JPH07205576A - Pressure sensitive confidential copying sheet without carbon paper - Google Patents

Abstract

PURPOSE:To copy confidential information by providing a coated layer having pressure sensitive adhesive performance and copying function without carbon paper on the whole face of a support body. CONSTITUTION:A pressure sensitive confidential layer contains a developer for copying paper without carbon paper in addition to an adhesive, a pigment, and a tackifier as base components. Thus, a useful sheet having both properties of necessary pressure sensitive adhesive performance and sufficient copying function without carbon paper can be obtained. The copying function without carbon paper is useful for obtaining a copy of confidential information.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention provides a pressure-sensitive confidential sheet having a coating layer provided on the entire surface of the support for obtaining confidentiality, but also having a function of a no-carbon copy paper. The present invention relates to a pressure sensitive confidential copying sheet.

[0002]

2. Description of the Related Art A pressure-sensitive confidential sheet is, for example, when the sheet is paper, it is apparently the same as ordinary paper, but the sheets and the sheets are not. When trying to bond with other support, the bonding is completed instantly by applying an appropriate pressure, and the confidentiality of information is printed on the surface to be pressure bonded before pressure bonding,
It can be obtained by using a method such as copying or writing.

On the other hand, no-carbon copying paper is a colorless or light-colored organic compound (hereinafter referred to as a color former) having an electron donating property, an adsorbing property, and a color-reactive property, and acid clay, activated clay, and phenol. It utilizes a contact reaction of an electron-accepting substance (hereinafter referred to as a developer) such as a resin and an organic acidic substance, and is disclosed in US Pat. No. 2,550,471 and 44,369.
As described in No. 20 specification and the like. No-carbon copy paper is coated on one side of a support with microcapsules containing a color former on top paper, on top of a developer coated bottom paper, and on both sides of the support a color developer and a developer separately. Mainly coated middle paper, and other examples include self-coloring type pressure sensitive recording paper in which both components of the middle paper are coated on the same surface of the support. Typical combinations for obtaining a copy include upper paper-lower paper, upper paper-medium paper-lower paper, and fine paper-self-coloring type pressure-sensitive recording paper. One copy is obtained.

Conventionally, sealed letters have been frequently used to obtain the confidentiality of information, but in recent years, various types of postcards have been devised that can provide confidentiality. For example, Japanese Patent Application Laid-Open No. 3-10895 and Japanese Utility Model Laid-Open No. 3-108595 disclose a heat-sensitive adhesive sheet using a thermoplastic resin. However, the heat-bonding requires a heating device, When printing with an electrophotographic printer, the heating element and the heat-sensitive adhesive layer may cause unnecessary adhesion during the fixing process of the toner due to high heat. It may cause damage, and there is the inconvenience that confidential information cannot be copied.

Further, Japanese Patent Laid-Open No. 3-26697 discloses a sheet which can provide airtightness only by pressure and pressure bonding, but according to these methods, airtightness can be obtained by pressure and pressure bonding. However, a so-called blocking phenomenon occurs in which the coated surface and the uncoated surface are unnecessarily integrated with each other due to a weak pressing force in the manufacturing process, the printing process, or during the storage process, etc. until the final form of pressure bonding. easy. As an improvement, there is a description in JP-A-3-100087 in which an adhesion-suppressing substance layer is further provided on an adhesive layer. This method is effective for improving blocking, but is most necessary for a confidential sheet. It is difficult to obtain high pressure and pressure bonding performance, and there is the inconvenience that confidential information cannot be copied.

What is common to the above methods is that there is an inconvenience that confidential information, which is supposed to be important, cannot be copied (copied). In order to improve this inconvenience, a form in which copying (copying) is possible by utilizing a no-carbon copying function is one in which a pressure-sensitive adhesive layer is provided on the surface opposite to the developer layer (Japanese Patent Application Laid-Open No. 2000-242242). Sho 63-157141, Utility Model No. 2-124166, Utility Model No. 1-169.
362, etc.), a peripheral portion of a color developer coating sheet, which is removably joined (JP-A-1-130993, JP-A-1-192589, etc.). A laminate of pressure-adhesive layers (Japanese Utility Model Laid-Open No. 2-59972, Japanese Patent Laid-Open No. 1-258988, 1-27128).
No. 3, etc.), a release layer provided between the support and the color developer layer (Japanese Patent Laid-Open No. 2-200478, etc.), and one in which a part of the color developer layer is pressure-bonded with a concealment seal. (Actual Kaihei 2-
104280). All of these have complicated manufacturing and processing steps, and simply use the lower paper of the noker-bon copy paper as it is as a substrate.

