JPS5931187A - Composite pressure sensitive copy sheet - Google Patents

Abstract

PURPOSE:To improve ink setting property at the time of back carbon printing, by providing an opaque layer containing kaolin clay, calcium carbonate or the like between the support and the carbon ink layer in a composite pressure sensitive copy sheet. CONSTITUTION:In composite pressure sensitive copy sheets 12, 16 each having a front surface provided with a no-carbon color developing layer C and a back surface provided with a carbon ink layer A used in a slip formed by setting no- carbon upper-lay paper 11, no-carbon underlay paper 12 having a back surface provided with the carbon ink layer A, back carbon paper 13 or the like, an opaque paint is applied to a support as the under coat of the layer A. The composition thereof consists of 20-70pts. kaolin clay, 15-70pts. calcium carbonate with an average particle size of 2mum or less and 5-30pts. titanium oxide and a mixture prepared by adding 15-30pts. binder to 100pts. sum of said fillers is coated in a coating amount of 5-10g/m<2> to form the opaque layer. By this method, the offsetting of carbon ink is prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a composite pressure-sensitive copying sheet. In pressure copying sheets, we have improved the ink centivity during bank carbon printing, and furthermore, we have provided a composite pressure-sensitive copying sheet that has excellent copyability while also preventing a decrease in surface whiteness due to penetration of back carbon ink. It is something to do.

In general, carbonless paper consists of an upper paper coated with 1x capsules containing an electron-donating colorless or light-colored leuco dye dissolved in an organic solvent (capsule oil) on the back side, and an electron-accepting It consists of a base paper with a color developer layer on its surface containing a color developer, and the two coated surfaces are stacked one on top of the other so that they face each other, and then the paper is inserted with a ballpoint pen or typewriter.
By applying pressure with K, etc., the capsule in the pressurized part is destroyed, and the capsule oil containing the leuco dye is transferred to the color developing layer and a color reaction occurs, thereby making it possible to obtain printed records. It is.

On the other hand, back carbon paper has been widely used in office forms since ancient times, and is coated with pigments such as black, navy blue, and red. A solid ink prepared by twisting waxes such as synthetic wax and fillers such as castor oil, silicone oil, and calcyrano carbonate is heated and melted to print on high-quality paper or medium-sized paper using a flexographic printing machine or a convex (concave) printing machine. Printed on the back of quality paper 2. Usually, when bank carbon paper is layered on top of regular Att soil such as high quality paper and pressure is applied with a ballpoint pen or typewriter, the carbon ink in that area will be printed on the regular paper. Transferred and recorded in print.

In recent years, demand for these composite Jf papers has increased significantly due to the rationalization of office work and the spread of computers, and their uses have also diversified. It has become increasingly common to use composite types of slips that take advantage of the 'F' and '?' characteristics of each.

Taking delivery slips from department stores as an example, slips such as the one shown in FIG. 1, which are a combination of bank carbon paper and one-time carbon paper, have been used. In the figure, 1.
Each sheet of 2,316 is a back carbore paper with a carbon ink layer A on the back side, 4.7 is a binary paper, and 5 is a one-time carbon paper.
is the sales floor space, 3 is the product pasted, 4 is the shipping receipt, 6 is the delivery slip,
7 functions as a delivery note. Of these, 4゜7 slips
reads the entry using an optical reader (also known as OCI)
The back side of the ocR paper is readable, memorized in the computer, and processed.Due to its characteristics, the back side of the ocR paper requires a strong contrast between the printed part and the blank part, and the reading device does not want to get dirty. One-time carbon paper 5 is inserted to avoid directly providing a carbon ink layer.

However, the above slip does not contain the following information:
'1 Since the customer receipt slip 1 is made of back carbon paper, your hands and clothing 1
There are disadvantages such as staining the paper or the need to insert one-time carbon paper 5 which does not function as a slip.For this reason, recently, carbonless paper and back carbon paper are combined as shown in Fig. 2. More and more paper slips are being used. In Fig. 2, 11 is a carbonless bottom paper, 12.16 is a carbonless bottom paper with a carbon ink layer A on the back side, 13 is a back carbon paper, and 14 is a carbonless bottom paper.
is an o c with a leuco dye-containing capsule layer B provided on the back side.
n paper, 17 is OCIt paper. Further, in the figure, C indicates a color developing layer for carbonless carbon. The functions of each slip correspond to the slips in Figure 1.
2 is a sales receipt, 13 is a shipping receipt, 14 is a shipping receipt, 1G is a receipt, and 17 is a delivery note. In the slip shown in Figure 2 (6), by using non-carbon paper for the customer receipt slip 11 and shipping receipt OCn J1 paper 14, the risk of getting the customer's hands dirty is eliminated, and at the same time, the one-time carbon paper is removed. It became possible.

