JPH07266713A - Medium for reversible thermal recording projection image - Google Patents

Abstract

PURPOSE:To obtain an image by bringing a printing recording part to a transparent state and widen respective temp. ranges changing the printing recording part to a transparent state and an opaque state in a medium for a reversible thermal recording projection image containing a matrix material and an org. monomeric substance and changed in transparency by heat history. CONSTITUTION:5 pts.wt. of polyvinyl acetal being a matrix material and 3 pts.wt. of melissic acid being an org. monomeric substance are dissolved in 50 pts.wt. of tetrahydrofran. This soln. is applied to a film like support 13 composed, for example, of polyethylene and the coating film is dried to form a reversible thermal recording layer 15.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sheet-like medium which can be repeatedly recorded and erased by a thermal means, such as a recording sheet for an overhead projector (hereinafter also referred to as an OHP sheet) or a slide. The present invention relates to a reversible thermosensitive recording projection image medium which is suitable for use as a sheet for printing.

[0002]

2. Description of the Related Art For example, in JP-A-64-14078, a layer containing a vinyl chloride resin as a matrix material and a higher fatty acid as an organic low molecular weight substance is provided on a transparent sheet-like support. Disclosed is a reversible thermosensitive recording projection image medium. Specifically, on a polyester film as a support, a layer composed of vinyl chloride-vinyl acetate copolymer as a matrix material and behenic acid and stearyl stearate as an organic low molecular weight substance is provided. An example of an OHP sheet is disclosed. This publication also shows some examples of media in which the matrix material remains the vinyl chloride-vinyl acetate copolymer and the organic low molecular weight substances are various other than the above examples.

In the reversible thermosensitive recording projection image medium disclosed in this publication, the heated portion becomes opaque (white turbid state) by selectively heating the medium, so that an image can be obtained on the medium. To be Further, when the medium on which the opaque state is selectively formed is projected by the OHP, a dark color image corresponding to the opaque state is formed on the projection surface. Further, this medium is heated to a predetermined temperature range of T _{1 to} T ₂ at 65 ° C. or higher (specifically, a predetermined range of T _{1 to} T ₂ in the range of 65 to 80 ° C.) and then cooled to room temperature. Then, the opaque portion could be made transparent, and the image could be erased.

[0004]

However, the conventional reversible thermosensitive recording projection image medium is such that the heated portion becomes opaque, that is, the background portion becomes the light transmitting portion, so that the transmitted light amount is almost the same. There are many projected images. Therefore, the eyes of the viewer are easily tired. Also, since the temperature at which the opaque part can be returned to transparent is about 65 ° C,
When this conventional medium is used in a projection device that uses a light source that generates a lot of heat, there is a high risk that the opaque portion will become transparent due to the heat from the light source during use and the visibility of the display portion will decrease.

Further, the above predetermined temperature range in which the opaque portion formed by selective heating can be returned to transparent is 8
Since it is as narrow as -15 ° C, it is difficult to control the temperature when erasing an image.

[0006]

Therefore, according to the present invention,
In a reversible thermosensitive recording projection image medium having a reversible thermosensitive recording layer containing a matrix material and an organic low molecular weight substance on a transparent sheet-like support, polyvinyl acetal is used as a matrix material. And

In carrying out the present invention, the organic low molecular weight substance is a monocarboxylic acid having at least 10 carbon atoms, a dicarboxylic acid having at least 10 carbon atoms, or a derivative of monocarboxylic acid having at least 10 carbon atoms. And one or more selected from derivatives of dicarboxylic acids having at least 10 carbon atoms (hereinafter, also referred to as “selected from a predetermined carboxylic acid group”).

Here, (A). At least 10 carbon atoms
The monocarboxylic acid that is, but not limited to, capric acid, undecanoic acid, lauric acid, tridecanoic acid, myristic acid, pentadecanoic acid, palmitic acid,
Heptadecanoic acid, stearic acid, nonadecanoic acid, arachidic acid, heneicosanoic acid, behenic acid, tricosanoic acid, lignoceric acid, pentacosanoic acid, cerotic acid, heptacosanoic acid, octacosanoic acid, nonacosanoic acid, triacontanoic acid, hentriacontanoic acid, dotria Contanoic acid, tritriacontanoic acid, tetratriacontanoic acid, pentatriacontanoic acid, hexatriacontanoic acid, heptatriacontanoic acid, nonatriacontanoic acid, tetracontanoic acid, henetetracontanoic acid, dotetracontanoic acid, tritetracontane Acid, tetratetracontanoic acid, pentatetracontanoic acid, hexatetracontanoic acid, heptatetracontanoic acid, octatetracontanoic acid, nonatetracontanoic acid, pentacontanoic acid, hempentacontanoic acid, dopentacontane Acid, tripentacontanoic acid, tetrapentacontanoic acid, pentapentacontanoic acid, hexapentacontanoic acid, heptapentacontanoic acid, octapentacontanoic acid, nonapentacontanoic acid, hexacontanoic acid, dohexacontanoic acid, decenoic acid, undecene acid,
Dodecenoic acid, tridecenoic acid, tetradecenoic acid, pentadecenoic acid, hexadecenoic acid, heptadecenoic acid, octadecenoic acid, nonadecenoic acid, eicosenoic acid, heneicosenoic acid, docosenoic acid, tricosenoic acid, tetracosenoic acid, pentacosenoic acid, hexacosenoic acid, heptacosenoic acid, octacosenoic acid Examples thereof include monocarboxylic acids selected from nonacosenoic acid and the like.

(B). The dicarboxylic acid having at least 10 carbon atoms is not limited to the following,
Decanedioic acid, undecanedioic acid, dodecanedioic acid, tridecanedioic acid, tetradecanedioic acid, pentadecanedioic acid, hexadecanedioic acid, heptadecanedioic acid, octadecanedioic acid, nonadecanedioic acid, eicosanedioic acid, heneicosanoic acid,
Docosanedioic acid, tricosanedioic acid, tetracosanedioic acid, pentacosanedioic acid, hexacosanedioic acid, heptacosanedioic acid, octacosanedioic acid, nonacosanedioic acid, triacontanedioic acid, gentriacontanedioic acid, dotriacontanedioic acid, tris Triacontanedioic acid, tetratriacontanedioic acid, pentatriacontanedioic acid, hexatriacontanedioic acid, heptatriacontanedioic acid, nonatriacontanedioic acid, tetracontanedioic acid, henetetracontanedioic acid,
Dotetracontanedioic acid, tritetracontanedioic acid, tetratetracontanedioic acid, pentatetracontanedioic acid, hexatetracontanedioic acid, heptatetracontanedioic acid,
Octatetracontanedioic acid, nonatetracontanedioic acid,
Pentacontanedioic acid, hempentacontanedioic acid, dopentacontanedioic acid, tripentacontanedioic acid, tetrapentacontanedioic acid, pentapentacontanedioic acid, hexapentacontanedioic acid, heptapentacontanedioic acid, octapentacontanedioic acid Diacid, nonapentacontanedioic acid, hexacontanedioic acid, dohexacontanedioic acid, decenedioic acid, undecenedioic acid, dodecenedioic acid, tridecenedioic acid, tetradecenedioic acid, pentadecenedioic acid, hexadecenedioic acid, heptadecenedioic acid Acid, octadecenedioic acid, nonadecenedioic acid,
Eicosendioic acid, heneicosenedioic acid, docosenedioic acid,
Examples thereof include dicarboxylic acids selected from tricosenedioic acid, tetracosenedioic acid, pentacosenedioic acid, hexacosenedioic acid and the like.

