JPH09267445A - Matte film - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a matte film excellent in the adhesiveness with toner and passing properties and enhance in surface harness by using a base material, a polymer to which ion conductivity is imparted and a matte layer containing a matting agent and subjected to antistatic treatment. SOLUTION: A matte film is formed from a base material, a polymer to which ion conductivity is imparted and a matte layer containing a matting agent and subjected to antistatic treatment. As the base material, there is a plastic film composed of polyester, polycarbonate, cellulose acetate or polyimide and the polymer to which ion conductivity is imparted contains a monomer having a cationic, amphotoeric, anionic or nonionic ion conductive group in its side chain. As a concrete example of the matting agent, there is extender pigment such as fine powdery silica, alumna or calcium carbonate and, when concealability is required, white pigment such as titanium dioxide is user together with the extender pigment.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mat film having an antistatic mat layer, which is used for copying or output by a PPC, a laser printer or the like, or for drawing.

[0002]

2. Description of the Related Art Conventionally, synthetic paper, drafting film, tracing film, etc. have been used for output of PPCs, laser printers, etc. However, since these have not been provided with an antistatic function, PPCs, lasers, etc. When paper was passed through the printer, the paper was double-fed due to the static electricity generated by the friction. Therefore, as a solution to such a drawback, a recording paper has been proposed in which a mat layer and a conductive layer for preventing electrification are sequentially laminated on a base material (Japanese Patent Publication No. 2-59777).

A conventional antistatic layer has an antistatic agent bleeding on the surface to exert its effect, but such an antistatic layer has a low surface hardness. Therefore, when writing on the antistatic layer with a pencil, the added portion of the antistatic layer is scraped off and cannot be used as a drawing film. On the other hand, the matte layer as a film for drawing needs to have a certain surface hardness in order to withstand writing with a pencil or the like. For this reason, a curable resin that easily exhibits surface hardness is often used as the resin forming the mat layer.

However, when such a curable resin is used as a binder, the antistatic agent does not bleed to the surface because the matte layer is cured even when the antistatic agent is further added. Therefore, despite the addition of the antistatic agent, the antistatic effect cannot be obtained.
Further, the high molecular type antistatic agent can form an antistatic layer by itself because it has a film-forming property, but since the surface hardness is too low, it has the same drawbacks as described above, and it is There are similar drawbacks when used together.

Therefore, it is considered that Japanese Patent Publication No. 2-59777 employs a two-layer structure in which an antistatic layer is laminated on a mat layer.

Such a recording paper has good adhesion to toner, good paper-passing properties in a copying machine, and is free from warpage and wrinkling due to environmental changes such as temperature and humidity. However, a conductive layer is formed on the matte layer. Since the technical idea of stacking is adopted,
The number of manufacturing processes has increased, and the manufacturing cost of products has increased accordingly.

[0007]

In view of the above circumstances, the present invention is excellent in adhesiveness with toner and paper-passing property, and
It is an object of the present invention to provide a matte film which has a high surface hardness and can be manufactured at low cost.

[0008]

In order to achieve the above object, the present invention comprises a base material and an antistatic mat layer containing a polymer having ion conductivity and a matting agent. A matte film is provided.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION The base material is preferably one that does not warp or wrinkle due to environmental changes such as temperature and humidity, and is thin so as not to be bulky, and transparent or opaque is not required. Examples thereof include plastic films made of polyester, polycarbonate, cellulose acetate, polyimide, polyethylene, polystyrene, polypropylene and the like. Further, when used as a copy sheet, a polyester film having particularly excellent heat resistance is preferable. As the base material, a plastic film on which one or both sides of Washi paper or Western paper are attached via an adhesive can be used. Washi paper or western paper has the effect of not only increasing the texture and texture, but also preventing the occurrence of waviness of the plastic film caused by the fixing heat during copying and maintaining good flatness. The raw materials for Japanese paper include swordfish, hemp, Japanese camellia, goose bark, and the raw materials for western paper include wood pulp and synthetic pulp, both of which are formed by mechanical polishing. Thickness is about 6 ~ 29g / m ²
And preferably 9 to 15 g / m ² . An adhesive may be used when laminating Japanese paper or Western paper on a plastic film. Examples of the adhesive used include urea resin type, phenol type, resorcinol type, epoxy type, polyurethane type, polyester type, isocyanate type, vinyl acetate type, acrylic type, cyanoacrylate type, copolymer nylon type, modified rubber type An adhesive such as

The mat layer provided on the substrate is composed of at least a polymer having ionic conductivity and a matting agent.

