JP2014168905A - Recording sheet - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a recording sheet of a thermosensitive style such as a thermal transfer reception sheet, thermosensitive recording sheet, etc. for executing recordings by using thermal heads, more specifically, a recording sheet of a thermosensitive style accompanied by a scarce coating material foamability, yielding a high image density, excellent in terms of image homogeneity, unaccompanied by sticking, and excellent in terms of printing runnability.SOLUTION: The provided recording sheet is a recording sheet of a thermosensitive style obtained by laminating, in proper order on at least one surface of a sheet-shaped substrate, a heat insulating layer including hollow particles and a recording layer for thermal transfer reception or thermosensitive recording where the recording layer includes a silicone-based polymer.

Description

  The present invention relates to a thermal recording sheet such as a thermal transfer receiving sheet and a thermal recording sheet that perform recording using a thermal head. More specifically, the present invention relates to a low foaming property of a paint, a high image density, and an image uniformity. The present invention relates to a heat-sensitive recording sheet that is excellent and has no sticking and excellent print running properties.

The thermal recording material is a thermal recording sheet provided with a thermal recording layer that develops color by heat on the surface of the support, and an ink ribbon (thermal transfer sheet) that has a receiving layer on the surface of the support and retains coloring components. Thermal transfer receptive sheets that are used in combination with the heat transfer sheet to transfer colored components to the receptive layer by heat are known and put into practical use.
In recent years, among thermal printers, dye thermal transfer printers capable of printing clear full-color images have attracted attention. The dye thermal transfer printer is a superposition of the dye layer containing the dye on the dye thermal transfer sheet and the thermal transfer receiving layer containing the dye dyeable resin on the thermal transfer receiving sheet. The dye is transferred onto the thermal transfer receiving layer by a predetermined concentration to form an image. The dye thermal transfer sheet has a dye layer of three colors of yellow, magenta and cyan, or four colors obtained by adding black to this. A full-color image is obtained by repeatedly transferring the dyes of each color of the dye thermal transfer sheet sequentially to the thermal transfer receiving sheet.
With the development of digital image processing technology by computers, the quality of recorded images has been remarkably improved. In addition, with the improvement of the thermal head temperature control technology, the printing system has been speeded up, and the system has been installed and used outdoors in sightseeing spots, and the thermal transfer system is expanding its market.

Patent Document 1 discloses a thermal transfer receiving sheet that includes a specific urethane resin and a release agent on a heat insulating layer, and a receiving layer using a fluorine-based compound as the release agent (Patent Document 1). ).

JP 2010-269583 A

However, when printing outdoors using the above system, the thermal transfer sheet may be difficult to move at a constant speed. In addition, when the thermal transfer sheet is peeled off from the thermal transfer receiving sheet after printing, peeling noise may be generated and peeling lines may be generated in the image. Such linear printing unevenness and peeling lines are called sticking. When sticking occurs, image quality may be impaired.
In particular, sticking is likely to occur under low-temperature printing environment conditions in winter, and further, the image uniformity may be deteriorated due to white spots (dot missing) in the image, which may impair image quality.
Also, under the printing environment conditions at high temperatures in the summer, when the thermal transfer sheet is peeled off from the thermal transfer receiving sheet after printing, the peeling sound becomes loud or, in some cases, the thermal transfer sheet is not sufficient due to insufficient releasability. May be partly fused, which may impair image quality.
On the other hand, there is also a need for a thermal recording sheet that has a high image density, excellent image uniformity, no sticking, and excellent print running properties.

The thermal transfer receiving layer or the heat-sensitive recording layer is applied using various types of coaters. When the foaming of the coating liquid is large at the time of coating, there is a problem that repelling or streaks due to bubbles occur on the coated surface and productivity is lowered.
In particular, in the case of high-speed coating, the foaming of the coating liquid tends to increase, and a low-foaming coating liquid is required for improving the productivity by high-speed coating.
There is a demand for a recording sheet that is excellent in image quality and printing runnability without any problem in operability.

  The present invention improves the above-mentioned problems of the prior art, and provides a thermal recording sheet having a low paint foaming property, a high image density, excellent image uniformity, no sticking, and excellent print runnability. It is what.

As a result of diligent research to solve such problems, the present inventors have made a heat-sensitive recording sheet in which a heat insulating layer containing hollow particles and a recording layer for thermal transfer reception or thermal recording are sequentially laminated. The inventors have found that the problem can be solved by including a silicon-based polymer in the recording layer, and have reached the present invention. That is, the present invention includes the following inventions.
(1) In a thermal recording sheet in which a heat insulating layer containing hollow particles and a thermal transfer receiving recording layer or a thermal recording recording layer are sequentially laminated on at least one surface of a sheet-like substrate, a silicon-based recording layer is used. A recording sheet comprising a polymer.
(2) The recording sheet according to (1), wherein the silicon-based polymer of the recording layer is polyether-modified polydimethylsiloxane.
(3) The recording sheet according to (1) or (2), wherein the polyether-modified polydimethylsiloxane of the recording layer is represented by the following general formula (1).

（一般式（１）において、Ｘ、Ｙおよびａ、ｂ、ｍは正の整数を表す。Ｒは、水素原子、アルキル基を表す。）
（４）前記記録層にシリコン系界面活性剤を含有する（１）〜（３）のいずれかに記載の記録シート。
（５）前記記録層の全固形分１００質量部に対し、シリコン系界面活性剤を０．３〜５質量部含有する（４）に記載の記録シート。
（６）前記記録層の全固形分１００質量部に対し、シリコン系ポリマーを０．３〜２０質量部含有する請求項（１）〜（５）のいずれかに記載の記録シート。

(In general formula (1), X, Y and a, b, and m represent positive integers. R represents a hydrogen atom or an alkyl group.)
(4) The recording sheet according to any one of (1) to (3), wherein the recording layer contains a silicon-based surfactant.
(5) The recording sheet according to (4), containing 0.3 to 5 parts by mass of a silicon-based surfactant with respect to 100 parts by mass of the total solid content of the recording layer.
(6) The recording sheet according to any one of claims (1) to (5), containing 0.3 to 20 parts by mass of a silicon-based polymer with respect to 100 parts by mass of the total solid content of the recording layer.

  According to the present invention, it is possible to obtain a heat-sensitive recording sheet having a low paint foaming property, a high image density, excellent image uniformity, no sticking and excellent print runnability.

