JP2003080856A - Method for protecting ink jet image - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for protecting an ink jet image by which an excellent suitability for shape is exhibited when a film for protecting an image is bonded to the surface of an adherend having a curved surface or irregularities and superb weatherability is ensured. SOLUTION: In the method for protecting an ink jet image by which a film for protecting an image is attached to a material to be ink jet-recorded through a pressure-sensitive adhesive layer after ink jet-recording, the material is composed of a support which is an at least two-layered laminate structure of a non-stretched thermoplastic resin film and an ink receiving layer formed on the support. Further, the film for protecting an image is of such a structure that the pressure-sensitive adhesive layer is formed on a polyolefin base. The non-stretched thermoplastic resin film is preferably a polyethylene resin film. In addition, the film for protecting an image is preferably a polyethylene film. Besides, the film for protecting an image preferably contains an ultraviolet inhibitor.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for protecting an inkjet image, and more specifically, it has excellent shape adaptability even when a recording material recorded by inkjet recording is adhered to a surface having a curved surface or unevenness. And a method for protecting an inkjet image having excellent weather resistance.

[0002]

2. Description of the Related Art An ink jet recording system is one in which minute droplets of ink are ejected by various operating principles to adhere to a recording material such as paper to record images, characters, etc., but at high speed and low speed. It has features such as noise, easy multicoloring, great flexibility in recording patterns, and no need for development-fixing. It has rapidly spread in various applications as a recording device for various figures and color images including Chinese characters. ing. Further, an image formed by a multicolor ink jet system can obtain a recording comparable to that of multicolor printing by a plate making system or printing by a color photographic system. In addition, in applications requiring a small number of copies, it is being widely applied to the field of full-color image recording because it is cheaper than the photographic technique.

In general, such an ink jet recording system has advantages that an image can be obtained by a relatively simple device, maintenance is easy, noise is not generated, and the like, and a recording recorder for measurement, a facsimile, a printer. Widely used in a wide range of fields such as computer terminals, label printers, ticket vending machines, etc.

Further, with the diversification of uses, it is used for posters and POP arts, or a pressure-sensitive adhesive layer is provided on the back surface to provide a price display label, product display (bar code) label, quality display label, Labels such as weighing labels and advertising labels (stickers) can be easily adhered to a wide range of adherends, and the attachment work is easy. Since it is also possible to add a composite function by laminating with a sheet or the like having offset printing suitability, the application to tickets, commuter tickets, various cards, etc. is spreading. However, the conventional inkjet recording material for such a purpose has a problem that good adhesiveness cannot be obtained when the adherend has a curved surface.

Further, as an ink jet recording material, the ink jet ink absorbency and fixability are also important. That is, high printing speed, low noise, easy multi-coloring, development-
Due to features such as no need for fixing, inkjet printers that have become widespread use inkjet inks that are difficult to dry to avoid clogging of nozzles.The components of this ink are binder, dye, solvent, etc. in water. Melted,
That is, water-based ink is generally used. Therefore, as the recording material, the density of the print dots is high, the color tone is bright and vivid, and the ink does not flow out or bleed when the print dots overlap due to the rapid absorption of the ink, It is required that the diffusion of the print dots in the lateral direction is not unnecessarily large and that the periphery is smooth and the image is not blurred. However, the conventional inkjet recording material for such a purpose has a problem that the coating layer is inferior in water resistance and cannot be used outdoors.

[0006]

SUMMARY OF THE INVENTION An object of the present invention is to provide a method for protecting an inkjet image, which has excellent shape adaptability even when adhered to an adherend surface having a curved surface or unevenness and is excellent in weather resistance. Is to provide.

[0007]

[Means for Solving the Problems] In other words, in an inkjet image protection method of applying an image protection film via an adhesive layer after inkjet recording on an inkjet recording material, the inkjet recording material is a non-stretched thermoplastic resin. An image protection method in which an ink receiving layer is provided on a support which is a laminated structure of at least two layers of a film, and the image protection film is a film in which the adhesive layer is provided on a polyolefin-based substrate. Is.

The unstretched thermoplastic resin film is preferably a polyethylene resin film.

