JP2007261221A - Ink jet recording sheet for interior finishing material - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an ink jet recording sheet for an interior finishing material in which there is neither bleeding nor printing unevenness, a coloring nature is good and which has a concavo-convex texture in an ink jet aptitude. <P>SOLUTION: In the ink jet recording sheet for the interior finishing material having an ink acceptance layer containing a pigment and a binder at least in one side on a support, at least one type of the pigment in the ink acceptance layer is a silica having 20-30 μm of mean particle diameters at least, and embossing is performed. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a sheet for interior material provided with an uneven texture by embossing used for interior materials such as wallpaper, and in particular, an image can be recorded by an ink jet method, and bleeding and print unevenness do not occur, and color developability. The present invention relates to an ink jet recording sheet for an interior material that has a good quality.

In recent years, interior decoration materials for interior decoration have been used in many cases along with the upgrading and diversification of living spaces. on the other hand,
It is desired to provide interior materials having originality that meets customer needs.
Instead of wallpaper produced in large quantities on a printing press, small lots and original interior materials that record images and images that are unique to inkjet printers are required.
As such an interior material, an ink-receiving layer is formed on a base paper containing a large amount of inorganic pigment, and an ink jet recording paper (for example, see Patent Document 1) and non-foamed particles formed with an uneven pattern. An interior material sheet or the like in which a recording layer containing a water-insoluble binder having a glass transition point of −30 to 70 ° C. is provided on one side of a low-density paper and a concavo-convex pattern is formed by molding is proposed (for example, , See Patent Document 2).
However, the ink jet recording paper described in Patent Document 1 and the interior material sheet described in Patent Document 2 have recording suitability by temporary ink jet recording, but for the purpose of improving the print preparation, the amount of ink discharged When printing in a mode with a large amount of ink, there was a problem that the print portion was blurred.

JP-A-8-2096 JP 2004-230883 A

  The present invention provides an ink jet recording sheet for an interior material that is free from blurring and printing unevenness, has good color developability, and has an uneven texture.

  As a result of diligent investigations, the present inventors have found that the ink-receiving layer contains silica having an average particle diameter of 20 to 30 μm as a pigment having a function as a spacer in the ink receiving layer, and embossed. The inventors have found that this can be achieved and have reached the present invention.

 (1) In an ink jet recording sheet for an interior material provided with an ink receiving layer containing a pigment and a binder on at least one surface on a support, at least one of the pigments in the ink receiving layer is silica having an average particle size of 20 to 30 μm. An ink jet recording sheet for interior materials, which is embossed.

The present invention also includes the following aspects.
(2) The inkjet recording sheet for interior materials according to (1), wherein the thickness of the ink receiving layer is 0.8 to 1.2 times the average particle diameter of the silica.

  According to the present invention, it is possible to obtain an ink jet recording sheet for an interior material that is free from blurring and uneven printing, has good color developability, and has an uneven texture by embossing.

The present invention is described in detail below.
<Support>
The support according to the present invention is not particularly limited, and examples thereof include a sheet-like paper substrate, a film, a joined product of a film and a sheet-like paper substrate, and the support has water absorption. Sheets are preferred.
There is no particular limitation on the manufacturing method and type of pulp constituting the sheet-like paper substrate, for example, chemical pulp such as KP, mechanical pulp such as SGP, RGP, BCTMP, CTMP, waste paper pulp such as deinked pulp, kenaf, Non-wood pulp such as bamboo, straw, hemp, etc. is used. In addition, organic synthetic fibers such as polyamide fibers and polyester fibers, recycled fibers such as polynosic fibers, and inorganic fibers such as glass fibers, ceramic fibers, and carbon fibers can be mixed. Among these, use of chlorine-free pulp such as ECF pulp and TCF pulp is preferable.
In addition, a filler may be blended in the sheet-like paper substrate as necessary. As the filler, various pigments generally used for fine paper can be used, such as kaolin, calcined kaolin, calcium carbonate, calcium sulfate, barium sulfate, titanium dioxide, talc, zinc oxide, alumina, magnesium carbonate, magnesium oxide, Inorganic pigments such as alumina silicate, silica, white carbon, bentonite, zeolite, sericite and smectite, inorganic pigments with endothermic dehydration reactions such as aluminum hydroxide, magnesium hydroxide and various inorganic hydrates, and polystyrene resins And organic pigments such as fine hollow particles, dense particles and through-hole particles of urea resins, melamine resins, acrylic resins and vinylidene chloride resins. These fillers may be used alone or in combination of two or more depending on the purpose.

