| 摘要 |
PURPOSE:To provide an excellent initial color forming speed even at low temperatures, by using a solvent obtained by mixing p-monoisopropylbiphenyl with diisopropylnaphthalene in a specified ratio as a dye solvent for a pressure- sensitive recording paper. CONSTITUTION:A dye solvent for a pressure-sensitive recording paper is constituted of a mixture of 30-80wt% of p-monoisopropylbiphenyl and 70-20wt% of diisopropylnaphthalene. Though p-monoisopropylbiphenyl is substantially odorless and has an excellent property of dissolving dyes, the melting point thereof is 11 deg.C. To prevent p-monoisopropylbiphenyl from being crystallized at a low temperature, e.g., -5 deg.C, a specified amount of diisopropylnaphthalene is added thereto. If the amount of p-monoisopropylbiphenyl exceeds 80wt%, crystallization occurs at a low temperature, e.g., -5 deg.C. If the amount is less than 30wt%, a low-temperature color forming property, e.g., initial color forming ratio after 30sec from recording at -5 deg.C, does not reach a practical value. |
