JP2002200843A - Recording material for ink jet printer and manufacturing method therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a low-cost recording material for an ink jet printer which shows curve surface follow-up characteristics, the applicability of the co-called working method using water application as well as a manufacturing method for the recording material for an ink jet printer. SOLUTION: This recording material for an ink jet printer has a release film (1), a pressure-sensitive adhesive layer (2), a thin layer film (3) with a thickness of 3-25 μm composed of a thermoplastic resin and an ink receiving film (4) containing an inorganic particle and an oil-absorbing or a water- absorbing integrating agent, laminated in that order. The manufacturing method for the recording material comprises the steps to form the ink recording layer film (4) containing the inorganic particle and the oil-absorbing or water- absorbing integrating agent on a mold release carrier and laminate the laminated film (3) obtained by laminating the ink receiving layer film (4) and the thin layer film (3) with a thickness of 3-25 μm composed of a thermoplastic resin, on the adhesive layer (2) formed on the mold release film (1).

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 used for sticking and a method for producing the same.

[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, it is rapidly spreading as a system that can print a large image in a short time and at low cost. Conventionally,
Generally, as shown in FIG. 3, a recording paper for an ink jet printer is formed by applying a liquid in which a material for forming an ink receiving layer is dissolved or dispersed on a paper or a film serving as a base material 3 ′, and then drying and drying the ink receiving layer. 4 (see, for example, JP-A-63-151476).

[0003] When this recording paper is used for decoration or display purposes, in order to adhere the base material 3 'to the adherend,
The pressure-sensitive adhesive layer 2 with the release paper 1 was previously laminated or fixed to the adherend later with an adhesive or a double-sided tape. Furthermore, when displaying the image obtained by the inkjet printing method outdoors or when holding it for a long period of time, in order to ensure the abrasion resistance, water resistance, weather resistance, etc. of the receiving layer, the surface of the receiving layer after printing is applied. It has been practiced to laminate an over-laminated film provided with a resin base film or to provide a top coat layer made of a clear paint.

On the other hand, in an ink-jet printing system in which a coloring agent such as a multicolored ink is printed on recording paper by printing, a white coloring ink is not particularly used. In addition to the function of reinforcing the strength of the receiving layer that has absorbed water, etc., it also has a white color developing function of securing the color saturation of the ink by being white as the base material of the spotted ink. I was carrying it.

However, in recent years, inexpensive, lightweight, and easy-to-handle decorative boards such as aluminum composite boards have become widespread. If such boards are used, a very uniform painted white surface can be obtained. At present, the white coloring function of the base material 3 'in the recording material is no longer necessary when used for applications premised on sticking work.

The type of the base material 3 'is, for example, a film, cloth, canvas made of a thermoplastic resin such as polyethylene terephthalate (PET), polyethylene (PE), polypropylene (PP), polyvinyl chloride (PVC) and the like. Such as knitting, tent ground impregnated with PVC resin, etc., the material and form are various, and when manufacturing and using the recording material, it is necessary to prepare all of them from the viewpoint of industrial production, There were inconveniences from the viewpoint of the user.

When a white color forming function is required for the base material layer, a base material having a size of 50 μm or more is generally required from the viewpoint of securing the color formation as the base material layer and the strength.
When a substrate having a high modulus of elasticity such as T is used, there is a problem that the ability to follow a curved surface is low and the use of the obtained recording material is limited.

[0008]

SUMMARY OF THE INVENTION The inventor of the present invention removed such a base material layer, which was indispensable for securing the strength and the color-forming function of white color, but became less necessary, and was able to obtain an inexpensive recording medium. In order to provide the material, a patent application was previously filed for a recording material for an ink jet printer without a so-called base material layer. Was obtained.

That is, when the printed recording material is attached to a delicate position of, for example, an aluminum composite plate, the surface of the aluminum composite plate is wetted with water, the recording material is placed, and the position is confirmed. The adhesive is completely adhered by pressing (water application method). However, at this time, moisture is impregnated from the pressure-sensitive adhesive layer side to reduce the cohesive force of the ink-receiving layer film and to remove the ink-receiving layer at the time of repositioning. There is a problem that cohesive failure occurs, or the adhesive layer and the ink receiving layer film are separated from each other at the time of re-positioning when the adhesion between the pressure-sensitive adhesive layer and the ink-receiving layer film is reduced and the re-positioning cannot be performed satisfactorily.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned conventional problems of the recording material for an ink jet printer, and the problems of the above-mentioned invention which have been already proposed. An object of the present invention is to provide an inexpensive recording material for an ink jet printer to which an execution method can be applied and a method for manufacturing the same.