In addition to the pulp fibers and fillers, various anionic, nonionic, and cationic materials that have been used in the past are included in the paper material when the sheet-like paper substrate is made, as long as the desired effects of the present invention are not impaired. Various auxiliary agents for papermaking such as a neutrality or amphoteric yield improver, freeness improver, paper strength enhancer, and internal sizing agent can be appropriately selected and used as necessary. Furthermore, internal additives for papermaking such as dyes, fluorescent brighteners, pH adjusters, antifoaming agents, pitch control agents, slime control agents and the like can be added as necessary.
The paper-making method of the sheet-like paper substrate is not particularly limited, and all paper-making methods can be applied. As the paper machine, a long net paper machine, a twin wire paper machine, a circular paper machine, and a Yankee paper machine are used as appropriate. be able to.
On one or both sides of the sheet-like paper substrate obtained by the above method, starch, polyvinyl alcohol, surface sizing agent, cationic resin, anionic resin, nonionic resin, pigment, surfactant, pH regulator, viscosity modifier Agent, softener, gloss imparting agent, waxes, dispersant, flow modifier, stabilizer, antistatic agent, crosslinking agent, sizing agent, fluorescent brightener, colorant, ultraviolet absorber, antifoaming agent, water resistance 1 type or 2 types or more of various auxiliary agents such as plasticizers, plasticizers, lubricants, preservatives, and fragrances may be appropriately adjusted and applied. Can be used as a support.

The mass of the support according to the present invention (basis weight) is not particularly limited, is used in the range of usually ^{30g / m 2 ~300g / m 2} .

<Ink receiving layer>
An ink receiving layer containing a pigment and a binder is provided on the surface of the support.

(Pigment)
As the pigment, silica having an average particle diameter of 20 to 30 μm is preferable because it has a function as a spacer pigment and has good ink drying properties, printing blemishes, and printing unevenness. The average particle size of silica is 20μ
When it is less than m, the function as a spacer pigment is weakened, and when the embossing is performed, the ink receiving layer is crushed, the texture of the unevenness is eliminated, the voids in the ink receiving layer are reduced, and the ink drying property is lowered. , Print blemishes worsen. When the average particle diameter exceeds 30 μm, printing unevenness occurs. Although it does not specifically limit as a silica, For example, a vapor phase method silica, a wet method silica, etc. are mentioned.
It is preferable that the compounding part number of the silica with an average particle diameter of 20 to 30 μm is 10 to 30 parts by mass in 100 parts by mass of the pigment. When the amount is less than 10 parts by mass, the ink receiving layer is crushed when embossing is performed, the voids in the ink receiving layer are reduced, and the ink drying property is lowered, so that the printing blurring tends to be deteriorated, and 30% by mass. If it exceeds the area, uneven printing tends to occur. When a pigment having poor ink absorbability other than silica, such as an organic pigment or calcium carbonate, is used, it has a function as a spacer pigment as long as the average particle size is 20 to 30 μm. Since the ink is not absorbed, the printing unevenness is remarkably deteriorated.
As a pigment used in combination with silica having an average particle diameter of 20 to 30 μm, silica having an average particle diameter of 1 to 10 μm is particularly preferable because it has good printing density, printing bleed and ink drying properties. When the average particle diameter is less than 1 μm, printing blurring occurs and ink drying properties are reduced. When the average particle diameter exceeds 10 μm, the print density decreases.
In addition to the above pigment, other pigments may be blended as necessary. Examples of the pigment used in this case include kaolin, clay, calcined clay, zinc oxide, aluminum oxide, aluminum hydroxide, Calcium carbonate, silica composite calcium carbonate with silica supported on calcium carbonate, satin white, aluminum silicate, alumina, colloidal silica, zeolite, synthetic zeolite, sepiolite, smectite, synthetic smectite, magnesium silicate, magnesium carbonate, magnesium oxide, diatomaceous earth, Styrene plastic pigment, hydrotalcite, urea resin plastic pigment, benzoguanamine plastic pigment, styrene, ethylene, butadiene, vinyl chloride, polyurethane, acrylic, vinyl acetate, Various pigments known in the general coated paper production field such as organic polymer fine particles of recarbonate, nylon, and copolymers thereof may be mentioned, and one or more of these may be appropriately selected depending on the purpose. Select and use.

