JPH01257042A - Printing sheet - Google Patents

Abstract

PURPOSE:To obtain a printing sheet which is superior in printing characteristics, especially conveying properties and unnecessary to stick to a mount by a method wherein an antistatic layer is provided at least on one side of a substrate body and a surface layer containing n-butyl methacrylate resin for its main ingredient is provided on the antistatic layer. CONSTITUTION:A printing sheet is comprised by providing an antistatic layer at least on one side of a substrate and a surface layer containing n-butyl methacrylate resin for its main ingredient on the antistatic layer. A sheetlike matter to which the antistatic layer can be provided and a various thermoplastic resin film such as paper, synthetic paper, polyester and polyvinyl chloride can be used as the substrate. The antistatic layer is constituted so that it becomes a, low-resistant layer whose surface intrinsic resistance is 10<12>OMEGA or less, for example, the antistatic layer of phosphoric ester and quaternary ammonium salt and a conductive material containing a metallic material of Al, Cu, Fe and carbon black can be used. It is necessary that the surface layer contains at least 30wt.% n-butyl methacrylate resin and when it becomes lower than 30wt.% an improvement effect in printing characteristics becomes not obtainable.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a printing sheet with excellent printing properties such as ink drying properties, transportability, and prevention of blocking, and particularly to a printing sheet suitable for offset printing.

BACKGROUND OF THE INVENTION In recent years, with the diversification of printing, printing on a wide variety of media such as paper, synthetic paper, thermoplastic resin film, metal foil, metal-deposited sheets, etc. is desired, and offset printing, gravure printing 7j , flexographic printing, screen printing,
Printing methods such as letterpress printing are used. Among these printing methods, offset printing is easy to make,
Because of its low cost and beautiful finish,
There is a strong demand for offset printing on various media, and sheets and films suitable for offset printing have been developed.

Printing properties required for sheets for offset printing include transportability, anti-blocking properties, ink sludge properties, ink adhesion properties, and antistatic properties, and the sheet itself must satisfy these printing properties. For example, in polyester film, in order to improve ink drying properties, the sheet surface is treated to give it offset printing characteristics.
Methods of applying paint containing inorganic pigments to the surface or applying corona discharge treatment to the surface to improve ink adhesion are employed. In addition, sheet plain wood is also formed by copolymers with other polar monomers or by blending polymers of polar monomers. In order to prevent static electricity, methods such as kneading an antistatic agent into a resin and forming it into a film, or coating the surface of the film with an antistatic agent, etc., have been adopted.

Furthermore, some sheets are used by attaching a mount to the back surface of the sheet to cover defects such as ink set-off due to poor conveyance and blocking.

Problems to be Solved by the Invention However, when the sheet surface is treated as described above,
Alternatively, if the sheet itself is formed by selecting a specific material to give it offset printing characteristics or to prevent static electricity, it is not possible to obtain a sheet that satisfies all of the above printing characteristics necessary for an offset printing sheet. The reality is that there is no such thing. In addition, in order to compensate for this, if a mount is attached to the back of the sheet, the offset printing characteristics are satisfied, but there are problems such as the mount attachment process during the production of the printing sheet, the mount peeling process after printing, the mount cost, etc. This method has problems in terms of workability and economy.

The present invention has been made in consideration of the above-mentioned problems in the conventional technology.

An object of the present invention is to provide a printing sheet that has all the characteristics necessary for the above-mentioned printing sheet and also eliminates the problems caused by bonding a mount. That is, an object of the present invention is to provide a printing sheet that has excellent printing properties and particularly excellent transportability, and does not require a mount.

Means and Effects for Solving the Problems The inventors of the present invention have conducted various studies on printing sheets that satisfy the above-mentioned printing characteristics. However, as a result of further study, it was discovered that conveyance properties could be improved by providing an antistatic layer, leading to the completion of the present invention.

That is, the printing sheet of the present invention is characterized in that an antistatic layer is provided on at least one side of a support, and a surface layer containing n-butyl methacrylate resin as a main component is provided on the antistatic layer. do.

The support used in the printing sheet of the present invention is not particularly limited as long as it can be provided with an antistatic layer, and examples include paper, synthetic paper, nonwoven fabric, polyester, and Various thermoplastic resin films such as density polyethylene and polyvinyl chloride can be used.

An antistatic layer is provided on at least one side of the support. The antistatic layer may be made of any material as long as it becomes a low resistance layer with a surface resistivity of 1012Ω or less. Inhibitor, AI, Cu,
Metal materials such as Fe, conductive materials containing carbon black, etc. can be used.

Various methods can be used to form the antistatic layer. For example, when an antistatic agent is used, a paint containing the antistatic agent may be coated on the support. When using metal or other conductive material, a method of laminating a sheet, foil, or the like of the conductive material on the support can be used. Alternatively, a method of vapor depositing aluminum or other metal material onto the support can also be used.

The thickness of the antistatic layer varies depending on the material used.
It is usually preferable to set the thickness in the range of 1 to 10 μm.

A surface layer containing n-butyl methacrylate resin as a main component is provided on the antistatic layer. As the n-butyl methacrylate resin, in addition to a homopolymer of n-butyl methacrylate, copolymers of n-butyl methacrylate and acrylic, methacrylic, styrene, and other vinyl-based monomers may also be used. can. In the case of a copolymer, the copolymerization ratio of n-butyl methacrylate is 30
It is necessary that the weight is 1% or more. These resins are
It can be produced by a conventionally known polymerization method, and when forming a surface layer on a support, the solubility in a solvent or heat meltability, etc., or the band @ prevention layer or surface formed on a support. The selection may be made as appropriate, taking into consideration the matching properties with the chemicals added to the layer.