The image-protecting film is preferably a polyethylene film, and more preferably contains an ultraviolet protective agent.

In an ink-jet image protection method in which an ink-jet recording material is ink-jet recorded on an ink-jet recording material and then an image protection film is attached via an adhesive layer, the ink-jet recording material is at least a non-stretched thermoplastic resin film. An ink-receiving layer is provided on a support having a laminated structure of two or more layers, and an adhesive layer is provided on the opposite side of the ink-receiving layer, and the image-protecting film is adhered to a polyolefin-based substrate. It is an inkjet image protection method which is a film provided with an agent layer.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION The support used in the ink jet recording material of the present invention is a laminated structure of at least two layers of a thermoplastic resin film formed by a non-stretching film forming method.
Examples of the thermoplastic resin of the thermoplastic resin film include various resins such as polyolefin, polystyrene, polyvinyl acetate, polyacrylate, polymethacrylate, polyvinyl chloride, polyvinylidene chloride, polycarbonate, polyester and polyamide. As the polyolefin resin, low density polyethylene (LDPE), linear low density polyethylene (L-LDPE), high density polyethylene (HDPE), polypropylene (PP), polybutene,
Homopolymers of olefins such as polypentene or copolymers of two or more olefins such as ethylene-propylene copolymers and mixtures thereof. As the polyester resin, polyethylene terephthalate,
Examples thereof include polybutylene terephthalate and polyethylene naphthalate. Among them, polyolefin resins such as polyethylene and polypropylene are preferable in terms of solvent resistance,
Polyethylene resin is more preferable in terms of shape adaptability and support adaptability.

As a method for forming these thermoplastic resins into a film having a laminated structure of two or more layers, a method for producing a laminated film can be usually used. That is, a method of extruding and laminating a hot-melt resin on a single-layer film, a method of adhering two single-layer films via a molten resin layer, and a two-layer or three-layer laminated film directly by a co-extrusion device. There are a method of making and a method of adhering single-layer films to each other with an adhesive. In the present invention, it is preferably a laminated film without an adhesive or the like, that is, a laminated film obtained by directly forming a molten resin into a laminated film, coating the surface with a molten resin, or laminating with a molten resin.

The technique for producing a two-layer or three-layer laminated film is a technique widely and widely used.
This is because when various functions cannot be solved by a single plastic film, a method of solving the problem by using a multilayer structure is adopted. That is, gas barrier property, heat seal property,
A combination of convenient properties such as transparency, impact resistance and heat resistance can be selected. The support for the recording material in the present invention is required to have shape adaptability, appropriate opacity, and blocking resistance. As a support for inkjet recording material, it must have properties suitable for coating an ink-receiving layer on it, and it must have excellent shape adaptability even when applied to an adherend having a curved surface. is there. A single layer cannot obtain a sheet that sufficiently satisfies these characteristics,
In particular, the sheet of the present invention which can be coated with the ink receiving layer excellent in shape adaptability was obtained by forming a laminated structure of two or more layers.

As the laminated film of two layers or three layers, the film method synthetic paper is one embodiment. However, in the film-type synthetic paper, molten resin is extruded from an extrusion die in a thick film, cooled once, heated again to around the softening temperature, and stretched in the longitudinal and transverse directions simultaneously or sequentially to form a film. It is a thing. This film forming method is called a biaxially stretched film forming method. By stretching, appropriate hardness and strength are obtained. In addition, there are those in which fine voids (microvoids) are generated inside during this stretching, and those in which there are no voids. The synthetic paper disclosed in Japanese Patent Laid-Open No. 62-259848 is a typical example of the paper having this void.
These are widely used, for example, under the trade name of "Yupo". On the other hand, extruding molten resin from the die slit,
A method of cooling and solidifying while winding and winding is called an unstretched film molding method. The unstretched film referred to in the present invention is a laminated film which is not stretched in the machine direction or the transverse direction and is a film produced by a non-stretched film molding method. The unstretched film is flexible and easily takes a shape adapted to a curved surface or an uneven surface.

