JP2002103800A - Recording material for ink jet printer and its manufacturing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a recording material for an ink jet printer exhibiting excellent color developability as for an internal illumination type electrolytic corrosion at a low cost by reducing a base layer of an acceptive layer, and a method for manufacturing the same. SOLUTION: The recording material for the ink jet printer comprises an adhesive layer 3 laminated on a releasable film 4 and having a total ray transmittance obtained by dispersing light scattering fine particles 7 of 10 to 40%, and an ink acceptive layer film 2 containing inorganic particles and an oil absorbable or water absorbable binding agent and laminated on the layer 3. The method for manufacturing the recording material for the ink jet printer comprises the steps of forming the ink acceptive layer film 2 on a releasable carrier 5, then laminating the ink acceptive layer film and the layer 3 having the total ray transmittance obtained by dispersing light scattering fine particles 7 of 10 to 40% formed by coating and drying on the film 4, and releasing the carrier 5 and the film 2 before the ink acceptive layer film and the adhesive layer are laminated or during laminating or after laminating.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a recording material for an ink jet printer having a reduced number of laminated structures, and a method for producing the same, which is used in a bonding operation.

[0002]

2. Description of the Related Art In an ink jet printing method, a very small amount of ink of 4 to 6 primary colors is ejected from a recording nozzle, and an ink head of each color and a recording paper are arbitrarily moved two-dimensionally, and a digital image is left as it is. It is a system that can output to recording paper, and in recent years, as a system that can print a large image in a short time and at a low cost, is rapidly spreading in the signboard and display industries. Conventionally, recording paper for an ink jet printer is generally coated with a liquid in which a material for forming an ink receiving layer is dissolved or dispersed on a paper or film serving as a substrate (1) as shown in FIG. It was obtained by forming an ink receiving layer (2) (for example,
No. 151476).

[0003] When this recording paper is used for decoration or display purposes, in order to adhere the base material (1) to the adherend,
Laminate the adhesive layer (3) with release paper (31) in advance,
Or, it was fixed to the adherend later with an adhesive or a double-sided tape.

Further, when an image obtained by the ink jet printing method is displayed outdoors or held for a long period of time, the receiving layer after printing is required to ensure the abrasion resistance, water resistance, weather resistance, etc. of the receiving layer. On the surface of the, laminating an over-laminated film with a resin base film,
It has been practiced to provide a top coat layer made of a clear paint.

[0005]

The type of the substrate 1 is, for example, polyethylene terephthalate (PE).
T), polyethylene (PE), polypropylene (P
P), films made of thermoplastic resin such as polyvinyl chloride (PVC), knitted fabric such as cloth and canvas, and PV
There are a wide variety of materials and forms, such as tents impregnated with a resin such as C, and it is inconvenient in terms of industrial production to prepare all of them when manufacturing recording materials. Therefore, if the base material can be omitted, not only the cost of the material itself but also various types of base material management becomes unnecessary, so that a recording material for an ink jet printer can be provided at a lower cost, which is desirable. .

Further, in the conventional ink-jet image expression, when these are used for decoration of an internally illuminated type, such as a signboard or a display, especially in the case of an ink-jet type in which a pigment is used as a colorant, the color is not sufficiently improved. There was a problem that the coloring of the agent was insufficient, the overall image was thin, and a sufficient decorative effect could not be obtained.

In view of the above-mentioned problems of the conventional recording material for an ink jet printer, the present invention has reduced the number of base layers of the receiving layer, which has been indispensable for securing the strength and the color developing function of white. It is an object of the present invention to provide a recording material for an ink-jet printer which is inexpensive and has excellent coloring properties for interior illumination type electric decoration, and a method for producing the same.

[0008]

In order to achieve the above object, according to the first aspect of the present invention, the light scattering fine particles laminated on the release film have a total light transmittance of 10 to 10.
Provided is a recording material for an ink jet printer in which an ink receiving layer film containing inorganic particles and an oil-absorbing or water-absorbing binder is laminated on a 40% pressure-sensitive adhesive layer.

Further, the invention according to claim 2 provides an ink receiving layer film comprising inorganic particles and an oil-absorbing or water-absorbing binder formed on a release carrier, and then forming an ink-receiving layer film. A pressure-sensitive adhesive composition in which light-scattering fine particles are dispersed on a release film, and a pressure-sensitive adhesive layer having a total light transmittance of 10 to 40% formed by drying and laminating; Before lamination of the receiving layer film and the adhesive layer,
A method for producing a recording material for an ink jet printer according to claim 1, wherein the release carrier and the ink receiving layer film are separated during or after lamination. Hereinafter, the present invention will be described in more detail.

