SENSITIZER PARTICLE DISPERSION FOR THERMOSENSITIVE RECORDING MEDIUM COMPOSED MAINLY OF STEARIC ACID AMIDE, PREPARATION METHOD THEREOF, MIXED DISPERSION COMPOSITION FOR THERMOSENSITIVE RECORDING LAYER, AND THERMOSENSITIVE RECORDING MEDIUM

摘要

A sensitizer particle dispersion containing stearic acid amide, a preparation method thereof, a mixed dispersion composition for a thermosensitive recording layer using the sensitizer particle dispersion, and a thermosensitive recording medium using the mixed dispersion composition are provided. The sensitizer particle dispersion can be safely prepared under atmospheric pressure by mixing stearic acid amide and another sensitizer at a mass ratio of 95:5˜51:49; co-melting the mixture by heat in emulsifier-dispersed water, whereby the mixture is unified and emulsified into particles, or emulsifying the co-melted mixture of stearic acid amide and the other sensitizer unified by co-melting the mixture by heat, into particles in emulsifier-dispersed water; and quenching the obtained emulsified dispersion, thus crystallizing sensitizer particles from the emulsified particles.

主权项

1. A method of preparing a sensitizer particle dispersion for a thermosensitive recording medium composed mainly of stearic acid amide, comprising:
mixing stearic acid amide with another sensitizer other than stearic acid amide, at least one selected from the group consisting of 1,2-bis(phenoxy)ethane, 1,2-bis(3-methylphenoxy)ethane, 1,2-bis(4-methylphenoxy)ethane, p-benzylbiphenyl, di-p-methylbenzyl oxalate, β-naphthylbenzylether and diphenylsulfone at a mass ratio of 95:5˜51:49, thus obtaining a mixture; co-melting the obtained mixture by heat in emulsifier-dispersed water, so that the stearic acid amide and the other sensitizer are unified and emulsified into particles, or emulsifying a co-melted mixture of the stearic acid amide and the other sensitizer unified by co-melting the mixture by heat, into particles in emulsifier-dispersed water, thus obtaining an emulsified dispersion; and quenching the emulsified dispersion, thus crystallizing sensitizer particles from the emulsified particles.