Kanzaki Paper Manufacturing Co., Ltd.

Naoki Yonese

Mitsuru Kondo

Masayuki Omatsu

Nobuo Kanda

Tosaku Okamoto

Yukio Takayama

Mikio Nakamura

Masato Kawamura

The heat-sensitive record materials have, between the base sheet and the recording layer, a middle layer which mainly comprises a binder and at least one pigment having an oil absorption of at leasat 80 cc/100 g measured by JIS K 5101. The middle layer comprises an acrylic thickener in an amount of 0.05 to 5 parts by weight per 100 parts by weight of the pigment on dry basis. The middle layer is formed by blade-coating on a base sheet a coating composition comprising at least one pigment having an oil absorption of at least 80 cc/100 g measured by JIS K 5101 and a binder, in which an acrylic thickener is comprised in such amount as described above.

Heat-sensitive record material and method for producing it

Disclosed is a two-color heat-sensitive recording material which comprises a base sheet and a recording layer of single-layer or multi-layer structure formed on the base sheet, the recording layer comrising:

Two-color heat-sensitive recording material with

A new phthalide derivative useful as a colorless chromogenic material has the following formula: ##STR1## wherein A and n have the same meaning as defined hereinbefore.

Phthalide derivatives useful as colorless chromogenic material

Cycloalkyl aminophenol derivatives are produced by reacting o-, m- or p-aminophenol with a cycloalkanone having 5 to 12 carbon atoms in the presence of a reducing agent and preferably with the addition of an acid.

Method for producing cycloalkyl aminophenol derivatives

Fluoran compounds of the structural formula: ##STR1## wherein R.sub.1 is propyl or butyl, R.sub.2 is an alkyl of from one to four carbon atoms, R.sub.3 is methyl or ethyl, and R.sub.4 is hydrogen or methyl are particularly suitable for use in providing high quality pressure, heat or electrothermal sensitive recording sheets containing a color former in operative association with an electron-accepting substance.

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Nishinomiya, Japan

Naoki Yonese