  The heat-sensitive recording sheet of the present invention has a structure in which a heat insulating layer and a recording layer (thermal transfer receiving layer or heat-sensitive recording layer) are sequentially laminated on at least one surface of a sheet-like substrate. It is of course possible to improve the performance by providing other layers. These layers will be described in detail below.

(Sheet substrate)
As the sheet-like substrate, papers and synthetic resin sheets mainly composed of cellulose pulp are used. Examples of paper include high-quality paper (acidic paper, neutral paper), medium-quality paper, coated paper, art paper, glassine paper, and resin-laminated paper.
Examples of the sheet mainly composed of a synthetic resin include polyolefins such as polyethylene and polypropylene, polyesters such as polyethylene terephthalate, polyamide, polyvinyl chloride, polystyrene, polycarbonate, and polyvinyl chloride.
Examples of the porous stretched sheets include, for example, synthetic paper, porous polyester sheet and the like mainly composed of a thermoplastic resin such as polyolefin and polyester. These materials may be used alone, or may be a laminate sheet obtained by laminating and adhering porous stretched sheets, porous stretched sheets, and other sheets and / or papers.

In addition, the sheet-like substrate may have a configuration in which a first substrate layer on which a recording layer is formed, an adhesive layer, a release agent layer, and a second substrate layer are sequentially laminated. Of course, a sheet-like substrate having a structure of (also referred to as a seal type) can be used.
Among the sheet-like base materials, papers mainly composed of cellulose pulp are preferable. For example, the texture of the thermal transfer receiving sheet is close to that of photographic paper, and the cost is low and the environmental load is small.

(Insulation layer)
The heat insulating layer is formed on at least one surface of the sheet-like substrate, and the heat insulating layer can be formed by applying and drying a coating liquid containing hollow particles and an adhesive component. An undercoat layer can also be formed between the sheet-like substrate and the heat insulating layer. The undercoat layer prevents the coating solution for the heat insulating layer from penetrating too much into the sheet-like base material and improves the adhesion between the sheet-like base material and the heat-insulating layer. A barrier layer for preventing transition from the back surface to the recording surface, a colored layer for adjusting the color tone of the recording surface, and the like can be appropriately employed.

(Hollow particles)
Examples of the hollow particles include known materials such as expandable hollow particles and hollow emulsions.
The expandable hollow particles are, for example, acrylonitrile, methacrylonitrile, methyl methacrylate, styrene, vinylidene chloride, vinyl chloride, etc. with a low boiling point hydrocarbon such as n-butane, i-butane, pentane, neopentane, etc. as the core. Monomer homopolymer resins or these copolymer resins are used as walls (shells) to form microcapsules, and low boiling point hydrocarbons are vaporized and expanded by heating to form spaces inside the particles.
A hollow emulsion uses a polymer-forming material as a shell-forming material and a volatile liquid as a pore-forming material, and volatilizes the pore-forming material from microcapsules produced by a microcapsule polymerization method. It is the microcapsule-like hollow particle obtained by making it.

  The volumetric hollow ratio of the hollow particles used in the heat insulating layer is not particularly limited, but is preferably 45 to 97%, and more preferably 50 to 90%. When the volumetric hollow ratio of the hollow particles is 45% or more, the heat insulating property is excellent, and a sufficient image density is easily obtained. Further, when the volume hollowness is 97% or less, the shell thickness of the hollow particles becomes thin, and the hollow particles can be prevented from being easily crushed. When handling, for example, by external pressure or heat at the time of recording , Scratches and dents are difficult to handle and easy to handle.

The volume hollowness of the hollow particles indicates the ratio of the volume of the hollow part to the volume of the particles. The volume hollowness ratio of the foamable hollow particles and the hollow emulsion is calculated, for example, from the enlarged image obtained by an electron microscope, and the volume of the hollow portion and the entire volume of the hollow particle are calculated, and (volume of the hollow portion) / (volume of the entire hollow particle). ).
However, when the volumetric hollowness of the hollow particles is high and easily deformed during cross-section sample preparation, or when the shape of the hollow particles is not constant, it is difficult to determine the volumetric hollowness from the enlarged image by the electron microscope. There is. In such a case, the volume hollow ratio of the expandable hollow particles is such that the specific gravity of the hollow particle dispersion composed of hollow particles and a poor solvent, the mass fraction of the hollow particles in the dispersion, and the shell (wall) of the hollow particles are formed. It can obtain | require from the specific gravity of the polymer resin to perform, and the specific gravity of a poor solvent. The poor solvent is a solvent that does not dissolve and / or swell the resin that forms the walls of the hollow particles, and examples thereof include water and isopropyl alcohol.

  The average particle diameter of the hollow particles constituting the heat insulating layer is preferably 0.1 to 20 μm, more preferably 0.3 to 18 μm. For example, in the case of using expandable hollow particles, a method of preparing a heat-insulating layer by preparing a coating solution containing previously foamed particles and applying and drying, and a coating solution containing unfoamed particles Any of the methods such as a method of heating and foaming the particles to form a heat insulating layer after coating may be used, but the foamed particles in advance in terms of uniformity and smoothness of the surface of the heat insulating layer to be obtained The method of forming a heat insulation layer using is a more preferable embodiment. When the average particle diameter of the hollow particles after foaming is 20 μm or less in the heat insulating layer, the surface of the heat insulating layer is excellent in smoothness and high-quality recording can be performed. On the other hand, when the average particle diameter of the hollow particles after foaming is 0.1 μm or more, sufficient heat insulation can be obtained, and recording with high image density can be performed.

When the hollow particles having different particle diameters are used in combination in the heat insulating layer, the hollow particles having a small particle diameter are filled between the hollow particles having a large particle diameter, or the unevenness of the surface is reduced. Since it improves, it is preferable.
The average particle diameter of the hollow particles of the present invention is a value measured using, for example, a laser diffraction particle size distribution meter (trade name: SALD2000, manufactured by Shimadzu Corporation, volume distribution 50% median diameter).

  Moreover, as a material constituting the heat insulating layer, a crosslinking agent, various inorganic and organic pigments, waxes, metal soaps, and the like can be used, and further, an ultraviolet absorber, a fluorescent dye, an oil repellent, an antifoaming agent, a viscosity as necessary. Various additives such as a regulator can be used as long as the desired effects are not impaired.

