JPH07248636A - Manufacture of toner transfer recording image receiving body and high-gloss image receiving body - Google Patents

Abstract

PURPOSE:To obtain a high gloss on the whole printed face after printing by specifying the Tg and coating thickness of the resin used for the toner accepting layer of an image receiving body, and smoothing the surface via the contact with a film having a specific surface roughness. CONSTITUTION:The toner transfer recording image receiving body 10 is constituted of an image receiving body paper made of a base 13, a toner accepting layer 14, and an adhesive layer 15 provided on the face opposite to the toner accepting layer 14 across the base 13, and a separator 12 peelably stuck to the image receiving body paper 11. The separator 12 is made of a separator base 16 and a peel processing layer 17 provided on one face of it, and the peel processing layer 17 is stuck on the adhesive layer 15. The toner accepting layer 14 contains a thermoplastic resin having Tg of 50-80 deg.C, the thickness of the toner accepting layer 14 is set to 4mum or above, and the adhesive strength of the surface of the toner accepting layer 14 is set to 600g/25mm or above when evaluated by a prescribed evaluating method.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a toner transfer recording image receptor such as a label printed by electrostatic transfer of toner. The present invention also relates to a method for imparting a high gloss to the surface of the image receptor having the image formed thereon.

[0002]

2. Description of the Related Art A printer using electrostatic transfer of toner is
It has been widely used not only in the case of PPC for copying an already prepared original document but also in recent years as a printing device for output of information equipment. That is, such a printing apparatus records an electronic output signal from a computer or the like as a latent image on a photosensitive drum with a laser beam or the like, and develops the latent image with toner to form a visible image. In such a printing method, after the toner is transferred to the image receptor by static electricity, fixing is performed by a hot roll or high energy flash.

Paper such as natural paper is usually used for such printing, but in recent years, polyethylene terephthalate (PET) or triacetyl cellulose has been used as a base material for an image receptor.
(TAC) and polypropylene (PP) are also used.
An image receptor using such a base material is superior in transparency as compared with paper and is widely used as an original for an overhead projector (OHP). Further, some of these image receivers have a back surface coated with an adhesive to form a label image receiver. The use of such label receivers is expanding as labels for frozen foods, shelf labels used for display shelves for products, and the like.

Recently, some laser beam printers have a device capable of high-definition printing or color printing exceeding 600 dpi (dot / inch), and various images created by computer graphics are displayed in vivid colors. It is possible to output as an image. In addition, the improvement of the color toner has also improved the transparency and made it possible to make the transmitted image full color. However, the color image formed by such a toner transfer recording method is only used as an OHP document for various presentations such as research presentations and project announcements.

That is, the image formed on the image receiving member by such electrostatic transfer of toner has low surface gloss and is
Poor quality compared to printed materials using ink. For this reason, it is not used for applications that require a glossy and high-quality image surface, such as so-called nameplates that are attached to electrical products, etc. A label on which an image is formed is used.

[0006]

However, in order to form a color image on a label by offset printing,
It is necessary to prepare four plates of yellow, magenta, cyan, and black, which requires a large initial cost in terms of time and cost. In particular, in the case of a nameplate to be attached to a small amount of a wide variety of analytical instruments or custom-made instruments, it becomes very expensive.

An object of the present invention is to provide an image receptor for toner transfer recording which can obtain high gloss over the entire printing surface after printing. Another object of the present invention is to provide a method for imparting high gloss to the image surface of such an image receptor.

[0008]

Means for Solving the Problems The inventors of the present invention have made extensive studies to solve the above problems. As a result, the Tg and the coating thickness of the resin used for the toner receiving layer of the image receptor are set to specific values, and the film is brought into contact with a film having a specific surface roughness to smooth the surface, thereby facilitating printing. The present invention has been completed based on the knowledge that high gloss can be imparted to the entire printing surface afterward.

The present invention is a toner transfer recording image receptor having a base material and a toner receiving layer provided on one surface of the base material, wherein the toner receiving layer contains a thermoplastic resin having a Tg of 50 to 80 ° C. And a toner receiving layer having a thickness of 4 μm or more and an adhesive strength of the surface of the toner receiving layer of 600 g / 25 mm or more when evaluated by a predetermined measuring method described later. It is a thing.

The present invention also provides a label base material, a toner receiving layer provided on one side of the label base material, an adhesive layer provided on the surface of the label base material opposite to the toner receiving layer, and the adhesive. The present invention also provides the above-mentioned toner transfer recording image receptor for a label, which has a separator temporarily attached on the agent layer.

