JPH10259362A - Hardenable self-adhesive sheet - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a hardenable self-adhesive sheet which can be temporarily stuck many times in positioning and provides a strong adhesion when heated after the sticking position is determined by laminating a release paper, a thermally hardenable self-adhesive layer which exhibits a weak self-adhesiveness in the normal state and realizes a strong adhesion when heated to a certain temp. or higher, and a substrate. SOLUTION: The thermally hardenable self-adhesive layer comprises a solid plasticizer and thermoplastic resin. Ester compds. having an m.p. of about 40-130 deg.C such as diphenyl phthalate, tribenzoic glyceride, and steartic monoglyceride are examples of the plasticizer. The plasticizer is used in the form of an aq. dispersion with a particle size of 10 μm or lower or in the form of microcapsules. As the thermoplastic resin, a resin having self-adhesiveness at normal temp. and a glass transition point of -20 deg.C or lower, pref. -40 deg.C or lower, is used in the form of an emulsion. Examples of the resin are a (meth) acrylic ester copolymer, an SB copolymer, and an ethylene-vinyl chloride copolymer.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention can be applied in a releasable manner until a sticking position is determined, and after the sticking position is determined, shows good adhesive strength by heating and can be fixed to an adherend. The present invention relates to an adhesive sheet which can be formed.

[0002]

2. Description of the Related Art Among pressure-sensitive adhesive sheets comprising a support, a pressure-sensitive adhesive layer and a release paper, conventionally, a pressure-sensitive adhesive sheet which can be peeled off at the time of lamination and can be simply laminated by pressure alone has been widely used. However, when the adhesive sheet is inadvertently pasted on the adherend, if the adhesive sheet is peeled off to reapply, the adhesive sheet may curl or wrinkle. There was a problem of tearing. Recently, removable adhesives have been developed, but removable adhesives have a low basic adhesive performance. There was a dilemma that they would come off.

A heat-sensitive adhesive which does not exhibit tackiness at room temperature, exhibits tackiness when heated, and maintains tackiness even after tackiness has been developed has been known. The heat-sensitive adhesive has a solid plasticizer and a thermoplastic resin as essential components,
These are mixed with a tackifier and the like, and a heat-sensitive adhesive sheet is obtained by applying the mixture to a support. The pressure-sensitive adhesive layer surface of the heat-sensitive pressure-sensitive adhesive sheet does not show any tackiness at room temperature, but develops tackiness by heating, and maintains the tackiness for a while even after removing the heat source. First the solid plasticizer melts,
It is considered that tackiness is exhibited by dissolving the thermoplastic resin and the tackifier. However, since the heat-sensitive adhesive sheet does not show any adhesiveness at room temperature, it is impossible to temporarily fix the heat-sensitive adhesive sheet to an adherend.

[0004] Adhesives activated by heating include:
In addition, heat-sealable adhesives and hot-melt adhesives are also known, but these are activated only at high temperatures and lose their adhesive strength when cooled to room temperature, so it is impossible to temporarily fix them to the adherend. It is possible.

On the other hand, a heat-sensitive recording sheet having a heat-sensitive recording layer which is colorless or light-colored in a normal state but develops a color upon heating on a support is subjected to pressure-sensitive adhesive processing on the back surface and laminated with a release paper. As a sheet, letters, numbers, patterns,
It is used by attaching symbols and patterns to articles after thermal recording. In such an adhesive thermosensitive recording sheet, if it is accidentally pasted on an adherend and you try to peel it off to reapply it, the adhesive thermosensitive recording sheet will curl or wrinkle, and in the worst case Had a problem that the sheet was torn.

[0006]

SUMMARY OF THE INVENTION In view of the above situation, an object of the present invention is to temporarily fix and reattach as many times as necessary until the position to be adhered to an adherend is determined. The purpose of the present invention is to obtain a pressure-sensitive adhesive sheet which allows stronger bonding and cannot be easily peeled off.

[0007]

As a result of various studies on the adhesive sheet, the present inventor has determined that the pressure-sensitive adhesive layer which is a component of the adhesive sheet is a heat-sensitive adhesive layer. By this, in the normal state, the tackiness to the adherend is weak, so it is possible to temporarily fix and re-attach as many times as possible, and after the sticking position is determined, strong adhesion is obtained by heating the adhesive sheet. Found that it is possible.

That is, according to the present invention, a release paper, a heat-sensitive adhesive layer and a support, which are weakly tacky in a normal state and exhibit strong adhesiveness when heated to a certain temperature or more, are successively laminated. This is a heat-sensitive adhesive sheet that has a structure and can be temporarily fixed and re-attached and can be firmly bonded by heating.

Furthermore, a release paper, a heat-sensitive adhesive layer, a support, a heat-sensitive recording layer, which has a weak tackiness in a normal state and exhibits strong adhesiveness when heated to a certain temperature or more,
Is a heat-sensitive adhesive recording sheet having a structure in which are sequentially laminated, can be temporarily fixed and re-attached, and can be firmly bonded by heating.

Furthermore, the minimum color development temperature of the heat-sensitive recording layer is 20 ° C. lower than the minimum temperature at which the heat-sensitive adhesive layer exhibits adhesiveness.
The heat-sensitive adhesive recording sheet of the present invention is characterized in that the heat-sensitive adhesive recording sheet has the above-mentioned properties.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the heat-sensitive adhesive sheet and the heat-sensitive adhesive heat-sensitive recording sheet of the present invention will be described in detail. The heat-sensitive adhesive sheet according to the first aspect of the present invention comprises a release paper, a heat-sensitive adhesive layer which exhibits weak adhesiveness under normal conditions and exhibits strong adhesiveness when heated to a certain temperature or higher ( Hereinafter, simply referred to as a heat-sensitive adhesive layer),
Consists of a support.

The heat-sensitive adhesive layer according to the present invention comprises at least a solid plasticizer and a thermoplastic resin. Examples of the solid plasticizer constituting the heat-sensitive adhesive layer include diphenyl phthalate, dihexyl phthalate, dicyclohexyl phthalate, dihydroabiethyl phthalate, dimethyl isophthalate, sucrose benzoate, ethylene glycol dibenzoate, and tribenzoic acid. Catechol dipalmitate, catechol distearate, catechol diester, etc. Various ester compounds having a melting point in the range of about 40 to 130 ° C, such as benzoate, stearyl stearate, behenyl monoglyceride, and stearic monoglyceride, may be used. These are used alone or in combination of two or more.