In the thermoplastic resin for film formation, titanium oxide, zinc oxide, talc, calcium carbonate,
Inorganic fillers such as calcined clay, barium sulfate, silica,
Fatty acid amides such as stearic acid amide and arachidic acid amide, zinc stearate, calcium stearate,
Fatty acid metal salts such as aluminum stearate and magnesium stearate, blue pigments and dyes such as cobalt blue, ultramarine blue, cecilian blue and phthalocyanine blue, cobalt violet, fast violet,
Magenta pigments and dyes such as manganese purple, optical brighteners,
It is also possible to add various additives such as an ultraviolet absorber and an antioxidant in an appropriate combination. The inclusion of an inorganic filler, particularly titanium oxide, is preferable because it dramatically improves the opacity.

One of the preferred embodiments of the support in the present invention is that the first layer is a high density polyethylene (HDPE) layer and the second layer is a low density polyethylene (LDPE, L-LDPE) layer from the side where the ink receiving layer is provided. It is the structure of. Further, a support having a three-layer structure having a high-density polyethylene (HDPE) layer as the third layer is also one of the preferable embodiments.
Further, it is a preferred mode to contain an inorganic filler such as titanium oxide or calcium carbonate in the second low-density polyethylene layer in order to obtain opacity. Also, the first layer or the third layer
The inclusion of an inorganic filler such as talc in the HDPE layer of the layer is a preferred embodiment from the viewpoint of blocking prevention and the like.

For the purpose of increasing the acceptability of the ink jet ink, an ink receiving layer is provided on at least one surface of the laminated resin film support used in the present invention. One aspect of providing the ink receiving layer is a method of applying a porous ink absorbing layer containing at least an inorganic pigment and an adhesive.

Examples of the inorganic pigment used in the ink jet ink receiving layer of the present invention include light calcium carbonate, heavy calcium carbonate, magnesium carbonate, magnesium hydroxide kaolin, talc, calcium sulfate,
Barium sulfate, titanium dioxide, zinc oxide, zinc sulfide, zinc carbonate, satin white, aluminum silicate, diatomaceous earth, calcium silicate, magnesium silicate, synthetic amorphous silica (wet precipitation silica, gelation silica, vapor phase silica) Etc.), colloidal silica, alumina, colloidal alumina, pseudo-boehmite, aluminum hydroxide, lithopone,
Inorganic pigments such as zeolite, hydrohalloysite and magnesium hydroxide, organic pigments such as styrene plastic pigments, acrylic plastic pigments, polyethylene, microcapsules, urea resins and melamine resins can be mentioned.

Among the above pigments, the pigment contained as the main component in the ink jet ink receiving layer is preferably a porous inorganic pigment such as porous synthetic amorphous silica, porous calcium carbonate, porous magnesium carbonate, and porous Examples thereof include alumina, and porous synthetic amorphous silica having a large pore volume is particularly preferable.

As such synthetic amorphous silica, commercially available products can be preferably used. For example, Mizukasil P-
526, Mizukasil P-801, Mizukasil NP-8,
Mizukasil P-802, Mizukasil P-802Y, Mizukasil C-212, Mizukasil P-73, Mizukasil P
-78A, Mizukasil P-78F, Mizukasil P-8
7, Mizukasil P-705, Mizukasil P-707, Mizukasil P-707D, Mizukasil P-709, Mizukasil C-402, Mizukasil C-484 (manufactured by Mizusawa Chemical Co., Ltd.), Tokusil U, Tokusil UR, Tokusil G
U, Tokuseal AL-1, Tokuseal GU-N, Tokuseal N, Tokuseal NR, Tokuseal PR, Sorex, Fineseal E-50, Fineseal T-3
2, fine seal X-37, fine seal X-37
B, Fineseal X-70, Fineseal RX-7
0, Fineseal A, Fineseal B (above, Tokuyama Soda), Carplex FPS-101, Carplex CS-7, Carplex 80, Carplex XR, Carplex 67 (above, Shionogi Pharmaceutical), Syloid 72, Syloid 74, Syloid 622, Syloid 244 (all manufactured by Grace Devison), Sylysia 440, Sylysia 470 (all manufactured by Fuji Silysia Chemical Ltd.), and the like.

