JP2001039019A - Recording sheet - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain an ink jet recording sheet having a peculiar appearance for a woven fabric, sufficient ink absorbability and good dryability by sequentially laminating an ink receiving layer, a woven fabric, a discontinuous adhesive resin layer, an ink receiving layer and a support. SOLUTION: An ink jet recording sheet having sufficient ink absorbability while having a peculiar appearance for a woven fabric and good dryability is formed by sequentially laminating an ink receiving layer, a woven fabric, a discontinuous adhesive resin layer, an ink receiving layer and a support. In this case, the woven fabric having a weaving density 20 to 60 pieces/inch or more in lateral and longitudinal directions is used. Thus, cockling when printed is suppressed. As yarns for constituting the fabric, single yarns, two folded yarns, filament yarns or the like can be used. A woven fabric obtained by weaving filament yarns made of fibers having low water absorbability like polyester fibers is preferably used. In the receiving layer, one or more types of white pigments can be used.

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 appearance of a woven fabric, sufficient ink absorbency, and good ink drying property. is there.

[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.

[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.

Conventionally, paper or film has been used as a base material of an ink jet recording sheet. However, due to recent diversification of tastes, ink jet recording sheets based on fabrics represented by woven fabrics have been developed as disclosed in Japanese Patent No. 285859 and Japanese Patent Application Laid-Open No. 62-53493.

However, using a fabric, especially a woven fabric as a support,
In an ink jet recording sheet provided with an ink receiving layer thereon, it is generally difficult to provide the ink receiving layer as a continuous film because pores exist between the weaves of the woven fabric. Therefore, compared to the ink receiving layer that forms a continuous film on paper or a film substrate, the ink absorbing ability is poor, the printing overflows, bleeding occurs, and the drying property after printing is also poor. turn into.

[0007]

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide an ink jet recording sheet which has sufficient ink absorption while having a unique appearance of a woven fabric, and has good drying properties.

[0008]

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

That is, there is provided an ink jet recording sheet in which an ink receiving layer 1, a woven fabric, a discontinuous adhesive resin layer, an ink receiving layer 2, and a support are sequentially laminated.

[0010] Further, the invention is the ink jet recording sheet described above, wherein the weaving density of the woven fabric is not less than 20 yarns / inch and not more than 60 yarns / inch.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION The ink jet recording sheet of the present invention has two ink receiving layers and therefore has a sufficient ink absorbency, and therefore has good ink drying properties after printing. Further, the weaving density of the woven fabric existing between the ink receiving layers is set to 20 / inch or more and 60 / woven fabric in both the vertical and horizontal directions.
It has been found that by setting the size to inches or less, the occurrence of cockling during printing can be suppressed. In general, cockling is considered to be caused by insufficient ink absorbing power. However, in a configuration such as the ink jet recording sheet of the present invention, the balance of the amount of ink absorbed into the two ink receiving layers has an effect. It is presumed that there is.

The fibers constituting the woven fabric used in the present invention include, for example, polyester fibers such as polyethylene terephthalate, polybutylene terephthalate or homopolymers and copolymers of modified polymers of these polymers, polypropylene, polyethylene, polystyrene. Or polyolefin fibers such as homopolymers and copolymers such as modified polymers of these polymers; polyacrylonitrile fibers such as acrylic fibers and modacrylic fibers; nylon fibers such as nylon 6 and nylon 66; and polyvinyl alcohol fibers. , Urethane fiber / organic synthetic fiber; etc .; regenerated cellulose fiber such as rayon; and regenerated fiber such as fiber spun from collagen, alginic acid, chitin or the like; spun fiber such as acetate fiber Fiber; natural fibers such as cellulosic fibers such as hemp, cotton and pulp, and protein fibers such as wool and silk; and various fibers such as inorganic fibers such as metal fibers, glass fibers and carbon fibers. These can be used alone or in combination.

