JP2000233571A - Ink jet recording sheet - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an ink jet recording sheet having a peculiar appearance like a fabric, good color developing of a recording image, excellent weather resistance in the case of outdoor using, and no cockling. SOLUTION: A primary coating layer containing a thermoplastic resin having a glass transition temperature of -30 to 45 deg.C, and an ink receptive layer are sequentially laminated on one surface of a nonwoven fabric made of polyester fibers having a fiber size of 0.3 to 10 μm. Further, as a support, a nonwoven fabric constituted of polyester fibers having a fiber size of 0.3 to 10 μm and impregnated with a primary coating layer containing a thermoplastic resin having a glass transition temperature of -30 to 45 deg.C is used, and the receptive layer is laminated on at least one side of the support.

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, and more particularly to an ink jet recording sheet having a unique texture and good color development of a recorded image.

[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. Further, it is possible to obtain an image formed by the multi-color ink jet recording method which is comparable to multi-color 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 a recording sheet used in the ink jet recording system, there is a high quality paper or a coated paper used for ordinary printing or writing, or a sheet provided with an ink receiving layer to improve the ink jet recording suitability.
In recent years, as the performance of an ink jet printing apparatus has been improved and the use thereof has been expanded, such as an increase in the speed, definition, and full color of the apparatus, more advanced characteristics have been required for a recording sheet.

[0004] That is, the recording sheet has a high density of print dots, a bright and vivid color tone, quick absorption of ink, no ink bleeding or bleeding even when the print dots overlap, High image reproducibility is required such that the diffusion in the horizontal direction is not unnecessarily large and the periphery is smooth and not blurred.

On the other hand, in the fields of design, events, advertisements, etc., a color image which uses a durable or water-resistant support and is characterized by the texture of the support itself is used for posters and signs. Records are widespread. Under such circumstances, various types of ink jet recording fabrics using a fabric such as a woven fabric, a knitted fabric, or a non-woven fabric as a support have been proposed (JP-A-02-099677, JP-A-02-219679,
JP-A-06-128854). However, since such a fabric is more porous than paper or film, even if an ink receiving layer is provided in order to improve the suitability for ink jet recording, the coating amount of the ink receiving layer is increased, which is not only uneconomical. When the amount of coating is increased, the sheet becomes hard and the texture peculiar to the fabric is lost. Further, a large number of voids are formed on the surface of the coating layer of the ink receiving layer. A method of increasing the viscosity of the coating liquid for the ink receiving layer (JP-A-62-53493) has also been proposed, but the effect is insufficient.

[0006] Further, the use of ink-jet recorded sheets for outdoor posters, signboards, and the like is increasing. In this case, naturally, the ink jet recording sheet is exposed to sunlight, wind and rain. In the case of outdoor use, if the ink-jet recording sheet is repeatedly flooded with rainwater or the like and naturally dried, the recording sheet gradually curls and has a problem that the appearance becomes unsightly.

Further, as a problem of the ink jet recording sheet, there is a phenomenon that the sheet is wavy after ink jet recording, so-called cockling. When cockling occurs, not only a sheet conveyance trouble occurs at the time of printing by the ink jet printer, but also the printed sheet becomes wavy, making the appearance unsightly.

[0008]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a unique cloth-like texture, good ink jet recording suitability, excellent weather resistance when used outdoors, and no cockling. It is intended to provide an ink jet recording sheet.

[0009]

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

That is, in an ink jet recording sheet having an ink receiving layer provided on a support, the support is a non-woven fabric mainly composed of polyester fibers having a fiber diameter of 0.3 μm to 10 μm. An undercoat layer containing a thermoplastic resin having a glass transition temperature of −30 ° C. or more and 45 ° C. or less and an ink receiving layer, which are sequentially laminated on one surface of the ink jet recording sheet.

In an ink jet recording sheet having an ink receiving layer provided on a support, the support is mainly composed of polyester fibers having a fiber diameter of 0.3 μm to 10 μm, and has a glass transition temperature of − 30 ° C
An ink jet recording sheet invention, characterized by being a nonwoven fabric impregnated with an undercoat layer containing a thermoplastic resin having a temperature of at least 45 ° C. or lower, and comprising an ink receiving layer laminated on at least one of the supports. is there.

Polyester Fiber 10 Constituting Support
The invention is directed to an ink jet recording sheet in which the ratio of the thermoplastic resin constituting the undercoat layer is 0.1 part or more and 10 parts or less with respect to 0 parts.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The ink jet recording sheet according to the present invention will be described in detail. The inkjet recording sheet of the first aspect of the present invention is a nonwoven fabric in which the support is made of a polyester fiber having a fiber diameter of 0.3 μm or more and 10 μm or less, and has a glass transition temperature of −30 on one surface of the support.
An undercoat layer containing a thermoplastic resin having a temperature of not lower than 45 ° C. and a temperature of not lower than 45 ° C. is sequentially laminated.

