Oji Paper Co., Ltd.

New Oji Paper Co, Ltd.

Yasuyoshi Morita

Kohei Michikawa

Masaaki Matsuoka

Kyoko Koyabu

Kunitaka Toyofuku

Yoshihiro Shimizu

Takehiro Minami

Satoshi Fukui

Masato Kawai

Tatsuya Murata

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

A heat-sensitive recording material with a satisfactory whiteness and an enhanced heat-sensitivity is produced by a process comprising the steps of preparing a coating liquid containing a dye-precursor dispersion and a color developer dispersion, coating a surface of a sheet substrate with the coating liquid and solidifying the resultant coating liquid layer on the sheet substrate, in which process at least one member of the dye-precursor and the color developer is finely pulverized by at least one dispersing operation, in the presence of a pulverizing medium consisting of a number of solid grains having a diameter of 0.9 mm or less, into fine particles having an average size of 0.7 .mu.m or less.

Process for producing heat-sensitive recording material

In a heat-sensitive recording paper having a heat-sensitive color-forming layer formed on substrate paper, said substrate paper is impregnated with pigment particles in its surface and said pigment particles are made to present between surface fibers or said substrate paper for the purpose of providing high sensitivity without causing any undesired transfer of tailings to the thermal head.

Heat-sensitive recording paper

A heat-sensitive recording material in which a heat-sensitive recording layer containing a colorless to light-colored basic Leuco dyestuff and a color developer is tightly contacted with a thermal head to effect color development, characterized in that ammonium zirconyl carbonate is contained in said heat-sensitive color-developing layer or in an undercoating layer so as to offer a heat-sensitive recording material which is superior in its high speed printing properties and free from printing hindrances caused by smudge deposition or sticking.

A composition useful for rapidly and safely effecting a fat-desensitizing treatment for litho printing plates with a high efficiency, and for providing a hydrophilic membrane having a high durability in printing operations on the surfaces of the litho printing plates, comprises (A) a phytic acid or its functional derivative; (B) a metal salt of the formula MX.sub.1, wherein M=a divalent metal cation, X=monovalent or divalent anion and 1=1 or 2; (C) a glycol compound of the formula, ##STR1##

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Saitama, Japan

Yasuyoshi Morita