JPH10232616A - Adhesive recording sheet - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain ink jet printer passableness and to easily position and stick the sheet on another form such as an official postcard before or after ink jet recording by forming >=1 receiving layer on one surface of a synthetic resin sheet and providing a specific thermal adhesion layer on the other surface. SOLUTION: This sheet has at least one receiving layer on one surface of the synthetic resin sheet and is provided with the thermal adhesion layer in one kind of type among heat sealing, hot-melting, and delayed tacking which is normally neither sticky nor adhesive and becomes sticky or adhesive when heated on the other surface. The synthetic resin sheet having the ink receiving layer needs to originally has a sticking function and also to be stuck on another base before or after ink jet printing without spoiling ink jet recordability. This adhesive recording sheet 12 requires no intervention of a solvent or menstrum such as glue and an adhesive, so the ink jet recordability is not spoiled.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ink jet recording sheet having an ink receiving layer capable of ink jet recording and other adherends, such as high quality paper, coated paper, nonwoven fabric, synthetic resin sheet, glass, metal and the like. The present invention relates to a bonding type recording sheet which can be bonded, and particularly to a heat bonding type recording sheet which allows prepaid postcards and bonding and posting, and a bonded postcard, a window envelope and a double-sided recording sheet using the same. Things.

[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 sheet having a dedicated ink receiving layer of an ink jet recording system is indispensable. Further, the demand for surface smoothness, glossiness, and durability after inkjet recording has necessitated the use of synthetic resin sheets other than high-quality paper and coated paper.

[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 message are ink-jet recorded on both sides. There is also a demand for recording sheets that can be recorded on both sides. But,
When double-sided ink jet recording is performed on a general non-coat type ink jet recording sheet, the problem of swelling of the opposite side caused by ink seepage when recording on one side, and deterioration of recording visibility due to strikethrough of the ink on the opposite side. ,
More fundamentally, when an ink jet recording sheet having an ink receiving layer on both sides is produced, the solvent in the coating layer seeps into the base paper more than when the ink jet recording sheet has an ink receiving layer on only one side. However, there has been a problem that the curl property is deteriorated and the curl property is poor, so that it is impossible to respond to the demand for advanced properties. Synthetic resin-based ink-jet recording sheets do not seep into the ink, but do not have the cushioning properties of paper, so the ink-receiving layer is easily damaged by rolls on printers, making it difficult to obtain good images on both sides. Met.

[0005] In addition, when such a recording paper that is capable of ink jet recording on both sides is used for a postcard, a normal government-made postcard, a prepaid postcard with a lottery number (a postcard with a new year's card, a postcard for a summer visit with a lottery) may be used. And postcards cannot be used, so it is not possible to use lottery opportunities and the utility value is low.Also, although the fee is the same as for government-made postcards, it is necessary to attach stamps, and postal code frames, mail A postcard or similar description must be provided 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] Since the surface of the postcard has a certain degree of ink receptivity for ink-jet recording, the problem of using the ink-jet recording and the postcard by integrating the ink-jet recorded recording sheet and the postcard made by glue or an adhesive. Both can be compatible, but when glue or adhesive is applied to the back side of the recording paper after inkjet recording and pasted to a government-made postcard, the inkjet recording part will bleed due to moisture or solvent contained in the glue or adhesive. There are problems such as curling and undulation after lamination.

Further, in recent years, the use of envelopes in which only the address portion of a postal matter has a transparent film attached thereto, so-called window-opened envelopes, has increased the number of postal-related products such as eliminating the need to write the address on the envelope. I have. If you enter a bar code symbol for the address part from 1998, there are benefits such as a discount on postage, but conventional window films cannot add bar codes, etc. There is a problem that the suitability for pasting is poor.

[0008]

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide an ink jet recording sheet having high ink receptivity, image quality, surface smoothness, glossiness, and ink jet printer paper passing property. After or before inkjet recording, it is possible to easily align and attach to other papers such as government-made postcards before or after recording. It is intended to provide a recording sheet that does not impair. further,
It is an object of the present invention to provide a recording sheet having good sticking aptitude while maintaining internal transparency when used in a window envelope or the like, and further having ink jet recording properties.

[0009]

Means for Solving the Problems The inventors of the present invention have conducted intensive studies to solve the above problems, and as a result, have reached the following invention. That is,

[0010] One side of the synthetic resin sheet has at least one or more ink receiving layers, and the other side has tackiness in a normal state,
A heat-adhesive recording sheet provided with a heat-sensitive adhesive layer comprising any one of heat seal, hot melt, and delayed tack, which exhibits adhesiveness or adhesiveness when heated without exhibiting adhesiveness.

[0011] A recordable window-open envelope, wherein the heat-adhesive recording sheet described above is used for a window, and ink-jet recording can be performed on the window after bonding.

Heat-seal, which has at least one or more ink-receiving layers on the synthetic resin surface of the synthetic resin-laminated paper, and has no tackiness or adhesiveness in a normal state but exhibits tackiness or adhesiveness when heated on the other surface; A heat-adhesive recording sheet provided with a heat-sensitive adhesive layer made of one of hot melt and delayed tack.

[0013] A laminated recording sheet characterized in that the above-mentioned heat-adhesive recording sheet or the heat-adhesive recording sheet is adhered to the adherend by heating.