The fibers constituting the nonwoven fabric used in the present invention must be mainly polyester fibers. As used herein, the polyester fiber refers to homopolymers and copolymers of polyethylene terephthalate, polybutylene terephthalate, or modified polymers of these polymers. The nonwoven fabric formed by using the polyester-based fiber has a texture unique to the nonwoven fabric. When the undercoat layer of the present invention and the ink receiving layer of the present invention are sequentially laminated on the thus obtained nonwoven fabric to form an ink jet recording sheet, An ink jet recording sheet that maintains a unique texture and is excellent in color development of an image after ink jet recording can be obtained. If it is simply a nonwoven fabric excellent in texture unique to a nonwoven fabric, it can be found among those using fibers other than polyester. An example of such a nonwoven fabric is a nonwoven fabric using polyacrylonitrile fibers or the like. However, the undercoat layer and the ink receiving layer of the present invention are provided on such a nonwoven fabric to form an ink jet recording sheet, either because the ink receiving layer soaks into the nonwoven fabric in a large amount and the coating amount is increased. Not only the texture is lost, but also the color development of the image after inkjet recording becomes insufficient. The present inventors have found that, among a large number of fibers having a texture unique to a nonwoven fabric when formed into a sheet, a nonwoven fabric using a polyester fiber is provided with an undercoat layer of the present invention and an ink receiving layer to form an ink jet recording sheet. Even in this case, it was found that the texture unique to the nonwoven fabric was maintained, and the color development of the image after ink jet recording was good. Probably, since the polyester fiber has moderate water absorption, when the undercoat layer of the present invention and the ink receiving layer are sequentially laminated on the nonwoven fabric, the penetration of the ink receiving layer into the nonwoven fabric becomes slow and uniform coating is performed. Since the textured layer can be formed, the texture unique to the nonwoven fabric is not lost, and it is considered that when the sheet thus obtained is subjected to ink jet recording, good color development is exhibited.

As the fibers forming the nonwoven fabric of the present invention, besides polyester fibers, polyolefin fibers such as polypropylene, polyethylene, polystyrene or homopolymers and copolymers such as modified polymers of these polymers, acrylic fibers, modacrylic fibers, etc. Polyacrylonitrile fiber such as nylon 6, nylon 66
Organic synthetic fibers such as nylon fiber, polyvinyl alcohol fiber, urethane fiber, etc .; regenerated cellulose fiber such as rayon; and fiber spun from collagen, alginic acid, chitin, etc. as a solution. Regenerated fibers; semi-synthetic fibers such as acetate fibers; cellulosic fibers such as hemp, cotton, pulp and the like; and natural fibers such as protein fibers such as wool and silk; metal fibers, glass fibers;
Various fibers such as inorganic fibers such as carbon fibers may be blended. However, these fibers need to be used within a range that does not impair the characteristics of the polyester-based fiber, and specifically, it is preferably 50 parts or less, more preferably 20 parts, per 100 parts of the polyester-based fiber. It is as follows.

The fiber constituting the nonwoven fabric used in the present invention must have a fiber diameter of 0.3 μm or more and 10 μm or less. The fiber diameter here refers to the diameter of the fiber assuming that the shape of the fiber cross section is a perfect circle. If the cross section of the fiber is not a perfect circle, the sectional area of the fiber is calculated, and the diameter is taken as the diameter of a perfect circle corresponding to the sectional area. As for the fiber diameter of the fibers constituting the support of the present invention, the ratio of the fiber diameters in the above range needs to be 99% or more per number. Fiber diameter 0.3μm
If it is smaller, the sheet becomes denser, and the ink absorbency at the time of ink-jet printing is reduced, and bleeding occurs. Further, the water resistance of the printed portion also decreases. On the other hand, if the fiber diameter exceeds 10 μm, the ink penetrates into the inside of the nonwoven fabric at the time of ink-jet printing, and the print density decreases. Further, when the fiber diameter exceeds 10 μm, the fiber streaks in the printing portion become conspicuous.

The nonwoven fabric used in the support of the present invention is roughly classified into a wet nonwoven fabric, a dry nonwoven fabric by a stitch bond method, a spun bond method, a melt blow method, a thermal bond method, etc. There is lace nonwoven fabric. From the viewpoint of sheet strength and texture, a spunlaced nonwoven fabric using a wet nonwoven fabric or a dry nonwoven fabric is preferably used.

In order to produce the ink jet recording sheet of the present invention, it is necessary to provide an undercoat layer containing a thermoplastic resin having a glass transition temperature of −30 ° C. or more and 45 ° C. or less on the nonwoven fabric having the above characteristics. The undercoat layer is provided on one surface of the nonwoven fabric as a support, and is immersed only in the surface layer of the nonwoven fabric, and serves as a seal when the ink receiving layer is provided on the nonwoven fabric. When an ink receiving layer is provided on a porous support such as a nonwoven fabric, an undercoat layer is essential. The support is a non-woven fabric made of polyester fibers having a fiber diameter of 0.3 μm or more and 10 μm or less, and the glass transition temperature of the thermoplastic resin constituting the undercoat layer is set to −30 ° C. or more and 45 ° C. or less, thereby giving a unique texture to the non-woven fabric. Have
This makes it possible to obtain an ink jet recording sheet which is excellent in color development at the time of ink jet recording, has no curl even after being immersed in water and naturally dried, and has excellent water resistance of an image.