The present invention is an improved composite pressure-sensitive close-up sheet which is used as 12.16 in the above-mentioned slips and has a carbonless color developing layer on the front surface and a carbon ink layer on the back surface. Normally, this composite pressure-sensitive copying sheet is produced by printing hot melted pot-melt type carbon ink on the back side of a rolled carbonless bottom paper using a flexo or convex (concave) printing machine according to the layout. built.

However, in the above-mentioned carbon ink printing, when the sheet is rolled up, the carbon ink may transfer to the carbonless color developing layer and cause stains (because the front and back sides of the sheet are touched). This has become a problem.

This is because the νf1 color layer has good receptivity to capsule oil etc. due to its original function, and the fact that it does not have the set-off properties of ordinary back carbon paper is a major problem in high-speed printing. It has become a paddle.

As a countermeasure to this problem, we used Luciuno®, a carbonated paper with good oil absorption, as base paper.
However, in this case, the carbon ink penetrates into the paper surface and is adsorbed, causing the ink's separation1)
1) Although the offability is improved, on the other hand, the commercial value as a bank carbon paper is inferior, such as the ability to reduce the whiteness of the surface due to ink penetration. Especially if you have a large number of copies of a slip, reduce the thickness of the copy paper (
The reality is that it is difficult to take measures against transparency and penetration.

The present inventors have improved the above drawbacks! As a result of repeated research, we have discovered that by applying an opaque paint consisting of a specific combination of fillers and a binder as an undercoat to Carbon Ink I4, a composite pressure-sensitive abdominal printing sort with excellent performance can be obtained. I found it.

That is, in the present invention, between the support and the carbon ink layer, a filler containing kaolin clay, calcium carbonate with an average particle size of 2 μm or less, and titanium oxide, and a binder are provided. Features of abdominal pressure sensitive 'ryJ
, which provides photo sheets.

When peta FD printing is performed with carbon ink through the opaque layer configured as described above, the amber layer on the front side that is forced to come into contact with the carbon ink layer on the back side 1111 in the winding state is also coated with carbon ink. The cent-off property is improved, so there is no smudging.Also, since no bleed-through occurs when the paper is transparent, the whiteness of the developing layer is maintained and the contrast of the colored print is clear, while the copying performance as a back carbon paper is improved. These excellent properties are probably due to the flat shape of the kaolin ink.
At the same time, the fine particles of calcium carbonate adsorb and fix the ink appropriately. As a result, when printing with carbon ink, it is thought that the ink sets faster, prevents bleed-through, and improves copyability, and the combination of titanium oxide, which has excellent opacity, eliminates see-through and improves color development. It is thought that the whiteness of the surface is maintained at a high level.

As shown above, the present invention has three types of J with different properties, J of +'i
By using the A material in combination, an unprecedented pressure-sensitive copying sheet was obtained, but in order to achieve the purpose of the present invention in a well-balanced manner, 3, t! The blending ratio of filler X-1 for Type IJ is 20 to 70 parts of kaolin clay, and other fillers may be added as long as the average particle size 2 effect is not inhibited.

Further, as a binder for adhesively fixing the J and fJ barbs, a natural or synthetic polymer, which is used in general coating paints, is used. Add these binders to the filler mixture RTT
1 () Add 15 to 35 parts to 0 parts to prepare an opaque paint.The type and blending ratio of the binder are appropriately selected depending on the required surface strength of the coating layer, but synthetic polymers When the emulsion is used alone or with other substrates, good printing properties and water resistance can be obtained.

''-4'' 30y (1 1'11.11+8! ) Apply on the tatami surface of the support at 5 to 10 f/
++r', preferably 6~7ri/? Coat it so that it looks like A [J], and roll it up with an opaque layer formed. Further, using a flexo printing machine, hot melted carbon ink is printed all over the uncoated layer of the above-mentioned roll to obtain a °C1 composite pressure-sensitive copy sheet.

The present invention will be explained below according to examples.