The bonded postcard is characterized in that the adherend described above is an official postcard.

Two sheets of the above-mentioned heat-adhesive recording sheet or heat-adhesive recording paper, which are formed by laminating the heat-sensitive adhesive layers;
Or 1 which is folded so that the heat-sensitive adhesive layer is overlaid
A double-sided recording sheet, wherein two recording sheets are integrated by heating.

The above-mentioned heat-adhesive recording sheet or heat-adhesive recording paper is heated at a temperature lower by at least 10 ° C. than the melting point of the synthetic resin sheet or the synthetic resin laminated paper constituting the heat-adhesive recording sheet, and the other heat-adhesive recording sheets are heated. A method for producing a laminated recording sheet, characterized by adhering to a support.

[0017]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail.
In the present invention, both ease of use of the recording sheet finally used and high ink jet recording performance are achieved by laminating a synthetic resin sheet having an ink receiving layer to another support. What is important here is that the synthetic resin sheet having the ink receiving layer originally has a laminating function, without impairing the image quality of the ink jet recording already performed by the laminating step or the ink jet recording property for performing the ink jet recording from now on. That is, it can be bonded to another support. That is, since no solvent or solvent such as glue or adhesive is interposed in the laminating step, ink jet recording properties are not impaired.

The synthetic resin sheet of the present invention is a biaxial sheet of a synthetic resin such as polyethylene, polypropylene, polyethylene terephthalate, polyester, polyamide, polycarbonate, vinylon, polyvinyl alcohol, nylon, polyvinyl chloride, polyvinylidene chloride, and polymethylpentene. Translucent 2 with reduced transparency by containing pigments, foaming agents, etc. in stretched sheets and their synthetic resins
It shows an axially stretched synthetic resin sheet, a synthetic paper or a nonwoven fabric made of these synthetic resins, or a laminated paper in which these synthetic resins are laminated on paper on one side or both sides.
When providing an ink receiving layer on the synthetic resin sheet of the present invention,
The ink receiving layer may be provided on the synthetic resin sheet as it is, or may be subjected to surface treatment such as corona treatment, frame treatment, plasma treatment, ultraviolet irradiation treatment, or provided with an anchor coat layer of starch, polyvinyl alcohol, etc., and then provided with the ink receiving layer. May be provided as a multi-layered ink receiving layer.

When the ink receiving layer is provided, it can be provided on the entire surface or a part of one surface of the recording sheet. The coating amount is not particularly limited. However, if it is too small, a problem occurs in ink absorbency. In addition, the image density, color, and sharpness are low, and the ink is diffused in the surface direction of the synthetic resin sheet to cause deterioration of a dot shape called feathering, which is jagged like a bird feather. In addition, if the coating amount is too large, the drying load in the drying step after coating or impregnation increases, and not only does the productivity decrease due to the decrease in the coating or impregnation speed, but also when drying under a high load, the ink receiving layer The binder in the coating composition constituting (1) moves to the surface of the ink receiving layer together with the solvent that evaporates, and reduces the amount of voids on the surface. The problem which occurs in the ink receiving layer having a large coating amount depends on the concentration of the coating composition and the ability of the drying step, but is preferably 1 to 10 g / m ² .

In the ink receiving layer used in the present invention, one or more known pigments can be used. 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, magnesium silicate, synthetic non-crystalline Inorganic pigments such as crystalline silica, colloidal silica, colloidal alumina, pseudoboehmite, aluminum hydroxide, alumina, lithopone, zeolite, hydrohaloysite, magnesium carbonate, magnesium hydroxide,
Styrene plastic pigment, acrylic plastic pigment, polyethylene, microcapsule,
Organic pigments such as urea resin and melamine resin are exemplified. Among the above, as the pigment contained as the main component in the ink receiving layer, a porous inorganic pigment is preferable, and porous synthetic amorphous silica, porous magnesium carbonate, porous alumina, and the like can be mentioned, and in particular, pore volume Is preferred. These pigments are

Among the above-mentioned inorganic pigments, it is particularly preferable to use synthetic amorphous silica, and a recording sheet having excellent print density, ink absorbency, sharpness of a printed image, and the like can be obtained. Such synthetic amorphous silica is described in, for example, JP-A-57-157786 and JP-A-61-141.
Nos. 584, 61-230979 and 62-
As described in JP-A-292476 and the like, it is a microporous, irregular fine particle having a three-dimensional structure of SiO ₂ formed by gelling of silicic acid, and has a Hunter whiteness of 90 or more and a pore diameter of 10 to 10. It has about 2000 angstroms.

As such a synthetic amorphous silica, a commercially available one can be suitably used. For example, Mizukasil P-
526, Mizukacil P-801, Mizukasil NP-8,
Mizukacil P-802, Mizukasil P-802Y, Mizukasil C-212, Mizukacil P-73, Mizukacil P
-78A, Mizukacil P-78F, Mizukacil P-8
7, Mizukacil P-705, Mizukasil P-707, Mizukasil P-707D, Mizukasil P-709, Mizukasil C-402, Mizukasil C-484 (all manufactured by Mizusawa Chemical), Toksil U, Toksil UR, Toksil G
U, Toksil AL-1, Toksil GU-N, Toksil N, Toksil NR, Toksil PR, Solex, Fine Seal E-50, Fine Seal T-3
2, Fine Seal X-37, Fine Seal X-7
0, Fine Seal RX-70 Fine Seal A, Fine Seal B (all manufactured by Tokuyama Soda), Carplex FPS-101, Carplex CS-7, Carplex 80, Carplex XR, Carplex 67
(The above are manufactured by Shionogi & Co., Ltd.), Syloid 63, Syloid 65, Syloid 66, Syloid 77, Syloid 7
4, thyroid 79, thyroid 404, thyroid 6
20, thyroid 800, thyroid 150, thyroid 244, and thyroid 266 (all manufactured by Fuji Silysia Chemical Ltd.).

