GB958081A - Pressure operative transfer sheets containing treated pigments - Google Patents

Abstract

A process for making carbon black pigment more oleophilic comprises mixing a watersoluble salt of an amine containing at least one chain of at least 10 carbon atoms with a dispersion of the pigment in an aqueous solution of a carboxylic acid salt which has a deflocculating action on the pigment dispersion. The amine salt may be the hydrochloride or acetate of decylamine, dodecylamine, cetylamine, oleylamine, N-oleylpropylenediamine or a mixture obtained by reduction of the nitriles from carboxylic acid mixtures from natural sources. The carboxylic acid salt may be the alkali metal, ammonium, ethanolamine or triethanolamine salts of stearic, palmitic, oleic, linoleic, myristic or abietic acids, polymers of linoleic acid, rosin, modified rosins or tall oil. 90% of the pigment particles may be less than 2 microns in diameter. The oil may be mineral, animal or vegetable oils. In Examples 1, 3 and 4 an aqueous dispersion of carbon black is mixed with potassium rosinate solution and a solution in acetic acid of a mixture of amines obtained by reduction of the mixed nitriles from tallow fatty acids, and cetylamine or N-olelylpropylene diamine with or without mineral oil. The pigments in dry or paste form, are mixed with mineral oil, toluene, methyl ethyl ketone and a copolymer of vinyl chloride and vinyl acetate, and the resultant composition applied to paper tissues.ALSO:A composition for coating paper tissues to produce waxless carbon papers comprises a mixture of a pigment-oil dispersion with a solution of a copolymer of vinyl chloride and vinyl acetate, which pigment has been made more oleophilic by mixing a water-soluble salt of an amine containing at least one chain of at least 10 carbon atoms with a dispersion of the pigment in an aqueous solution of a carboxylic acid salt which has a deflocculating action on the pigment dispersion. The amine salt may be the hydrochloride or acetate of decylamine, dodecylamine, cetylamine, oleylamine, N-oleylpropylenediamine or a mixture obtained by reduction of the nitriles from carboxylic acid mixtures from natural sources. The carboxylic acid salt may be the alkali metal, ammonium, ethanolamine or triethanolamine salts of stearic, palmitic oleic, linoleic, myrietic or abietic acids, polymers of linoleic acid, rosin, modified rosine or tall oil. The pigment may be carbon black or an organic pigment of the azophthalocyanine, anthraquinone, thioindigoid or polycyclic series. 90% of the pigment particles may be less than 2 microns in diameter. The oil may be mineral, animal or vegetable oils. In Examples 1, 3 and 4 an aqueous dispersion of carbon black is mixed with potassium rosinate solution and a solution in acetic acid of a mixture of amines obtained by reduction of the mixed nitriles from tallow fatty acids, and cetylamine or N-oleylpropylene diamine with or without mineral oil. In Examples 5 and 6 an aqueous paste of copper chlorophthalocyanine is mixed with a solution in potassium hydroxide of dibasic fatty acids obtained by dimerisation of naturally occurring fatty acids containing 18 carbon atoms per molecule and a solution of cetylamine in dilute acetic acid with or without mineral oil. In Example 7 an aqueous paste of Rubine Toner is mixed with sodium dodecyl benzenesulphonate solution, potassium rosinate solution and a solution of cetylamine in acetic acid. The pigments in dry or paste form, are mixed with mineral oil, toluene, methyl ethyl ketone and a copolymer of vinyl chloride and vinyl acetate, and the resultant composition applied to paper tissues.ALSO:A process for making pigments more oleophilic comprises mixing a water-soluble salt of an amine containing at least one chain of at least 10 carbon atoms with a dispersion of a pigment in an aqueous solution of a carboxylic acid salt which has a deflocculating action on the pigment dispersion. The amine salt may be the hydrochloride or acetate of decylamine, dodecylamine, cetylamine, oleylamine, N-oleylpropylenediamine or a mixture obtained by reduction of the nitriles from carboxylic acid mixtures from natural sources. The carboxylic acid salt may be the alkali metal, ammonium, ethanolamine or triethanolamine salts of stearic, palmitic oleic, linoleic, myristic or abietic acids, polymers of linoleic acid, rosin, modified rosins or tall oil. The pigment may be carbon black or an organic pigment of the azo, phthalocyanine, anthraquinone, thioindigoid or polycyclic series, 90% of the pigment particles may be less than 2 microns in diameter. The oil may be mineral, animal or vegetable oils. In Examples 1, 3 and 4, an aqueous dispersion of carbon black is mixed with potassium rosinate solution and a solution in acetic acid of a mixture of amines obtained by reduction of the mixed nitriles from tallow fatty acids, and cetylamine or N-olelylpropylene diamine with or without mineral oil. In Examples 5 and 6 an aqueous paste of copper chlorophthalocyanine is mixed with a solution in potassium hydroxide of dibasic fatty acids obtained by dimerization of naturally occurring fatty acids containing 18 carbon atoms per molecule and a solution of cetylamine in dilute acetic acid with or without mineral oil. In Example 7 an aqucous paste of Rubine Toner is mixed with sodium dodecyl benzenesulphonate solution, potassium rosinate solution and a solution of cetylamine in acetic acid. The pigments in dry or paste form, are mixed with mineral oil, toluene, methyl ethyl ketone and a copolymer of vinyl chloride and vinyl acetate, and the resultant composition applied to paper tissues.ALSO:Waxless carbon papers are prepared by coating paper tissues with a mixture of a pigment-oil dispersion with a solution of a synthetic polymer, which pigment has been made more oleophilic by mixing a water-soluble salt of an amine containing at least one chain of at least 10 carbon atoms with a dispersion of the pigment in an aqueous solution of a carboxylic acid salt which has a deflocculating action on the pigment dispersion. The amine salt may be the hydrochloride or acetate of decylamine, dodecylamine, cetylamine, oleylamine, N-oleyl-propylenediamine or a mixture obtained by reduction of the nitriles from carboxylic acid mixtures from natural sources. The carboxylic acid salt may be the alkali metal, ammonium, ethanolamine or triethanolamine salts of stearic, palmitic oleic, linoleic, myristic or abietic acids, polymers or linoleic acid, rosin, modified rosins or tall oil. The pigment may be carbon black or an organic pigment of the azo, phthalocyanine, anthraquinone, thioindigoid or polycyclic series. 90% of the pigment particles may be less than 2 microns in diameter. The oil may be mineral, animal or vegetable oils. In Examples 1, 3 and 4 an aqueous dispersion of carbon black is mixed with potassium rosinate solution and a solution in acetic acid of a mixture of amines obtained by reduction of the mixed nitriles from tallow fatty acids, and cetylamine or N-olelylpropylene diamine with or without mineral oil. In Examples 5 and 6 an aqueous paste of copper chlorophthalocyanine is mixed with a solution in potassium hydroxide of dibasic fatty acids obtained by dimerisation of naturally occurring fatty acids containing 18 carbon atoms per molecule and a solution of cetylamine in dilute acetic acid with or without mineral oil. In Example 7 an aqueous paste of Rubine Toner is mixed with sodium dodecyl benzenesulphonate solution, potassium rosinate solution and a solution of cetylamine in acetic acid. The pigments in dry or paste form, are mixed with mineral oil, toluene, methyl ethyl ketone and a copolymer of vinyl chloride and vinyl acetate, and the resultant composition applied to paper tissues.