GB445701A - Improvements in the production of printing inks comprising the dispersion of pigments in oils - Google Patents

Abstract

Printing-ink is produced by dispersing a pigment in an oil, to which is added a salt of a multiple unsaturated higher fatty acid with an alkali, ammonia, or organic base, in an amount, e.g. not more than 5 per cent calculated on the weight of the pigment, sufficient to increase the dispersion of pigments in the oil. The acid component of the salt may be linseed oil fatty acid, or the fatty acids of chinawood oil, whale oil, and liver oil, including linoleic, linolenic, eleostearic, and clupanodonic acid. As organic base component there may be used mono-, di,- and tri-ethanolamine or propanolamine. The salt may be neutral or acid. The addition results in smoothness and easier printing quality of the ink, and a lowering of viscosity particularly when mineral oil is present, and enables the amount of pigment to be increased. In an example a printing ink containing Milori blue, methylene blue varnish, aluminium hydroxide in oil, blown linseed oil varnish, and manganese borate, is mixed with a small quantity of triethanolamine eleostearate, or the triethanolamine salt of linseed, menhaden, or whale oil fatty acid. Potassium, sodium, or ammonium salts may be used. Specification 183,177, [Class 95], is referred to. The Specification as open to inspection under Sect. 91 comprises also the use of salts of bean oil fatty acid, and of salts in which the acid is neutralized to the extent of only one fourth to one half. An example is given of a printing ink containing soot, mineral oil, stand oil, and asphalt, to which is added a small quantity of the three-quarter acid salt of linseed oil fatty acid and potassium. This subject-matter does not appear in the Specification as accepted.