JP3993909B2 - Transparent antistatic protective transfer material and antistatic plate - Google Patents

Description

[0001]
[Industrial application fields]
In the field where static elimination is indispensable, such as a wall material of a clean room and a display member of a television, the present invention has antistatic properties, scratch resistance, The present invention relates to a surface protective transfer material that imparts stain resistance, solvent resistance, water resistance, and the like.
[0002]
[Prior art]
Conventional methods for producing anti-static plates include the direct coating of conductive paint on plastic and glass materials, and the use of plastic film coated with conductive paint by using dry laminating agents, adhesives, heat sealing, etc. Pasting it on plastic or glass materials has been done.
[0003]
[Problems to be solved by the invention]
However, the method of directly applying the conductive paint to the plastic material or the glass material is not good because the processing cost is high and the yield is low because the coating is performed one by one. Also, it was very difficult to obtain a good appearance. Furthermore, since a solvent is used, the facilities are large.
In addition, when a plastic film with a conductive paint applied to a plastic material or glass material is pasted together with a dry laminating agent or adhesive, problems such as peeling of the plastic film occur when used and stored for a long time. To do. In addition, there are many cases where the method of bonding by heat fusion is not possible depending on the type of glass material or plastic material.
Therefore, the object of the present invention is to solve the problems of processing cost, productivity, appearance, resistance, etc. in the conventional antistatic plate manufacturing method by using the transfer material of the present invention. The present invention provides a surface protective transfer material excellent in antistatic property, scratch resistance, appearance, stain resistance, solvent resistance, water resistance, and the like.
[0004]
[Means for Solving the Problems]
In order to solve the above problems, the transparent antistatic protective transfer material of the present invention is provided with a transparent surface protective layer having conductivity, which is made of an ionizing radiation curable resin, on a base film having releasability. An intermediate first layer made of butyral resin and isocyanate and an intermediate second layer containing at least butyral resin are provided on the substrate, and at least an adhesive layer is formed on the intermediate first layer.
[0005]
DETAILED DESCRIPTION OF THE INVENTION
The base film (1) having releasability used in the transparent antistatic surface protective transfer material of the present invention is not particularly limited, and has a releasability and a normal transfer foil having sufficient self-holding property. Any of those used can be used. For example, polyethylene terephthalate film, polypropylene film, polycarbonate film, polystyrene film, polyamide film, polyamideimide film, polyethylene film, synthetic resin film such as polyvinyl chloride film, artificial resin film such as cellulose acetate film, cellophane paper, glassine paper, etc. Examples thereof include film-like materials such as western paper and Japanese paper, composite film-like materials or composite sheet-like materials thereof, and those obtained by subjecting them to release treatment.
The thickness of the base film is not particularly limited, and a surface protective transfer material free from wrinkles or cracks can be easily produced by using a film having a thickness of usually 4 to 100 μm, preferably 9 to 50 μm. To preferred.
[0006]
The conductive ionizing radiation resin of the transparent conductive radiation curable resin layer (2) used in the transparent antistatic surface protective transfer material of the present invention is not particularly limited as long as it has conductivity, such as polypyrrole. And polyaniline alone or a mixture thereof. The ionizing radiation curable resin based on the conductive filler is not particularly limited. For example, urethane acrylate, polyester acrylate, epoxy acrylate, unsaturated polyester, silicon acrylate. And other special acrylates or a mixture thereof. The conductive filler is not particularly limited as long as it has conductivity. For example, tin oxide fine particles (tin oxide / zinc oxide, tin oxide / barium sulfate, tin oxide / aluminum borate, tin oxide / Examples thereof include potassium titanate, tin oxide / titanium oxide, tin oxide / antimony oxide, tin oxide / phosphorous), indium oxide-based fine particles (indium oxide / tin oxide, indium oxide / zinc oxide) and the like, or a mixture thereof. A paint dissolved in an organic solvent containing these as a main component is applied onto the base film (1) by ordinary printing methods such as gravure printing, screen printing, and offset printing, dried, and cured by ionizing radiation. And formed. There is no restriction | limiting in particular about the thickness of a radiation hardening resin layer, Usually, it employs | selects suitably from the range of about 1.0-10 micrometers. When it is less than 1.0 μm, it is difficult to cure, which is not preferable. On the other hand, when the thickness exceeds 10 μm, cracking of the coating film and conversely poor curing are undesirable.
The transparent expression as the transparent conductive radiation curable resin layer in the present invention refers to those having a haze of 1.0% or less and a total light transmittance of 80% or more.