[0007]

According to the present invention, once pressure-bonded, it is not easily peeled off by normal handling, and when it is intentionally peeled off, it can be peeled smoothly with a pleasant touch. This sheet is provided with a coating layer on the entire surface of the support for the purpose of obtaining confidentiality, and also has the function of copying the marker to keep confidential information. It is a Bon copy sheet.

[0008]

SUMMARY OF THE INVENTION The pressure-sensitive security package of the present invention.
The main materials contained in the coating layer of the carbon copy sheet are adhesives, pigments, tackifiers, and color developers. The main purpose of using an adhesive is to obtain adhesiveness and adhesiveness with a support, and the reason for using a pigment is printability (ink absorption,
The tackifier is used for improving the pressure-bonding performance for obtaining airtightness. The color developer is then used to obtain the nocarbon copying function. These materials need to be used according to their purpose.

The adhesive used in the present invention can be selected from a wide range. For example, polyurethane-based, synthetic rubber-based, natural rubber-based, vinyl chloride-based, acrylic-based, styrene-butadiene-based, ethylene-vinyl acetate-based, vinylidene chloride-based, etc.
Tellurized starch, esterified starch, casein, gum arabic, gelatin, soda alginate, polyvinyl alcohol, carboxymethylcellulose, polyethylene oxide, hydroxyethylcellulose, polyacrylamide, polyvinylpyrrolidone, polyacrylic acid, Water-soluble polymers such as styrene-maleic anhydride copolymer can also be used. Among them, polyethylene oxide having a suitable softness and strong adhesion to a support and a glass transition temperature of -20 ° C are preferable.
Lower ones are preferred. These adhesives can be used in combination of two or more, and the target quality can be obtained by adjusting the types and amounts of the adhesive, pigment, tackifier, and color developer used as the main components. it can.

The purpose of the pigment used in the present invention is to improve printability (ink absorption, ink inking property, etc.), prevent blocking, improve writing on stationery, and the like. A wide range can be selected as long as it is accompanied. For example, metal oxides such as calcium, zinc, magnesium, aluminum, titanium, nickel, zirconium, manganese, tin, antimony, molybdenum, hydroxides, carbonates, silicates, kaolin, talc, active Inorganic pigments such as clay, urea formalin resin, melamine resin, styrene acrylic resin, benzoguanamine resin, starch particles and the like can also be used.

The tackifier used in the present invention is not particularly limited, and is generally an oligomer having a molecular weight of several hundreds to several thousands.
It is a generic term for (a medium molecular polymer having a dimer or more and a molecular weight of up to 10,000) and is also called a tackifier.

Specifically, gum rosin, wood rosin,
Natural rosins such as tol oil rosin, disproportionated rosin, hydrogenated rosin, polymerized rosin, maleated rosin, fumarized rosin, formaldehyde modified rosin, rosin phenol
Resin, modified rosin such as esterified rosin, terpene resin, aliphatic (C ₅ ) petroleum resin, aromatic (C ₉ ) petroleum resin, copolymerization (C ₅ / C ₉ ) Petroleum resin, alicyclic petroleum resin, styrene resin, alkylphenol resin, xylene resin, coumarone / indene resin, carnauba wax, rice wax, beeswax, seraca wax, paraffin wax, polyethylene wax, higher fatty acid and Examples thereof include derivatives, metal salts, silicones, and various solid plasticizers.