(C). In addition, the derivative of monocarboxylic acid having at least 10 carbon atoms is not limited to the following, but (C-1). Decanoic acid amide, undecanoic acid amide, dodecanoic acid amide, tridecanoic acid amide, tetradecanoic acid amide, pentadecanoic acid amide, hexadecanoic acid amide, heptadecanoic acid amide, octadecanoic acid amide, nonadecanoic acid amide, eicosanoic acid amide, heneicosanoic acid amide, docosanoic acid Amide, tricosanoic acid amide, tetracosanoic acid amide, pentacosanoic acid amide,
Hexacosanoic acid amide, heptacosanoic acid amide, octacosanoic acid amide, nonacosanoic acid amide, triacontanic acid amide, hentriacontanic acid amide, dotriacontanoic acid amide, tritriacontanoic acid amide, tetratriacontanoic acid amide, pentatriacontanoic acid amide , Hexatriacontanoic acid amide, heptatriacontanoic acid amide, nonatriacontanoic acid amide, tetracontanoic acid amide, hentetracontanoic acid amide, dotetracontanoic acid amide, tritetracontanoic acid amide, tetratetracontanic acid amide, pentatetra Contanic acid amide, hexatetracontanic acid amide, heptatetracontanic acid amide, octatetracontanic acid amide, nonatetracontanic acid amide, pentacontanic acid amide,
Hempentacontanic acid amide, dopentacontanic acid amide, tripentacontanic acid amide, tetrapentacontanic acid amide, pentapentacontanic acid amide, hexapentacontanic acid amide, heptapentacontanic acid amide, octapentacontanic acid amide, nonapentacone Tannic acid amide, hexacontanic acid amide, dohexacontanic acid amide, decenoic acid amide, undecenoic acid amide, dodecenoic acid amide, tridecenoic acid amide, tetradecenoic acid amide, pentadecenoic acid amide, hexadecenoic acid amide, heptadecenoic acid amide, octadecenoic acid amide , Nonadecenoic acid amide, eicosenoic acid amide, heneicosenoic acid amide, docosenoic acid amide, tricosenoic acid amide,
Amides such as tetracosenoic acid amide, pentacosenoic acid amide, hexacosenoic acid amide, heptacosenoic acid amide, octacosenoic acid amide, and nonacosenoic acid amide, (C-2). Amine decanoate, amine undecanoate, amine dodecanoate, amine tridecanoate, amine tetradecanoate, amine pentadecanoate, amine hexadecanoate, amine heptadecanoate, amine octadecanoate, amine nonadecanoate, amine eicosanoate, amine heneicosanoate, docosanoic acid Amine, amine tricosanoate, amine tetracosanoate, amine pentacosanoate, amine hexacosanoate, amine heptacosanoate, amine octacosanoate, amine nonacosanoate, amine triacontanate, amine hentriacontanoate, amine dotriacontanoate, tritriacontane Acid amine, tetratriacontanoic acid amine, pentatriacontanoic acid amine, hexatriacontanoic acid amine, heptatriacontanoic acid amine, nonatriacontanoic acid amine , Tetorakontan acid amine, Heng tetra proximal acid amine, Dotetorakontan acid amine,
Amine tritetracontanoate, amine tetratetracontanoate, amine pentatetracontanoate, amine hexatetracontanoate, amine heptatetracontanoate, amine octatetracontanoate, amine nonatetracontanoate, amine pentacontaneate, hempentacontane Acid amine, dopentacontanoic acid amine, tripentacontanoic acid amine, tetrapentacontanoic acid amine, pentapentacontanoic acid amine, hexapentacontanoic acid amine, heptapentacontanoic acid amine, octapentacontanoic acid amine, nonapentacontanoic acid amine Amine, hexacontanate amine, dodecacontanoate amine, decenoic acid amine, undecenoic acid amine, dodecenoic acid amine, tridecenoic acid amine, tetradecenoic acid amine, pentadecenoic acid amine, hexadecane Phosphate amine, heptadecenoic acid amine, octadecenoic acid amines, nonadecenoic acid amine, eicosenoic acid amine, heneicosene acid amine, docosenoic acid amine, tricosenoic acid amine, tetracosenoic acid amine,
Amines such as amine pentacosenoate, amine hexacosenoate, amine heptacosenoate, amine octacosenoate, amine nonacosenoate, (C-3). Decanoic acid anilide, undecanoic acid anilide, dodecanoic acid anilide, tridecanoic acid anilide, tetradecanoic acid anilide, pentadecanoic acid anilide, hexadecanoic acid anilide, heptadecanoic acid anilide, octadecanoic acid anilide, nonadecanoic acid anilide,
Anilide eicosanoic acid, anilide heneicosanoic acid, anilide docosanoic acid, anilide tricosanoic acid, anilide tetracosanoic acid, anilide pentacosanoic acid, anilide hexacosanoic acid, anilide octaoctanoic acid, anilide nonacosanoic acid, anilide triacanthate, anitriacontanic acid , Dotriacontanoic acid anilide, tritriacontanoic acid anilide, tetratriacontanoic acid anilide, pentatriacontanoic acid anilide, hexatriacontanoic acid anilide, heptatriacontanoic acid anilide, nonatriacontanoic acid anilide, tetracontanoic acid anilide, hentetra Contanic acid anilide, dotetracontanic acid anilide, tritetracontanic acid anilide, tetratetracontanic acid anilide,
Pentatetracontanic acid anilide, Hexatetracontanic acid anilide, Heptatetracontanic acid anilide, Octatetracontanic acid anilide, Nonatetracontanic acid anilide, Pentacontanic acid anilide, Hempentacontanic acid anilide, Dopentacontanic acid anilide, Tripentacontane Acid anilide, tetrapentacontanic acid anilide, pentapentacontanic acid anilide, hexapentacontanic acid anilide, heptapentacontanic acid anilide,
Octapentacontanoic acid anilide, nonapentacontanoic acid anilide, hexacontanic acid anilide, dohexacontanic acid anilide, decenoic acid anilide, undecenoic acid anilide, dodecenoic acid anilide, tridecenoic acid anilide, tetradecenoic acid anilide, pentadecenoic acid anilide, hexadecenoic acid anilide , Heptadecenoic acid anilide, octadecenoic acid anilide, nonadecenoic acid anilide, eicosenoic acid anilide, heneicosenoic acid anilide, docosenoic acid anilide, tricosenoic acid anilide, tetracosenoic acid anilide, pentacosenoic acid anilide, hexacosenoic acid anilide, octacocene anilic acid, octacocene anilic acid, octacocene anilic acid, octacocanoic acid, anicolic acid, octacocanoic acid Anilides such as acid anilide, (C-4). Decanol, undecanol, dodecanol, tridecanol, tetradecanol, pentadecanol, hexadecanol, heptadecanol, octadecanol, nonadecanol, eicosanol, heneicosanol, docosanol, tricosanol, tetracosanol, pentacosanol, hexa Cosanol, heptacosanol, octacosanol, nonacosanol, triacontanol, hentriacontanol, dotriacontanol,
Tritriacontanol, Tetratriacontanol,
Pentatriacontanol, hexatriacontanol, heptatriacontanol, nonatriacontanol, tetracontanol, hentetracontanol, dotetracontanol, tritetracontanol, tetratetracontanol, pentatetracontanol, hexatetracon Tanol, heptatetracontanol, octatetracontanol, nonatetracontanol, pentacontanol, hempentacontanol, dopentacontanol, tripentacontanol, tetrapentacontanol, pentapentacontanol, hexapentacontanol, heptapentacontanol, octapentacontanol , Nonapentacontanol, hexacontanol, dohexacontanol, decenol, undecenol, dodece Lumpur, Toridesenoru, tetradecenol, Pentadesenoru, hexadecenol, Heputadesenoru, octadecenol, Nonadesenoru, Eikosenoru, Heng Eiko Se Nord, Dokosenoru, Torikosenoru, tetracosenoylamino Nord, Pentakosenoru,
Alcohols such as hexacocenol, heptacocenol, octacocenol, nonacocenol, (C-5). Decyl octacosanoate, undecyl octacosanoate, dodecyl octacosanoate, tridecyl octacosanoate, tetradecyl octacosanoate, pentadecyl octacosanoate, hexadecyl octacosanoate, heptadecyl octacosanoate, methyl decanoate, methyl undecanoate, methyl dodecanoate, tridecanoate Methyl, methyl tetradecanoate, methyl pentadecanoate,