In the present invention, the woven fabric preferably has a weave density of 20 yarns / inch or more and 60 yarns / inch or less for both warp and weft yarns. If the weaving density is less than 20 lines / inch, the opacity of the recording sheet tends to decrease, and the print density tends to slightly decrease. Also,
If the weaving density exceeds 60 yarns / inch, cockling tends to occur after printing. As the woven fabric, woven fabrics of woven fabrics such as plain weave, twill weave, satin weave, etc. can be used. can do. The effects of the present invention are remarkably exhibited when a woven fabric woven of filament yarns made of fibers having low water absorption such as polyester fibers is used.

As the support in the present invention, high quality paper,
General paper such as art paper, coated paper, cast paper, glassine paper can be used, and raw materials usually used in papermaking, such as wood pulp, synthetic pulp, fillers, sizing agents, paper strength agents, dyes, etc. are used as necessary. Can be used. Further, as the support of the present invention, it is also possible to use a synthetic resin sheet, polyethylene as a synthetic resin,
Biaxially stretched sheets of polypropylene, polyethylene terephthalate, polyester, polyamide, polycarbonate, vinylon, polyvinyl alcohol, nylon, polyvinyl chloride, polyvinylidene chloride, polymethylpentene, etc., and synthetic resins containing pigments, foaming agents, etc. A translucent biaxially stretched synthetic resin sheet with reduced transparency, a synthetic paper or nonwoven fabric made of these synthetic resins, or a laminated paper obtained by laminating these synthetic resins on one or both sides of paper. All synthetic resin sheets may be transparent, white, or colored. When the ink receiving layer is provided 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 a corona treatment, a frame treatment, a plasma treatment, a surface treatment such as an ultraviolet irradiation treatment or starch, An ink receiving layer having a multilayer structure in which an anchor coat layer is provided with polyvinyl alcohol or the like and then an ink receiving layer is provided.

The adhesive resin constituting the adhesive resin layer in the present invention is not particularly limited as long as it is an adhesive or a pressure-sensitive adhesive generally used in the field of paper. Examples of the resin used include a rubber-based adhesive resin and a synthetic rubber-based resin. Adhesive resin, modified rubber adhesive resin, polyvinyl acetate resin adhesive resin, polyurethane resin adhesive resin, nitrocellulose adhesive resin, polyester resin adhesive resin, urea resin adhesive resin, phenol resin adhesive resin, melamine resin adhesive Adhesive resin, resorcinol adhesive resin, polyvinyl alcohol adhesive resin, sodium silicate adhesive resin, epoxy resin adhesive resin, cyanoacrylic resin adhesive resin, acrylic resin adhesive resin, silicone resin adhesive resin, unsaturated polyester resin Adhesive resin, ethylene / vinyl acetate adhesive resin,
A polyamide resin-based adhesive resin, an aliphatic or aromatic polyurethane-based adhesive resin, a copolymerized nylon-based adhesive resin, or the like is used, and a polyurethane-based adhesive resin is preferably used from the viewpoint of adhesive strength, heat resistance, and the like. The coating shape of the adhesive resin may be an organic solvent type, an aqueous solution type, an emulsion type, a non-solvent type, a reaction hardening type, or a hot melt type. The method of curing the adhesive resin may be natural drying, oxidative curing, heat curing, addition polymerization, condensation polymerization, heat drying, two-part curing, or radiation curing.

In the ink receiving layer 1 and the ink receiving layer 2 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,
White inorganic pigments such as calcium silicate, magnesium silicate, synthetic amorphous silica, colloidal silica, colloidal alumina, pseudoboehmite, aluminum hydroxide, alumina, lithopone, zeolite, hydrohaloysite, magnesium carbonate, magnesium hydroxide, and styrene-based plastic pigment , Acrylic plastic pigment,
Organic pigments such as polyethylene, microcapsules, urea resins, and melamine resins are exemplified. Among the above,
As the white pigment contained as the main component in the ink receiving layer, a porous inorganic pigment is preferable, and examples thereof include porous synthetic amorphous silica, porous magnesium carbonate, and porous alumina. Synthetic amorphous silica is preferred.

