JPS6351175A - Pressure sensitive recording sheet - Google Patents

Abstract

PURPOSE:To obtain the efficient contamination resistance, water resistance, oil resistance, abrasion resistance, and the good coloring property in use of the title pressure sensitive recording sheet, by a method wherein a smooth surface resin protection layer is established on one face of self coloring pressure sensitive paper and the coarse resin protection layer having a coarse surface on its outside is established on another face thereof. CONSTITUTION:A resin protection layer 3 is established on one face of the self coloring pressure sinsitive paper of which on the bearing material 2 a recording layer 1 is provided so that the outer face becomes smooth face, and a resin protection layer 4 is established on another face thereof so that the outer face becomes coarse face to prepare a pressure sensitive recording sheet A. Then, the adhesives of a low viscosity is applied to the coarse face of this pressure sensitive recording sheet A and dried to prepare the pressure sensitive recording sheet C having an adhesive face. Further, the pressure sensitive recording sheet A is piled in the same direction under this pressure sensitive recording sheet C to prepare a laminated pressure sensitive recording sheet E. Because the resin protection layer of a smooth face or a coarse face is operated as a peeling layer when this laminated pressure sensitive recording sheet is used, peeling paper is not required. Therefore, when copying in lamination, writing pressure is directly transmitted to the lower pressure sensitive recording sheet and the coloring property thereof can be improved. Further, because the upper and lower faces of coloring recording paper have the resin protection layer, the efficient contamination resistance effect, water resistance effect, chemicals resistance effect, outer contamination protection effect can be obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION (A) Industrial Application Field The present invention relates to a self-coloring recording sheet having a support and a guarantee layer capable of covering a recording layer on the front and back sides. ), dust intended for use in
Can be used as dust-free paper without the generation of fibers, pigments, dyes, or ink solvents.

Furthermore, it can be used as a recording sheet for documents such as slips, labels, memo paper, notebooks, etc. that can be used to record and preserve records without damaging them in the rain, in water, or in places where they may be wet by steam, sewage, organic solvents, etc. Can be used.

(B) Conventional technology Conventional dust-free recording sheets used in clean rooms include sheets made from long fibers of nokulpu that have been impregnated with papermaking oil, and so-called sheets made from synthetic paper. There is dust paper. Also known is a recording sheet which has a support coated with a color former and a color developer, and further has a protective layer made of melt-extruded polyolefin on the top surface. (For example, Japanese Patent Application Laid-Open No. 52-68513) Furthermore, a molten thin film of polyolefin is vacuum-adhered onto the self-coloring recording layer to form a peeling base layer, and a silicone resin solvent solution is applied onto the layer, followed by low-temperature drying and curing. Pressure-sensitive recording copying paper is known in which a peelable thin film is formed by applying a pressure-sensitive adhesive layer on the surface of the adhesive layer, and another pressure-sensitive recording paper is laminated and adhered on the layer [Japanese Patent Publication No. 10857/1984]. .

(C) Problems to be Solved by the Invention However, with this dust-free maple paper, it is difficult to completely suppress the separation of paper dust, fibers, and pigments. Pigment and ink components remain on the paper surface no matter whether you use a magic marker or a permanent marker.
a to escape. Although these problems have been somewhat improved in recording sheets with HJ made of melt-extruded polyolefin on the upper surface of the recording layer, separation of paper powder and fibers from the back side of the support can be suppressed. The stain resistance has not yet been satisfied.

A method in which the upper and lower surfaces of pressure-sensitive paper, which consists of a support and a recording layer, are sandwiched between larger protective layers can suppress the separation of paper dust, fibers, and pigments, but if both screens are made of a smooth resin protective layer, continuous recording will not be possible. When used as a commercial sheet, if a large number of sheets are stacked one on top of the other, a problem arises in which the sheets slip between the sheets and locking occurs, making them difficult to use. In addition, it is widely known that recording sheets made by applying adhesive to the back of pressure-sensitive recording paper are used for pasting slips, labels, etc., but when conventional paper-based pressure-sensitive paper is used, However, problems such as ``coloring fog'' easily occur due to the penetration of the adhesive. As a countermeasure, special treatments such as special adhesives and undercoating of pressure-sensitive paper were required. Furthermore, conventional pressure-sensitive paper with adhesive requires a release paper made of silicone resin or the like to prevent sticking before use, resulting in increased costs. Furthermore, when copying is performed by stacking a large number of sheets, there is a problem in that the release paper acts as a seal and reduces the print recording performance of the pressure-sensitive paper below the release paper. In order to avoid this problem of the adhesive properties of the release paper, if a pressure-sensitive paper with an adhesive is provided at the bottom of a series of pressure-sensitive sheets, the coloring of the pressure-sensitive paper will be I had the dilemma of being the lowest in a series of record sheets.