Methyl hexadecanoate, Methyl heptadecanoate, Methyl octadecanoate, Methyl nonadecanoate, Methyl eicosanoate, Methyl heneicosanoate, Methyl docosanoate, Methyl tricosanoate, Methyl tetracosanoate, Methyl pentacosanoate, Methyl hexacosanoate, Methyl heptacosanoate, Octacosanoic acid Methyl, methyl nonacosanoate, methyl triacontanoate, methyl hentriacontanoate,
Methyl dotriacontanate, Methyl tritriacontanate, Methyl tetratriacontanate, Methyl pentatriacontanate, Methyl hexatriacontanate, Methyl heptatriacontanate, Methyl nonatriacontanate, Methyl tetracontanate, Hentetracontane Methyl acid, methyl dotetracontanate, methyl tritetracontanate, methyl tetratetracontanate, methyl pentatetracontanate, methyl hexatetracontanate,
Methyl heptatetracontanate, Methyl octatetracontanate, Methyl nonatetracontanate, Methyl pentacontanate, Methyl hempentacontanate, Methyl dopentacontanate, Methyl tripentacontanate, Methyl tetrapentacontanate, Pentapentacontane Methyl acid, methyl hexapentacontanate, methyl heptapentacontanate, methyl octapentacontanate, methyl nonapentacontanate, methyl hexacontanate, methyl dohexacontanate, methyl decenoate, methyl undecenoate, methyl dodecenoate, Methyl tridecenoate, methyl tetradecenoate, methyl pentadecenoate, methyl hexadecenoate, methyl heptadecenoate, methyl octadecenoate, methyl nonadecenoate, methyl eicosenoate, methyl heneicosenoate , Methyl docosenoate, methyl tricosenoate, methyl tetracosenoate, methyl pentacosenoate, methyl hexacosenoate, methyl heptacosenoate, methyl octacosenoate, methyl nonacosenoate, vinyl decanoate, vinyl undecanoate, vinyl dodecanoate, vinyl tridecanoate, tetradecane Vinyl acetate, vinyl pentadecanoate, vinyl hexadecanoate, vinyl heptadecanoate, vinyl octadecanoate, vinyl nonadecanoate, vinyl eicosanate, vinyl heneicosanate, vinyl docosanoate, vinyl tricosanoate, vinyl tetracosanoate,
Vinyl pentacosanoate, vinyl hexacosanoate, vinyl heptacosanoate, vinyl octacosanoate, vinyl nonacosanoate, vinyl triacontanate, vinyl hentriacontanate, vinyl dotriacontanate, vinyl tritriacontanate, vinyl tetratriacontanate, penta Vinyl triacontanate, vinyl hexatriacontanate, vinyl heptatriacontanate, vinyl nonatriacontanoate, vinyl tetracontanate, vinyl henetetracontanate, vinyl detetracontanate, vinyl tritetracontanate, tetratetracontanate Vinyl, vinyl pentatetracontanate, vinyl hexatetracontanate, vinyl heptatetracontanate, vinyl octatetracontanate, vinyl nonatetracontanate, vinyl pentacontanate , Vinyl hempentacontanate, vinyl dopentacontanate, vinyl tripentacontanate, vinyl tetrapentacontanate, vinyl pentapentacontanate, vinyl hexapentacontanate, vinyl heptapentacontanate, vinyl octapentacontanate, nona Vinyl pentacontanate, vinyl hexacontanate, vinyl dohexacontanate, vinyl decenoate, vinyl undecenoate, vinyl dodecenoate, vinyl tridecenoate, vinyl tetradecenoate, vinyl pentadecenoate,
Vinyl hexadecenoate, vinyl heptadecenoate, vinyl octadecenoate, vinyl nonadecenoate, vinyl eicosenoate, vinyl heneicosenoate, vinyl docosenoate, vinyl tricosenoate, vinyl tetracosenoate, vinyl pentacosenoate, vinyl hexacosenoate, vinyl heptacenoate, octacosenoate. Vinyl, vinyl nonacosenoate, phenyl decanoate, phenyl undecanoate, phenyl dodecanoate, phenyl tridecanoate, phenyl tetradecanoate, phenyl pentadecanoate, phenyl hexadecanoate, phenyl heptadecanoate, phenyl octadecanoate, phenyl nonadecanoate, phenyl eicosanoate, Phenyl heicosanoate, phenyl docosanoate, phenyl tricosanoate, phenyl tetracosanoate, phenyl pentacosanoate, hexa Phenyl sanate, phenyl heptacosanoate, phenyl octacosanoate, phenyl nonacosanoate, phenyl triacontanoate, phenyl hentriacontanate, phenyl dotriacontanoate, phenyl tritriacontanoate, phenyl tetratriacontanoate, phenyl pentatriacontanoate , Phenyl hexatriacontanoate, phenyl heptatriacontanoate,
Phenyl nonatriacontanoate, phenyl tetracontanoate, phenyl henetetracontanoate, phenyl dotetracontanoate, phenyl tritetracontanoate, phenyl tetratetracontanoate, phenyl pentatetracontanoate, phenyl hexatetracontanoate, heptatetracontane Phenyl acid, phenyl octatetracontanate, phenyl nonatetracontanate, phenyl pentacontanate, phenyl hempentacontanate, phenyl dopentacontaneate, phenyl tripentacontanate, phenyl tetrapentacontanate, phenyl pentapentacontanate, Phenyl hexapentacontanoate, phenyl heptapentacontanoate, phenyl octapentacontanoate, phenyl nonapentacontanoate, phenyl hexacontanoate, Kisakontan acid phenyl, phenyl-decenoic acid, phenyl undecenoic acid, phenyl dodecenoic acid, phenyl tridecenoic acid, phenyl tetradecenoic acid,
Phenyl pentadecenoate, phenyl hexadecenoate, phenyl heptadecenate, phenyl octadecenoate, phenyl nonadecenoate, phenyl eicosenoate, phenyl heneicosenoate, phenyl docosenoate, phenyl tricosenoate, phenyl tetracosenoate, phenyl pentacosenoate, phenyl hexacosenoate, heptacosenoic acid Esters such as phenyl, phenyl octacosenoate, phenyl nonacosenoate, (C-6). Lauron, stearone, 19-heptatriacontanone, 20-nonatriacontanone,
21-hentetracontanone, a ketone such as 22-tritetracontanone, (C-7). Octadecanoic acid Ca, octadecanoic acid Co, octadecanoic acid Cu, octadecanoic acid F
e, octadecanoic acid K, octadecanoic acid Li, octadecanoic acid Mg, octadecanoic acid Mn, octadecanoic acid N
i, octadecanoic acid Pb, octadecanoic acid Sn, octadecanoic acid Zn, octadecanoic acid Zr, decanoic acid Ca, undecanoic acid Ca, dodecanoic acid Ca, tridecanoic acid Ca,
Ca tetradecanoate, Ca pentadecanoate, Ca hexadecanoate, Ca heptadecanoate, Ca octadecanoate,
Nonadecanoic acid Ca, eicosanoic acid Ca, heneicosanoic acid Ca, docosanoic acid Ca, tricosanoic acid Ca, tetracosanoic acid Ca, pentacosanoic acid Ca, hexacosanoic acid C
a, Ca heptacosanoic acid, Ca octacosanoic acid, Ca nonacosanoic acid, Ca triacontanoic acid, Ca hentriacontanoic acid, Ca dotriacontanoic acid, Ca tritriacontanoic acid, Ca tetratriacontanoic acid, Ca pentatriacontanoic acid, Hexa Ca triacontanoate, Ca heptatriacontanoate, Ca nonatriacontanoic acid, Ca tetracontanoic acid, Ca hentetracontanoic acid, Ca dotetracontanoic acid, Ca tritetracontanoic acid, Ca tetratetracontanoic acid, Pentatetracontanoic acid C
a, Ca hexatetracontanate, Ca heptatetracontaneate, Ca octatetracontaneate, Ca nonatetracontaneate, Ca pentacontaneate, Ca hempentacontaneate, Ca dopentacontaneate, Ca tripentacontaneate, Tetra Ca pentacontanoic acid, Ca pentapentacontanoic acid, Ca hexapentacontanoic acid, Ca heptapentacontanoic acid, Octapentacontanoic acid C
a, Ca nonapentacontanoate, C hexahexanoate
a, Ca dohexacontanoate, Ca decenoate, Ca undecenoate, Ca dodecenoate, Ca tridecenoate, Ca tetradecenoate, Ca pentadecenoate, C hexadecenoate
a, Ca heptadecenoate, Ca octadecenoate, Ca nonadecenoate, Ca eicosenoate, Hene eicosenoate C
a, Ca docosenoate, Ca tricosenoate, Ca tetracosenoate, Ca pentacosenoate, Ca hexacosenoate, Ca heptacosenoate, Ca octacosenoate, Ca nonacosenoate, etc., (C-8). Decyl imidazole, undecyl imidazole, dodecyl imidazole, tridecyl imidazole, tetradecyl imidazole, pentadecyl imidazole, hexadecyl imidazole, heptadecyl imidazole, octadecyl imidazole, nonadecyl imidazole, eicosyl imidazole, hene eicosyl imidazole, imidazole imidazole, imidazole imidazole, imidazole imidazole Examples thereof include derivatives of a monocarboxylic acid selected from imidazoles such as tricosylimidazole, tetracosylimidazole, pentacosylimidazole and hexacosylimidazole.