The coating amount as the solid content of the heat-insulating layer is preferably 1 to 50 g / ^{m 2,} more preferably from 5 to 25 g / ^{m 2.} Sufficient heat insulation and cushioning properties can be obtained when the solid content coating amount of the heat insulation layer is 1 g / m ² or more. In addition, when the amount of solid content coating exceeds 50 g / m < ² >, the heat insulation and cushioning effects are saturated, which is economically undesirable. In addition, after forming a heat insulation layer, a calendar process can be given and surface smoothness can also be improved.

  By providing a recording layer (thermal transfer receiving layer or thermosensitive recording layer) on the heat insulating layer containing the hollow particles and the adhesive component, a recording material is obtained. A recording material having a heat insulating layer containing hollow particles has a heat insulating property and a cushioning property when performing a heat sensitive recording, and can provide a recording with high sensitivity and high image quality.

(Thermal transfer receiving layer)
In the case of a thermal transfer receiving sheet, a thermal transfer receiving layer is provided on the heat insulating layer. The thermal transfer receiving layer formed by the production method of the present invention is formed by applying and drying a coating liquid containing a resin, a crosslinking agent, and a silicon-based polymer.

As the resin for forming the thermal transfer receiving layer, a resin having a high affinity for the dye transferred from the ink ribbon and thus having a good dyeing property is used. Examples of such dye dyeing resins include polyurethane resins, polyester resins, polycarbonate resins, polyvinyl chloride resins, polyvinyl chloride / vinyl acetate copolymer resins, polyvinyl chloride / acrylic copolymer resins, polyvinyl acetal resins, Examples thereof include polyvinyl butyral resins, polystyrene resins, polyacrylate resins, cellulose derivative resins such as cellulose acetate butyrate, thermoplastic resins such as polyamide resins, and active energy ray curable resins. These resins preferably have a functional group (for example, a functional group such as a hydroxyl group, an amino group, a carboxyl group, and an epoxy group) that is reactive with the crosslinking agent used.

  The thermal transfer receiving layer mainly composed of a reaction product of a dye dyeable resin and a crosslinking agent as a main component has a problem that the image density is likely to vary depending on the progress of the crosslinking reaction. In particular, with an isocyanate-based crosslinking agent, the crosslinking density changes depending on the amount of water in the thermal transfer receiving layer, and the image density of the thermal transfer receiving sheet is likely to change.

  The thermal transfer receiving layer formed mainly of a crosslinking reaction product of a dye-dyeable resin having a carboxyl group and at least one selected from a carbodiimide-based crosslinking agent or an oxazoline-based crosslinking agent has a crosslinking reaction in the thermal transfer receiving layer. It is preferable that a reaction product having a constant crosslink density is obtained without being easily affected by the moisture of the water, and that the image density of the thermal transfer receiving sheet can be easily kept within a certain range. Examples of commercially available dye-dyeable resins having a carboxyl group include Neo Sticker # 1200 (manufactured by Nikka Chemical, urethane-based resin), Vin Blanc 603 (manufactured by Nissin Chemical, vinyl chloride / vinyl acetate copolymer resin), Vin Blan 690 (manufactured by Nisshin Chemical Co., Ltd., vinyl chloride / acrylic copolymer resin), FK-555 (manufactured by Chuo Rika Kogyo Co., Ltd., acrylic resin), and the like. ), As the oxazoline-based crosslinking agent, NK assist OX (manufactured by Nikka Chemical) may be mentioned.

(Silicon polymer)
The thermal transfer receiving layer contains a silicon-based polymer. The silicon-based polymer used in the present invention has a main chain having a siloxane structure. The silicon-based polymer has a role of a release agent for facilitating peeling from the ink ribbon. However, according to the research of the present inventors, the silicon-based polymer is further oriented on the surface of the thermal transfer receiving layer, and the surface smoothness is further improved. It has the effect of improving the property. Moreover, a low-foaming coating liquid can be obtained. Examples of the silicon-based polymer include polydimethylsiloxane, polymethylphenylsiloxane, straight silicon oil of polymethylhydrogensiloxane, and modified polydimethylsiloxane in which organic groups are introduced into the side chain and terminal of polydimethylsiloxane. Examples of the modified polydimethylsiloxane include alkyl modified polydimethylsiloxane, aralkyl modified polydimethylsiloxane, polyester modified polydimethylsiloxane, polyether modified polydimethylsiloxane, fluoroalkyl modified polydimethylsiloxane, fatty acid ester modified polydimethylsiloxane, and fatty acid amide modified poly. Dimethylsiloxane, amino-modified polydimethylsiloxane, epoxy-modified polydimethylsiloxane, carbinol-modified polydimethylsiloxane, mercapto-modified polydimethylsiloxane, carboxy-modified polydimethylsiloxane, methacryl-modified polydimethylsiloxane, phenol-modified polydimethylsiloxane, silanol-modified polydimethyl Examples thereof include siloxane and diol-modified polydimethylsiloxane.

(Polyether-modified polydimethylsiloxane)
The silicon-based polymer is preferably polyether-modified polydimethylsiloxane. Introducing polyether groups is effective in improving lubricity. Therefore, it becomes possible to further improve sticking and releasability.

  The polyether-modified polydimethylsiloxane is preferably a polyether-modified polydimethylsiloxane represented by the following general formula (1).

（一般式（１）において、Ｘ、Ｙおよびａ、ｂ、ｍは正の整数を表す。Ｒは、水素原子、アルキル基を表す。）
エチレンオキシド（ＥＯ）とプロピレンオキシド（ＰＯ）の共重合からなるポリエーテル基を導入することにより、更にスティッキング、離型性を向上させることが可能となる。また、主鎖であるシロキサンが熱転写受容層表面に配向し易くなり、表面平滑性を向上させる効果を有するため、より均一な熱転写受容層を形成することができ、画質を更に向上させることができる。

(In general formula (1), X, Y and a, b, and m represent positive integers. R represents a hydrogen atom or an alkyl group.)
By introducing a polyether group comprising a copolymer of ethylene oxide (EO) and propylene oxide (PO), sticking and releasability can be further improved. In addition, since the main chain siloxane is easily oriented on the surface of the thermal transfer receiving layer and has an effect of improving the surface smoothness, a more uniform thermal transfer receiving layer can be formed, and the image quality can be further improved. .

  Specific examples of the silicon-based polymer used in the present invention include polyether-modified polydimethylsiloxanes BYK-307, BYK-333, BYK-342, BYK-378 (above BYK-Chemie), TSF4440, TSF4452, TSF4460 (or more). Momentive Performance Materials), polyester-modified polydimethylsiloxanes BYK-310, BYK-313 (above BYK Chemie), aralkyl-modified polydimethylsiloxanes BYK-322, BYK-323 (above BYK Chemie) and the like. Can be mentioned.

