JPH0939388A - Heat-sensitive recording body - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a heat-sensitive recording body with excellent recording traveling properties and anti-plasticizer properties of a recorded image. SOLUTION: In a heat-sensitive recording body in which a recording layer contg. a colorless or light-colored basic dye and a color developing agent and a protective layer contg. a water-soluble polymer compd. are successively provided on one face of a substrate, 1-15wt.% ethylene-bis-stearamide with a mean particle diameter of 0.1-3μm are incorporated based on the whole solid amt. of the protective layer in the protective layer.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat-sensitive recording material utilizing a color-developing reaction between a colorless or light-colored basic dye and a color-developing agent, and particularly excellent in recording running property and excellent resistance of a recorded image to a plasticizer. The present invention relates to a thermosensitive recording medium.

[0002]

2. Description of the Related Art A thermosensitive recording medium is known in which a coloring image of a colorless or pale leuco dye and a coloring agent is utilized to bring a recording image by bringing both coloring substances into contact with each other by heat. Since such a heat-sensitive recording material is relatively inexpensive, the recording device is compact, and its maintenance is easy, it is used not only as a recording medium for facsimiles and various computers but also in a wide range of fields.

In such a thermosensitive recording medium, an aqueous polymer compound is contained as a main component in the recording layer so that a recorded image easily fades or disappears under the influence of oils and fats and a plasticizer contained in a plastic film. Although a method of providing a protective layer has been proposed, there is a problem in recording runnability due to sticking that occurs between the thermal head and the surface of the protective layer during recording. In order to improve recording runnability, it is preferable to add zinc stearate and waxes as a lubricant in the protective layer, as disclosed in JP-A-60-174685 and JP-A-60-2483.
As described in Japanese Patent Publication No. 89, there is a demand for a thermosensitive recording medium having more excellent recording runnability.

[0004]

SUMMARY OF THE INVENTION An object of the present invention is to provide a thermosensitive recording medium which is less likely to cause fog on the background and which is excellent in recording running property and plasticizer resistance of recorded images.

[0005]

According to the present invention, a recording layer containing a colorless or light basic dye and a coloring agent and a protective layer containing an aqueous polymer compound are sequentially formed on one surface of a support. In the provided thermosensitive recording medium, ethylene bisstearic acid amide having an average particle diameter of 0.1 to 3 μm is contained in the protective layer in an amount of 1 to 15% by weight based on the total solid amount of the protective layer, whereby The issues were resolved and completed.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION As described above, the heat-sensitive recording material of the present invention comprises a protective layer containing an aqueous polymer and containing a specific ethylenebisstearic acid amide having an average particle diameter of 0.1 to 3 μm. 1 to 15 parts by weight based on the total solid content of ethylene bisstearic acid amide. When the average particle diameter of ethylenebisstearic acid amide is less than 0.1 μm, the sticking resistance of the protective layer is remarkably reduced, and when it exceeds 3 μm, it is recorded. Since the image quality deteriorates, the average particle size is 0.2 to 2μ.
The range of m is more preferable. Compared with other lubricants, ethylenebisstearic acid amide has an effect that the background fog is less likely to occur even when the heat-sensitive recording material is exposed to about 80 ° C.

If the specific ethylenebisstearic acid amide is less than 1% by weight based on the total solid content of the protective layer, the sticking resistance of the protective layer is deteriorated, and if it exceeds 15% by weight, dust adheres to the thermal head and the recording image quality is improved. Therefore, the amount of addition is more preferably in the range of 2 to 10% by weight.

In addition, a specific ethylene bis-stearic acid
By including amide in the protective layer, the other side of the support
On the surface (the side of the support on which the recording layer is not provided)
Contains rewetting glue such as alcohol and vinyl acetate
5 to 15 g / m for back side glue layer ²When it is wound up and wound up,
The effect of preventing the protective layer surface and the back adhesive layer surface from sticking is obtained.
You.

Specific examples of the aqueous polymer compound which constitutes the protective layer together with the above specific ethylenebisstearic acid amide include the followings. Polyvinyl alcohol, carboxyl group-modified polyvinyl alcohol, acetoacetyl group-modified polyvinyl alcohol, hydroxyethyl cellulose, methyl cellulose, carboxymethyl cellulose, starch and its derivatives, casein, sodium alginate, polyvinylpyrrolidone, polyacrylamide, styrene-maleic acid copolymer salt, polyurethane Water-soluble polymer compounds such as resin, urea resin, melamine resin, polyamide resin, epichlorohydrinized polyamide resin, and styrene / butadiene copolymer latex, styrene / acrylic ester copolymer latex, polyester polyurethane latex, acrylic acid Water-dispersible polymer compounds such as ester latex.

