JPH081104Y2 - Record sheet - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a recording sheet with improved printability.

(Prior Art) Pressure-sensitive copying paper is an electron-donating color former such as crystal violet lactone or benzoyl leuco methylene blue, and an electron-accepting color developer such as activated clay, bentonite, phenol resin, or polyvalent metal salt of aromatic carboxylic acid. It applies the principle of color development by the reaction of the colorant, and it coats the backside of the support with microcapsules containing colorant made by phase separation method, interfacial polymerization method, in-situ method, etc. A colored image can be obtained on the lower paper by applying pressure-sensitive printing on the surface of the upper paper with a writing instrument, typewriter, etc. with the lower paper formed by coating the surface of the support with the lower paper. If more copies are desired, the number of sheets of middle paper with the above-mentioned color developer applied to the front surface of the support and microcapsules on the back surface are provided between the upper and lower papers as needed. It is possible to obtain a large number of copies by inserting. Further, one type of pressure-sensitive copying paper is a so-called single pressure-sensitive recording sheet in which the above-mentioned microcapsules and a color developer are formed as a laminated or mixed layer.

In addition, the heat-sensitive recording sheet basically forms a heat-sensitive recording layer containing the same color former and developer as used in the pressure-sensitive recording paper, and both substances are contact-reacted by Joule heat from the thermal head. To obtain a color former.

By the way, the quality design of individual pressure-sensitive recording sheets and heat-sensitive recording sheets has so far been designed with emphasis on copyability and recording suitability. Therefore, the surface not coated with the coloring reaction agent, that is, the single pressure-sensitive recording sheet. Under the present circumstances, no particular consideration has been given to the fact that the non-recording surface of the sheet and the thermal recording sheet is not printed at all, or that ruled lines and characters are printed at most.
Therefore, these surfaces are the surfaces of the support as they are.

However, recent needs for forms are oriented toward visually appealing "colorful design forms" and there are many requests for design form printing such as corporate PR and corporate CM on the front or back of the form, and the printing effect is similar to commercial printing. We are in an era where effects are required.

However, the non-copying surface or the non-recording surface of the current single pressure-sensitive recording sheet or heat-sensitive recording sheet has a drawback that it is not suitable for high-grade printing because the surface of the support is exposed as described above.

(Problems to be Solved by the Present Invention) An object of the present invention is to provide a recording sheet with improved printability on the non-copying surface or the non-recording surface.

(Means for Solving the Problems) The present invention is directed to a recording sheet (1) utilizing a color-developing reaction between a color-developing agent and a color-developing agent, particularly a single pressure-sensitive recording sheet and a thermosensitive recording sheet, to which a color-developing reactive agent is applied. 3-20g / dry weight of paint mainly composed of pigment and adhesive on the uncoated surface
It is characterized in that a pigment coating layer is formed by coating so as to have a m ^{2 value} .

(Operation) The recording sheet (1) using the color-forming reaction between the color-developing agent and the color-developing agent in the above-mentioned configuration has a form in which oil-containing microcapsules having the color-developing agent dissolved on the surface are laminated or mixed with the color-developing layer. A single pressure-sensitive recording sheet having a pigment coating layer formed on the back surface of the sheet, a heat-sensitive recording sheet containing a color former and a developer on the front surface, and the back surface of the recording sheet. It also includes a pigment coating layer formed on.