The purpose of the present invention is to have excellent stain resistance, water resistance, oil resistance, moisture resistance, heat resistance, light resistance and abrasion resistance, good color development when used, and moderate friction between sheets. To provide an inexpensive pressure-sensitive recording sheet with good releasability to adhesives.

(D) Means to Solve the Problem The invention was created to solve the above problem, and the self-coloring pressure-sensitive paper has a smooth resin protective layer on one side, and the other side has a rough outer surface. A pressure-sensitive recording sheet in which a rough resin protective layer forming a surface is fully submerged, a pressure-sensitive recording sheet with an adhesive surface provided with an adhesive layer on the back side of the resin storage layer of the pressure-sensitive recording sheet, and the pressure-sensitive recording sheet sheet and the pressure-sensitive recording sheet with adhesive surface If
This is a laminated pressure-sensitive recording sheet.

More specifically, (1) A pressure-sensitive recording sheet comprising a self-coloring pressure-sensitive paper with a smooth resin protective layer on the front surface and a rough resin protective layer with a rough outer surface on the back surface.

(2) A pressure-sensitive recording sheet in which a rough resin protective layer with a rough outer surface is provided on the surface of self-coloring pressure-sensitive paper, and a smooth resin protective layer is provided on the back surface.

(3) Pressure-sensitive recording in which a smooth resin protective layer is provided on the surface of self-coloring pressure-sensitive paper, and a rough resin protective layer with a rough outer surface and an adhesive layer in contact with the rough surface of the protective layer are provided on the back side. Sheet for use.

(4) A pressure-sensitive paper with a rough resin protective layer having a rough outer surface on the surface of the self-coloring pressure-sensitive paper, and a smooth resin protective layer and an adhesive layer in contact with the smooth surface of the protective layer on the back side. Recording sheet.

(5) Pressure-sensitive recording in which a smooth resin protective layer is provided on the surface of self-coloring pressure-sensitive paper, and a rough resin protective layer with a rough outer surface and an adhesive layer in contact with the rough surface of the protective layer are provided on the back side. Underneath the sheet, there is a smooth surface resin coating on the surface of the self-coloring pressure-sensitive paper. a/f
2, and a pressure-sensitive recording sheet having a roughened resin protective layer with a rough outer surface attached to the back side.

(6) A rough resin protective layer with a rough outer surface was provided on the surface of the self-coloring pressure sensitive paper, and a smooth resin coercive layer and an adhesive layer were provided on the back side in contact with the smooth surface of the protective layer. Under the pressure-sensitive recording sheet, there is a pressure-sensitive recording sheet with a rough resin protective layer on the surface of self-coloring pressure-sensitive paper, and a smooth resin protective layer on the back side. Pressure-sensitive recording sheet in close contact.

It is.

This invention will be explained based on the drawings.

FIGS. 1 and 2 are schematic diagrams showing the transverse surfaces of a pressure-sensitive recording sheet A and a pressure-sensitive recording sheet B, respectively, which are the basis of the present invention. Self-coloring pressure-sensitive paper has a recording layer (1) on a support (2), and this recording layer (1) has a two-layer structure in which layers containing a color forming agent and a color developer are stacked and encased. It may be of a one-layer structure, mixed and coated, or it may be dispersed in the support (2).

A printing section may be provided in advance on this self-coloring pressure sensitive paper.

A resin protective layer (3) is applied to one side of the self-coloring pressure-sensitive paper so that the surface exposed to the outside is a smooth surface, and a resin protective layer (4) is applied to the other side so that the surface exposed to the outside is a rough surface. is used as a pressure-sensitive recording sheet.

The rough surface resin protective layer (4) of the pressure-sensitive recording sheet prevents slippage and blocking even when a plurality of pressure-sensitive recording sheets are stacked one on top of the other.