When the glass transition temperature of the thermoplastic resin constituting the undercoat layer of the present invention is lower than -30.degree. C., when the undercoat layer is applied to the nonwoven fabric and dried, the thermoplastic resin becomes tacky in the drying zone, and Problems such as sticking of the sheet in the zone and soiling of the drying zone occur. Although it is possible to produce a sheet by lowering the drying temperature, it takes a long time in the drying step, which is not preferable because of poor operability. On the other hand, when the temperature is higher than 45 ° C., when the ink receiving layer is provided on the undercoat layer to produce an ink jet recording sheet, the supple hand peculiar to the nonwoven fabric is lost. Further, when the glass transition temperature exceeds 45 ° C., it has been found that the curl of the sheet when immersed in water and air-dried is severe, and it is difficult to use the sheet in applications such as outdoors exposed to wind and rain.

The types of thermoplastic resins constituting the undercoat layer include (meth) acrylate copolymers, styrene-isoprene copolymers, styrene-acrylate copolymers, styrene-butadiene copolymers, and acrylonitrile. -Butadiene copolymer, ethylene-vinyl acetate copolymer, vinyl acetate-acrylate copolymer,
Ethylene-vinyl chloride copolymer, ethylene-acrylate copolymer, vinyl acetate-ethylene-vinyl chloride copolymer, vinyl acetate-ethylene-acrylate copolymer, vinyl acetate-ethylene-styrene copolymer,
Resins such as polybutadiene and polyurethane are exemplified.
Among them, resins satisfying the above glass transition temperature are used alone or in combination of two or more.

As a method of providing an undercoat layer on a nonwoven fabric,
Various blade coater, roll coater, air knife coater, bar coater, rod blade coater, short dwell coater, comma coater, die coater, reverse roll coater, kiss coater, curtain coater, extrusion coater, gate roll coater, gravure coater, microgravure A coating device such as a coater can be used.

In the ink jet recording sheet of the present invention, the ratio of the thermoplastic resin constituting the undercoat layer to the polyester fiber constituting the support is preferably 0.1 part to 10 parts. More preferably, it is 0.5 part or more and 5 parts or less. If the proportion of the thermoplastic resin is less than 0.1 part, the effect of the addition is small, and the effect of filling is difficult to obtain. On the other hand, if it exceeds 10 parts, the undercoat layer becomes a continuous film on the nonwoven fabric, the ink absorbency during ink jet recording is reduced, and bleeding is likely to occur.

In the undercoat layer used in the present invention, as additives other than the above-mentioned thermoplastic resin, various pigments such as inorganic and organic, pigment dispersants, thickeners, flow improvers, pH adjusters, Inks with foaming agents, foam inhibitors, release agents, foaming agents, penetrants, 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.

In order to produce the ink jet recording sheet of the present invention, it is necessary to provide an ink receiving layer on the undercoat layer of the present invention. As the means, the same method as the means for providing the undercoat layer can be used.

In the ink receiving layer used in the present invention,
One or more known white 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,
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 layer 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 in the ink receiving layer, and water is dropped or 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 layer of the present invention includes, for example, polyvinyl alcohol, vinyl acetate, oxidized starch, etherified starch, cellulose derivatives such as carboxymethylcellulose, hydroxyethylcellulose, casein, gelatin, soy 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 latex Aqueous adhesives such as thermosetting synthetic resins such as melamine resin and urea resin; Synthetic resin adhesives such as polymethyl methacrylate, polyurethane resin, unsaturated polyester resin, vinyl chloride-vinyl acetate copolymer, polyvinyl butyral, and alkyd resin Agents,
Used in one or more types.

Further, other additives include a pigment dispersant, a thickener, a flow improver, a pH adjuster, an antifoaming agent, a foam inhibitor, a release agent, a foaming agent, a penetrant, a coloring dye, and a coloring agent. Pigments, fluorescent brighteners, ultraviolet absorbers, antioxidants, antiseptics, anti-binders, water-proofing agents, wet-strength agents, dry-strength agents, and the like can be appropriately compounded in the ink-receiving layer. .

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 3 g / m ² or more and 40 g / m ² or less, more preferably 5 g / m ² or more. It is 20 g / m ² or less. If the coating amount is less than 3 g / m ² , the ink absorbing ability is reduced and bleeding is liable to occur, and the fiber streaks in the printing portion become conspicuous. On the other hand, when the coating amount exceeds 40 g / m ² , the printing quality reaches saturation and is uneconomical, and powder dropping of the ink receiving component becomes conspicuous. In addition, when one-side coating is performed, curling of the product is likely to be severe.

