JP2001105716A - Mat ink jet recording sheet - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a mat ink jet recording sheet capable of clearly forming a print image without stain or beading even by using a large quantity of an ink. SOLUTION: The mat ink jet recording sheet comprises an ink image receiving layer containing at least a cellulose fine powder and a binder and formed on a base material sheet.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a matte ink jet recording sheet capable of forming a clear printed image without bleeding or beading even when a large amount of ink is used.

[0002]

2. Description of the Related Art Ink jet printers are widely used not only as output devices such as personal computers but also as means for printing on media of various materials. The recording medium for an ink jet printer has an ink image receiving layer formed by mixing inorganic binder particles such as silica, alumina, titania, and zirconia with a binder resin such as polyvinyl alcohol on the surface to give a matte texture. Thereby, the surface is made mat-like.

[0003] By adding inorganic fine particles such as silica to the ink image receiving layer, it is possible to enhance the ink absorbing ability and adsorbing ability. However, when a large amount of ink is used to give a thick feeling to printing, bleeding or beading (color unevenness caused by non-uniform ink absorbency) also occurs, and a printed image is clearly formed. There is a problem that it cannot be formed.

[0004] In order to solve the bleeding caused by the ink, there is a method of adding a dye fixing agent or the like to the ink image receiving layer. However, there is a problem in compatibility between the dye fixing agent and the binder resin.
It is not preferable from the viewpoint of manufacturing suitability.

Accordingly, an object of the present invention is to provide a matte ink jet recording sheet capable of forming a clear printed image without bleeding or beading even when a large amount of ink is used.

[0006]

Means for Solving the Problems As a result of intensive studies in view of the above object, the present inventor has found that by adding cellulose fine powder instead of inorganic fine particles such as silica conventionally added to an ink image receiving layer. The present inventors have found that a matte inkjet recording sheet which does not cause bleeding or beading even when a large amount of ink is used without using a dye fixing agent can be obtained, and arrived at the present invention.

That is, the matte ink jet recording sheet of the present invention is characterized in that an ink image receiving layer containing at least cellulose fine powder and a binder is formed on a base sheet.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS [1] Matte inkjet recording sheet The matte inkjet recording sheet of the present invention is obtained by forming an ink image receiving layer containing cellulose fine powder on a base sheet. Hereinafter, (A) a base sheet and (B) an ink image receiving layer will be separately described in detail.

(A) Base sheet The base sheet used in the present invention is not particularly limited as long as the ink image-receiving layer can be applied, and is not particularly limited. Or, a cloth can be used.

The thickness of the base sheet is not particularly limited as long as it has sufficient durability, and may be appropriately selected according to the purpose of use of the sheet.

(B) Ink image receiving layer The ink image receiving layer is formed by laminating an ink image receiving layer containing at least a binder resin and cellulose fine powder on a base sheet.

The ink image receiving layer is applied so as to have a thickness of 5 to 50 μm. When the thickness of the ink image receiving layer is 5 μm or less, a clear image is not formed, which is not preferable. Also,
When the thickness is 50 μm or more, it is not preferable because when printed by an inkjet printer, the base sheet curls and cannot be used.

(1) Binder The binder is used to improve the fixability to the surface of the substrate sheet because cellulose fine powder alone does not form a film on the substrate sheet. One or two selected from the group consisting of alcohol, polyethylene oxide, polypropylene oxide, polyvinyl pyrrolidone, polyacrylamide, water-soluble polyester resin, polyvinyl acetate, water-soluble polyamide resin, polyethylene imine, polyethylene polyamine, and polyallylamine The above binders can be used. Among them, it is particularly preferable to use polyvinyl alcohol or the like.

(2) Cellulose Fine Powder Cellulose fine powder is used for matting the surface of a matte ink jet recording sheet and for adsorbing dye ink. The shape of the cellulose fine powder is not particularly limited, but spherical fine particles are particularly preferred. The average particle size of the cellulose fine particles is 50 μm or less, preferably 5 to 30 μm. Further, inorganic fine particles such as silica, alumina, titania, and zirconia may be used together with the cellulose fine powder. The cellulose fine powder is 30 to 95 wt% when the solid content of the ink image receiving layer is 100 wt%.
%, Preferably in the range of 40 to 70% by weight.

(3) Other Ingredients In addition to the above-described composition, known additives can be added to the ink image-receiving layer as needed. Examples of such additives include a dispersant, a water retention agent, a thickener, a defoaming agent, a release agent, a colorant, a waterproofing agent, a wetting agent, and a fluorescent dye.