Examples of the adhesive include polyvinyl alcohol, vinyl acetate, oxidized starch, etherified starch, cellulose derivatives such as carboxymethylcellulose and hydroxyethylcellulose, casein, gelatin,
Soy protein, silyl-modified polyvinyl alcohol, etc .; conjugated diene copolymer latex such as styrene-butadiene copolymer, methyl methacrylate-butadiene copolymer;
Acrylic polymer latex such as polymer or copolymer of acrylic acid ester and methacrylic acid ester, polymer or copolymer of acrylic acid and methacrylic acid; vinyl polymer latex such as ethylene vinyl acetate copolymer; or Functional group-modified polymer latex by a monomer containing a functional group such as a carboxyl group of these various polymers; aqueous adhesives such as thermosetting synthetic resin systems such as melamine resin and urea resin;
Synthetic resin-based adhesives such as polymethyl methacrylate, polyurethane resin, unsaturated polyester resin, vinyl chloride-vinyl acetate copolymer, polyvinyl butyral, and alkyd resin are used, and one or more of them are used.

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

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

In order to produce the ink jet recording sheet of the present invention, it is necessary to coat or impregnate an ink-receiving component on a woven fabric or a support. The means include various blade coaters, roll coaters, air knife coaters, bar coaters, rod blade coaters, short dwell coaters, comma coaters, die coaters,
Coating devices such as a reverse roll coater, a kiss coater, a dip coater, a curtain coater, an extrusion coater, a gate roll coater, a gravure coater, a microgravure coater, a size press, and a tab size press can be used. The ink receiving layer 1 may be impregnated in a woven fabric.

In the ink jet recording sheet of the present invention, the coating amount of the ink receiving component is not particularly limited, but is preferably 5 g / m ² or more and 50 g / m ² or less, more preferably 10 g / m ² or more. It is 40 g / m ² or less. In particular, when the coating amount of the ink receiving layer 1 applied to the woven fabric is less than 5 g / m ² , the ink absorbing ability decreases and bleeding occurs. On the other hand, when the coating amount exceeds 50 g / m ² , the ink receiving component is thick and covers the woven fabric surface, so that the powder drop of the ink receiving component becomes conspicuous, which also lowers the print quality.

In order to produce the ink jet recording sheet of the present invention, the ink receiving layer 1 may be applied to a woven fabric and then a support provided with the adhesive resin layer and the ink receiving layer 2 may be laminated. After laminating a support having an adhesive resin layer and an ink receiving layer 2 coated on a cloth, the ink receiving layer 1 may be coated on the surface of the woven fabric. The ink receiving layer 1 and the ink receiving layer 2 may have the same composition or different compositions.

Since the ink jet recording sheet of the present invention has a sufficient ink absorbency, it does not cause printing bleeding or the like and shows good ink drying properties.

[0024]

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

<Preparation of Ink Receiving Component Liquid 1> 100 parts of synthetic amorphous silica (Nipsil RS150: manufactured by Nippon Silica Co., Ltd.), vinyl acetate-ethylene-special ester adhesive (Sumika Flex 951, manufactured by Sumitomo Chemical Co., Ltd.)
30 parts, cationic dye fixing agent (SUMIREZ Resin 10
01: manufactured by Sumitomo Chemical Co., Ltd.), and prepared
Ink receiving component liquid 1 having a solid content of 13% was obtained.

<Preparation of Ink Receiving Component Liquid 2> 10 parts of synthetic amorphous silica (Fanseal X37B, manufactured by Tokuyama Soda)
Polyvinyl alcohol (PVA117, made by Kuraray) 13
0 parts, cationic dye fixing agent (SUMIREZ Resin 100
1, manufactured by Sumitomo Chemical Co., Ltd.), and the resulting mixture was adjusted to a solid content concentration of 15%.

