| 摘要 |
928,324. Perforating films. SANZEN SEISHI KABUSHIKI KAISHA. Nov. 14, 1961 [Nov. 25, 1960; Sept. 12, 1961], No. 40710/61. Class 31 (2). Fine particles of a solvent are applied to the surface of a polymeric film and on application of heat they dissolve portions of the film giving a permeable sheet. The vicosity and surface tension of the solvent particles are adjusted so that the particles do not merge. This may be carried out by dispersing fine particles of materials in the solvent such as talc, zinc oxide, acid clay, diatomaceous earth, magnesia, aluminium, carboxymethyl cellulose or polyvinyl alcohol. Alternatively, viscosity agents such as paraffin, castor oil, polyvinyl alcohol, rubber, polystyrene polyvinyl chloride or polyvinyl acetate and tension agents such as chlorobenzene, bromobenzene, and bromonaphthalene, glycerine, ethylene glycol, formamide, aniline, nitrobenzene or benzaldehyde may be added. Solvents specified are tetrahydronaphthalene, decahydronaphthalene trichloroethylene tetrachloroethylene, carbon tetrachloride, xylene, chlorobenzene, fluid paraffin, cyclohexanone, methyl cyclohexanone, dimethyl formamide, nitrobenzene, tetrahydrofuran toluene, formic acid, phenol or metacresol. Polymeric films may be polymers or copolymers of ethylene, vinyl chloride, nylon propylene and styrane. |