[0011]

SUMMARY OF THE INVENTION In order to achieve the above objects, the present invention provides a release film, an adhesive laminate, a thin film having a thickness of 3 to 25 .mu.m comprising a thermoplastic resin, inorganic particles and an oil absorbing property. Alternatively, a recording material for an ink jet printer in which an ink receiving layer film containing a water absorbing binder is laminated in this order, and an ink receiving layer containing inorganic particles and an oil absorbing or water absorbing binder After the film is formed on the release carrier, a laminated film obtained by laminating an ink receiving layer film and a thin film having a thickness of 3 to 25 μm made of a thermoplastic resin is formed on the release film. To provide a method for producing a recording material for an ink-jet printer to be laminated on a pressure-sensitive adhesive laminate.

As shown in FIG. 1, a recording material for an ink jet printer according to the present invention comprises a release film 1, an adhesive layer 2, and a thin film 3 of 3 to 25 μm in thickness made of a thermoplastic resin. A plastic thin film), and an ink receiving layer film 4 containing inorganic particles and an oil-absorbing or water-absorbing binder.

As the release film 1, a known film can be used as long as it has a release property. For example, a film made of a thermoplastic resin such as polyester or polyolefin represented by polyethylene terephthalate, or Examples include a film in which paper is coated with a release agent made of silicone or a polyolefin wax. The thickness of the release film is not particularly limited, but is usually 50 to 200.
The thickness is preferably about 100 μm, and it is preferable to have a certain thickness in consideration of the sticking work.

The pressure-sensitive adhesive constituting the pressure-sensitive adhesive layer 2 formed and laminated on the release film 1 is not particularly limited, and conventionally known pressure-sensitive adhesives can be used, such as natural rubber, synthetic rubber, and acrylic resin. And those containing a silicone resin as a main component. Also, if a white colorant such as titanium oxide is added to the pressure-sensitive adhesive layer, it is possible to secure color development by ink-jet printing even if the color of the adherend to be bonded is not white, so that the performance of the pressure-sensitive adhesive is reduced. A pigment may be added within a range that does not impair, and when exposure to ultraviolet rays or the like is expected from the adhesive layer, an ultraviolet absorber is added within a range that does not impair the adhesive performance of the adhesive for the purpose of improving light resistance. May be. Although the thickness of the pressure-sensitive adhesive is not particularly limited, it is usually 20 to 5
It is about 0 μm.

The material of the thin film 3 of 3 to 25 μm made of a thermoplastic resin formed and laminated on the pressure-sensitive adhesive layer 2 is not particularly limited as long as it has the water resistance of a general-purpose thermoplastic resin. However, examples thereof include thermoplastic resins such as polyethylene terephthalate (PET), polyethylene (PE), polypropylene (PP), and polyvinyl chloride (PVC).

The function of the thin film layer is not to function as a base material of the ink receiving layer film but to function as a seal layer between the receiving layer film and the adhesive.
A thinner thickness is advantageous in terms of material cost, but requires a thickness of 3 μm or more from the viewpoint of strength, and 25
μm or less is required.

The ink receiving layer film 4 formed and laminated on the thin film 3 contains inorganic particles and an oil-absorbing or water-absorbing binder. The inorganic particles only need to have absorptivity to the ink to be used, and examples thereof include porous materials such as silica, alumina, and zeolite, which generally have a particle diameter of several microns or less. 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. As the adhesive, for example, polyvinyl alcohol,
Examples include hydrophilic materials such as 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, they may be appropriately added together with the inorganic particles according to the required printing performance and the like. A thick ink receiving layer film can be formed. As the inorganic particles, a binder 1
About 5 to 200 parts by weight is blended with respect to 000 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. In the present invention, the ink receiving layer may optionally contain various additives such as a heat stabilizer, an antioxidant, an inorganic electrolyte, and a coloring agent, if necessary, as long as no problem occurs. it can.

