Fuji Photo Film Company, Limited

Katsumi Matsuoka

Ken Iwakura

Masanobu Takashima

Keiso Saeki

Shojiro Sano

Masato Satomura

Takeshi Mikami

Kensuke Ikeda

Koreshige Ito

A recording medium comprising at least one electron donating colorless dye and at least one electron accepting compound, wherein the electron accepting compound is a salicylic acid compound represented by formula (I): ##STR1## wherein R represents a divalent group; X and Y, which may be the same or different, each represents a hydrogen aotm, an alkyl group, an aryl group, an alkoxy group, or a halogen atom; and Z represents a hydrogen atom, a carboxyl group, an alkyl group, an aryl group, an alkoxy group, or a halogen atom, or a metal salt thereof.

Recording material

A recording material comprising a support, a microcapsule containing a substantially colorless electron-donating color former and a solvent, and an electron-accepting developer, wherein the color former is at least one selected from p-substituted aminophenylindolylphthalide derivatives, p-substituted aminophenylindolylazaphthalide derivatives and p-substituted aminophenylindolyldiazaphthalide derivatives, the solvent is a paraffin oil, and the amount of the solvent is at least 20% by weight based on the weight of the core substance.

A recording material comprising a support provided thereon a color developer and microcapsules containing a substantially colorless color former is disclosed, wherein the microcapsules further contains at least one of nickel compounds represented by formulae (I) and (II) shown in the specification. The microcapsules exhibit excellent light-resistance, and a color image developed exhibits excellent light-fastness.

A heat-sensitive recording material which produces a developed color image with improved light fastness upon application of thermal energy comprising:

Heat-sensitive recording material

A color developer sheet which brings about color development by contact with a substantially colorless electron-donating color former, where said sheet contains an organometallic compound represented by the following general formula (I), (II) or (III) to enhance light resistance and stability of the color product obtained by the color development: ##STR1## wherein M represents a nickel atom, a copper atom, a cobalt atom, or a zinc atom; X.sub.1 and X.sub.2 each represents an oxygen atom, a sulfur atom, or --NR.sub.5 --, in which R.sub.5 represents a hydrogen atom, an alkyl group, an aryl group, or a hydroxyl group; X.sub.3 represents a hydroxyl group, or a mercapto group; Y represents an oxygen atom, a sulfur atom, or --CHR.sub.6, in which R.sub.6 represents a hydrogen atom, an alkyl group, or an aryl group; R.sub.1, R.sub.2, R.sub.3 and R.sub.4 each represents a hydrogen atom, a halogen atom, a cyano group, or an alkyl, aryl, cycloalkyl or heterocyclyl group attached to the carbon atom directly or via a divalent linkage group, or at least either combination of R.sub.1 and R.sub.2 and/or R.sub.3 and R.sub.4 may be connected to each other to form a 5- or 6-membered ring together with the carbon atoms; and Z represents an organic ligand which forms a complex by binding to M via its hetero atom.

Color developer sheet

A recording material comprising an electron-donating colorless dye and an electron-accepting compound, wherein said colorless dye is a dimer of a 3-(4-substituted aminoaryl)-3-(substituted indol-3-yl)phthalide compound. The recording material provides an image exhibiting satisfactory fastness, and particularly fastness to light even when preserved in a transparent polyvinyl chloride film.

An encapsulated toner for use in electrostatography which comprises a shell and a core material comprising a colorant, a binder and a surface active polymer containing at least 5 mol % of a unit having the formula (I): ##STR1## wherein R is an aliphatic hydrocarbon group having 4 to 22 carbon atoms, A is a divalent aliphatic group having 1 to 50 carbon atoms, B is --O-- or NH--, M is a cation or a cationic radical capable of forming a salt with a sulfonic acid, and m and n are independently 0 or 1. A process for preparing the encapsulated toner which comprises forming a shell around a core material comprising a colorant and a binder in an aqueous medium, characterized in that said core material contains a surface active polymer containing at least 5 mol % of a unit having the above formula (I).

Growing community of inventors

Shizuoka, Japan

Katsumi Matsuoka