Example 1 A high quality paper having a basis weight of 50 g / m ² was prepared as a support, and an ink receiving component liquid prepared by a preliminary operation so that the coating amount after drying with an air knife coater was 10 g / m ^2. 2 was applied to one side of the woodfree paper and dried to obtain a support on which the ink receiving layer 2 was applied. Next, as a woven cloth, polyester cloth (20th yarn, warp density 66 threads / inch, weft density 70 threads / inch)
Prepared, and the coating amount after drying with a comma coater is 30 g / m ^2.
Was applied to one side of the polyester cloth and dried to obtain a woven cloth on which the ink receiving layer 1 was applied.

Further, an emulsion-type adhesive resin VP-57 (manufactured by Kanebo NS Co.) was used as an adhesive resin on the surface of the woven fabric on which the ink receiving layer 1 was applied, opposite to the ink receiving layer 1. Coating with a direct gravure coater so that the dry weight becomes 6 g / m ² , drying with hot air, and superimposition on the surface of the ink receiving layer 2 of the support on which the ink receiving layer 2 is applied, to obtain the ink jet recording sheet of the present invention. Obtained. When the adhesive resin layer was observed, the adhesive resin layer formed a discontinuous coating.

Example 2 A high-quality paper having a basis weight of 50 g / m ² was prepared as a support, and an ink receiving component liquid prepared by a preliminary operation so that the coating amount after drying with an air knife coater was 10 g / m ^2. 1 was applied to one surface of the woodfree paper and dried to obtain a support on which the ink receiving layer 1 was applied. Next, as a woven cloth, polyester cloth (20th yarn, warp density 66 threads / inch, weft density 70 threads / inch)
Prepared, and the coating amount after drying with a comma coater is 30 g / m ^2.
Was applied to one side of the polyester cloth and dried to obtain a woven cloth on which the ink receiving layer 1 was applied.

Further, an emulsion type adhesive resin VP-57 (manufactured by Kanebo NSC) was used as an adhesive resin on the surface of the woven fabric on which the ink receiving layer 1 was coated, opposite to the ink receiving layer 1. Coating with a direct gravure coater so that the dry weight becomes 6 g / m ² , drying with hot air, and superimposition with the surface of the ink receiving layer 1 of the support on which the ink receiving layer 1 has been applied, to obtain the ink jet recording sheet of the present invention. Obtained. When the adhesive resin layer was observed, the adhesive resin layer formed a discontinuous coating.

Example 3 An ink jet recording sheet of the present invention was obtained in the same manner as in Example 1 except that the woven fabric was changed to a cotton cloth (5th yarn, warp density 18 yarns / inch, weft density 18 yarns / inch). .

Example 4 An ink jet recording sheet of the present invention was obtained in the same manner as in Example 1 except that the woven cloth was changed to a polyester cloth (10-count yarn, warp density 56 yarns / inch, weft density 54 yarns / inch). Was.

Example 5 An ink jet recording sheet of the present invention was obtained in the same manner as in Example 1 except that the woven cloth was changed to a cotton cloth (8th yarn, warp density 24 yarns / inch, weft density 26 yarns / inch). .

COMPARATIVE EXAMPLE 1 Emulsion type adhesive resin VP-57 was applied on the ink receiving layer 2 side of the support on which the ink receiving layer 2 was provided.
After drying, an ink jet recording sheet was obtained in the same manner as in Example 1, except that the woven fabric coated with the ink receiving layer 1 was overlaid. When the adhesive resin layer was observed, a continuous film was formed.

COMPARATIVE EXAMPLE 2 A polyester cloth (20-count yarn, warp density: 66 threads / inch, weft density: 70 threads / inch) was prepared as a woven cloth, and an emulsion resin was used as an adhesive resin on one surface of the woven cloth. Using Resin VP-57 (manufactured by Kanebo NSC),
Coating with a direct gravure coater to a dry weight of 6 g / m ² , drying with hot air, and 50 g / g
providing a high quality paper of m ^2, and superimposed with one surface of the upper quality paper. Next, the ink receiving component liquid 1 was applied to the woven fabric surface of the laminated sheet using a comma coater so that the amount of application after drying was 30 g / m ^2, and dried to obtain an ink jet recording sheet. When the adhesive resin layer was observed, the adhesive resin layer formed a discontinuous coating.