  The silicon-based polymer of the present invention may be used alone or in combination of two or more. In the present invention, another release agent may be used in combination with the silicon-based polymer.

The use amount of the silicon-based polymer is preferably 0.3 to 20% by mass with respect to 100% by mass of the total solid content of the thermal transfer receiving layer. When it is less than 0.3% by mass, there is a possibility that a sufficient sticking suppressing effect and releasability effect cannot be obtained. On the other hand, if it exceeds 20% by mass, coating unevenness may occur during the formation of the receiving layer on the heat insulating layer, and the image quality may deteriorate.

(Silicon surfactant)
The thermal transfer receiving layer contains a silicon-based surfactant. The silicon surfactant used in the present invention is a surfactant having a structure in which a hydrophilic organic group is introduced into siloxane. The silicon-based surfactant has an effect of improving wettability to the base. Therefore, the leveling effect can be improved when forming the receiving layer on the heat insulating layer, a more uniform thermal transfer receiving layer can be formed, and the image quality can be further improved. Examples of the hydrophilic organic group to be introduced into siloxane include polyether, polyglycerin, pyrrolidone, betaine, sulfate, and phosphate. Among these, polyether-modified siloxane is more preferable.

  Specific examples of the silicon surfactant used in the present invention include polyether-modified siloxanes BYK-345, BYK-347, BYK-348, BYK-349, BYK-3455 (manufactured by BYK Chemie).

  The silicon surfactant of the present invention may be used alone or in combination of two or more.

The use amount of the silicon-based surfactant is preferably 0.3 to 5% by mass with respect to 100% by mass of the total solid content of the thermal transfer receiving layer. When the amount is less than 0.3% by mass, a sufficient leveling effect cannot be obtained, and the image quality may be deteriorated. Moreover, when it exceeds 5 mass%, it becomes easy to foam at the time of operation, and operativity may fall.

  Further, if necessary, one or more of a fluorescent dye, a plasticizer, an antioxidant, a pigment, a filler, an ultraviolet absorber, a light stabilizer, an antistatic agent and the like may be added to the thermal transfer receiving layer. . These additives may be mixed with a component for forming the thermal transfer receiving layer before coating.

Solid coating amount of the thermal transfer-receiving layer is preferably ^{0.1~12g / m 2, 1~10g / m} 2 is more preferable. When the solid content coating amount of the thermal transfer receiving layer is less than 0.1 g / m ² , the thermal transfer receiving layer cannot completely cover the surface of the heat insulating layer, and the image quality may deteriorate. On the other hand, when the solid content coating amount exceeds 12 g / m ² , not only is the coating effect saturated, which is uneconomical, but also the coating strength of the thermal transfer receiving layer is insufficient, so This may cause problems such as part peeling or insufficient heat insulation effect of the heat insulation layer, leading to a decrease in image density.

(Thermosensitive recording layer)
In the case of a heat-sensitive recording material, it is produced by forming a heat-sensitive recording layer on the heat insulating layer as described above. Various leuco dyes and colorants contained in the heat-sensitive recording layer can be used. For example, as leuco dyes that give black color, 3-diethylamino-6-methyl-7-anilinofluorane, 3-di (n-butyl) amino-6-methyl-7-anilinofluorane, 3-di (N-pentyl) amino-6-methyl-7-anilinofluorane, 3- (N-ethyl-N-isoamylamino) -6-methyl-7-arininofluorane, 3- (N-ethyl-p -Toluidino) -6-methyl-7-anilinofluorane, 3-pyrrolidino-6-methyl-7-anilinofluorane, 3-diethylamino-7- (m-trifluoromethylanilino) fluorane, 3- ( N-isoamyl-N-ethylamino) -7- (o-chloroanilino) fluorane, 3- (N-ethyl-N-2-tetrahydrofurfurylamino) -6-methyl-7-anilinov Oran, 3-diethylamino-6-chloro-7-anilinofluorane, 3- (Nn-hexyl-N-ethylamino) -6-methyl-7-anilinofluorane, 3- [N- (3 -Ethoxypropyl) -N-ethylamino] -6-methyl-7-anilinofluorane, 3- [N- (3-ethoxypropyl) -N-methylamino] -6-methyl-7-anilinofluorane , 3-diethylamino-7- (2-chloroanilino) fluorane, 3-di (n-butylamino) -7- (2-chloroanilino) fluorane, and the like can be used. If necessary, as the leuco dye, a leuco dye that develops a color tone different from that of black, for example, a color tone such as red, magenta, orange, blue, and green may be used.

  When the leuco dye is used in a solid fine particle state, the leuco dye is pulverized by various wet pulverizers such as a sand grinder, an attritor, a ball mill, and a cobo mill using water as a dispersion medium. In addition to water-soluble synthetic polymer compounds such as polyvinyl alcohol, modified polyvinyl alcohol such as sulfone-modified polyvinyl alcohol, methylcellulose, carboxymethylcellulose, hydroxypropylmethylcellulose and their derivatives, dispersed together with surfactants and antifoaming agents as necessary It can be dispersed in a medium to form a dispersion, and this dispersion can be used for the preparation of a thermal recording layer coating solution. Alternatively, after dissolving the leuco dye in a solvent, the solution is emulsified and dispersed in water using the water-soluble polymer as a stabilizer, and then the solvent is evaporated from the emulsion to make the leuco dye into solid fine particles. In any case, the average particle size of the dispersed particles of the leuco dye used in the solid fine particle state is preferably 0.2 to 3.0 μm, more preferably 0.3 to 1 in order to obtain an appropriate color development sensitivity. 0.0 μm.

  As a method for using the leuco dye, it can be used as a composite particle composed of an organic polymer and a leuco dye in addition to the solid fine particle. The composite particles can be produced by a known method. For example, a method for producing composite particles in which the organic polymer is at least one of polyurea and polyurea-polyurethane will be described. The composite particles are prepared by dissolving and mixing a leuco dye and a polymer-forming raw material that forms at least one of polyurea and polyurea-polyurethane by polymerization in a water-insoluble organic solvent having a boiling point of 100 ° C. or less. Is emulsified and dispersed in a hydrophilic protective colloid solution such as polyvinyl alcohol so that the average particle size is about 0.5 to 3 μm, and if necessary, a reactive substance such as polyamine is further mixed, and then this emulsified dispersion is heated. The organic solvent is volatilized and removed, and then the polymer-forming raw material is polymerized, or the leuco dye is dissolved in the polymer-forming raw material, and this solution is used as described above. And after the emulsion is dispersed to an average particle size of about 0.5 to 3 μm, the polymer-forming raw material is polymerized.

