JP2000190627A - Recording sheet - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a heating adhesive type recording sheet capable of adhering by heating to a woodfree paper, etc., while retaining the texture of a recording surface and a laminated recording sheet obtained by laminating the recording sheet on the woodfree paper. SOLUTION: In the heating adhesive type recording sheet comprising a heating adhesive layer exhibiting no pressure sensitive adhesive and no adhesive properties in a normal state but exhibiting adhesive properties when heated on a non-recording surface of a nonwoven fabric coated or impregnated with an ink receptive component, a softening point of fibers for constituting the nonwoven fabric is higher by 40 deg.C or above than an adhesive starting temperature of the adhesive layer, and a fiber size of the fibers for constituting the fabric is 0.1 to 0.8 denier, and the sheet is adhered to the woodfree paper by heating.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to laminating a recording sheet made of a non-woven fabric having an ink-receiving component which can be printed by an ink jet recording method, and other high-quality paper, coated paper, synthetic resin sheet, glass, metal or the like. The present invention relates to an adhesive-type recording sheet capable of performing the following, and particularly, a heat-adhesive-type recording sheet which has a feeling of cloth on a recording surface and can be posted by attaching to a postcard before payment, and a laminated recording sheet using the same. It is about.

[0002]

2. Description of the Related Art Ink-jet recording is a method in which minute droplets of ink are made to fly and adhere to a recording sheet such as paper by various operating principles to record images and characters. It has features such as easy multi-coloring, great flexibility in recording patterns, and no need for development-fixing, and is rapidly spreading in various applications as a recording device for various figures including Chinese characters and color images. Furthermore, the image formed by the multi-color inkjet method is
It is possible to obtain a record comparable to multicolor printing by the plate making method. In addition, in applications requiring a small number of copies, it is being widely applied to the field of full-color image recording because of its low cost.

As recording sheets used in the ink jet recording system, efforts have been made in terms of apparatuses and ink compositions in order to use high-quality paper and coated paper used for ordinary printing and writing. However, with the improvement of the performance of ink jet recording apparatuses such as high-speed, high-definition and full-color apparatuses, and expansion of applications, more advanced characteristics are also required for recording sheets. That is, as the recording sheet, the density of the print dots is high, the color tone is bright and vivid, the ink does not flow out or bleeds even when the print dots overlap quickly, and the print dots are printed in the horizontal direction. Is required to have high image reproducibility such that the diffusion of the image is not unnecessarily large and the periphery is smooth and not blurred. That is, in order to obtain a good image, general high-quality paper or coated paper for printing is insufficient, and a recording paper having a dedicated ink receiving layer of an ink jet recording method is indispensable.

[0004] On the other hand, as an application for individuals with a small number of copies to be made, it is used for postcards and the like, and a destination and a communication message are ink-jet recorded on both sides. Further, as one of recent environmental measures, there has been a demand for a recording sheet that can be used for front and back recording that requires a small number of sheets to be used. However, for example, when double-sided ink jet recording is performed on a general non-coat type ink jet recording sheet, swelling of the opposite side caused by ink seepage when recording on one side, visual recognition of recording due to strike-through of the ink on the opposite side. In the case of an ink jet recording sheet having an ink receiving layer on both the front and back sides, the penetration of the solvent in the coating layer into the support becomes larger than that having the ink receiving layer on one side only, more fundamentally, In addition, there has been a problem that the ink jet recording property of each surface is lowered, and the curl property is poor, and the demand for advanced characteristics cannot be satisfied.

[0005] In the case of using such recording paper on both sides of which ink-jet recording is possible for a postcard, it may be a normal government-made postcard, a postcard with a lottery number (a postcard with a new year's card, a postcard for a hot summer visit with a lottery). ") Cannot be used, it is a privately-made postcard, the opportunity for lottery is not available, the utility value is low, and even though the fee is the same as government-made postcards, it is necessary to attach stamps, and the postal code frame, mail It is necessary to provide a postcard or similar description on the surface. In addition, recording paper that has been surface-treated for inkjet recording may have insufficient water resistance, and the printed portion (including the postal code entry frame on which inkjet recording has been performed) may bleed due to the moisture when a stamp is applied, or the stamp may be printed with ink. There were problems such as peeling and falling off with the receiving layer.