[Example 1] Disperse i'iiJ in 7rt parts of 30a of water and prepare kaolin dispersion by dissolving 0.21 parts of sodium hexametaphosphate and adding 75'a:lH of kaolin to this solution. did. Next, dissolve 0.05 parts by weight of sodium polycarboxylate as a dispersant in 11 parts by weight of water.
Then, 5 parts of titanium oxide were added to give a 1/1 fraction of titanium oxide. In addition, charcoal lj 9 calcium dispersion l night watch, water 32 h (parts polycarboxylic acid soak 0.25 Ilj j + l't11)
After that, 20 parts of calcium carbonate was added to prepare the mixture.

While stirring the forced phosphorus separation liquid 205 prepared as above, titanium oxide content 1jk liquid 1.6Il (,ht
1 part and 52 parts by weight of tunorsium carbonate dispersion liquid were added, and then 7 parts by weight of Sudelemp multi-layer mixture (solid content 4ti) was added.
%) 2(i) IEj l parts, oxidized flf; 1a) (solid content 20 ~) 50 ili: j total parts were added to prepare a paint for forming an opaque layer.

11. Apply the paint thus applied to the black side of commercially available carbonless paper (manufactured by NW 40'n, +41'f Paper Co., Ltd.). 6~71//l11' and the opaque coating amount is 5~6 f/n? A composite pressure-sensitive copying sheet was manufactured by printing as follows.

[Examples 2 to 14] Kaolin, titanium oxide and calcium carbonate were added in Table 1 K.
A composite pressure-sensitive close-up sheet was obtained in the same manner as in Example 1 using the following formulation.

[Comparison Example 1] An opaque layer should be provided on the back side of commercially available carbonless paper (NW40B, manufactured by Jujo Paper Industries).
A carbon ink layer was formed.

(It Comparison 1?12-5) As shown in Table 1, a composite pressure-sensitive seal lacking at least one of kaolin, titanium g2, and calcium carbonate was obtained in the same manner as in Example 1. Ta.

The following quality tests were conducted on the composite pressure-sensitive copying sheets shown in the above Examples and Comparative Examples.

(1) Opacity: When a standard black plate and a standard white plate are applied to the back of the sheet before printing with carbon ink, each reflectance is measured using a Hunter reflectance meter (using a 1 green filter made by Toyo F11 machine) IC, and the reflectance is The ratio of rates is expressed as a percentage. The higher the value, the better.

(2) Whiteness after ink application: Measured from the reflection trap on the sheet surface. The higher the number, the more transparent the show-through)
It is preferable that there is no such thing.

(3) Back removal +-1- (S1 Like Through): The removal of carbon ink to the surface of the sheet was observed and evaluated using Meat III.

(4) Set-off property: The degree of transfer of the carbon ink to the color developing layer was evaluated by observing with the naked eye.

(5) Suitability for copying - Type printing by folding the sheet onto high-quality paper, and observing the concentration of carbon ink transferred to the high-quality paper in one direction.

The test results are as shown in Table 1.

From Table 1, the composite pressure-sensitive copying sheet according to the example achieved satisfactory results in all evaluation items.

In particular, the blending ratio of fillers is 20 to 70 parts of kaolin clay, 15 to 70 parts of calcium carbonate Icum with an average particle size of 2 μ or less,
It can be seen that extremely excellent quality can be obtained when titanium oxide is used in the range of 5 to 30 parts.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram showing an example of a slip made by combining back car phone and one-time carbon paper. Fig. 2 is an explanatory drawing showing an example of a slip made by combining carbonless paper and bank carbon paper to which the present invention is applied. be. I+11・・・・・・Kanumasu customer receipt, 2.12・・・・・・
・Sales counter, 3.13...product pasting, 4.14・
...Shipping receipt, 5...One-time carbon paper, 6.16...Notification slip 17...
...Delivery slip, A...Carbon ink layer,
B... Leuco dye-containing capsule layer, C...
- Carbonless color developing layer. 1st concave 2nd required/7 (

Claims (2)

[Claims] (1) In a composite pressure-sensitive copying sheet comprising a carbonless color developing layer on the surface of a support and a carbon ink layer on the back, kaolin clay, average particle size, is added between the support and the carbon ink layer. Composite pressure-sensitive compound whose IRF signature is the provision of an impermeable 91 layer consisting of a binder and a filler containing calcium carbonate and titanium oxide of 2μ or less.
to . (2) The blending ratio of filler is kaolin clay 2o. parts, 15 to 70 parts of calcium carbonate with an average particle size of 2 μ or less,
Patent-1, characterized in that it contains 5 to 30 parts of titanium oxide.