The smooth surface resin protective layer (3) in the present invention can be easily created using a cooling roll, press roll, or heated finishing drum having a smooth surface when creating the resin protective layer surface.

Similarly, the rough-surfaced resin protective layer (4) in the present invention can be easily formed using a cooling roll or press roll with a rough surface when forming the surface of the resin protective layer, and a roll or heated finishing drum for molding.

The mh-retaining resin used in the method of the present invention may be any polyolefin, polystyrene, polyvinyl chloride, etc. as long as it can be melt-molded, and is not particularly limited. This is particularly advantageous from the point of view. The polyolefin resin in the present invention is
Homopolymers of olefins such as polyethylene and polypropylene, or copolymers of olefins of 2 or more olefins such as ethylene-propylene copolymers, and mixtures thereof. (abbreviated as MI) can be used alone or in combination.

In the resin used as the resin protective layer in the present invention, white pigments such as titanium oxide, zinc oxide, Merck, and calcium carbonate, aliphatic amides such as stearic acid amide and alaxic acid amide, zinc stearate, Aliphatic metal salts such as calcium stearate, magnesium stearate, and calcium palmitate, pigments and dyes such as ultramarine blue and cobalt violet, and various additives such as antioxidants, optical brighteners, ultraviolet absorbers, and antistatic agents. They may be added in appropriate combinations.

The thickness of the resin used as the resin protective layer in the present invention is about 5 to 200 μm, particularly about 5 to 100 μm.
Approximately μm is suitable.

The rough resin protective layer in the present invention has fine irregularities on the surface, and the shape thereof may be regular or irregular, and the average maintenance of the irregularities is about 0.1 to 100 μm.
The thickness is preferably about 5 to 80 μm. The average pitch of the unevenness is about 0.05 to 100 μm, and preferably about 0.1 to 40 μm.

The support used in the method of the present invention may be ordinary natural pulp paper, synthetic fiber paper, or so-called synthetic paper made of synthetic resin film, or may be a film made of synthetic resin, and its thickness is about 20 to 400 μm including the recording layer.

The pressure-sensitive recording sheet of the present invention can be used in combination with a sheet having an adhesive surface, and the smooth or rough resin protective layer surface of the pressure-sensitive recording sheet can be used as a release surface. The sheet having an adhesive surface may be the pressure-sensitive recording sheet having an adhesive surface of the present invention.

That is, two or more pressure-sensitive recording sheets of the present invention can be stacked and used with an adhesive layer provided between them. For example, a low-viscosity adhesive is applied to the rough surface of the pressure-sensitive recording sheet A prepared as shown in FIG. 1, and dried to create a pressure-sensitive recording sheet C (FIG. 3) having an adhesive surface. do.

Pressure-sensitive recording sheet C having an adhesive surface prepared in this way
A pressure-sensitive recording sheet A is superimposed under the pressure-sensitive recording sheet A in the same direction to form a laminated pressure-sensitive recording sheet E (Fig. 5), and the adhesive layer (5) of the laminated pressure-sensitive recording sheet E has an adhesive surface. The rough surface resin protection layer of sheet C/* (4) and the smooth surface resin protection layer (3) of the pressure-sensitive recording sheet will be sandwiched between them, but when both pressure-sensitive recording sheets are peeled off. It remains adhered to the rough resin protective layer (4) and does not transfer to the smooth resin protective layer (3). This is because the adhesive with a moderate viscosity is first applied to the resin protective layer (4) on the rough surface and dried, so the adhesive gets wet to the inside of the unevenness of the rough surface, increasing the adhesive area.
It is thought that the rough surface side acts as an adhesive surface and the smooth surface side acts as a release surface.

In addition, contrary to this method, an extremely viscous adhesive such as double-sided adhesive tape, which is already made into a sheet, is applied to the smooth surface resin protective layer (3) side of the pressure-sensitive recording sheet) B (Figure 2). Pressure-sensitive recording sheet D having an adhesive surface (Fig. 4)'
eCreate.