[0006] A postcard service for attaching a photo printed at the same size as a postcard to a New Year's postcard has also penetrated considerably into ordinary households. However, sticking a photo on a New Year's postcard at home is usually used at home because the adhesive side of the photographic paper is made of polyethylene resin and has poor adhesion to general glue and low adhesive strength. With such adhesives, a problem may occur that the adhesive is peeled off during mailing.
For this reason, it is necessary to ask a specialized trader, and if the number of sheets is not a certain number, it will be considerably expensive.

On the other hand, with the rapid spread of computers to ordinary households in recent years, it has become possible to print images beautifully in ordinary households by the ink jet recording system. For this reason, an increasing number of people design their own backside of a New Year's card and print an image on a New Year's postcard with a government-made New Year's card using an inkjet recording type printer. However, the New Year's postcard with a government-made New Year's card is ordinary high-quality paper, and is not a paper compatible with the inkjet recording method. Therefore, no matter how beautifully image data is produced, it is possible to print only an image with a moderate appearance.

The inventors of the present invention have invented a heat-adhesive recording sheet having a heat-adhesive layer provided on the back surface of ink-jet recording paper or the like and have applied for a patent (Japanese Patent Application Laid-Open No. 9-146462).
issue). Since the heat-adhesive recording paper had no tack at room temperature, the heat-adhesive recording paper was easy to align and could be easily heat-adhered with a home iron.

[0009] However, with the spread of computers and printers, beautiful printing can be easily performed at ordinary homes, which makes it difficult to differentiate from others and make it difficult to give an unexpected impression to the viewer. ing. Therefore,
As one means of differentiating from other things, it was considered to heat-bond a fabric having ink jet suitability, but at the time of heat bonding, the fibers constituting the fabric were discolored or melted, and the appearance was improved. It often became worse and turned into a film, and the texture of the film was often impaired.

[0010]

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a heat-adhesive recording sheet which can be heat-bonded to high quality paper or the like while keeping the texture of the recording surface, and to bond the recording sheet to the high quality paper. To provide a laminated recording paper.

[0011]

Means for Solving the Problems The present inventors have made intensive studies to solve the above-mentioned problems, and as a result, have reached the following invention.

That is, a heat-adhesive recording sheet in which a non-recording surface of a non-woven fabric coated or impregnated with an ink-receiving component is provided with a heat-adhesive layer which exhibits neither adhesiveness nor adhesiveness under normal conditions and exhibits adhesiveness when heated. Wherein the softening point of the fibers constituting the nonwoven fabric is higher than the bonding start temperature of the heat bonding layer by 40 ° C. or more.

[0013] The invention is a heat-adhesive recording sheet wherein the fiber diameter of the fibers constituting the nonwoven fabric is 0.8 denier or less and 0.1 denier or more.

This is an invention of a laminated recording paper in which a heat-adhesive recording sheet and high quality paper are bonded by heating.

This is an invention of a laminated postcard in which the high-quality paper is an official postcard.

[0016]

BEST MODE FOR CARRYING OUT THE INVENTION The present inventors have been diligently studying a heat-adhesive recording sheet using a nonwoven fabric as a support. Of course, by using a material that is higher than 40 ° C., the recording sheet is not damaged by heating such as discoloration or melting during heating. It was found that the print density was improved by the provision.

Furthermore, the use of a non-woven fabric made of fibers having a fiber diameter of 0.8 denier or less and 0.1 denier or more eliminates the occurrence of bumps at the time of heat bonding.

However, if the softening point of the fibers constituting the non-woven fabric is lower than 40 ° C. lower than the bonding start temperature of the heat bonding layer, the unevenness at the time of heat bonding becomes conspicuous and practical problems arise. .