Further, according to the present invention, after forming an image on the above-mentioned toner transfer recording image-receiving body, the image surface is brought into contact with a peeling-treated surface provided on a film having a predetermined characteristic to heat the image-receiving material to obtain a high-gloss image. A method of making a body is provided.

FIG. 1 is a specific example of a toner transfer recording image receptor for a label of the present invention, which has an adhesive layer on the surface of the substrate opposite to the toner receiving layer and a separator temporarily attached on the adhesive layer. It is a schematic cross-sectional view showing.

In FIG. 1, a toner transfer recording image receptor 10 of the present invention comprises a base material 13, a toner receiving layer 14 used on one side of the base material 13, and a surface of the base material opposite to the toner receiving layer. It is composed of an image-receiving sheet 11 made of an adhesive layer 15 provided and a separator 12 releasably attached to the image-receiving sheet 11. The separator 12 is
The separator substrate 16 and the release treatment layer 17 provided on one side thereof, and the release treatment layer 1 on the pressure-sensitive adhesive layer 15.
7 side is pasted. If necessary, a backing layer such as an antistatic treatment layer or a matte treatment layer may be provided on the surface of the separator 12 opposite to the release treatment layer 17.

The substrate used in the image receptor of the present invention is preferably a relatively heat-resistant substrate, such as natural paper, polyethylene terephthalate (PET), polyethylene naphthalate (PEN), and porphenylene sulfide.
(PPS), transparent polyimide (PI), polyetheretherketone (PEEK), polyvinyl chloride (PVC), polystyrene (PSt), polycarbonate (PC), polypropylene (PP) and other heat resistant plastics can be used. Further, a filler such as calcium carbonate or titanium white may be blended with these resins, or those obtained by stretching these resins to make them porous may be used. Further, the substrate surface may be surface-modified by corona discharge treatment, sputtering treatment, sandblast treatment, or the like. Further, it may be a laminate of the above base materials.

The thickness of the substrate is preferably 25 to 200 μm. If the thickness of the base material is thinner than this, it becomes difficult to handle the image-receiving paper, and if it is thicker than this, the entire image-receiving body becomes too thick, which causes troubles when printing with a printer.

The resin used in the toner receiving layer is
Examples thereof include thermoplastic resins such as polyester resins, styrene-acrylic acid ester copolymers, vinyl chloride-vinyl acetate copolymers, vinyl acetate resins, polyamide resins, butyral resins, and ethylene-vinyl acetate copolymers.
The Tg (DSC measurement value) of these resins is 50 to 80 ° C. When the Tg of the resin is lower than this, when the image receptor is held in a high temperature environment, blocking occurs between the sheets, which makes handling difficult. If Tg is higher than this, high gloss cannot be imparted to the image surface.

The thickness of the toner receiving layer needs to be 4 μm or more, preferably 6 to 20 μm. When the thickness of the toner receiving layer is less than 4 μm, when gloss is imparted to the image surface, a gloss difference is likely to occur between the toner transfer portion and the non-transfer portion, and a defect is likely to occur in the gloss of the toner transfer portion.

The toner receiving layer has a surface adhesive strength of 600 g / 25 m when evaluated by the following measuring method.
It must be m or more. If the adhesive strength is less than this, the toner adhesion is insufficient.

Sample Preparation Adhesive Tape Polyester adhesive tape 31B made by Nitto Denko Corporation (base material thickness 25 μm), width 25 mm Adhesion load: 1 reciprocation with a roller having a load of 2 kg.

After sticking, it is left at 25 ° C. for 2 hours.

Measurement: Measurement of tensile strength, strength when peeled at 180 ° at 300 mm / min. Further, the toner receiving layer preferably has a surface resistance of 10 ⁶ to 10 ¹⁴ and is formed on the thermoplastic resin layer. A two-layer structure in which an antistatic treatment layer is applied may be applied, or an antistatic agent may be mixed with the thermoplastic resin layer.

As the pressure-sensitive adhesive used on the side opposite to the toner image-receiving layer side of the substrate, a known acrylic pressure-sensitive adhesive crosslinked with an epoxy-based and / or isocyanate-based crosslinking agent can be used. The thickness of the adhesive layer is 5-4
About 0 μm is preferable. If the pressure-sensitive adhesive layer is thicker than this, the pressure-sensitive adhesive easily protrudes from the edge of the image receptor, and the printer is contaminated.

As the release treatment layer of the separator, in addition to the one using an ultraviolet curing type or thermosetting type silicone resin, a layer coated with a solvent such as a silicone graft acrylic polymer and dried may be used. In this case, it may be crosslinked with isocyanate. The thickness of the release treatment layer is preferably about 0.1 to 1 μm.