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. The ink receiving layer film 4 is formed by means such as coating on a release carrier 5 such as a pattern paper or a release belt. At this time, the ink receiving layer material is dissolved or dispersed in a solvent that can be dissolved or dispersed,
It is preferable to form a film for an ink-receiving layer by applying a coating composition obtained by diluting the coating composition to a viscosity suitable for each coating equipment on a release carrier, and then drying and removing the solvent.

The coating can be performed by a roll coater, a comma coater, or a reverse coater, and the drying can be performed in a drying furnace usually provided with the coater, in accordance with the type and amount of the solvent, and the temperature conditions can be set.

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

Next, the ink receiving layer film 4 and the thermoplastic thin film 3 are laminated, preferably by a dry lamination method. However, at the stage of forming the receiving layer film 4, instead of the release film 1, an adhesive component is applied in advance to the thermoplastic thin film 3 to be used, and directly
A method of applying and drying the receiving layer film may be adopted.

However, in general, an aqueous solvent is used as a compounding material for the aqueous inkjet receiving layer, and its solid content is as low as about 10 to 30% by weight. When these coating liquids are coated and dried on a thermoplastic thin film, the volume shrinkage rate is large due to the solid content of the coating agent, and the coating liquid has internal stress at the time of coating and drying, resulting in curling. As a cause or a high temperature and a long time are required as a drying condition, a dry laminating method is preferred as described below, rather than directly applying and drying the coating liquid.

That is, after an adhesive is applied (not shown) to the thermoplastic thin film 3 in FIG. 2B if necessary, the receiving layer film 4 shown in FIG. 5 and laminated and laminated to form a laminated film 6.

At this time, when inorganic particles such as silica and alumina and an inorganic electrolyte are added to the ink receiving layer material, a receiving layer film obtained by applying a coating agent on a release carrier and drying it is obtained. On the front and back, 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, it is preferable to make the suitable surface the product surface, so in the method for producing a recording material of the present invention, The receiving layer film 4 once peeled off from the release carrier is laminated with the thin thermoplastic film 3 so that the surface opposite to the release surface is the surface of the recording material for an ink jet printer.

In addition, since the ink receiving layer material using an aqueous solvent generally has poor wettability, high surface tension and material selectivity, depending on the material of the laminated thermoplastic thin film, corona-modified material may be used. In some cases, coating cannot be performed satisfactorily, for example, due to the surface repelling phenomenon such as a phenomenon of repelling a coating liquid. Therefore, in this case, the formulation of the receiving layer material according to the material of the thermoplastic thin film, such as adding a surfactant or the like to the coating liquid composed of the ink receiving layer material to reduce the surface tension thereof, is examined. There is a need. In the case of post-applying, it is preferable to select an appropriate adhesive having sufficient strength since there is no need to consider the adaptability of the coating liquid to the thermoplastic thin film.

The releasable carrier 5 such as a stripping paper used for forming the ink receiving layer film may be used repeatedly after the ink receiving layer film is peeled off.

On the other hand, as shown in FIG. 2C, a solution of a pressure-sensitive adhesive component capable of forming a pressure-sensitive adhesive layer is separately applied to the release film 1 and dried to form the pressure-sensitive adhesive layer 2. Keep it. After that, the thermoplastic thin film 3 side of the laminated film 6 and the pressure-sensitive adhesive layer 2 side of the release film 1 are laminated. At this time, the thermoplastic thin film and the ink receiving layer film are laminated. Either step before or after lamination may be adopted.

That is, when the thermoplastic thin film is made of a material having a high temperature sensitivity such as a vinyl chloride resin, when the film is easily distorted by heating at the time of lamination with the ink receiving layer film or at the time of applying and drying the adhesive, After laminating the thermoplastic thin film and the pressure-sensitive adhesive layer, the release film, it may be laminated with the ink receiving layer film by dry lamination method, or, as in PET, into a thin film. In the case of a film having a relatively high elasticity, the adhesive layer and the release film may be laminated after the thin film film and the ink receiving layer film are bonded together first.

[0031]

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) 10 parts by weight of the ink-receiving layer material mixed with 1 part by weight of sodium chloride was dispersed in a solvent to obtain a coating material. Using a baker-type applicator, apply this coating material on a polyethylene terephthalate (PET) film (Lumirror # 75, manufactured by Toray Industries Co., Ltd.) using a baker-type applicator so as to have a thickness of 20 μm. It dried using the hot-air dryer, and formed the film for ink receiving layers.