In the recording sheet of the present invention, as the binder resin, for example, polyvinyl alcohol, silanol-modified, carboxyl-modified, or the like is used for the purpose of improving the adhesion between the inorganic pigments and the ink-receiving layer and the synthetic resin sheet or improving the productivity. Various modified polyvinyl alcohols such as thiol-modified, vinyl acetate, oxidized starch, etherified starch, cellulose derivatives such as carboxymethylcellulose, hydroxyethylcellulose, casein, gelatin, soybean protein, silyl-modified polyvinyl alcohol, etc .; maleic anhydride resin, styrene-butadiene Copolymers, conjugated diene-based copolymer latex such as methyl methacrylate-butadiene copolymer; acrylate and methacrylate polymers or copolymers;
Acrylic polymer latex such as polymer or copolymer of acrylic acid and methacrylic acid; vinyl polymer latex such as ethylene vinyl acetate copolymer; or functional group-containing monomer such as carboxyl group of these various polymers Functional group modified polymer latex; thermosetting synthetic resin such as melamine resin and urea resin; aqueous adhesive; polymethyl methacrylate, polyurethane resin, unsaturated polyester resin, vinyl chloride-vinyl acetate copolymer, polyvinyl butyral, alkyd One or more synthetic resin adhesives such as resins can be used alone or in combination. In addition, the use of a known natural or synthetic resin binder alone or in combination is not particularly limited.

Further, other additives include a cationic dye fixing agent, a thickener, a flow improver, an antifoaming agent, a foam inhibitor, a release agent, a foaming agent, a penetrant, a coloring dye, a coloring pigment, Fluorescent whitening agents, ultraviolet absorbers, preservatives, anti-binders, waterproofing agents, wet paper strength enhancers, dry paper strength enhancers, antioxidants, and the like can also be added as appropriate.

The method for coating the base paper of the present invention with an ink receiving layer includes various blade coaters, roll coaters, spray coats, transfer coats, air knife coaters, bar coaters, rod blade coaters, short dwell coaters, size presses, and the like. Can be used on-machine or off-machine. After coating or impregnation, machine calendar, TG calendar,
The finishing may be performed using a calendar such as a super calendar or a soft calendar.

The ink used in the present invention includes the following colorants:
This is a recording liquid composed of a liquid medium and other additives.

Examples of the colorant include water-soluble dyes such as direct dyes, acid dyes, basic dyes, reactive dyes, and food dyes.

Examples of the solvent for the ink include water and various water-soluble organic solvents such as methyl alcohol, ethyl alcohol, n-propyl alcohol, isopropyl alcohol, n-butyl alcohol, sec-butyl alcohol, tert-butyl alcohol, and isobutyl. Alkyl alcohols having 1 to 4 carbon atoms such as alcohol; amides such as dimethylformamide and dimethylacetamide; ketones or ketone alcohols such as acetone and diacetone alcohol; ethers such as tetrahydrofuran and dioxane; polyethylene glycol and polypropylene glycol Polyalkylene glycols; ethylene glycol, propylene glycol, butylene glycol, triethylene glycol, 1,2,6-hexanetriol, thiodiglyco Le, hexylene glycol,
Alkylene glycols having 2 to 6 alkylene groups such as diethylene glycol; and lower alkyl ethers of polyhydric alcohols such as glycerin, ethylene glycol methyl ether, diethylene glycol methyl (or ethyl) ether, and triethylene glycol monomethyl ether. Among these many water-soluble organic solvents, polyhydric alcohols such as diethylene glycol, and lower alkyl ethers of polyhydric alcohols such as triethylene glycol monomethyl ether and triethylene glycol monoethyl ether are preferable. Other additives include, for example, a pH adjuster, a metal sequestering agent, a fungicide, a viscosity adjuster, a surface tension adjuster, a wetting agent, a surfactant, and a rust preventive.

The heat seal coating agent constituting the heat seal layer used in the present invention is "All about Converting" (published by Processing Technology Research Institute, 1993, p. 3).
These are so-called heat seal coating agents in a narrow sense as described in (51) to (5) and are different from solventless hot melt coating resins. 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 coated and dried as a solvent solution or as an emulsion.

