Fuji Photo Film Company, Limited

Shojiro Watanabe

Fumiaki Shinozaki

Keiso Saeki

Hiroharu Matsukawa

Tomizo Namiki

Hirofumi Mitsuo

A method of preparing a color developer sheet for pressure-sensitive recording is described. The method comprises preparing Coating Solutions A and B separately. Coating Solution A is prepared by dissolving an aromatic carboxylic acid metal salt in an organic solvent and emulsifying the resulting solution in water. Coating Solution B is prepared by mechanically dispersing an aromatic carboxylic acid metal salt in an aqueous system. Coating Solutions A and B are then mixed in such a manner that the weight ratio of the amount of the aromatic carboxylic acid metal salt in Coating Solution A to that of the aromatic carboxylic acid metal salt in Coating Solution B is from 10:90 to 90:10. The resulting mixture is then coated on a support. This color developer sheet shows high developing ability and a high color-forming rate, produces a colored member of high light resistance, and when used as an intermediate sheet, is reduced in the formation of fog.

Method of preparing color developer sheets

A heat-sensitive recording paper is disclosed. The paper is comprised of a support base having provided thereon, an almost colorless electron donating dye, an organic acid capable of coloration upon contacting the dye and a phenolic compound. The phenolic compound is represented by the general formula (I): ##STR1## wherein R.sub.1 is a branched alkyl group having 3 to 8 carbon atoms, R.sub.2 is a hydrogen atom or a branched alkyl group having 3 to 8 carbon atoms and R.sub.3 is a hydrogen atom or a methyl group. The paper is capable of producing clear images without fogging and the images produced undergo a reduced amount of fading due to the influence of humidity or heat.

Heat-sensitive recording paper

A heat-sensitive recording paper is disclosed. The paper is comprised of a support base having a heat-sensitive color forming layer coated thereon. The color forming layer contains color forming components comprising an almost colorless electron donating dye and an organic acid capable of forming color when contacted with the dye. The color forming layer is coated with a coating layer containing polyvinyl alcohol and boric acid. Due to the existence of the coating layer the recording paper has substantial resistance to decrease the recording density and occur the fog by various chemicals and oils.

A heat-sensitive recording paper is disclosed. The paper is comprised of a support base, a nearly colorless electron donating dye contained in a dispersion on the base, an organic acid capable of producing a color upon contact with the dye, the organic acid contained in a dispersion on the base, and a phenol compound contained in a dispersion on the base, the phenol compound being represented by the general formula (I) defined within the application. By including the particularly disclosed phenol compound within the heat-sensitive recording paper it is possible to obtain a color image which does not fade when stored even in adverse conditions. Furthermore, the inclusion of the phenol compound does not increase fogging.

Heat sensitive recording paper

A recording material is described comprising a base and a developer composition comprising (1) a phenolic compound selected from a bisphenol compound and a phenolic resin, (2) acid-treated activated clay, and (3) a polyalkylene oxide compound applied to said base.

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Shizuoka, Japan

Shojiro Watanabe