Of course, these aqueous polymer compounds may be used as a mixture of two or more kinds, if necessary. Incidentally, among these aqueous polymer compounds, especially acetoacetyl group-modified polyvinyl alcohol, by using in combination with a water resistance agent,
It is preferably used because it exhibits more excellent action and effect in the preservability of a recorded image for chemicals such as a plasticizer and oil. The aqueous polymer compound is 25 to 95% by weight, preferably 30 to 70% by weight, based on the total solid content of the protective layer.
It is desirable to adjust within the range.

In addition, a pigment may be added to the protective layer in order to improve printability and writability. Specific examples of such pigments include calcium carbonate, zinc oxide,
Aluminum oxide, titanium dioxide, silicon dioxide, aluminum hydroxide, barium sulfate, talc, kaolin, clay, calcined clay, inorganic pigments such as colloidal silica, styrene microballs, nylon powder, urea filler, formalin resin filler, raw starch granules, etc. And organic pigments.

The amount used is not particularly limited, but it is preferably adjusted within the range of about 5 to 50% by weight based on the total solid amount of the protective layer. Especially, the average particle diameter is 0.5 to 3.0 μm, preferably 0.8 to 2.5.
By including aluminum hydroxide of μm, lees (head residue) may adhere to the thermal head during continuous recording,
It is preferably used because it does not cause sticking and exhibits excellent effects. Further, in the present invention, the UV-encapsulated microcapsules may be contained in the protective layer.

The method for preparing the coating liquid for the protective layer is not particularly limited. Generally, water is used as a dispersion medium, and the specific ethylenebisstearic acid amide, the aqueous polymer compound (adhesive), the pigment and the like are mixed and stirred. And then prepared. Further, a lubricant such as zinc stearate, calcium stearate, carnauba wax, paraffin wax and ester wax can be added to the protective layer coating liquid, if necessary, within a range that does not impair the desired effects of the present invention. In addition, surfactants such as sodium dioctyl sulfosuccinate (as dispersants and wetting agents), curing agents such as glyoxal, boric acid, dialdehyde starch, epoxy compounds, defoaming agents, colored dyes, fluorescent dyes, and various other aids. It is also possible to add agents appropriately.

As the colorless or pale basic dye contained in the recording layer, various known colorless or pale basic dyes can be used, for example, 3,3-bis (p-dimethylaminophenyl) -6-dimethyl. Aminophthalide, 3-
Diethylamino-7-dibenzylaminofluoran, 3
-Cyclohexylamino-6-chlorofluoran, 3-
Diethylamino-6-methyl-7-chlorofluorane,
3,3′-bis (1-n-butyl-2-methylindol-3-yl) phthalide, 3- (N-ethyl-N-isoamyl) amino-6-methyl-7-anilinofluorane, 3- (N-methyl-N-cyclohexyl) amino-
6-methyl-7-anilinofluorane, 3-diethylamino-6-methyl-7-anilinofluorane, 3-di (n-butyl) amino-6-methyl-7-anilinofluorane, 3-diethylamino -7- (o-chlorophenylamino) fluorane, 3-diethylamino-7- (o
-Fluorophenylamino) fluorane, 3- (N-ethyl-p-toluidino) -6-methyl-7-anilinofluorane, 3-diethylamino-6-chloro-7-anilinofluorane, 3-dimethylamino- 6-methyl-7
-Anilinofluorane, 3-diethylamino-6-methyl-7-p-ethoxyanilinofluorane, 3-pyrrolidino-6-methyl-7-anilinofluorane, 3-piperidino-6-methyl-7-ani Reno Fluoran 2,2
-Bis {4- [6 '-(N-cyclohexyl-N-methylamino) -3'-methylspiro [phthalide-3,9']
-Xanthene-2'-ylamino] phenyl} propane, 3-diethylamino-7- (3'-trifluoromethylphenyl) aminofluorane, 3,3-bis [1-
(4-methoxyphenyl) -1- (4-dimethylaminophenyl) ethylene-2-yl] -4,5,6,7-tetrachlorophthalide and the like can be mentioned. Of course, it is not limited to these, and two or more kinds may be used in combination as required.