  A known compound can be used as the colorant used in the heat-sensitive recording layer. Specific examples of such a colorant include, for example, 4-tert-butylphenol, 4-acetylphenol, 4-tert-octylphenol, 4,4′-sec-butylidenediphenol, 4-phenylphenol, 4,4′- Dihydroxydiphenylmethane, 4,4′-isopropylidene diphenol, 4,4′-cyclohexylidene diphenol, 1,1-bis (4-hydroxyphenyl) -1-phenylethane, 4,4′-dihydroxydiphenyl sulfide, 4 , 4′-thiobis (3-methyl-6-tert-butylphenol), 4,4′-dihydroxydiphenylsulfone, 2,4′-dihydroxydiphenylsulfone, 4-hydroxy-4′-isopropoxydiphenylsulfone, and bis ( 3-allyl-4-hydroxyl Nyl) sulfone, bis (p-hydroxyphenyl) butyl acetate, phenolic compounds such as methyl bis (p-hydroxyphenyl) acetate, 4-hydroxybenzophenone, dimethyl 4-hydroxyphthalate, methyl 4-hydroxybenzoate, 4- Propyl hydroxybenzoate, 4-hydroxybenzoate-sec-butyl, phenyl 4-hydroxybenzoate, benzyl 4-hydroxybenzoate, tolyl 4-hydroxybenzoate, chlorophenyl 4-hydroxybenzoate, 4,4′-dihydroxydiphenyl ether Phenolic compounds such as benzoic acid, p-tert-butylbenzoic acid, trichlorobenzoic acid, terephthalic acid, salicylic acid, 3-tert-butylsalicylic acid, 3-isopropylsalicylic acid, 3-benzylsalicylic acid, 3- (α -Methylbenzyl) salicylic acid, aromatic carboxylic acids such as 3,5-di-tert-butylsalicylic acid, and salts of these phenolic compounds and aromatic carboxylic acids with polyvalent metals such as zinc, magnesium, aluminum, calcium, etc. Organic acidic substances such as Np-toluenesulfonyl-N′-3- (p-toluenesulfonyloxy) phenylurea, N- (p-toluenesulfonyl) -N ′-(p-butoxycarboyl) urea, N And urea compounds such as -p-tolylsulfonyl-N'-phenylurea.

  The ratio of the leuco dye and the colorant used in the heat-sensitive recording layer should be appropriately selected according to the type of the leuco dye and the colorant to be used, and is not particularly limited. On the other hand, it is preferable that the colorant is about 10 to 70% by mass, particularly about 12 to 50% by mass, and the basic dye is about 3 to 50% by mass, particularly about 5 to 40% by mass.

(Silicon polymer)
The heat-sensitive recording layer preferably contains the silicon-based polymer as in the case of the thermal transfer receiving layer. A silicon-based polymer has a good effect as a lubricant, and can suppress sticking when used in a heat-sensitive recording layer. Further, similarly to the thermal transfer receiving layer, it can be oriented on the surface of the heat-sensitive recording layer and has an effect of improving the surface smoothness, and further a low-foaming coating liquid can be obtained. The silicon-based polymer is preferably a polyether-modified polydimethylsiloxane as in the case of the thermal transfer receiving layer, and more preferably a polyether-modified polydimethylsiloxane represented by the general formula (1). Can be further improved.

(Silicon surfactant)
The heat-sensitive recording layer preferably contains the silicon surfactant as in the case of the thermal transfer receiving layer. The silicon surfactant can improve the leveling effect when forming the heat-sensitive recording layer on the heat insulating layer, can form a more uniform heat-sensitive recording layer, and can further improve the image quality.

  It is also possible to use various pigments in the coating solution, such as kaolin, clay, calcium carbonate, calcined clay, calcined kaolin, titanium oxide, diatomaceous earth, fine particulate anhydrous silica, activated clay, and styrene. Examples include organic pigments such as microballs, nylon powder, polyethylene powder, urea / formalin resin filler, and raw starch particles.

  Furthermore, a sensitizer can be used in combination according to the purpose. Specific examples of the sensitizer include stearic acid amide, methoxycarbonyl-N-stearic acid benzamide, N-benzoyl stearic acid amide, N-eicosanoic acid amide, ethylene bistearic acid amide, behenic acid amide, and methylenebisstearic acid. Amide, N-methylol stearic acid amide, dibenzyl terephthalate, dimethyl terephthalate, dioctyl terephthalate, benzyl p-benzyloxybenzoate, phenyl 1-hydroxy-2-naphthoate, 2-naphthylbenzyl ether, m-terphenyl, Oxalic acid dibenzyl, oxalic acid-di-p-methylbenzyl, oxalic acid-di-p-chlorobenzyl, p-benzylbiphenyl, tolylbiphenyl ether, di (p-methoxyphenoxyethyl) ether, 1,2-di (3 -Mechi Phenoxy) ethane, 1,2-di (4-methylphenoxy) ethane, 1,2-di (4-methoxyphenoxy) ethane, 1,2-di (4-chlorophenoxy) ethane, 1,2-diphenoxyethane 1- (4-methoxyphenoxy) -2- (2-methylphenoxy) ethane, p-methylthiophenylbenzyl ether, 1,4-di (phenylthio) butane, p-acetoluidide, p-acetophenetide, N- Examples include acetoacetyl-p-toluidine, di (β-biphenylethoxy) benzene, p-di (vinyloxyethoxy) benzene, 1-isopropylphenyl-2-phenylethane, and the like. When a sensitizer is used, the amount used may be an effective amount for sensitization, but is usually about 0.5 to 40% by mass with respect to the total solid content of the heat-sensitive recording layer. It is preferable to mix | blend in the range of about 1-25 mass%.