Further, the expression of conductivity is that the surface (electrical) resistance value is 10 ¹⁰ or less, preferably 10 ⁹ or less and 10 ² or more, and more preferably 10 ⁹ or less and 10 ⁴ or more.
[0007]
As the intermediate first layer (3) used as necessary in the surface protective transfer material of the present invention, a paint in which a mixture of a butyral resin and an isocyanate is dissolved in an organic solvent is obtained by gravure printing or screen printing. A method of applying and drying on the ionizing radiation curable resin layer by a normal printing method such as an offset printing method or an offset printing method.
Although there is no restriction | limiting in particular about the polymerization degree of a butyral resin, The thing of about 800-2000 is preferable.
The mixing ratio of butyral resin and isocyanate is preferably in the range of 98: 2 to 50:50. When the isocyanate ratio is 2 or less, or the butyral resin ratio is 50 or less, strong adhesion to the ionizing radiation curable resin layer cannot be obtained.
The thickness of the intermediate first layer is preferably in the range of 0.1 to 2.0 μm. When the thickness is less than 0.1 μm, strong adhesion to the ionizing radiation curable resin layer cannot be obtained. When the thickness is 2.0 μm or more, the physical properties of the intermediate second layer adversely affect the physical properties of the surface protective transfer material. Further, it is not preferable from the viewpoint of cost.
[0008]
As the intermediate second layer (4) used as necessary in the surface protective transfer material of the present invention, a paint obtained by dissolving a butyral resin alone or a mixture of other resins in an organic solvent is gravure printing, screen printing, offset Examples thereof include those formed by applying and drying on the intermediate first layer (3) by a normal printing method such as a printing method. Further, the thickness of the intermediate second layer (4) is preferably in the range of 0.1 to 2.0 [mu] m for the same reason as the intermediate first layer (3). The intermediate second layer (4) may have a property as a printing layer provided with an arbitrary pattern or pattern, or may be a laminate of a printing layer (4 ′) provided with an arbitrary pattern or pattern. Good. This printed layer (4 ′) has the same thickness and production method as the intermediate second layer (4). There is no restriction | limiting in particular as an adhesive layer ( 5 ) used in the surface protection transfer material of this invention, It selects from the resin used for a normal transfer material suitably, and is used. For example, acrylic, vinyl acetate, vinyl chloride, styrene-butadiene, vinyl chloride-vinyl acetate, ethylene-vinyl acetate, polyester, chlorinated rubber, chlorinated polypropylene, urethane, etc. The emulsion resin, organic solvent resin, and water-soluble resin mainly composed of these mixtures are appropriately selected and used.
[0009]
Adhesive layer (5) is a coating solution obtained by diluting the resin with water or an organic solvent and applied onto the intermediate second layer (4) or printed layer (4 ^' ) by gravure printing, screen printing, or offset printing. Formed by drying. The thickness of the adhesive layer is not particularly limited, and is usually selected and adopted from a range of about 0.3 to 20 μm according to the surface state of the transfer object.
By using the transparent antistatic surface protective transfer material obtained in this way and transferring to a plastic material or glass material by the laminating transfer method or press transfer method, all of the conventional antistatic plate preparation methods had Solve all the issues such as processability including cost, antistatic, appearance, transparency, workability, resistance, etc., and antistatic, scratch resistance, appearance, transparency, resistance It is possible to provide an antistatic plate having an effect excellent in contamination, solvent resistance, water resistance and the like.
[0010]
【Example】
Hereinafter, the present invention will be described in detail with reference to examples.
Hereinafter, the part in an Example shows a weight part.
EXAMPLE A solution comprising 10 parts of urethane acrylate, 5 parts of epoxy acrylate, 25 parts of tin oxide / indium oxide, 40 parts of toluene, 5 parts of MEK, and 15 parts of IPA on a biaxially stretched polypropylene film having a thickness of 12 μm. Was applied by a reverse coating method, dried, and cured by ionizing radiation to form a transparent conductive ionizing radiation curable resin layer having a thickness of 3.5 μm. On this transparent conductive ionizing radiation curable resin layer, a solution comprising 8 parts of butyral resin, 2 parts of isocyanate, 50 parts of toluene and 40 parts of MEK was applied by a gravure coating method and dried to a thickness of 0.2 μm. An intermediate first layer was formed. On this intermediate first layer, a solution consisting of 5 parts of butyral resin, 5 parts of acrylic resin, 50 parts of toluene and 40 parts of MEK was applied by gravure coating and dried to form an intermediate second layer having a thickness of 0.3 μm. Formed. Further, a solution comprising 20 parts of acrylic resin, 60 parts of toluene and 30 parts of MEK was applied on the intermediate second layer by a river coating method and dried to form an adhesive layer having a thickness of 1.0 μm. A surface protective transfer material was obtained.