Various kinds of color formers are known as the color former used in combination with the above basic dye, for example, 4,4'-isopropylidenediphenol, 1,1.
-Bis (4-hydroxyphenyl) cyclohexane,
2,2-bis (4-hydroxyphenyl) -4-methylpentane, 4,4'-dihydroxydiphenyl sulfide, hydroquinone monobenzyl ether, benzyl 4-hydroxybenzoate, 4,4'-dihydroxydiphenyl sulfone, 4-hydroxy -4'-isopropoxydiphenyl sulfone, bis (3-allyl-4-hydroxyphenyl) sulfone, 4-hydroxy-4'-methyldiphenyl sulfone, 4-hydroxyphenyl-4'-benzyloxyphenyl sulfone, 3,4- Dihydroxyphenyl-4'-methylphenyl sulfone, bis (4-
Hydroxyphenylthioethoxy) methane, 1,5-di (4-hydroxyphenylthio) -3-oxapentane, butyl bis (p-hydroxyphenyl) acetate, methyl bis (p-hydroxyphenyl) acetate, 1,1-bis (4-hydroxyphenyl) -1-phenylethane,
1,4-bis [α-methyl-α- (4′-hydroxyphenyl) ethyl] benzene, 1,3-bis [α-methyl-α- (4′-hydroxyphenyl) ethyl] benzene, di (4- Phenolic compounds such as hydroxy-3-methylphenyl) sulfide, 2,2′-thiobis (3-tert-octylphenol) and 2,2′-thiobis (4-tert-octylphenol), N, N′-di-m
-Thiourea compounds such as chlorophenylthiourea, N
-(P-toluenesulfonyl) carbamoyl acid p-cumylphenyl ester, N- (p-toluenesulfonyl)
Carbamoyl acid p-benzyloxyphenyl ester,
N- (o-toluoyl) -p-toluenesulfoamide,
N-(p-toluenesulfonyl) -N '- (p-tolyl) having a -SO ₂ NH- bond in the molecule, such as urea, 4- [2-(p-methoxyphenoxy) ethyloxy] zinc salicylate, 4 Zinc- [3- (p-tolylsulfonyl) propyloxy] salicylate, 5- [p- (2
-P-methoxyphenoxyethoxy) cumyl] zinc salicylate.

The use ratio of the basic dye and the color developing agent is appropriately selected according to the type of the basic dye or the color developing agent to be used and is not particularly limited, but the basic dye 1 is generally used. 1-5 parts by weight, preferably 2-3
About a part by weight of the coloring agent is used.

Further, a sensitizer may be used in combination in the recording layer in order to enhance recording sensitivity. Specific examples of such a sensitizer include stearic acid amide, methylenebisstearic acid amide and terephthalic acid. Dibenzyl, benzyl p-benzyloxybenzoate, 1-hydroxy-2-
Phenyl naphthoate, 2-naphthyl benzyl ether,
m-terphenyl, dibenzyl oxalate, di-oxalate
p-chlorobenzyl ester, oxalic acid di-p-methylbenzyl ester, p-benzylbiphenyl, p-tolylbiphenyl ether, 1,2-di (3-methylphenoxy) ethane, 1,2-di (4-methylphenoxy) ) Ethane, 1,2-di (4-methoxyphenoxy) ethane,
1,2-diphenoxyethane, 1- (4-methoxyphenoxy) -2- (3-methylphenoxy) ethane, N-
Acetoacetyl-p-toluidine, di (β-biphenylethoxy) benzene, p-di (vinyloxyethoxy)
Examples are benzene and 1-isopropylphenyl-2-phenylethane.

In order to improve the storability of recorded images with time,
It is also possible to add a storage stability improving agent, and examples of such storage stability improving agent include 2,2'-methylenebis (4-methyl-6-tert-butylphenol) and 2,2'-methylenebis (4-ethyl-). 6-tert-butylphenol), 2,2'-ethylidenebis (4,6-di-tert-
Butylphenol), 4,4'-thiobis (2-methyl-6-tert-butylphenol), 4,4'-butylidenebis (6-tert-butyl-m-cresol), 1-
[Α-Methyl-α- (4′-hydroxyphenyl) ethyl] -4- [α ′, α′-bis (4 ″ -hydroxyphenyl) ethyl] benzene, 1,1,3-tris (2-methyl-) 4-hydroxy-5-cyclohexylphenyl)
Butane, 1,1,3-tris (2-methyl-4-hydroxy-5-tert-butylphenyl) butane, 4,4′-
Thiobis (3-methylphenol), 2,2-bis (4
-Hydroxy-3,5-dibromophenyl) propane,
2,2-bis (4-hydroxy-3,5-dichlorophenyl) propane, 2,2-bis (4-hydroxy-3,
Hindered phenol compounds such as 5-dimethylphenyl) propane, 1,4-diglycidyloxybenzene,
4,4'-diglycidyloxydiphenyl sulfone, 4
-Benzyloxy-4 '-(2-methylglycidyloxy) diphenylsulfone, diglycidyl terephthalate,
Epoxy compounds such as cresol novolac type epoxy resin, phenol novolac type epoxy resin, and bisphenol A type epoxy resin, N, N'-di-2-naphthyl-p-phenylenediamine, 2,2'-methylenebis (4,6-di) Sodium or polyvalent metal salts of -tert-butylphenyl) phosphate, bis (4-ethyleneiminocarbonylaminophenyl) methane and the like can be mentioned. Among them, 1,1,3-tris (2-methyl-4-hydroxy-5-cyclohexylphenyl) butane is preferably used because it has an excellent effect on water resistance and does not easily cause background fog.