(D). Derivatives of dicarboxylic acids having at least 10 carbon atoms include, but are not limited to, (D-1) .decanedioic acid amide, undecanedioic acid amide, dodecanedioic acid amide, tridecanedioic acid amide. , Tetradecanedioic acid amide, pentadecanedioic acid amide, hexadecanedioic acid amide, heptadecanedioic acid amide, octadecanedioic acid amide, nonadecanedioic acid amide, eicosanedioic acid amide, heneicosanedioic acid amide, docosanedioic acid amide, tricosanedioic acid amide , Tetracosane diacid amide, pentacosane diacid amide, hexacosane diacid amide, heptacosane diacid amide, octacosane diacid amide, nonacosane diacid amide, triacontanedioic acid amide, hentriacontanedioic acid amide, dotriacontane diacid amide , Tritriacontanedioic acid amide, tet Triacontanoic diacid amide, pentatriacontanoic proximal diacid amide, hexatriacontane diacid amide, hepta triacontyl Tan diacid amide, nona triacontyl Tan diacid amide,
Tetracontanedioic acid amide, Hentetracontanedioic acid amide, Dotetracontanedioic acid amide, Tritetracontanedioic acid amide, Tetratetracontanedioic acid amide, Pentatetracontanedioic acid amide, Hexatetracontanedioic acid amide, Heptatetra Contanedioic acid amide, octatetracontanedioic acid amide, nonatetracontanedioic acid amide, pentacontanedioic acid amide, hempentacontanedioic acid amide, dopentacontanedioic acid amide, tripentacontanedioic acid amide, tetrapentacontanedioic acid amide Acid amide,
Pentapentacontanedioic acid amide, hexapentacontanedioic acid amide, heptapentacontanedioic acid amide, octapentacontanedioic acid amide, nonapentacontanedioic acid amide, hexacontanedioic acid amide, dohexacontanedioic acid amide, decene diamide Acid amide, undecenedioic acid amide, dodecenedioic acid amide, tridecenedioic acid amide, tetradecenedioic acid amide, pentadecenedioic acid amide, hexadecenedioic acid amide, heptadecenedioic acid amide, octadecenedioic acid amide, nonadecenedioic acid amide, eicosenedioic acid amide Acid amide, heneicosendioic acid amide, docosenedioic acid amide, tricosenedioic acid amide, tetracosenedioic acid amide, pentacosenedioic acid amide, hexacosenedioic acid amide, heptacosenedioic acid amide, octacosenedioic acid amide, nonacosenedioic acid amide Amide, (D-2). Decanoic diacid amine, undecanoic diacid amine, dodecanedioic acid amine, tridecanedioic acid amine, tetradecanedioic acid amine,
Pentadecanedioic acid amine, hexadecanedioic acid amine, heptadecanedioic acid amine, octadecanedioic acid amine, nonadecanedioic acid amine, eicosane diacid amine, hene eicosane diacid amine, docosane diacid amine, tricosane diacid amine, tetracosane diacid amine, Pentacosane diacid amine, hexacosane diacid amine, heptacosane diacid amine, octacosane diacid amine, nonacosan diacid amine,
Triacontanedioic acid amine, Hentriacontanedioic acid amine, Dotriacontanedioic acid amine, Tritriacontanedioic acid amine, Tetratriacontanedioic acid amine, Pentatriacontanedioic acid amine, Hexatriacontanedioic acid amine, Heptatria Contanedioic acid amine, Nonatriacontanedioic acid amine, Tetracontanedioic acid amine, Hentetracontanedioic acid amine, Detetracontanedioic acid amine, Tritetracontanedioic acid amine, Tetratetracontanedioic acid amine, Pentatetracontanedioic acid Acid amines,
Hexatetracontanedioic acid amine, heptatetracontanedioic acid amine, octatetracontanedioic acid amine, nonatetracontanedioic acid amine, pentacontanedioic acid amine, hempentacontanedioic acid amine, dopentacontanedioic acid amine, tripentacone Amine tandioate, tetrapentacontanedioate, pentapentacontanedioate, hexapentacontanedioate, heptapentacontanedioate, octapentacontanedioate, nonapentacontanedioate, hexacontanedioate Acid amine, dodecacontanedioic acid amine, decenedioic acid amine, undecenedioic acid amine, dodecenedioic acid amine, tridecenedioic acid amine, tetradecenedioic acid amine, pentadecenedioic acid amine, hexadecenedioic acid amine, heptadecenedioic acid amine, Ok Decenedioic acid amine, nonadecenedioic acid amine, eicosenedioic acid amine, heneicosenedioic acid amine, docosenedioic acid amine, tricosenedioic acid amine, tetracosenedioic acid amine, pentacosenedioic acid amine, hexacosenedioic acid amine, heptacosenedioic acid amine, Amines such as octacocenedioic acid amine and nonacocenedioic acid amine, (D-3) .decanedioic acid anilide, undecanedioic acid anilide, dodecanedioic acid anilide, tridecanedioic acid anilide, tetradecanedioic acid anilide, pentadecanedioic acid anilide, hexadecane Diacid anilide, heptadecanedioic acid anilide, octadecanedioic acid anilide, nonadecanedioic acid anilide, eicosane diacid anilide, heneicosandioic acid anilide, docosanedioic acid anilide, tricosanedioic acid anilide, tetracosanedioic acid anilide, pentacosa Diacid anilide, hexacosane diacid anilide, heptacosane diacid anilide, octacosane diacid anilide, nonacosane diacid anilide, triacontanedioic acid anilide, gentriacontane diacid anilide, dotriacontane diacid anilide, tritriacontane diacid anilide , Tetratriacontanedioic acid anilide, pentatriacontanedioic acid anilide, hexatriacontanedioic acid anilide, heptatriacontanedioic acid anilide, nonatriacontanedioic acid anilide, tetracontanedioic acid anilide, hentetracontanedioic acid anilide, do Tetracontanedioic acid anilide, tritetracontanedioic acid anilide, tetratetracontanedioic acid anilide, pentatetracontanedioic acid anilide, hexatetracontanedioic acid anilide, heptatetracontanedioic acid anilide, o Kutatetracontanedioic acid anilide, nonatetracontanedioic acid anilide, pentacontanedioic acid anilide, hempentacontanedioic acid anilide, dopentacontanedioic acid anilide, tripentacontanedioic acid anilide,
Tetrapentacontanedioic acid anilide, pentapentacontanedioic acid anilide, hexapentacontanedioic acid anilide, heptapentacontanedioic acid anilide, octapentacontanedioic acid anilide, nonapentacontanedioic acid anilide, hexacontanedioic acid anilide, dohexacon Tanidic acid anilide, decenedioic acid anilide, undecenedioic acid anilide, dodecenedioic acid anilide, tridecenedioic acid anilide, tetradecenedioic acid anilide, pentadecenedioic acid anilide, hexadecenedioic acid anilide, heptadecenedioic acid anilide, octadecenedioic acid anilide, Nonadecenedioic acid anilide, eicosenedioic acid anilide, heneicosenedioic acid anilide, docosenedioic acid anilide, tricosenedioic acid anilide, tetracosenedioic acid anilide, pentacosenedioic acid anilide, hexacocene Acid anilide, heptacosenoic diacid anilide, octacosenoic diacid anilide, anilide such nonacosenoic diacid anilide, (D-4). Decanoic diacid alcohol,
Undecanedioic acid alcohol, dodecanedioic acid alcohol,
Tridecanedioic acid alcohol, tetradecanedioic acid alcohol, pentadecanedioic acid alcohol, hexadecanedioic acid alcohol, heptadecanedioic acid alcohol, octadecanedioic acid alcohol, nonadecanedioic acid alcohol, eicosanedioic acid alcohol, heneicosanedioic acid alcohol, docosanedioic acid alcohol, Tricosanedioic acid alcohol, tetracosanedioic acid alcohol, pentacosanedioic acid alcohol, hexacosanedioic acid alcohol, heptacosanedioic acid alcohol, octacosanedioic acid alcohol, nonacosandioic acid alcohol, triacontanedioic acid alcohol, gentriacontanedioic acid alcohol, dotria Contanedioic acid alcohol, tritriacontanedioic acid alcohol, tetratriacontanedioic acid alcohol, pentatriacontanedioic acid alcohol, Oxatriacontanedioic acid alcohol, heptatriacontanedioic acid alcohol, nonatriacontanedioic acid alcohol, tetracontanedioic acid alcohol, hentetracontanedioic acid alcohol, dotetracontanedioic acid alcohol, tritetracontanedioic acid alcohol, tetratetra Contanedioic acid alcohol, pentatetracontanedioic acid alcohol, hexatetracontanedioic acid alcohol, heptatetracontanedioic acid alcohol, octatetracontanedioic acid alcohol, nonatetracontanedioic acid alcohol, pentacontanedioic acid alcohol, hempentacontanedioic acid alcohol Acid alcohol, dopentacontanedioic acid alcohol, tripentacontanedioic acid alcohol, tetrapentacontanedioic acid alcohol, pentapentacontanedioic acid alcohol, hexapentaco Tannedioic acid alcohol, heptapentacontanedioic acid alcohol, octapentacontanedioic acid alcohol, nonapentacontanedioic acid alcohol, hexacontanedioic acid alcohol, dohexacontanedioic acid alcohol, decenedioic acid alcohol, undecenedioic acid alcohol, dodecene Diacid alcohol, tridecenedioic acid alcohol, tetradecenedioic acid alcohol,
Pentadecenedioic acid alcohol, hexadecenedioic acid alcohol, heptadecenedioic acid alcohol, octadecenedioic acid alcohol, nonadecenedioic acid alcohol, eicosenedioic acid alcohol, heneicosenedioic acid alcohol, docosenedioic acid alcohol, tricosenedioic acid alcohol, tetracosenedioic acid alcohol, Pentacosenedioic acid alcohol,