Then, a PET film (F, manufactured by Toray Industries, Inc.)
5, a thickness of 5 μm), a urethane-based adhesive for dry lamimut (Takeda Pharmaceutical Co., Ltd., Takelac A520, solid content of 5)
0% by weight) and a curing agent (Takeda A4, Takenate A4)
0, solid content of 75% by weight) and a coating obtained by mixing at a wet coating amount of 4 g / m ² and then drying the ink receiving layer film. The laminate was peeled off from the carrier, and the peeled surfaces were stuck together to form a laminate of a PET film as a thermoplastic thin film and an ink receiving layer film.

On the other hand, an acrylic pressure-sensitive adhesive (T-70 glue, manufactured by Teikoku Chemical Co., Ltd., solid content concentration 28) was placed on a PET film (silicone coating, thickness 50 μm) as a release film.
100% by weight of a transparent color) and 5 parts by weight of an isocyanate cross-linking agent (Coronate L28, manufactured by Nippon Polyurethane Co., Ltd.). The composition was dried and coated to a thickness of 30 μm. Thus, an adhesive layer was formed.

Thereafter, the above-described ink-receiving layer film with PET was laminated on the pressure-sensitive adhesive layer to obtain a desired recording material for an ink jet printer.

(Comparative Example 1) [Ink-jet recording material] Silica particles (T32, T1.5, average particle size: about 1.5 μm) per 100 parts by weight of polyvinyl acetal resin (acetalization degree: about 9 mol%) 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 material.

Using a baker type applicator, white polyethylene terephthalate (PE) kneaded with titanium oxide so that the thickness of the coating material after drying becomes 20 μm.
T) It was applied on a film (Lumirror E100, manufactured by Toray Industries, Inc., corona treated, 100 μm thick), and dried using a hot air drier to form a film for an ink receiving layer.

On the other hand, an acrylic adhesive (manufactured by Teikoku Chemical Co., Ltd.,
A composition obtained by adding and mixing 100 parts by weight of T-70 glue, solid content concentration of 28% by weight, solvent ethyl acetate, transparent color) and 5 parts by weight of an isocyanate cross-linking agent (Coronate L28, manufactured by Nippon Polyurethane Co., Ltd.) is dried and has a thickness of Coating and drying were performed to a thickness of 30 μm to form an adhesive layer.

Thereafter, the above-mentioned laminate of PET and the ink receiving layer film was laminated on an adhesive layer to obtain a recording material for an ink jet printer.

(Comparative Example 2) [Ink-jet recording material] Silica particles (manufactured by Tokuyama Corporation, T32, average particle size: about 1.5 μm) per 100 parts by weight of polyvinyl acetal resin (acetalization degree: about 9 mol%) 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 material.

Using a baker-type applicator, polyethylene terephthalate (PET) was used as a release carrier so that the thickness of the coating material after drying was 20 μm.
The film was applied on a film (Lumirror # 75, manufactured by Toray Industries, Inc.) and dried using a hot air drier to form a film for an ink receiving layer.

On the other hand, an acrylic adhesive (manufactured by Teikoku Chemical Co., Ltd.,
A composition obtained by adding and mixing 100 parts by weight of T-70 glue, solid content concentration of 28% by weight, solvent ethyl acetate, transparent color) and 5 parts by weight of an isocyanate cross-linking agent (Coronate L28, manufactured by Nippon Polyurethane Co., Ltd.) is dried and has a thickness of Coating and drying were performed to a thickness of 30 μm to form an adhesive layer.

Thereafter, the ink receiving layer film obtained above was once peeled off from the PET film, and the peeled surface and the pressure-sensitive adhesive layer were adhered to obtain a recording material for an ink jet printer having no substrate at all. Was.

[Evaluation] The recording materials for ink jet printers produced in the above Examples and Comparative Examples were evaluated by the following methods.

Evaluation of coloring property Water-based pigment ink jet printer JV2- manufactured by Mimaki
At 130, a digital image conforming to the JIS standard is printed on each recording material for an ink jet printer, and an over-laminated film (SIL131 manufactured by Sekisui Chemical Co., Ltd .: 50 μm thick vinyl chloride resin film + 30 μm thick (A laminated film of an acrylic pressure-sensitive adhesive). Further, as the adherend, an aluminum composite plate which is a white plate (manufactured by Tsutsunaka Plastics Co., Ltd., aluminum composite plate: Delanium White, DLF-401WM)
, The release paper of the recording material was peeled off, and a sticking work was performed to perform outdoor decoration.