The coating liquid for the recording layer containing these substances generally uses water as a dispersion medium and is mixed with a stirring / grinding machine such as a ball mill, an attritor, or a sand mill to obtain dyes, colorants, sensitizers, storability improvers, etc. Are dispersed together or separately.

In the coating liquid for the recording layer, starch, hydroxyethyl cellulose, methyl cellulose, carboxymethyl cellulose, gelatin, casein, gum arabic, polyvinyl alcohol, carboxy-modified polyvinyl alcohol, acetoacetyl group-modified polyvinyl alcohol, silicon are usually used as adhesives. Modified polyvinyl alcohol, diisobutylene / maleic anhydride copolymer salt, styrene /
Maleic anhydride copolymer salt, ethylene / acrylic acid copolymer salt, styrene / acrylic acid copolymer salt, styrene /
At least one kind of butadiene copolymer emulsion, urea resin, melamine resin, amide resin, polyurethane resin and the like is blended in the range of about 5 to 30% by weight based on the total solid amount of the recording layer.

If desired, various auxiliary agents can be added to the coating liquid for the recording layer. For example, sodium dioctyl sulfosuccinate, sodium dodecylbenzene sulfonate, sodium lauryl alcohol sulfate,
Dispersants such as fatty acid metal salts, waxes such as zinc stearate, calcium stearate, polyethylene wax, carnauba wax, paraffin wax and ester wax, defoaming agents, coloring dyes and pigments, etc. are appropriately added.

Examples of the pigment include kaolin, clay,
Inorganic pigments such as calcium carbonate, aluminum hydroxide, calcined clay, calcined kaolin, titanium oxide, diatomaceous earth, fine anhydrous silica, activated clay, styrene microballs, nylon powder, polyethylene powder, urea
Examples include formalin resin fillers and organic pigments such as raw starch particles.

The method for forming the recording layer and the protective layer is not particularly limited, and suitable coating such as air knife coating, varibar blade coating, pure blade coating, rod blade coating, short dwell coating, curtain coating, die coating, etc. The coating liquid for recording layer is applied and dried on the support by a method, and then the coating liquid for protective layer is applied and dried on the recording layer. The support may be appropriately selected from paper, plastic film, synthetic paper, non-woven fabric, metal vapor deposition and the like. Further, the coating amount of the coating liquid for the recording layer is 2 to 12 in dry weight.
g / m ^2, is preferably adjusted 3 to 10 g / m ² approximately, the coating amount of the protective layer coating composition is 0.5 to 10 g / m ² by dry weight, preferably 2 to 6 g / m ² range of about It

If desired, a protective layer may be provided on the back surface side of the thermosensitive recording medium to further enhance the storage stability and impart a strong gloss. Furthermore, an undercoat layer may be provided on the support, smoothing treatment such as super calendering may be applied after each layer is smeared, or an adhesive label may be applied to the back surface of the recording material to form an adhesive label, magnetic recording layer or printing. Various known techniques in the field of producing a heat-sensitive recording material such as a coating layer for coating and a thermal transfer recording layer may be added as necessary.

[0025]

The present invention will be described in more detail with reference to the following examples, but the present invention is not limited to these examples. In addition, unless otherwise indicated, the part and% in an example show a weight part and weight%, respectively.

Example 1 Preparation of solution A 3-di (n-butyl) amino-6-methyl-7-anilinofluorane 10 parts, 1,2-di (3-methylphenoxy) ethane 20 parts, 5 parts of methylcellulose % Aqueous solution 5 parts and water 40 parts were pulverized with a sand mill until the average particle size became 2 μm.