Further, in order to further increase the water absorbency of the matte ink jet recording sheet, a superabsorbent polymer may be added to the ink image receiving layer. As the superabsorbent polymer, one or more superabsorbent polymers selected from the group consisting of polyacrylic acid, polystyrenesulfonic acid, polyvinylsulfonic acid, polymethacrylic acid and salts thereof can be used. . Among them, it is particularly preferable to use polymethacrylic acid or the like.

[C] Others The matte ink jet recording sheet of the present invention comprises the above-mentioned base sheet and ink image-receiving layer, but may optionally have various optional layers. For example, a primer layer can be provided between the base sheet and the ink receiving layer in order to improve the adhesion between the ink receiving layer and the base sheet. As such a primer layer, one or more kinds of primers selected from polyurethane-based, polyester-based, and polyacryl-based groups can be used. Further, an aluminum vapor-deposited layer may be provided on the back of the base sheet in order to enhance the image concealing property on the back, or a barrier layer or the like for preventing ink from penetrating into the back may be provided.

[2] Manufacturing method of matte ink jet recording sheet First, the components of the ink image receiving layer are added to a solvent so as to have a concentration suitable for coating and mixed to prepare a coating liquid for the ink image receiving layer. As the solvent, at least one selected from water, alcohol, glycols and the like is used.

The obtained coating liquid is dried (at a temperature of 100 ° C.).
(Approximately 150 ° C., 3 to 15 minutes) in a range of 5 to 50 μm so that the well-known applicator method, bar coater method, roll coating method, spray coating method, die coating method, lip coating method, The upper surface of the substrate sheet is applied using an air knife coating method.

[0020]

The present invention will be described in more detail with reference to the following Examples, but it should not be construed that the invention is limited thereto.

Example 1 A 100 μm-thick white polyethylene terephthalate film (manufactured by Mitsubishi Chemical Polyester Film Co., Ltd.) was used as a substrate, and a coating solution having the following composition was applied to the film by an applicator. 110 ° C, 5
After drying under the conditions of minutes, a matte inkjet recording sheet was obtained. The coating amount after drying was 10 g / m ² .

Table 1 Composition of coating solution Binder: Kuraray Co., Ltd., PVA-217 6 g Cellulose fine powder: Rengo Co., Ltd., Resphere Co., Ltd. Average particle size 5-25 μm 6 g Solvent: water 88 g

The matte ink jet recording sheet of the present invention thus obtained was printed using an ink jet printer “Design Jet” (ink) manufactured by Hewlett-Packard Japan, Ltd. The following test was performed on the sample after printing. Table 7 shows the test results.

(1) Image Bleeding Test The color boundary bleeding of the printed matter on the white polyethylene terephthalate film was visually observed. The evaluation is as follows. ◎: very good (no border bleeding at all) ：: Good (slight bleeding was observed). Δ: Normal (bleeding). X: Poor (significant bleeding).

(2) Printing Unevenness Test The printing unevenness of the printed matter on the white polyethylene terephthalate film was visually observed. The evaluation is as follows. ◎: Very good (no beading). ：: Good (slight beading was observed). Δ: Normal (beading occurred). ×: defective (significant beading occurred)

(3) Drying test Seven minutes after printing, the printed portion was observed by finger touch. The evaluation is as follows. ◎: very good (no wet feeling at all) ：: Good (almost no wet feeling). Δ: Normal (the ink did not adhere to the finger, but a slight wet feeling remained). X: Poor (ink adhered to finger).

Comparative Example 1 A matte inkjet recording sheet was prepared in exactly the same manner as in Example 1 except that a coating solution having the following composition was used.

Table 2 Composition of coating liquid Binder: Kuraray Co., Ltd. PVA-217 6 g Silka fine powder: Fuji Silysia Chemical Co., Ltd. Sylysia 450 Average particle size 5.2 μm 6 g Solvent: water 88 g

The same test as in Example 1 was performed on the matte ink jet recording sheet thus obtained. Table 7 shows the test results.

Comparative Example 2 A matte inkjet recording sheet was prepared in exactly the same manner as in Example 1 except that a coating solution having the following composition was used.

Table 3 Composition of coating liquid Binder: 15 g of Kuraray Co., Ltd. PVA-217 Solvent: 85 g of water

The matte ink jet recording sheet thus obtained was subjected to the same test as in Example 1. Table 7 shows the test results.