Next, in order to impart a high gloss to the surface of such an image receptor, the following treatment is carried out. That is,
A film having at least one surface subjected to a peeling treatment and having a surface roughness (Ra) of 0.05 or less is brought into contact with the printing surface of the image receptor after toner transfer, and temperature and pressure are applied.

FIG. 2 is an explanatory diagram showing a specific example of the method. The film holder 20 includes a mount 21 and a film 22 having one end fused to the mount 21. A peeling treatment layer 23 is provided inside the film 22. The toner transfer recording image receptor 10 after the toner image 24 is formed is sandwiched between the film holders 20 and the temperature is set to 70 to 200 ° C., preferably about 100 to 180 ° C. while bringing the peeling treatment layer 23 and the toner image 24 into contact with each other. Pass through a hot roll.

As the material of the film 22, a material having a surface roughness Ra of not more than 0.05 and smoothness and heat resistance is preferable. If Ra is larger than 0.05, sufficient gloss cannot be obtained. Examples of such a material include polyethylene terephthalate (PET), polyethylene naphthalate (PEN), porphenylene sulfide (PPS),
Polyimide (PI), polyether ether ketone (PE
Heat resistant plastics such as EK) and polycarbonate (PC) can be used.

The thermal shrinkage ε in the machine direction and the transverse direction of this film must be 1% or less in the following test methods.

Sample shape: 20 mm × 100 mm Load: None Pretreatment: Vacuum drying at 25 ° C. (10 ⁻³ Torr or less) for 24 hours Heat treatment temperature: 150 ± 3 ° C. Treatment time: 30 minutes Shrinkage ε: Initial length is L1 When the length of 30 minutes at room temperature after heat treatment is L2, ε = [(L1-L2) / L1] × 100 If the shrinkage ratio of the film used is larger than this, heat treatment is performed in advance to remove residual strain. Can be used. The thickness of the film is preferably 10 to 40 μm. If the thickness of the film is thinner than this, the strength of the film is low and wrinkles may occur when the film is passed through a hot roll. On the other hand, if the thickness is thicker than this, heat from the hot roll is hard to be transmitted, and gloss is hard to be imparted. In addition, a laminate of a metal foil and the above resin film may be used to increase the thermal conductivity and strength. In this case, the thickness of the resin film portion may be set lower than the above range.

In this case, the peeled film can be reused. If peeling electrification occurs when the film is peeled from the image receptor, dust is likely to be adsorbed, and glossiness is impaired in reuse. In that case, it is necessary to perform antistatic treatment so that the surface resistance of the release-treated film is 10 ¹⁴ or less.
In order to carry out antistatic treatment, conductive fine powder obtained by doping phosphorus or antimony with tin oxide fine powder having a particle size of 0.1 μm or less may be blended in the release treatment layer, and the film itself may have various conductive properties such as polyaniline. Molecules may be incorporated.

Further, as shown in FIG. 3, the toner receiving layer may be continuously subjected to a glossing treatment by using an endless belt-shaped film which is peeled off. In FIG. 3, the toner transfer recording image receiving body 10 is conveyed by the conveying roller 31 from right to left in the drawing. On the other hand, an endless or annular film 33 is stretched over a pair of other transport rollers 32 provided on the top of the image receptor 10, and a part of the film 33 is pressed against the upper surface of the image receptor 10 by the heating jig 34. In addition,
The peeling treatment is applied to the outer surface of the film 33.

[0031]

EXAMPLES Next, the present invention will be described more specifically with reference to Examples and Comparative Examples, but the present invention is not limited to these Examples. [Example 1] White P was used as the base material of the image receptor for toner transfer recording.
Using a ET film (E20, manufactured by Toray Industries, Inc., thickness: 38 μm), a resin solution having the following composition was applied on one side and dried to form a toner receiving layer (thickness: 8 μm). The Tg of the resin used for the toner receiving layer is 72 ° C.

Polyester resin solution (Vylon 29SS, manufactured by Toyobo Co., Ltd.) 20 g Methyl ethyl ketone 2 g Toluene 8 g A conductive paint having the following composition was further added to the wire bar #
It was applied as No. 5 and dried at 130 ° C. for 2 minutes to form a toner receiving layer. The surface resistance was 5 × 10 ¹¹ (Ω / □).

Conductive paint P-3261 (manufactured by Catalysts & Chemicals Industry Co., Ltd.) 10 g Methyl ethyl ketone 45 g Toluene 45 g The adhesive strength of the obtained toner receiving layer was evaluated by the following measuring method, and was 900 g / 25 mm.

