JP3088115B2 - Transparent printing paper - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention is applicable not only to printing with a general drying oil type ink, but also to recording by various printers as a film for various cards, labels, overhead projectors and the like. Yes, further, by using a film that can be molded into the substrate,
The present invention relates to a transparent printing paper that can be used as various printable packaging materials.

[0002]

2. Description of the Related Art In general, plastic films are excellent in transparency, processability, mechanical strength, light resistance, weather resistance, chemical resistance and the like. In addition to using special inks, printing methods are also limited.

[0003]

That is, with a plastic film, the drying and curing of the ink is extremely slow, so that printing with ordinary ink is difficult. Therefore, there is one that forms a porous modified layer on the surface of a plastic film to impart ink absorbency and facilitates printing,
This has the problem that transparency is impaired.

[0004] In recent years, recording means such as printing has become diversified. However, the plastic film having a porous modified layer formed on its surface cannot be used for all recording means. In particular, in order to be able to be used as a film for an overhead projector (OHP), it is desirable that the film is a transparent and printable plastic film. If a transparent printing paper that can also be used is developed, it will be extremely useful.
Therefore, the problem to be solved by the present invention is the OHP
It is an object of the present invention to provide a transparent printing paper that can be used not only as a film for printing but also for various printings including offset printing, recording by a wire dot printer, a thermal transfer printer, and the like, and further can be used as various packaging materials.

[0005]

DISCLOSURE OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and comprises at least one surface of a substrate made of a transparent plastic film. An ink fixing layer is provided by applying a coating liquid containing an emulsion of a copolymer resin as a main component or a coating liquid containing a polynorbornene resin as a main component.

That is, the present invention improves the fixing property of the ink by modifying the surface of the film, in other words, the ink has good adhesion (wetting), absorptivity, and dry curability, and is suitable for various types of recording means. An object of the present invention is to provide a transparent printing paper which is applicable and has excellent scratch resistance, stain resistance, slipperiness and the like generally required as printing paper.

[0007] In addition, by using a moldable film for the base material, it can be used as various packaging materials, and by using a printed packaging material, the commercial value of the packaged product can be increased.

Next, the present invention will be described in detail. The plastic film as the base material may be transparent, for example, a polyolefin film such as a polyethylene film or a polypropylene film, a polyester film, a polycarbonate film, a triacetate film, a polyethersulfone film, a vinyl chloride film, a methyl methacrylate and the like. There are various acrylic films, cellophane films and the like. Among them, a polyester film, a vinyl chloride film, a polypropylene film or a triacetate film is preferred. These plastic films may have been subjected to a treatment for improving the adhesion of the ink to the fixing layer in advance.

Further, by using a moldable transparent film such as a non-stretched polyester film and a transparent vinyl chloride film, molding after printing becomes possible.

The component constituting the ink fixing layer is a vinyl chloride-vinyl acetate copolymer resin or a polynorbornene resin. Here, vorinorbornene is commercially available from Zeon Kasei Co., Ltd. under the trade name Nosorex, and synthesizes norbornene from ethylene and cyclopentadiene by a Diels-Alder reaction, and performs ring-opening polymerization of this norbornene monomer. Is obtained by
It has an extremely porous structure.

By using these resins, the ink setting property is improved. Particularly, in the case of polynorbornene resin, the blocking resistance is further excellent. On the other hand, if blocking occurs when using a vinyl chloride-vinyl acetate copolymer resin, it is effective to add colloidal silica. Colloidal silica has a particle size of 5 × 10 ^-3 μm
It refers to a colloidal liquid in which fine spherical silica of m to 0.1 μm is dispersed in water. By adding this colloidal silica, heat blocking resistance and wet heat blocking resistance,
The scratch resistance, antistatic property and the like are also improved. The amount of colloidal silica added must be within a range that does not impair transparency.

As a method of mixing these components, the coating liquid can be adjusted by simply mixing and stirring. Further, it may be a colloidal silica composite particle emulsion.
In addition, since colloidal silica was added to the vinyl chloride-vinyl acetate copolymer resin, when the ink setting property was insufficient, a small amount of vinyl chloride-acrylic copolymer resin was added to improve the ink setting property without impairing the transparency. improves.

For the purpose of further improving the scratch resistance, if necessary, other resin components (for example, polyester resin, polyvinyl chloride resin, polyvinyl acetate resin, polyvinyl alcohol, cellulose derivative, melamine resin, isocyanate crosslinking) (Resin). Further, in order to improve the film running property during offset printing, a small amount of filler such as silica powder may be mixed to the extent that transparency is not impaired.

