JP3717010B2 - Overlapping adhesive sheet and method for producing the same - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention is applied to leaf documents, cards, and various forms, and is a separate sheet superposition or a superposition adhesive sheet formed by folding a single sheet and bonding the superposed surfaces so as to be peeled off. More specifically, the present invention relates to a superposed adhesive sheet that can heat-print predetermined information on a sheet display surface side with a thermal printer and a method for producing the same.
[0002]
[Prior art]
Conventionally, in order to make the superposed surfaces peelable after bonding, both sides or one of the superposed surfaces is normally non-adhesive but can be bonded only when pressurized, but only weakly pressure-sensitive adhesive A structure provided with an agent layer is known. Various application technologies have been conceived based on this configuration. For example, Japanese Patent Application No. 5-171084 contemplates a technique in which a pressure-sensitive adhesive layer is provided on one of the overlapping surfaces and an adhesive force adjusting layer is provided on the other.
[0003]
On the other hand, in recent years, thermal printing technology using thermal coloring has been developed, and various thermal coloring agents, thermal coloring sheets or thermal printers have been developed. Recently, printing resolution has been improved, thermal printers have become smaller and higher performance. Was achieved. However, even the thermal printing technique thus improved has not been disclosed yet for the technique applied to the laminated adhesive sheet.
[0004]
[Problems to be solved by the invention]
The reason why the thermal printing technology is not applied to the overlay adhesive sheet is that this type of overlay adhesive sheet is used when a thermal printer is used to heat and print predetermined information on the exposed surface of the overlay sheet. Since the adhesive used is a pressure sensitive adhesive base based on an SBR or NBR emulsion type adhesive, it is necessary to go through a heat drying process when forming such a pressure sensitive adhesive layer. This is because there is a problem that the heat-sensitive color-developing sheet develops color due to heating and loses its product value.
[0005]
Therefore, the laminated adhesive sheet of the present invention forms a pressure-sensitive adhesive layer without undergoing a heating and drying step, and can heat-print predetermined information on the exposed surface of the laminated sheet with a thermal printer, and once bonded. It is an object of the present invention to provide a superposed adhesive sheet capable of neatly re-peeling the two sheets and a method for producing the same.
[0006]
[Means for Solving the Problems]
In order to solve the above-mentioned problems, the present inventors do not use the emulsion type pressure-sensitive adhesive that has been used in the pressure-sensitive adhesive base material of the conventional laminated adhesive sheet, but instead uses a solvent-type pressure-sensitive adhesive. If it is a weakly adhesive pressure-sensitive adhesive layer made of a pressure-sensitive adhesive obtained by mixing an adhesive base with a fine powder, it will have good conventional adhesive strength during pressure bonding Since it has a function capable of being peeled after bonding, and a pressure-sensitive adhesive layer can be formed without going through a heating and drying process, even if at least one of the superposed sheets is a heat-sensitive color developing sheet, there is nothing in the forming process. The present invention was conceived by finding that the above problem does not occur.
[0007]
That is, the overlapping adhesive sheet of the present invention is an overlapping adhesive sheet set in which the upper sheet and the lower sheet are detachably bonded through a weakly adhesive pressure-sensitive adhesive layer. Is a heat-sensitive color-developing sheet having a heat-sensitive color-developing recording part on its exposed surface, and the pressure-sensitive adhesive layer was obtained by mixing a pressure-sensitive adhesive base of a solvent-type pressure-sensitive adhesive and a fine powder. It is characterized by comprising a pressure sensitive adhesive.
[0008]
In particular, in the overlapping adhesive sheet of the present invention, the peelable, weakly adhesive pressure-sensitive adhesive layer is mixed at a ratio in the range of 5 to 50 parts by weight of fine powder with respect to 100 parts by weight of the solvent-based pressure-sensitive adhesive. It is characterized in that it is applied and formed with a dry coating amount in the range of 0.5 to 10 g / m ² .
[0009]
And, the method for producing the superposed adhesive sheet of the present invention is such that at least one of the two sheets is a thermosensitive coloring sheet, and the superposed surface of one of the superposed surfaces of the two sheets, After a peelable pressure-sensitive adhesive layer made of a solvent-type adhesive is applied and formed, the overlapping surfaces of the two sheets are brought into contact with each other and pressure-bonded with the peelable pressure-sensitive adhesive layer. It is characterized by.