The heat bonding layer of the present invention comprises a heat seal layer,
Refers to a delayed tack layer or a hot melt layer.

The heat seal coating agent constituting the heat seal layer is described in the book "All About Converting".
This is a so-called heat seal coating agent in a narrow sense as described in (Processing Technology Research Institute, 1993, P351-), and is different from a non-solvent hot melt coating resin. For example, the constituent resin may be in the form of an organic solvent solution such as polyolefin resin, polyester, ethylene / vinyl acetate copolymer resin, polyacrylate, vinyl chloride acetate, ethylene / acrylic acid copolymer resin, or an aqueous dispersion solution. Used. A heat seal layer obtained by preparing and applying a coating liquid using this resin, and drying at a temperature higher than the minimum film forming temperature, is dried to a state where there is no stickiness even with a finger in a normal state. Although it is possible to pass paper through ordinary inkjet recording printers without any problems, once heated to a temperature higher than the melting point, the heat seal layer is plasticized and becomes tacky, and high-quality paper, glass, metal, synthetic resin sheets, wood It can be bonded with a light pressure to the adhesive, and the adhesiveness generated here remains even after recooling.

The heat seal layer can be applied as a solvent solution or as an emulsion and dried.

Examples of the resin constituting the delayed tack layer include acrylic resins, vinyl chloride resins, vinyl acetate resins, styrene / acrylic copolymer resins, styrene / butadiene copolymer resins, polystyrene resins, polyamide resins and the like. Can be One or several crystalline (solid) plasticizers such as dicyclohexyl phthalate, diphenyl phthalate, N-cyclohexyl-p
-Toluenesulfonamide, o / p-toluenesulfonamide and the like are contained. A delayed tack layer obtained by preparing a coating liquid using this resin and coating it and drying it at a temperature equal to or lower than the melting point of the plasticizer is dried to a state without stickiness even when touched with a finger in a normal state. Can be passed through the inkjet recording printer without any problem, but once heated above the melting point of the plasticizer, the delayed tack layer is plasticized and becomes tacky. Therefore, it can be bonded to high-quality paper, glass, metal, synthetic resin sheet, wood, or the like with a light pressure, and the adhesiveness generated here remains even if the plasticizer is recrystallized.

The resin constituting the hot melt layer is generally a thermoplastic material (100% solid) that melts in a temperature range of 60 ° C. to 180 ° C.
Resins and waxes are used. Alkyd (modified polyester), asphalt and coal tar bluish, coumarone-indene resin, rosin and its derivatives, terpene resin, wax (mineral, vegetable and petroleum), ethylene / ethyl acrylate copolymer, ethylene / ethyl acrylate Vinyl acetate copolymer, polyethylene, polyvinyl acetate and its copolymer, polycarbonate, polystyrene and its copolymer, polystyrene and its copolymer, polypropylene, polyvinyl ether, polyamide, polyester (thermoplastic), phenoxy resin (plastic ), Resins such as polyisoprene, polyurethane, and thermoplastic elastomers (SBS, SIS, SEBS, etc.).

The hot melt adhesive basically contains a resin having the following three functions. That is, the viscosity of the melt
High molecular weight polymers that impart cohesiveness to solids; synthetic elastomers that increase tack, elasticity, and strength; and synthetic or natural resins that impart viscosity and fluidity and promote wettability. In addition, a wax that reduces the cost, lowers the viscosity of the mixture, and facilitates application may be contained.
The application of the hot melt layer can be performed by applying and drying as a solvent solution or as an emulsion, or by using a hot melt extrusion.

In the heat-adhesive layer of the present invention, other additives such as a dispersant, a thickener, a flow improver, an antifoaming agent, a foam inhibitor, a release agent, a foaming agent, a penetrant, Color dyes, color pigments, fluorescent whitening agents, ultraviolet absorbers, antioxidants, preservatives, anti-binders, water-proofing agents, wet paper strength agents, dry paper strength agents, antistatic agents, anti-aging agents, etc. Can be appropriately blended.