The surface layer contains the above-mentioned n-butyl methacrylate-based FA fat as a main component, and if necessary, for example,
For the purpose of improving conveyance and blocking properties, resins can be blended or various additives can be added. In that case, in order to achieve the object of the present invention, it is necessary that the surface layer contains 30% by weight or more of n-butyl methacrylate resin. When the content of the n-butyl methacrylate resin is lower than 30% by weight, the above-mentioned effect of improving printing properties cannot be obtained.

As the resin to be blended as necessary, resins having good compatibility with the above n-butyl methacrylate resin, such as Ike's acrylic and methacrylic resins, polyester resins, and silicone resins, can be used as appropriate. or,
Examples of additives include polyethylene oxide, silica, clay, talc, diatomaceous earth, calcium carbonate, H
D-calcium, barium sulfate, aluminum silicate, synthetic zeolite, alumina, zinc oxide, lithopone, satin white, etc. can be used.

This surface layer can be formed by dissolving or dispersing the n-butyl methacrylate resin and resins or additives added as necessary in a solvent, applying the resulting paint onto a support, and drying it. can. Alternatively, a mixture of the n-butyl methacrylate resin and optionally added resins or additives may be laminated onto a support by melt extrusion.

The thickness of the surface layer is usually in the range of 1 to 10 a+, especially 2 to 5
It is preferable to set the film thickness within the range of -.In order to fully exhibit the effect, the film thickness should be 2H1 or more, but it is 5 μm.
If the temperature is higher than that, the effect will not be much improved and the cost will increase due to drying and other manufacturing problems.

The printing sheet of the present invention is particularly suitable for offset printing, but also has good printability for printing methods such as gravure printing, flexo printing, screen printing, and letterpress printing.

In that case, the factors that actually affect the running stability of the printing material on the printing press include the slipperiness of the printing material itself < I
The major factors include the number of scratches) and the presence or absence of static electricity.

Among these, the problem of static electricity generation is particularly important, and is thought to cause not only running stability on the printing press, but also deterioration of loading performance in paper feeding and paper ejection sections, misting, etc. By providing the printing sheet with an antistatic layer, it is possible to eliminate these problems caused by static electricity.

EXAMPLES Hereinafter, the present invention will be explained by examples. In addition, “department”
all mean "parts by weight".

Example 1 On a polyethylene terephthalate film (PET100G, manufactured by Fuji Film ■) with a thickness of 100 μm, an antistatic layer paint consisting of the following composition (■) was applied (application thickness: 1 μm).
After drying, a surface layer paint having the following composition (1) is applied and dried to form a surface layer with a thickness of 3 μm to obtain a printing sheet.

Composition ■ Acrylic resin antistatic agent 10 parts (Colcoat NR3121, manufactured by Colcoat ■) Methanol 30 parts Composition ■ N-butyl methacrylate resin 10 parts (degree of polymerization 2000, solid content 40%, manufactured by Fujikura Kaseikan) Silica (Fine Seal X-370, 01 part Tokuyama Soda■
Example 2 A printing sheet was obtained in exactly the same manner as in Example 1, except that a polysiloxane antistatic agent (Antistat C83900, manufactured by Toshiba ■) was used as the coating for the antistatic layer. Ta.

Example 3 As a support, a 75 μm thick polyethylene terephthalate film laminated with a 10-thick aluminum foil was used, and a surface layer paint consisting of the composition ① of Example 1 was applied onto the aluminum foil. A surface layer having a thickness of 3 am was formed by drying to obtain a printing sheet.

Comparative Example A surface layer paint having the following composition was applied on a polyethylene terephthalate film (PET100G, manufactured by Fuji Film ■) with a thickness of ioon, dried to form a surface layer with a thickness of 3, and a printing sheet was prepared. Obtained.

Acrylic resin 10 parts (H-2
000, produced by Soken Kagaku@) 10 parts toluene
A printing test was carried out on 10,000 sheets of each sample, and the ink receptivity, ink drying properties, transportability and running stability were evaluated. The results are shown in Table 1.

Table 1 The evaluation method for each item in Table 1 is as follows.

Those with good ink receptivity by two-sight judgment were rated as O5, and those with poor O5 were rated as ×.

Ink drying property: After being left for 1 hour after printing, the ink was rubbed with a finger and a good score was rated as ○, while a poor score was rated as ×.

Conveyance/Running Stability: When printing continuously with a printing machine, there are many failures such as two-sheet feeding, jamming, uneven loading, etc., which are not practical.
And so.

Effects of the Invention Since the printing sheet of the present invention has the above structure, it has excellent printability for various forms of printing that fully satisfy the needs for diversification of printing, and has excellent ink receptivity. It has excellent printing properties such as ink drying properties, transportability, and prevention of blocking. Furthermore, since the printing sheet of the present invention has particularly excellent ink drying properties and transportability, it exhibits good printing characteristics without the need for bonding a backing paper, which is conventionally required during offset printing. This has the advantage of eliminating disadvantages in terms of workability and economy due to the use of mounts. Therefore, the printing sheet of the present invention is particularly suitable for offset printing.

Patent applicant Tomogawa Paper Mills Co., Ltd. Agent: Patent Attorney Tsuyoshi Liquidbe

Claims (1)

[Claims] (1) A printing sheet comprising an antistatic layer provided on at least one side of a support, and a surface layer containing n-butyl methacrylate resin as a main component on the antistatic layer.