[0010]
Hereinafter, the basic structure of the overlapping adhesive sheet of the present invention will be described in more detail based on (a) and (b) of FIG. First, as shown in FIG. 1 (a), a superposed adhesive sheet 1 of the present invention comprises an upper sheet 2 made of a heat-sensitive color developing sheet and a lower sheet 3 made of ordinary fine paper, and a superposed surface of the upper sheet 2. The pressure-sensitive adhesive layer 4 having a weak adhesive property provided on the surface of the pressure-sensitive adhesive layer 4 is bonded by pressure, and even after bonding, the interface peeling occurs at the boundary surface between the pressure-sensitive adhesive layer 4 and the lower sheet 3. Is possible. On the other hand, a thermosensitive color recording unit 5 is provided on the exposed surface of the upper sheet 2, and predetermined information is printed by a thermal printer. In the case where thermal color recording is also performed on the exposed surface of the lower sheet 3, the lower sheet 3 as well as the upper sheet 2 may be a thermal color developing sheet.
[0011]
Further, as shown in FIG. 1B, in the basic configuration of the superposed adhesive sheet of the present invention, the upper sheet 2 and the lower sheet 3 do not necessarily need to be separate bodies, and a predetermined area or entire surface of one side is sensed. One thermosensitive coloring sheet provided with a pressure adhesive layer may be folded in two and overlapped.
[0012]
Next, the peelable weak adhesive pressure-sensitive adhesive layer 4 will be described in detail. The pressure-sensitive adhesive constituting the pressure-sensitive adhesive layer 4 is a rubber-type, acrylic-type, silicone-type solvent-type pressure-sensitive adhesive as a pressure-sensitive adhesive base, and for the purpose of imparting peelability after pressure bonding. It is a mixture of fine powders. The solvent-type pressure-sensitive adhesive of the present invention includes rubber-based polymers such as styrene-butadiene rubber, natural rubber, and polyisobutylene rubber, copolymer acrylic polymers having 2-ethylhexyl acrylate as a basic monomer, rubber-like siloxane and resinous siloxane. It is formed by dissolving various polymers such as silicone polymer as the main component in a solvent such as tricrene, toluene, normal hexane, ethyl acetate, methyl ethyl ketone, and further adding additives such as tackifiers. Any of these are known and are commercially available. In particular, a solvent-based pressure-sensitive adhesive selected from acrylic or rubber is preferably used because it is excellent in practical aspects such as cost and processing as well as adaptability to a sheet.
[0013]
The fine powder mixed with the pressure-sensitive adhesive base has non-new properties with respect to the pressure-sensitive adhesive base, for example, silica, starch, zinc oxide, titanium oxide, calcium carbonate, Examples include kaolin, activated clay, and spherical alumina. In consideration of the peelability after pressure bonding, the uniform coefficient n of the Rosin-Rammler uniform number is preferably in the range of 1.0 to 2.6. Particularly preferred is a porous material having a specific surface area measured by the BET method of 70 to 270 m ² / g. In particular, in consideration of adhesive strength, peelability, and other practicalities, fine powder silica and fine powder starch can be suitably used.Further, a mixture of these can be obtained by adjusting the mixing ratio, It has been found that it is more suitable because the peelability can be easily adjusted.
[0014]
The mixing ratio of the fine powder with respect to the pressure-sensitive adhesive base is 5% with respect to 100 parts by weight of the pressure-sensitive adhesive base in consideration of adhesive strength, peelability, blocking property, surface strength, and the like. It needs to be in the range of -50 parts by weight, preferably in the range of 10-30 parts by weight, more preferably in the range of 15-25 parts by weight.
[0015]
The method for producing a superposed adhesive sheet of the present invention comprises applying the peelable pressure-sensitive adhesive prepared as described above to the superposed surface of one sheet mainly by a gravure offset printing method, and a heat drying step. After the pressure-sensitive adhesive layer is formed without passing through, the overlapping surfaces of the two sheets are brought into contact with each other, pressurized at a predetermined pressure, and bonded with the pressure-sensitive adhesive layer. The dry coating amount of the pressure-sensitive adhesive layer depends on the pressure (50 to 200 kg / cm ² ) at the time of pressure bonding with a dry sealer and the degree of adhesiveness and peelability of the prepared pressure-sensitive adhesive. is suitably in the range of 0.5 to 10 g / m ^2, preferably in the range of 5-6 g / m ^2.