As shown in FIG. 1, the recording material for an ink jet printer according to the present invention has a pressure-sensitive adhesive layer (3) in which light scattering fine particles (7) are dispersed on a release film (4). Further, the ink receiving layer film (2) is laminated on the pressure-sensitive adhesive layer (3). As the release film, conventionally known films can be used as long as they have release properties,
For example, a film made of a thermoplastic resin such as polyester or polyolefin typified by polyethylene terephthalate, a film obtained by coating paper with a release agent made of silicone or a polyolefin-based wax, and the like can be given. Although the thickness of the release film is not particularly limited, it is usually about 50 to 200 μm.
A range of 0 μm is preferred.

The pressure-sensitive adhesive constituting the pressure-sensitive adhesive layer is not particularly limited, and conventionally known pressure-sensitive adhesives can be used, for example, those containing a synthetic rubber, an acrylic resin, a silicone resin, a natural rubber as a main component, and the like. However, considering the interior illumination type illumination application, if a component having a hue other than white is used, a change in the hue when viewed with transmitted light will cause a change in the color of highly transparent acrylic resin, silicone resin, etc. preferable. The thickness of the pressure-sensitive adhesive layer is not particularly limited, and is usually 20 to 100 μm.
Although it is on the order of magnitude, it is more advantageous to secure a certain thickness in order to secure the light scattering properties of the light scattering fine particles, so the range of 40 to 100 μm is preferable.

As the light-scattering fine particles dispersed in the pressure-sensitive adhesive layer, titanium oxide, pearl pigment, glass beads and the like are used, and usually have a particle size of about 0.1 to 10 μm.
Light scattering fine particles are responsible for improving the color development of the ink, the content ratio in the adhesive layer, 100 parts by weight of the adhesive,
Usually, it is 10 to 100 parts by weight.

When the content of the light-scattering fine particles is too small, the coloring properties become insufficient. On the other hand, when the content is too large, the light transmittance is lowered and the brightness at the time of internal illumination is insufficient, so that the electric decoration effect is reduced. This is because the adhesive properties are also adversely affected. The total light transmittance of the pressure-sensitive adhesive layer is from 10 to 40%, preferably from 20 to 30%, by appropriately setting the content and thickness of the light-scattering fine particles.

The ink receiving layer film contains inorganic particles and an oil absorbing or water absorbing binder. The inorganic particles are not particularly limited as long as they have absorptivity to the ink to be used, and examples thereof include porous materials having a particle diameter of generally several μm or less, such as silica, alumina, and zeolite.

Examples of the oil-absorbing binder include lipophilic materials such as aliphatic, alicyclic and aromatic resins and low crystalline elastomers such as polyisoprene and polybutadiene. Examples of the water-absorbing binder include hydrophilic materials such as polyvinyl alcohol, polyvinyl acetal, polyvinyl pyrrolidone, polyester, and polyacrylic acids. These may be mixed and cross-linked in a solvent having a high affinity such as water alcohol, and if they have a film forming property at the time of coating, depending on the required printing performance, etc., the ink having an appropriate thickness together with the inorganic particles. A receiving layer film can be formed.

The above-mentioned inorganic particles usually contain the above-mentioned binder 100
About 5 to 200 parts by weight is blended with respect to parts by weight. If the amount is less than 5 parts by weight, the water absorption rate of the ink receiving layer film is low, and the printed image is not clear. If the amount exceeds 200 parts by weight, the water resistance of the ink receiving layer film is deteriorated.

Further, the ink receiving layer material may contain an inorganic electrolyte in order to improve the ink absorbency.
Examples of the inorganic electrolyte include sodium chloride and the like. In this case, about 2 to 10 parts by weight of the inorganic electrolyte is usually blended with respect to 100 parts by weight of the binder.

In the present invention, the ink receiving layer includes:
The addition of various additives such as a heat stabilizer, an antioxidant, and a coloring agent, if necessary, is optional as long as problems such as releasability and discoloration of the release paper do not occur.

The method for producing a recording material according to the present invention will be described. First, in FIG. 2A, an ink receiving layer material containing inorganic particles and the above binder is mixed with a release film and a release film. Releasable carrier such as paper pattern or release belt
(5) An ink receiving layer film (2) is formed by means of coating on the surface.