Alcohols such as hexacocenedioic acid alcohol, heptacocenedioic acid alcohol, octacocenedioic acid alcohol, nonacocenedioic acid alcohol, etc., (D-5) .decyl octacosanedioic acid, undecyl octacosanedioic acid, dodecyl octacosanedioic acid, tridecyl octacosanedioic acid, octacosan Tetradecyl diacid, pentadecyl octacosanedioate, hexadecyl octacosanedioate, heptadecyl octacosanedioate, octadecyl octacosanedioate, methyl decanedioate, methyl undecanedioate, methyl dodecanedioate, methyl tridecanedioate, methyl tetradecanedioate, pentadecane Methyl diacid, Methyl hexadecanedioate, Methyl heptadecanedioate, Methyl octadecanedioate, Methyl nonadecanedioate, Methyl eicosane diate, Methyl heneicosane diate, Docosane di Methyl, tricosanoic diacid methyl,
Methyl tetracosanedioate, Methyl pentacosanedioate, Methyl hexacosanedioate, Methyl heptacosanedioate, Methyl octacosanedioate, Methyl nonacosanedioate, Methyl triacontanedioate, Methyl hentriacontanedioate, Methyl dotriacontanedioate, Methyl tritriacontanedioate, methyl tetratriacontanedioate, methyl pentatriacontanedioate, methyl hexatriacontanedioate, methyl heptatriacontanedioate, methyl nonatriacontanedioate, methyl tetracontanedioate, hentetra Methyl contanedioate, Methyl dotetracontanedioate,
Methyl tritetracontanedioate, methyl tetratetracontanedioate, methyl pentatetracontanedioate, methyl hexatetracontanedioate, methyl heptatetracontanedioate, methyl octatetracontanedioate, methyl nonatetracontanedioate, pentacon Methyl tandioate, methyl hempentacontanedioate, methyl dopentacontanedioate, methyl tripentacontanedioate, methyl tetrapentacontanedioate, methyl pentapentacontanedioate, methyl hexapentacontanedioate, heptapentacontane Methyl diacid, Methyl octapentacontanedioate, Methyl nonapentacontanedioate, Methyl hexacontanedioate,
Methyl dodecacontanedioate, methyl decenedioate, methyl undecenedioate, methyl dodecenedioate, methyl tridecenedioate, methyl tetradecenedioate, methyl pentadecenedioate, methyl hexadecenedioate, methyl heptadecenedioate, octadecenedioic acid Methyl, methyl nonadecenedioate, methyl eicosendioate, methyl heneicosendioate, methyl docosenedioate, methyl tricosenedioate, methyl tetracosenedioate, methyl pentacosenedioate, methyl hexacosenedioate, methyl heptacosenedioate, octacosenedioic acid Methyl, methyl nonacosenedioate, vinyl decanedioate, vinyl undecanedioate, vinyl dodecanedioate, vinyl tridecanedioate, vinyl tetradecanedioate, vinyl pentadecanedioate, vinyl hexadecanedioate, vinyl heptadecanedioate, octa Vinyl decanedioate, vinyl nonadecanedioate, vinyl eicosane diate, vinyl heneicosane diate, vinyl docosane diate, vinyl tricosane diate, vinyl tetracosane diate, vinyl pentacosane diate, vinyl hexacosane diate, vinyl heptacosane diate, Octacosan vinyl diacid, nonacosan vinyl diacid,
Vinyl triacontanedioate, vinyl hentriacontanedioate, vinyl dotriacontanedioate, vinyl tritriacontanedioate, vinyl tetratriacontanedioate, vinyl pentatriacontanedioate, vinyl hexatriacontanedioate, heptatria Vinyl contanedioate, vinyl nonatriacontanedioate, vinyl tetracontanedioate, vinyl hentetracontanedioate, vinyl detetracontanedioate, vinyl tritetracontanedioate, vinyl tetratetracontanedioate, pentatetracontanedioate Vinylate,
Vinyl hexatetracontanedioate, vinyl heptatetracontanedioate, vinyl octatetracontanedioate, vinyl nonatetracontanedioate, vinyl pentacontanedioate, vinyl hempentacontanedioate, vinyl dopentacontanedioate, tripentacone Vinyl tandioate, vinyl tetrapentacontanedioate, vinyl pentapentacontanedioate, vinyl hexapentacontanedioate, vinyl heptapentacontanedioate, vinyl octapentacontanedioate, vinyl nonapentacontanedioate, hexacontanediate Vinyl acid vinyl, vinyl dodecacontanedioate, vinyl decenedioic acid, vinyl undecenedioic acid, vinyl dodecenedioic acid, vinyl tridecenedioic acid, vinyl tetradecenedioic acid, vinyl pentadecenedioic acid, vinyl hexadecenedioic acid, vinyl heptadecenedioic acid, Ok Vinyl decenedioate, vinyl nonadecenedioate, vinyl eicosenedioate, vinyl heneicosenedioate, vinyl docosenedioate, vinyl tricosenedioate, vinyl tetracosenedioate, vinyl pentacosenedioate, vinyl hexacosenedioate, vinyl heptacosenedioate, Vinyl octacocenedioate, vinyl nonacocenedioate,
Phenyl decanedioate, phenyl undecanedioate, phenyl dodecanedioate, phenyl tridecanedioate, phenyl tetradecanedioate, phenyl pentadecanedioate, phenyl hexadecanedioate, phenyl heptadecanedioate, phenyl octadecanedioate, phenyl nonadecanedioate, Phenyl eicosanedioate, phenyl heneicosanedioate, phenyl docosanedioate, phenyl tricosanedioate, phenyl tetracosanedioate, phenyl pentacosanedioate, phenyl hexacosanedioate, phenyl heptacosanedioate, phenyl octacosanedioate, phenyl nonacosanedioate, Phenyl triacontanedioate, phenyl hentriacontanedioate, phenyl dotriacontanedioate, phenyl tritriacontanedioate, phenyl tetratriacontanedioate, pentatriaco Phenyl tandioate, phenyl hexatriacontanedioate, phenyl heptatriacontanedioate, phenyl nonatriacontanedioate, phenyl tetracontanedioate, phenyl hentetracontanedioate, phenyl dotetracontanedioate, tritetracontanedioate Phenyl acid, phenyl tetratetracontanedioate, phenyl pentatetracontanedioate, phenyl hexatetracontanedioate, phenyl heptatetracontanedioate, phenyl octatetracontanedioate, phenyl nonatetracontanedioate, phenyl pentacontanedioic acid , Phenyl pentapentacontanedioate, phenyl dopentacontanedioate, phenyl tripentacontanedioate, phenyl tetrapentacontanedioate, phenyl pentapentacontanedioate, phenyl hexapentacontanedioate Phenyl heptapentacontanedioate, phenyl octapentacontanedioate, phenyl nonapentacontanedioate, phenyl hexacontanedioate, phenyl dohexacontanedioate, phenyl decenedioate, phenyl undecenedioate, phenyl dodecenedioate, tridecene Phenyl diacid, phenyl tetradecenedioate, phenyl pentadecenedioate, phenyl hexadecenedioate, phenyl heptadecenedioate, phenyl octadecenedioate, phenyl nonadecenedioate, phenyl eicosendioate, phenyl heneicosendioate, phenyl docosenedioate, tricosene. Esters such as phenyl diacid, phenyl tetracosenedioate, phenyl pentacosenedioic acid, phenyl hexacosenedioic acid, phenyl heptacosenedioic acid, phenyl octacosenedioic acid, and phenyl nonacosenedioic acid, (D-6). Laurone, stearone, 19-heptatriacontanone, 20-nonatriacontanone, 21-hentetracontanone, 22-tritetracontanone and other ketones, (D-7). Octadecanedioic acid Ca Co, octadecanedioate, Cu octadecanedioate, Fe octadecanedioate,
Octadecanedioic acid K, octadecanedioic acid Li, octadecanedioic acid Mg, octadecanedioic acid Mn, octadecanedioic acid Ni, octadecanedioic acid Pb, octadecanedioic acid S
n, octadecanedioic acid Zn, octadecanedioic acid Zr, decanedioic acid Ca, undecanedioic acid Ca, dodecanedioic acid C
a, Ca tridecanedioate, Ca tetradecanedioate, Ca pentadecanedioate, Ca hexadecanedioate, Ca heptadecanedioate, Ca octadecanedioate, C nonadecanedioate
a, Ca eicosane diacid, Ca hen eicosane diacid, Ca docosane diate, Ca tricosane diate, Ca tetracosane diate, Ca pentacosane diate, C hexacosane diate
a, Ca heptacosandioic acid, Ca octacosandioic acid, Ca nonacosandioic acid, Ca triacontanedioic acid, Ca hentriacontanedioic acid, Ca dotriacontanedioic acid, Ca tritriacontanedioic acid, C tetratriacontanedioic acid
a, Ca pentatriacontanedioate, Ca hexahexacontanedioate, Ca heptatriacontanedioate, Ca nonatriacontanedioate, Ca tetracontanedioate, Ca henetetracontanedioate, Ca dotetracontanedioate,
Ca tritetracontanedioate, Ca tetratetracontanedioate, Ca pentatetracontanedioate, Ca hexatetracontanedioate, Ca heptatetracontanedioate, Ca octatetracontanedioate, Ca nonatetracontanedioate, Pentacon Ca tandioate, Ca hempentacontanedioate, Ca dopentacontanedioate, Ca tripentacontanedioate, Ca tetrapentacontanedioate, Ca pentapentacontanedioate, C hexapentacontanedioate
a, Ca heptapentacontanedioate, Ca octapentacontanedioate, Ca nonapentacontanedioate, Ca hexacontanedioate, Ca dohexacontanedioate, Ca decenedioate, Ca undecenedioate, Ca dodecenedioate , Ca tridecenedioate, Ca tetradecenedioate, Ca pentadecenedioate, Ca hexadecenedioate, C heptadecenedioate
a, Ca octadecenedioate, Ca nonadecenedioate, Ca eicosendioate, Ca heneicosenedioate, Ca docosenedioate, Ca tricosenedioate, Ca tetracosenedioate,
Examples thereof include metal salts such as Ca pentacosenedioate, Ca hexacosendioate, Ca heptacosenedioate, Ca octacosenedioate, and Ca nonacosenedioate, or dicarboxylic acid derivatives selected from imidazole and the like.

