Solvent for chromogenic dye-precursor material for pressure-sensitive recording paper.

摘要

A substantially odorless solvent for a chromogenic dye-precursor material for a pressure-sensitive recording paper consists essentially of (1) 30 to 80% by weight of p-monoisopropylbiphenyl or of a biphenyl mixture which is composed of not less than 80% by weight of p-monoisopropylbiphenyl not more than 20% by weight of m-monoisopropylbiphenyl and not more than 10% by weight of diisopropylbiphenyl and which is substantially completely devoid of o-monoisopropylbiphenyl, and (2) 70 to 20% by weight of diisopropylnaphthalene or of a naphthalene mixture which is composed of not less than 97% by weight of diisopropylnaphthalene, not more than 1% by weight of monoisopropylnaphthalene and not more than 2% by weight of triisopropylnaphthalene.