(binder)
The well-known binder used for the conventional coated paper can be used. Polyvinyl alcohol and its derivatives, cellulose derivatives such as carboxymethylcellulose and hydroxyethylcellulose, polyvinylpyrrolidone, casein, gelatin, soy protein, starch, styrene-acrylic resin and its derivatives, styrene-butadiene latex, acrylic emulsion, vinyl acetate emulsion, vinyl chloride Emulsions, urethane emulsions, urea emulsions, alkyd emulsions and derivatives thereof may be used in combination.

Although the compounding quantity of a binder is not specifically limited, It is preferable to set it as 5-50 mass parts with respect to 100 mass parts of pigments, and it is more preferable to set it as 10-40 mass parts. When the blending amount is less than 5 parts by mass, the coating film strength tends to decrease, and when it exceeds 50 parts by mass, the ink absorbability tends to decrease.

(Other ingredients)
In addition to the above components, the ink-receiving layer may contain a pigment dispersant, a water retention agent, a thickening agent, an antifoaming agent, an antiseptic, a colorant, a water resistance agent, a wetting agent, a fluorescent dye, an ultraviolet absorber, A cationic polymer electrolyte or the like can be appropriately added.

(thickness)
The thickness of the ink receiving layer is not particularly limited, but a thickness in the range of 5 to 50 μm is usually used.
The thickness of the ink receiving layer is preferably 0.8 to 1.2 times, more preferably 0.85 to 1.15 times the average particle diameter of the spacer pigment. If it is less than 0.8 times, printing blurring occurs, and if it exceeds 1.2 times, printing unevenness occurs.

<Coating device>
The method for coating the ink receiving layer is not particularly limited, and a commonly used coating apparatus is used.
For example, blade coater, air knife coater, spray coater, rod blade coater, roll coater, reverse roll coater, bar coater, curtain coater, die slot coater, gravure coater, champlex coater, brush coater and two-roll coater, and metering blade A device such as a size press coater, bill blade coater, short dwell coater, lip coater or gate roll coater of the type can be used. Coating is performed either on-machine or off-machine.

<Embossing>
After the ink receiving layer is provided on the surface of the support, embossing is performed in order to give an uneven texture to the surface of the inkjet recording sheet for interior materials. When embossing is performed, the shape of the engraving roll mold, the elastic roll material, the nip pressure, the processing speed, the engraving roll temperature, and the like are adjusted. For example, the unevenness of the engraving roll may be 30 μm or more, preferably about 100 to 500 μm, and an elastic roll having a Shore hardness of 80 to 89 degrees may be combined. If the elastic roll has an uneven shape corresponding to the uneven shape of the engraving roll, deeper embossing can be performed. Further, if the hardness of the elastic roll is 84 to 89 degrees, deep molding can be performed. The nip pressure between the engraving roll and the elastic roll may be appropriately adjusted in consideration of the thickness of the inkjet recording sheet for interior materials, the thickness of the low density paper, and the thickness of the recording layer. Further, when the processing speed is slow, the obtained concave portion becomes deep. Moreover, when the temperature of the engraving roll is increased, the obtained recess becomes deeper. However, if the nip pressure is increased, the processing speed is slow, and the engraving roll temperature is increased, the recording layer having the pigment tends to adhere to the engraving roll and peel off, and thus adjustment is necessary.