After the ink receiving layer is provided on the nonwoven fabric, flattening may be performed using a calender such as a machine calender, a TG calender, a super calender, and a soft calender. In addition, on the opposite side of the support from the ink receiving layer, it is possible to perform a conductive treatment or to use a known technique such as providing a back coat layer in order to improve printer paper passing property without any problem. it can. Furthermore, it is also possible to provide an ink receiving layer on the surface of the support opposite to the ink receiving layer to obtain an ink jet recording sheet capable of printing on both sides.

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 colorings, and various organic and inorganic pigments such as natural products and synthetic products.

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. As other additives, for example, binder resin, dispersant, pH
Examples include a regulator, a sequestering agent, a fungicide, a viscosity modifier, a surface tension regulator, a wetting agent, a surfactant, and a rust inhibitor.

In the ink jet recording sheet according to the second aspect of the present invention, the support is made of a polyester fiber having a fiber diameter of 0.3 μm to 10 μm and a glass transition temperature of -30 ° C. to 45 ° C. A nonwoven fabric impregnated with a resin-containing undercoat layer, characterized in that an ink receiving layer is laminated on at least one of the supports.

After the support is impregnated with the undercoat layer, an ink receiving layer is provided on one surface of the support to form an ink jet recording sheet, whereby the non-woven fabric obtained in the ink jet recording sheet of the first invention is obtained. It has been found that, in addition to excellent characteristics such as a unique texture, excellent coloring properties of a recorded image, curling resistance, and high image water resistance, excellent characteristics such as no cockling during ink jet recording are exhibited. Probably, impregnation of the support with the undercoat layer improved the dimensional stability of the support when it was brought into contact with water or a solvent, so that cockling did not occur.

The method of impregnating the support with the undercoat layer includes size press coating, tab size press coating, and dip coating. The impregnation of the undercoat layer may be performed from one side or both sides of the support, but is preferably performed from both sides of the support. When such an impregnation means is used, the undercoat layer is in a state of soaking into the entire support. As described above, the undercoat layer is infiltrated into the entire support, whereby the dimensional stability of the support when it comes into contact with water or a solvent is improved, and the effect that cockling does not occur can be obtained. is there.

In order to produce the ink jet recording sheet of the present invention, a thermoplastic resin having a glass transition temperature of -30 ° C. to 45 ° C. is added to a non-woven fabric made of polyester fiber having a fiber diameter of 0.3 μm to 10 μm. It is necessary to impregnate the contained undercoat layer. If the glass transition temperature of the thermoplastic resin constituting the undercoat layer is lower than −30 ° C., when the nonwoven fabric is impregnated with the undercoat layer and dried, the sheet sticks in the drying zone, which causes a problem in operability. When the support is impregnated with an undercoat layer, and the ink receiving layer is provided on one surface of the support to form an ink jet recording sheet, the undercoat layer is exposed on the surface of the sheet opposite to the ink receiving layer. As a result, the touch becomes sticky and the transportability of the ink jet printer deteriorates. On the other hand, when the temperature exceeds 45 ° C., the ink jet recording sheet is inferior in the supple texture peculiar to the nonwoven fabric, and the curling of the sheet when immersed in water and dried naturally becomes severe.

The ink jet recording sheet according to the first aspect of the present invention has a thermoplastic resin having a glass transition temperature of −30 ° C. to 45 ° C. on one surface of a nonwoven fabric made of a polyester fiber having a fiber diameter of 0.3 μm to 10 μm. By sequentially laminating an undercoat layer containing a resin and an ink receiving layer, a sheet having a unique cloth-like texture, good color development of recorded images, and excellent weather resistance when used outdoors. Becomes possible. The ink jet recording sheet according to the second aspect of the present invention, wherein the support comprises a polyester fiber having a fiber diameter of 0.3 μm or more and 10 μm or less, and contains a thermoplastic resin having a glass transition temperature of −30 ° C. or more and 45 ° C. or less. Non-woven fabric impregnated with an undercoat layer to be formed, and by laminating an ink receiving layer on at least one of the supports, it is possible to obtain a sheet without cockling after inkjet recording in addition to the above excellent characteristics. Becomes The proportion of the thermoplastic resin constituting the undercoat layer is 0.1 part or more to 100 parts of the polyester-based fiber constituting the support.
By setting the content to 0 part or less, the texture unique to the nonwoven fabric and the color developability of the recorded image are further improved.

[0039]

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 “%”
Unless indicated otherwise, parts by weight and% by weight are indicated.

Preparation of Coating Solution for Ink Receiving Layer 100 parts of synthetic amorphous silica (Nipsil RS150: manufactured by Nippon Silica Industry), polyvinyl alcohol (PVA)
117: Kuraray Co., Ltd.) and cationic dye fixing agent (Sumireze Resin 1001: Sumitomo Chemical Co., Ltd.) 20 parts were used, and the mixture was adjusted to a solid content of 13%.