The coating amount of the heat-adhesive layer is not particularly limited from the characteristics of the print density, but varies depending on the bonding method. However, for the purpose of ensuring good adhesiveness, the coating amount is preferably in the range of 5 to 40 g / m ^2. Preferably, there is. If the coating amount of the heating adhesive layer is smaller than this range, the bonding will be weak due to insufficient adhesiveness. If it is larger than this range, not only does it hinder the running of the recording sheet, but it also causes a cost increase economically.

Examples of the method of applying the heating adhesive layer of the present invention include gravure coater, gravure offset coater, bar coater, roll coater, air knife coater, U comma coater, smoothing coater, micro gravure coater, reverse roll coater, and the like. 4
Any coating method can be used in consideration of the form and suitability of the resin constituting the heat-adhesive layer such as a book coater or a 5-coater, a blade coater, a dip coater, a drop curtain coater, a slide coater, a die coater, and a melt extrusion die. Good.

As the fiber forming the nonwoven fabric, for example,
Polyester fibers such as homopolymers and copolymers such as polyethylene terephthalate, polybutylene terephthalate, or modified polymers of these polymers, and polyolefin fibers such as homopolymers and copolymers such as polypropylene, polyethylene, polystyrene, or modified polymers of these polymers Organic synthetic fibers such as polyacrylonitrile fibers such as acrylic fiber and modacrylic fiber, nylon fibers such as nylon 6, nylon 66, etc .; organic synthetic fibers such as polyvinyl alcohol fiber and urethane fiber; Regenerated fibers such as fibers spun from solutions of collagen, alginic acid, chitin, etc .; semi-synthetic fibers such as acetate fibers; cellulosic fibers such as hemp, cotton, pulp, wool, silk, etc. Natural fibers such as white matter fibers; metal fibers, glass fibers, inorganic fibers such as carbon fibers; includes various fibers such as, can be used singly or in combination.

The softening point of the fibers constituting the nonwoven fabric used in the present invention needs to be higher by at least 40 ° C. than the bonding start temperature of the heat bonding layer. The value of 40 ° C. may be a relative value, and if the bonding start temperature of the heating adhesive layer is 100 ° C.
In the case of, the softening point of the fiber may be 140 ° C. or higher,
If the bonding start temperature of the heat bonding layer is 150 ° C., the softening point of the fiber may be 190 ° C. or higher. If this temperature difference is smaller than 40 ° C., the nonwoven fabric will be damaged by heat at the time of heating and bonding, and the printing density when printing with an ink jet printer will be one step lower.

The fiber diameter of the fibers constituting the nonwoven fabric used in the present invention is 0.8 denier or less, and desirably 0.1 denier or more. When the fiber diameter exceeds 0.8 denier, the stiffness at the time of heat bonding decreases, but the adhesive strength itself tends to decrease. Further, when the fiber diameter is smaller than 0.1 denier, the roughness at the time of heat bonding is reduced, but the texture of cloth tends to be impaired.

The nonwoven fabric used in the present invention is roughly classified into
There is a wet nonwoven fabric, a dry nonwoven fabric by a stitch bond method, a spun bond method, a melt blown method, a thermal bond method, or the like, or a spunlace nonwoven fabric using a wet nonwoven fabric or a dry nonwoven fabric. Preferably, a wet nonwoven fabric or a spunlace nonwoven fabric using the wet nonwoven fabric is used. In the case of a dry nonwoven fabric or a spunlace nonwoven fabric using the dry nonwoven fabric, the range of the basis weight distribution is wide, so that the ink jet print density varies from place to place.

In order to produce the ink jet recording sheet of the present invention, it is necessary to impart ink receptivity to the nonwoven fabric. What is necessary is just to impregnate or coat the nonwoven fabric with the ink receiving component. The means include various blade coaters, roll coaters, air knife coaters, bar coaters, rod blade coaters, short dwell coaters, comma coaters, die coaters, reverse roll coaters,
Kiss coater, dip coater, curtain coater,
Extrusion coater, gate roll coater,
Coating devices such as a gravure coater, a microgravure coater, a size press, and a tab size press can be used.