These solid plasticizers and compounds are atomized by a wet or dry pulverizer such as a ball mill, a sand mill, a paint shaker, a dyno mill, an attritor, a Henchel mixer and used as an aqueous dispersion. It is also possible to use microencapsulated by the method. Particle size of solid plasticizer is 10μm
Or less, more preferably 5 μm or less,
From a practical point of view, it is 1-2 μm.

Further, liquid plasticizers such as dimethyl phthalate, diethyl phthalate, dibutyl phthalate and dibutyl maleate can be microencapsulated by a conventionally known method and apparently used as a solid plasticizer according to the present invention as a solid plasticizer. It is also possible to use them together. Also in this case, the preferred particle size is 1 to 10 μm.

The thermoplastic resin constituting the heat-sensitive adhesive layer is preferably a resin having a low glass transition temperature such that it has tackiness even at room temperature, and has a glass transition temperature (Tg) of -20 ° C. or lower, more preferably − A thermoplastic resin emulsion having a temperature of 40 ° C. or lower is used. For example, (meth) acrylate copolymer, styrene-isoprene copolymer, styrene-acrylate copolymer, styrene-butadiene copolymer, acrylonitrile-butadiene copolymer,
Ethylene-vinyl acetate copolymer, vinyl acetate-acrylate copolymer, ethylene-vinyl chloride copolymer,
Ethylene-acrylic ester copolymer, ethylene-acrylic acid copolymer, ethylene-vinyl chloride copolymer, vinyl acetate-ethylene-acrylic acid copolymer, vinyl acetate-ethylene-acrylic ester copolymer, vinyl acetate Resins such as ethylene-styrene copolymer, vinyl acetate-ethylene-vinyl chloride copolymer, polybutadiene, and polyurethane. These are used alone or in combination of two or more.

The heat-sensitive adhesive layer of the present invention must be able to be temporarily fixed and re-attached to an adherend any number of times in a normal state. More specifically, the 180 ° adhesive strength to a stainless steel plate according to JIS Z0237 is 10 gf / 25 mm or more and 200 gf / 25 m before heating and fixing.
m, more preferably 20 gf / 25 mm or more and 100
gf / 25 mm or less. In addition, after the sticking position is determined, strong adhesiveness is developed by heating, and it is necessary to increase the adhesive strength before it can be easily peeled off. More specifically, the 180 ° adhesive strength to a stainless steel plate according to JIS Z0237 is 300 gf after heat fixing.
/ 25 mm or more, more preferably 500 gf / 25 mm or more. Such adjustment of the adhesive force can be achieved by changing the mixing ratio of the solid plasticizer in the heat-sensitive adhesive layer.

In the present invention, the mixing ratio of the solid plasticizer is
The content is preferably in the range of 5 to 30% by weight based on the total solid content of the heat-sensitive adhesive composition. More preferably, 1
0 to 20% by weight. If the ratio of the solid plasticizer is less than this range, the adhesive strength before heat fixing is too strong, so that it is difficult to re-attach after temporary fixing to the adherend, or the increase in adhesive strength due to heating is small and the adhesive can be fixed. Or not. On the other hand, if it exceeds this range, the adhesive force before heating is lost, so that temporary fixing for positioning cannot be performed.

A tackifier may be added to the heat-sensitive adhesive layer according to the present invention in order to improve the adhesive strength. Specific examples of the tackifier used in the present invention include terpene resin, aliphatic petroleum resin, aromatic petroleum resin, coumarone indene resin, styrene resin, phenol resin,
Terpene phenol resin, rosin derivative resin and the like are used.

These tackifiers are thermoplastic resins 100
200 parts by weight or less, preferably 50 to 150 parts by weight. If the mixing ratio is less than this range, the effect of the addition is small, and if the mixing ratio is beyond this range, the adhesive strength tends to decrease.

A filler or the like can be added to the heat-sensitive adhesive layer according to the present invention as long as the object of the present invention is not hindered. For example, carbonates, oxides such as aluminum, zinc, magnesium, barium, and titanium can be added. , Hydroxides, sulfates and the like, and inorganic pigments including viscosities such as natural silica, clay, zeolite, kaolin, calcined kaolin, starch,
Styrene resin, melamine resin, acrylic resin, paraffin, natural wax, synthetic wax and the like can be used.

The heat-sensitive adhesive layer according to the present invention may contain an aqueous polymer binder, for example, an aqueous polymer binder, for the purpose of increasing the cohesive force in the heat-sensitive adhesive layer or the support or the heat-sensitive adhesive layer. Polyvinyl alcohol, polyvinyl acetate, oxidized starch, etherified starch, cellulose derivatives such as carboxymethylcellulose, hydroxyethylcellulose, casein, gelatin, sodium alginate and the like can be added. The mixing ratio of the aqueous polymer binder is added within a range that does not impair the original adhesive strength of the heat-sensitive adhesive sheet, and specifically, 30% by weight or less based on the total solid content of the heat-sensitive adhesive layer. Preferably, it is used in a range of 10% by weight or less.

In the heat-sensitive adhesive layer according to the present invention, various components such as a hardener, a preservative, a dye, an ultraviolet absorber, an antioxidant, a pH adjuster, an antifoaming agent and the like may be used, if necessary. Additives can be added.

The base paper preferably used for the support according to the present invention is composed mainly of wood pulp and filler. As wood pulp, chemical pulp such as LBKP, NBKP, GP, PGW, RMP, TMP, CTMP, C
Including mechanical pulp such as MP and CGP, pulp such as waste paper pulp such as DIP, etc., if necessary, conventionally known pigments, binders and sizing agents, fixing agents, retention agents, cationizing agents, paper strength agents, etc. By mixing one or more kinds of various additives, a support can be produced by various apparatuses such as a fourdrinier paper machine, a round paper machine, a twin wire paper machine, and the like, and can be made acidic, neutral, or alkaline. Further, the base paper may be subjected to on-machine processing of a calender device including a metal roll and a synthetic resin roll. At that time, off-machine processing may be performed, and after the processing, flatness may be controlled by further performing calendar processing using a machine calendar, a super calendar, or the like.