The resin constituting the delayed tack layer used in the present invention includes acrylic resin, vinyl chloride resin, vinyl acetate resin, styrene / acryl copolymer resin, styrene / butadiene copolymer resin, polystyrene resin, A polyamide resin is exemplified. The resin has 1
One or several crystalline (solid) plasticizers such as dicyclohexyl phthalate, diphenyl phthalate, N-
Cyclohexyl-p-toluenesulfonamide, o / p
-Contains toluenesulfonamide and the like. 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 delayed tack layer of the present invention is characterized by containing a pigment (organic or inorganic) corresponding to 3 to 50% of the solid content. As the pigment, silica, kaolin, clay, calcium carbonate, aluminum hydroxide, titanium oxide, zinc oxide, melamine resin particles, benzoguanamine resin particles, starch particles and the like can be used alone or in combination. By including a certain amount of pigment in the delayed tack layer, it is possible to significantly improve printer paper-passing properties and improve the image quality of the ink receiving layer without adhesion when recording sheets are superimposed. found. When the ink receiving layer is in direct contact with the latent but tacky delayed tack layer, the phenomenon that a part of the component migrates to the ink receiving layer and reduces the ink receiving ability is less likely to occur. It is thought to be. If the mixing ratio of the pigment is smaller than the above range, the printer paper passing property and the image quality are not so good, and even if the pigment is present beyond the above range, it is difficult to apply, but rather the image quality deteriorates. It became clear that it was done.

The resin constituting the hot melt layer used in the present invention is generally a thermoplastic material (100% solid) which melts in a temperature range of 60 ° C. to 180 ° C., and includes the following polymers, resins and waxes. Is used. Alkyd (modified polyester), asphalt and coal tar bluish blue, cumarone-indene resin,
Rosin and its derivatives, terpene resins, waxes (mineral, vegetable and petroleum), ethylene / ethyl acrylate copolymer, ethylene / vinyl acetate copolymer, polyethylene, polyvinyl acetate and its copolymers, polycarbonate, polystyrene and The copolymer, polystyrene and the copolymer, polypropylene, polyvinyl ether, polyamide, polyester (thermoplastic), phenoxy resin (plasticized), polyisoprene, polyurethane,
A resin such as a thermoplastic elastomer (SBS, SIS, SEBS, etc.) is used.

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. By mixing the pigment in the hot melt layer in a certain range, the printer paper passability can be significantly improved and the image quality of the ink receiving layer can be improved without adhesion when the recording sheets are superimposed. found. This means that when the ink receiving layer is in direct contact with the latent but sticky hot melt layer, the phenomenon that a part of the components migrate to the ink receiving layer and reduce the ink receiving ability is less likely to occur. It is thought to be. When the mixing ratio of the pigment is smaller than the above range, the printer paper passing property and the image property are not so good, and even if the pigment is present beyond the above range, it is only difficult to apply, and the image property is rather deteriorated. It became clear.

The heat seal layer, delayed tack layer and hot melt layer (hereinafter collectively referred to as a heat-sensitive adhesive layer) of the present invention may have a maximum of 50 for the purpose of improving printer suitability, suppressing blocking and improving adhesiveness. It is possible to contain up to% by weight of pigment. As the pigment, an appropriate pigment can be selected from the pigments described as the pigments that can be contained in the ink receiving layer in consideration of the particle size, dispersibility, melting point, and the like.

In the heat-sensitive adhesive layer of the present invention, other additives such as a dispersant, a thickener, a fluidity improver, an antifoaming agent, a foam inhibitor, a release agent, a foaming agent, a penetrant, and a coloring agent. Dyes, coloring pigments, fluorescent brighteners, ultraviolet absorbers, antioxidants, preservatives, anti-binders, water-proofing agents, wet paper strength agents, dry paper strength agents, antistatic agents, anti-aging agents, etc. They can be appropriately blended.

The coating amount of the heat-sensitive adhesive layer varies depending on the bonding method, but is preferably in the range of 5 to 40 g / m ^{2 for} the purpose of ensuring good adhesiveness and ink jet recording properties. When the coating amount of the heat-sensitive adhesive layer is smaller than this range, the bonding is weak due to insufficient adhesiveness. If it is larger than this range, it not only hinders the running of the paper but also causes a cost increase economically.

The method for applying the heat-sensitive adhesive layer of the present invention includes, for example, a gravure coater, a gravure offset coater, a bar coater, a roll coater, an air knife coater, a U comma coater, an AKKU coater, a smoothing coater, a microgravure coater, and a reverse coater. Roll coater, 4 or 5 roll coater, blade coater, dip coater, drop curtain coater, slide coater, die coater, melt extrusion die, etc. Any coating method considering the form and suitability of the resin constituting the adhesive layer. May be used.

When the recording sheet of the present invention is bonded to another adherend, ie, high-quality paper, coated paper, nonwoven fabric, synthetic resin sheet, glass, metal, or the like via the heat-sensitive adhesive layer,
After the recording sheet and the adherend are overlaid, they can be bonded together by heating and pressing from the ink receiving layer side or from the adherend side. In this step, it is necessary that the heating temperature is lower than the melting point of the synthetic resin sheet constituting the recording sheet, and further, it is 10 ° C. lower than the melting point of the synthetic resin sheet.
By heating at a low temperature or more, it can be adhered to the adherend, good ink jet recording properties, image properties, smoothness,
It is more preferable to maintain gloss. Naturally, the heat-sensitive adhesive layer needs to be activated (melted or tackified) at a temperature lower than the melting point of the synthetic resin sheet by 10 ° C. or more. For controlling the melting point of the heat-sensitive adhesive layer, a melting point depressant or the like can be used in combination.

