Kanzaki Paper Manufacturing Co., Ltd.

Kanzaki Paper Mfg. Co., Ltd.

New Oji Paper Co, Ltd.

Yoshihiro Shimizu

Tetsuo Tsuchida

Naoto Arai

Katsuhiko Ishida

Yoshitaka Oeda

Haruo Omura

Ritsuo Mandoh

Takehiro Minami

Yasuyoshi Morita

Kohei Michikawa

Hisayoshi Mitoh

Yasuji Koga

Takuji Tuji

Toshio Kimura

Takashi Kawasaki

Tooru Yamamoto

Shuji Yoda

Masato Kawai

A heat-sensitive recording material comprises a recording layer containing a colorless or light-colored basic dye and a developing agent on a support. The recording layer further contains a polyethylene having a melting point not lower than 60.degree. C., which is obtained as an emulsion not comprising a surfactant. The heat-sensitive recording material may be prepared by coating on a support an aqueous coating composition, which contains a colorless or light-colored basic dye and a developing agent together with a polyethylene emulsion comprising a polyethylene having a melting point not lower than 60.degree. C. but no surfactant (e.g. emulsifier), to form a recording layer.

Heat-sensitive recording material

In the heat-sensitive recording material which has on a base sheet a heat-sensitive recording layer containing a colorless or pale colored chromogenic material and a color developer forming a color by reacting with the chromogenic material and a protective layer arbitrarily formed on the recording layer, a water-soluble graft copolymer of a polymer comprising at least one ethylenically unsaturated carboxylic acid unit and silicone is comprised in the recording layer and/or the protective layer.

A heat sensitive recording material having a recording layer formed on a substrate and containing a colorless or light-colored basic dye and a color acceptor, the heat sensitive recording material being characterized in that at least one ethyleneimine derivative of the following formula (1) is contained in the recording layer as a preservability improving agent for record images ##STR1## wherein R.sub.1 is direct bond, --O--, --S--, --SO.sub.2 -- or C.sub.1 .about.C.sub.6 alkylene, R.sub.2 and R.sub.3 are each C.sub.1 .about.C.sub.4 alkyl, C.sub.1 .about.C.sub.4 alkoxyl or halogen atom, m and n are each zero or an integer of 1 to 4.

Heat sensitive recording material

A heat-sensitive recording material comprising a substrate, an intermediate layer disposed on said substrate and a heat sensitive recording layer disposed on said intermediate layer, characterized in that said intermediate layer contains a pigment of 80 cc/100 g or more in oil absorption as the main constituent and an alkaline pigment of 8 or more in PH value in an amount of 0.1 to 25% by weight on the total amount of the pigments contained in said intermediate layer.

Disclosed is a heat-sensitive recording material comprising a support and a heat-sensitive recording layer, characterized in that an intermediate layer is formed between the support and the heat-sensitive recording layer wherein the intermediate layer comprises a pigment having an apparent specific gravity of about 0.7 g/cm.sup.3 or less and a polymeric substance having a glass transition temperature of 0.degree. C. or lower as a binder.

Heat-sensitive recording materials

A heat-sensitive record material having on a base sheet a recording layer which comprises a basic colorless chromogenic material and an acceptor in the state of that the colorless chromogenic material is contacted with the acceptor by heating to produce color images. The recording layer comprises at least one phenol compound represented by the following formula (I) together with the colorless chromogenic material and the acceptor, ##STR1## wherein each of R.sub.1, R.sub.2 and R.sub.3 radicals is hydrogen, C.sub.1-8 alkyl or C.sub.5-8 cycloalkyl, but at least one of R.sub.1, R.sub.2 and R.sub.3 radicals is C.sub.5-8 cycloalkyl; and each of R.sub.4, R.sub.5, R.sub.6, R.sub.7 and R.sub.8 radicals is hydrogen or C.sub.1-8 alkyl.

Heat-sensitive record material

Growing community of inventors

Nishinomiya, Japan

Yoshihiro Shimizu