Preparation of Solution B A composition consisting of 30 parts of 4-hydroxy-4′-isopropoxydiphenyl sulfone, 5 parts of a 5% aqueous solution of methylcellulose and 80 parts of water was used in a sand mill to give an average particle diameter of 2
It was pulverized to a size of μm.

Solution C Preparation 1,1,3-Tris (2-methyl-4-hydroxy-5)
A composition consisting of 30 parts of -cyclohexylphenyl) butane, 5 parts of a 5% aqueous solution of methylcellulose, and 55 parts of water was pulverized with a sand mill until the average particle size became 1 µm.

Formation of Recording Layer 75 parts of solution A, 115 parts of solution B, 20 parts of solution C, 100 parts of 10% aqueous solution of polyvinyl alcohol, 4 parts of glyoxal
3 0% aqueous solution and the mixture stirred to obtained coating liquid aluminum hydroxide 4 parts, coating amount after drying on one surface of woodfree paper of 44 g / m ² is applied and dried such that the 5 g / m ² To form a recording layer. Formation of protective layer 195 parts of 10% aqueous solution of polyvinyl alcohol modified with acetoacetyl group, 40 parts of aluminum hydroxide having an average particle diameter of 1.0 μm, kaolin [trade name: UW-90, manufactured by EMC] 10 parts, average particle diameter is 28 parts of 0.4 μm ethylene bisstearic acid amide dispersion [trade name: Himicron G-110] 17 parts, concentration of 30% waterproofing agent [trade name: PA-800, manufactured by Japan PMC] 0.7 Parts of water and 100 parts of water are mixed and stirred to form a protective layer by coating and drying a coating solution for protective layer on the recording layer so that the coating amount after drying is 4 g / m ^2. After that, a super calender process was performed to obtain a thermosensitive recording medium.

Example 2 A thermosensitive recording medium was obtained in the same manner as in Example 1 except that 40 parts of kaolin was used instead of 40 parts of aluminum hydroxide in the formation of the protective layer of Example 1.

Example 3 In the formation of the protective layer of Example 1, the average particle size was 0.4.
μm ethylenebisstearic acid amide 28% dispersion 1
A thermosensitive recording medium was obtained in the same manner as in Example 1 except that 7 parts was changed to 5 parts.

Example 4 In the formation of the protective layer of Example 1, the average particle size was 0.4.
μm ethylenebisstearic acid amide 28% dispersion 1
Except that instead of 7 parts, 17 parts of an ethylenebisstearic amide 28% dispersion having an average particle size of 3 μm was used,
A thermosensitive recording medium was obtained in the same manner as in Example 1.

Example 5 In the formation of the protective layer of Example 1, the average particle size was 0.4.
μm ethylenebisstearic acid amide 28% dispersion 1
A thermosensitive recording medium was obtained in the same manner as in Example 1 except that 7 parts was changed to 29 parts.

Example 6 Partially saponified polyvinyl alcohol [trade name: PV] as a rewetting paste was formed on the back surface of the heat-sensitive recording material obtained in Example 1.
A205, manufactured by Kuraray Co., Ltd.] was applied and dried so that the coating amount after drying was 8 g / m ^2, and a back side adhesive layer was provided.

Comparative Examples 1 to 3 In forming the protective layer of Example 1, the average particle size was 1 μm.
Of ethylene bis-stearamide 28% dispersion of 17
Instead of 12 parts, 12 parts of a 40% stearic acid amide dispersion liquid having an average particle diameter of 1 μm (Comparative Example 1) and an average particle diameter of 2
12 parts of 40% dispersion of paraffin wax 40 μm (Comparative Example 2), 3 parts of zinc steariphosphate having an average particle size of 3 μm
A thermal recording paper having three types of protective layers was obtained in the same manner as in Example 1 except that 17 parts of 0% dispersion liquid (Comparative Example 3) was used.

Comparative Example 4 In the formation of the protective layer of Example 1, the average particle size was 0.4.
In the same manner as in Example 1 except that 17 parts of the ethylenebisstearic acid amide 28% dispersion having a particle diameter of 0.1 μm was used instead of 17 parts of the ethylenebisstearic acid amide 28% dispersion. A thermosensitive recording medium was obtained.