In the recording sheet having the heat-sensitive adhesive layer of the present invention, a penetration preventing layer may be provided in contact with the base paper for the purpose of further preventing the resin forming the heat-sensitive adhesive layer from penetrating into the base paper. The role of the permeation preventing layer is to prevent the resin forming the heat-sensitive adhesive layer from seeping into the base paper and to impart smoothness when the heat-sensitive adhesive layer is provided. The permeation preventing layer that can be used in the present invention can be provided by an aqueous solution or emulsion of a natural polymer or a synthetic resin polymer, and examples thereof include the following substances.

Examples of natural polymers and semi-synthetic polymers include modified starch compounds such as starch, oxidized starch, etherified starch, dialdehyde-modified starch and esterified starch; alginic acid compounds such as sodium alginate and propylene glycol alginate; casein;
Examples include gelatin, pullulan, dextran, chitin, chitosan, gum latex, gum arabic, funori, natural gum, dextrin, modified cellulose compounds such as methylcellulose, ethylcellulose, hydroxycellulose, carboxymethylcellulose, and the like.

Examples of the synthetic resin polymer include completely or partially saponified polyvinyl alcohol, acetoacetylated polyvinyl alcohol, esterified product of polyvinyl alcohol and polycarboxylic acid, carboxy-modified polyvinyl alcohol, and sulfonic acid-modified polyvinyl alcohol. , Olefin-modified polyvinyl alcohol, nitrile-modified polyvinyl alcohol, amide-modified polyvinyl alcohol, modified polyvinyl alcohol compounds such as pyrrolidone-modified polyvinyl alcohol, polyethylene glycol, polyacrylamide, polyacrylic acid,
Examples include polyacrylic acid compounds such as ammonium polyacrylate and sodium polyacrylate, polyvinylpyrrolidone, polyethyleneimine, polyvinyl ether, polymaleic acid copolymer, polyacrylamide, and water-soluble alkyd resin.

Further, an emulsion obtained by dispersing a synthetic polymer such as styrene / butadiene copolymer, butadiene / methacrylate copolymer, acrylonitrile / butadiene / acrylate latex in water can be used.
The above polymers can be used alone or as a mixture, if necessary, in combination with an antifoaming agent, a dispersant and the like. The penetration preventing layer may be formed by melt lamination of polyolefin resin or dry lamination as long as it prevents the resin or solvent from penetrating into the synthetic resin sheet.

The operation of the present invention will be described below. In the recording sheet of the present invention, a heat-sensitive adhesive layer having a printer paper-passing property having an adhesive property by heating or pressurizing which does not have adhesiveness or tackiness in a normal state on the opposite surface of the synthetic resin sheet having an ink receiving layer. By bonding the recording sheet to another synthetic resin sheet (postcard or the like), both the ease of use of the laminated recording sheet to be finally used and good ink jet recording properties can be achieved. Was. What is important here is that the recording paper having the ink receiving layer originally has a laminating function, without impairing the image quality of the ink jet recording already performed by the laminating step or the ink jet recording property for performing the ink jet recording from now on. That is, it can be laminated with another synthetic resin sheet. That is, in the laminating step, a solvent such as a glue or an adhesive or a solvent is not interposed, so that the ink jet recording property is not impaired. The recording sheet of the present invention can be bonded to another adherend by heating before or after inkjet recording, for example, by laminating an inkjet-recorded recording sheet with a government-made postcard or a prepaid postcard with a lottery number, It can be used as a postcard. Further, the transparent heat-adhesive recording sheet of the present invention can be used as a window film of a window opening envelope capable of inkjet recording, and can also be used as a label for food, distribution, and the like.

[0045]

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. Further, “parts” and “%” shown in the examples are parts by weight and% by weight unless otherwise specified.

<Preliminary Operation 1> A polyester film (50 μm, manufactured by Toray, melting point 265) as a synthetic resin sheet
℃), polyethylene film (70μm, Mitsubishi Chemical H
DPE, melting point 130 ° C), polypropylene film (7
0 μm, manufactured by Mitsubishi Chemical Corporation, melting point: 160 ° C.). Each of them was a biaxially stretched film, and the surface thereof was subjected to corona treatment in order to provide the following ink receiving layer.

<Preliminary operation 2> As a synthetic resin laminated paper, low density polyethylene (20 μm, NU manufactured by Nippon Unicar)
C8002 melting point 108 ° C) and high-quality paper (70 g / m ² )
The melt-extruded laminated sheet was used. In order to provide the following ink receiving layer, the surface was subjected to corona treatment before use.

An ink receiving layer coating liquid having the following composition was adjusted as the ink receiving layer so as to have a solid content of 9% while maintaining the temperature at 25 ° C., and the dry coating amount was 3% on each synthetic resin sheet.
Coating was performed using a rod bar so as to be 0 g / m ² .
Subsequently, it was dried with hot air at 110 ° C. for 5 minutes to form an ink receiving layer, thereby obtaining an ink jet recording sheet using a synthetic resin sheet or the like as a support. Hereinafter, a recording sheet using a polyester film may be used as a PE according to the difference between the obtained inkjet recording sheet and a synthetic resin sheet serving as a support.
A T sheet, a recording sheet using a polyethylene film is called a PE sheet, a recording sheet using a polypropylene film is called a PP sheet, and a recording sheet using a synthetic resin laminated paper is called a lami sheet. (Ink receiving layer coating liquid formulation) Alumina hydrate (AS-3, manufactured by Catalyst Chemical Industry) 98.5 parts Polyvinyl alcohol (PVA-126H, average degree of polymerization 2600, manufactured by Kuraray) 1 part Boric acid triesterization reaction Product (Emulphon GB, manufactured by Toho Chemical Industry) 0.5 part

