JP4270800B2 - Manufacturing method of adhesive sheet - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for producing a pressure-sensitive adhesive sheet in which a non-tacky pattern is formed on a pressure-sensitive adhesive layer of a pressure-sensitive adhesive sheet, thereby making it possible to produce a pressure-sensitive adhesive sheet with controlled adhesion.
[0002]
[Prior art]
Since the pressure-sensitive adhesive sheet is one in which the pressure-sensitive adhesive is previously applied to the sheet-like material, there is an advantage that it is released from the trouble of applying the adhesive each time when the sheet-like material is attached to the adherend, It is used for various purposes.
[0003]
However, a general pressure-sensitive adhesive sheet is formed with a pressure-sensitive adhesive layer having a uniform and relatively strong pressure-sensitive adhesive, so that even if it is suitable for being applied with a uniform adhesive force on an adherend, When we wanted to change the adhesive strength intentionally, it was difficult to deal with.
[0004]
For example, when it is desired to reduce the adhesiveness of the entire pressure-sensitive adhesive sheet, it is necessary to change the pressure-sensitive adhesive composition for forming the pressure-sensitive adhesive layer. It is necessary to manufacture a sheet. Moreover, when it is not desired to adhere a part of the pressure-sensitive adhesive sheet to the adherend, it is necessary to partially remove the adhesive force by pasting a film or the like having a predetermined shape on a part of the pressure-sensitive adhesive layer in advance. Furthermore, when trying to reduce the adhesiveness of a part of the pressure-sensitive adhesive sheet, it requires work such as spraying non-adhesive powder onto a part of the pressure-sensitive adhesive layer, and the adhesiveness changes depending on the degree of spraying. difficult.
[0005]
[Problems to be solved by the invention]
Accordingly, in the present invention, the above-mentioned drawbacks of a general pressure-sensitive adhesive sheet, that is, the control of the adhesiveness of the whole pressure-sensitive adhesive sheet is required by changing the pressure-sensitive adhesive composition constituting the pressure-sensitive adhesive layer, If you do not want to attach a part of the adhesive to the adherend, you must apply a film of a predetermined shape to the adhesive layer in advance, or if you want to reduce the adhesiveness of a part of the adhesive sheet, It is intended to solve the problem of requiring a work such as spraying the powder with the property of being dispersed in a part of the pressure-sensitive adhesive layer.
[0006]
[Means for solving the problems]
The inventor forms an ordinary pressure-sensitive adhesive layer, and forms a non-adhesive pattern on the pressure-sensitive adhesive layer by transfer. It was possible to eliminate the various disadvantages.
[0007]
The first invention is a non-adhesive pattern layer transfer sheet in which a non-adhesive pattern layer containing a foaming agent is formed on the peelable surface of a peelable substrate, and the adhesive layer is laminated on the surface of the sheet-like substrate. to have been the pressure-sensitive adhesive layer of the laminated sheet by pressure bonding superposed as non-tacky patterned layer side containing the blowing agent is in contact, non-adhesive containing the blowing agent in the pressure-sensitive adhesive layer A non-adhesive pattern containing the foaming agent that is transferred onto the pressure-sensitive adhesive layer by peeling off the peelable substrate. After pasting the layer side to the adherend, it is possible to foam only the non-tacky pattern layer containing the foaming agent by heating and to peel from the adherend by reducing the adhesive strength. The manufacturing method of the pressure-sensitive adhesive sheet Is shall. A second invention is characterized in that, in the first invention, the pattern part of the non-adhesive pattern layer comprises a plurality of types having different area ratios, or has a changing part in which the area ratio changes. The present invention relates to a method for producing an adhesive sheet. 3rd invention is related with the manufacturing method of the adhesive sheet in which the said adhesive sheet before sticking to a to-be-adhered body peels the said peelable base material in 1st or 2nd invention. A fourth aspect based on the third aspect, the adhesive sheet before being affixed to the adherend after peeling off the releasable substrate is laminated to another release substrate and the release substrate The present invention relates to a method for producing a pressure-sensitive adhesive sheet.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
The manufacturing method of the present invention will be described with reference to FIG. First, as shown in the lower part of FIG. 1A, a laminate in which an adhesive layer 3 is laminated on a sheet-like substrate 2 that can be a substrate of an adhesive sheet is prepared. As shown above a), a non-adhesive pattern layer transfer sheet (hereinafter also simply referred to as a transfer sheet) in which a non-adhesive pattern layer 6 is formed on the peelable surface 5 of the peelable substrate 4 is prepared.