At this time, the coating composition obtained by dissolving or dispersing the ink receiving layer material in a solvent capable of dissolving or dispersing and diluting the composition to a viscosity suitable for each coating equipment is obtained. After coating, it is preferable to form a film for the ink receiving layer by means of drying and removing the solvent. Coating is
The drying can be performed by a roll coater, a comma coater, or a reverse coater, and drying can be usually performed in a drying furnace attached to the coater, and the temperature condition can be set according to the kind and amount of the solvent.

At present, water-based inks are generally used in the ink jet printer system, and materials capable of receiving the water-based inks do not have high adhesiveness to various plastic materials and metal materials. An untreated PET film, an OPP adhesive film subjected to a corona discharge treatment, a phenolic resin or an alkyd resin, etc. were applied to secure an appropriate peeling force with the release carrier used for forming the film. Paper may be used, or a method of directly applying a coating on a metal belt may be adopted.

The peeling force here means that the peeling force at the time of peeling at 300 mm / min is 1 due to the necessity of handling the releasable carrier on which the ink receiving layer is formed and peeling off the releasable carrier.
４０40 N / m, preferably 1 to 8 N / m
Is preferable. If it is less than 1 N / m, problems such as floating during drying tend to occur, and if it exceeds 40 N / m, it becomes difficult to peel off from release paper, and due to the stress applied to the receiving layer film at the time of peeling, the adhesiveness After lamination with the agent layer, it causes curling and shrinkage.

On the other hand, as shown in FIG. 2B, a pressure-sensitive adhesive composition solution or the like capable of forming a pressure-sensitive adhesive layer in which the light scattering fine particles (7) are dispersed is separately applied to a release film (4). ) Apply on top and dry to form adhesive layer (3). afterwards,
The ink receiving layer film (2) and the release film (4)
The upper pressure-sensitive adhesive layer (3) is laminated, and at this time, the release carrier (5) and the ink receiving layer film (2) are peeled off before or after lamination of both, and the frequency is low. In some cases, the release carrier (5) and the ink receiving layer film (2) may be peeled off during lamination, that is, while laminating.

The above-mentioned "peeling before lamination" refers to a method in which the releasable carrier and the once formed ink receiving layer film are peeled off, and then the receiving layer film is laminated on the pressure-sensitive adhesive layer on the release film. Means Further, peeling after `` lamination '' means that the ink receiving layer film (2) formed on the release carrier (5) is temporarily removed from the release film (4) by the composition for forming an adhesive. It means a method of laminating a release carrier and an ink receiving layer film after laminating on a pressure-sensitive adhesive layer (3) formed by means such as applying and drying an object.

When inorganic particles such as silica and alumina and an inorganic electrolyte are added to the ink receiving layer material, a coating material is coated on a release carrier and dried and dried to obtain the following. There may be a difference in the modification effect due to the difference in the surface concentration of the inorganic particles and the inorganic electrolyte, and it is preferable to set the suitable surface to the product surface. If suitable, peel off before lamination,
It is preferable that the pressure-sensitive adhesive layer is laminated with the pressure-sensitive adhesive layer such that the surface opposite to the release surface is the surface of the recording material for an ink jet printer.

In addition to these methods, when producing the recording material according to the present invention, the composition for forming a pressure-sensitive adhesive is directly applied to a receiving layer provided with a release carrier, followed by drying.
Furthermore, a direct coating method in which the release carrier is peeled off after the release paper is laminated may be adopted.

[0027]

EXAMPLES (Example 1) [Preparation of ink-jet recording material] Silica particles (T32, T32, average particle size of about 1) were added to 100 parts by weight of a polyvinyl acetal resin (acetalization degree: about 9 mol%). (0.5 μm) An ink receiving layer material containing 10 parts by weight of sodium chloride and 1 part by weight of sodium chloride was dispersed in a solvent to obtain a coating agent. Using a baker-type applicator, apply this coating agent on a polyethylene terephthalate (PET) film (Lumirror # 38, manufactured by Toray Industries Co., Ltd.) using a baker-type applicator, The film was dried using a hot air drier to form a film (2) for an ink receiving layer.

On the other hand, a pressure-sensitive adhesive composition in which titanium oxide having the following composition was dispersed was prepared. Acrylic adhesive 100 parts by weight (solvent: ethyl acetate) T-70 glue, Teikoku Chemical Co., solid content concentration 28% by weight, transparent color 100 parts by weight Titanium oxide (manufactured by Dainichi Seika, SZ, average particle size: about 1 μm) 14 parts by weight Ethyl acetate 50 parts by weight Isocyanate crosslinking agent (Coronate L28, manufactured by Nippon Polyurethane Co., Ltd.) 5 parts by weight

Thereafter, this pressure-sensitive adhesive composition is applied to a release polyester film (4) so as to have a thickness of 50 μm after drying, and then dried to obtain a pressure-sensitive adhesive layer having a total light transmittance of 30%. 3) was formed. Next, the above-mentioned film for ink receiving layer (2) was once peeled off from the PET film (5), and the adhesive layer provided on the release polyester film (4) so that the peeled surface became the surface. 3) to obtain a recording material for inkjet.