The polymer having ionic conductivity is a polymer containing a monomer having an ionic conductive group in its side chain. The monomer having an ion conductive group in such a side chain may be any of a cation type, a zwitterion type, an anion type and a nonion type, but a cation type,
Since the amphoteric ion type has greater ionic conductivity than the anionic type and nonionic type and is effective in suppressing charging, it is desirable to use a cation type or zwitterionic type monomer. The monomer having such a cation-type ion conductive group is a polymerizable monofunctional vinyl monomer having a quaternary ammonium group at the terminal, and specifically, dimethylaminoethyl acrylate quaternary chloride and dimethylamino. Ethyl methacrylate quaternary chloride, diethylaminoethyl acrylate 4
Examples thereof include quaternary chloride, diethylaminoethyl methacrylate quaternary chloride, p-dimethylaminostyrene quaternary chloride and p-diethylaminostyrene quaternary chloride. On the other hand, examples of the monomer having a zwitterionic ion-conductive group include betaine compounds of the above monomers, and these monomers can be used alone or in combination of two or more.

The monomer having an ion conductive group on the side chain is a monofunctional vinyl monomer having a hydroxy group at the terminal such as 2-hydroxyethyl acrylate or 2-hydroxyethyl methacrylate, or the monofunctional vinyl monomer. Acrylic acid, methacrylic acid and its esters, styrene and its derivatives, other monofunctional vinyl monomers such as vinyl acetate (other monomers, the same applies hereinafter) that are copolymerizable with the monomers, especially It is preferably used by copolymerizing with a monomer having a hydroxy group and a monomer having a carboxyl group.

The antistatic layer of the present invention is mainly composed of the above-mentioned copolymer having ionic conductivity, but a crosslinking agent, a curing agent or the like can be added if necessary.
It is preferable to add such a cross-linking agent or a curing agent to cure the antistatic layer, because the surface hardness suitable for drawing can be obtained. Glycidyl derivatives such as epoxy resins and amines and polyamide resins as their curing agents, and polyester resin / isocyanate derivatives and the like can be used as effective additives.

The monomer having an ion conductive group in the side chain is 10 to 50% of the total monomers including other monomers.
It is preferable to mix in the range of (% by weight, the same applies hereinafter). The greater the amount of the monomer having an ion conductive group, the more excellent the antistatic effect is obtained. However, considering the adhesiveness to the substrate, the range of 15 to 30% is particularly preferable.

The surface of the matte layer has a Ra of 0.
It is adjusted by adding a matting agent so as to be about 1 to 5 μm. This is to impart irregularities to the surface and improve the writability of a pencil or the like. As such a matting agent, an extender pigment such as finely powdered silica, alumina, or calcium carbonate is used. Also, when used for something that requires concealment,
A white pigment such as titanium dioxide, antimony oxide or zinc sulfide may be used together with these extender pigments.

The matting agent is used by mixing 10 to 40% with respect to 100% of the above-mentioned copolymer having ionic conductivity and other resin added as required. That is, 10
If it is less than 40%, it is not possible to obtain surface irregularities for obtaining proper pencil writability, and if it exceeds 40%, it adversely affects the prevention of double feeding of paper.

By the way, the ionic conductivity-imparting copolymer used in the mat layer of the present invention has a surface resistance value of 10 even when the coating film is cured by adding a curing agent. It can be lowered to about ⁶ to 10 ⁷ Ω / □. However, when the surface resistance value is low as described above, the toner transferability of the PPC tends to be deteriorated although it can contribute to the prevention of the double feed when the paper is supplied from the paper supply unit of the copying machine. Therefore, considering the toner transferability, the appropriate range is 10 ⁹ to 10 ¹³ Ω / □, preferably 10 ¹⁰ to ¹⁰
It is necessary to adjust the surface resistance value of the mat layer surface within the range of 10 ¹² Ω / □. From this point of view, the amount of the matting agent added is 10 to 40% with respect to 100% of the resin (copolymer having ion conductivity and other resin added as necessary).
Must be compounded.

In the mat layer thus constituted, the above-mentioned copolymer and matting agent, and other resins and additives added as necessary are added with water, methanol, ethanol,
Isopropyl alcohol, acetone, methyl ethyl ketone, methyl isobutyl ketone, ethyl acetate, toluene,
It can be formed by dissolving or dispersing in a suitable solvent such as xylene to prepare a coating solution, and coating and drying it on a substrate by a conventional method. The coating method may be a conventional coating means such as a gravure coater, roll coater, wire bar or the like.
The coating amount of the coating liquid is preferably such that the thickness of the formed mat layer is in the range of about 1 to 20 μm.

As the polymer having such ionic conductivity, for example, Bondip (trade name, Konishi Co., Ltd.) commercially available as a two-pack type antistatic adhesive can be used.

