Sanko Co., Ltd.

Yoshito Nakagawa

Shigeru Oda

Eiji Kawabata

Ryoichi Kinishi

Yoshimi Ishibashi

Hiroshi Sumitomo

Takaaki Mori

Tjangkie Tan

Tjang Kie Tan

A heat-sensitive recording material includes a heat-sensitive recording layer containing a basic dye and a developer and provided on a supporting body, in which the developer is at least one type of an N-substituted amino acid derivative represented by the following General Formula: (R&#x2014;X)&#x2014;Y&#x2014;(Z). . . (1) (In Formula (1), R represents an alkyl group or an aryl group which may have a substituent. X is a group bonded to the N-terminus of Y, and represents &#x2014;OCO&#x2014;, &#x2014;SONHCO&#x2014;, &#x2014;NHCO&#x2014;, &#x2014;NHCS&#x2014;, or &#x2014;SO&#x2014;. Y represents an amino acid residue or a peptide residue. Z represents a group bonded to the C-terminus of Y and represents an OH group or an OR&#x2033; group. When Y is an amino acid residue other than a cystine residue or when Y is a peptide residue not having a cystine residue, m=1, and when Y is a peptide residue having n cystine residues, m=n+1 and n is 1 or 2.)

Heat-sensitive recording material

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&#x2dc;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.

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

The invention provides a heat-sensitive recording material, which is highly sensitive, is almost free of staining on the background, and gives a recorded image excellent in stability during storage, by using a finely divided sensitizer dispersion excellent in shelf stability produced in a short time with high volumetric efficiency. The invention relates to a method of producing a sensitizer dispersion, which comprises emulsifying and finely dividing a heat-sensitive recording sensitizer by melting under heating in an aqueous emulsifying dispersant, and then crystallizing the finely divided emulsified dispersion under rapid cooling, wherein the sensitizer is at least one member 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, and &#x3b2;-naphthyl benzyl ether.

Method for producing material containing sensitizer dispersed therein for thermal recording article and a thermal recording article

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Osaka, Japan

Yoshito Nakagawa