Patent GB-592542-A (GB)
Title: The colouring of surfaces of vinyl chloride polymer compositions
IPC: D06P1/651
Filed: 1945-05-03
Abstract: The surfaces of polyvinyl chloride compositions (see Group IV) are coloured by applying a solution or suspension of one or more colouring materials dissolved or suspended in a liquid with which the compositions are miscible and of b.p. less than 220 DEG C. at 5 mm. pressure, and allowing the liquid to penetrate the surface. Preferably the liquid has a b.p. between 200 DEG C. and 360 DEG C. at 760 mm. pressure, e.g., dimethyl phthalate, dibutyl phthalate and dibutyl sebacate; other suitable liquids are methylene and ethylene dichlorides, monochlorbenzene, monomeric methyl methacrylate, tetrahydrofuranes, tetrahydropyranes, dioxolane, dioxane, mesityl oxide, cyclopentanone, cyclohexanone, nitroparaffins and dimethyl formamide.  Solutions of dyes may be used, but pigments, e.g., iron or chromium oxide or finely powdered metals, are best applied as a paste of base pigment, e.g., zinc oxide, with the liquid.  The process is applicable to pigmented polyvinyl chloride compositions and is of particular use in the production of surgical prosotheses, e.g., noses and ears. Dye solutions may be applied by brushing or patterned effects may be obtained by means of a pad of cotton wool wetted with solution applied to a stencil covering a polyvinyl chloride sheet or they may be coated upon a printing plate and transferred to the polyvinyl chloride surface in the usual way. Specification 570,915, [Group IV], is referred to.ALSO:The surfaces of polyvinyl chloride compositions are coloured by applying a solution or suspension of one or more colouring materials dissolved or suspended in a liquid with which the compositions are miscible and of b.p. less than 220 DEG  C. at 5 mms. pressure, and allowing the liquid to penetrate the surface.  The polyvinyl chloride compositions comprise gelatinized mixtures of one or more polymers of vinyl chloride or interpolymers thereof with one or more ethylenically unsaturated compounds and one or more non-volatile plasticising agents, e.g. dibutyl phthalate or tricresyl phosphate.  Preferably, the liquid has a b.p. between 200 DEG  and 360 DEG  C. at 760 mms. pressure, specified are dimethyl phthalate, dibutyl phthalate and dibutyl sebacate; other liquids suitable are methylene and ethylene dichlorides, monochlorbenzene, monomeric methyl methacrylate, tetrahydrofuranes, tetrahydropyranes, dioxolane, dioxane, mesityl oxide, cyclopentanone, cyclohexanone, nitroparaffins and dimethyl formamide.  Solutions of dyes may be used, but pigments, e.g. iron or chromium oxide or finely powdered metals, are best applied as a paste of base pigment, e.g. zinc oxide, with the liquid.  The process is applicable to pigmented polyvinyl chloride compositions and is of particular use in the production of surgical prostheses, e.g. noses and ears.  Dye solutions may be applied by brushing or patterned effects may be obtained by means of a pad of cotton wool wetted with solution applied to a stencil covering a polyvinyl chloride sheet, or they may be coated upon a printing plate and transferred to the polyvinyl chloride surface in the usual way.  Specification 570,915 is referred to.