Thus, the present invention is directed to a recording sheet (1) utilizing a color-developing reaction between a color-developing agent and a color-developing agent, particularly a single pressure-sensitive recording sheet and a thermosensitive recording sheet, in which a pigment is not applied to the surface on which the color-developing agent is applied. And a coating material containing an adhesive as a main component so as to have a dry weight of 3 to 20 g / m ² to form a pigment coating layer. In the case of forming the pigment coating layer, As pigments, kaolin, calcium carbonate, chisan white, titanium dioxide, pyrophyllite clay,
Calcium sulfite, calcium sulfate, aluminum hydroxide, zinc oxide, talc, zeolite, barium sulfate, amorphous silica, plastic pigments, etc. One or more of the well-known pigments used when forming coated paper for printing. Can be used together. As the adhesive, styrene-butadiene-based, acrylic-based, vinyl acetate-based copolymer latex and various modified starches, cold water-soluble starch, casein, soybean protein and other commonly known adhesives may be used alone or in combination. it can. The amount of the adhesive used with respect to the pigment is preferably limited to the range of 3 to 20% by weight. Further, if necessary, various auxiliary agents such as a dispersant, a thickener, a water retention agent, a defoaming agent, a water resistance agent, a lubricant, a dye, and a pH adjusting agent can be appropriately added to the coating layer.

Thus, when forming a pigment coating layer, the coating liquid is an air knife coater, a roll coater, a blade coater,
The coating is carried out by an ordinary coater such as a bar coater, but the coating amount is adjusted within the range of 3 to ²⁰ g / m ^{2 in} dry weight. By the way, if it is 3 g / m ² or less, sufficient printability cannot be imparted, and if it is 20 g / m ² or more, it is not necessary in terms of printability and it is also negative in cost.

After drying, the pigment coating layer is smoothed by a super calendar or a gloss calendar.

When the pigment coating layer is formed on the back surface of the single pressure-sensitive recording sheet, it is desirable to form the pigment coating layer on the back surface in advance before forming the pressure-sensitive recording layer and then form the recording layer.

When the pigment coating layer is formed on the back surface of the thermosensitive recording sheet, the order of forming the recording layer and the pigment coating layer does not matter.

A pigment coating layer is formed on the surface of the recording sheet having the above-described structure that is not coated with the color-forming reaction agent, and thus excellent printability is imparted.

Examples of the single pressure-sensitive recording sheet and the heat-sensitive recording sheet according to the present invention will be described below. The present invention is not limited to these embodiments.

Example 1 (when the recording sheet is a single pressure-sensitive recording sheet) [Pigment coating layer] 80 parts of kaolin ("UW-90" manufactured by EMC), fine particle heavy calcium carbonate ("Carbital" manufactured by Fuji Kaolin Co., Ltd.) ))
20 parts of sodium polyacrylate was used as a dispersant, and 0.2 parts of sodium polyacrylate was used to disperse the mixture in a Corres disperser to prepare a pigment slurry having a solid concentration of 68%, and 5 parts of oxidized starch (solid content) and styrene-butadiene copolymer latex (Nippon Synthetic ( "JSR 0696" manufactured by K.K.)
(Solid content) 13 parts was added to prepare a coating liquid having a solid concentration of 60%.

The coating liquid sheet to a dry coating amount of 40 g / m ² was coated and dried with a blade coater so that the 10 g / m ^2. The coated paper was passed through a super calendar for smoothing treatment.

[Single pressure sensitive recording sheet]

(Preparation of Capsule Dispersion) 20% aqueous solution of a copolymer consisting of 15 mol% vinyl sulfonic acid, 5 mol% styrene, 70 mol% acrylic acid and 10 mol% ethyl acrylate (25 ° C, pH2, concentration 20%) Viscosity of 50cp
s) 112.5 parts of water was added to 37.5 parts, and the pH was adjusted to 4 with a 20% NaOH aqueous solution.
The product adjusted to 6 was used as an aqueous medium for capsule production. Diisopropylnaphthalene (Kureha Chemical Co., Ltd. “K-11”) was prepared by dissolving 5 parts of crystal violet lactone.
3 ") 105 parts was added, and the mixture was emulsified and dispersed so that the average particle size was 5 μm, and then the temperature of the emulsion was raised to 70 ° C.

Next, 20 parts of methylated methylolmelamine initial condensate (“Beckamine APM” 80% concentration manufactured by Dainippon Ink and Chemicals, Inc.) was added to the system, and the system temperature was maintained at 70 ° C. for 1 hour while maintaining stirring. After cooling, a milky white capsule dispersion was obtained.