As the filler used for the base paper, for example,
Light calcium carbonate, heavy calcium carbonate, kaolin,
Clay, talc, calcium sulfate, barium sulfate, titanium dioxide, zinc oxide, zinc sulfide, satin white, aluminum silicate, diatomaceous earth, calcium silicate, magnesium silicate, synthetic silica, aluminum hydroxide, alumina, lithopone, zeolite, magnesium carbonate, Examples include white inorganic pigments such as magnesium hydroxide, styrene-based plastic pigments, acrylic-based plastic pigments, polyethylene, microcapsules, and organic pigments such as urea resin and melamine resin.

Examples of the sizing agent used for base paper include a rosin sizing agent for acidic papermaking, a modified rosin sizing agent for neutral papermaking, AKD, ASA, and a cationic polymer type sizing agent.

Further, an inorganic pigment such as silica, alumina, titanium oxide, kaolin, clay, talc, zinc oxide, barium sulfate, starch granules, cellulose powder, melamine resin fine particles, guanamine resin fine particles,
Organic pigments such as urethane-based resin particles, epoxy-based resin particles, silicone-based resin particles, and vinyl-based resin particles, hollow pigments such as vinyl-based resin hollow particles and melamine-based resin hollow particles, starch, casein, gelatin, polyvinyl alcohol, and carboxy. Water-soluble resins such as methylcellulose and hydroxyethylcellulose, resin emulsions such as styrene-butadiene, acrylic and vinyl acetate, dispersants, crosslinkers, dyes, fluorescent agents, ultraviolet absorbers, antioxidants, preservatives, and surfactants Gravure coater, pigment coating layer containing defoamer, thickener, conductive agent, etc.
Those coated with a roll coater, rod coater, die coater, curtain coater, blade coater, or the like can be used.

The support according to the present invention may further include a plastic sheet of polyethylene, polypropylene, polyethylene terephthalate, polyamide, or the like, or a synthetic paper or nonwoven fabric made of these synthetic fibers, or a synthetic resin laminated on one or both sides of the paper. Laminated paper, metal foil, or metal foil and paper, vapor-deposited paper, opaque sheet subjected to hologram treatment, bonded product of synthetic resin film, mica paper, glass paper, and the like can also be used.

Various known techniques such as conducting a conductive treatment to prevent troubles in paper feeding and stacking, and providing an undercoat layer between the support and the heat-sensitive adhesive layer may be used as necessary. Can be added.

The drying conditions for coating or printing on the support must be such that the solid plasticizer used does not melt. As a drying method, a drying method using a heat source by infrared rays, microwaves, or high frequency can be used in addition to hot air drying.

The coating amount of the heat-sensitive adhesive layer depends on the composition of the heat-sensitive adhesive layer and the material of the adherend to be bonded, but is usually 1 to 50 g / m ² in terms of the dry coating amount. Is 5
It is applied in a range of 35 g / m ² . If the coating amount of the heat-sensitive adhesive layer is less than 1 g / m ² , a sufficient adhesive force cannot be obtained when the adhesive layer is temporarily fixed to an adherend or bonded by heating. On the other hand, if it exceeds 50 g / m ² , the adhesive function is saturated, which is not economically preferable.

After the heat-sensitive adhesive sheet of the present invention is removably attached to an adherend, the adhesive is fixed by heating. As a method for fixing the adhesive by heating, in addition to the method using hot air, a thermocompression bonding method using an iron or a hot roll, a method using a heat source using infrared rays, microwaves, or high frequencies can be used.

Since the heat-sensitive adhesive layer of the heat-sensitive adhesive sheet of the present invention has a weak tackiness even in a normal state,
It is necessary to provide a release paper on the sheet surface facing the heat-sensitive adhesive layer.

Examples of the release paper according to the present invention include films having a releasability per se such as polyolefin resin films and fluororesin films, high-density base papers such as glassine paper, and silicone as a release agent for papers and films. Release components such as resin, fluororesin, and long-chain alkyl compound,
A coated and dried product having a dry coating amount of about 0.05 to 3 g / m ² is used.

The heat-sensitive adhesive and heat-sensitive recording sheet according to the second invention has a heat-sensitive recording property comprising a release paper, a heat-sensitive adhesive layer, a support and a heat-sensitive recording layer. It is a sheet that can be re-attached and can be firmly bonded by heating. The sheet of the present invention can be used as a label.

The color former and developer used in the heat-sensitive recording layer according to the present invention are not particularly limited as long as they are generally used for heat-sensitive recording paper. For example, as a coloring agent for the heat-sensitive recording layer, triallylmethane compounds, diarylmethane compounds, xanthene compounds,
Thiazine compounds, spiropyran compounds, diphenylmethane dyes, spiro dyes, lactam dyes, fluoran dyes and the like can be used.

Specifically, 3,3-bis (p-dimethylaminophenyl) -6-dimethylaminophthalide (crystal violet lactone), 3,3-bis (p-dimethylaminophenyl) phthalide, 3- ( p-dimethylaminophenyl) -3- (1,2-dimethylindol-3-yl) phthalide, 3- (p-dimethylaminophenyl) -3- (2-methylindol-3-yl) phthalide, 3 , 3-Bis (1,2-dimethylindole-3
-Yl) -5-dimethylaminophthalide, 3,3-bis (9-ethylcarbazol-3-yl) -6-dimethylaminophthalide, 3,3-bis (2-phenylindol-3-yl)- 6-dimethylaminophthalide, 3-p
-Dimethylaminophenyl-3- (1-methylpyrrol-3-yl) -6-dimethylaminophthalide, 3-p-
Dimethylaminophenyl-3- (1-methylpyrrole-
2- (yl) -6-dimethylaminophthalide 3- (p-dimethylaminophenyl) -3- (2-methylindol-3-yl) phthalide, 3- (p-dimethylaminophenyl) -3- (2- Phenylindol-3-yl) phthalide, 3,3-bis (1,2-dimethylindole-
3-yl) -5-dimethylaminophthalide, 3,3-bis (1,2-dimethylindol-3-yl) -6-dimethylaminophthalide, 3,3-bis (9-ethylcarbazole-3- Yl) -5-dimethylaminophthalide,
3,3-bis (2-phenylindol-3-yl)-
Triallylmethane dyes such as 5-dimethylaminophthalide.

4,4'-bis-dimethylaminophenylbenzhydryl benzyl ether, 4,4'-bis-dimethylaminobenzhydryl benzyl ether, N-halophenylleucouramine, N-2,4,5- Diphenylmethane dyes such as trichlorophenylleuco auramine.