[0014]

As described above, the transparent printing paper of the present invention is provided with the above-mentioned ink fixing layer on the surface, so that the printing ink setting property, the ink drying property and the ink fixing property are good. In general, ink setting affects high-speed printing and efficiency. Even if a little beautiful printing can be performed, economical printing is impossible if the printing speed is slow due to set-off and the printed materials cannot be stacked. However, in the printing paper of the present invention, the ink is strongly retained in the ink fixing layer on the film surface, the solvent component in the vehicle is absorbed by the ink fixing layer, and the viscosity of the ink is sufficiently increased. Even when films are stacked with incomplete drying and curing by oxidative polymerization of drying oil, set-off does not occur.

When a vinyl chloride-vinyl acetate copolymer resin is used for the ink fixing layer, by mixing the colloidal silica, the hydroxyl groups of the colloidal silica are dehydrated and condensed when the coating film component is dried and cured, A siloxane-bonded Si—O—Si is formed to form a strong three-dimensional network structure. Therefore, the hardness of the coating film on the surface of the ink fixing layer is increased, and the scratch resistance is improved. Furthermore, since colloidal silica is mixed in the ink fixing layer, even when the films are stacked and stored in a large amount and stored in a high-temperature or high-temperature and high-humidity environment for a long period of time, the sticking phenomenon of the films does not occur. Thus, the scratch resistance and the moist heat resistance are remarkably improved.

[0016]

Next, an embodiment of the present invention will be described. Example 1 Vinyl chloride-vinyl acetate copolymer resin emulsion (Viniblanc 240, solid content 45%, manufactured by Nissin Chemical Co., Ltd.) 100 parts colloidal silica (Snowtex-20L, solid content 20%, Nissan Chemical Industry Co., Ltd.) ) 80 parts Water ... 100 parts of an aqueous paint was applied to one side of a transparent polyester film (100 μm thick) by an applicator (1 mi thick).
1) and dried in a dryer at 60 ° C. for 5 minutes. An ink fixing layer having a thickness of 5 μm was formed on the obtained film. The film was printed using an RI tester. The general ink is used for the ink.
It was 0.25 cc. When the ink setting time of this product was measured, it was 25 minutes.

Example 2 Vinyl chloride-vinyl acetate copolymer resin emulsion (Viniblanc 240, solid content 45%, manufactured by Nissin Chemical Industry Co., Ltd.) 80 parts Vinyl chloride-acrylic copolymer resin emulsion (Viniblanc 270, solid content 45%, manufactured by Nisshin Chemical Co., Ltd. ... 20 parts Colloidal silica (Snowtex-20L, solid content 20%, manufactured by Nissan Chemical Industries, Ltd.) ... 80 parts Water ... 100 parts of water-based paint The same film as in Example 1 was applied to the same film and dried. The resulting film has a thickness of 5μ.
m of the ink fixing layer was formed. This film has R
Printing was performed using an I tester, and the ink setting time was measured to be 15 minutes.

Example 3 A coating composed of polynorbornene resin (NOSOLEX, manufactured by Zeon Kasei Co., Ltd.): 100 parts Toluene: 100 parts was coated with a transparent polyester film (thickness: 1).
(00 μm) was applied to one side using an applicator (thickness: 3 mil) and dried with a dryer. An ink fixing layer having a thickness of 1 μm was formed on the obtained film. The film was printed using an RI tester, and the ink setting time was measured to be 5 minutes.

Comparative Example The same transparent polyester film as in the above example was printed without processing using an RI tester. When the ink setting time of this product was measured, it took 5 hours.

[0020]

The present invention is as described above. The transparent printing paper of the present invention has good ink setting properties, ink drying properties and ink fixing properties for various printings, and does not impair transparency. General properties such as heat blocking resistance, heat blocking resistance, moisture and heat blocking resistance, scratch resistance, stain resistance, and slipperiness have been significantly improved as compared with those of the prior art. It is suitable. Further, if a moldable material is used for the base film, it can be used as various packaging materials after printing.

Continuation of the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) B32B 1/00-35/00 B41M 1/30 B41M 5/00 C08J 7/04

Claims (2)

(57) [Claims] An emulsion of a vinyl chloride-vinyl acetate copolymer , colloidal silica and vinyl chloride-a on at least one surface of a substrate made of a transparent plastic film.
A transparent printing paper characterized in that an ink fixing layer is provided by applying a coating liquid containing a krill copolymer resin as a main component. 2. A transparent printing method comprising applying a coating liquid containing a polynorbornene resin as a main component to at least one surface of a substrate made of a transparent plastic film to provide a transparent ink fixing layer. Paper.