Example 1 An aqueous slurry composed of 95 parts of polyethylene terephthalate fiber having a fiber diameter of 0.3 to 0.6 μm and 5 parts of hot water-soluble polyvinyl alcohol fiber was prepared, and the basis weight was 50 g / m by a wet papermaking method. No. ² nonwoven fabrics were produced. The hot water-soluble polyvinyl alcohol fiber does not maintain its form as a fiber due to heat during drying, and is present between polyethylene terephthalate fibers as a binder, and the nonwoven fabric has a fiber diameter of 0.3 to 0.6 μm. It will be composed of A columnar flow of high-speed water spouted from a number of orifices having a diameter of 100 μmφ was made to collide with the nonwoven fabric once at each of the front and back sides to perform spunlace processing. The thus-obtained nonwoven fabric is coated with a vinyl acetate-ethylene-based thermoplastic resin having a glass transition temperature of −25 ° C. (Sumika Flex 951: manufactured by Sumitomo Chemical Co., Ltd.) using an air knife coater after drying to have a coating amount of 0.05 g / m ^2. And drying as described above. At this time, the ratio of the thermoplastic resin to 100 parts of the polyester fiber is 0.1 part. On the undercoat layer thus obtained, the coating liquid obtained in the preparation of the coating liquid for the ink receiving layer was applied using a comma coater so that the coating amount after drying was 15 g / m ^2, and dried to obtain the ink jet ink of the present invention. A recording sheet was obtained.

Example 2 An ink jet recording sheet of the present invention was prepared in the same manner as in Example 1 except that the polyethylene terephthalate fiber having a fiber diameter of 0.3 to 0.6 μm was changed to a polybutylene terephthalate fiber having an average fiber diameter of 8 to 10 μm. Produced.

Example 3 An ink jet recording sheet of the present invention was prepared in the same manner as in Example 1 except that the polyethylene terephthalate fiber having a fiber diameter of 0.3 to 0.6 μm was changed to a polybutylene terephthalate fiber having an average fiber diameter of 2 to 5 μm. Produced.

Example 4 Example 4 was repeated except that the vinyl acetate-ethylene thermoplastic resin having a glass transition temperature of -25 ° C. was changed to an acrylic thermoplastic resin having a glass transition temperature of 43 ° C. (MD-61: manufactured by Nippon NSC). In the same manner as in Example 1, an ink jet recording sheet of the present invention was produced.

Example 5 A vinyl acetate-ethylene thermoplastic resin having a glass transition temperature of -25 ° C. was replaced with an acrylic thermoplastic resin having a glass transition temperature of 43 ° C. (MD-61, manufactured by NSC). In the same manner as in Example 2, an ink jet recording sheet of the present invention was produced.

Example 6 Ink jet recording of the present invention was carried out in the same manner as in Example 1 except that the coating amount after drying of a vinyl acetate-ethylene thermoplastic resin having a glass transition temperature of -25 ° C. was changed to 5 g / m ^2. A sheet was prepared. At this time, the ratio of the thermoplastic resin to 100 parts of the polyester fiber is 10 parts.

Example 7 Ink jet recording of the present invention was conducted in the same manner as in Example 2 except that the coating amount after drying of a vinyl acetate-ethylene thermoplastic resin having a glass transition temperature of -25 ° C. was changed to 5 g / m ^2. A sheet was prepared. At this time, the ratio of the thermoplastic resin to 100 parts of the polyester fiber is 10 parts.

Example 8 An ink jet recording sheet of the present invention was produced in the same manner as in Example 4 except that the coating amount after drying of an acrylic thermoplastic resin having a glass transition temperature of 43 ° C. was changed to 5 g / m ² . .
At this time, the ratio of the thermoplastic resin to 100 parts of the polyester fiber is 10 parts.

Example 9 An ink jet recording sheet of the present invention was produced in the same manner as in Example 5 except that the coating amount after drying of an acrylic thermoplastic resin having a glass transition temperature of 43 ° C. was changed to 5 g / m ² . .
At this time, the ratio of the thermoplastic resin to 100 parts of the polyester fiber is 10 parts.

Example 10 In Example 1, the coating amount of the undercoat layer made of a vinyl acetate-ethylene-based thermoplastic resin having a glass transition temperature of -25 ° C. after drying was changed to 0.03 / m ² . On the undercoat layer thus obtained, the coating liquid obtained in the preparation of the coating liquid for the ink-receiving layer was applied using a comma coater so that the coating amount after drying was 22 g / m ^2, and dried to form the ink-jet ink of the present invention. A recording sheet was obtained. At this time, the ratio of the thermoplastic resin to 100 parts of the polyester fiber is 0.06 parts.

Example 11 Ink jet recording of the present invention was carried out in the same manner as in Example 1 except that the coating amount after drying of a vinyl acetate-ethylene thermoplastic resin having a glass transition temperature of -25 ° C. was changed to 7 g / m ^2. A sheet was prepared. At this time, the ratio of the thermoplastic resin to 100 parts of the polyester fiber is 14 parts.