Thiazine dyes such as benzoyl leucomethylene blue and p-nitrobenzoyl leucomethylene blue.

3-methyl-spiro-dinaphthopyran, 3
-Ethyl-spiro-dinaphthopyran, 3,3'-dichlorospirodinaphthopyran, 3-phenyl-spiro-dinaphthopyran, 3-benzyl-spiro-dinaphthopyran,
3-propylspirobenzopyran, 3-methylnaphtho-
Spiro dyes such as (3-methoxybenzo) spiropyran, 3-methyl-naphtho (6'-methoxybenzo) spiropyran, and 3-propyl-spiro-dibenzopyran.

Lactam dyes such as rhodamine-B-anilinolactam, rhodamine (p-nitroanilino) lactam and rhodamine (o-chloroanilino) lactam;

Rhodamine B anilinolactam, rhodamine Bp-chloroanilinolactam, 3-diethylamino-7-dibenzylaminofluoran, 3-dimethylamino-7-dibenzylaminofluoran, 3-diethylamino-7- Octylaminofluoran, 3-diethylamino-7-phenylfluoran, 3-dimethylamino-7-methoxyfluoran, 3-diethylamino-7-
N-diethylaminofluoran, 3-diethylamino-
7-methoxyfluoran, 3-diethylamino-6-methoxyfluoran, 3-diethylamino-6-methyl-
7-chlorofluorane, 3-diethylamino-7-chlorofluorane, 3-diethylamino-6-chloro-7-
Methylfluoran, 3-diethylamino-7- (3,4
-Dichloroanilino) fluoran, 3-diethylamino-7- (2-chloroanilino) fluoran, 3-diethylamino-6-methyl-7-anilinofluoran, 3-
Diethylamino-6-methyl-7-phenylaminofluoran, 3-diethylamino-6,7-dimethylfluoran, 3- (N-ethyl-N-tolyl) amino-6-methyl-7-anilinofluoran, 3 -Piperidino-6
Methyl-7-anilinofluoran, 3- (N-ethyl-
N-tolyl) amino-6-methyl-7-phenethylfluoran, 3-diethylamino-7- (4-nitroanilino) fluoran, 3-dibutylamino-6-methyl-7
-Anilinofluoran, 3- (N-methyl-N-propyl) amino-6-methyl-7-anilinofluoran, 3
-(N-ethyl-p-toluidino) -7-methylfluoran, 3- (N-ethyl-p-toluidino) -6-methyl-7-phenylaminofluoran, 3- (N-ethyl-p-toluidino) ) -6-Methyl-7- (p-toluidino) fluoran, 3-diethylamino-7- (2-carbomethoxy-phenylamino) fluoran, 3-diethylamino-7-N-acetyl-N-methylaminofluoran, 3 -(N-ethyl-N-isoamyl) amino-6
-Methyl-7-anilinofluoran, 3-diethylamino-7-N-chloroethyl-N-methylaminofluoran, 3-diethylamino-7-methyl-N-benzylaminofluoran, 3-diethylamino-7-N- Methylaminofluoran, 3- (N-methyl-N-cyclohexyl) amino-6-methyl-7-anilinofluoran,
3- (N-ethyl-N-iso-amylamino) -6-methyl-7-phenylaminofluoran, 3- (N-cyclohexyl-N-methylamino) -6-methyl-7-phenylaminofluoran, -(N-ethyl-N-tetrahydrofuryl) amino-6-methyl-7-anilinofluoran, 3-piperidino-6-methyl-7-phenylaminofluoran, 3-pyrrolidino-6-methyl-7-
Phenylaminofluoran, 3-diethylamino-6-
Methyl-7-xylidinofluoran, 3-diethylamino-7- (o-chlorophenylamino) fluoran, 3
-Dibutylamino-7- (o-chlorophenylamino)
Fluorane dyes such as fluorane and 3-pyrrolidino-6-methyl-7-p-butylphenylaminofluoran.

As the color developer of the heat-sensitive recording layer used in the present invention, an electron-accepting substance generally used for heat-sensitive recording paper is used. In particular, a phenol derivative, an aromatic carboxylic acid derivative or its metal compound, N, N′-diarylthiourea derivatives, mixtures of organic acids and metal compounds, acidic polymers (eg phenol / formaldehyde resins,
Salicylic acid resins or their zinc, magnesium,
Aluminum, calcium, titanium, manganese, tin,
And the like. In particular, phenol derivatives, aromatic carboxylic acid derivatives or metal compounds thereof, N, N'-diarylthiourea derivatives and the like can be used.

Among them, particularly preferred are phenol derivatives, aromatic carboxylic acids and phenolic compounds thereof, and specifically, 1,1-bis (p-hydroxyphenyl) propane and 2,2-bis (p -Hydroxyphenyl) propane, 2,2-bis (p-hydroxyphenyl) butane, 2,2-bis (p-hydroxyphenyl)
Hexane, bisphenolsulfone, bis (3-allyl-4-hydroxyphenyl) sulfone, 4-hydroxy-4'-isopropyloxydiphenylsulfone, 3,4-dihydroxy-4'-methyldiphenylsulfone, diphenolether, p-hydroxy Benzyl benzoate, propyl p-hydroxybenzoate, p-
Butyl hydroxybenzoate, p-tert-butylbenzoic acid, trichlorobenzoic acid, octyl 4-hydroxybenzoate, benzoic acid, terephthalic acid, 3-sec-butyl-4
-Hydroxybenzoic acid, 3-cyclohexyl-4-hydroxybenzoic acid, 3,5-dimethyl-4-hydroxybenzoic acid, salicylic acid, 3-isopropylsalicylic acid, 3
-Tert-butylsalicylic acid, 3-benzylsalicylic acid,
3- (α-methylbenzyl) salicylic acid, 3-chloro-
5- (α-methylbenzyl), 3,5-di-α-methylbenzylsalicylic acid, 3,5-di-tert-butylsalicylic acid, 3-phenyl-5- (α, α-dimethylbenzyl) salicylic acid, 4- tert-butylphenol, 4-hydroxydiphenoxide, α-naphthol, β-naphthol, 4-hydroxyacetophenol, 4-tert-catechol, 2,2′-dihydroxydiphenol, 2,
2′-methylenebis (4-methyl-6-tert-isobutylphenol, 4,4′-isopropylidenebis (2-
tert-butylphenol), 4,4'-sec-butylidenediphenol, 4-phenylphenol, 4,4'-
Isopropylidene diphenol, 2,2′-methylenebis (4-chlorophenol), hydroquinone, 4,4 ′
-Cyclohexylidene diphenol, dimethyl 4-hydroxyphthalate, hydroquinone monobenzyl ether,
Phenolic compounds such as novolak type phenol resins and phenol polymers are exemplified.