Example 1 A modified ethylene / vinyl acetate copolymer resin (Aquatex EC1200, manufactured by Chuo Rika Kogyo Co., Ltd., solid content 51%) was formed on the opposite side (non-inkjet recording surface) of the PET sheet obtained by the preliminary operation as a heat seal layer. ) Was applied to a solid content of 15 g / m ² and dried under hot air at 80 ° C. for 20 seconds to provide a heat seal layer to obtain a heat sealable heat-sensitive adhesive recording sheet.

Example 2 A heat-sensitive adhesive recording sheet was prepared in the same manner as in Example 1 except that the PET sheet used in Example 1 was changed to a PE sheet.

Example 3 A heat-sealing heat-sensitive adhesive recording sheet was prepared in the same manner as in Example 1 except that the PET sheet used in Example 1 was changed to a PP sheet.

Example 4 A heat-sealing heat-sensitive adhesive recording sheet was prepared in the same manner as in Example 1 except that the PET sheet used in Example 1 was changed to a laminating sheet.

Example 5 The heat-sealing layer of the heat-sealable recording sheet obtained in Example 3 and the high-quality paper of 100 g / m ² were superposed and adhered to each other, and were integrated by heating at 150 ° C. To obtain a laminated recording paper.

Example 6 The heat-sealing layer of the heat-sealable recording sheet obtained in Example 3 was superimposed on and adhered to the postcard made by government, and the laminated post-card was integrated by heating at 150 ° C. Obtained.

Example 7 On the opposite side of the PET sheet obtained in the preliminary operation, a heat-sensitive adhesive (Heat Magic DW20) was used as a delayed tack layer.
00, manufactured by Toyo Ink, solid content 52%), and mixed with wheat starch as a pigment so as to be 3% of the total solid content.
Coating was performed so that the total solid content was 15 g / m ^2, and the coating was dried under warm air at 45 ° C. for 20 seconds to provide a delayed tack layer to obtain a delayed tack heat-bondable recording sheet.

Example 8 The heat-sensitive adhesive layer of the delayed tack heat-bondable recording sheet obtained in Example 7 and a high-quality paper of 100 g / m ² were overlapped and adhered to each other, and were integrated by heating at 150 ° C. To obtain a laminated recording paper.

Example 9 The heat-sensitive adhesive layer of the delayed tack heat-bondable recording sheet obtained in Example 7 and a postcard made by government were superimposed and brought into close contact with each other. Obtained.

Example 10 On the opposite side of the PET sheet obtained in the preliminary operation, a synthetic rubber-based hot-melt adhesive (MU) was used as a hot-melt layer.
74, manufactured by Konishi Co., Ltd.) and spray-cooled to a coating amount of 50 g / m ² , followed by cooling to provide a hot-melt layer to obtain a hot-melt heat-adhesive recording sheet.

Example 11 The heat-sensitive adhesive layer of the hot-melt heat-adhesive recording sheet obtained in Example 10 and a high-quality paper of 100 g / m ² were superposed and adhered to each other, and were integrated by heating at 150 ° C. A laminated recording paper was obtained.

Example 12 The heat-sensitive adhesive layer of the hot-melt heat-adhesive recording sheet obtained in Example 10 and a postcard made by government were superposed and adhered to each other, and heated at 150 ° C. to obtain a laminated postcard. Was.

Comparative Example 1 The PET sheet obtained in the preliminary operation 1 was directly used as a sample of the comparative example. The sample of Comparative Example 1 was subjected to ink-jet recording and then coated with glue on the surface of the non-ink receiving layer and bonded to a high-quality paper. Comparative Example 1A. The laminated sheet was evaluated as Comparative Example 1B. However, only the tests of self-adhesiveness and laminating position controllability were performed before laminating high quality paper.

Comparative Example 2 The laminate sheet obtained in the preliminary operation 2 was used as it was as a sample of the comparative example. The sample of Comparative Example 1 was subjected to ink-jet recording and then coated with glue on the surface of the non-ink receiving layer and bonded to a high-quality paper. Comparative Example 1A. The laminated sheet was evaluated as Comparative Example 1B. However, only the tests of self-adhesiveness and laminating position controllability were performed before laminating high quality paper.

Comparative Example 3 An adhesive (Licabond AP-37, manufactured by Chuo Rika Kogyo Co., Ltd.) was provided as an adhesive layer on the opposite side of the PET sheet obtained in the preliminary operation 1 so as to have a dry weight of 20 g / m ^2. Was covered with a commercially available release paper to obtain an adhesive recording sheet.

Comparative Example 4 An adhesive (Licabond AP-37, manufactured by Chuo Rika Kogyo Co., Ltd.) was provided as an adhesive layer on the opposite side of the lami sheet obtained in Preparatory Operation 2 so as to have a dry weight of 20 g / m ^2. The sheet was covered with a commercially available release paper to obtain an adhesive recording sheet.

