JP2565335B2 - Manufacturing method of magnetic thermosensitive recording paper - Google Patents

Description

The present invention relates to a method for producing a magnetic thermosensitive recording paper. In particular, a method for producing a magnetic thermosensitive recording paper, which has excellent concealing property and smoothness on the surface of a magnetic recording layer provided with a stripe-shaped magnetic recording layer and can print visible information directly on the concealing layer formed on the surface of the magnetic recording layer. It is intended to provide.

The magnetic thermosensitive recording paper provided with the stripe-shaped magnetic recording layer has a dark brown and dark black color tone due to the magnetic powder,
Visible information cannot be printed on the striped magnetic recording layer, and there is a restriction on the incorporation of visible information on the magnetic recording layer surface. Further, due to the stripe-shaped magnetic recording layer, space loss occurs due to contact with the magnetic head, and there is a demand for magnetic thermosensitive recording paper with good smoothness.

The present invention has examined the possibility of recording visible information on the surface of a magnetic recording layer having a stripe shape. As a result, the magnetic recording layer can be formed by simply providing an aluminum coating layer and a white pigment coating layer having a relatively small coating amount. It was discovered that it was possible to hide the dark brown color, at the same time it had excellent smoothness, did not hinder the magnetic properties at all, and that it did not hinder the ticket issuing test assuming an automatic vending machine.

That is, the present invention, one surface of the base paper, a color-forming leuco dye, a color-developing agent for coloring the color-forming leuco dye when heated and a heat-sensitive paint containing an adhesive as a main component are coated, dried and heat-sensitive. A recording layer is provided, and the other surface of the raw paper is coated with a magnetic coating material containing magnetic powder and an adhesive as main components in a stripe shape and dried to form a stripe-shaped magnetic recording layer. On the magnetic recording layer, a water-based aluminum paint containing aluminum powder and an adhesive as main components is coated and dried to form an aluminum coating layer, and a white pigment and an adhesive are further provided on the aluminum coating layer. A method for producing a magnetic thermosensitive recording paper, which comprises coating a water-based white pigment paint containing, as a main component, and drying to provide a white pigment coating layer having a whiteness of 73% or more.

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

First, as the base paper, high-quality paper having a basis weight of 40 to 300 g / m ² and processed base paper can be used, but the base paper is not particularly limited.

The striped magnetic recording layer provided on the base paper is provided by a thermal transfer film system, a printing system, a coating system or the like. A coating method using a magnetic paint will be described below as an example. That is, it is possible to use γ-iron oxide, γ-iron oxide modified with cobalt, chrome oxide, barium ferrite, and the like, which are composed mainly of a magnetic powder and an adhesive agent. As the adhesive, a water-soluble adhesive such as polyvinyl alcohol, a styrene / butadiene copolymer, a methylmethacrylate / butadiene copolymer, a styrene / butadiene / methylmethacrylate copolymer, an acrylic resin, acetic acid A latex emulsion such as a vinyl resin, a polyurethane resin, a vinyl chloride resin, a polyester resin or the like can be used. The magnetic paint containing the magnetic powder and the adhesive as main components is 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 or the like can be used.

The magnetic coating material thus prepared is applied on a base paper in a stripe shape by a roll coater, a gravure coater, a comma coater, a die coater, a knife coater or the like and dried to form a stripe-shaped magnetic recording layer. The stripes of the magnetic recording layer are 4 to 20 mm wide and are provided at appropriate intervals.

In the present invention, on the magnetic recording layer surface provided with the stripe-shaped magnetic recording layer, first, a water-based aluminum paint containing aluminum powder and an adhesive as main components is coated and dried to form an aluminum coating layer. To provide.

The aluminum powder used in the water-based aluminum paint prepared when the aluminum coating layer is provided on the magnetic recording layer surface is easily oxidized and easily loses its metallic luster, so an aluminum paste pigment processed into a paste is used. To be done. The aluminum paste pigment includes a leafing type and a non-leafing type, and any of them can be used in the present invention. Its composition is usually processed into an arbitrary particle size by a crusher such as a ball mill together with an aluminum foil and additives such as stearic acid and mineral spirits.

The water-based aluminum paint of the present invention contains such an aluminum paste pigment and an adhesive as main components, and an additive or a paint conditioner or the like is added thereto. Examples of the adhesive include water-soluble adhesives such as casein, starch, gelatin, soy protein, and polyvinyl alcohol, styrene / butadiene copolymer, styrene / butadiene / methyl methacrylate copolymer, acrylic resin, vinyl acetate resin, and polyester. A latex emulsion of a resin or the like or a synthetic resin emulsion can be used.

As additives, thickeners, dispersants, defoamers, lubricants, colorants, etc. used in general water-based pigment coatings for clay coating can be used, and any of them can be used as needed. Good.

It is important to adjust the pH of a water-based aluminum coating composed of an aluminum paste coating, an adhesive, and other additives to be neutral to 7. However, when it becomes acidic or alkaline, it can be used even if it does not become neutral if emulsions are added after forming protective colloid by adding polyvinyl alcohol or casein.