The adhesive of the ink receiving layer is a water-soluble, water-dispersible or water-insoluble polymer adhesive. For example, water-soluble or water-dispersible polymer adhesives include starch derivatives such as oxidized starch, etherified starch, and phosphoric esterified starch; cellulose derivatives such as carboxymethyl cellulose and hydroxyethyl cellulose; casein, gelatin, soybean protein, Polyvinyl alcohol or its derivatives;
Conjugated diene-based copolymer latex such as polyvinylpyrrolidone, maleic anhydride resin, styrene-butadiene copolymer, methylmethacrylate-butadiene copolymer; acrylic-based polymer such as acrylic acid ester and methacrylic acid ester or copolymer Acrylic polymer latex such as polymer; vinyl polymer latex such as ethylene-vinyl acetate copolymer; or functional group-modified polymer latex with a functional group-containing monomer such as carboxy group of these various polymers; melamine Water-based adhesives such as resins and thermosetting synthetic resins such as urea resins; acrylic acid esters such as polymethylmethacrylate; polymer or copolymer resins of methacrylic acid esters; polyurethane resins, unsaturated polyester resins, vinyl chloride-vinyl acetate Copolymer, polyvinyl butyral, alkyd Synthetic resin adhesives and the like, and the like.

As the water-insoluble polymer adhesive,
For example, an acetal resin such as a vinylpyrrolidone / vinyl acetate copolymer, polyvinyl butyral, or polyvinyl formal can be mentioned. Particularly, the acetal resin having a degree of acetalization of 5 mol% or more and 20 mol% or less contains some water. It is preferable because it is possible to facilitate the dispersion of the inorganic pigment. Further, the water-insoluble polymer adhesive is more preferable in water resistance than the water-soluble polymer adhesive because the water resistance of the coating layer is improved and it can be used in outdoor applications because it can withstand wind and rain. .

These polymer adhesives may be used alone or in combination of two or more, and are 3 to 70 parts by weight, preferably 5 to 50 parts by weight, and less than 3 parts by weight with respect to 100 parts of the inorganic pigment. The coating strength of the ink jet ink receiving layer is insufficient, and if it exceeds 70 parts by weight, the ink jet ink absorbency is lowered.

Further, the ink-jet ink receiving layer contains
As an additive, a dye fixing agent, a pigment dispersant, a thickener, a fluidity improver, an antifoaming agent, a foam suppressor, a release agent, a foaming agent, a penetrating agent,
Coloring dyes, coloring pigments, optical brighteners, ultraviolet absorbers, antioxidants, preservatives, antifungal agents, water resistance agents, wet paper strength enhancers, dry paper strength enhancers and the like can also be appropriately added.

Particularly, secondary amine, tertiary amine, and 4 which form an insoluble salt with the sulfonic acid group, carboxyl group, amino group, etc. in the water-soluble direct dye or water-soluble acid dye, which is the dye component of the water-based inkjet ink. When a cationic dye fixing agent consisting of a high-grade ammonium salt is blended, the dye is captured in the ink receiving layer, so the color is improved and insoluble salts are formed, resulting in ink dripping or bleeding due to water dripping or moisture absorption. Is preferable because it suppresses

In the present invention, if the coating amount of the ink jet ink receiving layer is too small, not only does the ink jet ink absorbency become a problem, but the image density, chromaticity, and sharpness are low, and the ink jet ink is received by the ink jet ink receiving layer. The deterioration of the dot shape called feathering, which is diffused in the plane direction of the layer and is jagged like bird feathers, occurs. Further, if the coating amount is too large, the drying load in the drying step after coating is increased, not only the productivity is reduced due to the reduction in coating speed, but also the inkjet ink receiving layer is constituted by the high-load drying. The adhesive in the coating composition moves to the surface of the inkjet ink receiving layer together with the solvent that evaporates, and reduces the amount of voids on the surface, so that scumming occurs at the time of recording and the curling property deteriorates. Therefore, it is not preferable. From such a viewpoint, the coating amount of the inkjet ink receiving layer is preferably 1 to 30 g / m ² .
It is also possible to apply the ink-jet ink receiving layer at a certain coating amount in several steps, and when imparting gloss, the gloss is improved compared to applying the coating amount at once. To do.