The type of developer is not particularly limited, and any conventionally known developer can be used. The color developer exerts a very useful effect in addition to obtaining the original carbon copying function which is the original purpose of use. For example, when an inorganic color developer such as acid clay or activated clay is used as a color developer, it can also serve as a pigment, which is one of the main materials for obtaining a pressure-sensitive confidential sheet. Further, when a phenol formaldehyde resin and its polyvalent metal salt or polyvalent metal salt of aromatic carboxylic acid is used as an organic developer,
It can also serve as a tackifier, which is one of the main materials for obtaining a pressure-sensitive confidential sheet. In addition, various auxiliary agents such as an antifoaming agent, an antiseptic, a dispersant, a deterioration inhibitor, a thickener, an antioxidant and a softening agent can be used in the coating layer, if necessary.

The support used in the present invention is not particularly limited and includes, for example, high-quality paper mainly composed of cellulose fibers, various synthetic papers, various coated papers, laminated papers, metal vapor-deposited papers, non-woven fabrics, Various plastic films can be used.

The total amount of coating mainly composed of adhesives, pigments, tackifiers, color developers and the like is preferably 1 to 20 g / m ² . This application amount is about half of the application amount when the application surface and the application surface are pressure-bonded, and the application amount is about half that when the application surface and the opposite surface of the application surface are pressure-bonded. As a coating method, a conventionally known coating method such as an air knife coater, a blade coater, a bar coater, flexographic printing or screen printing can be used.

[0016]

The present invention will be described in more detail with reference to the following examples, but the present invention is not limited thereto.
In the examples and comparative examples, "parts" and "%" indicate parts by weight and% by weight unless otherwise specified.

Example 1 As a pressure-sensitive adhesive, 100 parts of acrylic emulsion (manufactured by Nippon Synthetic Rubber Co., Ltd., trade name AE-944) in solid content was used, and as a tackifier, SN-TACK (manufactured by San Nopco, rosin). System) was added at 50 parts solids. 100 parts of activated clay dispersed on average 5 μm as a developer and pigment was added thereto and mixed uniformly, and finally the liquid solid content was 30
% To obtain a pressure sensitive confidential coating solution for a carbon copying sheet.

This coating solution was applied to 100 g / m ² of high-quality paper by air-knife coating so that the solid content was 6 g / m ² to obtain a pressure-sensitive, confidential, non-carbon copying sheet. It was The pressure sensitive confidential carbon copying sheet thus obtained was applied to Mitsubishi NCR Paper Co., Ltd. (48 g / m 2).
^{When 2} ) was overlapped and color was developed with a typewriter, a dark colored image equivalent to that of a normal noker copying system was obtained, and this top paper could be effectively used as a copy. Also, the color-sensitive pressure-sensitive confidential carbon copy sheet is cut into a size twice as large as an official postcard, and the supercalender is folded by folding it from the center so that the coated layers are in close contact with each other. −
When pressure was applied at a pressure of 200 Kg / cm using, the adhesion was instantly completed.

Example 2 As a pressure-sensitive adhesive, 100 parts of acrylic emulsion (manufactured by Nippon Synthetic Rubber Co., Ltd., trade name AE-944) in solid content was used, and as a tackifier, SN-TACK (manufactured by San Nopco, rosin). System) was added as solids in 20 parts. 100 parts of calcium carbonate (Tamapal TP123, manufactured by Okutama Kogyo Co., Ltd.) dispersed in an average of 3 microns was added thereto as a pigment, and 3,5-di (α-methylbenzyl) salicylic acid was added as a developer and a tackifier. Zinc salt was added in an amount of 30 parts in terms of solid content and mixed uniformly. The liquid is finally made into a liquid solid content of 3
The pressure-sensitive airtight non-carbon copying sheet and the coating were applied in the same manner as in Example 1 except that the coating solution was adjusted to 0% to obtain a coating solution for the pressure-sensitive airtight carbon copying sheet. A pressure-bonded product was obtained.

Example 3 As a developer and a tackifier, a pressure-sensitive, confidential non-carbon copying sheet was prepared in the same manner as in Example 2 except that 30 parts by weight of paraphenylphenol resin was added in solid content. , And pressure-pressed was obtained.