The water-based aluminum paint mainly containing such an aluminum paste pigment and an adhesive is prepared by sufficiently dispersing it in various mixers that are usually used in the water-based paper coating method. At that time, a dispersant, a lubricant, a colorant, a water-proofing agent, a defoaming agent, a paint viscosity modifier, and the like may be appropriately added as additives.

The thus-prepared water-based aluminum coating composition is applied to the magnetic recording layer provided on the base paper with an air knife coater, a blade coater, a roll coater, a gravure coater or the like and dried to form an aluminum coating layer. The aluminum coating layer is required not to deteriorate the magnetic characteristics of the magnetic recording layer, and the amount of the water-based aluminum coating is 2 to 10 g /
At m ² , preferably 3 to 8 g / m ² , no deterioration of magnetic properties was observed. Particularly, in the case of the aluminum coating layer of the present invention, the brown color of the magnetic recording layer can be covered with a relatively small coating amount.

Further, in the present invention, a white pigment coating layer having a whiteness of 73% or more is provided on the aluminum coating layer by coating a water-based white pigment paint containing a white pigment and an adhesive as main components and drying. Thus, the hiding property and smoothness are excellent, and printing can be performed on the magnetic recording layer surface.

On the aluminum coating layer, as the pigment to be provided in the aqueous white pigment coating material prepared in providing the white pigment coating layer,
Clay, calcium carbonate, aluminum hydroxide, barium sulphate, satin white, zinc white, alumina zeolite, plastic pigments and the like usually used for coating paper may be used. On the other hand, as adhesives, water-soluble adhesives such as casein, starch, gelatin, soybean protein, and polyvinyl alcohol, styrene / butadiene copolymers, styrene / butadiene / methyl methacrylate copolymers, acrylic resins, vinyl acetate A latex emulsion of a resin or a polyester resin or a synthetic resin emulsion can be used.

The water-based white pigment paint containing such a white pigment and an adhesive as main components is prepared by sufficiently stirring and dispersing with various mixers that are usually used in the water-based paper coating method. At this time, a dispersing agent, a lubricant, a coloring agent, a water-proofing agent, an antifoaming agent, a paint viscosity adjusting agent and the like may be appropriately compounded as auxiliary agents.

The thus-prepared aqueous white pigment coating composition is coated on the aluminum coating layer with an air knife coater, blade coater, roll coater, gravure coater, etc. and dried to form a white pigment coating layer. Further, when the white pigment coating layer is treated with a super calender, a gloss calender or the like in order to smooth it, the printability can be further improved, which is effective.

The white pigment coating layer is required not to deteriorate the magnetic characteristics of the magnetic recording layer, and the coating amount of the aqueous white pigment coating material can be reduced by the synergistic effect with the aluminum coating layer. -8 g / m ² , preferably 3-7 g / m ² is sufficient to obtain the effect.

On the local surface of the base paper thus provided with the magnetic recording layer, the aluminum coating layer and the white pigment coating layer, a chromogenic leuco dye, a developer and an adhesive agent for colouring the chromogenic leuco dye under heat. A magnetic thermosensitive recording paper can be obtained by applying a thermosensitive coating containing as a main component and drying to provide a thermosensitive recording layer by the method for producing a magnetic thermosensitive recording paper of the present invention. As the color-forming leuco dye, developer and adhesive for the heat-sensitive recording layer, those generally used in the production of heat-sensitive recording paper can be appropriately selected and applied. The same applies to other auxiliaries in preparing the heat-sensitive paint. Then, a protective layer may be provided on the heat-sensitive recording layer as necessary to impart plasticizer resistance, chemical resistance, etc., so that a certain effect can be exhibited.

The method for producing a magnetic thermosensitive recording paper of the present invention provides a magnetic recording layer in a stripe shape, whereby an expensive magnetic coating material is applied only to a necessary portion for magnetic recording to reduce the cost. By providing a small amount of aluminum coating layer and a small amount of white pigment coating layer on the striped magnetic recording layer in layers, the magnetic recording layer has a dark brown or dark black hue. And the visibility of the surface of the magnetic recording layer is 73% or more, and visible information is printed with the printing ink used for printing on ordinary paper without using special printing ink on the magnetic recording layer. And the amount of recorded information can be increased. Moreover, the smoothness of the magnetic recording layer surface is improved by the aluminum coating layer and the white pigment coating layer, there is no space loss with the magnetic head, the magnetic output characteristics are not affected at all, and the magnetic thermal recording paper is suitable for ticketing. Can be obtained.

 Further, the present invention will be described with reference to examples.