[Use of Recording Material] The ink-jet recording material obtained as described above was subjected to monochromatic solid printing using cyan, magenta, yellow, and black (CMYK) using an aqueous pigment ink jet printer JV2-130 manufactured by Mimaki. Printed. Next, an over-laminated film (SIL131 manufactured by Sekisui Chemical Co., Ltd .: a film in which a 30-μm-thick acrylic pressure-sensitive adhesive was formed on a 50-μm-thick vinyl chloride resin film) was adhered to the entire surface on which the solid printing was performed. Thereafter, the release polyester film film (4) was peeled off, and an acrylic milk plate (Acrylite, manufactured by Mitsubishi Rayon Co., Ltd., 2 m thick) as an adherend
m).

(Embodiment 2) In the same manner as in Embodiment 1, PE
A film for an ink receiving layer was formed on a T film. On the other hand, a pressure-sensitive adhesive composition having the following composition was prepared.

Acrylic adhesive 100 parts by weight (solvent: ethyl acetate) T-70 glue, Teikoku Chemical Co., solid content concentration 28% by weight, transparent color 100 parts by weight Pearl pigment (Leica, Pearl mica average particle size) : About 6 μm) 14 parts by weight Ethyl acetate 50 parts by weight Isocyanate crosslinking agent (Coronate L28, manufactured by Nippon Polyurethane Co., Ltd.) 5 parts by weight

Thereafter, this pressure-sensitive adhesive composition is applied to a release polyester film (4) so as to have a thickness of 50 μm after drying, and dried to form a pressure-sensitive adhesive layer having a total light transmittance of 30%. After the formation, the above-mentioned film for ink receiving layer (2) was laminated on the pressure-sensitive adhesive layer (3) with the PET film (5) attached to obtain an ink jet recording material.

[Use of Recording Material] After the PET film (5) of the ink jet recording material obtained as described above was peeled off, CMYK single-color solid printing was performed in the same manner as in Example 1, and the entire surface thereof was printed. The same over-laminated film as in Example 1 was laminated. Further, as an adherend, an acrylic half plate (manufactured by Mitsubishi Rayon Co., Ltd., Acrylite, 2 m thick)
m).

(Comparative Example 1) A structure in which a receiving layer material is laminated on a vinyl chloride resin film, and an adhesive surface of an adhesive layer containing light-scattering fine particles and having release paper is laminated on the opposite surface. A commercially available ink jet recording material (PVCG manufactured by Sakurai) having the following properties was used. The pressure-sensitive adhesive layer had a total light transmittance of 55%. [Use of recording material] In the above-mentioned ink jet recording material,
In the same manner as in Example 1, an image was printed by an inkjet printer method, an over-laminated film was stuck thereon, the release paper of the recording material was peeled off, and an acrylic milk half plate as a white plate was used. Pasting work was performed.

Comparative Example 2 A pressure-sensitive adhesive composition having the following composition and containing no light-scattering fine particles was prepared. Acrylic adhesive 100 parts by weight (solvent: ethyl acetate) T-70 glue, Teikoku Chemical Co., Ltd., solid content concentration 28% by weight, transparent color 100 parts by weight Isocyanate cross-linking agent (Nihon Polyurethane Co., Coronate L28) 5 parts by weight

An adhesive having a total light transmittance of 55% was obtained in the same manner as in Example 1 except that a film for an ink receiving layer was formed in the same manner as in Example 1, and that the above-mentioned adhesive composition was used. A layer was formed to obtain an ink jet recording material, which was printed, laminated with an over-laminated film, and applied to an acrylic half plate.

[Evaluation] The total light transmittance of the pressure-sensitive adhesive layer in the ink jet recording materials obtained in Examples 1 and 2 and Comparative Example 2, and the ink jet recording materials obtained in Examples 1 and 2 and Comparative Example 2. Was evaluated by the following method. (Total light transmittance) Measured in accordance with JIS K7105 “Testing method for optical properties of plastics”.

(Coloring properties) Examples 1 and 2 and Comparative Example 1
Obtained under exactly the same conditions as above, using a color measuring machine manufactured by Minolta Co. Then, the transmitted color was measured (light source F6: light source was arranged on the pressure-sensitive adhesive layer side). The printing was performed under the condition of the highest density (the maximum number of dots). The results are shown in FIGS. 3 (C) and (M) and FIGS. 4 (Y) and (K).

