JPH0645752U - Carbonless paper for kanji printer - Google Patents

Abstract

(57) [Summary] [Purpose] When the lower paper is repeatedly used in a Kanji printer, it prevents the photosensitive plate or master from being chemically affected, and it is carbon-free when heat-fixing the transferred toner image. Prevents the generation of chemical odors and smoke from the paper below the paper,
Prevent yellowing of the acid coated surface of the lower paper. [Structure] Lower carbon paper for Kanji printer with a specific semi-synthetic solid acid coated on one side.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a carbonless paper for a kanji printer which has no trouble during printing or after printing.

[0002]

[Prior art]

 In recent years, Kanji printers have become extremely popular as a part of the growth of office automation. This is a computer-controlled image (including characters) memory that outputs (that is, prints) an image on paper by an electrophotographic method or an electrostatic image method image forming mechanism, and an electrophotographic method on a photoconductor photosensitive plate. Alternatively, an electrostatic latent image formed by an electrostatic recording method on a dielectric master is developed with toner, and the visualized toner image is transferred and fixed on a sheet to obtain an image print. It is also known as a kanji printer because it can print complex and polygraph characters such as kanji. There are dry type and wet type (also called liquid dry type) for forming a toner image, that is, development, and the toner image transferred on the paper is heated to several hundred degrees Celsius (for example, 200 to 300 degrees Celsius) and melted. It is attached (heat fixing). In the case of the wet type, not only the toner image but also the developer solvent is transferred to the sheet, so that the sheet is heated and fixed for drying. Conventionally, plain paper or slightly processed paper has been used as the paper, but recently carbonless paper has also been used. That is, it is for printing the form format with a kanji printer, and for printing and copying with an impact printer or writing.

Since various chemicals are applied to the carbonless paper as described below, the following problems frequently occur during printing on a kanji printer. 1. Since the surface of the lower sheet coated with the acid substance directly contacts the photosensitive plate or master, the photosensitive plate or master may be chemically affected after repeated use. 2. When the transferred toner image is heated and fixed, especially when it is a dry type, it is exposed to high temperatures, so odors and smoke of chemicals may be generated from the lower paper of carbonless paper, and the coated surface of the acid substance may turn yellow. There is.

[0004]

[Problems to be solved by the device]

 Therefore, the problems to be solved by the present invention are to prevent the photosensitive plate or the master from being chemically affected when the lower paper is repeatedly used in the kanji printer, and to prevent the transferred toner image from being damaged. It is intended to prevent chemical odors and smoke from being generated from the lower paper of carbonless paper during heat fixing, and to prevent yellowing of the acid substance coated surface of the lower paper.

[0005]

[Means for Solving the Problems]

As a result of careful analysis of the causes of these various troubles by the present inventors, it was found that the trouble was that the acid substance in the acid substance-coated surface (developing agent layer) of the lower paper was a phenol resin or a salicylic acid derivative. It was found to be remarkable in the case of an aromatic carboxylic acid derivative such as its metal salt or an organic substance such as its metal salt. The inventors of the present invention have conducted various experiments in search of a carbon-free paper for a Kanji printer that does not have such troubles, and as a result, use the lower paper of a carbon-free paper coated with an inorganic solid acid as a Kanji printer. And found that you can get relatively good results. Further, a clay mineral having a layered structure in which the inorganic solid acid is a tetrahedron of silica is acid-treated so as to have a SiO ₂ content of 82 to 96.5% on a dry basis (dried at 105 ° C. for 3 hours). The obtained clay mineral is contacted in an aqueous medium with a compound consisting of at least one of magnesium and aluminum which is at least partially soluble in the medium, and when the soluble compound is other than hydroxide, hydroxide is It is a semi-synthetic solid acid produced by neutralizing with an alkali or an acid so that it is formed, introducing a component consisting of at least one of magnesium and aluminum into the acid-treated clay mineral, and drying it if desired. It turns out that the best results can be obtained. Thus, the present invention was completed.

The carbonless paper for a Kanji printer of the present invention has the above-mentioned semi-synthetic solid acid coated on one side. This semi-synthetic solid acid can be produced, for example, by the semi-synthetic production method proposed in JP-A-57-15996.

A field test of the carbonless paper for a kanji printer of the present invention was carried out as a dry development method, for example, with a kanji printer “M8270 type” manufactured by Mitsubishi Electric Corp. as a wet (liquid dry type) dry development method. ) It was performed with the Toray Kanji printer "8500 System".

