Fuji Photo Film Company, Limited

Hiroshi Kamikawa

Sadao Ishige

Takekatsu Sugiyama

Keiichi Tateishi

Toshimasa Usami

Katsuhiko Watanabe

Masato Satomura

Masayuki Iwasaki

Toshiharu Tanaka

Naoto Yanagihara

Mitsuyuki Tsurumi

Takayuki Hayashi

Tetunori Matushita

Hiroshi Satoh

Kimiatus Nomura

The present invention provides a heat-sensitive recording material comprising a substrate; and at least two heat-sensitive recording layers provided on the substrate, the heat-sensitive recording layers including microcapsules encapsulating an electron-donating dye precursor, and an electron-accepting compound, which reacts with the electron-donating dye precursor to develop a color and is disposed outside of the microcapsules, wherein the microcapsules include at least two kinds of microcapsules having different glass transition temperatures. A difference between each of the glass transition temperatures of the at least two microcapsules having different glass transition temperatures is preferably in a range from 20&#xb0; C. to 70&#xb0; C. According to the invention, a heat-sensitive recording material, which is superior in the reproduction of the gradation of an image and enables recording at high density, is obtained.

Heat-sensitive recording material

The present invention provides a heat-sensitive recording material including a support having disposed thereon a heat-sensitive recording layer containing microcapsules in which an electron-donating dye precursor is encapsulated and outside which an electron-accepting compound is present, the electron-donating dye precursor being capable of reacting with the electron-accepting compound to develop color, wherein the microcapsules include at least two kinds of microcapsules having mutually different volume average particle diameters or different glass transition temperatures. A difference between each of the glass transition temperatures of the at least two microcapsules having different glass transition temperatures is preferably in a range from 20&#xb0; C. to 70&#xb0; C. According to the invention, a heat-sensitive recording material, which is superior in the reproduction of the gradation of an image and enables recording at high density, is obtained.

The invention is directed to a process for producing microcapsules containing a diazonium salt compound by the steps of (i) adding a dialkyl sulfate compound represented by the formula: RO--SO.sub.2 --OR, where R is an alkyl or cycloalkyl group having up to 24 carbon atoms, to an organic solvent solution containing a diazonium salt compound and a polyfunctional isocyanate compound, (ii) emulsifying the resulting organic solvent solution into an aqueous solution of ,a water-soluble polymer, and then (iii) polymerizing the polyfunctional isocyanate compound to form microcapsule walls. The invention also discloses the recording material produced by the process.

Process for producing microcapsule containing diazonium salt compound

A diazo heat-sensitive recording material containing a support having provided thereon a recording layer containing a diazo compound, a coupler, and an organic base, wherein the diazo compound is a compound represented by formula (I): ##STR1## wherein R.sub.1 represents --C(Z.sub.1)(Z.sub.2)--CH.sub.2 --A, --CH.sub.2 --C(Z.sub.1)(Z.sub.2)--A or --{C(Z.sub.1)(Z.sub.2)}.sub.m --A,

Diazo heat-sensitive recording material

A multi-color heat-sensitive recording material is disclosed which comprises a support having laminated thereon in the following order a first heat-sensitive color forming layer comprising mainly an electron donating dye precursor and an electron accepting compound, a second heat-sensitive color forming layer containing a diazonium salt compound having a maximum absorption wavelength of 360.+-.20 nm and a coupler capable of reacting with the diazonium salt compound by heating to form color and a third heat-sensitive color forming layer containing a diazonium salt compound represented by formula (I) having a maximum absorption wavelength of 400.+-.20 nm and a coupler represented by formula (II) capable of reacting with the diazonium salt compound by heating to form color: ##STR1## wherein R.sub.1 and R.sub.2 each represents an alkyl group, an aralkyl group or an aryl group; Y represents a halogen atom, an acyl group, an alkoxycarbonyl group or a sulfamoyl group; and X.sub.1.sup.- represents a counter anion: ##STR2## wherein R.sub.3 represents an alkyl group or an aryl group; R.sub.4 represents an alkyl group, an aryl group or an aralkyl group; R.sub.5 represents an alkyl group, an alkoxy group, an aryloxy group, an aralkyloxy group, an alkylthio group, an arylthio group, an aralkylthio group or a halogen atom; and n represents 0 or an integer of 1 to 4.

Multi-color heat-sensitive recording material utilizing multiple

A light- and heat-sensitive recording material is disclosed which includes a support having thereon a recording layer containing a diazo compound, a coupling component, and an organic base compound, wherein the diazo compound is a 1-substituted amino-3-alkoxybenzene-4-diazonium salt and the coupling component is a compound prepared from any of cyclohexane-1,3-dione, 3-cyclohexenone, or 2-cyclohexenone. The light- and heat-sensitive recording material according to the present invention can develop an excellent magenta color hue and has excellent storage properties before recording use (shelf life).

Light- and heat-sensitive recording material

A heat-sensitive recording material comprising a support having provided thereon a heat-sensitive recording layer which comprises (a) a diazo compound, (b) a coupling component which forms a coloration by coupling with the diazo compound, and (c) a basic substance having a structural unit represented by Formula (I): ##STR1##

Heat-sensitive recording materials

A heat-sensitive recording material is disclosed, which comprises a support having thereon a heat-sensitive recording layer comprising a diazo compound and a coupler precursor compound, said coupler precursor compound being capable of forming a compound having an ability of coupling with said diazo compound upon heating.

Heat-sensitive recording material with diazonium salt and coupler

A heat-sensitive recording material comprising a support having provided thereon a heat-sensitive layer containing microcapsules containing at least one diazonium salt capable of azo-coupling with 2-hydroxy-3-naphthoic acid anilide to develop a blue color, a 2-hydroxy-3-naphthoic acid amide derivative, a benzoylacetic amide derivative represented by the following formula and a basic substance: ##STR1## wherein X represents a hydrogen atom, a halogen atom, a lower alkyl group or an alkoxy, aralkyloxy, phenoxy or acylamino group having up to 18 carbon atoms; Y represents an alkyl or aralkyl group having from 7 to 18 carbon atoms, an alkoxy, aralkyloxy, phenoxy, naphthyloxy, alkylthio, aralkylthio or phenylthio group having from 6 to 18 carbon atoms, a naphthylthio group, a sulfonyloxy group, a sulfamoyl gorup, a ureido group, a thioureido group or an acylamino group; X' and Y' each represents a hydrogen atom, a halogen atom, a lower alkyl group or a lower alkoxy group; and Y and Y' may combine to form a substituted or unsubstituted benzene ring. The material has excellent preservability before heat recording, provides a high color density upon heat recording, and develops a black color fixable with light.

Black color heat-sensitive diazo microcapsule recording material with

A heat-sensitive recording material is described, comprising a support having provided thereon a recording layer comprising a diazo compound and a coupling component, wherein the improvement comprises including said diazo compound and at least one compound selected from a polymerizable compound containing an ethylenically unsaturated bond therein or at least one compound capable of releasing a free radical upon exposure to light together in microcapsules.

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Shizuoka, Japan

Hiroshi Kamikawa