USE OF DIPHENYLETHANE DERIVATIVE AS SOLVENT FOR COLOUR-FORMER IN PRESSURE-SENSITIVE RECORDING MATERIALS; SOLUTIONS, MICROCAPSULES, SHEETS COATED WITH MICROCAPSULES AND PRESSURE-SENSITIVE RECORDING MATERIALS CONTAINING SAID SOLVENT; METHOD OF COPYING USING SAID SHEETS OR RECORDING MATERIALS

摘要

Known pressure-sensitive recording materials cannot be used satisfactorily in severe environmental conditions, for example in hot and humid climates or in very cold climates. It has now been found that if 1-isopropylphenyl-2-phenylethane is employed as a solvent for a colour-former which is encapsulated in microcapsules which are coated onto a face of a sheet to form a pressure-sensitive recording material, excellent results can be obtained even in severe environmental conditions.