The pressure-sensitive recording sheet (2) having the adhesive surface is overlapped with the pressure-sensitive recording sheet (2) in the same direction to form a laminated pressure-sensitive recording sheet F (FIG. 6). When peeling both pressure-sensitive recording sheets in the laminated pressure-sensitive recording sheet F, the adhesive layer remains adhered to the smooth-surface resin protective layer (3) side, and the rough-surface protective layer (4) of the pressure-sensitive recording sheet B is peeled off. ) side. This is due to the high viscosity of the adhesive layer, which makes it impossible for the adhesive to wet the inside of the irregularities on the rough surface, and the adhesive area on the rough surface becomes extremely small, so the rough surface acts as the release surface and the smooth surface acts as the adhesive surface. it is conceivable that.

Incidentally, when producing a pressure-sensitive recording sheet having an adhesive surface, there is no problem in performing a pretreatment such as a corona discharge treatment on the surface to which the adhesive is applied.

CB) Effect The pressure-sensitive recording sheet having the smooth surface and the rough surface resin protective layer prepared as described above will not slip when stacked in multiple sheets due to the frictional action of the rough surface resin protective layer. and has the effect of preventing blocking. Further, the resin protective layer having a smooth surface or a rough surface has a peeling effect on the adhesive.

CF) Examples Example 1 A self-coloring pressure-sensitive recording paper (DiaSelf, manufactured by Mitsubishi Paper Mills @) with a basis weight of 60 f/cm and a width of 1345 m was run at a speed of 80 m/min, and the surface was subjected to corona discharge treatment in the first zone. , low density polyethylene (density 0.918P/i,
MI 5) 50 parts, high density anti-polyethylene (density 0
．． 9652 Taka, MI'7) was melt-extruded and coated with a width of 1355 m and a resin thickness of 30 μm, and a resin layer on the back side was formed using a cooling roll with a rough surface. After corona discharge treatment on the surface in the second zone, using a melt extruder, a polyethylene resin composition having the same composition as the back surface was melt-extruded coated with a width of 1355 mm and a resin thickness of 30 μm,
A surface resin layer is formed using a cooling roll with a smooth surface.

In this way, the self-coloring pressure sensitive paper has a smooth resin protective layer (3) on the recording layer (1) side and a rough resin protective layer (4) on the support (2) side. Recording sea) A was obtained (Figure 1).

Example 2 The same coating as in Example 1 was performed by reversing the recording layer side (1) and support side (2) of the self-coloring pressure-sensitive paper in Example 1 to coat the recording layer side (1) of the self-coloring pressure-sensitive paper. A pressure-sensitive recording sheet) B having a rough resin protective layer (4) and a smooth resin protective layer (3) on the support surface (2) was obtained (
Figure 2).

Example 3 An adhesive (CE753 manufactured by Konishi Co., Ltd.) was applied to the rough side of the pressure-sensitive recording sheet A prepared in Example 1 using a bar coater, and dried sufficiently to form a pressure-sensitive recording sheet with an adhesive surface (5). Obtain sheet C for fc (Fig. 3). pressure sensitive recording sheet with the adhesive surface) (4-7id pressure recording sheet A with the adhesive surface (5)
After superimposing the smooth surfaces (3) of the pressure-sensitive recording sheet and the pressure-sensitive recording sheet A so that they overlap to form a nine-layer pressure-sensitive recording sheet) EC Figure 5), mark the edges with a pencil, and then The pressure-sensitive recording sheet was peeled off. Peeling was performed well, and both pressure-sensitive recording sheets showed good color development, and no adhesive remained on the smooth surface (3) of the pressure-sensitive recording sheet underneath.

Moreover, the tackiness of the adhesive surface did not change before and after peeling, and the adhesive surface could be used satisfactorily as a recording sheet.

Example 4 Double-sided adhesive tape (manufactured by Sumitomo 3M Co., Ltd., 5cot) was applied to the smooth side of the pressure-sensitive recording sheet B prepared in Example 2.
(h) Double-sided adhesive tape) T-Packing: Pressure-sensitive recording sheet with adhesive surface) 1) was obtained (Figure 4). The pressure-sensitive recording sheet) D with an adhesive surface is laminated onto the pressure-sensitive recording sheet) B so that the adhesive surface (5) and the rough surface (4) of the pressure-sensitive recording sheet B overlap and are brought into close contact with each other. After preparing recording sheet F (FIG. 6), writing was performed from above with an iron pen, and both pressure-sensitive recording sheets were peeled off. Peeling was performed well, and both pressure-sensitive recording sheets showed good color development, and the double-sided adhesive tape always adhered to the smooth side and peeled off. Pressure-sensitive recording sheet on the bottom)B
No stickiness remained on the rough surface (4) side.

