JPH07186525A - Pressure-sensitive recording material and image forming and reading method - Google Patents

Abstract

PURPOSE:To form a developed color image having necessary developed color density from an upper sheet to a lower sheet by providing a color self- developing type pressure-sensitive sheet having microcapsules including an electron donating color former and a color self-developing layer provided thereto and a self-supporting plastic transparent sheet to the upper surface of a support. CONSTITUTION:When a developed color image is formed on color self-developing type pressure-sensitive sheets 20, a pressure printer is used and an ink ribbon is not used to apply printing to a plastic transparent sheet 30 in the direction shown by an arrow By this pressure printing, the microcapsules of the color forming layers 22 of both color self-developing type pressure-sensitive sheets 20 are dustructed. Accompanied by this, the color former included in the microcapsules is reacted with the coupler of coupler layers 23 to develop a color to form developed color images 40. At the time of this printing, the developed color images 40 are not substantially transferred to the plastic transparent sheet 30 and transparency is kept.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is a water resistant type which can print a bar code or characters for OCR reading under pressure without using an ink ribbon and can be read as it is by using an optical reading device. The present invention relates to a pressure-sensitive recording material having excellent properties and an image forming / reading method.

[0002]

2. Description of the Related Art A color former layer (hereinafter sometimes referred to as "color former layer") comprising microcapsules containing an electron-donating color former (hereinafter sometimes referred to as "color former"),
A color developer and a color developer are brought into contact with a color developer layer containing an electron-accepting color developer (hereinafter sometimes referred to as “color developer”), and pressure is applied to the layer to break the microcapsules. A pressure-sensitive recording sheet utilizing formation of a color image by reacting with has been known for a long time and is widely used.

In general, a pressure-sensitive recording sheet is composed of an upper paper having a color former layer provided on one side of a paper support, a lower paper having a color developer layer provided on one side of the paper support, and a paper support. Is it made of middle paper with a color developer layer on one surface and a developer layer on the opposite surface, and whether the upper paper and the lower paper are stacked so that the color developer layer and the developer layer are in contact with each other? Alternatively, one to several sheets of middle paper are stacked between the upper paper and the lower paper so that the color former layer and the developer layer are in contact with each other. Such a pressure-sensitive recording sheet can be recorded on a plurality of sheets at the same time by printing once, and is therefore useful as various slip sheets.

On the other hand, in order to improve the accuracy and speed of office work, it has become widely used to print a bar code or OCR reading characters on a slip and read it using an optical reading device. It's coming.

However, using a slip having a conventional structure in which the above pressure-sensitive recording sheets are combined (that is, a combination of upper paper-lower paper or upper paper-medium paper-lower paper),
Printing a barcode or the like has the following problems.

One of the problems is that when a bar code or the like is printed on such a slip using a pressure printer or a typewriter, an ink ribbon is not used to print on the upper surface of the upper paper. That is not the case. Although this ink ribbon can be used repeatedly to some extent, the density of characters printed gradually decreases with use, so it is necessary to replace the ink ribbon.When actually printing a large amount, many printers or Since the typewriters are arranged side by side to perform the printing operation, the state of the ink ribbon of each of the printer and the typewriter must be maintained and inspected and replaced, which requires a great deal of labor and cost. The consumption of ink ribbon is also not negligible.

Another problem relates to the water resistance of such slips. Vouchers printed with barcodes and OCR reading characters are increasingly used as delivery vouchers in physical distribution systems. Generally, delivery slips are used by being attached to the outer surface of the object to be transported.
At this time, the slip may be damaged by rain or other water and may be torn, or the printed characters may be blurred or erased. In addition, the acid,
It may come in contact with alkalis and other chemicals, and there is a great risk that the shipping slip will be damaged.

When a synthetic paper made of plastic is used as a support for imparting water resistance to such a slip, the water resistance is improved, but the synthetic paper is opaque.
Do not use an ink ribbon to print on the upper paper, because the color image formed on the developer layer of the middle or lower paper under the upper paper cannot be read from the upper paper. I can't.