As a method for coating the ink jet ink receiving layer, various coating apparatuses such as various blade coaters, roll coaters, air knife coaters, bar coaters, rod blade coaters, curtain coaters and short dwell coaters can be used. After coating, machine calendar, TG calendar, super calendar,
It is also possible to use a calendering device such as a soft calender for flattening.

When the ink-jet ink-receiving layer is applied, the support may be provided with the ink-receiving layer as it is,
A known surface treatment such as corona treatment, flame treatment, plasma treatment, and ultraviolet irradiation treatment may be applied to the support in advance. Further, in order to improve the adhesiveness, an anchor coat layer may be provided between the film support and the ink receiving layer, which is a preferable embodiment.

In an embodiment having a pressure-sensitive adhesive layer, a known pressure-sensitive adhesive such as an acrylic type, a rubber type, a vinyl ether type, a silicone type or the like is usually applied on a support opposite to the ink receiving layer in a dry film thickness of 10 to 10. It is applied so as to have a thickness of 200 μm. The pressure-sensitive adhesive layer thus formed is laminated with the treated surface of a release sheet previously treated with silicone or the like to give a pressure-sensitive adhesive sheet. As another method for obtaining a pressure-sensitive adhesive sheet, a pressure-sensitive adhesive is applied on a release sheet made of paper or film release-treated with a silicone resin or the like, and this pressure-sensitive adhesive layer is attached to the surface of the support opposite to the ink receiving layer. May be.

The adhesive ink-jet recording material thus prepared can be attached to an adherend by removing the release sheet after ink-jet recording on the ink-receiving layer surface. At this time, in order to prevent the surface pattern and the like of the adherend from penetrating and being invisible, it is a preferred embodiment that the adhesive layer contains a coloring dye or pigment or an inorganic filler. In particular, when a black dye or pigment or titanium oxide is contained in the pressure-sensitive adhesive layer, the opacity is increased and the surface of the adherend becomes difficult to see through, which is a more preferable embodiment.

The image protection film of the present invention is a laminated film in which a transparent polyolefin base material is provided with an adhesive layer. The polyolefin base material is low density polyethylene (LDPE), linear low density polyethylene (L-LD).
Made from homopolymers of olefins such as PE), high density polyethylene (HDPE), polypropylene (PP), polybutene, polypentene or copolymers of two or more olefins such as ethylene-propylene copolymers and mixtures thereof. It is a film. The film is preferably unstretched, and a polyethylene film is particularly preferable.

The image-protecting film of the present invention preferably also contains an ultraviolet protective agent. As a method of incorporating an ultraviolet protective agent into the image protection film, kneading or coating on the surface can be performed. As the anti-ultraviolet agent, all the commercially available anti-ultraviolet agents which are considered to have an anti-ultraviolet effect can be used. However, since an inorganic pigment-based material such as titanium oxide may impair the transparency of the film, an organic ultraviolet protection agent is preferable.

For the pressure-sensitive adhesive layer of the image-protecting film of the present invention, a known pressure-sensitive adhesive such as acrylic, rubber-based, vinyl ether-based, or silicone-based adhesive is usually applied so that the dry film thickness is 1 to 50 μm. Since it is laminated on the image, a transparent adhesive is preferable, and an acrylic adhesive is preferable. There are no particular restrictions on the conditions such as temperature and pressure during lamination, but it is desirable that the temperature is below the temperature at which the polyolefin film is largely deformed by heat.

[0034]

The present invention will be described in more detail with reference to the following examples. The present invention is not limited to these examples. All% and parts shown below are% by mass and parts by mass.

<Preparation of Ink Receptive Layer Coating Liquid 1> Ink receiving layer coating liquid 1 was prepared according to the following composition. Synthetic amorphous silica (Fineseal X-37B: manufactured by Tokuyama Corporation) 10 parts Polyvinyl alcohol (PVA117: manufactured by Kuraray Co., Ltd.) 5 parts Cationic dye fixing agent (SUMIREZ Resin 1001: manufactured by Sumitomo Chemical Co., Ltd.) 2 parts Water 83 parts

Recording Material 1 A resin in which 98 parts by weight of high-density polyethylene resin and 2 parts by weight of talc are mixed as the first layer, and a resin in which 95 parts by weight of low-density polyethylene resin and 5 parts by weight of titanium oxide are mixed as the second layer. The first layer was extruded to a thickness of 15 μm and the second layer was extruded to a thickness of 140 μm using a co-extrusion device, and a support was prepared by a non-stretched film molding method. Corona discharge treatment was applied to the surface of the first layer of the support, and the coating liquid 1 for the ink receiving layer was applied so that the dry solid content was 20 g / m ² to prepare a recording material 1.