[0009]
Next, as shown in FIG. 1B, the transfer sheet is overlaid on the pressure-sensitive adhesive layer 3 of the laminate so that the non-adhesive pattern layer side of the transfer sheet is in contact with the laminate, The sheet is pressed and a non-adhesive pattern layer is laminated on the adhesive layer 3. If necessary, it may be accompanied by heating and is preferably performed using a press using a roller or a flat plate. In this state, the peelable substrate 4 is also laminated on the pressure-sensitive adhesive layer 3 to form the pressure-sensitive adhesive sheet 1 with the peelable substrate 4. In the present invention, the non-adhesive pattern layer 6 is laminated on the pressure-sensitive adhesive layer 3 laminated on the sheet-like substrate 2 by transfer using a transfer sheet. As in printing, there is an advantage that the adhesiveness of the pressure-sensitive adhesive layer 3 does not hinder the formation of the non-adhesive pattern layer 6.
[0010]
The pressure-sensitive adhesive sheet 1 may be made as the pressure-sensitive adhesive sheet 1 ′ (FIG. 1C) in a state where the peelable substrate 4 is peeled after being manufactured as described above. In this case, if the surface of the sheet-like substrate 2 opposite to the side having the pressure-sensitive adhesive layer 3 is made peelable, the pressure-sensitive adhesive sheet 1 ′ can be wound up. If the peelable substrate 4 has been peeled off in advance, there is no inconvenience of discarding the peelable substrate 4 every time it is applied to the adherend. Or what constitutes a transfer sheet as shown in Drawing 1 (d) on adhesive layer 3 containing non-adhesive pattern layer 6 after exfoliating exfoliation substrate 4 of adhesive sheet 1 Another peelable substrate 4 ′ may be laminated. The peelable substrate for the transfer sheet is thin for convenience of printing, etc., so the function of protecting the adhesive layer may be insufficient, but in the case of the peelable substrate 4 ′ to be laminated later, This is because it is not necessary to be suitable for printing, and the protective function can be enhanced by increasing the thickness.
[0011]
The non-adhesive pattern layer 6 is a non-adhesive material formed in a pattern on the pressure-sensitive adhesive layer 3. For example, as shown in FIG. It consists of pattern elements, and is arranged at regular intervals in the vertical and horizontal directions (in the example shown in the figure, the vertical arrangement pitch is equal to the horizontal arrangement pitch). The pitch of the arrangement is arbitrary, but as an example, it is about 0.1 mm to 5 mm.
[0012]
FIG. 2A shows a state in which the non-adhesive pattern layer 6 is laminated on a part of the center of the pressure-sensitive adhesive layer 3, but the position where the non-adhesive pattern layer 6 is formed is arbitrary, and the pressure-sensitive adhesive layer 3 may be formed on either the left or right or upper and lower halves of 3 or only on the peripheral edge. Of course, the non-adhesive pattern layer 6 may be formed on the entire surface of the adhesive layer 3.
[0013]
Each pattern element of the non-adhesive pattern layer 6 is not limited to a circle as in the illustrated example, and may have various geometric shapes and other shapes. Further, if the pattern of the non-adhesive pattern layer 6 (the aggregate in which the pattern elements are arranged) is a positive pattern, the pattern corresponding to the negative pattern is also the pattern of the non-adhesive pattern layer 6. Can be used as Therefore, the pattern may not be a pattern in which each pattern element is arranged at intervals, but may be a continuous pattern.
[0014]
When each pattern element is a pattern having a certain gap as described with reference to FIG. 2A, if the area ratio of the pattern in a portion where the pattern exists is large, the non-pattern having such a pattern is present. Since the area ratio of the exposed portion of the pressure-sensitive adhesive layer 3 covered with the pressure-sensitive adhesive pattern 6 is reduced, the pressure-sensitive adhesive force of the pressure-sensitive adhesive layer as a whole can be reduced.