Sample Preparation Adhesive Tape Polyester adhesive tape 31B manufactured by Nitto Denko Corporation (base material thickness 25 μm), width 25 mm Adhesion load: 1 reciprocation with a roller having a load of 2 kg is performed.

After sticking, it is left at 25 ° C. for 2 hours.

Measurement: Tensile speed, strength at 180 mm peeling was measured at 300 mm / min. On the other hand, the following adhesive was coated on the surface opposite to the toner receiving layer so that the dry thickness was 16 μm, and 25 Aging was performed at 7 ° C. for 7 days to form an adhesive layer, which was used as an image receptor paper.

Adhesive No. 1259F (manufactured by Soken Chemical Industry Co., Ltd.) 100 g curing agent E-AX (manufactured by Soken Chemical Industry Co., Ltd.) 0.5 g curing agent L-45 (manufactured by Soken Chemical Industry Co., Ltd.) 2.8 g Toluene 40 g Also, with a substrate thickness of 50 μm On one side of the PET film, UV-curable silicone resin with the following composition is dried to a thickness of about 0.1 μm
Was applied to prepare a separator paper. Next, the pressure-sensitive adhesive layer of the image-receiving sheet and the release-treated layer of the separator sheet were attached so as to be in contact with each other to prepare a toner transfer recording image-receiving element.

UV curable silicone resin (X-62-7223A, manufactured by Shin-Etsu Chemical Co., Ltd.) 2 g UV-cured silicone resin (X-62-7223B, manufactured by Shin-Etsu Chemical Co., Ltd.) 2 g Hexane 96 g Obtained in this way The copying machine (SF-8800; Sharp Corp.)
A test image was formed by using the product.

This is inserted into a film holder shown below and passed through a copying machine (FC-2; manufactured by Canon Inc.) for about 1 minute.
The surface of the image of the toner receiving layer was glossed by heating to 80 ° C. The results are shown in Table 1.

Preparation of Film Holder A polyimide film (thickness: 25 μm) was coated on one side with a solution having the following composition so as to have a dry thickness of 1.0 μm, and peeled off. The surface roughness Ra was 0.04.

Conductive fine powder dispersion liquid W-35 (manufactured by Catalysts & Chemicals Industry Co., Ltd.) 4 g Silicon graft acrylic resin US-210 (manufactured by Toagosei Kagaku Co., Ltd.) 10 g Methyl ethyl ketone 20 g Next, the release treated surface of the film Was bonded to another polyimide film (thickness: 50 μm) to form a laminated film holder. The heat shrinkage rate of the film used for the film holder is 0.2 in both the vertical and horizontal directions.
% Or less. The surface resistance of the peeled surface is 2 x 1
It was 0 ¹¹ (Ω / □).

[Example 2] Preparation of a toner transfer recording image receptor and formation of a surface thereof in the same manner as in Example 1 except that the dry coating thickness of the toner receiving layer in Example 1 was formed to be 4 µm. Lustered. The results are shown in Table 1.

[Embodiment 3] The thickness of the polyimide film subjected to the release treatment of the film holder in Embodiment 1 is 12
The gloss treatment of the image surface was performed in the same manner as in Example 1 except that the thickness was changed to μm. The results are shown in Table 1. The shrinkage rate of the polyimide film was 0.2% or less.

Comparative Example 1 A toner transfer recording image receptor was prepared and the surface thereof was prepared in the same manner as in Example 1 except that the dry coating thickness of the toner receiving layer was 3 μm. Lustered. The results are shown in Table 1.

Comparative Example 2 A toner transfer recording image receptor was prepared in the same manner as in Example 1 except that the solution having the following composition was applied to form a toner receiving layer having a dry thickness of 8 μm. The surface was glossed. The results are shown in Table 1. The Tg of the resin used for the toner receiving layer is 90.
It was ℃.

Blending solution Polyester resin (Elitel 3690, manufactured by Unitika Ltd.) 20 g Methyl ethyl ketone 48 g Toluene 32 g [Comparative Example 3] In Example 1 except that the thickness of the peeled polyimide film of the film holder was 50 μm A surface glossing treatment was performed in the same manner as in 1. The results are shown in Table 1. The shrinkage rate of the film is 0.2
% Or less.

[Comparative Example 4] A surface glossing treatment was carried out in the same manner as in Example 1 except that a solution having the following composition was used for the peeling treatment of the film holder. The surface roughness Ra of the film was 0.10.