The recording sheets obtained in Examples and Comparative Examples were tested by the following methods. The evaluation results are shown in Table 1 for Examples and Table 2 for Comparative Examples.

<Test Method> 1) Suitability for Printer The recording sheets obtained in Examples and Comparative Examples were cut into postcard-sized pieces, and 10,000 color images were printed (inkjet printer: MJ-910C manufactured by Epson).
Was performed, and the suitability for the printer was determined by the total of the number of sheets in which color disturbance due to paper feeding trouble occurred and the number of sheets discharged by jamming. Naturally, the smaller the better, the better, but as a guide, the printer suitability (paper-passing property) is good if the number is up to 30 sheets, and it is within the allowable range if the number is 31 to 50 sheets, and seems to exceed 50 sheets. This is unfavorable because erroneous paper is constantly output. If paper cannot be continuously fed (on average, there is a double feed or paper feed failure of 10 or more sheets), it is described as inappropriate.

2) Printability In the test piece obtained in the test for printer suitability, an ink jet recording portion was observed. There is no bleeding in the ink jet recording part, the printability of the recording sheet with colorful and sharpness is excellent, the printability is moderate when the image is slightly sharp but the image is sufficiently clear, bleeding occurs,
The case where the ink jet recording property was inferior was judged as the poor printing property.

3) Swelling Swelling was visually determined on the recording surface after printing with an ink jet printer. What does not matter in quality is the evaluation of A and B. A: The swell is not recognized, and the appearance is not spoiled. B: The swell is small and does not spoil the aesthetic appearance. C: The undulation is large, and the appearance is impaired.

4) Adhesion of woodfree paper The ink jet recording was carried out on the recording sheets obtained in the examples and comparative examples, and a heating adhesive layer was adhered to woodfree paper having a basis weight of 190 g / m ² , and the paper was ironed with a household iron. After heating (at a temperature lower than the melting point of each synthetic resin by 10 ° C. or more) and laminating for one day, the adhesive strength was measured with a Tensilon universal tensile tester. The bonded recording sheet and the bonded postcard were subjected to ink-jet recording and measured as they were. 200gf / 25m tensile strength (adhesive strength)
If it is not less than m, it can be said that lamination that does not hinder practical use is completed.

5) Print Preservation In the test piece after bonding the high quality paper adhesive, an ink jet recording portion was observed. Excellent print storability on a recording sheet that has the same sharpness as before lamination, with no bleeding in the ink jet recording part, prints when the image is slightly less sharp than before lamination but the image is sufficiently maintained In the case where the storability was average, bleeding occurred, and the ink jet recording properties were poor, the print storability was judged to be poor.

6) Curling properties Single-sided, solid-color, solid-printed recording sheets (laminated recording sheets,
(Including postcards) cut into 10cm square
Curl was measured by standing still on a flat desk under the condition of 65 ° C. and a relative humidity of 65%. The curl is expressed by the average height of the four corners. The curl is excellent when the average curl is less than 3 mm, and the curl is good when the curl is from 3 mm to 7 mm. Therefore, it was determined that the curl property was poor.

7) Self-adhesiveness 1 Ink-jet recording was performed on each of the two adhesive recording sheets (excluding laminated recording paper and laminated postcards) obtained in Examples and Comparative Examples, and the respective adhesive surfaces were measured. The two-sided recording sheet was laminated and adhered to each other, and then heated and integrated with a household iron to obtain a laminated double-sided recording sheet. In Comparative Examples 3 and 4, the release paper was peeled off and bonded. After aging for one day, the adhesive strength was measured with a Tensilon universal tensile tester. If the tensile strength (adhesive strength) is 200 gf / 25 mm or more, it can be said that the bonding is practically acceptable.

8) Self-adhesiveness 2 Ink-jet recording was performed on the adhesive recording sheets (excluding laminated recording paper and laminated postcards) obtained in Examples and Comparative Examples, and the adhesive surfaces were folded from the center and laminated. Then, they were heated and integrated with a household iron to obtain a laminated double-sided recording sheet. In Comparative Examples 3 and 4, the release paper was peeled off and bonded. After aging for one day, the adhesive strength was measured with a Tensilon universal tensile tester. If the tensile strength (adhesive strength) is 200 gf / 25 mm or more, it can be said that the bonding is practically acceptable. All of the double-sided recording sheets obtained in the self-adhesion test had good ink jet recording properties.

9) Laminating position controllability In a high quality paper adhesiveness test, a recording sheet and a high quality paper are overlapped and edge-aligned, and a material which can be easily position-controlled so that both pieces are in close contact with each other is controlled. The adhesiveness was excellent, and even if the edges were to be aligned, they were adhered to each other once they were overlaid, and the lamination position could not be changed.

[0075]

[Table 1]

[0076]

[Table 2]

10) Suitability for Window Adhesion The heat-adhesive sheets obtained in Examples 1 to 3 were overlaid on the window of the window-opening envelope base paper and heated with an iron to be laminated.
Each of the heat-adhesive recording sheets was sufficiently stuck to the window-opening envelope base paper, did not come off even when a force was applied, and had such transparency that the contents could be sufficiently confirmed. Inkjet printing was performed on the window after forming the window-opening envelope, but required printing was possible without blurring of the printing, and the barcode reader could read it. On the other hand, all of the film portions (often polyester, OPP, and OPS) of a general window-opening envelope were not suitable for printing because ink-jet printing flowed.