As a coloring paper having water resistance and solvent resistance, there is a recording material in which a transparent film (polyethylene, polyethylene terephthalate, etc.) is adhered and coated on the self-coloring layer of a self-coloring type pressure-sensitive sheet via an adhesive. It has been proposed (see Japanese Utility Model Publication No. 48-15135). It is considered that this recording material protects the self-coloring layer from water, but when manufacturing this recording material, pressure must be applied in order to attach a transparent film to the self-coloring layer using an adhesive, When the pressure is applied to the self-coloring layer, so-called "coloring fog" occurs. Furthermore, the sticking of the transparent film is carried out using a transparent film carrying an adhesive layer, in which case the solvent remains in the adhesive layer, and the solvent destroys the capsules contained in the self-coloring layer. There is also a problem that color fog occurs. In addition to the delivery note that is generally attached to the object to be transported, the delivery slip is composed of a stack of multiple slips such as receipts and copies. When using a pressure-sensitive recording material that is affixed, there is a restriction that this recording material must be used as an upper sheet and must be attached to an object to be transported. Depending on the procedure of the delivery business, there is a case where it is desired to attach an arbitrary slip in the above-mentioned laminated body to an object to be transported, and in such a case, the recording material to which the transparent film is attached cannot be used. When a recording material coated with a transparent film is set on the second and subsequent sheets to form a laminated body, the printing pressure on this recording material decreases and the color density decreases, especially when a bar code is printed. There is also a problem that it is likely to occur.

Further, Japanese Unexamined Patent Publication No. 52-68513 discloses a recording sheet in which a protective layer of melt extruded resin such as polyolefin is formed on a self-coloring layer of a self-coloring type pressure-sensitive sheet. Has been done. This recording sheet has the features of no color fog and excellent color development under pressure, and excellent water resistance, stain resistance, etc., but the production cost is high, and it is printed on two or more slips. In this case, there is the same problem as in the case of the recording material to which the transparent film is attached.

[0011]

SUMMARY OF THE INVENTION An object of the present invention is to print by using a pressure printer, a typewriter or the like without using an ink ribbon, and a slip of a pressure-sensitive recording sheet is a laminate of a plurality of sheets. Even in such a case, a pressure-sensitive recording which can form a color image having a required color density from the uppermost sheet (upper paper) to the lowermost sheet (generally lower paper) and has excellent water resistance. To provide the material.

Another object of the present invention is to provide a method of image-wise pressing the above pressure-sensitive recording material and reading the formed color image using an optical reading device.

[0013]

The present invention is a self-coloring type in which a self-coloring layer containing microcapsules containing an electron-donating color former and an electron-accepting developer is provided on the upper surface of a support. A pressure-sensitive recording material comprising a pressure-sensitive sheet and a self-supporting plastic transparent sheet laminated on the self-coloring layer so that they can be separated without damaging the self-coloring layer. is there.

One mode of this pressure-sensitive recording material is a pressure-sensitive recording material in which one or a plurality of self-coloring type pressure-sensitive sheets having the same structure are stacked below the self-coloring type pressure-sensitive sheet. Is.

In another aspect of the present invention, a self-coloring layer containing microcapsules containing an electron-donating color former and an electron-accepting developer is provided on the upper surface of a support, and the electron-donating layer is provided on the lower surface. Self-coloring type pressure-sensitive sheet provided with a color former layer containing microcapsules containing a color developing agent,
A self-supporting plastic transparent sheet laminated on the self-coloring layer so that the self-coloring layer can be separated without damaging the self-coloring layer. A pressure-sensitive recording material comprising a color-developing sheet having on its upper surface a developer layer containing a sex developer.

One embodiment of this pressure-sensitive recording material has a developer layer containing an electron-accepting developer on the upper surface between the self-coloring type pressure-sensitive sheet and the color-developing sheet. It is a pressure-sensitive recording material in which one or a plurality of intermediate sheets each having a color-forming agent layer containing a microcapsule containing a donor color-forming agent on the lower surface are sandwiched.

Still another aspect of the present invention is that the upper surface of the support is
A self-coloring type pressure-sensitive sheet provided with a microcapsule containing an electron-donating color former and a self-coloring layer containing an electron-accepting color developer, and the self-coloring layer is damaged on the self-coloring layer. Pressure-sensitive recording material containing a transparent sheet made of self-supporting plastics stacked so that they can be separated without being image-wise pressed from above the transparent sheet. The image forming / reading method is characterized in that the color image formed on the color forming layer is read from above the transparent sheet using an optical reading device.