Next, 70 parts of wheat starch and 20 parts of dissolved oxidized starch (solid content) were added to prepare a capsule coating solution.

(Preparation of color developer coating liquid) 65 parts of aluminum hydroxide, 20 parts of zinc oxide, a mixture of zinc 3,5-di (α-methylbenzyl) salicylate and α-methylstyrene / styrene copolymer ( Blending ratio 80/20) 1
A dispersion obtained by pulverizing 5 parts, 5 parts of polyvinyl alcohol aqueous solution (solid content) and 300 parts of water with a ball mill for 24 hours,
20 parts (solid content) of carboxy-modified styrene / butadiene copolymer latex was added to obtain a developer coating liquid.

Then, with respect to the non-coated surface of the pigment coated paper, the microcapsule dispersion of 4g / m ² and color developer coating solution 5 g / m ² by an air knife coater (both dry weight)
A single layer pressure-sensitive recording sheet was obtained by applying and drying in a laminated form so that

(Example of use of the single pressure-sensitive recording sheet of the present invention) When multicolor printing was performed on the pigment-coated surface of the single pressure-sensitive recording sheet thus obtained, an excellent printing effect was exhibited and a colorful design form could be obtained.

Example 2 (when the recording sheet is a heat-sensitive recording sheet) The pigment coating liquid used in Example 1 was applied to a base paper of 40 g / m ² of tsubo by a blade coater so that the dry coating amount was 10 g / m ^2. Dried.

Then, a heat-sensitive coating layer was formed on the non-coated surface of the coated paper with an air knife coater.

The obtained heat-sensitive recording sheet was passed through a super calender and smoothed on both sides.

(Example of use of the thermosensitive recording sheet of the present invention) When multicolor printing was performed on the pigment coated surface of the thermosensitive recording sheet thus obtained, an excellent printing effect was exhibited and a colorful design form could be obtained.

(Effect) The recording sheet according to the present invention has a corporate PR,
By printing a desired design such as a corporate CM in multiple colors, an aesthetic high-class printing effect that has not been found in conventional recording sheets can be exhibited, and a colorful design form that appeals to the eyes can be obtained.

Therefore, the office work efficiency is improved for the person who handles the form, and the contribution to the improvement of the corporate image from the outside is also extremely large.

[Brief description of drawings]

FIG. 1 is a sectional view for explaining a single color recording sheet according to the present invention. FIG. 2 is a sectional view for explaining a heat-sensitive recording sheet according to the present invention. 1 ... Recording sheet, 2 ... Pigment coating layer, 3 ... Microcapsule layer, 4 ... Developer layer, 5 ... Single pressure-sensitive recording layer, 6 ... Thermal recording layer, 7 ... Support

Continuation of the front page (56) Reference JP-A-57-93193 (JP, A) JP-A-56-96992 (JP, A) JP-A-61-135784 (JP, A) Actual development 61-56080 (JP , U) Actual development Sho 60-191474 (JP, U)

Claims (2)

[Scope of utility model registration request] 1. A recording sheet (1) utilizing a color-developing reaction between a color-developing agent and a color-developing agent, wherein the recording sheet comprises an oil-containing microcapsule layer having a color-developing agent dissolved on the surface and a color-developing layer. It is a single pressure-sensitive recording sheet having a form, and is coated on the back surface of the sheet with a pigment and an adhesive as main components so as to have a dry weight of 3 to 20 g / m ^2, and a pigment coating layer is formed. A recording sheet characterized by being formed. 2. A recording sheet (1) utilizing a color-developing reaction between a color-developing agent and a color-developing agent, wherein the recording sheet is a heat-sensitive recording sheet containing a color-developing agent and a color-developing agent on the front surface, and the back surface of the recording sheet. A recording sheet, characterized in that a coating material containing a pigment and an adhesive as a main component is applied to a dry weight of 3 to 20 g / m ² to form a pigment coating layer.