<Preparation of Coating Liquid 2 for Inkjet Receiving Layer>
The coating liquid 2 for the ink receiving layer was prepared according to the following composition. Synthetic amorphous silica (Fineseal X-37B: manufactured by Tokuyama Corporation) 30 parts Polyvinyl butyral resin (S-REC BL-S: manufactured by Sekisui Chemical Co., Ltd.) 3 parts iso-propanol 67 parts

Recording Material 2 High-density polyethylene resin as the first layer, co-extrusion device of high-density polyethylene resin as the second layer, resin in which 95 parts by weight of low-density polyethylene resin and 5 parts by weight of titanium oxide are mixed, and high-density polyethylene resin as the third layer. At 15 μm for the first layer and 140 for the second layer
The third layer was extruded to a thickness of 15 μm, and a support was prepared by a non-stretched film molding method. First of this support
On the surface of the layer, the coating liquid 2 for the ink receiving layer is dried to a solid content of 25
A recording material 2 was prepared by coating so as to have g / m ² .

Recording Material 3 The recording material 3 was the same as the recording material 1 except that Yupo FPG # 200 (manufactured by Oji Yuka Synthetic Paper Co., Ltd.) produced by a biaxially stretched film forming method was used as the support. Then, the recording material 3 was prepared.

Recording Material 4 Recording Material 4 was prepared in the same manner as Recording Material 2 except that a single layer white polyester film (thickness 100 μm) was used as the support.

Recording Material 5 An acrylic emulsion pressure-sensitive adhesive layer is applied to the opposite side of the recording material 1 on which the ink receiving layer is provided so as to have a thickness of 10 μm, and a release paper is attached to prepare the recording material 5. did.

Recording Material 6 An acrylic emulsion pressure-sensitive adhesive layer is applied to the opposite surface of the recording material 2 on which the ink receiving layer is provided so as to have a thickness of 10 μm, and a release paper is attached to the recording material 6 to prepare the recording material 6. did.

Recording Material 7 On the opposite surface of the recording material 2 on which the ink receiving layer was provided, an adhesive layer containing 100 parts of acrylic emulsion solid content and 0.1 part of black dye was applied to a thickness of 10 μm. Then, a release paper was attached to produce a recording material 7.

Recording Material 8 On the opposite surface of the recording material 2 provided with the ink receiving layer, a pressure-sensitive adhesive layer containing 100 parts of acrylic emulsion solid content and 5 parts of titanium oxide was applied to a thickness of 10 μm and peeled off. Recording paper 8 was produced by sticking papers together.

Recording Material 9 On the opposite side of the recording material 2 on which the ink receiving layer was provided, an adhesive layer having a solid content of 100 parts of acrylic emulsion, 0.1 part of black dye and 5 parts of titanium oxide was added to a thickness of 10 μm. Then, a recording paper 9 was prepared by applying the above-mentioned composition and a release paper.

Recording Material 10 An acrylic emulsion pressure-sensitive adhesive layer is applied to the opposite side of the recording material 3 on which the ink receiving layer is provided so as to have a thickness of 10 μm, and a release paper is attached to the recording material 10 to prepare the recording material 10. did.

Recording Material 11 An acrylic emulsion pressure-sensitive adhesive layer is applied to the opposite surface of the recording material 4 on which the ink receiving layer is provided so as to have a thickness of 10 μm, and a release paper is attached to prepare the recording material 11. did.

Examples 1 to 7 and Comparative Examples 1 to 4 Using the recording materials shown in Table 1, ink-jet image recording was performed, and then an acrylic adhesive was applied to a polyethylene-based transparent film as an image protection film. Example 1 to 7 and Comparative Examples 1 to 4 were produced by laminating the laminated film (manufactured by Nieei Kako Co., Ltd., pure gloss, substrate film thickness 80 μm).