In carrying out the present invention, the reversible thermosensitive recording medium is such that the mixing ratio of the matrix material and the organic low molecular weight substance is more than 1: 2 in terms of the weight ratio of the organic low molecular weight substance. It becomes difficult to form the film, and if it is less than 20: 1, the thermal reversibility becomes small. Therefore, it is preferable to set it within the range of 1: 2 to 20: 1.

In addition to the inclusion of the matrix material and the organic low-molecular-weight substance as used herein, not only in the case of containing these, but also in addition to these, a substance for improving the film quality of the reversible thermosensitive recording material, a lubricant It is also meant to include other substances such as substances that improve the properties.

In the production of a reversible thermosensitive recording projection image medium, a coating solution containing a matrix material and an organic low molecular weight substance is prepared in order to apply the matrix material and the organic low molecular weight substance to a support. There is. In that case,
It is preferable to dissolve the matrix material and the organic low molecular weight substance in a solvent to obtain a coating solution. The solvent may be, but is not limited to, one selected from tetrahydrofuran, methyl ethyl ketone, methyl isobutyl ketone, chloroform, carbon tetrachloride, ethanol, toluene and benzene, or two kinds. It is better to use a mixture of the above. The coating solution may be heated and used if necessary.

[0015]

In the medium for reversible thermosensitive recording projection images of the present invention (hereinafter, may be abbreviated as "medium"), the portion heated by the heating means becomes the transparent portion and the other portions are in the opaque state (white turbid state). ). This means that a projection image using light transmitted through the heating unit can be formed on the projection surface. According to the present invention, a projected image can be formed in a state in which the amount of transmitted light is small, because the area of the print recording portion is generally smaller than the area of the background portion.

Further, according to the constitution in which an organic low molecular weight substance selected from a predetermined carboxylic acid group is used, the maximum transparency is obtained when the substance is heated to a temperature of T ₂ or higher and then rapidly cooled (for example, 50 ° C./sec or higher). , T ₁ (T ₁ <T ₂ )
In the case of rapid cooling (eg, 50 ° C./sec or more) after heating to T ₂ or less, or gradual cooling (eg, less than 50 ° C./sec) after heating to T ₁ or more It has a heat history-transparency characteristic of exhibiting the minimum transparency. This heat history-transparency characteristic is shown in FIG. In FIG. 2, RT indicates room temperature. Here, in one method for making the transparent state opaque, in the method of heating in the range of T _{1 to} T ₂ and rapidly cooling, the width of T _{1 to} T ₂ can be at least 30 degrees. . As another method for making the transparent state opaque, heating to T ₁ or higher and then gradual cooling (for example, 5
0 ° C./second). The temperature of T _{1 in} these methods is 80 ° C depending on the selection of carboxylic acid.
It can be done easily. From these facts, the medium of the present invention is more relaxed under the condition that the transparent state is changed to the opaque state than before, and the transparent state is stable up to a higher temperature than before.

[0017]

Embodiments of the present invention will be described below with reference to the drawings. It should be noted that the drawings used for the description are only schematically shown so that the present invention can be understood. Further, it is understood that the materials and numerical conditions used in the following examples are merely examples within the scope of the present invention, and therefore the present invention is not limited to these materials and numerical conditions. I want to.

1-1. Embodiment 1 FIGS. 1 to 3 are diagrams for explaining a reversible thermosensitive recording projection image medium 11 according to Embodiment 1 of the present invention. In particular, FIG. 1 is a sectional view for explaining the main part of the medium 11, and FIG.
FIG. 3 is a diagram showing the characteristics of the change in transparency with respect to the thermal history of the reversible thermosensitive recording layer 21 (see FIG. 1) included in this medium 11, and FIG. 3 is a diagram for explaining the image formed on this medium. It should be noted that in FIG. 1, the arrow with the character "record" means the direction of heating by the heating means, the arrow with the character "light" means the traveling direction of the light from the light source of the OHP, and the "screen". The arrow with the character "" means a certain direction of the projection surface.

The medium 11 of Example 1 is a reversible thermosensitive material containing polyvinyl acetal as a matrix material and a predetermined organic low-molecular substance (details will be described later) on a transparent sheet-like support 13. Recording layer 15 and protective layer 17
It is configured to include. Although the protective layer 17 is not essential, it is preferable to provide the reversible thermosensitive recording layer 15 in order to protect it from friction and the like.

Here, the thickness of the support 13 may be a thickness that can maintain the reversible thermosensitive recording layer 15 and a thickness suitable as a medium for projection image, but is not limited to this, for example, 25 μm. It can be ~ 1 mm. Also, the support 1
The constituent material of 3 is not particularly limited as long as it is suitable for the purpose. For example, polyester, polyethylene, polypropylene, cellophane, polyvinyl chloride, polyolefin, polyvinyl alcohol, polyvinylidene chloride,
Plastics such as polystyrene, polyamide, polycarbonate, polyarylate, polysulfone, fluororesin, polyacrylonitrile, polyether sulfane, polybutadiene, and polyimide are mentioned as the constituent material of the support 13. Further, a plastic in which carbon powder or metal powder is dispersed can also be used as a constituent material of the support 13. In this embodiment, the support 13 is made of a polyester film having a thickness of 200 μm.