[0015]
In the example described with reference to FIG. 2A, the pattern portion of the non-adhesive pattern layer 6 has a certain area ratio. As shown in FIG. 2B, the area ratio of the pattern portion may change. In the example shown in FIG. 2B, each row (in the figure, indicates an arrangement in the vertical direction) is composed of circular pattern elements having the same diameter, and the circle on the right side in the figure is the diameter of the circle of each pattern element. Therefore, in the direction from the left side toward the right side, the area ratio decreases, that is, there is a change portion where the area ratio changes. In the area where the area ratio changes in this way, for example, the area on the left side, that is, the area area with a larger area ratio has a low adhesive force with the adherend and is easy to peel off, but the area ratio on the right side is small. On the other hand, since the adhesive force with the adherend is high and a large force is required for peeling, for example, a part having a large area ratio on the left side can be used as a trigger for peeling.
[0016]
In FIG. 2 (b), the adhesive layer 3 having the change part 7 at a part of the center is shown, but the position where the change part 7 is formed is arbitrary, and either the left or right or upper and lower sides of the adhesive layer 3. It may be formed in such a half, may be formed only on the peripheral edge portion, or may be formed on the entire surface of the pressure-sensitive adhesive layer 3. Further, the change in the area ratio of the change portion is not limited to increase or decrease, but may be a combination of them.
[0017]
As shown in FIG. 2C, the non-adhesive pattern layer 6 may be formed by arranging a plurality of areas having different area ratios. In the example shown in FIG. 2C, rectangular sections 8a, 8b, and 8c that are long in the vertical direction are arranged in order from the left. In the central section 8b, the area ratio is large, and the left and right sections 8a, In 8c , the area ratio is small, and in the areas 8a and 8c , the area ratio is equal. In this illustrated example, the left and right sections 8a, and the 8 c, the adhesive strength to an adherend is relatively large, the central zone 8b, since the adhesive force to an adherend is relatively small, e.g. In accordance with the central area 8b, the sheet-like base material 2 is cut with a broken line or the like, and after the adhesive sheet is applied to the adherend, the adhesive sheet corresponding to the area 8b is peeled off. Can be used for applications.
[0018]
Even in the case of a plurality of areas having different area ratios, the area ratio in each area and the position where the area is arranged can be arbitrarily determined.
[0019]
In addition, the formation of a portion having a constant area ratio, formation of a change portion, or formation of a plurality of areas having different area ratios described with reference to FIGS. 2A, 2B, and 2C is the same. The adhesive sheet can be arbitrarily combined.
[0020]
The sheet-like base material 2 is prepared separately from the adherend, and may be a sheet-like one that needs to be applied on the adherend by applying an adhesive or a pressure-sensitive adhesive. Anything can be used. Industrially, the sheet-like substrate 2 is preferably one that can be supplied and handled in the form of a roll, and if it is a common one, it is a sheet of paper, plastic sheet, or metal foil. In addition, non-woven fabrics, cloths, other fibrous sheets, or sheets such as single plates obtained by thinly slicing wood can be used. Among the above, the plastic sheet may be colorless and transparent, colored and transparent, or opaque.
[0021]
These various sheets may be used alone or as a composite sheet bonded together in any combination, part or all of which is reinforced by painting or resin impregnation, etc. Also good. Although the thickness of the sheet-like base material 2 changes also with a raw material and a use, it is about 5 micrometers-500 micrometers, More preferably, it is about 20-300 micrometers. Moreover, when flexibility is not requested | required, an upper limit can be made still thicker and is several mm, for example, about 5 mm or less.
[0022]
The pressure-sensitive adhesive sheet 1 is used to coat the surface of the adherend and determines the appearance of the adherend. Therefore, depending on the use of the adherend, an aesthetic appearance may be required. In such a case, as the sheet-like base material 2, it is preferable to use a material having an aesthetic appearance with a color, a pattern, or unevenness as required.
