Kanzaki Paper Manufacturing Co., Ltd.

Kanzaki Paper Mfg. Co., Ltd.

Hisayoshi Mitoh

Ritsuo Mandoh

Katsuhiko Ishida

Takehiro Minami

Yoshihiro Shimizu

Takuji Tuji

The present invention provides a heat sensitive recording material comprising a substrate, a recording layer formed over the substrate and containing a colorless or light-colored basic dye and a color acceptor, and a protective layer formed over the recording layer, the recording material being characterized in that microcapsules having an ultraviolet absorber enclosed therein and having substantially no color forming ability are incorporated in the protective layer. Further, the present invention provides microcapsules having an ultraviolet absorber and as required an organic solvent enclosed therein, which have capsule wall film of synthetic resin and mean particle size of 0.1 to 3 .mu.m.

Microcapsule containing ultraviolet absorber

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.

Heat-sensitive recording material

Heat sensitive recording material using microcapsules containing

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Nagaokakyo, Japan

Hisayoshi Mitoh