JPS6299919A - Magnetic recording paper - Google Patents

Abstract

PURPOSE:To obtain magnetic recording paper which is printable on a magnetic recording layer by providing a pigment coating layer essentially consisting of a pigment and adhesive agent on the magnetic recording layer. CONSTITUTION:A magnetic coating compd. essentially consisting of magnetic the magnetic recording layer, then an aq. pigment coating compd. essentially consisting of the pigment and adhesive agent is coated on the magnetic recording layer to provide the pigment coating layer. The aq. pigment coating compd. for which the pigment and adhesive agent are used is prepd. by thoroughly dispersing the pigment and adhesive agent with a mixer and is coated by an air knife coater, blade coater, roll coater, gravure coater, etc., on the magnetic recording layer provided on the raw paper and is dried. The printing on the magnetic recording layer is thereby made possible and the amt. of the information to be recorded is increased; in addition, the magnetic characteristics of the magnetic recording layer are not affected at all.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to magnetic recording paper. In particular, the object is to provide a magnetic recording paper whose magnetic recording layer can be printed.

Conventionally, magnetic recording paper in which a magnetic recording layer is provided on a base paper has been widely used for magnetic tickets such as train tickets and commuter passes, parking tickets, expressway passes, and the like.

In recent years, it has also come to be used for various types of cards. This is the size of the information storage capacity of the magnetic recording layer,
This is probably because the rlrJ function and accuracy of reading the written information made it possible to process it in a vending machine, saving labor. Other necessary visible information can be obtained using a carbon thermal transfer method on the side opposite to the magnetic recording layer, or a chelate printing method with a chelate layer, heat-sensitive recording layer, etc. on the back side.
The heat-sensitive recording layer and the like are printed using a chelate printing method, a heat-sensitive recording method, etc., and conventionally, no consideration has been given to printing on the magnetic recording layer, resulting in a 1F51C.

As a result of testing the possibility of printing on the magnetic recording layer, the present invention found that even if a water-based pigment coating layer is provided, the magnetic recording characteristics are not affected in any way. It was completed after finding that there was no problem with this.

That is, in the present invention, a magnetic coating material mainly composed of magnetic powder and an adhesive is coated on a base paper, a magnetic recording layer is provided, and then a magnetic coating material mainly composed of a pigment and an adhesive is coated on the magnetic recording layer. This magnetic recording paper is coated with an aqueous pigment coating of the same type as the above, and is coated with a pigment coating layer.

Hereinafter, technical matters of the present invention will be explained in detail.

First, as the base paper, high-quality paper of 40 to 5009/-, processed base paper, etc. can be used, but there is no particular limitation.

The magnetic recording layer provided on the base paper contains magnetic powder and adhesive as main components, and as the magnetic powder, iron oxide, r-iron oxide modified with cobalt, chromium oxide, etc. can be used. In addition, adhesives include water-soluble adhesives such as polyvinyl alcohol, styrene-butadiene copolymers, methyl methacrylate-butadiene copolymers,
Latex emulsion resins such as styrene-butadiene-methyl methacrylate copolymer, acrylic resin, vinyl acetate resin, polyurethane resin, vinyl chloride resin, polyester resin, etc. can be used. Magnetic paints containing these magnetic powders and adhesives as main components are prepared and provided in either an aqueous system or an organic solvent system, but an aqueous system is more economical and preferable. As the organic solvent, toluene, xylene, butanol, etc. can be used.

The magnetic paint thus prepared is coated on base paper using a knife coater or the like to form a magnetic recording layer.

In the present invention, a water-based pigment paint containing pigment and adhesive as main components is coated on the magnetic recording layer provided on the base paper.
2. It is characterized by providing a pigment coating layer to impart printability.

Pigments used in the aqueous pigment paint prepared for forming the magnetic recording layer include clay, calcium carbonate, aluminum hydroxide, barium sulfate, satin white, zinc white, alumina zeolite, Any material commonly used for coating paper, such as plastic pigments, may be used. On the other hand, adhesives include casein, starch, gelatin, soybean protein, water bath adhesives such as polyvinyl alcohol, styrene-butadiene copolymers,
Latex emulgene or synthetic resin emulgene such as styrene-butadiene-methyl methacrylate copolymer, acrylic steel, vinyl acetate resin, polyester resin, etc. can be used.

Water-based pigment paints using such pigments and adhesives are
It is prepared by dispersing it under sufficient pressure using various mixers commonly used in aqueous paper coating methods. At that time, auxiliary agents such as dispersants, lubricants, colorants, waterproofing agents, antifoaming agents,
A paint viscosity modifier and the like can be appropriately blended.

The aqueous pigment coating thus prepared is coated onto the magnetic recording layer provided on the base paper using an air knife coater, blade footer, roll coater, gravure coater, etc. and dried to provide the pigment coating If4.

Furthermore, in order to smoothen the pigment coating layer, gloss calendering or super calendering treatment can further improve printability and is effective. The pigment coating layer must not reduce the magnetic properties of the magnetic recording layer, and the amount of water-based pigment coating cannot be increased too much. The coating amount is 4-801/Ill', good tL, <8-fpO? /d, no deterioration in magnetic properties was observed at all.

Since the magnetic recording paper of the present invention is provided with a VC pigment coating layer on the magnetic recording layer, the coloring of the magnetic recording layer of conventional products can be hidden, and a beautiful appearance can be obtained. In addition, it is possible to obtain magnetic recording paper that can print on the magnetic recording layer and increase the amount of recorded information, and that has no effect on the magnetic properties of the magnetic recording layer and is suitable for ticketing. I can do it.

Further, the present invention will be explained by examples.

Example: Magnetic paint composition (parts by weight) Water-based pigment paint composition (parts by weight) A water-based magnetic paint was prepared using the above magnetic paint composition, and the basis weight was 1.
57? /d processed base paper, blended with a permanent magnet and dried to provide a magnetic recording layer with a coating weight of 40 f/d.

Next, a water-based pigment paint having the above-mentioned water-based pigment paint composition was prepared and coated on the magnetic recording layer to form a pigment coating layer with a coating amount of 6 tel to obtain the magnetic recording paper of the present invention.

Example 2 A magnetic recording paper of the present invention was obtained by applying a pigment coating layer with a coating amount of 2 oyii by applying pressure in the same manner as in Example t.

Example 5 Apply pressure and apply two coats in the same way as Example t, and the coating amount is 40~7.
A pigment coating layer of No. 1 was provided to obtain a magnetic recording paper of the present invention.

Example 4, Example 1. Apply 2 coats in the same way as above, the coating amount is 602/
A pigment coating layer of I/ was provided to obtain a magnetic recording paper of the present invention.

Comparative Example A magnetic recording paper in which only the magnetic recording J- was provided in Example t was used for comparison.

A quality test was conducted on the magnetic recording paper obtained in each Example and Comparative Example. The results of the quality tests are shown in the following table.The magnetic recording paper of the present invention shows that even if a [111i coating layer is provided on the magnetic recording layer, the magnetic properties are not impaired at all, and printing on the magnetic recording layer is not possible with conventional methods. By using ink for general paper, we were able to give it the same printability as ordinary paper. and,
There is no problem with ticketing suitability.

It can be seen that the magnetic recording paper of the present invention is satisfactory.

Test results

Claims (1)

[Claims] A magnetic paint containing magnetic powder and adhesive as main components is coated on the base paper to form a magnetic recording layer, and then a water-based pigment paint containing pigment and adhesive as main components is applied on the magnetic recording layer. Magnetic recording paper coated with a pigment coating layer.