Example 1 Magnetic coating compound composition by weight γ-iron oxide 100 Polyvinyl alcohol 30 Styrene-butadiene latex 20 Melamine-formaldehyde resin 5 Water-based aluminum coating composition composition by weight Aluminum paste AW-600 (non-leafing type) 100 Polyvinyl alcohol 20 Styrene Butadiene latex 50 Dispersant 3 Aqueous white pigment coating composition weight part Titanium oxide 100 Sodium tripolyphosphate 0.3 Oxidized starch 10 Carboxy-modified methylmethacrylate butadiene latex 20 Aqueous magnetic coating composition was prepared with the above magnetic coating composition and basis weight.
A 157 g / m ² processed base paper was applied in a stripe shape with a width of 6.5 mm and an interval of 54 mm, oriented with a permanent magnet and dried to provide a stripe-shaped magnetic recording layer. Next, an aqueous aluminum coating composition having the above-mentioned aqueous aluminum coating composition was prepared, coated on the magnetic recording layer and dried to provide an aluminum coating layer having a coating amount of 3 g / m ² . Furthermore,
The above aqueous white coating material was prepared, coated on an aluminum coating layer and dried to form a white pigment coating layer having a coating amount of 5 g / m ² .

Subsequently, a heat-sensitive paint was prepared with the following composition, coated on the other surface of the base paper, and a heat-sensitive recording layer having a coating amount of 8 g / m ² was provided,
Further, a protective layer having a coating amount of 2 g / m ² was provided on the thermosensitive recording layer to obtain a magnetic thermosensitive recording paper by the method for producing a magnetic thermosensitive recording paper of the present invention.

Heat-sensitive coating composition A liquid (15%) parts by weight Chromogenic leuco dye (PSD-150 manufactured by Shin Nisso Co., Ltd.) 30 Polyvinyl alcohol (5% aqueous solution) 400 Calcium carbonate 20 B liquid (10%) parts by weight Bisphenol A 20 Stearin Acid 5 Polyvinyl alcohol (5% aqueous solution) 400 Liquid A and liquid B were stirred and dispersed with an attritor for 5 hours and mixed at the following ratios to prepare a heat-sensitive paint.

Mixing ratio by weight A liquid 20 B liquid 100 Polyvinyl alcohol (5% aqueous solution) 10 Melanin / formaldehyde resin 1 Protective layer formulation composition By weight Polyvinyl alcohol (5% aqueous solution) 10 Melanine / formaldehyde resin 1 Example 2 Aqueous aluminum paint formulation except for changing the composition below, in the same manner as in example 1, the aluminum coating layer and a coverage of laydown 5 g / m ² is provided with a white pigment coated layer of 2 g / m ^2, the magnetic of the present invention A magnetic thermosensitive recording paper was obtained by the method for producing a thermosensitive recording paper.

Composition of water-based aluminum paint Part by weight Aluminum paste 0500M (leafing type) 100 Dispersant 3 Casein 10 Ammonia 1 Carboxy-modified methylmethacrylate-butadiene latex 60 Example 3 Same as Example 1, the following water-based aluminum coating composition and aqueous solution aluminum coated layer and the coated amount of laydown white pigment composition 3 g / m ² is provided with a white pigment coated layer of 5 g / m ^2, a magnetic thermosensitive recording by the manufacturing method of the magnetic thermosensitive recording paper of the present invention Got the paper.

Aqueous aluminum paint blending composition by weight Aluminum paste AW-100 (non-leafing type) 100 Dispersant 5 Polyvinyl alcohol 3 Ammonia 1 Sorpress acrylic emulsion 60 Aqueous white pigment paint blending composition By weight Kaolin 75 Calcium carbonate 25 Sodium tripolyphosphate 0.3 Casein 7 Ammonia 0.7 Styrene-Butadiene Latex 16 Comparative Example 1 In Example 1, a magnetic thermosensitive recording paper provided with only a magnetic recording layer, an aluminum coating layer, a thermosensitive recording layer and a protective layer was used for comparison.

Comparative Example 2 In Example 1, a magnetic thermosensitive recording paper provided with only a magnetic recording layer, a thermosensitive recording layer, and a protective layer was used for comparison.

A quality test was performed on the magnetic thermosensitive recording paper obtained in each of the examples and comparative examples. The results of the quality test are shown in the following table.The magnetic thermosensitive recording paper according to the method for producing a magnetic thermosensitive recording paper of the present invention has magnetic properties even if an aluminum coating layer and a white pigment coating layer are provided on the magnetic recording layer surface. It was possible to obtain a magnetic recording layer surface having a high whiteness of 73% or more with an excellent hiding property without impairing the above, and to impart printability.
It can be seen that there is no problem in ticketing aptitude and the magnetic thermosensitive recording paper according to the method for producing the magnetic thermosensitive recording paper of the present invention is satisfactory.

Claims (1)

(57) [Claims] 1. A thermosensitive recording comprising a color-forming leuco dye, a color-developing agent which develops the color of the color-forming leuco dye when heated, and an adhesive as a main component, which is dried on one side of a base paper. A layer is provided, and on the other surface of the base paper, a magnetic coating material containing magnetic powder and an adhesive as main components is applied in a stripe shape and dried to form a stripe-shaped magnetic recording layer. On the recording layer, a water-based aluminum paint containing aluminum powder and an adhesive as main components is coated and dried to form an aluminum coating layer, and a white pigment and an adhesive are further provided on the aluminum coating layer. A method for producing a magnetic thermosensitive recording paper, which comprises applying a water-based white pigment paint containing as a main component and drying to provide a white completed coating layer having a whiteness of 73% or more.