JPS5951908B2 - pine film - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a matte film, and more particularly to a matte film in which the surface of the matte layer is overcoated with a polymer in a glass state.

Chemical and plastic film are processed into sand mats by using a plastic film as a support and providing a coating layer containing a matting agent such as glass powder, silica powder, clay powder, or titanium oxide powder on the surface. Matte films and the like are well known.

However, such conventional matte films have the disadvantage that when the matte surface contacts and rubs against acrylic decorative boards, varnished surfaces, etc., they are damaged and the matte surface itself becomes white.

Furthermore, even if the whitened matte surface is wiped with a cloth, the whitening cannot be corrected. For this reason, at present, a soft filler is used in the matte layer as a matting filler to prevent any small amount of scratches from the acrylic plate or varnished surface from adhering to the matte layer surface. This is the reality.

However, because a soft filler was used, the matte layer often peeled off when writing with a hard lead of 5H or higher, and the pencil erasability with an eraser was poor.
The gloss of the matte layer surface in the areas erased with an eraser increases,
Furthermore, there are drawbacks such as increased transparency and the possibility of leaving traces of erasure. The fact that such a phenomenon is observed is disadvantageous in that when the matte film is used, particularly when it is applied to original copies, traces of scratches or erasures appear on the prints. An object of the present invention is to provide a matte film that maintains its matte state at all times without causing the above-mentioned disadvantages.

That is, the matte film of the present invention is characterized in that a matte layer and a thin layer of resin in a glass state covering the matte layer are laminated on a plastic film.

The present invention will be explained in more detail below.

Examples of the plastic film used as the support include sheets having good dimensional stability and mechanical properties such as polyester, polycarbonate, triacetate, and polypropylene, and among them, a polyester film having a thickness of about 25 to 200 μm is preferred. The matte layer has a surface roughening agent dispersed in a binder resin. Examples of the surface roughening agent include silica powder and glass powder, and the particle size thereof is preferably about 0.1 to 30 μm. In addition, the binder resin includes thermosetting acrylic resin, amino resin, epoxy resin,
Vinyl chloride resin, urethane resin, etc. are used. The thickness of the matte layer is preferably about 10-15 μm, and the blending ratio of the binder resin and the surface roughening agent is 1:0.5-4.0 (weight ratio).
is appropriate. If the adhesion between the plastic film and the matte layer is not satisfactory, add a precoat layer (
It is desirable to provide an adhesive layer (made of vinyl chloride resin, vinyl acetate resin, vinyl chloride monovinyl acetate copolymer resin, etc.).

Now, as mentioned above, in the mat film of the present invention, the surface of the mat layer is coated with a polymer having a glassy state.

This protects the pine layer and prevents it from becoming white due to rubbing. The overcoat resin used herein is, for example, a crystalline polymer such as polyethylene, polyester, polypropylene, or polyacrylonitrile, or an organic glass (colorless and transparent plastic) such as polymethyl methacrylate, polystyrene, or polyvinyl chloride.

These polymers easily form a transparent thin layer in a glass state and have very good film forming properties, and have almost no effect on the optical properties of the matte film. In addition, for products made using organic solvents such as chemical resin matt film (plastic film with a mat layer provided), it is necessary to pay attention to solvent resistance, but the above resins do not contain emulsions. Since there are many types, the pine film of the present invention is not limited by its solvent resistance. Furthermore, the glass transition temperature of the overcoat resin used in the present invention is preferably in the range of 300 to 400K.

If the temperature is less than 3000K, the resin becomes sticky, and if it exceeds 4000K, the hardness of the resin increases, causing the resulting pine film to curl or changing its stiffness.

In order to actually produce the matte film of the present invention, for example, an emulsion or latex of the above-mentioned overcoat resin may be coated on a chemical matte film and heated to form a thin layer.

The thickness of this thin layer of resin (resin in a glass state) is 0.
A suitable thickness is 2 to 2.0 μm. If the layer is thinner than 0.2 μm, whitening due to rubbing cannot be prevented, and if the layer is thicker than 2.0 μm, the writability will be impaired.

Particular attention should be paid to the manufacturing process of the matte film of the present invention, in which the thin resin layer covering the surface of the matte layer is in a "glass state".
The purpose is to control the film-forming heating temperature so that the following can be maintained thereafter.

If this fails (for example, if the thin resin layer begins to have a crystalline structure), the matte film will no longer be able to perform its full functions, including writability. As mentioned above,
According to the pine film of the present invention, the intended purpose is achieved,
Furthermore, it has the advantage of being used not only as an original drawing for copying but also as a general purpose.

Next, examples will be shown. Example 1 Methyl isobutyl ketone 200g Methyl cellosolve 300g Cellulose acetate propionate (manufactured by Eastman Kodatsuta) 60g Trichloroacetic acid 10g Urethane resin (
Nitsuporan 2304, manufactured by Nippon Polyurethane Co., Ltd.)
230g glass powder
A chemical matte film was prepared by coating 170 g of the composition on a polyester film (about 50 μm thick) and drying it at 130° C. for 1 minute to form a matte layer about 10 μm thick.

Next, polyvinyl acetate lattetus (Sevian A-52
2, manufactured by Daicel KK) was applied on the matte layer, and 10
A thin resin layer having a thickness of about 1.0 μm was formed by heating at 0° C. for 1 minute to obtain a pine film.

Example 2 On the mat layer of the chemical mat film of Example 1, sulfonic acid Na salt of acrylic methacrylic copolymer (Sevian A-46704, manufactured by Daicel KK) was applied, and
A thin resin layer having a thickness of about 1.0 μm was formed by heating at 0° C. for 1 minute to obtain a pine film.

Example 3 An acrylic emulsion polymer (Honcoat SFC-5) was applied onto the matte layer of the chemical matte film of Example 1.
4. Apply 100℃ (manufactured by Dainippon Ink Chemical KK) and heat at 100℃.
A thin resin layer having a thickness of about 0.8 μm was formed by heating for a minute to obtain a matte film.

Example 4 A styrenic emulsion polymer (Almatex B-3) was applied onto the mat layer of the chemical matte film of Example 1.
700, manufactured by Mitsui Toatsu Kagaku KK) and heated at 100°C.
A thin resin layer having a thickness of about 1.2 μm was formed by heating for a minute to obtain a matte film.

The test results of the above chemical mat film (conventional product) and four types of mat film (products of the present invention) are summarized in the table below.

*(1) Place the thin resin layer side (matte layer side for conventional products) on the acrylic decorative board so that it is in contact with the 1.5 kg
/ A pine film (or chemical pine film) was moved while applying a load of 3 cm2 to create abrasion marks, and the scratches were wiped off with a cloth and examined.

The judgment was as follows: ○ means that no fingerprints remain when reprinted with a diazo copying machine, and × means that fingerprints remain.

*(2) Draw a thin line with a Mitsubishi Uni 5H pencil, and at that time,
A mark of ○ indicates that the thin resin layer (matte layer for conventional products) does not peel or slip, making writing difficult.

*(3) Using Tombo monoplastic eraser,
If no pencil mark remains or the erased area does not shine, it is marked as ○ (otherwise, it is marked as ×).

Claims (1)

[Claims] 1. A matte film characterized in that a matte layer and a thin layer of resin in a glass state covering the matte layer are laminated on a plastic film.