Silicon graft acrylic resin US-210 (manufactured by Toagosei Kagaku Co., Ltd.) 10 g Methyl ethyl ketone 20 g Filler Tospearl 145 (manufactured by Toshiba Silicone Co., Ltd.) 0.5 g [Comparative Example 5] For toner transfer recording of Example 1 In the image receptor, a conductive coating material having the following composition was applied onto the toner receiving layer with a wire bar # 5 and dried at 130 ° C. for 2 minutes to prepare a toner receiving layer in the same manner as in Example 1. And evaluated. The adhesive strength was 450 g / 25 mm, and the surface resistance was 2 × 10 ¹¹ (Ω / □).

Conductive fine powder dispersion liquid W-35 (manufactured by Catalysts & Chemicals Industry Co., Ltd.) 2 g Silicon-grafted acrylic resin US-210 (manufactured by Toagosei Chemical Industry Co., Ltd.) 5 g [Comparative Example 6] Film in Example 1 The surface glossing treatment was carried out in the same manner as in Example 1 except that a PET film having a thickness of 25 μm was used as the peeled film of the holder. The heat shrinkage of the PET film used is M
It was 1.2% in the D direction and 0.2% in the TD direction. The results are shown in Table 1.
Shown in. The longitudinal shrinkage of the peeled film was 1.2%.

[0050]

[Table 1]

[0051]

INDUSTRIAL APPLICABILITY The toner transfer recording image receptor of the present invention has a high glossiness on the entire printing surface obtained by electrostatic transfer and exhibits a high-grade feeling. INDUSTRIAL APPLICABILITY The present invention is capable of imparting high gloss to the image surface of a predetermined image receptor by a simple method and is suitable for producing nameplates of various devices.

[Brief description of drawings]

FIG. 1 is a schematic cross-sectional view showing a toner transfer recording image receiver of the present invention.

FIG. 2 is an explanatory diagram showing a surface treatment method of the present invention.

FIG. 3 is an explanatory diagram showing another specific example of the surface treatment method of the present invention.

[Explanation of symbols]

 10 Image Receptor for Transfer Recording 11 Image Receptor Paper 12 Separator 13 Base Material 14 Toner Receptive Layer 15 Adhesive Layer 16 Separator Base Material 17 Release Processing Layer 20 Film Folder 21 Mount 22 Film 23 Release Processing Layer 24 Toner Image 31 Conveyor Roller 32 Conveyor roller 33 Film 34 Heating jig

Claims (5)

[Claims] 1. A toner transfer recording image receptor comprising a base material and a toner receiving layer provided on one surface of the base material.
The toner receiving layer contains a thermoplastic resin having a Tg of 50 to 80 ° C., the thickness of the toner receiving layer is 4 μm or more, and the adhesive strength of the surface of the toner receiving layer is 600 g / 25 mm or more when evaluated by the following measuring method. An image receptor for toner transfer recording characterized by the following. Sample preparation Adhesive tape Polyester adhesive tape 31B (base material thickness 25 μm) manufactured by Nitto Denko Corporation, width 25 mm Adhesion load Adhesion is performed by reciprocating once with a roller having a load of 2 kg. After sticking, leave at 25 ° C. for 2 hours. Measurement Measure the strength when peeling 180 ° at a pulling speed of 300 mm / min. 2. A base material, a toner-receiving layer provided on one surface of the base material, a pressure-sensitive adhesive layer provided on the surface of the base material opposite to the toner-receiving layer, and temporary adhesion on the pressure-sensitive adhesive layer. The toner transfer recording image receptor according to claim 1, which is for a label having a separator. 3. A method for producing a high-gloss image receptor, which comprises heating the image surface of the image receptor for toner transfer recording according to claim 1 in contact with a release-treated surface provided on the film, the method comprising: In each of the following test methods, the heat shrinkage ratio ε in the lateral direction is 1% or less, sample shape: 20 mm × 100 mm load: none pretreatment: 25 ° C. vacuum drying (10 ⁻³ Torr or less) for 24 hours heat treatment temperature: 150 ± 3 ° C. Treatment time: 30 minutes Shrinkage ε: When initial length is L1 and length after heat treatment is 30 minutes at room temperature is L2 ε = [(L1-L2) / L1] × 100 A method for producing a high-gloss image receptor in which the surface roughness Ra of the release treated surface is 0.05 or less. 4. The peeled film has a thickness of 10 to 4
The method for producing a high-gloss image receptor according to claim 3, which is a polyimide film having a thickness of 0 μm. 5. The method for producing a high-gloss image receptor according to claim 3, wherein the peel-treated film has an endless belt shape.