| 摘要 |
PURPOSE:To make thermal response highly sensitive and enhance coloring density by adding a specific compound. CONSTITUTION:In a compound of formula (1), n is an integer of 0 or 1; R is a divalent base with 5 or larger carbon atoms; and Ar is an aryl group which can have a substitution group. For example, 2-benzyloxydibenzofran and phenethyloxydibenzofuran are recommended. The favorable dosage of a developer is 5 to 400wt.% for a dye precursor, especially 20 to 30wt.%. Above all, the most favorable dosage of the developer is 20 to 300wt.%. |