Although the same decorative effect was obtained in both Examples 1 and 2 and Comparative Example 1, the recording material used in Examples 1 and 2 was obtained from the vinyl chloride resin film required in Comparative Example 1. Since conventional base materials are not used, the cost of the base material itself is reduced and the number of steps in the lamination manufacturing process is reduced.
It can be manufactured at low cost and can sufficiently exhibit the required functions without using a base material.

In Examples 1 and 2 and Comparative Example 2,
The coloring properties of Examples 1 and 2 were much better than Comparative Example 2. That is, as shown in FIG. 3 (C), in the ink jet recording material on which the cyan printing was performed, the light transmission in the target color developing region (blue wavelength: about 450 to 480 nm) was obtained in Comparative Example 2. And 2, which is extremely high from the viewpoint of the observer of the printed surface.

This point is the same for other magenta and yellow colors. Since a considerable amount of light is transmitted straight through CMY single color, the color is light and any combination of these primary colors can be used for printing. Also, it is impossible to express a dark color with the color development as in the first and second embodiments. When taking an absorption curve as in the example, in order to obtain the color development of the comparative example 2,
It is possible to reduce the printing rate (the number of dots), and as a comparison of transmitted colors, it is better to obtain a color density with a certain width by changing the color density in solid color solid printing. I can say.

In the magenta and yellow colors of Comparative Example 2, light of a light source wavelength other than the intended color region (for example, yellow wavelength: about 570 to 600 nm) is transmitted, and no sharp color is formed. You can see that. Further, in the black color of Comparative Example 2, as shown in FIG.
Even in solid color printing, it tends to transmit to the longer wavelength side in the visible light region, and it is clear that black is not only true black but can only be expressed in reddish gray.

[0044]

The recording material for an ink jet printer according to the present invention, which is constituted as described above, is used for pasting work and is essential for the conventional recording material in order to secure the strength and the color developing function of white. This reduces the number of base layers of the ink-receiving layer, and provides a practically useful effect that it can be provided at low cost. Further, since the adhesive layer having a total light transmittance of 10 to 40% formed by dispersing light scattering fine particles is provided, when used for an internal illumination type application, a light diffusion function is exhibited. It is excellent in the coloring property of the coloring agent by transmitted light, exhibits a sufficient decorative effect, and can exhibit good coloring property even in the case of an ink jet system using a pigment as the coloring agent. In addition, since the method for producing a recording material for an ink jet printer according to the present invention is configured as described above, the recording material of the present invention can be provided relatively easily.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view illustrating an example of a recording material for an ink jet printer of the present invention.

FIG. 2 is a view for explaining a method for producing a recording material for an ink jet printer of the present invention, wherein (a) shows an ink receiving layer film formed on a release carrier,
(B) shows the pressure-sensitive adhesive layer formed on the release film.

FIG. 3 is a diagram showing the color developing properties of the recording materials for an ink jet printer obtained in Examples 1 and 2 of the present invention and Comparative Example 2, wherein (C) shows cyan printing and (M) shows magenta printing. Each is represented.

FIG. 4 is a diagram showing the color developing properties of the recording materials for an ink jet printer obtained in Examples 1 and 2 of the present invention and Comparative Example 2, wherein (Y) shows yellow printing and (K) shows black printing. Each is represented.

FIG. 5 is a sectional view showing an example of a conventional recording material for an ink jet printer.

[Explanation of symbols]

 2 ... Ink receiving layer film 3 ... Adhesive layer 4 ... Releasable film 5 ... Releasable carrier 7 ... Light scattering fine particles

Claims (2)

[Claims] 1. An inorganic layer and an oil-absorbing or water-absorbing binder are coated on a pressure-sensitive adhesive layer having a total light transmittance of 10 to 40%, in which light scattering fine particles laminated on a release film are dispersed. A recording material for an ink jet printer, comprising a laminated ink receiving layer film. 2. An ink-receiving layer film containing inorganic particles and an oil-absorbing or water-absorbing binder is formed on a release carrier, and then light is applied onto the ink-receiving layer film and the release film. A pressure-sensitive adhesive composition in which scattering fine particles are dispersed is coated and dried, and a light-transmitting pressure-sensitive adhesive layer having a total light transmittance of 10 to 40% is laminated thereon. 2. The method for producing a recording material for an ink jet printer according to claim 1, wherein the releasable carrier and the ink receiving layer film are peeled off before, during or after lamination.