[0023]
Similarly, since the pressure-sensitive adhesive sheet 1 can determine the physical or chemical properties of the surface of the adherend, the pressure-sensitive adhesive sheet 1 has necessary properties according to the use of the adherend. May be preferred. As such properties, various properties such as scratch resistance, anti-contamination properties, anti-fogging properties, heat insulation properties, anti-reflection properties, anti-static properties, or electromagnetic wave shielding properties, magnetic properties, fluorescence emission, etc. It may be various properties such as properties, moisture absorption / release properties, infrared or ultraviolet reflectivity or absorbability, antibacterial properties, and antifungal properties. In order to impart these properties, the sheet-like substrate 2 may be selected by a method such as selecting a material having these properties or laminating a resin layer kneaded with a substance having those properties by coating or the like. That's fine.
[0024]
As the pressure-sensitive adhesive composition constituting the pressure-sensitive adhesive layer 3, a rubber-based or acrylic-based or silicone-resin-based one using acrylic acid or acrylic acid ester as a starting material is used, which is suitable for coating. Using what was prepared so that it might become a viscosity, it forms using roll coating or knife coating etc. which are well-known coating methods. The thickness of the pressure-sensitive adhesive layer 3 is preferably 10 μm to 100 μm at the stage of drying after application, and if it is less than 10 μm, the adhesive strength by the pressure-sensitive adhesive layer 3 itself when the pressure-sensitive adhesive sheet 1 is pasted on the adherend is obtained. It is insufficient, and if it exceeds 100 μm, no improvement in adhesion is observed.
[0025]
The non-adhesive pattern layer transfer sheet used in the present invention is prepared as a non-adhesive pattern layer 6 laminated on the peelable surface 5 of the peelable substrate 4.
[0026]
As long as the material which comprises a base material has releasability, the base material alone may be sufficient as the peelable base material 4, and when the material which comprises a base material does not have peelability, or when peelability is scarce Alternatively, the substrate may be a laminate of a peelable layer. In the case where the former material constituting the base material has releasability, a releasable plastic film such as a film of polyolefin resin such as polyethylene or polypropylene or a film of polyethylene terephthalate resin can be used. .
[0027]
As the base material having a peelable layer laminated on the latter base material, any plastic film, paper, or metal foil or other film-like or sheet-like material is used as the base material other than the above-described peelable plastic film. It is also possible to use a laminated sheet composed of a plurality of layers arbitrarily combined, and the surface of these base materials has adhesiveness to the base material and is non-tacky pattern layer 6 For example, a laminate of peelable layers having peelability can be used.
[0028]
The peelable layer is made of a peelable resin such as a fluorine-based resin or a silicone resin, or a peelable resin such as these peelable resins or wax is dissolved or dispersed in a binder resin. It can be formed by coating or printing by a known method using a coating composition or ink composition obtained by dissolving or diluting them with a solvent or a dispersant. The thickness of the peelable layer is preferably about 0.5 μm to 10 μm.
[0029]
The non-adhesive pattern layer 6 is composed of, for example, a non-adhesive resin alone or as a main component, specifically, using a binder resin used for general paint or ink, Or it is comprised from what was kneaded with the pigment and other additives. When it is necessary to prevent penetration of the pressure-sensitive adhesive layer, it is preferable to use a thermosetting resin, an ionizing radiation curable resin, or the like as a binder resin. When forming the non-adhesive pattern layer 6, it can be formed by printing by a known printing method using an ink composition obtained by further dissolving or diluting with a solvent or diluent. Curing by heating or irradiation with ionizing radiation. The thickness of the pattern portion is preferably about 0.1 μm to 5 μm.
[0030]
The non-adhesive pattern layer 6 can also be formed as a foaming pattern. The foaming pattern can be formed by using a foaming agent contained in the binder resin of the ink composition for forming the non-adhesive pattern layer 6 described above. As the blowing agent, any of inorganic and organic ones can be used, but azo compounds such as azodicarbonamide, azobisisobutylnitrile, or diazobenzene, paratoluenesulfonyl hydrazide, or 4,4-oxybisbenzenesulfonyl. Use of organic compounds such as azide compounds such as hydrazide, or nitroso compounds such as nitrosopentamethylenetetramine or N, N-dinitrosotephthalamide, the foaming temperature is not too high, and the dispersibility is good Is preferable. Moreover, as the foaming agent, a microcapsule type foaming agent containing a low boiling point solvent can be used.
