Mitsubishi Chemical Corporation

Nippon Paper Industries Co., Ltd.

Mai Higuchi

Yukiko Sato

Yoshimi Midorikawa

Mamoru Suga

Keiichiro Inada

Akihito Ogino

Katsuto Ohse

Yoshimune Aosaki

The present invention provides a compound represented by the formula (1). The compound represented by the formula (1) is a developing agent superior in both color-developing sensitivity with low energy and image stability [in the following formula, wherein Ris a hydrogen atom, an alkyl group, an alkenyl group, an aryl group or an aralkyl group, 

Phenolsulfonic acid aryl ester, developing agent, and heat-sensitive recording material

The invention provides a phenolsulfonic acid aryl ester represented by formula (1) wherein each symbol is as defined in the description. The phenolsulfonic acid aryl ester is useful as a developer to provide a thermal recording material with good color-developing sensitivity, image density when printed at a low application energy (i.e., high start-up sensitivity), and heat and plasticizer resistance. The invention also provides a thermal recording material using the developer.

Phenolsulfonic acid aryl ester derivative, and heat-sensitive recording material using same

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Chikujo-gun, Japan

Mai Higuchi