Example 12 In the same manner as in Example 1, a polyethylene terephthalate fiber having a fiber diameter of 0.3 to 0.6 μm was used and the basis weight was 100 g.
/ m ² of spunlaced nonwoven fabric. In this nonwoven fabric,
Vinyl acetate-ethylene thermoplastic resin having a glass transition temperature of -25 ° C (Sumika Flex 951: manufactured by Sumitomo Chemical Co., Ltd.)
The coating amount after drying with an air knife coater is 0.1 g
/ m ² and coating and drying. At this time, the ratio of the thermoplastic resin to 100 parts of the polyester fiber is 0.1 part. On the undercoat layer thus obtained, the coating liquid obtained in the preparation of the coating liquid for the ink receiving layer was applied using a comma coater so that the coating amount after drying was 15 g / m ^2, and dried to obtain the ink jet ink of the present invention. A recording sheet was obtained.

Example 13 In Example 12, the coating amount after drying of the undercoat layer composed of a vinyl acetate-ethylene-based thermoplastic resin having a glass transition temperature of −25 ° C. was changed to 0.05 / m ² , and ink was received. Example 1 except that the coating amount after drying of the layer was changed to 25 g / m ²
In the same manner as in Example 2, an ink jet recording sheet of the present invention was produced. At this time, the ratio of the thermoplastic resin to 100 parts of the polyester fiber is 0.05 part.

Example 14 Ink jet recording of the present invention was conducted in the same manner as in Example 12 except that the coating amount after drying of a vinyl acetate-ethylene thermoplastic resin having a glass transition temperature of -25 ° C. was changed to 10 g / m ^2. A sheet was prepared. At this time, the polyester fiber 10
The ratio of the thermoplastic resin to 0 parts is 10 parts.

Example 15 Ink jet recording of the present invention was carried out in the same manner as in Example 12 except that the coating amount after drying of a vinyl acetate-ethylene thermoplastic resin having a glass transition temperature of -25 ° C. was changed to 15 g / m ^2. A sheet was prepared. At this time, the polyester fiber 10
The ratio of the thermoplastic resin to 0 parts is 15 parts.

Example 16 In Example 1, instead of providing an undercoat layer with an air knife coater on a nonwoven fabric as a support, the nonwoven fabric was impregnated with a size press coater so that the coating amount after drying was 0.05 g / m ^2. Then, an ink receiving layer was provided on one surface of the nonwoven fabric using a comma coater so that the coating amount after drying was 15 g / m ² , to obtain an ink jet recording sheet of the present invention.

Example 17 An ink jet recording sheet of the present invention was prepared in the same manner as in Example 16 except that the polyethylene terephthalate fiber having a fiber diameter of 0.3 to 0.6 μm was changed to a polybutylene terephthalate fiber having an average fiber diameter of 8 to 10 μm. Produced.

Example 18 The procedure of Example 18 was repeated except that the vinyl acetate-ethylene thermoplastic resin having a glass transition temperature of -25 ° C. was changed to an acrylic thermoplastic resin having a glass transition temperature of 43 ° C. (MD-61: manufactured by NSC). In the same manner as in No. 16, an ink jet recording sheet of the present invention was produced.

Example 19 The procedure of Example 19 was repeated except that the vinyl acetate-ethylene thermoplastic resin having a glass transition temperature of -25 ° C. was changed to an acrylic thermoplastic resin having a glass transition temperature of 43 ° C. (MD-61, manufactured by NSC). In the same manner as in No. 17, an ink jet recording sheet of the present invention was produced.

Example 20 Ink jet recording of the present invention was performed in the same manner as in Example 16 except that the coating amount after drying of a vinyl acetate-ethylene thermoplastic resin having a glass transition temperature of -25 ° C. was changed to 5 g / m ^2. A sheet was prepared. At this time, the polyester fiber 100
The ratio of the thermoplastic resin to parts is 10 parts.

Example 21 In Example 16, the coating amount of the vinyl acetate-ethylene-based thermoplastic resin having a glass transition temperature of −25 ° C. after drying was set at 0.1.
It was changed to 03 g / m ² . On one surface of the nonwoven fabric thus obtained, the coating liquid obtained in the preparation of the coating liquid for the ink receiving layer was applied using a comma coater so that the coating amount after drying was 23 g / m ² , followed by drying. Was obtained. At this time, the ratio of the thermoplastic resin to 100 parts of the polyester fiber is 0.06 parts.

Example 22 Ink jet recording of the present invention was carried out in the same manner as in Example 16 except that the coating amount after drying of a vinyl acetate-ethylene thermoplastic resin having a glass transition temperature of -25 ° C. was changed to 7 g / m ^2. A sheet was prepared. At this time, the polyester fiber 100
The ratio of the thermoplastic resin to parts is 14 parts.

Comparative Example 1 In Example 1, the coating amount after drying the coating liquid obtained by directly preparing the coating liquid for the ink receiving layer without providing an undercoat layer using a comma coater was 40 g / m ² or less. The coating was attempted as described above, but the coating amount could not be achieved probably because the coating liquid easily permeated the nonwoven fabric. Thus, an ink jet recording sheet was prepared by changing the coating amount after drying to 45 g / m ² .