Preferably, a nonwoven fabric is impregnated with the ink receptive component using a coating device such as a size press. Although it was not expected at the beginning, it was found that excellent printing can be performed much better than providing a coating layer of the ink receiving component on only one side of the nonwoven fabric.

In the ink jet recording sheet of the present invention, the coating amount of the ink receiving component is not particularly limited, but is preferably 5 g / m ² or more and 50 g / m ² or less, more preferably 10 g / m ² or more. It is 40 g / m ² or less. When the coating amount is less than 5 g / m ² , the ink absorbing ability is reduced and a tendency to cause bleeding is observed. On the other hand, when the coating amount exceeds 50 g / m ² , the ink-receiving component is thick and covers the surface of the nonwoven fabric, so that the powder of the ink-receiving component tends to be more conspicuous.

One or more known white pigments can be used in the ink receiving component used in the present invention. For example, light calcium carbonate, heavy calcium carbonate, kaolin, talc, calcium sulfate, barium sulfate, titanium dioxide, zinc oxide, zinc sulfide, zinc carbonate, satin white, aluminum silicate, diatomaceous earth, calcium silicate,
White inorganic pigments such as magnesium silicate, synthetic amorphous silica, colloidal silica, colloidal alumina, pseudoboehmite, aluminum hydroxide, alumina, lithopone, zeolite, hydrohaloysite, magnesium carbonate, magnesium hydroxide, styrene-based plastic pigment, and acrylic Organic pigments such as plastic pigment, polyethylene, microcapsules, urea resin, and melamine resin. Among the above, as the white pigment contained as the main component in the ink receiving component, a porous inorganic pigment is preferable, and porous synthetic amorphous silica, porous magnesium carbonate, porous alumina, and the like, and particularly, Large volume porous synthetic amorphous silica is preferred.

The ink receiving component of the present invention may contain a cationic dye fixing agent. Examples of the cationic dye fixing agent include secondary amines, tertiary amines, and quaternary ammonium salts. These cationic dye fixing agents include a water-soluble direct dye, which is a dye component of an aqueous ink in an ink receiving component, and a water-soluble dye. To form an insoluble salt with the sulfonic acid group, carboxyl group, amino group, etc. in the acidic acid dye, the dye is captured by the ink receiving component, and water is dropped and moisture is absorbed by improving color and forming an insoluble salt. Of the ink and the bleeding of the ink can be suppressed, and the water resistance can be improved.

The adhesive used in the ink receiving component of the present invention includes, for example, polyvinyl alcohol, vinyl acetate, oxidized starch, etherified starch, cellulose derivatives such as carboxymethylcellulose, hydroxyethylcellulose, casein, gelatin, soybean protein. Conjugated diene copolymer latex such as styrene-butadiene copolymer and methyl methacrylate-butadiene copolymer; polymer or copolymer of acrylic acid ester and methacrylic acid ester; acrylic acid and methacrylic acid Acrylic polymer latex such as acid polymer or copolymer; Vinyl polymer latex such as ethylene-vinyl acetate copolymer; or functional group based on functional group-containing monomer such as carboxyl group of these various polymers Modified polymer latte Box; melamine resins, water-based adhesives of thermosetting synthetic resin such as a urea resin; polymethyl methacrylate, polyurethane resin, unsaturated polyester resin,
Synthetic resin-based adhesives such as vinyl chloride-vinyl acetate copolymer, polyvinyl butyral, and alkyd resin can be used, and one or more kinds are used.

Further, other additives include a pigment dispersant, a thickener, a flow improver, an antifoaming agent, a foam inhibitor, a release agent,
Inks with foaming agents, penetrants, coloring dyes, coloring pigments, fluorescent whitening agents, ultraviolet absorbers, antioxidants, preservatives, anti-binders, water-proofing agents, wet strength agents, dry strength agents, etc. It can also be appropriately compounded in the receiving layer.