  A pressure-sensitive adhesive layer can also be formed on the support surface (the surface not having the recording layer) of the ink jet recording sheet for interior materials of the present invention. Of course, the pressure-sensitive adhesive layer may be protected by a protective sheet having a release agent layer. Since the sheet | seat for interior materials of such a structure should just peel and stick a protective sheet in the case of sticking, it is preferable from operation because it is simple. The pressure-sensitive adhesive may be appropriately selected from a pressure-sensitive adhesive, a heat-sensitive adhesive, a rewet adhesive, and the like. Among these, a solventless pressure-sensitive adhesive is preferable.

  The ink jet recording sheet for an interior material of the present invention may be provided with an ink receiving layer on an undercoat layer on a support, if necessary, and an overcoat on an ink receiving layer. A layer may be provided.

  These ink-jet recording sheets for interior materials have both a surface texture and recording suitability that have never been known.

  The present invention will be specifically described by the following examples, but of course, they are not intended to limit the scope of the present invention. In the examples, “parts” and “%” represent “parts by mass (solid component)” and “mass%” unless otherwise specified.

<Example 1>
(Production of support)
Hardwood bleached kraft pulp 100 parts, light calcium carbonate 15 parts, cationic starch (trade name: Kate F, manufactured by Oji National) 0.3 parts, paper strength enhancer (trade name: Polymaron 619, manufactured by Arakawa Chemical Industries) 0 .1 part, water added to 0.08 part of alkyl ketene dimer sizing agent (SPK903, manufactured by Arakawa Chemical Industries) and mixed well to prepare a stock with a slurry concentration of 0.05%. A support having a basis weight of 160 g / m ² was prepared using a long mesh multi-cylinder paper machine.

[Preparation of paint for ink receiving layer]
As a pigment having a function as a spacer, 0.2 part of a dispersant (trade name: Emulgen A60, manufactured by Kao Corporation) is added to 20 parts of silica (trade name: Nipseal AQ, manufactured by Tosoh Silica Co., Ltd.). The mixture was dispersed in water and wet-pulverized so that the average particle size was 22.0 μm to prepare a pigment slurry. In this pigment slurry, 80 parts of amorphous silica (trade name: Fine Seal X-60, average particle size 6.2 μm) as a pigment to be used in combination, and silyl-modified polyvinyl alcohol (trade name, manufactured by Kuraray Co., Ltd.) as a binder are used. : R-1130) 20 parts and acrylic resin (trade name: LA327E1, manufactured by Nichigomo Vinyl) 20 parts, and further cationic resin (trade name: Unisense CP-101, Senka Co., Ltd.) 20 parts, water Was added to prepare a paint having a solid content of 20%.

[Preparation of inkjet recording sheet]
The ink-receiving layer coating was applied to the 160 g / m ² support surface obtained above using an air knife so that the dry coating weight per side was 20.0 g / m ² and dried. A recording sheet was prepared. Table 1 also shows the results of ink jet aptitude evaluation of the obtained ink jet recording sheet.
[Embossing and production of inkjet recording sheet for interior materials]
The obtained ink jet recording sheet is embossed using an engraving roll having a mesh pattern with an uneven depth of 100 μm, and the recording layer surface of the ink jet recording sheet becomes an engraving roll, and for interior use having a mesh pattern An ink jet recording sheet was prepared. The thickness of the ink receiving layer confirmed by electron microscopic tomography was 24 μm. The obtained results are shown in Table 1.