The carbonless paper is usually composed of upper paper, middle paper and lower paper. In the present invention, the lower sheet processed by the Kanji printer can be combined with at least one of the upper sheet and the middle sheet of a known carbonless sheet for copying.

[0009]

【Example】

 Specific examples of the present invention are shown below, but the present invention is not limited to these.

Examples and Comparative Examples Preparation of color developer coating liquid

Color developer coating liquid (A) 100 parts of a semi-synthetic solid acid (trade name Shilton SS-1, manufactured by Mizusawa Chemical Co., Ltd.) and calcium carbonate (trade name) in 180 parts of an aqueous solution in which 1 part of sodium hexametaphosphate is dissolved. 20 parts of PC, manufactured by Shiraishi Industry Co., Ltd.) were dispersed, and 50 parts of 10% aqueous solution of oxidized starch and 50 parts of 48% SBR latex were added thereto to prepare a developer coating solution (A).

Color developer coating liquid (B): 160 parts of an aqueous solution containing 2 parts of sodium hexametaphosphate was mixed with 20 parts of 10% aqueous polyvinyl alcohol solution, and 100 parts of activated clay was dispersed in the aqueous solution. 20 parts of SBR latex was added to prepare a developer coating liquid (B).

Color developer coating liquid (C) Kaolin (Ultra White 90, manufactured by Engelhard Co., Ltd.) 50 parts, calcium carbonate (trade name PC, Shiraishi Industrial Co., Ltd.) in 100 parts of an aqueous solution in which 0.5 part of sodium hexametaphosphate is dissolved. After dispersing 50 parts of the company), 50 parts of 10% phosphoric esterified starch (trade name MS-4600, manufactured by Nippon Food Processing Co., Ltd.), 20% of 48% SBR latex and paraphenylphenol resin were added to the dispersion. A developer coating liquid (C) was prepared by adding 30 parts of the dispersion liquid.

Using the above-mentioned developer coating liquids (A), (B) and (C), a lower carbonless paper having a dry weight of the developer layer of 7 g / m ² is obtained. It was The carbonless under paper is superposed so that the color developer layer contacts the smooth aluminum plate, and the iron heated to about 200 ° C is pressed for about 3 seconds on the surface of the lower paper on which the color developer layer is not provided, At that time, the presence or absence of odor generated from each lower paper, the ease of peeling each lower paper from the aluminum plate, and the degree of yellowing of the developer layer after peeling were compared. The results are shown in Table 1.

[0015]

[Table 1]

[0016]

[Effect of device]

 When the lower sheet of the present invention is used for a Kanji printer, the photosensitive plate or the master is not chemically affected when it is repeatedly used for the Kanji printer, and no heat is generated when fixing the transferred toner image. It is possible to prevent chemical odors and smoke from being generated from the lower paper of the carbon paper, and further to prevent yellowing of the acid substance coated surface of the lower paper, that is, the developer layer. Therefore, it is possible to print without problems, and further, it has a good copying performance even in the original use of carbonless paper by a typewriter or writing after printing. However, the commercially available conventional carbonless paper used for comparison, that is, the lower paper using the zinc salt of phenolic resin or salicylic acid derivative as the developer (acid substance), when the toner image is heat-fixed, especially in the dry type, Odor and smoke were generated from the lower paper.

[Brief description of drawings]

FIG. 1 is a schematic cross-sectional view showing an example of the constitution of the lower paper of carbonless paper for Kanji printer of the present invention. 1 in FIG.
Is a lower paper, 2 is a base paper, and 3 is a semi-synthetic solid acid coating layer.

Claims (1)

[Scope of utility model registration request] 1. A clay mineral having a layered structure consisting of tetrahedron of silica is dried on a dry basis (dried at 105 ° C. for 3 hours).
Acid treatment to obtain an O ₂ content of 82 to 96.5%, and contacting the resulting clay mineral with a compound of at least one of magnesium and aluminum which is at least partially soluble in the medium, When the soluble compound is other than hydroxide, it is neutralized with an alkali or an acid so that a hydroxide is formed, and a component composed of at least one of magnesium and aluminum is introduced into the acid-treated clay mineral, Carbon-free paper for Kanji printers, coated on one side with a semi-synthetic solid acid produced by drying.