After imparting the ink receptivity to the nonwoven fabric, flattening may be performed using a calendar such as a machine calender, a TG calender, a super calender, and a soft calender.

[0040]

EXAMPLES The present invention will be described below with reference to examples of the present invention, but the present invention is not limited to these examples. In Examples and Comparative Examples, "parts" and "%"
Represents parts by weight and% by weight unless otherwise specified.

[Preparation of Nonwoven Fabric] An aqueous slurry comprising 95 parts of polypropylene fiber having a fiber diameter of 0.1 denier (softening point: 140 ° C.) and 5 parts of hot water-soluble polyvinyl alcohol fiber (2 denier, fiber length 3 mm) is prepared. Then, a wet nonwoven fabric having a basis weight of 70 g / m ² was formed using a wet papermaking method.
After making the non-woven fabric, the water pressure on both sides is 100 kg / cm ² ,
Water jet treatment at a speed of 20 m / min.
It was dried at 0 ° C. to obtain a nonwoven fabric 1 used in the present invention. In addition,
The hot water-soluble polyvinyl alcohol fiber flows out by the water jet treatment and does not remain in the produced nonwoven fabric.

[Preparation of Ink Receiving Component Liquid] 100 parts of synthetic amorphous silica (Nipsil RS150: manufactured by Nippon Silica Industry Co., Ltd.), polyvinyl alcohol (PVA1)
17: Kuraray Co., Ltd.) 30 parts, cationic dye fixing agent (Sumireze resin 1001: Sumitomo Chemical Co., Ltd.)
Using 20 parts, this was prepared and used as an ink receiving component liquid having a solid content concentration of 13%.

[Preparation of Recording Sheet] The ink receiving component liquid was applied to one surface of the nonwoven fabric 1 using a comma coater.
The coating was performed so as to be 0 g / m ² and dried to obtain a recording sheet 1.

Example 1 A vinylidene chloride copolymer resin (Saran Latex L11) was coated on the opposite side of the surface of the recording sheet coated with the ink receiving component liquid.
1. Adhesion start temperature: 100 ° C., manufactured by Asahi Kasei Kogyo Co., Ltd.) is applied with an air knife coater so that the dry coating amount is 15 g / m ² , dried, provided with a heat-adhesive layer, and heat-adhesive mold of the present invention. A recording sheet was obtained. The softening point (140 ° C) of the fibers constituting the nonwoven fabric is the bonding start temperature (100 ° C) of the heated adhesive layer.
40 ° C higher.

Example 2 Example 1 was repeated except that the fibers constituting the nonwoven fabric were changed to acrylic fibers having a fiber diameter of 0.2 denier (softening point: 190 ° C.).
In the same manner as in the above, a heat-adhesive recording sheet of the invention was obtained. The softening point (190 ° C.) of the fibers constituting the nonwoven fabric is 90 ° C. higher than the bonding start temperature (100 ° C.) of the heated adhesive layer.

Example 3 The heat bonding type of the present invention was carried out in the same manner as in Example 1 except that the fiber constituting the nonwoven fabric was changed to a polypropylene fiber having a fiber diameter of 0.8 denier (softening point: 140 ° C.). A recording sheet was obtained. The softening point of the fibers constituting the nonwoven fabric (140
° C) is 40 times higher than the bonding start temperature (100 ° C) of the heated adhesive layer.
° C higher.

Example 4 The heat bonding type of the present invention was carried out in the same manner as in Example 1 except that the fiber constituting the nonwoven fabric was changed to a polypropylene fiber having a fiber diameter of 1.0 denier (softening point: 140 ° C.). A recording sheet was obtained. The softening point of the fibers constituting the nonwoven fabric (140
° C) is 40 times higher than the bonding start temperature (100 ° C) of the heated adhesive layer.
° C higher.