Comparative Example 2 An ink jet recording sheet was prepared in the same manner as in Example 1 except that the polyethylene terephthalate fiber having a fiber diameter of 0.3 to 0.6 μm was changed to a polyethylene terephthalate fiber having an average fiber diameter of 0.1 to 0.3 μm. Obtained.

Comparative Example 3 An ink jet recording sheet was obtained in the same manner as in Example 1 except that the polyethylene terephthalate fiber having a fiber diameter of 0.3 to 0.6 μm was changed to a polyethylene terephthalate fiber having an average fiber diameter of 10 to 13 μm.

Comparative Example 4 In Example 1, the undercoat layer was changed to a glass transition temperature of -25 ° C.
When the vinyl acetate-ethylene thermoplastic resin was changed to an acrylic thermoplastic resin having a glass transition temperature of −35 ° C., a trouble occurred in which a sheet was stuck to a cylinder dryer in a drying process, and the production was abandoned.

Comparative Example 5 An ink jet recording sheet was obtained in the same manner as in Example 1 except that the thermoplastic resin having a glass transition temperature of -25 ° C. was changed to a styrene-acrylic thermoplastic resin having a glass transition temperature of 50 ° C.

Comparative Example 6 An ink jet recording sheet was obtained in the same manner as in Example 1, except that the polyethylene terephthalate fiber having a fiber diameter of 0.3 to 0.6 μm was changed to a polyacrylonitrile fiber having a fiber diameter of 2 to 5 μm.

Comparative Example 7 An ink jet recording sheet was obtained in the same manner as in Example 1 except that the polyethylene terephthalate fiber having a fiber diameter of 0.3 to 0.6 μm was changed to a polypropylene fiber having a fiber diameter of 2 to 5 μm.

Comparative Example 8 An ink jet recording sheet was obtained in the same manner as in Example 16 except that the thermoplastic resin having a glass transition temperature of -25 ° C. was changed to a styrene-acrylic thermoplastic resin having a glass transition temperature of 50 ° C.

<Test Method> 1) Sheet Flexibility The flexibility of the ink jet recording sheet was determined according to the following criteria. A: Tactile sensation and flexibility peculiar to the nonwoven fabric before the undercoat layer and the ink receiving layer were provided were hardly lost. ：: The sheet is slightly harder than before the provision of the undercoat layer and the ink receiving layer, but still has a touch unique to the nonwoven fabric. X: The sheet is hard, and the touch feeling unique to the nonwoven fabric is completely lost.

2) Print Density The recording sheets prepared in Examples and Comparative Examples were cut to A4 size, and then printed on an ink jet printer (MJ-Made by Epson).
830C), 100% solid printing of each color of black, cyan, magenta, and yellow was performed. Macbeth RD919
Was used to measure the density of the printed portion. Larger values indicate higher print density and better printability.

3) Cockling after printing The recording sheets prepared in Examples and Comparative Examples were cut to A4 size, and then cut by an ink jet printer (MJ-Made by Epson).
830C), color printing was performed on the entire surface of the landscape image. The state of the sheet after printing was determined based on the following criteria. ：: No waving occurred on the sheet. ：: The sheet is slightly wavy, but at a level that is not problematic in practical use. X: The sheet is greatly wavy and unsightly in appearance.

4) Curling properties The recording sheets prepared in Examples and Comparative Examples were cut to A4 size, and immersed in water in a bat for 1 hour. The sheet taken out of the water was allowed to stand on a horizontal table with the surface provided with the ink receiving layer facing up and allowed to dry naturally, and the state of curling of the sheet was observed. The average value of the height of the sheet floating from the four horizontal planes was defined as the curl value. If this value was 10 mm or less, it was determined that it was at a practical level.

5) Water resistance The recording sheets prepared in Examples and Comparative Examples were cut to A4 size, and then cut by an ink jet printer (MJ-Made by Epson).
830C), solid printing of 100% for each color of black, cyan, magenta, and yellow was performed, and the density of the printed portion was measured by Macbeth RD919. This sheet was immersed in the water in the vat for one day. The sheet taken out of the water was allowed to stand on a horizontal table with its surface provided with the ink receiving layer facing up, and air-dried. The density of the printed portion after air drying was measured in the same manner using Macbeth RD919. Residual rate of print density (%)
= Print density after water resistance test / Print density before water resistance test x 10
0 was calculated and used as an index of water resistance. The larger the value, the better the water resistance, and if it is 97% or more, it was judged to be a practicable level.

[0076]

[Table 1]

As is clear from the table, the fiber diameter is 0.3 μm.
Using a non-woven fabric made of polyester fibers of 10 μm or less as a support, an undercoat layer containing a thermoplastic resin having a glass transition temperature of −30 ° C. or more and 45 ° C. or less, and an ink-receiving layer on one surface of the support. The ink jet recording sheet of the present invention, which is sequentially laminated, has a texture unique to a nonwoven fabric, and has good color development of an ink jet recorded image. Further, even when wet and dried, the print density is not reduced or curl is not generated, and the present invention can be used in applications such as outdoors where the device is exposed to wind and rain. These characteristics are even more pronounced in Examples 1 to 9, 12, and 14 in which the proportion of the thermoplastic resin constituting the undercoat layer is 0.1 part or more and 10 parts or less based on 100 parts of the polyester fiber constituting the support. It will be good.