Comparative Examples 5 to 11 Laminated films obtained by applying an acrylic adhesive to a transparent polyester-based film as an image protection film after ink-jet image recording using the recording materials shown in Table 1. (Nippei Kako Co., Ltd., Pro Touch,
A base film having a thickness of 100 μm) was laminated to prepare Comparative Examples 5 to 11.

Comparative Examples 12 to 18 Comparative Examples 12 to 18 were prepared using the recording materials shown in Table 1 after ink jet image recording without using any image protection film.

<Shape Adaptation Evaluation 1> Fabricated Examples 1 to 1
7 and Comparative Examples 1 to 18 were attached to a spherical adherend having a diameter of 100 mm to evaluate the shape adaptability. Examples 1 and 2
In Comparative Examples 1, 2, 5, 6, 12, and 13, a commercially available adhesive for plastics was applied to the back surface and attached to an adherend.
In addition, Examples 3 to 7 and Comparative Examples 3, 4, 7 to 11, 14
For Nos. 18 to 18, the release paper was peeled off and adhered to the adherend. ○: The sheet is flexible and easy to attach, and wrinkles and peeling do not occur. Δ: The sheet is rather rigid and difficult to attach, but wrinkles do not occur. X: Wrinkles and peeling from the end surface occur.

<Shape Adaptability Evaluation 2> Fabricated Examples 1 to 1
7 and Comparative Examples 1 to 11 were attached to a tile having a star shape having a height of 5 mm and the shape adaptability was evaluated. In addition, in Examples 1 and 2 and Comparative Examples 1, 2, 5, 6, 12, and 13, a commercially available adhesive for plastics was applied to the back surface and attached to an adherend. Moreover, Examples 3-7 and Comparative Examples 3, 4, 7-
For Nos. 11 and 14 to 18, the release paper was peeled off and adhered to the adherend. ◯: The sheet is flexible and is applied neatly along the uneven surface, and no wrinkles occur. X: Wrinkles occur.

<Evaluation of Weather Resistance> The printed sample was attached to the outside of the window glass, and the storage condition of the image was visually evaluated after one month. ○: There is no flow of images or coating layers. X: The image and the coating layer are destroyed.

[0054]

[Table 1]

From Table 1, at least two non-stretched thermoplastic resin films were used as a support for the ink jet recording material.
Using a laminated structure of layers or more, using a polyolefin-based laminate film as an image protection film,
It can be seen that Examples 1 to 7 are excellent in shape adaptability when they are attached to a curved adherend or an uneven surface. Since Comparative Examples 1 to 4 did not use the unstretched thermoplastic resin film as the support, the shape adaptability 1 was poor, and Comparative Examples 5 to 1
Since No. 1 uses a film (polyester film) other than polyolefin as a protective film, the shape adaptability 2 is also poor, and the protective films of Comparative Examples 12 to 18 without the protective film have poor weather resistance.

[0056]

According to the present invention, it is possible to obtain an image protection method for an ink jet recording material which is excellent in shape adaptability when attached to an adherend having a curved surface or unevenness and is also excellent in weather resistance. Become.

Continuation of front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) B41J 3/04 101Y

Claims (5)

[Claims] 1. An inkjet image protection method comprising applying an image protection film via an adhesive layer after inkjet recording on an inkjet recording material, wherein the inkjet recording material is at least two layers of a non-stretched thermoplastic resin film. An ink-jet image protection method characterized in that a support having a laminated structure of (1) above is provided with an ink receiving layer, and the image protection film is a film in which the adhesive layer is provided on a polyolefin base material. . 2. The inkjet image protection method according to claim 1, wherein the unstretched thermoplastic resin film is a polyethylene resin film. 3. The inkjet image protection method according to claim 1, wherein the image protection film is a polyethylene film. 4. The inkjet image protection method according to claim 1, wherein the image protection film contains an ultraviolet protective agent. 5. The ink jet image protection method according to claim 1, wherein the ink jet recording material has an adhesive layer on the side opposite to the ink receiving layer.