Example 5 The heat bonding type of the present invention was carried out in the same manner as in Example 1 except that the fiber constituting the nonwoven fabric was changed to an acrylic fiber having a fiber diameter of 0.08 denier (softening point: 190 ° C.). A recording sheet was obtained. Softening point of fibers constituting nonwoven fabric (190 ° C)
Is 90 ° C. higher than the bonding start temperature (100 ° C.) of the heated adhesive layer.

Example 6 The heat-adhesive layer of the heat-adhesive recording sheet obtained in Example 1 and a high-quality paper of 100 g / m ² were overlapped and adhered to each other.
The laminated recording paper of the present invention was obtained by being integrated by heating at 130 ° C.

Example 7 The heat-adhesive layer of the heat-adhesive recording sheet obtained in Example 1 and a postcard made by government were superposed and adhered to each other, and heated at 130 ° C. to be integrated to obtain a laminated postcard of the present invention. Obtained.

Comparative Example 1 The procedure of Example 1 was repeated except that the vinylidene chloride copolymer resin was changed to a modified ethylene / vinyl acetate copolymer resin (Aquatex EC1200, manufactured by Chuo Rika Kogyo Co., Ltd., bonding start temperature: 110 ° C.). A heat-adhesive recording sheet was obtained. The softening point (140 ° C.) of the fibers constituting the nonwoven fabric is higher by 30 ° C. than the bonding start temperature (110 ° C.) of the heated adhesive layer.

Comparative Example 2 The procedure of Example 3 was repeated except that the vinylidene chloride copolymer resin was changed to a modified ethylene / vinyl acetate copolymer resin (Aquatex EC1200, manufactured by Chuo Rika Kogyo Co., Ltd., bonding start temperature: 110 ° C.). A heat-adhesive recording sheet was obtained. The softening point (140 ° C.) of the fibers constituting the nonwoven fabric is higher by 30 ° C. than the bonding start temperature (110 ° C.) of the heated adhesive layer.

Comparative Example 3 The procedure of Example 4 was repeated except that the vinylidene chloride copolymer resin was changed to a modified ethylene / vinyl acetate copolymer resin (Aquatex EC1200, manufactured by Chuo Rika Kogyo Co., Ltd., bonding start temperature: 110 ° C.). A heat-adhesive recording sheet was obtained. The softening point (140 ° C.) of the fibers constituting the nonwoven fabric is higher by 30 ° C. than the bonding start temperature (110 ° C.) of the heated adhesive layer.

Comparative Example 4 The heating adhesive layer of the heat-adhesive recording sheet obtained in Comparative Example 1 and a high-quality paper of 100 g / m ² were overlapped and brought into close contact with each other.
It was integrated by heating at 130 ° C. to obtain a laminated recording paper.

<Test Method> 1) Print density before lamination Examples and Comparative Examples (Excluding Examples 6, 7 and Comparative Example 4)
After cutting the recording sheet prepared in the above step into a postcard size, solid printing of 100% each of black, cyan, magenta and yellow is performed by an ink jet printer (MJ-830J manufactured by Epson). The density of the printed area was measured by Macbeth RD919. Larger values indicate higher print density and better printability.

2) Print density after bonding Examples and Comparative Examples (Excluding Examples 6, 7 and Comparative Example 4)
The heated adhesive layer of the recording sheet prepared in step 1 and the high-quality paper of 100 g / m ² are overlapped and adhered to each other, and integrated by heating at 130 ° C., and then cut into a postcard-sized laminated sheet and a postcard-sized. 100% solid printing of each color of black, cyan, magenta and yellow is performed on the laminated recording papers of Example 6 and Comparative Example 4 and the laminated postcard of Example 7 with an ink jet printer (MJ-830J manufactured by Epson). The density of the printed area was measured by Macbeth RD919.
Larger values indicate higher print density and better printability.

3) Unevenness 1) The recording sheet printed in the print density test before bonding is visually observed to make a judgment. Those having no apparent roughness were judged to be excellent, those having a slight roughness but not so large as a problem were judged as bumpy, and those having a large roughness on the surface were judged to be poor.