[0031]
After the pressure-sensitive adhesive sheet 1 having the non-adhesive pattern layer 6 formed as a foaming pattern is attached to an adherend, heating is performed by an appropriate means such as heating or irradiation with ionizing radiation, and foaming is performed by foaming the foamable pattern. Since the volume of the adhesive pattern increases and the space between the adherend and the pressure-sensitive adhesive layer 3 of the pressure-sensitive adhesive sheet 1 is expanded, there is an advantage that the pressure-sensitive adhesive sheet 1 and the adherend are easily peeled off. When the pressure-sensitive adhesive sheet 1 that is firmly adhered to the body and difficult to peel is peeled off, there is an advantage that it is possible to make the peeling easy by reducing the adhesive force.
[0032]
【The invention's effect】
According to the invention of claim 1, since the non-adhesive pattern layer is laminated on the pressure-sensitive adhesive layer laminated on the sheet-like base material by transfer using the transfer sheet, the pattern of the non-adhesive pattern layer is changed. It is possible to provide a method for producing a pressure-sensitive adhesive sheet that facilitates the formation of a non-tacky pattern layer for controlling the pressure-sensitive adhesive property or eliminating the adhesiveness of the pressure-sensitive adhesive sheet. Furthermore, since the non-adhesive pattern layer is a foamable pattern layer, it is possible to cause a decrease in adhesive force by taking appropriate measures such as heating when peeling after sticking to an adherend. The manufacturing method of the adhesive sheet can be provided. According to the invention of claim 2 , in addition to the effect of the invention of claim 1, the portions of the non-adhesive pattern layer are made of a plurality of types having different area ratios so that portions having different adhesive forces coexist. A method for producing a pressure-sensitive adhesive sheet, which allows the adhesive force to have a predetermined change depending on a place, by having a change part in which the area ratio changes. Can be provided. According to the invention of claim 3 , in addition to the effect of the invention of claim 1 or 2 , a process of peeling the peelable substrate is added, so that the peeled peeled off when being attached to the adherend It is possible to provide a method for producing a pressure-sensitive adhesive sheet that makes it possible to eliminate the inconvenience of discarding a conductive substrate. According to the invention of claim 4 , in addition to the effect of the invention of claim 3 , a process of laminating another peelable substrate is added, so that the adhesive layer of the adhesive sheet is more reliably protected. The manufacturing method of the adhesive sheet which makes it possible can be provided.
[Brief description of the drawings]
FIG. 1 is a diagram showing a method for producing an adhesive sheet.
FIG. 2 is a view showing a pattern of a non-adhesive pattern layer of an adhesive sheet.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Adhesive sheet 2 Sheet-like base material 3 Adhesive layer 4 Peelable base material 5 Peelable surface 6 Non-adhesive pattern layer

Claims (4)

The non-adhesive pattern layer transfer sheet in which the non-adhesive pattern layer containing the foaming agent is formed on the peelable surface of the peelable substrate, and the laminated sheet in which the adhesive layer is laminated on the surface of the sheet-like substrate. On the pressure-sensitive adhesive layer, the non-sticky pattern layer containing the foaming agent is laminated on the pressure-sensitive adhesive layer by laminating and pressing so that the non-sticky pattern layer side containing the foaming agent is in contact with the adhesive layer. A non-adhesive pattern layer side containing the foaming agent transferred to the pressure-sensitive adhesive layer by peeling off the peelable base material. Of the pressure-sensitive adhesive sheet, wherein the pressure-sensitive adhesive sheet can be peeled off from the adherend by reducing the adhesive force by foaming only the non-tacky pattern layer containing the foaming agent by heating . Production method. The method for producing a pressure-sensitive adhesive sheet according to claim 1, wherein the pattern part of the non-adhesive pattern layer includes a plurality of types having different area ratios or has a changing part in which the area ratio changes . The manufacturing method of the adhesive sheet of Claim 1 or 2 in which the said adhesive sheet before affixing on a to-be-adhered body peels the said peelable base material . The pressure-sensitive adhesive sheet according to claim 3, wherein the pressure-sensitive adhesive sheet before being attached to an adherend is formed by laminating a peelable substrate different from the peelable substrate after peeling the peelable substrate. Manufacturing method.

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