Improvements in or relating to polymer gels and method of making same

摘要

Pressure transferable ink compositions for the preparation of waxless carbon papers &c. comprise a polymer base material, colouring matter and a non-volatile non-drying carrier liquid which is at least partially compatible with the polymer and thereby swells the submicroscopic particles thereof which fuse at their contact points to form a microsponge gel. They may be prepared by solvent or dispersion polymerization of the monomer in the presence of the liquid in which the colouring matter is dissolved or dispersed, using heat and optionally catalysts such as azo bis(isobutyronitrile) or using ultra-violet light. Specified monomers include various acrylates and methacrylates including 1,3-butylene dimethacrylate and trimethylolpropane trimethacrylate, diallyl fumarate, vinyl chloride and vinylidene chloride, vinyl acetate, and vinyl butyral, acrylonitrile, styrene and vinyl toluene. The liquids may either be used singly or in combination, and in the latter case only one of the liquids need be compatible with the polymer. Specified liquids include various aliphatic and aromatic hydrocarbons, esters of phthalic, adipic, sebacic, maleic and phosphoric acids, methyl phthalylethyl glycollate, butyl stearate, chlorinated biphenyl, diethylene glycol, triethylene glycol, and ethylene glycol monohexyl ether. In examples alkali blue pigment is used and for coating on to paper, the compositions are mixed with attapulgite clay and alumina trihydrate, the resulting composition being applied to paper as for example a 0.0005 inch coating. The products are suitable for repeated use.ALSO:Pressure transferable ink compositions for the preparation of waxless carbon papers &c. comprise a polymer base material, colouring matter and a non-volatile non-drying carrier liquid which is at least partially compatible with the polymer and thereby swells the submicroscopic particles thereof. They may be prepared by solvent or dispersion polymerization of the monomer in the presence of the liquid in which the colouring matter is dissolved or dispersed, using heat and optionally catalysts such as azo bis(isobutyronitrile) or using ultraviolet light. Specified monomers include various acrylates and methacrylates including 1,3 -butylene dimethacrylate and trimethylolpropane trimethacrylate, diallyl fumarate, vinyl chloride and vinylidene chloride, vinyl acetate, and vinyl butyral, acrylonitrile, styrene and vinyl toluene. The liquids may either be used singly or in combination, and in the latter case only one of the liquids need be compatible with the copolymer. Specified liquids include various aliphatic and aromatic hydrocarbons, esters of phthalic, adipic, sebacic, maleic and phosphoric acids, methyl phthalylethyl glycollate, butyl stearate, chlorinated biphenyl, diethylene glycol, triethylene glycol, and ethylene glycol monohexyl ether. In examples alkali blue pigment is used and for coating on to paper, the compositions are mixed with attapulgite clay and alumina trihydrate, the resulting composition being applied to paper as for example a 0.0005 inch coating. The products are suitable for repeated use.