[0016]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, as a preferred embodiment of the overlapping adhesive sheet of the present invention, a case where the present invention is applied to a delivery slip will be described with reference to the accompanying drawings. 2 is a schematic perspective view of the superposed adhesive sheet, FIG. 3 is a cross-sectional view taken along the line AA of FIG. 1, and FIG. 4 is an explanatory view of a peeled state of the upper sheet and the lower sheet in FIG.
[0017]
As shown in FIGS. 2 and 3, the overlapping adhesive sheet 11 of this embodiment has a weak adhesion in which the upper sheet 12 a serving as a delivery slip and the upper sheet 12 b serving as a pasting slip connected by a sewing machine line M have the above-described configuration. A normal permanent adhesive 17 is applied to the entire rear surface of the lower sheet 13 covered with the release paper 18 through the adhesive pressure-sensitive adhesive layer 14 so as to be peelable. Has been.
[0018]
On the exposed surfaces of the upper sheet 12a and the upper sheet 12b made of a heat-sensitive color developing sheet, a receiver color printing column, a requester printing column, a product name printing column, a reception date printing column, etc. In this portion, predetermined thermal recording information 20 is printed by a thermal printer. In addition, notation information 19 such as titles such as “delivery slip” and “pasting slip”, a delivery trader display, and a bar code are provided in advance.
[0019]
As shown in FIG. 4, the use example of the overlapping adhesive sheet after the thermal recording information 20 is applied to the thermal coloring recording unit 15 is as follows. As shown in FIG. The upper sheet 12a is separated from the lower sheet 13 when handing over the delivery goods to the recipient, and the recipient's seal is stamped in the stamping column of the upper sheet 12a. The delivery work is completed by taking home the upper sheet 12a. On the other hand, the upper sheet 12b, which is a sticker, is left as it is without being peeled off.
[0020]
In addition, notification information 16 such as a greeting from the delivery company and service guidance is applied to a portion where the lower sheet 12a on the surface of the lower sheet 13 is overlapped, and this notification information 16 is hidden by the upper sheet 12a. The upper sheet 12a and the lower sheet 13 are separated from each other.
[0021]
【The invention's effect】
As described above, according to the overlay adhesive sheet of the present invention and the method for producing the same, in the overlay adhesive sheet including the thermosensitive coloring sheet, the pressure-sensitive adhesive layer is not subjected to the heat drying step on the overlap surface. As a result, it is possible to heat and print predetermined information on the exposed surface of the overlapped sheet with a thermal printer, and to re-peel the two sheets once bonded.
[Brief description of the drawings]
FIG. 1 is a schematic cross-sectional explanatory view of a basic configuration of an overlapping adhesive sheet of the present invention.
FIG. 2 is a schematic perspective view of a superposed adhesive sheet in which the present invention is applied to a delivery slip.
3 is a cross-sectional view taken along line AA in FIG.
FIG. 4 is an explanatory diagram of a peeling state between the upper sheet and the lower sheet in FIG. 1;
[Explanation of symbols]
1, 11 Superposed adhesive sheets 2, 12a, 12b Upper sheet 3, 13 Lower sheet 4, 14 Peelable weak adhesive pressure-sensitive adhesive layer 5, 15 Thermal coloring recording unit 16 Notification information 19 Notation information 20 Thermal recording information

Claims (3)

A laminated adhesive sheet in which two sheets are bonded through a weakly adhesive pressure-sensitive adhesive layer that can be peeled, and at least one of the two sheets has a thermosensitive color recording part on its exposed surface. The pressure-sensitive adhesive layer is a pressure-sensitive adhesive obtained by mixing a pressure-sensitive adhesive base of a solvent-type pressure-sensitive adhesive and a fine powder. A superposed adhesive sheet. With the adhesive formed by mixing the peelable, weakly adhesive pressure-sensitive adhesive layer in a ratio of 5 to 50 parts by weight of fine powder with respect to 100 parts by weight of the solvent-type pressure-sensitive adhesive, the dry coating amount is 0 2. The laminated adhesive sheet according to claim 1, which is applied and formed in a range of 0.5 to 10 g / m < ² >. A peelable pressure-sensitive adhesive layer made of a solvent-type pressure-sensitive adhesive on one of the two sheets of the overlapping surface of at least one of the two sheets, wherein at least one of the two sheets is a thermosensitive coloring sheet. A method for producing a superposed adhesive sheet, comprising: applying and forming a film; and bringing the superposed surfaces of two sheets into contact with each other and pressure-adhering with the peelable pressure-sensitive adhesive layer.

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