In still another aspect of the present invention, a self-color-developing layer containing microcapsules containing an electron-donating color former and an electron-accepting developer is provided on the upper surface of a support, and an electron-lowering layer is provided on the lower surface. A self-coloring type pressure-sensitive sheet provided with a color-forming agent layer containing microcapsules encapsulating a donative color-developing agent, and overlaid on the self-coloring layer so that the self-coloring layer can be separated without damage. Pressure-sensitive recording including a transparent sheet made of self-supporting plastic, and a color-developing sheet having an upper surface having a developer layer containing an electron-accepting developer, which is laminated on the lower side of the self-coloring type pressure-sensitive sheet. The material is image-wise pressed from above the transparent sheet, and the colored image formed on the self-coloring layer of the self-coloring type pressure-sensitive sheet formed by this pressing or the developer layer of the color-developing sheet is transparent sheet. Optical read from above An image forming and reading method characterized by reading using the apparatus.

The self-coloring type pressure-sensitive sheet in the pressure-sensitive recording material of the present invention has the same structure as a known self-coloring type pressure-sensitive sheet. The self-coloring layer of the self-coloring type pressure-sensitive sheet is a self-coloring layer having a form containing microcapsules containing an electron-donating color former and an electron-accepting developer in the same layer,
Further, it may be any of a self-color-developing layer in which a color-developing layer containing microcapsules containing an electron-donating color-developing agent and a color-developing layer containing a developer are laminated.

When the self-color-developing layer comprises a color-developing layer and a color-developing layer, either the color-developing layer or the color-developing layer may be provided on the support side, but the color-developing layer is on the outside. When the self-coloring type pressure-sensitive sheet is normally handled, the microcapsules are destroyed and the color-developing agent comes out and reacts with the color-developing agent, which may cause color stains. A layer is preferably provided, and a developer layer is preferably provided on the layer.

As the support, paper made of wood pulp or synthetic paper made of plastic material is used as in the conventional self-coloring type pressure sensitive sheet.

The color-forming agent-containing microcapsules contained in the above-mentioned self-coloring type pressure-sensitive sheet can be formed in the same manner as the color-forming agent-containing microcapsules used in conventional self-coloring type pressure-sensitive sheets. The microcapsules containing the color former can be produced by any method known per se, for example, an interfacial polymerization method, an internal polymerization method, a phase separation method, an external polymerization method, a coacervation method or the like.

As the color former, a phthalide compound,
Uses various compounds such as azaphthalide compounds, fluoran compounds, phenothiazine compounds, leuco auramine compounds, rhodamine lactam compounds, triphenylmethane compounds, diphenylmethane compounds, triazene compounds, spiropyran compounds, fluorene compounds can do. In particular, when reading with an optical reading device (for example, a bar code reader), in order to obtain a color-developed image with a high reading rate, the absorption maximum of the color-developed image obtained by the reaction with the color developer is used as the color-developing agent. It is preferable to use a phthalide compound, an azaphthalide compound, a diazaphthalide compound, and a fluorane compound having a value of 620 to 720 nm.

The wall material of the microcapsules is not particularly limited as long as it is a water-insoluble or oil-insoluble polymer which is conventionally used as a wall material of the color-forming agent-containing microcapsules of the pressure-sensitive recording material. The wall material of the microcapsule is particularly preferably a polyurethane urea resin or a melamine formaldehyde resin because of its high resistance to thermal fog.

The color developer contained in the above-mentioned self-coloring type pressure-sensitive sheet includes acid clay, activated clay, attapulgite, zeolite, bentonite, clay substances such as kaolin, metal salts of aromatic carboxylic acid, and phenol formaldehyde. Resin etc. can be mentioned.

A color former layer containing microcapsules containing the electron-donating color former of the above-mentioned self-coloring type pressure-sensitive sheet;
The self-coloring layer in the form of a developer layer containing a developer,
A color developer layer-forming coating liquid containing the microcapsules and a color developer layer-forming coating liquid containing a developer are prepared, and, for example,
When the color former layer is provided on the support side, the color developer layer forming coating liquid is applied onto the support and dried, and then the color developer layer forming coating liquid is applied onto the color developer layer and dried. Can be formed. Further, the coating liquid for forming the color developing agent layer and the coating liquid for forming the color developing agent layer may be simultaneously applied in a multilayer manner to form the self-coloring layer as described above.

A self-coloring layer containing microcapsules containing an electron-donating color developing agent and an electron-accepting color developing agent in the same layer can be used as a coating liquid for forming a color-developing agent layer as described above. It can be formed by mixing the coating liquid for forming the colorant layer, coating the resulting mixture on a support, and drying.