Evaluation of Workability (Curved Surface Workability) An image was printed on each recording material for an ink jet printer in the same manner as in the evaluation of the color developability, and an overlaminated film was laminated thereon. At that time, for the evaluation of workability on curved surfaces, the entire concave surface of the clock-shaped dish was
It was pasted while being stretched, and it was visually confirmed whether or not floating occurred on the surface of the watch glass.

Evaluation of Workability (Water Adhesion Workability) In the same manner as in the evaluation of the color developability described above, an image was printed on each recording material for an ink jet printer, and an overlaminated film was laminated thereon. Further, as an adherend, an aluminum composite plate (manufactured by Tsutsunaka Plastics Co., Ltd., aluminum composite plate: Delanium White, DLF)
-401 WM), the surface of the aluminum composite plate was sprayed with water by spraying and wetted, and then bonded together. One hour later,
For re-attachment, the recording material for an ink jet printer was once peeled off from the aluminum composite plate and re-attached.

[Evaluation Results] Regarding the coloring properties, no difference was observed between the examples and the comparative examples, and the same decorative effect was exhibited. Regarding the curved surface workability, no lifting occurred in the case of Example and Comparative Example 2, but lifting occurred in the case of Comparative Example 1. Regarding the water-sticking workability, the embodiment and the comparative example 1 could be implemented without any problem.
In Comparative Example 2, when the recording material was peeled off in order to perform the re-attachment operation after spraying the water, the ink receiving layer film caused cohesive failure, and the re-attachment operation could not be performed in practice. This is considered to be due to the fact that the water impregnated from the pressure-sensitive adhesive layer to the ink receiving layer and reduced the cohesive force of the receiving layer film made of a hydrophilic resin.

As described above, in Example 1, the color development was about the same as in Comparative Examples 1 and 2. However, from the viewpoint of reinforcing the strength of the ink receiving layer and ensuring white color development, the thickness of the base layer was 100 μm. Compared to Comparative Example 1 using PET, there is a great practical advantage that the curved surface workability is excellent and the material cost is low. In addition, as compared with Comparative Example 2 having no base material layer, Example 1 is of course disadvantageous in terms of material cost, but in Comparative Example 2, water application work cannot be adopted, and in general, the printer size is reduced. In the case of an image that exceeds, it is necessary to divide the image on the computer so that it fits in the printer size and output it, then glue multiple images and paste it so that the seam image fits, such a delicate position adjustment In view of the fact that it is very important to ensure water-sticking workability in order to perform the recording, it can be said that the recording material of Example 1 is more excellent overall.

[0049]

The recording material for an ink jet printer according to the present invention is constituted as described above, and is essential for securing the strength and the color-forming function of white in the conventional recording material used for pasting. Because the base layer of the ink receiving layer has been thinned, the drawing properties and
It is excellent in workability, and the water barrier function enables application of the water-filled construction method, so it is easy to finely adjust the position, especially when outputting large images, and it is excellent in workability and material This has a practically important effect that it is excellent in cost and can be provided at low cost. Further, since the method for producing a recording material for an ink jet printer according to the present invention is configured as described above, relatively easily,
The recording material of the present invention can be provided.

[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 a laminated film in which a receiving layer film is formed on a thermoplastic thin film, and (c) shows an adhesive laminate formed on a release film.

FIG. 3 is a cross-sectional view illustrating an example of a conventional recording material for an inkjet printer (Comparative Example 1).

FIG. 4 is a cross-sectional view showing another example (Comparative Example 2) of a recording material for an inkjet printer.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Release film 2 ... Adhesive layer 3 ... Thin film 4 ... Ink receiving layer film 5 ... Release carrier 6 ... Laminated film

Claims (2)

[Claims] 1. A release film, a pressure-sensitive adhesive laminate, a thin film having a thickness of 3 to 25 μm comprising a thermoplastic resin, and an ink receiving layer film containing inorganic particles and an oil-absorbing or water-absorbing binder. A recording material for an ink jet printer, which is laminated in this order. 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 the ink-receiving layer film and a thermoplastic resin having a thickness of 3 to 3 are formed. A method for producing a recording material for an ink jet printer, comprising: laminating a laminated film obtained by laminating a thin film having a thickness of 25 μm on an adhesive lamination formed on a release film.