of the container or both, by spraying, dipping or flushing, and is cured by heat, irradiation, or both; when irradiation is used, graft polymerisation between the coating and the substrate may take place. The surface may be pretreated with sodium dichromate and sulphuric acid, or with ozone or nitrous oxide or mixtures of the two, or by flaming. In examples, polyethylene bottles are lined with epoxy resin containing a complex amine-type hardener, or with epoxy resin, hardener, and an alcoholic type urea-formaldehyde resin, or with epoxy resin, the reaction product of polymeric fat acids and diethylene triamine, and hardener, or with epoxy resin, hardener, and styrene oxide, and cured by heating in each case; and polymethylene bottles are lined with epoxy resin and hardener, and cured by heating. In every case the resistance of the bottle to permeation by organic liquids was increased. U.S.A. Re-issue Specification 24,062 is referred to. |