The coating liquid for forming the color former layer is prepared by dispersing or dissolving microcapsules containing a color former and the like, a binder conventionally used in the color former layer, a capsule protector and the like in water.

Further, the total content of the binder and the capsule protecting agent in the coating liquid for forming the color forming agent layer is 20 of the total solid content in the coating liquid (microcapsules are calculated by taking the entire microcapsule as the solid content). -40% by weight, especially 2
It is preferably 5 to 35% by weight. If the content is less than the above range, the capsule of the color forming agent layer is destroyed and color stain is liable to occur, and if it is more than the above range, the color density tends to decrease.

The coating liquid for forming the developer layer is prepared by adding and mixing the binder and the inorganic pigment dispersion liquid which are conventionally used in the developer layer to the dispersion liquid of the developer as described above.

The content of the binder in the coating liquid for forming the color developer layer is preferably 10 to 30% by weight based on the total solids in the coating liquid. If the content is less than the above range, the coating strength of the color developer layer tends to decrease, and if it is more than the above range, the color density tends to decrease.

The color former layer and the developer layer can be formed on the support by a method known per se, for example, an air knife coating method, a blade coating method, a curtain coating method and the like. A color developer layer and a developer layer are formed by the curtain coating method because simultaneous multi-layer coating of the color developer layer forming coating liquid and the color developer layer forming coating liquid is possible and high speed coating is possible. It is advantageous to do

The self-supporting plastic transparent sheet of the pressure-sensitive recording material of the present invention is not particularly limited, but is made of, for example, polyethylene terephthalate, polyethylene, polypropylene, nylon, vinylon, polystyrene, polyvinyl chloride, cellulose acetate and the like. It is preferably a transparent self-supporting sheet. This plastic transparent sheet preferably has a haze value of 80% or less when measured by a fully automatic direct reading haze computer HGM-2DP manufactured by Suga Test Instruments Co., Ltd.

The thickness of this transparent plastic sheet is 2
It is preferably 0 to 200 μm, and particularly preferably 30 to 75 μm. Further, even if this transparent plastic sheet is made slightly larger than the size of the self-coloring type pressure-sensitive sheet, and an adhesive layer is formed outside the pressure-sensitive recording sheet, it can be easily attached to an object to be transported. Good.

A preferred embodiment of the pressure-sensitive recording material of the present invention will be described with reference to FIG. 1, which is a sectional view schematically showing a cross section of an example of the pressure-sensitive recording material of the present invention. In FIG. 1, a pressure-sensitive recording material 10 comprises two self-coloring type pressure-sensitive sheets 20 laminated together, on which a transparent plastic sheet 30 is formed.
It is configured by stacking. Self-coloring type pressure sensitive sheet 2
In No. 0, the color developing agent layer 22 is provided on one surface of the support 21, and the color developing agent layer 23 is provided thereon. A self-coloring layer is formed by the color-developing layer 22 and the color-developing layer 23, and the self-coloring type pressure-sensitive sheet 20 is laminated so that both self-coloring layers are on the upper side.

Next, using the pressure-sensitive recording material of the present invention,
A method of forming a colored image on the self-coloring type pressure-sensitive sheet 20 will be described with reference to FIG. In FIG. 1, a suitable pressure printing device (not shown) such as a pressure printer (for example, a dot impact printer), a typewriter, etc. is used, and an ink ribbon is not used. Printing is performed on the transparent sheet 30. The printing form includes ordinary characters, numbers, symbols, etc., as well as barcodes, OCR readable characters, and the like. By this pressure printing, the microcapsules of the color former layer 22 of both the self-coloring type pressure-sensitive sheets 20 are destroyed, and the color former contained in the microcapsules reacts with the color former of the color developer layer 23 to form a color. Then, a color image 40 is formed.

At the time of this printing, the color image 40 is substantially not transferred to the plastic transparent sheet 30,
Transparency is maintained. Although FIG. 1 shows a mode in which two self-coloring type pressure-sensitive sheets 20 are laminated, the number of self-coloring type pressure-sensitive sheets may be one.
It is generally a laminated body of not more than one sheet.