  Further, as long as the desired effect is not impaired, a storability improving agent may be used in combination in order to further improve the storability of the recorded image according to the purpose. Specific examples of such storage stability improvers include, for example, 2,2′-methylenebis (4-methyl-6-tert-butylphenol), 2,2′-ethylenebis (4-methyl-6-tert-butylphenol) 2, 2'-methylenebis (4-ethyl-6-tert-butylphenol), 2,2'-methylenebis (4,6-di-tert-butylphenol), 2,2'-ethylidenebis (4,6-di-tert- Butylphenol), 2,2'-ethylidenebis (4-methyl-6-tert-butylphenol), 2,2'-ethylidenebis (4-ethyl-6-tert-butylphenol), 2,2 '-(2,2 -Propylidene) bis (4,6-di-tert-butylphenol), 2,2'-methylenebis (4-methoxy-6-tert-butyl) Phenol), 2,2'-methylenebis (6-tert-butylphenol), 4,4'-thiobis (3-methyl-6-tert-butylphenol), 4,4'-thiobis (2-methyl-6-tert-) Butylphenol), 4,4′-thiobis (5-methyl-6-tert-butylphenol), 4,4′-thiobis (2-chloro-6-tert-butylphenol), 4,4′-thiobis (2-methoxy-) 6-tert-butylphenol), 4,4′-thiobis (2-ethyl-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), 4,4'-dihydroxy-3,3 ', 5,5'-tetrabromodiphenyl sulfone, 4,4'-dihydroxy-3,3', 5,5'-tetramethyl Diphenylsulfone, 2,2-bis (4-hydroxy-3,5-dibromophenyl) propane, 2,2-bis (4-hydroxy-3,5-dichlorophenyl) propane, 2,2-bis (4-hydroxy-) Hindered phenol compounds such as 3,5-dimethylphenyl) propane, N, N′-di-2-naphthyl-p-phenylenediamine, 2,2′-methylenebis ( , 6-di -tert- butylphenyl) phosphate sodium, and the like. When a preservability improver is used, the amount used may be an effective amount for improving the preservability, but it is usually about 1 to 30% by mass with respect to the total solid content of the thermosensitive recording layer. It is preferable to mix | blend in the range of about 2-20 mass%.

  Specific examples of the adhesive added to the heat-sensitive recording layer include, for example, oxidized starch, acid-modified starch, phosphate esterified starch, enzyme-modified starch, cation-modified starch, esterified starch, etherified starch, and vinyl acetate-modified. Starch such as grafted starch, cellulose derivatives such as methylcellulose, ethylcellulose, carboxymethylcellulose, methoxycellulose, hydroxyethylcellulose and hydroxypropylmethylcellulose, fully or partially saponified polyvinyl alcohol, silicon modified polyvinyl alcohol, diacetone modified polyvinyl alcohol, carboxy modified polyvinyl alcohol , Polyvinyl alcohols such as acetoacetyl-modified polyvinyl alcohol, sodium polyacrylate, polyacrylamide, polyvinyl pyrrolidone, acrylate amide Crylic acid ester copolymer, acrylic acid amide / acrylic acid ester / methacrylic acid copolymer, styrene / maleic anhydride copolymer alkali salt, isobutylene / maleic anhydride copolymer alkali salt, sodium alginate, gelatin, casein, etc. Water-soluble polymers: polyvinyl acetate, polyurethane, polyacrylic acid, polyacrylic ester, polybutyl methacrylate, styrene / butadiene copolymer, vinyl chloride / vinyl acetate copolymer, ethylene / vinyl acetate copolymer, styrene -Can be used in combination with latex such as butadiene / acrylic copolymers. The amount of the adhesive used is about 5 to 50% by mass, particularly about 8 to 40% by mass, based on the total solid content of the heat-sensitive recording layer.

  The thermosensitive recording layer coating liquid containing the above-mentioned various components generally uses water as a dispersion medium, and disperses dyes, colorants, sensitizers, etc. together or separately using a stirring / pulverizing machine such as a ball mill, attritor, or sand mill. It is prepared by blending materials obtained by, for example.

  In the present invention, in order to improve the whiteness of the heat-sensitive recording layer and improve the uniformity of the image, a fine particle pigment having a high whiteness and an average particle size of 10 μm or less can be contained in the heat-sensitive recording layer. For example, calcium carbonate, magnesium carbonate, kaolin, clay, talc, calcined clay, silica, diatomaceous earth, synthetic aluminum silicate, zinc oxide, titanium oxide, aluminum hydroxide, barium sulfate, surface treated calcium carbonate, silica, etc. Inorganic pigments and organic pigments such as urea-formalin resin, styrene-methacrylic acid copolymer resin, and polystyrene resin can be used. The amount of the pigment blended is preferably an amount that does not decrease the color density, that is, 50% by mass or less based on the total solid content of the heat-sensitive recording layer.

  Moreover, in order to improve the water resistance of the heat-sensitive recording layer, a cross-linking agent for three-dimensionally curing the adhesive can be contained in the heat-sensitive recording layer. For example, aldehyde compounds such as glyoxal, polyamine compounds such as polyethyleneimine, epoxy compounds, polyamide resins, melamine resins, dimethylolurea compounds, aziridine compounds, blocked isocyanate compounds, carboxylic acid dihydrazide compounds, ammonium persulfate and ammonium chloride An inorganic compound such as ferric iron, magnesium chloride, sodium tetraborate, potassium tetraborate, or at least one crosslinkable compound selected from boric acid, boric acid triester, boron-based polymer, etc. It is preferably used in the range of 1 to 10% by mass relative to the solid content.

  Examples of the wax added to the heat-sensitive recording layer include waxes such as paraffin wax, carnauba wax, microcrystalline wax, polyolefin wax, and polyethylene wax, and higher fatty acid amides such as stearamide, ethylenebisstearic amide, and higher. Examples thereof include fatty acid esters and derivatives thereof.

  Examples of the metal soap added to the heat-sensitive recording layer include higher fatty acid polyvalent metal salts such as zinc stearate, aluminum stearate, calcium stearate, and zinc oleate. In addition, a colored dye and / or a colored pigment can be contained in the heat-sensitive recording layer in order to adjust the color tone of the white paper portion. If necessary, various additives such as an oil repellent, an antifoaming agent, and a viscosity modifier can be further added to the heat-sensitive recording layer as long as the effects of the present invention are not impaired.

  A plurality of heat-sensitive recording layers can be laminated to form a multicolor heat-sensitive recording sheet. A protective layer can also be provided on the thermosensitive recording layer. When a plurality of heat-sensitive recording layers are laminated, it is preferable that the uppermost layer contains the silicon polymer and the silicon surfactant. When a protective layer is provided, the protective layer preferably contains the silicon-based polymer and the silicon-based surfactant, and may be included in the heat-sensitive recording layer.