The binder used in the heat-sensitive recording layer in the present invention includes starches, hydroxyethyl cellulose, methyl cellulose, ethyl cellulose, and the like.
Cellulose derivatives such as carboxymethyl cellulose,
Proteins such as casein and gelatin, oxidized starch,
Aqueous natural polymer compounds such as saccharose such as ester compound starch, polyvinyl alcohol, modified polyvinyl alcohol, polyvinylpyrrolidone, polyacrylic acid, sodium polyacrylate, acrylamide-acrylate copolymer, acrylamide-acrylic acid Water-soluble synthetic polymer compounds and latexes such as ester-methacrylic acid terpolymer, alkali salt of styrene-maleic anhydride copolymer, latex, polyacrylamide, styrene-maleic anhydride copolymer, ethylene- Water-soluble adhesive resin such as alkali salt of maleic anhydride copolymer, polyvinyl acetate, polyurethane, polyacrylate, styrene-butadiene copolymer, acrylonitrile-butadiene copolymer, methyl acrylate
Butadiene copolymer, acrylonitrile-butadiene-
Latexes such as an acrylic acid copolymer and an ethylene-vinyl acetate copolymer are exemplified.

In order to further improve the sensitivity of the heat-sensitive recording layer, as sensitizers, waxes such as N-hydroxymethyl stearamide, stearamide, palmitamide, and naphthol such as 2-benzyloxynaphthalene are used. Derivatives, p-benzylbiphenyl, 4-
Biphenyl derivatives such as allyloxybiphenyl, 1,
2-bis (3-methylphenoxy) ethane, 2,2′-
Polyether compounds such as bis (4-methoxyphenoxy) diethyl ether and bis (4-methoxyphenyl) ether; Carbonic acid or oxalic acid diester derivatives such as diphenyl carbonate, dibenzyl oxalate, and di (p-chlorobenzyl) oxalate can be added.

Examples of the pigment used in the heat-sensitive recording layer include diatomaceous earth, talc, kaolin, calcined kaolin, calcium carbonate, magnesium carbonate, titanium oxide, zinc oxide, silicon oxide, aluminum hydroxide, and urea-formalin resin. Can be

An intermediate layer may be provided below the heat-sensitive recording layer, that is, on the support, to improve heat-sensitive color development and prevent scum due to printing. Alternatively, color stains and water resistance may be formed on the heat-sensitive recording layer. There is no problem in providing a protective layer for the purpose of providing.

The coating method for providing the heat-sensitive adhesive layer, the heat-sensitive recording layer, the intermediate layer, and the protective layer according to the present invention includes a blade coating method, a gravure coating method, a gravure offset coating method, and the like.
Bar coating method, roll coating method, knife coating method, air knife coating method, comma coating method, U comma coating method, AKKU coating method, smoothing coating method, microgravure coating method, reverse roll coating method, four or five roll coating Construction method,
Known coating methods such as a dip coating method, a drop curtain coating method, a slide coating method, a die coating method, and the like, or various printing methods such as flexo, letterpress, gravure, and offset can be used.

The minimum color development temperature of the heat-sensitive recording layer used in the present invention is preferably 20 ° C. or more, more preferably 30 ° C. or more, higher than the lowest temperature at which the heat-sensitive adhesive layer exhibits adhesiveness. . The minimum color development temperature as used herein means that the Macbeth optical density after contacting the heat stamp heated to a constant temperature from the heat-sensitive recording layer side of the heat-sensitive adhesive recording sheet for 5 seconds is equal to the optical density before contact with the heat stamp. It indicates the temperature at which the temperature increases by 0.05 points or more. The minimum temperature at which the heat-sensitive adhesive layer exhibits adhesiveness (hereinafter, referred to as a minimum activation temperature) is defined as the heat-sensitive adhesive sheet of the heat-sensitive adhesive recording sheet attached to a stainless steel sheet. After contacting the heat stamp heated to a certain temperature from the heat-sensitive recording layer side of the heat-sensitive adhesive recording sheet for 5 seconds, JIS after one day has passed
180 ° adhesive strength according to Z0237 is 300gf / 2
Refers to the lowest temperature of 5 mm or more. When the temperature difference between the minimum color development temperature and the minimum activation temperature is less than 20 ° C, or conversely, the minimum color development temperature is lower, when heating the heat-sensitive adhesive layer to fix the adhesive, It is not preferable because the heat-sensitive recording layer develops color and the background fogs.

The operation of the present invention will be described below. The heat-sensitive adhesive sheet of the first aspect of the present invention, by using a heat-sensitive adhesive layer, can be temporarily fixed and re-attached any number of times because adhesiveness is weak in a normal state, and can be attached. After the position is determined, strong adhesion can be obtained by heating the sheet. The heat-sensitive adhesive recording sheet of the second aspect of the present invention has a heat-sensitive recording layer on one side of the support and a heat-sensitive adhesive layer on the other side, so that heat-sensitive recording is possible and temporary fixing and reattachment are possible. And strong bonding by heating becomes possible.

[0051]

EXAMPLES The present invention will be described in detail below with reference to examples, but the contents of the present invention are not limited to the examples.
All parts and percentages shown below are based on weight. or,
The value indicating the coating amount is the coating amount after drying unless otherwise specified.

Preliminary Operation 1 Preparation of Support A support was prepared by mixing 100 parts of wood pulp consisting of 72 parts of LBKP (freeness of 420 mlcsf) and 28 parts of NBKP (freeness of 440 mlcsf) with light calcium carbonate / heavy carbonic acid. 25 parts of a pigment having a calcium / talc ratio of 32/33/35, 0.12 parts of a commercially available alkyl ketene dimer,
After preparing 0.03 part of a commercially available cationic acrylamide, 1.2 parts of a commercially available cationized starch, and 0.5 part of a sulfuric acid band, papermaking was performed using a Fourdrinier paper machine at a basis weight of 100 g / m ² .