The constituent material of the protective layer 17 is not particularly limited as long as it is transparent and suitable for the purpose of the protective layer. For example, polyester, polyethylene,
Polypropylene, cellophane, polyvinyl chloride, polyolefin, polyvinyl alcohol, polyvinylidene chloride, polystyrene, polyamide, polycarbonate, polyarylate, polysulfone, fluororesin, polyacrylonitrile, polyether sulfane, polybutadiene, polyimide, UV (UV) curing type A plastic such as a resin may be mentioned as a constituent material of the protective layer 17.
The thickness of the protective layer 17 can be arbitrarily set within a range that does not impair the heat of the heating means (for example, a thermal head) reaching the reversible heat-sensitive layer 15 and a range in which the function as the protective layer is obtained,
For example, 1 to 15 μm is preferable.

Next, the reversible thermosensitive recording layer 13 is constructed in the first embodiment as described below. That is, polyvinyl acetal (S-REC KS-1 (trade name) manufactured by Sekisui Chemical Co., Ltd.) is prepared as a matrix material.
As an organic low molecular weight substance, melissic acid (having 30 carbon atoms), which is one kind of monocarboxylic acid having at least 10 carbon atoms, is used.
Monocarboxylic acid. ) Is prepared. Then, 5 parts by weight of S-REC KS-1 and 3 parts by weight of melicinic acid were added to form 5 parts by weight.
A coating solution of the heat-sensitive recording material of Example 1 is prepared by dissolving it in 0 part by weight of tetrahydrofuran (hereinafter, also referred to as THF). Then, the coating solution is applied onto the support 13 by the bar coating method here. Next, this sample is dried at a temperature of 120 ° C. in the air atmosphere. This drying time is the time that can remove the solvent THF. next,
The protective layer 17 is formed on the reversible thermosensitive recording layer 15. The medium 11 of Example 1 formed in this way is clouded over the entire surface. Further, as shown in FIG. 2, the medium 11 is heated to T ₂ or more and then rapidly cooled (in this case,
Shows the maximum transparency in the case of 50 ℃ / second or more),
When the material is rapidly cooled (in this case, 50 ° C./second or more) after being heated to T ₁ or more and T ₂ (T ₁ <T ₂ ) or less, or gradually cooled after being heated to T ₁ or more (in this case, 50 ° C.). /
The heat history-transparency characteristics such that the minimum transparency is exhibited in each case, and T ₁ = 90 ° C. and T ₂ = 120 ° C. are exhibited. Do you get it.

Next, the medium 11 is selectively heated by the heating means. Here, a word processor equipped with a thermal head (here, a word processor made by Sharp "Shoin WD-A8"
00 ”was used. ), The medium 11 was set in place of the thermal recording paper for word processing, and printing recording was performed on the medium 11. As a result, as shown in FIG. 3A, the print recording portion 21 (here, the portion on which the three characters "ABC" are printed)
Is transparent and the other part (background) is cloudy (Fig. 3).
(A) Middle hatching is shown. ) Is a medium having an image that is. As a comparative example, FIG. 3B shows an example of an image formed on a medium of the type disclosed in JP-A-64-14078 when the recording is performed by a heating means. In the comparative example, an image is formed in which the print recording portion 23 is in a cloudy state (here, indicated by black characters “ABC”) and the background portion 25 is in a transparent state.

Further, the densities of the cloudy part and the transparent part of the image formed on the medium of Example 1 were measured by a Macbeth densitometer RD920, and the cloudy part OD = 0.50,
It was found that the medium was capable of high-contrast recording, such as transparent portion OD = 1.50. However, since this density measurement was carried out in a state where the medium was placed on a black background, the measured value of the transparent portion substantially corresponds to the density of the black background (the same applies to each measurement below).

Next, the medium having such an image is OH
When the image was projected on the projection surface using P, the light transmitted through the recorded character image portion (transparent portion) was projected on the projection surface, and an image was formed on this projection surface. Next, the medium 11 on which the image is formed in this way is heated to 130 ° C. in this embodiment.
It was found that the image can be erased and the medium 11 can be returned to the opaque state by putting it in the circulation type constant temperature bath whose temperature is controlled. The temperature for erasing the image is not limited to 130 ° C. Softening temperature of the matrix material itself (2 in the embodiment)
It is obvious that any temperature higher than T ₂ (120 ° C. in this case) can be achieved if the temperature is 00 ° C. or less. Also,
An erasing condition of heating to T ₁ (T ₁ <T ₂ ) or more and T ₂ or less and then rapidly cooling (for example, 50 ° C./sec or more) may be used. Further, the erasing means is not limited to the constant temperature bath, and may be any suitable one such as a heat roll, a resistance heater, and a thermal head.

Further, even if the process of writing and erasing recording once on the medium 11 of the first embodiment is set as one cycle and this process is repeated 100 times, the densities of the cloudy part and the transparent part are the initial values ( Cloudy part OD = 0.5
0, transparent part OD = 1.50), no change was found.

1-2. Example 2 Next, as an organic low molecular weight substance, carbon number is at least 10
An example in which melissinic acid, which is one type of monocarboxylic acid that is, and octadecanenic acid (one dicarboxylic acid having 18 carbon atoms), which is one type of dicarboxylic acid having at least 10 carbon atoms, are mixed and used. explain. Specifically, instead of using 3 parts by weight of melissic acid in Example 1, 2 parts by weight of melissic acid and 1 part by weight of octadecanoic acid were used, and otherwise the same procedure as in Example 1 was carried out. Example 2
A coating solution of is prepared. Then, in the same manner as in Example 1, the coating solution is applied and the applied film is dried. The obtained medium was cloudy over the entire surface.

The medium relating to the combination of the matrix material and the organic low molecular weight substance of Example 2 has the thermal history-transparency characteristics of the tendency shown in FIG. 2, where T ₁ = 95 ° C. and T ₂ = 1.
It was found that the material exhibits a characteristic of 20 ° C.

Further, when printing recording was performed on the medium of this Example 2 by a thermal printer (here, AP-700 manufactured by Epson Sales Co., Ltd.), the same characteristic as that of Example 1 was obtained in which the printing recording section was transparent. Indicated. It was also found that the projection image formation by OHP and the image erasure by the constant temperature bath can be performed in the same manner as in Example 1.

Further, the densities of the white turbid portion and the transparent portion of the image formed on the medium of the second embodiment are measured by the Macbeth densitometer RD92.
When measured by 0, the cloudy part OD = 0.5
It was found that a high-contrast image such as 5, transparent part OD = 1.50 was obtained. Further, it was found that the density of each of the cloudy part and the transparent part did not change from the initial value even when the process of writing and erasing the record once was set as one cycle and this process was repeated 100 cycles.

1-3. Example 3 Next, as an organic low molecular weight substance, carbon number is at least 10
Nonacosanoic acid (having 29 carbon atoms), which is one of the monocarboxylic acids, and Hentriacontanoic acid (having 31 carbon atoms), and Tritriacontanoic acid (having 33 carbon atoms). Thing) and carbon number of at least 1
An example in which octacosanol (a derivative having 18 carbon atoms and serving as an alcohol), which is one kind of monocarboxylic acid derivatives having 0, is mixed and used will be described. Specifically, instead of using 3 parts by weight of melicinic acid in Example 1, 0.5 parts by weight of nonacosanoic acid, 1 part by weight of hentriacontanoic acid, 1 part by weight of tritriacontanoic acid, and A coating solution of Example 3 is prepared in the same manner as in Example 1 except that 0.5 part by weight of octacosanol is used. Then, in the same manner as in Example 1, the coating solution is applied and the applied film is dried. The obtained medium was cloudy over the entire surface.

The medium relating to the combination of the matrix material and the organic low molecular weight substance of Example 3 has the thermal history-transparency characteristics of the tendency shown in FIG. 2, where T ₁ = 90 ° C. and T ₂ = 1.
It was found that the material exhibits a characteristic of 20 ° C.