Moreover, the tackiness of the adhesive surface did not change before and after peeling, and the adhesive surface could be used satisfactorily as a recording sheet.

CG) Effects of the Invention The pressure-sensitive recording sheets prepared in Examples (1) and (2) of the present invention do not cause lateral slippage or blocking even when a large number of pressure-sensitive recording sheets are piled up and recorded. The present invention has the effect of preventing such lateral slip blocking.

When the pressure-sensitive emergency recording sheets with adhesive surfaces prepared in Examples (3) and (4) are stacked in large numbers and used as a laminated pressure-sensitive recording sheet, the smooth or rough resin protective layer acts as a release layer. There is no need for a release layer or release paper such as those coated with silicone resin, resulting in a cost reduction effect.

In addition, since no release paper is required, when making duplicate copies, the color pressure is not reduced by the release paper and is transmitted to the pressure-sensitive recording sheet below, which has the effect of improving color development. In addition, since a release paper is not required, when using multiple pressure-sensitive recording sheets and pressure-sensitive recording sheets with an adhesive surface, the pressure-sensitive recording sheet with an adhesive surface has the highest color development, which is of high importance. It can be easily installed at the top.

Further, since the pressure-sensitive recording sheet of the present invention has resin protective layers on the upper and lower surfaces of the self-coloring recording paper, it has excellent stain resistance, water resistance, chemical resistance, and external stain resistance.

[Brief explanation of drawings]

Figures 1 to 4 are cross-sectional views showing a part of the pressure-sensitive recording sheet of the present invention. B, FIG. 3 shows a pressure-sensitive recording sheet Cf provided with an adhesive layer, FIG. 4 shows a pressure-sensitive recording sheet D provided with an adhesive layer, FIG. 5 shows a laminated pressure-sensitive recording sheet E, FIG. 6 shows the bond layer pressure-sensitive recording sheet F. DESCRIPTION OF SYMBOLS 1...Recording layer, 2...Support, 3...Smooth surface resin protective layer, 4...Rough surface resin protective layer, 5...Adhesive layer 1st
Figure 3 Figure 2 Figure 4 Figure 6

Claims (6)

[Claims] (1) A pressure-sensitive recording sheet in which a smooth resin protective layer is provided on the surface of a self-coloring pressure-sensitive paper, and a rough resin protective layer with a rough outer surface is provided on the back surface. (2) A pressure-sensitive recording sheet in which a rough resin protective layer with a rough outer surface is provided on the surface of self-coloring pressure-sensitive paper, and a smooth resin protective layer is provided on the back surface. (3) Pressure-sensitive recording in which a smooth resin protective layer is provided on the surface of self-coloring pressure-sensitive paper, and a rough resin protective layer with a rough outer surface and an adhesive layer are provided on the back side in contact with the rough surface of the protective layer. Sheet for use. (4) A pressure-sensitive paper with a rough resin protective layer having a rough outer surface on the surface of the self-coloring pressure-sensitive paper, and a smooth resin protective layer and an adhesive layer in contact with the smooth surface of the protective layer on the back side. Recording sheet. (5) Pressure-sensitive recording in which a smooth resin protective layer is provided on the surface of self-coloring pressure-sensitive paper, and a rough resin protective layer with a rough outer surface and an adhesive layer in contact with the rough surface of the protective layer are provided on the back side. A pressure-sensitive recording sheet with a smooth resin protective layer on the surface of self-coloring pressure-sensitive paper under the recording sheet, and a pressure-sensitive recording sheet with a roughened resin protective layer on the back side with a rough outer surface. Recording sheet. (6) A pressure-sensitive paper with a rough resin protective layer having a rough outer surface on the surface of the self-coloring pressure-sensitive paper, and a smooth resin protective layer and an adhesive layer in contact with the smooth surface of the protective layer on the back side. Underneath the recording sheet, a pressure-sensitive recording sheet with a rough resin protective layer with a rough outer surface on the surface of self-coloring pressure-sensitive paper and a smooth resin protective layer on the back side is attached. Pressure recording sheet.