Example 1 Dicyclohexyl phthalate (melting point 64) as a solid plasticizer
C), 2.4 parts by weight of a nonionic surfactant (trade name: Neugen EA-120, manufactured by Daiichi Kogyo Seiyaku Co., Ltd.) as a dispersant and 100 parts of water were uniformly mixed to a concentration of 56% to form a ball mill. To obtain an average particle diameter of 2.0 μm to prepare a solid plasticizer dispersion.

A vinyl acetate-ethylene-acrylate copolymer emulsion (Sumikaflex 910, manufactured by Sumitomo Chemical Co., Ltd .; glass transition temperature: -20 ° C.) was used as a thermoplastic resin in 30 parts of the solid plasticizer dispersion liquid.
0 parts and a rosin ester dispersion (Super Ester E-730, manufactured by Arakawa Chemical Industries, Ltd.) as a tackifier 7
And a dispersion of a heat-sensitive adhesive layer having a solid content of 50% by weight.

This heat-sensitive adhesive layer dispersion was subjected to preliminary operation 1
One side of the support prepared in the above was coated using a wire bar so that the coating amount was 25 g / m ^2, and dried at 40 ° C. for 2 minutes. A commercially available release paper was bonded to the sheet thus obtained to prepare a heat-sensitive adhesive sheet. The minimum activation temperature of this heat-sensitive adhesive sheet was 65 ° C.

Example 2 A nonionic surfactant (trade name: Neugen EA-120, manufactured by Daiichi Kogyo Seiyaku Co., Ltd.) was used as a dispersant in 100 parts of ethylene glycol dibenzoate (melting point: 70 ° C.) as a solid plasticizer. 0.4 parts by weight and water are uniformly mixed to a concentration of 55%
Then, the mixture was pulverized using a ball mill until the average particle diameter became 2.0 μm to prepare a solid plasticizer dispersion liquid.

A vinyl acetate-ethylene-acrylate copolymer emulsion (Sumikaflex 910, manufactured by Sumitomo Chemical Co., Ltd .; glass transition temperature: -20 ° C.) was used as a thermoplastic resin in 30 parts of the solid plasticizer dispersion liquid.
0 parts and a rosin ester dispersion (Super Ester E-730, manufactured by Arakawa Chemical Industries, Ltd.) as a tackifier 7
And a dispersion of a heat-sensitive adhesive layer having a solid content of 50% by weight.

The heat-sensitive adhesive layer dispersion was subjected to preliminary operation 1
One side of the support prepared in the above was coated using a wire bar so that the coating amount was 25 g / m ^2, and dried at 40 ° C. for 2 minutes. The sheet thus obtained was laminated on a commercially available release paper to prepare a heat-sensitive adhesive sheet. The minimum activation temperature of this heat-sensitive adhesive sheet was 70 ° C.

Comparative Example 1 As a thermoplastic resin, a vinyl acetate-ethylene-acrylate copolymer emulsion (Sumikaflex 910, manufactured by Sumitomo Chemical Co., Ltd .; glass transition temperature -20)
) And 100 parts of a rosin ester dispersion as a tackifier (Arakawa Chemical Industries, Ltd., Superester E-7)
30) and 70 parts were mixed to prepare an adhesive coating liquid. This coating solution was applied to one surface of the support prepared in Preparatory Operation 1 using a wire bar so that the coating amount was 25 g / m ^2.
Dry at 0 ° C. for 2 minutes. The sheet thus obtained was bonded to a commercially available release paper to prepare an adhesive sheet.

Comparative Example 2 As a pressure-sensitive adhesive, a heat-sensitive pressure-sensitive adhesive (Heat Magic DW200)
0, manufactured by Toyo Ink Co., Ltd., solid content: 52%) was applied to one side of the support prepared in Preparatory Operation 1 using a wire bar at a coating amount of 2%.
After coating to 5 g / m ² , dry at 40 ° C. for 2 minutes,
A heat-sensitive adhesive sheet was produced. The minimum activation temperature of this heat-sensitive adhesive sheet was measured and found to be 65 ° C.

Comparative Example 3 A heat-sealable adhesive (Aquatex A)
C2010, manufactured by Chuo Rika Kogyo Co., Ltd., solid content: 45%) was applied on one surface of the support prepared in Preparatory Operation 1 using a wire bar so that the coating amount was 10 g / m ² , and then applied at 110 ° C for 2 hours.
After drying for 0 second, a heat-sealable adhesive sheet was prepared.
The minimum activation temperature of this heat-sealable adhesive sheet was 150 ° C.

The sheets obtained in the above Examples and Comparative Examples were evaluated by the following test methods, and the results are shown in Table 1.

<Test Method> Evaluation of removability: After cutting the heat-sensitive adhesive sheet to a width of 25 mm, the release paper was peeled off and attached to a stainless steel plate. 180 degree dynamic peeling strength (300 mm / min) one day after application
Was measured with a Tensilon universal testing machine. Measured value is 10g
When it is in the range of f / 25 mm or more and less than 100 gf / 25 mm, sufficient temporary fixing and re-peeling are possible, so that the re-peelability is good and excellent. If it is 100 gf / 25 mm or more and less than 200 gf / 25 mm, it can be used because it can be peeled off. In the case of 200 gf / 25 mm or more, when the heat-sensitive adhesive sheet temporarily fixed is peeled off, a problem such as curling of the heat-sensitive adhesive sheet occurs. In addition, 10gf /
If it is less than 25 mm, it is temporarily inferior because it cannot be temporarily fixed. However, the unit in Table 1 is gf / 25 mm.

Evaluation of Heat Adhesiveness: After cutting the heat-sensitive adhesive sheet to a width of 25 mm, the release paper was peeled off and affixed to a stainless steel plate, and the heat stamp was heated to the minimum activation temperature of the heat-sensitive adhesive layer. Was brought into contact with the heat-sensitive adhesive sheet for 5 seconds to fix the adhesion. In Comparative Example 1, the temperature of the heat stamp was set to 65 ° C. One day after bonding, the 180-degree dynamic peel strength (300 mm / min) was measured with a Tensilon universal testing machine. Measured value is 500gf / 25mm
If it is above, it is considered that it is sufficiently adhered to the adherend and it is regarded as excellent. 300gf / 25mm or more and 500gf / 25m
If it is less than m, it can be used and is acceptable. 300gf /
When the thickness is less than 25 mm, the heat-sensitive adhesive sheet can be peeled off from the adherend, so that it is inferior. However, the unit in Table 1 is gf / 25 mm.