Further, when printing recording was performed on the medium of this Example 3 by a thermal printer (here, AP-700 manufactured by Epson Corporation), the same characteristic as that of Example 1 was obtained in which the printing recording portion was transparent. Indicated. It was also found that the projection image formation by OHP and the image erasure by the constant temperature bath can be performed in the same manner as in Example 1.

Also, the densities of the white turbid portion and the transparent portion of the image formed on the medium of the third embodiment are Macbeth densitometer RD92.
When measured by 0, the cloudy part OD = 0.5
It was found that a high-contrast image such as 0 and transparent portion OD = 1.50 was obtained. Further, it was found that the density of each of the cloudy part and the transparent part did not change from the initial value even when the process of writing and erasing the record once was set as one cycle and this process was repeated 100 cycles.

1-4. Example 4 Next, as an organic low molecular weight substance, carbon number is at least 10
Nonacosanoic acid (having 29 carbon atoms), which is one of the monocarboxylic acids, and Hentriacontanoic acid (having 31 carbon atoms), and Tritriacontanoic acid (having 33 carbon atoms). Thing) and carbon number of at least 1
An example will be described in which docosannic acid (having 22 carbon atoms and a derivative as an amide), which is one of the derivatives of dicarboxylic acid having 0, is mixed and used. Specifically, instead of using 3 parts by weight of melicinic acid in Example 1, 0.5 parts by weight of nonacosanoic acid, 1 part by weight of hentriacontanoic acid, 1 part by weight of tritriacontanoic acid, and A coating solution of Example 4 is prepared in the same manner as in Example 1 except that 0.5 part by weight of docosanoic acid amide is used. Then, in the same manner as in Example 1, the coating solution is applied and the applied film is dried. The obtained medium was cloudy over the entire surface.

The medium relating to the combination of the matrix material and the organic low molecular weight substance of Example 4 has the thermal history-transparency characteristics of the tendency shown in FIG. 2, where T ₁ = 92 ° C. and T ₂ = 1.
It was found that the material exhibits a characteristic of 20 ° C.

Further, when printing recording was performed on the medium of this Example 4 by a thermal printer (here, AP-700 manufactured by Epson Corporation), the same characteristic as that of Example 1 was obtained in which the printing recording section was transparent. Indicated. It was also found that the projection image formation by OHP and the image erasure by the constant temperature bath can be performed in the same manner as in Example 1.

Also, the densities of the white turbid portion and the transparent portion of the image formed on the medium of Example 4 were measured by the Macbeth densitometer RD92.
When measured by 0, the cloudy part OD = 0.5
5, transparent part OD = 1.45, it was found that a high contrast image was obtained. Further, it was found that the density of each of the cloudy part and the transparent part did not change from the initial value even when the process of writing and erasing the record once was set as one cycle and this process was repeated 100 cycles.

Although the embodiments of the present invention have been described above, the present invention is not limited to the above embodiments.

For example, both or one of the support 13 and the protective layer 17 of the medium 11 may be provided with another layer (hereinafter referred to as a function-adding layer) in order to enhance the function of the medium 11. Some examples are shown below.

First, FIG. 4A shows that the support 13 is provided with a function such as a recording layer other than the reversible thermosensitive recording layer 15 of the present invention or a display layer capable of displaying by a method other than the thermal recording of the present invention. The example which provided the layer 31 is shown. In FIG. 4, 33 is a protective layer for protecting the function-added layer 31. Here, the function-added recording layer 31 is, for example, a reversible thermosensitive recording layer of the type disclosed in JP-A-64-14078 in which the heating part becomes cloudy, a polymer blend type reversible thermosensitive recording layer, a leuco It can be a reversible thermosensitive recording layer using a dye, and further a recording layer according to a completely different recording format, for example, a magnetic recording layer. Further, it may be a display layer which is pre-displayed with a dye, paint, ink or the like. Further, as shown in FIG. 4B, the function addition layer 31 may be provided on the protective layer 17 side. Note that the example shown in FIG. 4B shows an example in which the positional relationship between the light source of the projection device and the projection surface (screen) with respect to the medium 11 is reversed from that in FIG.
That is, an example is shown in which the projection surface (screen) is arranged on the support 13 side and the projection device is arranged on the protective layer side to use the medium 11. Such a usage is performed by the function addition layer 3
It is not possible only when 1 is added. The medium shown in FIG. 1 may also be used by reversing the positional relationship between the light source of the projection device and the projection surface (screen) with respect to the medium 11 as compared with the case of FIG. FIG. 5 shows a usage example in which the positional relationship between the light source and the projection surface (screen) of the projection device with respect to the medium 11 is reversed. Figure 4
In the example of using the medium shown in FIG. 5B or FIG. 5, the surface on the transmission side is a portion which is not in contact with the heating means, so that the surface roughness is small and the amount of scattered light is reduced. Therefore, the effect of making the projected image clearer can be obtained.

It is also possible to attach a filter for controlling the amount of long-wavelength region light to the front surface and the back surface of the medium. Alternatively, at least one layer of the protective layer 17, the reversible thermosensitive recording layer 15 and the support 13 may be mixed with a substance for controlling the amount of long wavelength light. By doing so, it is possible to obtain the effect that it is possible to prevent the projection image formed through the medium from becoming a reddish image.

In the above embodiment, the medium of the present invention is O
The example used for HP has been described. However, the medium of the present invention can be widely used as a medium for projection image formation other than OHP. For example, the same effect was obtained when used as a medium for a slide projector.

Further, in the above-mentioned embodiment, the example in which the medium is composed of the support, the reversible thermosensitive recording layer and the protective layer is shown, but an intermediate layer may be provided if necessary.

[0045]

As is apparent from the above description, according to the present invention, a reversible thermosensitive recording layer comprising a matrix material and an organic low molecular weight substance is provided on a transparent sheet-shaped support. Since polyvinyl acetal was used as a matrix material in the medium for sensitized heat recording projection images,
By the heating means of the medium, a printed and recorded portion becomes a transparent portion, and the other portion becomes an opaque state (white turbid state). Generally, in an image, the area of the print recording portion is smaller than the area of the background portion, so that the projected image formed by setting the medium on which the image is formed on the OHP has a small amount of transmitted light. . Therefore, it is possible to obtain a projected image in which the eyes of the person who views the projected image are not tired.

Further, in particular, according to the constitution in which the organic low molecular weight substance is selected from a predetermined carboxylic acid group, the condition for making the transparent state opaque is looser than before, and the transparent state is stable up to a higher temperature than before. It becomes a medium. For this reason, recording can be performed by a simple recording means such as a thermal head, and the recorded data is not erased by heat from the light source of the projection device (excellent retention of recorded data). A new reversible thermosensitive recording medium for projection images can be obtained.

[Brief description of drawings]

FIG. 1 is a sectional view of essential parts for explaining a reversible thermosensitive recording projection image medium of Example.

FIG. 2 is a diagram for explaining the medium for a reversible thermosensitive recording projection image of the present invention, and is a characteristic diagram showing a change in transparency with respect to the thermal history of the reversible thermosensitive recording layer.

FIG. 3 is a diagram showing a state of an image formed on a reversible thermosensitive recording projection image medium of an example together with a comparative example,
(A) is the example, and (B) is the comparative example.

FIG. 4A and FIG. 4B are diagrams for explaining another embodiment.

FIG. 5 is an explanatory diagram of another usage example of the medium.

[Explanation of symbols]

 11: Reversible thermosensitive recording projection image medium of Example 13: Transparent sheet-like support 15: Reversible thermosensitive recording layer 17: Protective layer 21, 23: Print recording part 25: Background part (becomes transparent ) 31: Function-added layer 33: Protective layer

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Takeyuki Sekiya 1-7-12 Toranomon, Minato-ku, Tokyo Oki Electric Industry Co., Ltd.

Claims (2)

[Claims] 1. A reversible thermosensitive recording projection image medium comprising a reversible thermosensitive recording layer containing a matrix material and an organic low-molecular substance on a transparent sheet-like support, wherein polyvinyl acetal is used as the matrix material. A medium for reversible thermosensitive recording projection images, which is characterized in that 2. The reversible thermosensitive recording projection image medium according to claim 1, wherein the organic low-molecular substance is a monocarboxylic acid having at least 10 carbon atoms, a dicarboxylic acid having at least 10 carbon atoms, or carbon. A reversible thermosensitive recording projection image medium containing one or more selected from the group consisting of monocarboxylic acid derivatives having at least 10 carbon atoms and dicarboxylic acid derivatives having at least 10 carbon atoms.