11) Adhesion Temperature The heat-adhesive recording sheet or the heat-adhesive recording paper obtained in Examples 1 to 4 and the high-quality paper were heat-bonded at different heating temperatures. Melting point of each synthetic resin, 5 ° C lower than melting point, 10 ° C lower than melting point, 15 ° C lower than melting point
Heat bonding was performed at a temperature lower by ° C. In each case, heat bonding was possible, but heating at the melting point of the synthetic resin did not withstand the heating of the synthetic resin sheet or the synthetic resin laminate, resulting in deformation after bonding. Even in the case of bonding at a temperature lower by 5 ° C. than the melting point, there were problems such as floating or undulation in the ink receiving layer, possibly due to the melting portion of the synthetic resin portion. At a low temperature of 10 ° C. or more from the melting point, heat lamination was possible without any problem. As a matter of course, the heating needs to be performed at a temperature higher than the temperature at which the heat-sensitive adhesive layer is sufficiently activated.

Evaluation: As is clear from the examples, the heat-sensitive adhesive layer (heat seal layer, delayed tack layer,
A heat-adhesive recording sheet having a hot-melt adhesive layer or a pressure-sensitive adhesive layer) and an ink-receiving layer on the opposite side does not exhibit tackiness or adhesiveness in a normal state. It is suitable for paper passing.
The surface is an ink receiving layer, and has good ink jet recording printability. By the action of the heat-sensitive adhesive layer, the recording sheet can be firmly adhered to an adherend or another recording sheet (for example, high-quality paper such as a postcard made by government) by heating or pressing together with the recording sheet. Not only the recorded print is kept clear, but also good printing can be performed by inkjet recording after lamination. Since the heat-sensitive adhesive layer of the present invention does not usually exhibit tackiness or adhesiveness itself, it does not show adhesion or blocking even when the high-quality paper or the recording sheets of the present invention are overlapped with each other. It is possible to perform position control. The recording sheet of the present invention
The two heat-sensitive adhesive layers can be superposed, or one recording sheet can be integrated by folding the heat-sensitive adhesive layer inward and applying heat or pressure to obtain a double-sided recording sheet having ink receiving layers on both sides.

On the other hand, when a recording sheet having an ink-receiving layer having no heat-sensitive adhesive layer as in the comparative example was bonded with a glue or a solvent-type adhesive, the printability was affected by the solvent contained and the solvent. In some cases, or hinder the printing of the ink jet recording already performed. In addition, when the adhesive layer is a mere adhesive layer and is used together with a release paper,
This is probably due to the effect of the adhesive protruding from the edge, but the paper-passing property of the printer is poor, and the printability and print storability in ink-jet recording are not good due to the solvent or the solvent contained in the adhesive layer. Furthermore, if the postcard is about the same size as the postcard and has tackiness on the entire surface, it is very difficult to align the edge with the postcard because the edges cannot be aligned, and it is difficult to attach the postcard without protruding portions.

[0081]

According to the present invention, there is provided a recording sheet having a heat-sensitive adhesive layer and an ink-receiving layer. After inkjet recording, or before recording, it can be bonded to other papers such as government-made postcards, without impairing inkjet recording at the time of lamination, and a recording sheet that does not impair ink jet recording properties by laminating It can be provided, and if it is used for a window opening envelope, ink-jet printing such as a bar code can be performed on the film portion even afterward, and its utility value is great.

Claims (7)

[Claims] 1. A synthetic resin sheet having at least one or more ink-receiving layers on one surface and heat-sealing or hot-sealing that shows tackiness or adhesiveness when heated on the other surface and shows neither tackiness nor adhesion in a normal state. A heat-adhesive recording sheet provided with a heat-sensitive adhesive layer comprising one of a melt and a delayed tack. 2. A recordable window-open envelope, wherein the heat-adhesive recording sheet according to claim 1 is used for a window, and ink-jet recording can be performed on the window after bonding. 3. A synthetic resin laminated paper having at least one or more ink-receiving layers on the synthetic resin surface and a heat or heat-sensitive adhesive which exhibits neither tackiness nor adhesiveness in the normal state but shows adhesiveness or adhesiveness when heated on the other surface. A heat-adhesive recording sheet provided with a heat-sensitive adhesive layer made of any one of a seal, hot melt, and delayed tack. 4. A laminated recording sheet wherein the heat-adhesive recording sheet or the heat-adhesive recording sheet according to claim 1 or 3 and the adherend are heated and adhered. 5. A bonded postcard, wherein the adherend according to claim 4 is an official postcard. 6. The heating of the heat-adhesive recording sheet or the heat-adhesive recording paper according to claim 1 or 2, wherein the heat-sensitive adhesive layers are overlapped with each other, or the heat-sensitive adhesive layers are folded so as to overlap each other. A double-sided recording sheet, wherein the adhesive recording sheet is integrated by heating. 7. The heat-adhesive recording sheet or the heat-adhesive recording paper according to claim 1 is lower than the melting point of the synthetic resin sheet or the synthetic resin laminated paper constituting the heat-adhesive recording sheet by 10 ° C. or more. A method for producing a laminated recording sheet, characterized in that the laminated recording sheet is heated at a temperature and adhered to another support.