Comparative Example 5 In the formation of the protective layer of Example 1, the average particle size was 0.4.
Heat sensitivity was the same as in Example 1 except that 17 parts of ethylenebisstearic acid amide 28% dispersion having a mean particle size of 6 μm was used in place of 17 parts of ethylenebisstearic acid amide 28% dispersion. I got a record.

Comparative Example 6 In forming the protective layer of Example 1, the average particle size was 0.4.
μm ethylenebisstearic acid amide 28% dispersion 1
A thermosensitive recording medium was obtained in the same manner as in Example 1 except that 7 parts were used as 1 part.

Comparative Example 7 In the formation of the protective layer of Example 1, the average particle size was 0.4.
μm ethylenebisstearic acid amide 28% dispersion 1
A thermosensitive recording medium was obtained in the same manner as in Example 1 except that 7 parts was changed to 43 parts.

COMPARATIVE EXAMPLE 8 Partially saponified polyvinyl alcohol [trade name: PV] as a rewetting paste was formed on the back surface of the thermosensitive recording medium obtained in Comparative Example 1.
A205, manufactured by Kuraray Co., Ltd.] was applied and dried so that the coating amount after drying was 8 g / m ^2, and a back side adhesive layer was provided.

The thermal recording material thus obtained was subjected to the following evaluation tests, and the results are shown in Table 1. [Coloring property] Using a heat-sensitive evaluation machine [trade name: TH-PMD, manufactured by Okura Electric Co., Ltd.], each heat-sensitive recording material is caused to develop color with an applied energy of 0.50 mJ / dot, and the color density of the obtained recorded image is determined by the Macbeth density. The measurement was performed in a visual mode with a total [RD-914 type, manufactured by Macbeth Co.].

[Recording Image Quality] The image quality of the recorded image obtained in the above [coloring property] was visually evaluated as follows. ⊚: The recording image quality is extremely uniform. ◯: The recording image quality is slightly uneven. X: There are many white spots in the recorded image quality and the image quality is not uniform.

[Background fog] The color density and background density after leaving the thermosensitive recording medium after recording at the above [coloring property] at 80 ° C. for 24 hours are Macbeth densitometer (visual mode).
Then, the background fog was evaluated.

[Sticking resistance (recording running property)] Images were recorded by an aviation tag auto-labeler (trade name: Model 201, manufactured by UBI), and the occurrence of sticking was evaluated as follows. ⊚: There is no sticking and recording is possible without problems. ◯: Sticking occurs slightly, but recording is possible without problems. Poor: Sticking occurred remarkably, and recording failure occurred.

[Plasticizer resistance] polypropylene pipe (4
A vinyl chloride wrap film (made by Mitsui Toatsu Co., Ltd.) is wound three times on a 0 mm Φ tube, and each heat-sensitive recording material with print coloring is sandwiched so that the print coloring surface is on the outside. Wrap the vinyl chloride wrap film in five layers,
The print density after standing for 48 hours at 30 ° C. at a point of 0.45 mj / dot was measured with a Macbeth densitometer (visual mode), and the density maintenance rate was calculated. (The higher the number,
Good plasticizer resistance. )

[Blocking resistance] The thermosensitive recording media obtained in Example 6 and Comparative Example 8 were wound (width 210 mm, length 50 m) under conditions of 50 ° C. and 80% RH for 24 hours and then wound. After taking off, the degree of sticking (blocking resistance) between the protective layer surface and the back adhesive layer surface was visually determined as follows. ◯: There is no sticking between the protective layer surface and the back adhesive layer surface. X: The protective layer surface was peeled off due to the adhesion between the protective layer surface and the back adhesive layer surface.

[0047]

[Table 1]

[0048]

As is clear from the results shown in Table 1, the thermosensitive recording medium of the present invention has excellent recording running properties and excellent plasticizer resistance of recorded images.

Claims (3)

[Claims] 1. A thermosensitive recording medium comprising a support and a recording layer containing a colorless or light-colored basic dye and a coloring agent and a protective layer containing an aqueous polymer compound, which are sequentially provided on one surface of the support. A heat-sensitive recording material comprising ethylene bisstearic acid amide having an average particle diameter of 0.1 to 3 μm in an amount of 1 to 15% by weight based on the total solid amount of the protective layer. 2. The protective layer has an average particle size of 0.5 to 3 μm.
5 to 5% of aluminum hydroxide based on the total solid content of the protective layer
The thermal recording material according to claim 1, wherein the thermal recording material contains 50% by weight. 3. The heat-sensitive recording material according to claim 1 or 2, wherein a backside adhesive layer containing a rewetting adhesive as a main component is provided on the other surface of the support.