When the pressure-sensitive recording material 10 is a delivery slip, a color-developed image printed on the self-coloring type pressure-sensitive sheet 20 is usually formed, and then any of the stacked self-coloring type pressure-sensitive sheets 20 is formed. The remaining self-coloring type pressure sensitive sheet 20 is removed, leaving one sheet, and the remaining one self-coloring type pressure sensitive sheet 2 is removed.
0 and the plastic transparent sheet 30 are attached to an object to be transported with the plastic transparent sheet 30 facing outside. The self-coloring type pressure-sensitive sheet 20 is made of a plastic transparent sheet 30 even if an object to be transported gets wet due to rain or the like.
Protected from water, it will not get wet and damaged.

Next, regarding a method of reading a color-developed image formed by printing on the pressure-sensitive recording material of the present invention, a mode of reading a color-developed image formed on an example of the pressure-sensitive recording material of the present invention is schematically shown. Description will be made with reference to FIG. 2 which is a cross-sectional view. Figure 2
In this case, an optical reading device (for example, a bar code reader) 50 is arranged on the plastic transparent sheet 30, and the color image (for example, bar code) 40 formed on the self-coloring type pressure sensitive sheet 20 is read. . Since the colored image 40 is not transferred to the plastic transparent sheet 30 when printing on the pressure-sensitive recording material 10 of the present invention, the transparency of the plastic transparent sheet 30 is not impaired. It is possible to read the color development image 40 substantially without error. Further, since the transparent plastic sheet 30 and the self-coloring type pressure-sensitive sheet 20 can be separated, which self-coloring type pressure-sensitive sheet 20 in the laminate of the self-coloring type pressure-sensitive sheet 20 used for printing is the plastic. Even if it is under the transparent sheet 30, the color image 40 can be read without any problem.

Next, the pressure-sensitive recording material of another embodiment of the present invention will be described. FIG. 3 is a sectional view schematically showing a section of an example of the pressure-sensitive recording material of the present invention. In FIG. 3, the pressure-sensitive recording material 60 comprises a color developing sheet 70 having a developer 71 on one side of a support 71, and a color developing agent layer 82 on one side of a support 81 on the opposite side. The color developer layer 9 is provided on one surface of the intermediate sheet 80 provided with the developer layer 83 and the support 91.
2 is provided, a developer layer 93 is provided thereon, and a color former layer 92 is provided on the surface opposite to the support 91, as shown in FIG. And a transparent plastic sheet 30 are stacked on the transparent transparent sheet 30.

The color-developing sheet 70 and the intermediate sheet 80 are similar to the lower and middle sheets of the conventional pressure-sensitive recording sheet, respectively, and the support, the color-developing agent layer and the developer layer constituting them are The self-coloring type pressure-sensitive sheet is the same as the support, the color-developing layer and the color-developing layer described above (however, the color-developing layer and the color-developing layer are not laminated).
The self-coloring type pressure-sensitive sheet 90 is provided with only the color-developing agent layer 92 on the surface opposite to the surface on which the self-coloring layer of the self-coloring type pressure-sensitive sheet 20 is provided.

Using the pressure-sensitive recording material of the present invention, a self-coloring type pressure-sensitive sheet 90, an intermediate sheet 80 and a color-developing sheet 7 are used.
A method of forming a color image on 0 will be described with reference to FIG. In FIG. 3, a suitable pressure printing device (not shown) such as a pressure printer (for example, a dot impact printer), a typewriter, etc. is used, and an ink ribbon is not used. Printing is performed on the transparent sheet 30. The printing form includes ordinary characters, numbers, symbols, etc., as well as barcodes, OCR readable characters, and the like. By this pressure printing, the microcapsules of the color former layer 92 of the self-coloring type pressure-sensitive sheet 90 are destroyed, and the color former contained in the microcapsules reacts with the color former of the color developer layer 93 to develop color, A colored image 40 is formed. At the same time, the microcapsules of the color former layer 92 on the lower surface of the self-coloring type pressure-sensitive sheet 90 are destroyed, and the color former contained in the microcapsules becomes the color developer layer 83 of the intermediate sheet 80.
Reacts with the color-developing agent to develop color, and the color-developed image
Is formed, the microcapsules of the color developing agent layer 82 of the intermediate sheet 80 are destroyed, and the color developing agent contained in the microcapsules reacts with the color developing agent of the color developing agent layer 73 of the color developing sheet 70 to develop color, The colored image 40 is formed on the developer layer 73.

At the time of this printing, the color image 40 is substantially not transferred to the plastic transparent sheet 30,
Transparency is maintained. Although FIG. 3 shows a mode in which one intermediate sheet 80 is interposed, the intermediate sheet 80 may be omitted, and in practice, it is common to interpose one to four intermediate sheets.