(Back layer)
On the surface (back surface) on the side where the heat insulating layer of the sheet-like substrate is not provided, a back surface layer can be appropriately provided.
The purpose of the back layer is to improve runnability, prevent static electricity, prevent scratching of the receiving layer due to friction between the thermal transfer receiving sheets, and prevent dye transfer to the back side when the thermal transfer receiving sheets after printing are stacked. The back layer contains a resin, a pigment, an antistatic agent and the like according to the purpose.
Further, in the present invention, adhesive paper, rewet adhesive paper, delayed tack paper can be used by applying coating processing such as pressure sensitive adhesive, rehumidified adhesive, delayed tack type pressure sensitive adhesive on the back surface, or Can be made into a recording material having a magnetically recordable layer on the back surface by applying magnetic processing. In addition, a thermal recording layer and a thermal transfer receiving layer may be formed on the back surface in the same manner as the front surface to form a double-sided recording material, such as a recording material different from the front surface, for example, thermal transfer recording, thermal recording, inkjet recording, carbonless recording, xerographic recording. It is also possible to provide a recording medium capable of performing double-sided recording.

(Calendar processing)
The recording sheet (thermal transfer receiving sheet or thermosensitive recording sheet) may be subjected to a calendar process. By the calendering process, unevenness on the surface of the obtained recording material can be reduced and a uniform image can be obtained. The calendar process may be performed at any stage. As the calendar apparatus used for the calendar process, a calendar apparatus generally used in the paper industry such as a super calendar, a soft calendar, a gloss calendar, and a clearance calendar can be appropriately used.

Various auxiliary agents such as wetting agents, dispersants, thickeners, antifoaming agents, colorants, antistatic agents, preservatives and the like used in the production of general coated papers are appropriately added to each coating layer. The
The coating layer of each coating layer is a known coater such as a bar coater, gravure coater, comma coater, blade coater, air knife coater, gate roll coater, die coater, curtain coater, and slide bead coater. A predetermined coating solution can be applied and dried.

  The present invention will be described more specifically with reference to the following examples. However, the present invention is not limited to these examples. Unless otherwise specified, “part” and “%” in the examples represent “part by mass” and “% by mass”, respectively.

Example 1
As the sheet-like substrate, art paper (trade name: OK Kanfuji N, made by Oji Paper Co., Ltd., basis weight 174.4 g / m ² ) having a thickness of 150 μm is used, and the coating liquid for the heat insulating layer having the following composition on one side thereof— 1 was coated and dried so that the solid coating amount was 12 g / m ² to form a heat insulating layer.
(Preparation of coating solution-1 for heat insulation layer)
55 parts of foamed hollow particles mainly composed of acrylonitrile and methacrylonitrile (average particle size 3.2 μm, volumetric hollowness 85%)
10 parts of microcapsule-type hollow particles (trade name: Ropeke HP-1055, manufactured by Rohm and Haas, average particle size 1.0 μm, volume hollowness 55%)
10 parts of polyvinyl alcohol (trade name: PVA205, manufactured by Kuraray)
55 parts of acrylic resin (trade name: ES-Y1021N, Chuo Rika Kogyo, Tg: 47 ° C.)
200 parts of water

On the heat insulation layer, a thermal transfer receiving layer coating solution having the following composition was applied and dried so that the solid coating amount was 3 g / m ² to form a thermal transfer receiving layer to obtain a thermal transfer receiving sheet. .
(Coating solution for thermal transfer receiving layer)
100 parts of vinyl chloride / vinyl acetate copolymer emulsion (trade name: Vinibrand 603, manufactured by Nissin Chemical Industry, Tg: 63 ° C.)
Carbodiimide crosslinking agent 5 parts (trade name: Carbodiimide V-02, manufactured by Nisshinbo)
Polyether-modified polydimethylsiloxane 1.5 parts (trade name: BYK-378, polyether chain: EO / PO, manufactured by Big Chemie)
Silicone surfactant 2 parts (Brand name: BYK-3455, manufactured by Big Chemie)
300 parts of water

Example 2
In preparing the coating solution for the thermal transfer receiving layer of Example 1, instead of polyether-modified polydimethylsiloxane (trade name: BYK-378, polyether chain: EO / PO, manufactured by BYK Chemie), aralkyl-modified polydimethylsiloxane ( A thermal transfer receiving sheet was obtained in the same manner as in Example 1 except that trade name: BYK-322, manufactured by Big Chemie) was used.

Example 3
In the preparation of the coating solution for the thermal transfer receiving layer of Example 1, instead of polyether-modified polydimethylsiloxane (trade name: BYK-378, polyether chain: EO / PO, manufactured by BYK Chemie), polyester-modified polydimethylsiloxane ( A thermal transfer receiving sheet was obtained in the same manner as in Example 1 except that trade name: BYK-313, manufactured by Big Chemie) was used.

Example 4
In preparation of the coating solution for the thermal transfer receiving layer of Example 1, instead of polyether-modified polydimethylsiloxane (trade name: BYK-378, polyether chain: EO / PO, manufactured by Big Chemie), polyether-modified polydimethylsiloxane A thermal transfer receiving sheet was obtained in the same manner as in Example 1 except that (trade name: TSF4440, polyether chain: EO, manufactured by Momentive Performance Materials) was used.

Example 5
A thermal transfer receiving sheet was prepared in the same manner as in Example 1 except that a silicon surfactant (trade name: BYK-3455, manufactured by BYK Chemie) was not used in the preparation of the coating solution for the thermal transfer receiving layer of Example 1. Obtained.

Example 6
Except for changing the polyether-modified polydimethylsiloxane (trade name: BYK-378, polyether chain: EO / PO, manufactured by Big Chemie) to 0.15 parts in the preparation of the coating solution for the thermal transfer receiving layer of Example 1. In the same manner as in Example 1, a thermal transfer receiving sheet was obtained.

Example 7
Thermal transfer in the same manner as in Example 1 except that the silicon surfactant (trade name: BYK-3455, manufactured by BYK Chemie) was changed to 5.5 parts in the preparation of the thermal transfer receiving layer coating solution of Example 1. A receiving sheet was obtained.

Comparative Example 1
In the preparation of the coating solution for the thermal transfer receiving layer of Example 1, polyether-modified polydimethylsiloxane (trade name: BYK-378, polyether chain: EO / PO, manufactured by BYK Chemie) and a silicon surfactant (trade name: A thermal transfer receiving sheet was obtained in the same manner as in Example 1 except that BYK-3455 (manufactured by BYK Chemie) was not used.