Example 2 A matte inkjet recording sheet was prepared in exactly the same manner as in Example 1 except that the coating amount after drying the ink image receiving layer was 13 g / m ² using a coating liquid having the following composition. did.

Table 4 Composition of Coating Solution Binder: Kuraray Co., Ltd., PVA-405 6 g Cellulose fine powder: Rengo Co., Ltd., Refeasia Average particle size 5-25 μm 6 g Solvent: water 88 g

The thus obtained matte ink jet recording sheet of the present invention was printed using an ink jet printer “Master Jet” (ink) manufactured by Graphtec Co., Ltd. The same test as in Example 1 was performed on the sample after printing. Table 7 shows the test results.

Comparative Example 3 A matte inkjet recording sheet was prepared in exactly the same manner as in Example 1 except that a coating solution having the following composition was used.

Table 5 Composition of coating liquid Binder: Kuraray Co., Ltd. PVA-405 6 g Silka fine powder: Fuji Silysia Chemical Co., Ltd. Sylysia 450 Average particle size 5.2 μm 6 g Solvent: water 88 g

The same test as in Example 2 was performed on the matte ink jet recording sheet thus obtained. Table 7 shows the test results.

Comparative Example 4 A matte ink jet recording sheet was prepared in exactly the same manner as in Example 1 except that a coating solution having the following composition was used.

Table 6 Composition of coating liquid Binder: Kuraray Co., Ltd. PVA-405 15 g Solvent: water 85 g

The same test as in Example 2 was performed on the matte ink jet recording sheet thus obtained. Table 7 shows the test results.

Table 7 Evaluation Test Sample Binder Fine Particle Ink Bleeding Unevenness Drying Example 1 PVA-217 Cellulose Ink ◎ ◎ ◎ Comparative Example 1 Same as above Silica Same as above ○ △ ○ Comparative Example 2 Same as above-Same as above ◎ ◎ × Example 2 PVA-405 Cellulose ink ○ ○ ○ Comparative Example 3 Same as above Silica Same as above × × × Comparative Example 4 Same as above ― Same as above △ × △

From Table 7, it can be seen that the matte ink jet recording sheets of Examples 1 and 2 to which cellulose fine particles were added were as follows:
Compared to Comparative Examples 1 to 4, it can be seen that all of the ink bleeding, unevenness, and dryness are excellent.

[0044]

As described in detail above, since the matte ink jet recording sheet of the present invention contains cellulose fine powder in the ink image receiving layer, even if a large amount of ink is used without using a dye fixing agent. A matte inkjet recording sheet without bleeding or beading can be obtained.

[Brief description of the drawings]

FIG. 1 is a schematic sectional view showing an example of a matte inkjet recording sheet of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Matt ink jet recording sheet 2 ... Ink image receiving layer 3 ... Base material sheet

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI theme coat ゛ (Reference) C08L 33/26 C08L 39/02 39/02 39/06 39/06 67/00 67/00 71/02 71 / 02 77/00 77/00 79/02 79/02 C09D 101/02 C09D 101/02 201/00 201/00 D06M 15/05 D06M 15/05 B41J 3/04 101Y F-term (reference) 2C056 EA05 EA06 FB06 FB02 FB03 FC06 2H086 BA15 BA19 BA21 BA22 BA31 BA34 BA45 4J002 AB01W BE02X BF02X BG13X BJ00X CF00X CH02X CL00X CM01X FA08W HA04 HA07 4J038 BA022 CE021 CF021 CG171 CK031 DD001 DF021

Claims (4)

[Claims] 1. A matte ink jet recording sheet comprising an ink image receiving layer containing at least a cellulose fine powder and a binder on a surface thereof. 2. The matte inkjet recording sheet according to claim 1, wherein the cellulose fine powder is cellulose fine particles having an average particle size of 50 μm or less. 3. The matte inkjet recording sheet according to claim 1, wherein the binder is polyvinyl alcohol, polyethylene oxide, polypropylene oxide, polyvinylpyrrolidone, polyacrylamide, a water-soluble polyester resin, polyvinyl acetate, or a water-soluble polyamide. A matte inkjet recording sheet, which is at least one selected from the group consisting of resin, polyethyleneamine, polyethylenepolyamine, and polyallylamine. 4. The matte inkjet recording sheet according to claim 1, wherein the base sheet of the matte inkjet recording sheet is any one of a plastic film, paper, glass, and cloth. Matte inkjet recording sheet.