When the pressure-sensitive recording material 60 is a delivery slip, it is usually printed as described above to form a color image,
Any one of the self-coloring type pressure-sensitive sheet 90, the intermediate sheet 80, and the color-developing sheet 70 is left and the remaining sheets are removed, and the remaining one sheet and the transparent plastic sheet 30 are made of a transparent plastic sheet. The sheet 30 is attached to the outer surface of the object to be transported. Even if an object to be transported is exposed to rain or the like and gets wet with water, the sheet is protected by the plastic transparent sheet 30, so that it does not get wet and damaged.

The method for reading the color image formed by printing on the pressure-sensitive recording material of the present invention is the same as that described with reference to FIG. 2 for the pressure-sensitive recording material of another embodiment of the present invention. Since the colored image 40 is not transferred to the plastic transparent sheet 30 when printing on the pressure-sensitive recording material 60 of the present invention, the transparency of the plastic transparent sheet 30 is not impaired. It is possible to read the color development image 40 substantially without error. Further, since the plastic transparent sheet 30 and the self-coloring type pressure sensitive sheet 90 can be separated, which of the self-coloring type pressure sensitive sheet 90, the intermediate sheet 80 and the color developing sheet 70 used for printing is the plastic transparent sheet 30. The color image 40 can be read without any problem even under the condition.

[0046]

EXAMPLES Next, the present invention will be described in more detail by way of examples.

[Example 1] [Preparation of coating liquid for forming color former layer] As a color former, the following formula (1) was used.

[0048]

[Chemical 1]

3.0 g of a phthalide compound represented by the following formula (2)

[0050]

[Chemical 2]

3.0 g of a fluoran compound represented by
And 2-anilino-3-methyl-6-diethylaminofluorane (4.0 g) were added to diisopropylnaphthalene 100.
dissolved in g. 10 g of carbodiimide-modified diphenylmethane diisocyanate (manufactured by Mitsui Toatsu Chemicals, Inc., trade name "MDI-LK"), isocyanurate of hexamethylene diisocyanate (manufactured by Nippon Polyurethane Co., trade name "Coronate EH") was added to the obtained oily liquid. ) 5g
And 3.0 g of ethylenediamine butylene oxide adduct (addition number of butylene oxide to ethylenediamine: 16.8 mol, molecular weight: 1267) are dissolved,
A primary solution was prepared.

Next, 10 g of polyvinyl alcohol and 5 g of carboxymethyl cellulose were dissolved in 140 g of water to prepare a secondary solution. While vigorously stirring the secondary solution,
The above primary solution was poured into this to form an oil-in-water emulsion. The size of the oil droplet is 6.0μ
When the temperature reached m, the stirring was weakened, 100 g of water at 20 ° C. was added to this emulsion, 0.5 g of tetraethylenepentamine was further added, and the system temperature was gradually increased to 80 ° C.
And maintained at this temperature for 90 minutes.

Polyvinyl alcohol (PVA-20 manufactured by Kuraray Co., Ltd.) was added to the thus obtained capsule liquid.
100 g of a 10% by weight aqueous solution of 5) and 60 g of starch (average particle size 15 μm) were added. Next, water was added to adjust the solid content concentration to 20% by weight to prepare a coating liquid for forming a color developer layer.

[Preparation of color developer dispersion] 3,5-bis (α
100 g of zinc-methylbenzyl) salicylate was added to 80 g of xylene and dissolved. This xylene solution was mixed with 4% polyvinyl alcohol (Kuraray Co., Ltd., PVA-20
5) Add to 120 g of the aqueous solution, and further add 4 g of a 10% polyoxyethylene sorbitan oleate aqueous solution as a surfactant, and use an homogenizer to prepare an emulsion dispersion so that the average particle size of the emulsion becomes 1.0 μm. Prepared.

Next, 180 g of water was added to this emulsified dispersion and then heated, xylene was azeotroped with water to remove it from the emulsified dispersion, and the solid content was adjusted to 30% to develop the color. An agent dispersion was obtained.

[Preparation of coating liquid for forming developer layer] 120 g of calcium carbonate, 20 g of zinc oxide, 1 g of sodium hexametaphosphate and 200 g of water were used to obtain an inorganic pigment dispersion liquid which had been atomized by a sand mill.

