Sanko Co., Ltd.

Ryoichi Kinishi

Yoshimi Ishibashi

Yoshito Nakagawa

Yoshitaka Fujino

Takamichi Oishi

The present invention relates to an N,N′-diurea derivative represented by the following general formula (1) and a method for producing the same. In addition, the present invention relates to a thermosensitive recording material in which a thermosensitive recording layer including a basic dye which is colorless or lightly colored at room temperature and a developer capable of developing color upon contact with the basic dye by heating is provided on a base sheet, wherein the developer is the N,N′-diurea derivative represented by the following general formula (1):

N,N′-diarylurea derivative, manufacturing method thereof, and thermosensitive recording material using same

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.)

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Osaka, Japan

Ryoichi Kinishi