Further, as shown in Examples 16 to 22,
The support is made of a polyester fiber having a fiber diameter of 0.3 μm or more and 10 μm or less, and has a glass transition temperature of −3.
An ink jet recording sheet of the present invention, which is a nonwoven fabric impregnated with an undercoat layer containing a thermoplastic resin having a temperature of 0 ° C. or more and 45 ° C. or less, and having an ink receiving layer laminated on one surface of the support, a nonwoven fabric specific Excellent properties such as good texture, good color developability of ink jet recorded images, resistance to curl when wet with water, good water resistance of images, and no cockling of sheets after ink jet recording. Is shown. These characteristics become even better in Examples 16 to 20 in which the ratio of the thermoplastic resin constituting the undercoat layer is 0.1 part or more and 10 parts or less with respect to 100 parts of the polyester fiber constituting the support. INDUSTRIAL APPLICABILITY The ink jet recording sheet of the present invention is excellent in aesthetics, has good coloration of an image, and has good water resistance of an image, and thus can be used in applications such as outdoor posters which are exposed to wind and rain.

On the other hand, when the undercoat layer is not provided as in Comparative Example 1, the ink receiving layer has a large penetration into the nonwoven fabric, and the coating amount is too large. Therefore, the produced sheet is inferior in flexibility, and if it is naturally dried after being wetted with water, the curl becomes large and the practicality is inferior. Comparative Example 2 using a nonwoven fabric made of a polyester fiber having a fiber diameter smaller than 0.3 μm is inferior in water resistance. In Comparative Example 3 using a polyester fiber having a fiber size larger than 10 μm, the ink penetrates into the inside of the nonwoven fabric, and the print density is reduced. In Comparative Example 4 in which the glass transition temperature of the undercoat layer is lower than −30 ° C., the sheet sticks to the cylinder dryer in the drying step of the undercoat layer, and a sample cannot be produced. In Comparative Examples 5 and 8 in which the glass transition temperature of the undercoat layer is higher than 45 ° C., the curl when wet with water and air-dried is large, and is not suitable for outdoor use. In Comparative Examples 6 and 7 using fibers other than the polyester-based fibers, the print density was low and the coloring was poor.

[0080]

The ink jet recording sheet according to the first aspect of the present invention has a glass transition temperature of -30.degree. C. to 45.degree. C. on one surface of a nonwoven fabric made of a polyester fiber having a fiber diameter of 0.3 to 10 .mu.m. By sequentially laminating an undercoat layer containing a thermoplastic resin and an ink receiving layer,
It is possible to obtain a sheet having a unique cloth-like texture, good color development of a recorded image, and excellent weather resistance when used outdoors. The ink jet recording sheet according to the second aspect of the present invention, wherein the support comprises a polyester fiber having a fiber diameter of 0.3 μm or more and 10 μm or less, and contains a thermoplastic resin having a glass transition temperature of −30 ° C. or more and 45 ° C. or less. Non-woven fabric impregnated with an undercoat layer to be formed, and by laminating an ink receiving layer on at least one of the supports, it is possible to obtain a sheet without cockling after inkjet recording in addition to the above excellent characteristics. Becomes The proportion of the thermoplastic resin constituting the undercoat layer is 0.1 part or more to 100 parts of the polyester-based fiber constituting the support.
By setting the content to 0 part or less, the texture unique to the nonwoven fabric and the color developability of the recorded image are further improved.

Claims (3)

[Claims] 1. An ink jet recording sheet comprising an ink receiving layer provided on a support, wherein the support is a non-woven fabric mainly composed of polyester fibers having a fiber diameter of 0.3 μm or more and 10 μm or less. An ink jet recording sheet comprising: a primer layer containing a thermoplastic resin having a glass transition temperature of −30 ° C. or more and 45 ° C. or less and an ink receiving layer sequentially laminated on one surface of the ink jet recording sheet. 2. An ink jet recording sheet comprising an ink receiving layer provided on a support, wherein the support is mainly composed of polyester fibers having a fiber diameter of 0.3 μm or more and 10 μm or less, and has a glass transition temperature. Is -30
An ink jet recording sheet, which is a nonwoven fabric impregnated with an undercoat layer containing a thermoplastic resin having a temperature of not lower than 45 ° C. and not higher than 45 ° C., wherein an ink receiving layer is laminated on at least one of the supports. 3. A polyester fiber 1 constituting a support.
3. The ink jet recording sheet according to claim 1, wherein the proportion of the thermoplastic resin constituting the undercoat layer is 0.1 part or more and 10 parts or less with respect to 00 parts.