[0065]

[Table 1]

<Evaluation> As shown in Examples 1 and 2, by using a heat-sensitive adhesive layer for the pressure-sensitive adhesive layer, when it is actually used as a label or the like, it can be temporarily fixed and can be peeled off and heated. As a result, a heat-sensitive adhesive sheet capable of firmly bonding was produced. On the other hand, as shown in Comparative Example 1, when a normal pressure-sensitive adhesive was used for the pressure-sensitive adhesive layer, the adhesive force before heating was too strong, resulting in poor removability, and no increase in the adhesive force due to heating was observed. Was. In addition, as shown in Comparative Examples 2 and 3, when a heat-sensitive adhesive or a heat-sealable adhesive is used for the adhesive layer, there is no adhesiveness before heating, so that the adherend is temporarily fixed. I couldn't do that.

Preliminary Operation 2 Preparation of Intermediate Layer Coating Solution Ansilex (fired kaolin made by Engelhard, oil absorption 80 ml / 100 g according to JIS-K5101 method) 100 parts 10% sodium hexametaphosphate 4 parts 20% MS4600 (manufactured by Nippon Shokuhin Co., Ltd. Acid esterified starch) 30 parts 48% Styrene butadiene copolymer latex 40 parts Water 90 parts were stirred and dispersed to prepare an intermediate layer coating solution with a solid content concentration of 40%.

Preparation of Coating Solution for Heat-Sensitive Recording Layer 1) Preparation of Solution A 35 parts of 3-dibutylamino-6-methyl-7-anilinofluoran (dye) 105 parts of 5% polyvinyl alcohol 105 parts of A solution in Dynomill (Shinmaru Enterprise) (Pulverized to a volume average diameter of 0.5 μm).

2) Preparation of Solution B 2,4′-dihydroxydiphenylsulfone (developer) 50 parts 2-benzyloxynaphthalene (sensitizer) 20 parts 1,1,3-tris- (2-methyl- 4-Hydroxy-5-cyclohexylphenyl) butane 10 parts 5% Polyvinyl alcohol 100 parts 40% zinc stearate emulsion (manufactured by Chukyo Yushi Co., Ltd., Hydurine SZ40) 20 parts The volume of solution B was measured using a Dynomill (manufactured by Shinmaru Enterprises). It was pulverized to an average diameter of 1.1 μm.

3) Preparation of Liquid C 35 parts of light calcium carbonate 3.5 parts of 10% sodium hexametaphosphate 3.5 parts of water 63 parts of liquids A, B, and C were mixed, and 10% of PVA liquid was further solidified to a solid content of 20%. % To give a thermosensitive recording layer coating solution.

Preparation of protective layer coating liquid 10% polyvinyl alcohol 100 parts 40% zinc stearate emulsion (manufactured by Chukyo Yushi Co., Ltd., Hydulin SZ40) 5 parts 20% silicic acid (manufactured by Mizusawa Chemical Co., Ltd., Mizukasil P527) 50 parts A protective layer coating solution was prepared such that the solid content concentration became 10%.

Preparation of Thermal Recording Paper 1 The heat-sensitive recording layer coating liquid prepared in Preparatory Operation 2 was coated on one surface of the support prepared in Preparatory Operation 2 using an air knife coater so that the coating amount was 5 g / m ^2. After drying, a thermosensitive recording layer was provided. The protective layer coating solution prepared in Preparatory Operation 2 was coated on the heat-sensitive recording layer with an air knife coater in an amount of 3 coats.
g / m ² and dried to prepare a thermosensitive recording paper. The minimum color development temperature of this thermosensitive recording paper was 90 ° C. This thermal recording paper is used as thermal recording paper 1
And

Preparation 2 of thermosensitive recording paper Intermediate layer coating liquid prepared in preparatory operation 2 using a blade coater on one side of the support prepared in preparatory operation 2 so that the coating amount would be 8.5 g / m ^2. And dried to form an intermediate layer. The heat-sensitive recording layer coating solution prepared in Preparatory Operation 2 was coated on the intermediate layer using an air knife coater so that the coating amount was 5 g / m ^2, and dried to form a heat-sensitive recording layer. Preliminary operation 2 was performed on the heat-sensitive layer using an air knife coater.
The coating liquid for the protective layer prepared in the above was applied so that the coating amount was 3 g / m ^2, and dried to prepare a thermosensitive recording paper. The minimum color development temperature of this thermosensitive recording paper was measured and found to be 75 ° C.
This thermal recording paper is referred to as thermal recording paper 2.

Example 3 Example 1 was repeated except that the heat-sensitive recording paper 1 was used in place of the support prepared in the preliminary operation 1 and a heat-sensitive adhesive layer was provided on the opposite side of the heat-sensitive recording layer. In the same manner as in the above, a heat-sensitive adhesive recording sheet was obtained. When the minimum activation temperature of the heat-sensitive adhesive recording sheet was measured, the temperature was 65 ° C.
And the temperature difference from the lowest coloring temperature of the heat-sensitive recording layer is 25 ° C.
Met.

Example 4 Example 2 was repeated except that the heat-sensitive recording paper 1 was used in place of the support prepared in the preliminary operation 1 and that the heat-sensitive adhesive layer was provided on the opposite side of the heat-sensitive recording layer. In the same manner as in the above, a heat-sensitive adhesive recording sheet was obtained. When the minimum activation temperature of this heat-sensitive adhesive recording sheet was measured, it was 70 ° C.
And the temperature difference from the lowest coloring temperature of the heat-sensitive recording layer is 20 ° C.
Met.

Example 5 Example 1 was repeated except that the heat-sensitive recording paper 2 was used in place of the support prepared in the preliminary operation 1 and that the heat-sensitive adhesive layer was provided on the opposite side of the heat-sensitive recording layer. In the same manner as in the above, a heat-sensitive adhesive recording sheet was obtained. When the minimum activation temperature of the heat-sensitive adhesive recording sheet was measured, the temperature was 65 ° C.
And the temperature difference from the lowest coloring temperature of the heat-sensitive recording layer is 10 ° C.
Met.

Example 6 Example 2 was repeated except that the heat-sensitive recording paper 2 was used in place of the support prepared in the preparatory operation 1 and a heat-sensitive adhesive layer was provided on the opposite side of the heat-sensitive recording layer. In the same manner as in the above, a heat-sensitive adhesive recording sheet was obtained. When the minimum activation temperature of this heat-sensitive adhesive recording sheet was measured, it was 70 ° C.
And the temperature difference from the minimum color development temperature of the heat-sensitive recording layer was 5 ° C.