Example 4 As a developer and tackifier, salicylates, rosins,
A pressure-sensitive, confidential non-carbon copying sheet and addition were carried out in the same manner as in Example 2 except that 30 parts by solid amount of a color developing agent consisting of a polyvalent metal compound (as disclosed in JP-A-2-563) was added. A pressure-bonded product was obtained.

Example 5 A pressure-sensitive security coating layer containing no color developer of Example 4 was provided on the opposite surface (uncoated surface) of the pressure-sensitive security-marking carbon copying sheet of Example 4. A pressure-bonded product of the coating layers was obtained.

Comparative Example 1 Calcium carbonate (Tamapar TP123, manufactured by Okutama Kogyo Co., Ltd.) dispersed in an average of 3 μm was used as a pigment instead of the activated clay of the developer and pigment of Example 1 as 100 parts. A pressure-sensitive airtight sheet and a pressure-bonded product were obtained in the same manner as in Example 1 except for the above.

COMPARATIVE EXAMPLE 2 The coating liquid of Comparative Example 1 was used as a lower sheet of commercially available Mitsubishi NCR paper (106
(g / m ² ), except that the coating was performed on the coated surface in the same manner as in Example 1 to obtain a pressure-sensitive airtight carbon copy sheet and a pressure-bonded product.

The pressure-sensitive confidential sheet or the pressure-sensitive confidential sheet copying sheet obtained in the above Examples and Comparative Examples was evaluated for various characteristics according to the following test methods.

(Peeling Characteristics) 7 prepared in Examples and Comparative Examples
All types are moderately adhered, giving you a smooth touch and smooth
Could be peeled off. The double-sided coating of Example 5 can also be used as a tri-fold postcard in which confidential information can be kept.

(Coloring characteristics) Printing was performed with an electric typewriter in combination with an upper sheet of commercially available Mitsubishi NCR paper, and the coloring density was visually judged. As a result, all of Examples 1, 2, 3 and 4 can obtain a color density equivalent to or higher than that of the commercially available Mitsubishi NCR paper system, and is useful for obtaining confidential information by combining with the upper paper. Met. However, in Comparative Example 1, since no color developer was included in the coating layer, naturally no color was developed. In Comparative Example 2, the pressure-sensitive confidential layer was provided on the coating layer of the conventional lower paper, but only a thin color density was obtained. Therefore, when the pressure-sensitive airtight layer was thinned in order to increase the color density, the required pressure-bonding performance was not obtained, and it was not possible to obtain both pressure-bonding performance and color development performance.

(Blocking) Seven kinds of Examples and Comparative Examples were laminated with sheets so that the coated surfaces face each other, and a load of 0.5 Kg / cm ² was applied from above, humidity of 90%, and Celsius. The blocking state was observed after standing for 1 week at 40 ° C. As a result, the above-mentioned seven types and the commercially available carbon-carbon copying system put in for comparison were in good condition without any superiority or inferiority. From this fact, the pressure-sensitive confidential carbon copying sheet of the present invention can be handled in the same manner as a normal copying sheet of carbon, and in fact, it can be handled by touch or writing almost like the lower sheet. There was no change.

[0029]

The pressure-sensitive airtight carbon copying sheet of the present invention contains a color developer in the pressure-sensitive airtight coating layer containing an adhesive, a tackifier, and a pigment as a main component. By doing so, it is a useful sheet that combines two sufficient functions without impairing the necessary pressure-sensitive crimping performance and the marking function of the carbon nanotube.
It was

Claims (3)

[Claims] 1. A pressure-sensitive airtight sheet comprising a support and a coating layer containing three components (A) adhesive (B) pigment (C) tackifier as a basic component, the coating layer comprising: A pressure-sensitive confidential carbon copying sheet characterized by containing a color developer for copying paper. 2. Printing, copying, on the coating layer according to claim 1.
2. The pressure-sensitive confidential noker according to claim 1, wherein after the information is written by a method such as writing, the information writing surfaces are opposed to each other or the uncoated surface sheet is pressed against each other.
Bon copy sheet. 3. The pressure-sensitive, confidential no-carbon copying sheet according to claim 1, wherein the surface opposite to the coated surface of claim 1 is a pressure-sensitive confidential layer containing no developer. To.