The matte layer of the present invention thus formed has a surface hardness such that peeling does not occur when applied with a pencil, but it is also excellent in toner transferability such as PPC. Therefore, it is not necessary to laminate the antistatic layer on the mat layer as in the conventional case, which can contribute to the reduction of manufacturing cost.

When the mat layer is provided on one side of the substrate, another layer such as a curl prevention layer may be provided on the opposite side of the substrate from the mat layer.

[0022]

The present invention will be described more specifically with reference to the following examples. In addition, "%" and "part" in this example are based on weight unless otherwise specified.

[Example 1] The following matte layer coating solution was applied to one side of a polyester film having a thickness of 50 µm by a bar coater, dried at 80 ° C for 2 minutes, and then cured at 40 ° C for 48 hours. Through the ring, thickness 3μm
The matte layer was formed to obtain a matte film. The surface resistance value of the matte layer was measured according to JIS-K6911 and found to be 2.0 × 10 ⁹ Ω / □.

<Mat layer coating liquid> -Acrylic resin solution (solid content: about 30%) 10 parts (Bondip PX main agent: Konishi Co., Ltd.)-Epoxy resin solution (solid content: about 10%) 10 parts (Bondip PX curing) Agent: Konishi) ・ Silica 1 part (Sylysia 445: Fuji Silysia Chemical Ltd.) ・ Isopropyl alcohol 15 parts ・ Water 5 parts

Example 2 An acrylic resin emulsion type adhesive was applied to both sides of a 12 μm thick polyester film by a roll coater so as to be 3 g / m ² , dried and then 14 g / m ² of Japanese paper was applied to both sides. A matte layer was formed on both surfaces of the base material to which the above-mentioned was adhered by using the coating solution for matte layer of Example 1 in the same manner as in Example 1 to obtain a matte film. When the surface resistance value of the matte layer was measured according to JIS-K6911, it was 2.6 × 10 ⁹ Ω / □.

[Comparative Example 1] The following matte layer coating solution was applied to one side of a polyester film having a thickness of 50 μm by a bar coater and dried at 80 ° C. for 2 minutes to give a thickness of 3 μm.
The matte layer was formed to obtain a matte film. When the surface resistance value of the matte layer was measured according to JIS-K6911, it was 1.0 × 10 ¹⁴ Ω / □ or more.

<Mat layer coating liquid> • Polyester resin (100% solid content) 6 parts (Vylon # 200: Toyobo Co., Ltd.) • Silica 1.5 parts (Sylysia 435: Fuji Silysia Chemical Ltd.) • Methyl ethyl ketone 10 parts. Anon 10 parts ・ Toluene 10 parts

[Comparative Example 2] A matte film was obtained by forming the matte layer on the both surfaces of the same substrate as in Example 2 using the coating solution for the matte layer of Comparative Example 1 in the same manner as in Comparative Example 1. The surface resistance value of the matte layer was measured according to JIS-K6911 and found to be 2.4 × 10 ¹¹ Ω / □.

An ash adhesion test was carried out for the presence or absence of triboelectric charging on the mat layer of the mat films obtained in Examples and Comparative Examples. The ash adhesion test of triboelectrification was 23 ° C, 50%
In the RH environment, using a gauze, the mat layer surface of a 10 cm square test piece was rubbed back and forth 10 times, and the degree of adhesion of tobacco ash was visually evaluated.

As a result, in the ash adhesion evaluations of Examples 1 and 2, almost no ash was attached, whereas in Comparative Examples 1 and 2, ash was attached considerably.

Further, in the case of Examples 1 and 2, double feeding did not occur when the sheet was passed through the laser printer, but Comparative Examples 1 and 2
The thing was double-fed.

Further, in each of Examples 1 and 2, the writability with a pencil was good, and the mat layer did not peel off at that time. The sample of Comparative Example 2 showed better writability than that of Comparative Example 1, but was inferior to Examples 1 and 2.

Further, in Examples 1 and 2, the toner transferability and fixing property during PPC copying were very good, and even if the adhesive tape was pressed, the toner did not fall off. In Comparative Examples 1 and 2, since the thermoplastic resin is used as the resin of the mat layer, the toner fixability is good, but the toner transferability is poor, and when the pressure-sensitive adhesive tape is pressed, the toner is slightly transferred. The toner was found to have fallen off.

In addition, in Examples 2 and Comparative Example 2, the flatness of the matte film itself after copying was excellent.

[0035]

Since the matte film of the present invention contains a specific antistatic agent in the matte layer, the necessary antistatic effect can be imparted without lowering the hardness of the matte layer. Therefore, it is not necessary to stack the antistatic layer on the mat layer as in the conventional case, and there is an effect that the manufacturing cost can be reduced.

Claims (1)

[Claims] 1. A matte film comprising a base material and an antistatic matte layer containing a polymer having ionic conductivity and a matting agent.