The transparent antistatic protective transfer material thus obtained was transferred to an acrylic plate having a thickness of 5 mm by a laminate transfer method to obtain an antistatic plate.
[0011]
Comparative Example A solution comprising 10 parts of urethane acrylate, 5 parts of epoxy acrylate, 25 parts of tin oxide / indium oxide, 40 parts of toluene, 5 parts of MEK, and 15 parts of IPA was directly rolled on an acrylic plate having a thickness of 5 mm. The coating was applied, dried, and cured by ionizing radiation to form a 3.5 μm thick ionizing radiation curable resin layer to obtain an antistatic plate.
[0012]
<Evaluation method>
The evaluation of adhesion was carried out using a Nichiban cello tape, and the degree of peeling was evaluated by the cross-cut peeling method shown below.
<Cross-cut peel method>
Draw 11mm vertical lines and 11mm horizontal lines with a cutter knife on the transfer surface to make a total of 100 squares, and a 24mm wide Nichiban tape on top of it, quickly serotape 180 degrees The film was forcibly peeled and evaluated in 5 stages according to the number of remaining cells.
The rank of the adhesion rank is shown below.
Rank; Content 5; 95-100 / 100 (Peeled cells 0-5)
4; 80-94 / 100 (peeled cells 6-20)
3; 60-79 / 100 (peeled cells 21-40)
2; 30-59 / 100 (peeled cells 41-70)
1; 0-29 / 100 (peeled cells 71-100)
The conductivity was evaluated by comparing the surface resistance value with a value measured by Toa Radio Industry Co., Ltd. SM-10 / SME-8311.
The appearance was compared and evaluated visually.
For the evaluation of transparency, a comparative evaluation was performed using values obtained by measuring total light transmittance (%) and haze (%) with NDH-1001DP type manufactured by Nippon Denshoku Industries Co., Ltd.
[0013]
<Evaluation of interlayer adhesion>
Example 5
Comparative example 5
<Evaluation of conductivity>
Example: 1 × 10 ⁷ Ω / □
Comparative example: 5 × 10 ⁷ Ω / □
The example is superior in conductivity compared to the comparative example.
<Evaluation of appearance>
Example: No defects in appearance such as coating unevenness and coating streaks.
Comparative example: Application irregularities due to the unevenness of the acrylic plate, and defects on the mill due to paint. Many foreign substances are mixed.
<Evaluation of transparency>
Total light transmittance (%)
Example ... 89
Comparative example ... 75
Haze (%)
Example ... 0.7
Comparative example 2.1
[0014]
【The invention's effect】
Since the surface protective transfer material of the present invention is a transfer material having a conductive ionizing radiation curable resin layer, the use of the surface protective transfer material includes a cost that has been difficult to obtain by a conventional method for producing an antistatic plate. An antistatic plate excellent in processability, antistatic property, scratching property, appearance, transparency, and other resistance can be provided.

Claims (4)

Transparent antistatic protection characterized in that a transparent conductive ionizing radiation curable resin layer (2) is provided on the surface of the base film (1) having releasability and at least an adhesive layer (5) is provided thereon. A transfer material,
The surface resistance value of the transparent conductive radiation curable resin layer (2) is 10 ⁴ Ω / □ to 10 ⁹ Ω / □,
In order to improve the adhesion between the transparent conductive ionizing radiation curable resin layer (2) and the adhesive layer (5) between the transparent conductive ionizing radiation curable resin layer (2) and the adhesive layer (5). to become provided two layers of the intermediate first layer and (3) the intermediate second layer (4),
The intermediate first layer (3) is composed of butyral resin and isocyanate, and the weight ratio of butyral resin and isocyanate is 95: 5 to 50:50,
The intermediate second layer (4) comprises at least a butyral resin and is different from the intermediate first layer (3);
Transparent antistatic protective transfer material. In the transparent antistatic protective transfer material according to claim 1,
The intermediate second layer (4) for improving the adhesion has an arbitrary pattern or handle ,
Transparent antistatic protective transfer material. In the transparent antistatic protective transfer material according to any one of claims 1 and 2,
A printed layer (4 ′) having an arbitrary pattern or pattern is further laminated on the surface of the intermediate second layer (4) for improving the adhesion ,
Transparent antistatic protective transfer material. It can be obtained by transferring the transparent conductive radiation curable resin layer onto a transparent substrate using the transparent antistatic protective transfer material according to any one of claims 1 to 3.
An anti-static board characterized by