To 300 g of this inorganic pigment dispersion, 20 g of 48% styrene-butadiene rubber latex was added,
Further, 15 g of the above-mentioned color developer dispersion was added and water was adjusted to a solid content concentration of 20% to prepare a color developer layer forming coating solution.

[Preparation of self-coloring type pressure-sensitive sheet] Basis weight 40
on one surface of g / m ² base paper, as the above color former layer forming coating liquid is applied at a solids of 4.0 g / m ^2, the above-mentioned color developer on the further color former layer Coating solution for layer formation is 6.0
It is coated by the simultaneous multilayer curtain coating method so that it is coated with a solid content of g / m ² , and dried at 80 ° C. to form a self-coloring layer consisting of a color-developing layer and a developer layer on one surface of the paper. The formed self-coloring type pressure sensitive sheet was produced.

[Preparation of Pressure Sensitive Recording Material] A pressure sensitive recording material was prepared by stacking a 38 μm-thick transparent sheet of polyethylene terephthalate on the self-coloring layer of the above-mentioned self-coloring type pressure-sensitive sheet.

[Printing and Reading Test] From the transparent sheet of the pressure-sensitive recording material prepared above, a dot impact printer (MICROLINE 8 manufactured by Oki Electric Co., Ltd.) was used.
340SV) and without CODE ribbon, CODE
The eight digits of 39 were printed on a bar code.

Ten minutes after the above printing, the bar code formed on the self-coloring type pressure-sensitive sheet was read by a bar code reader (Nippon Denso Co., Ltd., BHT-2061).
The reading test was performed from the transparent sheet side using. When the reading test was repeated 20 times, it was possible to read accurately all times.

[Water resistance test] 10 drops of water droplets were dripped on the transparent sheet of the pressure-sensitive recording material on which the above-mentioned printing was performed, and then 2 with a finger.
Although it was rubbed strongly 0 times, the self-coloring type pressure-sensitive sheet was not damaged at all, and the printed barcode could be read by a barcode reader.

[Example 2] [Preparation of self-coloring type pressure-sensitive sheet] The self-coloring type pressure-sensitive sheet prepared in the same manner as in Example 1 on the side opposite to the surface on which the self-coloring layer was formed. The coating solution for forming the color-forming agent layer prepared in Example 1 was applied to the surface by a curtain coating method so that the solid content was 4.0 g / m ² and dried to form a self-color-forming layer on one surface of the base paper. Was prepared, and a self-coloring type pressure-sensitive sheet having a color former layer on the opposite surface was prepared.

[Preparation of Intermediate Sheet] The coating solution for forming the color-forming agent layer prepared in Example 1 was coated at a solid content of 4.0 g / m ^{2 on} one surface of a base paper having a basis weight of 40 g / m ^2. Was applied by the curtain coating method as described above, and the developer for forming the developer layer prepared in Example 1 was 5.0 g / m 2 on the surface opposite to the base paper.
^It was applied by the curtain coating method so that the solid content of ² was applied, and dried at 80 ° C. to prepare an intermediate sheet.

[0065] on one surface of a basis weight of 40 g / m ² base paper Preparation of color sheet, developer layer forming coating liquid prepared in Example 1 is coated with a solid content of 5.0 g / m ² So that
It was applied by the curtain application method and dried at 80 ° C. to prepare a color developing sheet.

[Production of Pressure Sensitive Recording Material] The self-developing pressure sensitive sheet, the intermediate sheet and the color developing sheet produced as described above are shown in FIG.
And a transparent sheet made of polyethylene terephthalate having a thickness of 38 μm was overlaid on the self-coloring layer of the self-coloring type pressure-sensitive sheet to prepare a pressure-sensitive recording material as shown in FIG.

[Printing and reading test] Bar codes were printed on the transparent sheet of the pressure-sensitive recording material prepared above in the same manner as in Example 1 to form on the self-coloring type pressure-sensitive sheet. The bar code was subjected to a reading test in the same manner as in Example 1. 20 reading tests
Repeated times, all could be read accurately.

The bar code formed on the color-developing sheet by the above printing was also able to be accurately read all the times by the same reading test as above.

[Water resistance test] With respect to the pressure-sensitive recording material on which the above printing was carried out, a water resistance test was conducted in the same manner as in Example 1, and it was found that the self-coloring type pressure-sensitive sheet was completely damaged. The printed barcode could be read by a barcode reader.