<Example 2>
An ink jet recording sheet was prepared in the same manner as in Example 1 except that wet pulverization was performed so that the silica in the pigment slurry in the ink receiving layer had an average particle size of 28.0 μm. The thickness of the ink receiving layer confirmed by electron microscopic tomography was 28 μm. The obtained results are shown in Table 1.

<Example 3>
An ink jet recording sheet was prepared in the same manner as in Example 1, except that the ink-receiving layer was coated so that the dry coating mass per side was 10.0 g / m ² . The thickness of the ink receiving layer confirmed by electron microscopic tomography was 15 μm. The obtained results are shown in Table 1.

<Example 4>
An ink jet recording sheet was prepared in the same manner as in Example 1 except that the ink receiving layer was coated so that the dry coating mass per side was 30.0 g / m ² . The thickness of the ink receiving layer confirmed by electron microscopic tomography was 32 μm. The obtained results are shown in Table 1.

<Example 5>
In Example 1, 5 parts by mass of silica (trade name: Nipseal AQ, manufactured by Tosoh Silica Co., Ltd.) as a pigment having a function as a spacer in the paint of the ink receiving layer, and silica (Tokuyama Co., Ltd.) as a pigment to be used in combination. An ink jet recording sheet was produced in the same manner as in Example 1 except that the mass blending part of the product, trade name: Fine Seal X-60, average particle size 6.2 μm) was 95 parts. The thickness of the ink receiving layer confirmed by electron microscopic tomography was 24 μm. The obtained results are shown in Table 1.

<Example 6>
In Example 1, 40 parts by mass of silica (trade name: NIPSEAL AQ, manufactured by Tosoh Silica Co., Ltd.) as a pigment having a function as a spacer in the paint of the ink receiving layer, and silica (Tokuyama Co., Ltd.) as a pigment to be used together An ink jet recording sheet for an interior material was produced in the same manner as in Example 1 except that the mass blended part of the product, trade name: Fine Seal X-60, average particle size 6.2 μm) was changed to 60 parts. The thickness of the ink receiving layer confirmed by electron microscopic tomography was 24 μm. The obtained results are shown in Table 1.

<Comparative Example 1>
In Example 1, 100 parts of amorphous silica (manufactured by Tokuyama Corporation, trade name: Fine Seal X-60, average particle size 6.2 μm) was used as the pigment for the ink-receiving layer, and silyl-modified polyvinyl alcohol (Kuraray Co., Ltd.) was used as the binder. Product name: R-1130) 20 parts and acrylic resin (trade name: LA327E1, manufactured by Nichigomo Vinyl) 20 parts, and cationic resin (trade name: Unisense CP-101, Senka Corporation) 20 parts And an ink jet recording sheet for interior use was prepared in the same manner as in Example 1 except that water was added to prepare a paint having a solid content of 20%. The thickness of the ink receiving layer confirmed by electron microscopic tomography was 18 μm. The obtained results are shown in Table 1.

<Comparative example 2>
In Example 1, an ink jet recording sheet for interior use was prepared in the same manner as in Example 1 except that the silica in the pigment slurry in the ink receiving layer was subjected to wet pulverization so that the average particle size was 15.0 μm. did. The thickness of the ink receiving layer confirmed by electron microscopic tomography was 22 μm. The obtained results are shown in Table 1.

<Comparative Example 3>
An ink jet recording sheet was prepared in the same manner as in Example 1, except that the wet pulverization treatment was performed so that the silica in the pigment slurry in the ink receiving layer had an average particle diameter of 35.0 μm. The thickness of the ink receiving layer confirmed by electron microscopic tomography was 30 μm. The obtained results are shown in Table 1.