<Test Method> 1) Recording Part Bleeding The ink bleeding was performed using the Epson Super Fine paper as a standard sample, and the dot diameter (Do) of each of the examples and comparative examples and the dot diameter (Dn) of the standard sample. And the ratio (D
o / Dn). This ratio (dot enlargement ratio: Do / Dn
) Exceeds 1.1, indicates that the dots are slightly enlarged to the extent that there is no practical problem due to bleeding, and if it exceeds 1.2, the sharpness and color deterioration are evident due to bleeding and are subjective. The problem is that it affects the image evaluation. The dot diameter was a circle equivalent diameter defined by the following equation (1). The measurement of Do and Dn was performed by leaving each sample in an environment at room temperature of 20 ° C. and a humidity of 65% for 24 hours to adjust the humidity, and then under the same environment, an ink jet printer (MJ-830C manufactured by Epson).
To print dots with black ink, and measure using an image analyzer.

[0037]

Di = {(4 / π) × Ai} ^1/2 where Di is a circle equivalent diameter (dot diameter), Ai is an actually measured area, and i is a variable corresponding to each embodiment and comparative example. (Equivalent to i = 0 or i = n).

2) Ink Drying Properties The recording sheets prepared in Examples and Comparative Examples were cut to A4 size, and thereafter, were composed of 100% each of black, cyan, magenta and yellow by an ink jet printer (JV2-130 manufactured by Mimaki Engineering). Performs heavy-color black printing. Immediately after printing is completed, PPC paper is superimposed on the printing section,
After rubbing from above and transferring the undried ink to PPC paper, the density of the printed portion was measured by Macbeth RD919. A smaller value indicates better ink drying property.

3) Cockling The recording sheets prepared in Examples and Comparative Examples were cut to A4 size, and thereafter, were subjected to an ink jet printer (JV2-130, manufactured by Mimaki Engineering) to obtain a 100% overlap of each color of black, cyan, magenta, and yellow. Print almost the entire surface in black and white. After the printing is completed, the degree of cockling is visually observed. If no cockling has occurred, the cockling is excellent, and if there is slight cockling but not yet rubbed against the head, the cockling is lined up. The cockling was judged to be inferior in those that had been lost.

4) Print Density The recording sheets prepared in Examples and Comparative Examples were cut to A4 size, and 100% solid black printing was performed by an ink jet printer (JV2-130 manufactured by Mimaki Engineering). The density of the printed area was measured by Macbeth RD919. Larger values indicate higher print density and better printability.

[0041]

[Table 1]

Evaluation: As is clear from the table, in Examples 1 to 3 which are the ink jet recording sheets of the present invention, there is no bleeding of the recording portion and the ink drying property is good. When the adhesive resin layer becomes a continuous film as in Comparative Example 1,
It can be seen that the ink absorbency decreases immediately, and the ink bleeding and drying properties deteriorate. Further, even in Comparative Example 2 without the ink receiving layer 2, the same effect as in the present invention cannot be obtained. Further, when Examples 3 and 4 are compared, it is understood that the printing density can be slightly improved by setting the weaving density of the woven fabric to 20 yarns / inch or more. Further, it can be seen that cockling during printing is improved by setting the weaving density of the woven fabric to be not less than 20 yarns / inch and not more than 60 yarns / inch as in Example 5.

[0043]

The ink jet recording sheet of the present invention has good ink absorbability, so that no bleeding occurs during printing and the ink drying property is good. Further, by setting the weaving density of the woven fabric to be not less than 20 yarns / inch and not more than 60 yarns / inch, cockling is improved and effective.

Claims (2)

[Claims] 1. An ink jet recording sheet comprising an ink receiving layer 1, a woven fabric, a discontinuous adhesive resin layer, an ink receiving layer 2, and a support laminated in that order. 2. The ink jet recording sheet according to claim 1, wherein the weaving density of the woven fabric is not less than 20 yarns / inch and not more than 60 yarns / inch in both the vertical and horizontal directions.