[0070]

The pressure-sensitive recording material of the present invention has the advantage that, even when the slip of the pressure-sensitive recording sheet is composed of a laminate of a plurality of sheets,
Even if you print using a pressure printer or typewriter without using an ink ribbon, you can form a colored image with the required color density from the uppermost sheet to the lowermost sheet, and with excellent water resistance. It has a remarkable effect of having the property.

Therefore, the pressure-sensitive recording material of the present invention is particularly useful as a delivery slip for printing and recording which can be read by an optical reading device such as a bar code.

[Brief description of drawings]

FIG. 1 is a cross-sectional view schematically showing a cross section of a pressure-sensitive recording material of the present invention.

FIG. 2 is a cross-sectional view schematically showing an aspect of reading a color-developed image formed on the pressure-sensitive recording material of the present invention.

FIG. 3 is a sectional view schematically showing a section of the pressure-sensitive recording material of the present invention.

[Explanation of symbols]

 10 Pressure-sensitive recording material 20 Self-coloring type pressure-sensitive sheet 21 Support 22 Color-developing layer 23 Developer layer 30 Plastic transparent sheet 40 Color image 50 Optical reader 60 Pressure-sensitive recording material 70 Color-developing sheet 71 Support 73 Develop Coloring agent layer 80 Intermediate sheet 81 Support 82 Coloring agent layer 83 Developer layer 90 Self-coloring type pressure sensitive sheet 91 Support 92 Coloring agent layer 93 Developer layer

Claims (6)

[Claims] 1. A self-coloring type pressure-sensitive sheet having microcapsules containing an electron-donating color developing agent and a self-coloring layer containing an electron-accepting developer on the upper surface of a support, and a self-coloring sheet. A pressure-sensitive recording material comprising: a transparent sheet made of a self-supporting plastic, which is laminated on the layer so as to be separated without damaging the self-coloring layer. 2. The pressure-sensitive recording material according to claim 1, wherein one or a plurality of self-coloring type pressure-sensitive sheets having the same structure are stacked below the self-coloring type pressure-sensitive sheet. 3. A self-coloring layer containing microcapsules containing an electron-donating color former and an electron-accepting developer is provided on the upper surface of the support, and the electron-donating color agent is provided on the lower surface. Self-coloring type pressure-sensitive sheet provided with a color-forming agent layer containing microcapsules to be encapsulated, self-supporting property on the self-coloring layer that can be separated without damage to the self-coloring layer A pressure-sensitive recording comprising a plastic transparent sheet, a color-developing sheet having an upper surface having a developer layer containing an electron-accepting developer, which is laminated on the lower side of the self-color-developing pressure-sensitive sheet. material. 4. A microcapsule which has, on the upper surface, a developer layer containing an electron-accepting developer between the self-coloring type pressure-sensitive sheet and the color-developing sheet, and which contains an electron-donating color developer. 4. The pressure-sensitive recording material according to claim 3, wherein one or a plurality of intermediate sheets each having a color-forming agent layer containing is contained on the lower surface. 5. A self-coloring type pressure-sensitive sheet in which microcapsules containing an electron-donating color former and a self-coloring layer containing an electron-accepting color developer are provided on the upper surface of a support, and a self-coloring sheet. A pressure-sensitive recording material containing a self-supporting plastic transparent sheet laminated on the layer so as to be separable without damaging the self-coloring layer, and image-wise pressed from the transparent sheet, An image forming / reading method characterized in that the color-developed image formed on the self-coloring layer of the self-coloring type pressure-sensitive sheet by this pressurization is read on the transparent sheet using an optical reading device. 6. A self-coloring layer containing a microcapsule containing an electron-donating color former and an electron-accepting developer is provided on the upper surface of the support, and the electron-donating color agent is provided on the lower surface. Self-coloring type pressure-sensitive sheet provided with a color-forming agent layer containing microcapsules to be encapsulated, self-supporting property on the self-coloring layer that can be separated without damage to the self-coloring layer A transparent sheet made of plastic, a pressure-sensitive recording material including a color-developing sheet having an upper surface having a developer layer containing an electron-accepting developer, which is laminated on the lower side of the self-coloring type pressure-sensitive sheet, is transparent. Image-wise pressure is applied from above the sheet, and the color-developed image formed on the self-coloring layer of the self-coloring type pressure-sensitive sheet formed by this pressure or the developer layer of the color-developing sheet is optically transferred from above the transparent sheet. Read with a reader Image formation characterized by taking
How to read.