Comparative Example 2
In preparation of the coating solution for the thermal transfer receiving layer of Example 1, instead of polyether-modified polydimethylsiloxane (trade name: BYK-378, polyether chain: EO / PO, manufactured by BYK Chemie), a fluorosurfactant ( A thermal transfer receiving sheet was obtained in the same manner as in Example 1 except that trade name: Surflon S145, manufactured by AGC Seimi Chemical Co., Ltd. was used.

(Evaluation)
The following evaluation tests were conducted on the receiving layer coating solutions and thermal transfer receiving sheets obtained in the above Examples and Comparative Examples, and the results are shown in Table 1.
(Paint foamability)
80 g of the receiving layer coating solution was put in a 200 ml container and subjected to vibration treatment for 20 seconds up and down, and foaming was subjected to sensory evaluation.
○: There is little foaming of the paint, and there is no problem in operation.
(Triangle | delta): Although foaming of paint is seen, it is a level which does not have a problem in operation.
X: The foaming of the paint is large and there is a problem in operation.

(Image density)
Using a commercially available thermal transfer video printer (trade name: UP-50, manufactured by Sony Corporation) equipped with a sublimation type thermal transfer ink ribbon (trade name: UP-540, manufactured by Sony Corporation) A solid image was printed. Using a Macbeth reflection densitometer RD914, the print density of the black solid image was measured, and the image density was evaluated.
A: Black solid print density is 2.0 or more and high sensitivity.
○: The black solid print density is 1.9 or more and less than 2.0, and can be used practically without any problem.
(Triangle | delta): The printing density of black solid is 1.8 or more and less than 1.9, and it is practical.
X: The black solid print density is less than 1.8, which is not suitable for practical use.

(Image uniformity)
Using a commercially available thermal transfer video printer (trade name: UP-50, manufactured by Sony Corporation) equipped with a sublimation type thermal transfer ink ribbon (trade name: UP-540, manufactured by Sony Corporation) on a receiving sheet at room temperature of 5 ° C. The image was printed so that the image density when measured with a Macbeth reflection densitometer RD914 was 0.6 to 0.7, and the dot reproducibility of the image was visually evaluated according to the following criteria.
(Double-circle): There is no missing dot and it is excellent in sharpness.
○: Slightly missing dots can be seen, but can be used practically without any problem.
(Triangle | delta): Although dot missing is seen, it is practical.
X: Missing dots are conspicuous and are not suitable for practical use.

(Sticking)
Using a commercially available thermal transfer video printer (trade name: UP-50, manufactured by Sony Corporation) equipped with a sublimation type thermal transfer ink ribbon (trade name: UP-540, manufactured by Sony Corporation) on a receiving sheet at room temperature of 5 ° C. A gradation image (16 gradations) was printed and evaluated according to the following criteria.
A: The dye thermal transfer sheet and the thermal transfer receiving sheet are peeled off without peeling sound, and there is no linear printing unevenness or peeling line, which is good.
○: Some peeling noise is generated when the dye thermal transfer sheet and thermal transfer receiving sheet are peeled off, but there is no linear printing unevenness or peeling line, and there is no practical problem.
Δ: Peeling sound is generated when the dye thermal transfer sheet and thermal transfer receiving sheet are peeled off, but there is no linear printing unevenness or peeling line, and there is no practical problem.
X: The dye thermal transfer sheet and the thermal transfer receiving sheet are not partly peeled off, and there is a problem in practical use.

(Releasability)
Using a commercially available thermal transfer video printer (trade name: UP-50, manufactured by Sony Corporation) equipped with a sublimation type thermal transfer ink ribbon (trade name: UP-540, manufactured by Sony Corporation) on a receiving sheet at a room temperature of 35 ° C. A black solid image was printed and evaluated according to the following criteria.
(Double-circle): The dye thermal transfer sheet and the thermal transfer receiving sheet are peeled off without peeling sound, and there is no printing defect, which is good.
○: Slight peeling noise is generated when the dye thermal transfer sheet and thermal transfer receiving sheet are peeled off, but there is no printing defect and there is no practical problem.
Δ: Peeling sound is generated when the dye thermal transfer sheet and thermal transfer receiving sheet are peeled off, but there is no printing defect and there is no practical problem.
X: The dye thermal transfer sheet and the thermal transfer receiving sheet do not partially peel off, and printing defects occur, causing problems in practical use.

表１から明らかなように、実施例１〜７の熱転写受容シートは、塗料の発泡性が少なく操業性に優れ、かつ画像濃度が高く、画像均一性に優れ、スティッキング、離型性の印画走行性に優れた熱転写受容シートである。

As is apparent from Table 1, the thermal transfer receiving sheets of Examples 1 to 7 have low foamability of the paint, excellent operability, high image density, excellent image uniformity, sticking and releasable printing running. It is a thermal transfer receiving sheet with excellent properties.

  The present invention provides a heat-sensitive recording sheet, and the obtained thermal transfer receiving sheet is suitable for a dye thermal transfer printer, has high image density, excellent image uniformity, sticking, and releasability printing runability. It is possible to provide an excellent thermal transfer receiving sheet, which is extremely useful in practice. Further, the present invention can be applied not only to a thermal transfer receiving sheet but also to a thermal recording sheet that develops color by heat.

Claims (6)

  In a thermal recording sheet in which a thermal insulation layer containing hollow particles and a thermal transfer receiving or thermal recording recording layer are sequentially laminated on at least one surface of the sheet-like substrate, the recording layer contains a silicon-based polymer A recording sheet characterized by:   The recording sheet according to claim 1, wherein the silicon-based polymer of the recording layer is polyether-modified polydimethylsiloxane. The recording sheet according to claim 2, wherein the polyether-modified polydimethylsiloxane of the recording layer is represented by the following general formula (1).

(In general formula (1), X, Y and a, b, and m represent positive integers. R represents a hydrogen atom or an alkyl group.)   The recording sheet according to claim 1, wherein the recording layer contains a silicon surfactant.   The recording sheet according to claim 4, comprising 0.3 to 5 parts by mass of a silicon-based surfactant with respect to 100 parts by mass of the total solid content of the recording layer.   The recording sheet according to any one of claims 1 to 5, comprising 0.3 to 20 parts by mass of a silicon-based polymer with respect to 100 parts by mass of the total solid content of the recording layer.