4) Texture Examples and Comparative Examples (Excluding Examples 6, 7 and Comparative Example 4)
The heated adhesive layer of the recording sheet prepared in step 1 and the high-quality paper of 100 g / m ² are overlapped and adhered to each other, and integrated by heating at 130 ° C., and then cut into a postcard-sized laminated sheet and a postcard-sized. A landscape photograph was printed on the laminated recording paper of Example 6 and Comparative Example 4 and the laminated postcard of Example 7 with an ink jet printer (MJ-830J manufactured by Epson), and then the texture was visually observed. If the fabric-like texture remains, the texture is excellent.If the film is slightly film-like but no clear heat damage is seen, the texture is lined up, and heat damage such as discoloration and melting can be seen. Was judged to be inferior in texture.

5) Adhesion Example and Comparative Example (Excluding Examples 6 and 7 and Comparative Example 4)
The heated adhesive layer of the recording sheet prepared in step ^{2 and} the high-quality paper of 100 g / m ² are overlapped and adhered to each other, integrated by heating at 130 ° C., and then cut into a 25 mm width and a laminated recording sheet cut into a 25 mm width. After the bonded recording papers of Example 6 and Comparative Example 4 and the bonded postcard of Example 7 were aged for one day, the adhesive strength was measured with a Tensilon universal tensile tester. The tensile strength (adhesive strength) is 200 gf /
If it is 25 mm or more, it can be said that lamination that does not hinder practical use has been completed.

[0060]

[Table 1]

[0061]

[Table 2]

Evaluation: The difference in print density of 0.1 or more can be regarded as a sufficiently significant difference visually.
That is, as is clear from Table 1, the printing density of the heat-bondable recording sheet of the present invention is improved by using a fiber constituting the nonwoven fabric whose softening point is 40 ° C. or higher than the bonding start temperature of the heat-bonding layer. You can see that it is. Also,
The unevenness during heat bonding is further improved by setting the fiber diameter of the fibers constituting the nonwoven fabric to 0.8 denier or less and 0.1 denier or more.

Further, from Table 2, it can be seen that the heat-bondable recording sheet of the present invention is heat-bonded without impairing the feeling. Further, the fiber diameter of the fibers constituting the nonwoven fabric is set to 0.
It is understood that the heat-adhesive recording sheet of the present invention can be used without impairing the adhesiveness and texture by setting the denier to 8 denier or less and 0.1 denier or more.

[0064]

By using the heat-adhesive recording sheet of the present invention, it is possible to print a printed image having a sufficient print density, and to adhere it to high-quality paper or a postcard manufactured by government without any unevenness during heat bonding. It is effective because it can give a surprising impression to the viewer.

Continued on the front page F-term (reference) 2C005 WA01 WA15 2H086 BA05 BA21 BA22 BA41 4F100 AK07 AK16 AK21 AL01 BA02 BA03 BA07 BA10A BA10C DG01A DG10C DG15A EC18 EH46A EJ42 EJ82A GB90 JA04A JA20B JD14A JA17 AG03A55A37A37 BD16 BE08 BE10 EA16 EA20 FA14 FA15 GA09 GA42 GA50

Claims (4)

[Claims] 1. A heat-adhesive recording sheet comprising a non-recording surface of a non-woven fabric coated or impregnated with an ink-receiving component, which is provided with a heat-adhesive layer which exhibits neither adhesiveness nor adhesiveness when heated and exhibits adhesiveness when heated. 3. The heat-adhesive recording sheet according to claim 1, wherein the softening point of the fibers constituting the nonwoven fabric is higher by 40 ° C. or more than the bonding start temperature of the heat-adhesive layer. 2. The fiber constituting the nonwoven fabric has a fiber diameter of 0.1.
The heat-adhesive recording sheet according to claim 1, wherein the recording density is 8 denier or less and 0.1 denier or more. 3. A laminated recording sheet wherein a heat-adhesive recording sheet and high quality paper are adhered by heating. 4. The laminated postcard according to claim 3, wherein the high-quality paper is an official postcard.