<Comparative example 4>
In Example 1, 20 parts of polymethacrylic acid particles (manufactured by Sekisui Plastics Co., Ltd., trade name: Techpolymer MB-50, average particle diameter 20 μm) are used in combination as a pigment having a function as a spacer of the paint of the ink receiving layer. 80 parts of amorphous silica (trade name: Fine Seal X-60, average particle size 6.2 μm) as a pigment, 20 parts of silyl-modified polyvinyl alcohol (trade name: R-1130, manufactured by Kuraray Co., Ltd.) as a binder And 20 parts of acrylic resin (trade name: LA327E1, manufactured by Nichigomo Vinyl Co., Ltd.), 20 parts of cationic resin (trade name: Unisense CP-101, Senka Co., Ltd.) are added, water is added, and the solid content concentration is 20 An ink jet recording sheet for interior use was produced in the same manner as in Example 1 except that a coating material of% was prepared. The thickness of the ink receiving layer confirmed by electron microscopic tomography was 22 μm. The obtained results are shown in Table 1.

[Recordability]
Next, the ink jet large format printer (trade name: hp designjet 5000PS, pigment ink type, printing mode: UV backlight film (printing mode with a large ink discharge amount), Hewlett-Packard An image was recorded using an ink jet recording sheet for an interior material, and the following evaluation was performed.

"Nijimi"
The blurring state of adjacent portions of different colors was visually evaluated. As a result, it was rated as ○ when the blur was hardly observed, Δ when the blur was slightly observed but having no practical problem, and × when the blur was too large to be practically used.

"Print unevenness"
From the print samples evaluated for ink absorbency, image quality related to bleeding, print unevenness, and color developability was evaluated.
○: The printed part is uniform and good.
○-: Printing unevenness is slightly observed but there is no problem.
Δ: Some printing unevenness is observed and there is a problem.
X: The printing unevenness is severe and there is a problem.

"Color development"
The density of the solid print portion of the mixed black and cyan ink by the mixed color of cyan, magenta and yellow was visually evaluated. As a result, a sample showing an excellent print density was rated as ◯, a sample that was slightly thin but having no practical problem, and a sample that was too thin to withstand practical use was rated as ×.

[Suitability for interior material sheets]
The following evaluation was performed about the inkjet recording sheet for interior materials which gave the obtained embossing.

"Embossing aptitude"
The method of entering the uneven pattern by embossing was observed.
○: The uneven pattern is neatly ×: The uneven pattern is unclear

表１からわかるように、本発明の内装用インクジェット記録シートは、ニジミや印字ムラが発生せず、画質が良好で、かつエンボス加工による凹凸風合いを有している。（実施例１〜６）。
一方、スペーサー顔料をインク受容層中に含有しない場合やスペーサー顔料の平均粒子径が２０μｍ未満である場合は、ニジミが劣る。（比較例１、２）。
また、スペーサー顔料の平均粒子径が３０μｍを超える場合やインク吸収性の劣る有機顔料をスペーサー顔料として使用した場合は、印字ムラが劣る。（比較例３、４）。

As can be seen from Table 1, the ink jet recording sheet for interior use according to the present invention does not cause blurring or uneven printing, has good image quality, and has an uneven texture due to embossing. (Examples 1-6).
On the other hand, when the spacer pigment is not contained in the ink receiving layer, or when the average particle size of the spacer pigment is less than 20 μm, the blurring is inferior. (Comparative Examples 1 and 2).
In addition, when the average particle diameter of the spacer pigment exceeds 30 μm or when an organic pigment having poor ink absorbability is used as the spacer pigment, printing unevenness is inferior. (Comparative Examples 3 and 4).

The ink jet recording sheet for interior use according to the present invention has an uneven texture by embossing, and in addition, in applicability to ink jet, no blurring or printing unevenness is generated, the color developability is good, and it is extremely useful in practice.

Claims (2)

In an inkjet recording sheet for an interior material provided with an ink receiving layer containing a pigment and a binder on at least one side of a support, at least one of the pigments in the ink receiving layer is silica having an average particle size of 20 to 30 μm, and embossed An inkjet recording sheet for interior materials, characterized by being processed. The inkjet recording sheet for an interior material according to claim 1, wherein the thickness of the ink receiving layer is 0.8 to 1.2 times the average particle diameter of the silica.