Comparative Example 4 In the same manner as in Comparative Example 1, except that the heat-sensitive recording paper 1 was used in place of the support prepared in the preliminary operation 1, and an adhesive layer was provided on the surface opposite to the heat-sensitive recording layer. An adhesive thermosensitive recording sheet was obtained.

Comparative Example 5 In the same manner as in Comparative Example 2, except that the heat-sensitive recording paper 1 was used in place of the support prepared in the preliminary operation 1 and a heat-sensitive adhesive layer was provided on the opposite side of the heat-sensitive recording layer. Thus, a heat-sensitive adhesive heat-sensitive recording sheet was obtained. The minimum activation temperature of the heat-sensitive adhesive heat-sensitive recording sheet was measured to be 65 ° C., and the temperature difference from the minimum color development temperature of the heat-sensitive recording layer was 25 ° C.

The sheets obtained in the above Examples and Comparative Examples were evaluated by the following test methods, and the results are shown in Table 2.

<Test method> Evaluation of removability: heat-sensitive adhesive recording sheet with width 2
After cutting to 5 mm, the release paper was peeled off and attached to a stainless steel plate. One day after application, 180 degree dynamic peel strength (300
mm / min) was measured with a Tensilon universal testing machine. If the measured value is in the range of 10 gf / 25 mm or more and less than 100 gf / 25 mm, sufficient temporary fixing and re-peeling are possible, so that the re-peelability is good and excellent. 100gf / 2
If it is 5 mm or more and less than 200 gf / 25 mm, it can be used because it can be peeled off. In the case of 200 gf / 25 mm or more, when the heat-sensitive adhesive sheet temporarily fixed is peeled off, a problem such as curling of the heat-sensitive adhesive sheet occurs. Also,
If it is less than 10 gf / 25 mm, it cannot be temporarily fixed, so that it is similarly inferior. However, the unit in Table 2 is gf / 25 mm.

Evaluation of Heat Adhesiveness: The heat-sensitive adhesive heat-sensitive recording sheet was cut into a width of 25 mm, and then the release paper was peeled off and attached to a stainless steel plate. The adhesive was fixed by bringing the heat stamp heated to the lowest activation temperature of the heat-sensitive adhesive layer into contact with the heat-sensitive adhesive heat-sensitive recording sheet for 5 seconds. In Comparative Example 4, the temperature of the heat stamp was set to 65.
° C. One day after bonding, 180 degree dynamic peel strength (300 m
m / min) was measured with a Tensilon universal testing machine. If the measured value is 500 gf / 25 mm or more, it is considered to be sufficiently adhered to the adherend, and is regarded as excellent. 300gf / 25mm
If it is less than 500 gf / 25 mm, it can be used. If it is less than 300 gf / 25 mm, the heat-sensitive adhesive sheet can be peeled off from the adherend, so that it is inferior. However, the unit in Table 2 is gf / 25 mm.

Evaluation of the background fog of the heat-sensitive recording layer: The heat-sensitive adhesive / thermosensitive recording layer obtained by the evaluation of the adhesiveness was examined for the coloring of the heat-sensitive recording layer, and evaluated according to the following criteria. A: No color development is observed in the heat-sensitive recording layer. ：: Slight color development is observed in the heat-sensitive recording layer. X: Color development that can be clearly recognized is observed in the heat-sensitive recording layer.

[0084]

[Table 2]

<Evaluation> As shown in Examples 3 to 6, by providing a heat-sensitive recording layer on one side of the support and a heat-sensitive adhesive layer on the other side, heat-sensitive recording is possible and temporary fixing and reattachment are possible. Thus, even if the adhesion was strengthened by heating, a heat-sensitive adhesive recording sheet having no background fog could be produced. In particular, as shown in Examples 3 and 4, the lowest color development temperature of the heat-sensitive recording layer was lower than the lowest activation temperature of the heat-sensitive adhesive layer by 2 times.
When the temperature was higher than 0 ° C., no fog was observed in the heat-sensitive recording layer, and a more excellent heat-sensitive adhesive heat-sensitive recording sheet could be obtained. On the other hand, as shown in Comparative Example 4, when a heat-sensitive recording layer was provided on one side of the support and a normal adhesive layer was provided on the other side, the adhesive strength before heating was too strong, resulting in poor removability.
No increase in adhesive strength due to heating was observed. Also,
As shown in Comparative Example 5, when the heat-sensitive recording layer was provided on one side of the support and the heat-sensitive adhesive layer was provided on the other side, there was no adhesiveness before heating, so that the adherend was temporarily fixed. I couldn't do that.

[0086]

The heat-sensitive adhesive sheet according to the first aspect of the present invention comprises:
By providing a heat-sensitive adhesive layer on one side of the support, tackiness can be temporarily fixed and re-attached any number of times because the adhesiveness is weak under normal conditions. It is possible to obtain a good adhesion. The heat-sensitive adhesive recording sheet of the second aspect of the present invention has a heat-sensitive recording layer on one side of the support and a heat-sensitive adhesive layer on the other side, so that heat-sensitive recording is possible and temporary fixing and reattachment are possible. And strong bonding by heating becomes possible.

Claims (3)

[Claims] 1. A temporary paper having a structure in which a release paper, a heat-sensitive adhesive layer and a support, which have a weak tackiness in a normal state and exhibit strong adhesiveness when heated to a certain temperature or higher, and which are successively laminated, are sequentially laminated. A heat-sensitive adhesive sheet that can be stopped and re-attached and can be firmly bonded by heating. 2. A release paper, in which a heat-sensitive adhesive layer, a support, and a heat-sensitive recording layer, which have weak tackiness in a normal state and exhibit strong adhesiveness when heated to a certain temperature or higher, are sequentially laminated. A heat-sensitive type adhesive heat-sensitive recording sheet which has a heat-sensitive recording structure, can be temporarily fixed and re-attached, and can be strongly bonded by heating. 3. The heat-sensitive adhesive recording sheet according to claim 2, wherein the minimum coloring temperature of the heat-sensitive recording layer is higher than the minimum temperature at which the heat-sensitive adhesive layer exhibits adhesiveness by 20 ° C. or more. A heat-sensitive adhesive recording sheet which is characterized in that: