KR102035535B1 - Baseless double-sided adhesive tape and method of producing the same, and adhesive roll and method of producing the same - Google Patents

Abstract

Provided is a substrateless double-sided pressure-sensitive adhesive tape in which occurrence of adhesion is suppressed.
A light peeling sheet, a baseless adhesive layer, and a heavy peeling sheet are provided, and the peeling surface of the said light peeling sheet is in contact with one main surface in the said baseless adhesive layer, and the peeling surface of the said heavy peeling sheet is in contact with the other main surface. as a base material-less double-sided pressure-sensitive adhesive tape of a long, and the peel force (F _L) and the peel force (F _H) of the jungbak Lee sheet of the hard release sheet satisfies the following formula (1),
F _H -F _L ≥10mN / 50mm (1)
The main surface of the peeling agent layer side in the said light peeling sheet is equipped with the adhesive free area | region which is an area | region in which the said base material adhesive layer is not laminated | stacked in the width direction both ends.

Description

BASELESS DOUBLE-SIDED ADHESIVE TAPE AND METHOD OF PRODUCING THE SAME, AND ADHESIVE ROLL AND METHOD OF PRODUCING THE SAME

The present invention relates to a baseless double-sided adhesive tape.

A baseless double-sided adhesive tape is formed by laminating a long, light peeling sheet and a long, heavy peeling sheet on each of both sides of a long pressure-sensitive adhesive layer. Since the said adhesive layer does not have the base material (core material) used as a support body, in this specification, it is called "substrateless adhesive layer."

After peeling off and removing a light peeling sheet, such a base material-less double-sided adhesive tape affixes one surface of the exposed base material adhesive layer to a to-be-adhered body, peels and removes a heavy peeling film next, and exposes the base material adhesive by it Another adherend is affixed on the other surface of a layer, and adherends are bonded together.

Although the base-less double-sided adhesive tape may be stored extended in the elongate direction, in many cases, it is stored as a winding body wound in roll shape, and is marketed in this state. A different type of release sheet is in contact with each of the main surfaces of the baseless pressure-sensitive adhesive layer of the base material double-sided pressure-sensitive adhesive tape in this winding body. The base-pressure pressure-sensitive adhesive layer has a pressing force based on the tension during winding work. Is in the state given by.

In addition, in this specification, a "main surface" means two opposing surfaces with the largest area among the surfaces constituting the member having a sheet shape (a specific example may be a baseless adhesive layer or a release sheet.). . The main surface in a baseless adhesive layer is a surface used as a sticking surface, and the main surface in a peeling sheet is the surface in which a baseless adhesive layer is formed, and the surface on the opposite side (opposing surface).

As a problem with the baseless double-sided adhesive tape, when peeling the light peeling sheet, peeling from the light peeling of the baseless pressure-sensitive adhesive layer is not performed appropriately, and part of the baseless pressure-sensitive adhesive is caused by cohesive failure of the baseless pressure-sensitive adhesive layer. The peeling defect (also called "residual phenomenon" in this specification.) Also called what is single bonding which a layer remains on a hard peeling sheet is mentioned. Conventionally, in order to suppress this adhesion, the method of changing the peeling force of each peeling sheet by changing the composition of the peeling agent layer in two types of peeling sheets which contact | connect a base material adhesive layer has been performed (for example, patent document 1). .

[Patent Document 1] Japanese Patent Application Laid-Open No. 2010-168425

However, according to the method of adjusting the composition of a release agent layer in this way, it is necessary to optimize the composition of a release agent layer individually according to the composition of a base material adhesive layer. In addition, as mentioned later, an adhesion may not necessarily be suppressed only by adjusting the composition of a releasing agent layer.

Here, an object of this invention is to provide the new means which suppresses adhesion in a base material double sided adhesive tape efficiently.

As a result of examining the single bond by the present inventors, the following knowledge was acquired.

In addition, in this specification, the winding direction in the case where winding is performed as a direction in the main surface of a baseless double-sided adhesive tape is called a long direction, and the direction in the main surface orthogonal to this long direction is called a width direction. And the direction orthogonal to both a long direction and a width direction is called cross section direction.

(A) There are two types of single adhesion.

i) spot adhesion

It is a single bond which mainly arises in the area | regions other than the width direction edge part of a base material adhesive layer, and arises when the difference of the peeling force of the light peeling sheet which clamps a base material adhesive layer and the peeling force of a heavy peeling sheet is small. A substrateless double-sided pressure-sensitive adhesive tape in which spot adhesion has occurred is conceptually shown in FIG. 9. As shown in Fig. 9 (a) and (b), when the light peeling sheet 51 of the baseless double-sided adhesive tape 50 is peeled off from the baseless adhesive layer 52, the light peeling sheet 51 and the heavy foil are peeled off. As the space | interval of the lee sheet 53 spreads, the adhesive composition 52a which comprises the baseless adhesive layer 52 is extended between these sheets. A part thereof is not peeled off at the interface between the light peeling sheet 51 and the base material pressure-sensitive adhesive layer 52, but is cohesively broken within the adhesive composition 52a. At this time, the adhesive composition 52a located in the light peeling sheet 51 side rather than a fracture | rupture part remains on the light peeling sheet 51, and becomes a spot-shaped residual adhesive 52b.

In addition, in this specification, "the peeling force of a light peeling sheet" is a light peeling sheet of 38 micrometers in thickness, the baseless adhesive layer of 25 micrometers thickness laminated | stacked on the peeling surface of this light peeling sheet, and the light peeling of this baseless adhesive layer. The light peeling force measuring laminate whose length in the width direction (it is also called "expansion" here) which consists of a heavy peeling sheet of thickness 38 micrometers laminated | stacked so that the peeling surface may face to the surface opposite to a sheet | seat is 50 mm laminated body. The peeling force at the time of peeling a light peeling sheet | seat by the 180 degree pulling-out method from the conditions of 23 degreeC relative humidity 50% from is meant. In addition, "the peeling force of a heavy peeling sheet" uses the heavy peeling force measuring laminated body obtained by replacing the light peeling sheet in the said light peeling force measuring laminated body with the polyester film of thickness 25micrometer, 23 The peeling force at the time of peeling a heavy peeling sheet by 180 degree pulling-out method on the conditions of 50 degreeC relative humidity is meant. In addition, the measuring method of this peeling force is demonstrated in detail in the test example 1 of an Example including the manufacturing method of a laminated body for a measurement.

ii) end attachment

End danchak is, as being generated in the region of the width direction end portion vicinity of the substrate-less pressure-sensitive adhesive layer, is considered to be caused by the following reason. In other words, as shown in FIG. 10, the baseless pressure-sensitive adhesive layer 62 of the baseless double-sided pressure-sensitive adhesive tape 60 is in the cross-sectional direction in a state where it is sandwiched between the light peeling sheet 61 and the heavy peeling sheet 63. When a pressing force is added or heated, the part 62a of the adhesive composition which forms the baseless adhesive layer 62 may be pushed out from the width direction edge part of the baseless double-sided adhesive tape 60. In addition, in FIG. 10 (a), the state to which the pressing force was added is shown as one specific example. A part 62b of this sticky adhesive composition 62a is referred to as a cross section (hereinafter referred to as "width cross section") at the end portion in the width direction of the light peeling sheet 61 as shown in FIG. 10 (b). The wetted and widened portion 61a is formed to form an interface 64 between the widthwise end face 61a and the wetted adhesive composition 62b. Since the special peeling process is not normally performed to this width direction end surface 61a, the adhesive composition 62b which wetted and widened at this interface 64 is strongly adhere | attached on the hard peeling sheet 61. As shown in FIG. On the other hand, also in the heavy peeling sheet 63, the interface 65 of the adhesive composition 62c wetted and widened by the width direction end surface 63a is formed, As a result, in the width direction edge part of the base material double-sided adhesive tape 60, The adhesive force between the light peeling sheet 61 and the base material adhesive layer 62 becomes about the same as the adhesive force between the heavy peeling sheet 63 and the base material adhesive layer 62. At this time, when it is going to peel the light peeling sheet 61 from the base material double-sided adhesive tape 60, the adhesive composition 62b which got wet and widened by the width direction end surface 61a of this light peeling sheet 61 is easily peeled. Instead, as shown in FIG. 10, part 62d of the pressure-sensitive adhesive composition located at the widthwise end of the baseless pressure-sensitive adhesive layer 62 occurs together with the light peeling sheet 61. When the produced adhesive composition 62d coagulates and breaks inside or peels off at the interface between the adhesive composition 62 and the heavy peeling sheet 63, the adhesive composition 62d is formed on the light peeling sheet 61. This remains and becomes the residual adhesive 62e of the edge part. On the other hand, when the adhesive force of the adhesive composition 62b to the light peeling sheet 61 is large for the reason of the large area of the interface 64 with the adhesive composition 62b wetted and widened by the widthwise end surface 61a, etc. Attracted to the produced pressure-sensitive adhesive 62d, and the pressure-sensitive adhesive composition in the baseless pressure-sensitive adhesive layer 62, which is located at the center in the width direction more, also occurs on the light peeling sheet 61 side (upper side in FIG. 10), and the width thereof. Cohesive failure may occur inside the pressure-sensitive adhesive composition located in the direction center side. For this reason, when said adhesion | strength force is large, not only an edge but a single sticking to the center part of a width direction may generate | occur | produce.

(B) About the spot adhesion, the difference of the peeling force of a heavy peeling sheet (it is also called "heavy peeling force" in this specification.) With respect to the peeling force of a light peeling sheet (it is also called "light peeling force" in this specification.) By setting it as 10 mN / 50mm or more, generation | occurrence | production of the spot-shaped residual adhesive 52b can be suppressed stably, and when it is set to 20mN / 50mm or more, the generation can be suppressed more stably.

(C) It is not easy to suppress that part 62a of the adhesive composition which forms the baseless adhesive layer 62 from the width direction edge part of the baseless double-sided adhesive tape 60 is pushed out about an edge bonding. When it is going to form the adhesive roll which consists of a winding body of the base material double-sided adhesive tape 60, the release sheet which forms the outer side of a winding body based on the tension added to the elongate direction of a tape is the baseless adhesive layer 62 in its inside. Inevitably pressurize. Moreover, when the temperature in the storage and use environment of the baseless double-sided pressure-sensitive adhesive tape 60 becomes high, the fluidity of the baseless pressure-sensitive adhesive layer 62 becomes high. In this case, it is easy to generate | occur | produce the part 62a of the said adhesive composition more easily.

(D) In order to prevent the extruded adhesive composition 62a from causing end sticking, the extruded adhesive composition 62a may be prevented from being wetted and widened in the cross section in the width direction of the light peeling sheet 61.

(E) One of the simplest methods for that is the area | region in which the baseless adhesive layer 62 is not laminated | stacked in the width direction both ends of the peeling surface of the light peeling sheet 61 (henceforth "it is an" adhesive-free area "). ) Is installed.

This invention completed by the above knowledge, First, it is equipped with a light peeling sheet, a base material adhesive layer, and a heavy peeling sheet, the peeling surface of the said light peeling sheet contact | connects one main surface in the said base material adhesive layer, A long baseless double-sided adhesive tape in which the peeling surface of the heavy peeling sheet is in contact with the other main surface, wherein the peeling force (F _L ) of the light peeling sheet and the peeling force (F _H ) of the heavy peeling sheet are expressed by the following equation. (1) was satisfied, and the peeling surface of the said light peeling sheet provided the area | region (region without an adhesive) which the said base material adhesive layer is not laminated | stacked in the width direction both ends, The base material double sided adhesive tape characterized by the above-mentioned. (Invention 1).

F _H -F _L ≥10mN / 50mm (1)

In addition, said "peel force of a light peeling sheet" and "peel force of a heavy peeling sheet" are obtained by measuring using the laminated body for light peeling force measurement, and the laminated body for heavy peeling force measurement, respectively, as mentioned above. Can be.

In the said invention (invention 1), it is preferable that the said baseless adhesive layer is laminated | stacked on the whole area | region of the width direction of the peeling surface of the said heavy peeling sheet (invention 2).

This invention provides the adhesive roll which consists of a winding body which winds the baseless double-sided adhesive tape which concerns on any one of said invention (invention 1, 2) of this invention (invention 3). In the substrateless double-sided adhesive tape according to the present invention, even if the pressing force is added in the cross-sectional direction at the time of winding, and the pressure-sensitive adhesive composition is pushed out from the widthwise end portion, the possibility of end bonding in the adhesive roll is reduced.

Thirdly, the present invention is a method for producing a baseless double-sided pressure-sensitive adhesive tape according to the invention (Invention 1), wherein a width narrower than the width of the peeling surface is provided on the peeling surface in one of the light peeling sheet or the heavy peeling sheet. The light-peelable sheet or the heavy foil on the exposed main surface of the pressure-sensitive adhesive layer forming step of forming the plurality of long substrateless pressure-sensitive adhesive layers to be spaced apart from each other, and the plurality of long-length substrateless pressure-sensitive adhesive layers formed by the pressure-sensitive adhesive layer forming step. By affixing the peeling surface on the other side of the re-sheet, the light peeling sheet and the heavy peeling sheet in the first raw material forming step of forming the first raw material and the first raw material obtained by the first raw material forming step. And cut the portion not sandwiching the base material pressure-sensitive adhesive layer in the long direction, and at both ends in the width direction of the peeling surface of the light peeling sheet. Provided is a method for producing a baseless double-sided pressure-sensitive adhesive tape, comprising a cutting step of obtaining the baseless double-sided pressure-sensitive adhesive tape having a region where the baseless pressure-sensitive adhesive layer is not laminated (invention 4).

Fourthly, this invention is a manufacturing method of the base material double sided adhesive tape which concerns on said invention (invention 2), Comprising: A light peeling sheet, a base material adhesive layer, and a heavy peeling sheet are provided, A second raw material forming step of preparing a long second raw material in which the peeling surface of the light peeling sheet is in contact with a main surface, and the peeling surface of the heavy peeling sheet is in contact with the other main surface; the first material obtained by the second raw material forming step The first laminated sheet is juxtaposed in the width direction with respect to a portion where the first laminated sheet made of the laminate of the heavy release sheet and the baseless pressure-sensitive adhesive layer is laminated on the light release sheet in the vicinity of both ends in the width direction of the raw material. Half which carries out the half cut which makes the surface containing a long direction and a cross-sectional direction into a cut surface so that it may be divided | segmented into three laminated sheets to become from the said heavy peeling sheet side Of the three laminated sheets of the first laminated sheet separated by the step and the half cut step, two laminated sheets on the widthwise both ends side of the second raw material are peeled off from the second raw material, and the light peeling is performed. It provides the peeling removal process of obtaining the said baseless double-sided adhesive tape which has the area | region where the said baseless adhesive layer is not laminated in the width direction both ends of the peeling surface of a sheet, The manufacturing method of the baseless double-sided adhesive tape characterized by the above-mentioned. (Invention 5).

The fifth aspect of the present invention provides a method for producing a baseless double-sided pressure-sensitive adhesive tape according to the present invention (Invention 2), wherein the peeling force of the heavy peeling sheet, the baseless pressure-sensitive adhesive layer and the release surface of the baseless pressure-sensitive adhesive layer is The process release sheet lower than the peeling force with respect to the said base material-less adhesive layer of the peeling surface of a heavy peeling sheet is provided, The peeling surface of the said process release sheet contact | connects one main surface in the said base material adhesive layer, One main surface by peeling the said process release sheet from the 3rd raw material formation process which prepares the elongate 3rd raw material which the peeling surface of the said heavy peeling sheet contact | connects the main surface, and the said 3rd raw material obtained by the said 3rd raw material formation process. The peeling process of obtaining the laminated body which consists of this exposed base material adhesive layer and the said heavy peeling sheet, and the said laminated body obtained by this peeling process A light peeling sheet having a wider width than the base material pressure sensitive adhesive layer is bonded to the main surface of the baseless pressure sensitive adhesive layer side of the sheet so that the peeling surface is bonded to each other, and the base material pressure sensitive adhesive layer is formed at both ends in the width direction of the peeling surface of the light peeling sheet. Provided is a method for producing a baseless double-sided pressure-sensitive adhesive tape, comprising a sticking step of obtaining the baseless double-sided pressure-sensitive adhesive tape having a region not laminated.

Sixth, the present invention comprises a step of winding a baseless double-sided adhesive tape according to any one of the inventions (Invention 4 to 6) to obtain an adhesive roll made of a wound body. (Invention 7).

Since the difference with respect to the light peeling force of the heavy peeling force is 10 mN / 50mm or more, the base material double sided adhesive tape of this invention can suppress spot adhesion easily.

In addition, since an adhesive-free area | region is baked in the width direction both ends of the main surface of the side which opposes the base material adhesive layer in a light peeling sheet, even if an adhesive composition is pushed out in the width direction both ends of a base material adhesive layer, the adhesive composition is hard. It only wets and spreads on the peeling surface of a peeling sheet, and does not reach the cross section of the hard peeling sheet in the width direction. For this reason, the baseless double-sided adhesive tape of this invention can also stably suppress generation | occurrence | production of an end bonding.

BRIEF DESCRIPTION OF THE DRAWINGS The cross section conceptually showing the cross section in the width direction in the base material double sided adhesive tape which concerns on one Embodiment of this invention.
Fig. 2 is a partially enlarged view of a cross section in a width direction conceptually showing the action of the baseless double-sided adhesive tape according to one embodiment of the present invention.
3 is a flow diagram conceptually showing the first half of a first manufacturing method which is one of the methods of manufacturing a substrateless double-sided adhesive tape according to one embodiment of the present invention.
4 is a flow chart conceptually showing the second half of the first manufacturing method which is one of the methods of manufacturing the baseless double-sided adhesive tape according to one embodiment of the present invention.
Fig. 5 is a flow diagram conceptually showing the first half of a second manufacturing method which is one of the methods for manufacturing the baseless double-sided adhesive tape according to one embodiment of the present invention.
6 is a flow chart conceptually showing the second half of the second manufacturing method, which is one of the methods of manufacturing the substrateless double-sided adhesive tape according to one embodiment of the present invention.
7 is a flow chart conceptually showing one specific example of a third manufacturing method which is one of the methods of manufacturing the baseless double-sided adhesive tape according to one embodiment of the present invention.
FIG. 8 is a flow diagram conceptually showing another example of the third example of the method of manufacturing the baseless double-sided pressure-sensitive adhesive tape according to the embodiment of the present invention. FIG.
Fig. 9 is a sectional view (a) and a perspective view (b) conceptually showing a baseless double-sided pressure-sensitive adhesive tape in which spot adhesion is occurring;
10 is a view conceptually showing the occurrence of end bonding in the baseless double-sided adhesive tape, (a) a cross-sectional view conceptually showing a state in which the baseless double-sided adhesive tape is pressed, (b) of the baseless double-sided adhesive tape A partial perspective view conceptually showing a cross-sectional view conceptually illustrating a state where the pressure-sensitive adhesive composition is wet and widened on the side of the widthwise end, and (c) a substrateless double-sided pressure-sensitive adhesive tape in which end bonding occurs.

This invention is demonstrated in more detail using embodiment.

1. Double sided adhesive sheet

BRIEF DESCRIPTION OF THE DRAWINGS It is sectional drawing which conceptually showed the cut surface (it is called "a width direction cross section" in this invention) in the baseless double-sided adhesive tape which concerns on one Embodiment of this invention.

As shown in FIG. 1, in the baseless double-sided adhesive tape 10 according to the embodiment of the present invention, the light peeling sheet 1, the baseless adhesive layer 2, and the heavy peeling sheet 3 are in this order. It is laminated | stacked as it is. Here, the peeling surface of the light peeling sheet 1 is in contact with one main surface of the base material adhesive layer 2, and the peeling surface of the heavy peeling sheet 3 is in contact with the other main surface of the base material adhesive layer 2, have.

Hereinafter, each component is demonstrated.

(1) Base material adhesive layer

The baseless adhesive layer 2 with which the baseless double-sided adhesive tape 10 which concerns on this embodiment was equipped is a layered body which consists of an adhesive composition. The composition of the adhesive composition which comprises the base material adhesive layer 2 is not specifically limited. As an adhesive which is a main component, adhesives, such as rubber type, an acryl type, silicone type, and urethane type, are illustrated, these one type may be used, and two or more types may be used.

When explaining an acrylic adhesive in some detail above, an acrylic copolymer obtained by copolymerizing a functional group containing monomer and other monomers, such as an acrylic ester and a methacrylic ester, is taken as a main component. As needed, you may further contain a solvent, a crosslinking agent, a tackifier, a filler, a coloring agent, antioxidant, an antistatic agent, a ultraviolet absorber, etc.

As a functional group containing monomer, carboxyl group-containing monomers, such as acrylic acid and methacrylic acid, hydroxyl group containing monomers, such as 2-hydroxyethyl acrylate, 2-hydroxyethyl methacrylate, and 4-hydroxybutyl acrylate, are mentioned, for example. It is preferable that a functional group containing monomer contains 0.3-5.0 mass% as a monomer unit using the whole monomer which comprises an acryl-type copolymer as a reference | standard (100 mass%). By containing a functional group, an acryl-type copolymer can adjust cohesion force by reaction with a crosslinking agent, can suppress the sticking out of an adhesive composition, and can improve adhesive force and heat resistance.

There is no restriction | limiting in particular as a crosslinking agent used for an adhesive composition, It can select suitably from what is conventionally used by the adhesive composition which has an acrylic material as a main component, For example, a polyisocyanate compound, an epoxy resin, a melamine resin, a urea Resins, dialdehydes, methirol polymers, aziridine compounds, metal chelate compounds, metal alkoxides, metal salts and the like can be used, and preferably polyisocyanate compounds can be used.

A filler is contained from a viewpoint of adjustment of an optical characteristic, a mechanical characteristic, etc. In order to diffuse the light which permeate | transmits and to make the whole display panel uniform brightness, for example, the filler which consists of microparticles | fine-particles may be used. Specific examples of such fine particles include inorganic white pigments such as silica, calcium carbonate, aluminum hydroxide, magnesium hydroxide, clay, talc and titanium dioxide; And organic transparent or white pigments such as acrylic resins, polystyrene resins, polyethylene resins, epoxy resins, and silicone resins. Among these, silicone beads, epoxy resin beads, and polymethyl methacrylate beads are preferable from the viewpoint of obtaining excellent optical properties. Similarly, from the viewpoint of obtaining excellent optical characteristics, the fine particles preferably have a circular shape with uniform light diffusion and an average particle diameter of 1 to 10 m. In addition, this average particle diameter is a particle size based on the centrifugal sedimentation light transmission method, and CAPA-700 by Horiba Corporation is illustrated as a measuring apparatus for this.

The storage elastic modulus (G ') at 23 degrees C of the adhesive composition which concerns on the base material adhesive layer 2 is not specifically limited. Since the lower the modulus of elasticity of the baseless pressure-sensitive adhesive layer 2, the larger the amount pushed out to the cross section, the lower the modulus of elasticity, the more noticeable the effect of the present invention. In consideration of the sticking titration, the storage elastic modulus G 'is preferably about 0.001 to 1 MPa, and more preferably about 0.01 to 0.2 MPa. On the other hand, storage elastic modulus (G ') laminate | stacks the layer of 30 micrometers thick adhesive composition, produces the columnar test piece of thickness 8mm (phi) * 3mm, and measures it on the following conditions by the torsion shearing method.

Measuring device: Dynamic viscoelasticity measuring device Physica MCR 300 made by Anton Paar

Frequency: 1Hz

Temperature: 23 degrees Celsius

The cross-sectional direction length (henceforth only "thickness") of the base material adhesive layer 2 is not specifically limited. Since the thicker the baseless pressure-sensitive adhesive layer 2 is, the larger the amount of the baseless pressure-sensitive adhesive layer 2 is pushed out to the cross section, the thicker the thickness is, the effect of the present invention is remarkable. It should be set suitably according to a use, and it is about 5 micrometers or more and 250 micrometers or less normally.

(2) light peeling sheet

The light peeling sheet 1 with which the baseless double-sided adhesive tape 10 which concerns on this embodiment was equipped is the light peeling support body 1a used as the support body of the light peeling sheet 1, and the light peeling support body 1a. The light release agent layer 1b comprised on the main surface of the side which opposes the base material adhesive layer 2 is provided. The main surface on the side of the light release agent layer 1b in the light release sheet 1 forms a peeling surface.

In this embodiment, the width of the light peeling sheet 1 is wider than the width of the baseless pressure-sensitive adhesive layer 2, that is, the width thereof is wider, and at the same time, the light release layer 1b side of the light peeling sheet 1 is present. The main surface (hereinafter also referred to as "the light release layer side main surface") is provided with the regions 1d and 1e in which the baseless adhesive layer 2 is not affixed at the both ends of the width direction of 1c. In this embodiment, this area is also called "adhesive-free area".

The action of the adhesive-free regions 1d and 1e will be described with reference to FIG. 2.

Fig. 2 is a partially enlarged view of a cross section in the width direction conceptually showing the action of the baseless double-sided adhesive tape 10 according to the embodiment of the present invention.

As shown in FIG. 2, even when the adhesive composition is pushed out from the end surface 2A in the width direction of the baseless pressure-sensitive adhesive layer 2 based on the force applied in the cross-sectional direction of the baseless double-sided pressure-sensitive adhesive tape 10. When the light release agent layer side main surface 1c of the light release sheet 1 is provided with said adhesive-free area | region 1d, the loose adhesive composition 2B will have the light release agent layer side main surface in this adhesive-free area | region 1d. It only unfolds on (1c) and does not reach the cross section 1f of the width direction of the light peeling sheet 1. As shown in FIG. Therefore, by providing such a structure, generation | occurrence | production of the edge part adhesion which arises by sticking an adhesive composition to the width direction end surface 1f of the light peeling sheet 1 is suppressed.

Non-adhesive region width direction The width | variety of the non-adhesive region 1d, 1e in each edge part is the cross section 1f of the width direction of the light peeling sheet 1 beyond the non-adhesive region 1d, 1e. It is not specifically limited as long as it can implement | achieve what is not attached to). The amount of the pressure-sensitive adhesive composition 2B that has been applied is the pressing force and the ambient temperature applied to the baseless double-sided pressure-sensitive adhesive tape 10, the composition of the pressure-sensitive adhesive constituting the baseless pressure-sensitive adhesive layer 2 and its thickness, and further, the light peeling sheet 1. It fluctuates by the kind etc. of the peeling agent which comprises the said light release agent layer. According to this fluctuation, since the enlarged length of the width direction in the adhesive free area | region 1d, 1e of the swollen adhesive composition 2B also fluctuates, in consideration of said factor, the width | variety of adhesive-free area | region 1d, 1e is moderately adjusted. It is good to set. Generally, it is about 1-10 mm, and it is preferable to set it as 3-7 mm.

As long as the light peeling sheet 1 is equipped with said adhesive-free area | region 1d, 1e suitably, another structure is not specifically limited.

The material of the light peeling support body 1a which is a support body of the light peeling sheet 1 is not specifically limited. It may be composed of a resin material or a paper material. The resin species in the case of being composed of a resin material is arbitrary, and for example, polyesters such as polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, polyethylene, polypropylene, polyethylene vinyl chloride, polyethylene vinylidene chloride and poly Vinyl alcohol, ethylene-vinyl acetate copolymer, polystyrene, polycarbonate, polymethylpentene, polysulfone, polyether ether ketone, polyether sulfone, polyphenylene sulfide, polyetherimide, polyimide, fluororesin, polyamide, acrylic Resin, norbornene-based resin, cycloolefin resin and the like. The resin-based material related to the light peeling support 1a may be constituted by one of these, or may be constituted by a plurality of kinds.

Specific examples of the case where the light peeling support 1a is made of a paper-based material include paper substrates such as glassine paper, coated paper, and high-quality paper, and laminated papers laminated with thermoplastic resin such as polyethylene on the paper substrate. have.

From the viewpoint of adjusting the optical properties (visibility) and mechanical properties, the light peeling support 1a may contain a granular or short-fiber filler, or may contain a pigment or a dye.

The thickness of the light peeling support body 1a is not specifically limited, either. In the case of being excessively thin, the peeling workability is inferior, and in the case of being excessively thick, it may be disadvantageous from the viewpoint of economical efficiency. Usually, the thickness is about 20-250 micrometers.

The release agent composition (henceforth a "light release agent composition") which forms the light release agent layer 1b formed on one main surface of the light release support body 1a is light-peelable with respect to the base material adhesive layer 2 If it can represent, the composition is not specifically limited. Although resin materials, such as a silicone type, a fluorine type, and a long chain alkyl type, can be used as a main component, among these, the silicone type resin material which is inexpensive and can acquire stable performance is preferable. As a specific example, the crosslinking agent and the catalyst were added to the organopolysiloxane which has a C2-C10 alkenyl group in the terminal and / or side chain of a molecule | numerator, and does not have an aryl group. Although vinyl group, hexenyl group, octenyl group etc. are mentioned as a C2-C10 alkenyl group in this organopolysiloxane (silicone resin), A vinyl group and a hexenyl group are especially preferable. As said crosslinking agent, the crosslinking agent of organopolysiloxane which has a hydrogen atom (hydrosilyl group) couple | bonded with at least 2 silicon atoms in 1 molecule is used, for example. Specifically, dimethyl hydrodiene siloxy group terminal block dimethylsiloxane-methylhydrodiene siloxane copolymer, trimethyl siloxy group terminal block dimethylsiloxane-methyl hydrodiene siloxane copolymer, trimethyl siloxy group terminal block methyl methyl diene polysiloxane, and polyhydrodiene silcene Succioxane etc. are mentioned. It is preferable to set it as 0.1-100 mass parts with respect to 100 mass parts of silicone resin, and, as for content of a crosslinking agent, it is more preferable to set it as 0.3-50 mass parts. The number of hydrogen atoms bonded to the silicon atoms contained in the crosslinking agent is preferably 1.0 to 5.0 (molar ratio), more preferably 1.2 to 3.0 (molar ratio) with respect to the number of alkenyl groups in the silicone resin. . As said catalyst, a platinum type compound is used, for example. Examples of the platinum compound include particulate platinum, particulate platinum adsorbed on a carbon powder carrier, chloroplatinic acid, alcohol-modified chloroplatinic acid, olefin complexes of chloroplatinic acid, palladium, rhodium catalysts, and the like. A platinum group metal catalyst is normally added about 1-1000 mass ppm as a platinum-type metal with respect to the total amount of a silicone resin and a crosslinking agent.

The peeling force with respect to the base material adhesive layer 2 of the light release agent layer 1b, ie, the light peeling force, has a peeling force with respect to the base material adhesive layer 2 of the heavy release agent layer 3b, as mentioned later. In other words, it should be defined in relation to the heavy peeling force, and is not particularly limited as the peeling force alone, but is preferably 0 mN / 50 mm or more and 100 mN / 50 mm or less from the viewpoint of stable light peelability, and is 5 mN / 50 mm or more. It is more preferable that it is 50 mN / 50 mm or less.

On the other hand, the means for adjusting the peeling force of the light peeling sheet 1 is not specifically limited, For example, the method of controlling the following factors is mentioned.

Types of resin materials (silicone, fluorine, long-chain alkyl, etc.) as the main component of the light release agent composition

Molecular weight of the resin material as the main component of the light release agent composition

Crosslinking density of the light release agent composition (The crosslinking density is also affected by the kind of the crosslinking agent, the content before the crosslinking reaction proceeds, the density of the functional groups reacting with the crosslinking agent, etc.).

Additional components contained in the light release agent composition (specifically, low molecular weights which do not crosslink and / or are difficult to crosslink) are exemplified.

Thickness of the light release agent layer 1b

Surface roughness of the bonding surface of the light release agent layer 1b with the base material adhesive layer 2

Thickness of the light peeling support body 1a

Flexibility of the light peeling support 1a (easy to bend)

Type of adhesive constituting the baseless adhesive layer 2

In addition, the peeling force in the heavy peeling sheet 3 mentioned later can also be adjusted by controlling the same factors as the factor regarding the peeling force of the said light peeling sheet 1.

A primer layer may be laminated between the light peeling support 1a and the light release agent layer 1b. The primer layer is composed of, for example, a mixture of an organoaluminum compound and an organosilicon compound. As the organoaluminum compound, for example, aluminum tris (acetylacetonate), and as the organosilicon compound, for example, gamma -methacryloxypropyltrimethoxysilane is used. By providing such a primer layer, even if the adhesiveness of the light peeling support body 1a and the light release agent layer 1b is bad, adhesiveness between them can be improved.

In addition, a primer layer may be comprised by the metal alkoxide and / or metal alkoxide partial hydrolyzate condensation polymer, for example. Since such a primer layer has an antistatic effect, when the baseless double-sided pressure-sensitive adhesive tape 10 is formed of a wound body on a roll, generation of static electricity can be prevented when the baseless double-sided pressure-sensitive adhesive tape 10 is released from the wound body. Can be.

On the other hand, although the light peeling sheet 1 which concerns on this embodiment is a structure which consists of a light peeling support body 1a and a light peeling agent layer 1b, the elongate sheet-like member whose at least one main surface is a peeling surface which has hard peeling property. As long as it is, the light peeling sheet 1 may have another structure. For example, the light peeling support body 1a itself has light peeling property, and the light peeling sheet 1 may be comprised only by the light peeling support body 1a.

(3) heavy peeling sheet

The heavy peeling sheet 3 which the baseless double-sided adhesive tape 10 which concerns on this embodiment is equipped with the heavy peeling support 3a used as the support body of the heavy peeling sheet 3, and the heavy peeling support 3a. The heavy release agent layer 3b comprised on the main surface of the side which opposes the base material adhesive layer 2 is provided. The main surface on the side of the heavy release agent layer 3b in the heavy release sheet 3 forms a peeling surface.

The relationship between the width of the heavy peeling sheet 3 and the width of the baseless adhesive layer 2 is that the heavy peeling sheet 3 completely covers the baseless adhesive layer 2 in the width direction, that is, the heavy peeling The width | variety of the sheet | seat 3 is good as long as it satisfy | fills the relationship which becomes the width | variety of the baseless adhesive layer 2, and it is not necessary in particular to provide the area | region with no adhesive in the width direction both ends like the light peeling sheet 1. It is preferable that especially the relationship which becomes the width | variety of the width | variety = baseless adhesive layer 2 of the heavy peeling sheet 3 is preferable. If it is such a structure, it becomes possible to obtain a double-sided adhesive sheet by the 2nd manufacturing method or 3rd manufacturing method of a double-sided adhesive sheet mentioned later.

The material of the heavy peeling support 3a which is a support of the heavy peeling sheet 3 is not specifically limited. Since the detail is the same as that of the light peeling support body 1a, description is abbreviate | omitted.

The thickness of the heavy peeling support 3a is not specifically limited, either. It should be set suitably similarly to the case of the light peeling support body 1a, and the thickness is about 20-250 micrometers normally.

The release agent composition to form a jungbak eluent layer (3b) formed on the main surface of one of jungbak Li support (3a) (hereinafter referred to as "jungbak eluent composition") is jungbak riryeok (F _H) (jungbak richeung (3b) The peeling force with respect to the base material-less adhesive layer 2) and the light peeling force (F _L ) (the peeling force with respect to the base material adhesive layer 2 of the light-releasing agent layer 1b) show the relationship of following formula (1) As long as it has what it has, it is arbitrary.

F _H -F _L ≥10mN / 50mm (1)

When the heavy peeling force F _H and the hard peeling force F _L satisfy | fill the relationship of said Formula (1), generation | occurrence | production of a spot adhesion is stably suppressed. From the viewpoint of suppressing the occurrence of spot adhesion more stably, the right side of the formula (1) is preferably 20 mN / 50 mm, particularly preferably 30 mN / 50 mm.

The heavy peeling force (F _H ) is not particularly limited, but is preferably 10 mN / 50 mm or more and 300 mN / 50 mm or less, more preferably 20 mN / 50 mm or more and 200 mN / 50 mm or less, from the viewpoint of stably showing the middle peelability. It is more preferable that they are / 50 mm or more and 150 mN / 50 mm or less.

In addition, a primer layer may be laminated | stacked between the heavy release support body 3a and the heavy release agent layer 3b. Since the detail is the same as that of the primer layer between the light peeling support body 1a and the light release agent layer 1b, description is abbreviate | omitted.

On the other hand, the heavy peeling sheet 3 which concerns on this embodiment is a structure which consists of the heavy peeling support body 3a and the heavy peeling agent layer 3b, but the elongate sheet-like member whose at least one main surface is a peeling surface which has heavy peeling property. As long as it is, the heavy peeling sheet 3 may have another structure. For example, the heavy peeling support 3a itself may have heavy peeling property, and the heavy peeling sheet 3 may be comprised only by the heavy peeling support 3a.

2. Manufacturing method of double-sided adhesive sheet

Although the manufacturing method is not specifically limited as long as the base material double sided adhesive tape 10 which concerns on this embodiment has the said characteristic, but it manufactures by the following manufacturing method, it is possible to stably and efficiently base material double sided adhesive tape 10 ) Is realized.

(1) first manufacturing method

The 1st manufacturing method which concerns on this embodiment is equipped with the adhesive layer formation process, the 1st raw material formation process, and the cutting process demonstrated next.

Hereinafter, each process is explained in full detail, referring FIG. 3 and FIG. 3 and 4 are flowcharts conceptually showing a first manufacturing method which is one of the methods of manufacturing the baseless double-sided adhesive tape 10 according to one embodiment of the present invention.

(A) adhesive layer formation process

In the pressure-sensitive adhesive layer forming step, the long light release sheet 1 (consists of the light release support body 1a and the light release layer 1b) or the long heavy release sheet 3 (the layered release support body 3a) It has a width narrower than the width of this main surface on the main surface of the side in which the release agent layer in one side of (), in other words, the light release agent layer 1b or the heavy release agent layer 3b was formed. A plurality of elongate substrateless pressure-sensitive adhesive layers are formed to be spaced apart from each other.

In FIG. 3 (a), as one specific example, three long baseless adhesive layers 2 2 'and 2 are formed on the main surface 1c on the light release agent layer 1b side of the long light release sheet 1. ') Is formed to be spaced apart from each other. In other words, the baseless pressure-sensitive adhesive layers 2, 2 ', 2' are formed in a stripe shape on the main surface 1c of the long, light-peelable sheet 1.

At this time, the edge part of the width direction edge part side of the light peeling sheet 1 in the end side base material pressure sensitive adhesive layer 2, 2 'which is a base material pressure sensitive adhesive layer near the width direction edge part of the light peeling sheet 1, Between the width direction edge parts of the light peeling sheet 1, the adhesive-free area | regions 1d and 1e are provided. Moreover, the edge part of both width direction end sides in the inner side baseless adhesive layer 2 'which is a baseless adhesive layer located in a center part among three baseless adhesive layers, and the end side baseless adhesive layer (2,2) The adhesive-free area | region 1g, 1h is provided also between the edge part of the opposite side to the width direction edge end side of the light peeling sheet 1 of "').

Thus, the specific method for forming the baseless adhesive layer of several lines in stripe form on the main surface 1c of the elongate hard peeling sheet 1 is not limited. The discharge shape in the apparatus which discharges the adhesive composition which comprises a base material adhesive layer onto the main surface 1c of the elongate hard peeling sheet 1 may be broken, and the discharge apparatus of the said adhesive composition is on demand. It may be comprised with a type inkjet head.

(B) first raw material forming step

By carrying out the above-mentioned pressure-sensitive adhesive layer forming step, one of the main surfaces 2a, 2a ', 2a' in the plurality of long baseless pressure-sensitive adhesive layers 2, 2 ', 2 "has a long light peeling sheet 1 ), And the other main surface 2b, 2b ', 2b "is in the exposed state. The main surface 2b, 2b', 2b" of the exposed side is attached to the heavy peeling support 3a and the middle foil. It attaches to the main surface 3c of the side in which the heavy release agent layer 3b in the heavy release sheet 3 which consists of the riser layer 3b was formed (FIG. 3 (b)). As a result, the 1st which is sandwiched between the elongate hard peeling sheet 1 and the heavy peeling sheet 3 in the state which the base-less adhesive layer 2, 2 ', 2 "of three lines separated from each other. The raw material 20 is formed (FIG. 3 (c)).

(C) cutting process

In the first raw material 20 obtained by the above-described first raw material forming step, the light-peelable sheet 1 and the heavy peeling sheet 3 are used to form a baseless pressure-sensitive adhesive layer 2, 2 ', 2 ". The part which does not pinch | in other words, the part corresponding to the adhesive-free area | region 1g, 1h of the light peeling sheet 1 is cut | disconnected in the elongate direction (FIG. 4 (d)). The cut pieces 21, 21 ', 21 "consist of the elongate light peeling sheet 1 and the elongate base material adhesive layer 2, 2', 2" pinched by the elongate heavy peeling sheet 3. The main surface on the baseless pressure-sensitive adhesive layer 2 side of the light peeling sheet 1 is provided with the non-adhesive regions 1d, 1g ', 1g ", 1h', 1h", and 1e at both ends in the width direction. And base-less double-sided adhesive tapes 21, 21 ', and 21 "(Fig. 4 (e)).

According to the first manufacturing method described above, even if the width of the raw material is substantially set to a certain length (for example, 1 m) for reasons of manufacturing facilities, the first raw material 20 As long as it is narrower than a width, the baseless double-sided adhesive tape 10 of arbitrary width (for example, 20 cm, 30 cm, etc.) can be obtained.

(2) second manufacturing method

The 2nd manufacturing method which concerns on this embodiment is equipped with the 2nd raw material formation process, half cut process, and peeling removal process demonstrated next.

Hereinafter, each process is explained in full detail, referring FIG. 5 and FIG. 5 and 6 are flowcharts conceptually showing a second manufacturing method which is one of the methods of manufacturing the baseless double-sided adhesive tape 10 according to the embodiment of the present invention.

(A) 2nd raw material formation process

In the second raw material forming step, the long light peeling sheet 1 (consists of the light peeling support 1a and the light release agent layer 1b) and the long heavy peeling sheet 3 (heavy peeling support 3a). And a second base material 30 composed of a long baseless pressure-sensitive adhesive layer 2 sandwiched by the heavy release agent layer 3b.

Here, the two main surfaces of the baseless pressure-sensitive adhesive layer 2 are the main surface on the light release layer 1b side of the light release sheet 1 and the heavy release layer 3b on the heavy release sheet 3, respectively. It is in contact with the main surface of the side (FIG. 5 (a)). The manufacturing method of this 2nd raw material 30 is arbitrary. The adhesive composition which gives a baseless adhesive layer 2 is apply | coated on the principal surface by the side of the heavy release agent layer 3b in the heavy release sheet 3, and is opposed to the heavy release sheet 3 in the obtained application layer. The exposed surface on the side opposite to the side may be obtained by affixing on the main surface of the light release agent layer 1b side in the light release sheet 1, or on the main surface of the light release agent layer 1b side in the light release sheet 1. The adhesive agent which provides the base material adhesive layer 2 to this is apply | coated, and the exposed surface of the opposite side to the side which opposes the light peeling sheet 1 in the obtained application layer is a heavy release agent in the heavy peeling sheet 3 You may affix it on the main surface of the layer 3b side, and to obtain it.

In addition, the coating method of the adhesive composition which gives the base material adhesive layer 2 is arbitrary. As the specific example, the gravure coat method, the bar coat method, the spray coat method, the spin coat method, the knife coat method, the roll coat method, the die coat method, etc. are mentioned.

In addition, the width direction both ends of the 2nd raw material 30 are cut | disconnected to the surface containing the long direction and the cross-sectional direction normally, and are made into the smooth end surface 30a, 30b. The end faces 30a and 30b need not be smooth surfaces, but are preferably smooth surfaces in consideration of workability. In addition, from the viewpoint of improving workability, the length of the second raw material 30 may also be cut to an appropriate length (a few volumes).

(B) half cut process

In the half cut step, the heavy peeling sheet 3 and the base material pressure-sensitive adhesive layer 2 are laminated in the vicinity of the end portions 30c and 30d in the width direction of the second raw material 30 obtained by the second raw material forming step. Three laminated sheets 31a, 3lb, in which the first laminated sheet 31 is juxtaposed in the width direction with respect to the portions 30e and 30f in which the first laminated sheet 31 made of a sieve is laminated on the light release sheet 1. The half cut which makes the surface containing a long direction and a cross-sectional direction into a cut surface so that it may isolate | separate into 31c) is performed from the heavy peeling sheet 3 side (FIG. 5 (b), (c)). Here, the "half cut" is not a full cut for cutting the entire second raw material 30 (that is, cutting until detachable), but the first laminated sheet 31 is cut, but the light peeling sheet 1 Means it is not completely cut.

As described above, in the second manufacturing method, the final width of the baseless pressure-sensitive adhesive layer is determined in the half cut step. On the other hand, the 1st manufacturing method includes the process of forming so that a plurality of elongate base material adhesive layers may be mutually spaced on the main surface of an elongate hard peeling sheet. Therefore, in the first manufacturing method, it is necessary to determine the final width of the baseless pressure-sensitive adhesive layer at the stage of the raw material forming step. In a 2nd manufacturing method, in a raw material formation process, the wide raw material is obtained, without determining the final width of a base material adhesive layer, and a half cut process can be performed after that to become the width | variety of a desired base material adhesive layer. In other words, the crystal | crystallization of the final extension of a base material adhesive layer can be reserved from the raw material formation process to the half cut process. Therefore, the second manufacturing method is excellent from the viewpoint of distribution management.

As will be described later, the portion 30e (30f) into which the knife for half cut in the widthwise end surface 30a (30b) and the vicinity of the widthwise both ends 30c (30d) in the second raw material 30 enters. The distance with is corresponded to the width direction length of the adhesive free area | region in the base material double sided tape obtained by a 2nd manufacturing method.

(C) Peeling and removing process

In the peeling removal process, of the three laminated sheets 31a, 3lb, and 31c in which the first laminated sheet 31 is separated by the implementation of the half cut process, two sheets on both sides in the width direction of the second raw material 30 are formed. The laminated sheets 31a and 31c are peeled off from the second raw material 30 (Fig. 6 (a)). As a result, only the laminated sheet 3lb located at the center portion remains on the light peeling sheet 1. On the other hand, in the above half cut process, by trimming both ends of the second raw material 30 immediately before the half cut, the two laminated sheets 31a and 31c positioned at both ends of the second raw material 30 in the peeling removing process are removed. When peeling and removing, the possibility of an end bonding occurring can be reduced.

Thus, the laminated body which consists of the laminated sheet 3lb and the light peeling sheet 1 is, in other words, base-material double-sided adhesive provided with the adhesive free area | region 1d, 1e in the width direction both ends of the light peeling sheet 1 It becomes the tape 10 (FIG. 6 (b)).

(3) third manufacturing method

In the third manufacturing method according to the present embodiment, the width of the baseless adhesive layer 2 and the width of the heavy peeling sheet 3 are different from each other by the method different from the second manufacturing method (that is, not including the half cut step). As a method of manufacturing the equivalent base material double-sided tape, it is equipped with the 3rd raw material formation process, trimming process, peeling process, and sticking process which are demonstrated next, for example.

Hereinafter, each process is explained in full detail, referring FIG. 7 and FIG. 7 and 8 are flowcharts conceptually showing two specific examples of the third manufacturing method, which is one of the methods of manufacturing the baseless double-sided adhesive tape 10 according to the embodiment of the present invention.

(A) Third raw material forming step

In the third raw material forming step, first, the peeling force of the elongated release sheet is lower than the peeling force of the baseless pressure sensitive adhesive layer 2 in the heavy release sheet 3. The release sheet 4 is prepared. The 3rd raw material 40 which is a laminated body in which the peeling sheet 4 for processes, the elongate base material adhesive layer 2, and the elongate heavy peeling sheet 3 is arrange | positioned in this order is obtained (FIG. 7 (a)). ). The specific method for obtaining this 3rd raw material 40 is arbitrary. You may apply | coat the adhesive composition which gives a base material adhesive layer 2 on the process release sheet 4, and further laminate | stack the heavy peeling sheet 3, and heavy press the adhesive composition which gives a base material adhesive layer 2 to it. You may apply | coat on the re seat 3, and further laminate | stack the process peeling sheet 4.

(B) peeling process

In the peeling process, the process release sheet 4 is peeled from the 3rd raw material 40 obtained by said 3rd raw material formation process, and the baseless adhesive layer 2 and the heavy foil which one main surface 2b exposed were exposed. The laminated body 41 which consists of the re-sheets 3 is obtained (FIG. 7 (b)). In the case where the third raw material 40 is in the form of a roll, there is a possibility that end bonding occurs in the step of obtaining the laminate 41 from the third raw material 40, but before the peeling sheet 4 for process is peeled off, the third By trimming both ends of the raw material 40, it is possible to reduce the possibility that such end bonding occurs.

(C) sticking process

In the sticking step, light peeling wider than the base material pressure-sensitive adhesive layer 2 of the laminate 41 on the main surface of the base body pressure-sensitive adhesive layer 2 side in the laminate 41 obtained by the above peeling step. The sheet | seat 1 is stuck and the base material double-sided adhesive tape 10 provided with the adhesive free area | region 1d, 1e in the width direction both ends of the light peeling sheet 1 is obtained (FIG. 7 (c)).

The position of affixing of the light peeling sheet 1 to the base material adhesive layer 2 of the laminated body 41, the width | variety of the width of the base material adhesive layer 2 of the laminated body 41, and the width of the light peeling sheet 1 The relationship is not particularly limited. What is necessary is just to set suitably, considering that the length of the width direction of the adhesive-free area | region 1d, 1e is determined by the relationship of this sticking position and width.

(D) trimming process

On the other hand, when the next trimming process is arrange | positioned between a peeling process and a sticking process, the peeling sheet 4 and the light peeling sheet 1 for processes used for the 3rd raw material 40 can be made common.

In the trimming process, the light peeling sheet 1 is used as the 3rd raw material 40 obtained by the said 3rd raw material formation process (as shown to FIG. 8 (a), and the peeling sheet 4 for processes. ), The light peeling sheet 1 is peeled off, and the laminated body 41 which consists of the base material adhesive layer 2 and the heavy peeling sheet 3 which one main surface 2b exposed is obtained. The portions 41a and 4lb in the vicinity of the end portions in the width direction of the laminate 41 are cut in the long direction (Fig. 8 (b)) to shorten the width of the laminate 41 (Fig. 8 (c)). ). Subsequently, as a sticking process, the light peeling sheet 1 (processing release sheet 4) which is not trimmed in the width direction as what peeled at the said process is carried out by said trimmed baseless adhesive layer 2 The base-less double-sided adhesive tape which has adhesive-free area | region 1d, 1e in the width direction both ends of the light peeling sheet 1, when affixing again on the exposed main surface 2b of the side of the peeling sheet 1 ( 10) can be obtained (Fig. 8 (d)).

3. adhesive roll

The baseless double-sided pressure-sensitive adhesive tape 10 according to the present embodiment may be in a state in which the long direction is extended, but may be in a state of a wound body wound on a roll. This winding body, that is, an adhesive roll has the advantage that it is easy to store. On the other hand, based on the tension | tensile_strength tension provided when winding on a roll, the base material adhesive layer 2 in the base material double-sided adhesive tape 10 in an adhesive roll is a light peeling sheet 1 and heavy peeling. Pressurized by the sheet 3. For this reason, the adhesive composition which comprises the base material adhesive layer 2 will flow, and it will be easy to be pushed out from the width direction edge part of the base material double-sided adhesive tape 10. FIG. Even in such a case, the endless bonding does not occur in the baseless double-sided adhesive tape 10 according to the present embodiment.

4. Uses

Although the use of the base material double-sided adhesive tape 10 which concerns on this embodiment is not specifically limited, Since the partial defect of the base material adhesive layer 2 based on single bonding, and the local abnormal part of thickness do not generate | occur | produce, It can be used suitably. When an example is given, the adhesive layer for affixing a polarizer etc. to another light transmissive base material, the adhesive layer for air gaps in which a thick adhesive is used, and the adhesive layer for component pasting in an electronic component are mentioned.

The embodiments described above are described to facilitate understanding of the present invention and are not described to limit the present invention. Therefore, each element disclosed in the said embodiment is intended to include all the design changes and equivalents which belong to the technical scope of this invention. For example, in the above description, the light peeling sheet 1 and the heavy peeling sheet 3 are all composed of the supports 1a and 3a and the release agent layers 1b and 3b, and the light peeling sheet 1 And although the peeling surface of the heavy peeling sheet 3 is comprised by the surface of the peeling agent layers 1b and 3b, the peeling surface of the light peeling sheet 1 and the heavy peeling sheet 3 is a thing of the support body 1a, 3a. It may be comprised by the surface. Also in this case, due to a difference in molecular orientation, surface roughness, or the like, the cross section orthogonal to the peeling surfaces in the supports 1a and 3a becomes a surface strongly adhered to the baseless adhesive layer 2 unlike the peeling surface. There is a case.

EXAMPLE

Hereinafter, although an Example etc. demonstrate this invention further more concretely, the scope of the present invention is not limited to these Examples.

EXAMPLE 1

(1) Preparation of Coating Liquid

A pressure sensitive adhesive main agent (butyl acrylate, isobutyl acrylate, and acrylic acid) used as a main component of a (meth) acrylic acid ester polymer, a copolymer copolymerized in this order in a mass ratio of 49.125: 49.125: 1.75, solid content of 32 mass %) 100 mass parts, 1 mass part of isocyanate type crosslinking agents (trimetholol propane adductluene diisocyanate, 37.5 mass% of solid content), and 30 mass parts of methyl ethyl ketones as a solvent were mixed, and the coating liquid of the adhesive composition was manufactured. .

(2) production of raw materials

A release sheet (SP-PET382150, manufactured by Lintec Co., Ltd., 1000 mm long) having a 0.1 μm-thick silicon-based release agent layer formed on one main surface of a polyethylene terephthalate base material film having a thickness of 38 μm was prepared as a heavy peeling sheet. Moreover, the peeling sheet (SP-PET382120 by Lintec company, 1000 mm in length 1000) by which the silicone type release agent layer of thickness 0.1 micrometer is formed on one main surface of the polyethylene terephthalate base material film of 38 micrometers in thickness was prepared as a light peeling sheet.

The coating liquid of the said adhesive composition was apply | coated so that an adhesive width might be 980 mm with a roll knife coater on the main surface by the side of the peeling agent layer in the said heavy peeling sheet, it dried at 90 degreeC for 1 minute, and the 25-micrometer-thick base material adhesive layer was Got it. The main surface of the release agent layer side in the said light peeling sheet is bonded together to the main surface of the laminated body which consists of this base material adhesive layer and a heavy peeling sheet, and a heavy peeling sheet, a base material adhesive layer, and a light peeling sheet are this The laminated body arrange | positioned in order was obtained.

The width direction both ends of this laminated body were trimmed, the width was set to 860 mm, and further, the laminated body after this trimming was cut so that it might be divided into four in the long direction, and four 2nd raw materials of width 215 mm were produced. By this trimming, the cross section of the width direction of a 2nd raw material became what is comprised by the cross section of a heavy peeling sheet, the cross section of a base material adhesive layer, and the cross section of a hard peeling sheet on both surfaces.

(3) post-processing

Thus, each of the four second raw materials obtained is half cut in the long direction using a stamping from the main surface on the heavy peeling sheet side, and the second raw materials are all formed on the hard peeling sheet, A 205 mm wide laminate (hereinafter referred to as a "center side laminate") composed of a release sheet and a baseless adhesive layer, and a release sheet and a baseless adhesive layer located on each outer side in the width direction of the second raw material of the laminate. It was separated into two laminates (hereinafter, referred to as "end-side laminate") and a light peeling sheet.

Two end-side laminated bodies separated by half cut were peeled off from the second raw material, and the center-side laminated body (205 mm wide) obtained as the remainder was formed of a laminated body with a release sheet (without adhesive-free area) 5 mm) in both widths were wound up, and the adhesive roll was obtained. On the other hand, the tension during winding was 10 N and the length in the long direction was 300 m (the same applies hereinafter).

EXAMPLE 2

In the same manner as in Example 1, the coating solution, the heavy peeling sheet, and the light peeling sheet were prepared.

On the main surface of the said peeling agent layer side in the said heavy peeling sheet, the coating liquid of the said adhesive composition was apply | coated in the long direction so that four coating liquid layers of 205 mm of adhesive width and each space | interval were set to 10 mm with a roll knife coater. This coating liquid layer was dried at 90 degreeC for 1 minute, and four base material adhesive layers of 25 micrometers in thickness were obtained.

The main surface of the release agent layer side in the above-mentioned light peeling sheet is bonded together to the main surface of the base material adhesive layer side in the laminated body in which these four base material adhesive layers are mutually spaced and formed on the heavy peeling sheet, The raw material in which the base-less adhesive layer and the light peeling sheet are laminated in this order was obtained as the first raw material.

The first part of the first raw material of the heavy release sheet, on which the main surface on the release agent layer side and the main surface on the release agent layer side in the light release sheet are exposed (in other words, the baseless pressure sensitive adhesive layer is not affixed), is used as a cut portion. The raw material is cut in the long direction, and a 215 mm heavy peeling sheet, a 205 mm wide baseless adhesive layer, and a 215 mm light peeling sheet are laminated in this order, and the area of no adhesive near the width direction both ends of the light peeling sheet is laminated. Four baseless double-sided tapes having (all 5 mm in the width direction) were obtained. Each of the obtained baseless double-sided tape was wound up, and four adhesive rolls were obtained.

EXAMPLE 3

Using the 2nd raw material (width 215mm) obtained by the method of Example 1 as a 3rd raw material, the light peeling sheet in this 3rd raw material is peeled off, and consists of a baseless adhesive layer and a heavy peeling sheet which one main surface is exposed. A laminate was obtained. The width direction both ends of this laminated body were trimmed, and the length was set to the laminated body of 205 mm. The main surface on the release agent layer side of the above-mentioned light peeling sheet which peeled from the 3rd raw material was affixed to this main body of one side of the exposed baseless adhesive layer in the laminated body of 205 mm in width, and extended to both ends to this laminated body after trimming, respectively. A baseless double sided tape having a 5 mm non-adhesive area was obtained. The obtained baseless double-sided tape was wound up to obtain an adhesive roll.

[Comparative Example 1]

The 2nd raw material created in Example 1 was made into the baseless double-sided tape in that state, it was wound up, and the roll was obtained.

[Comparative Example 2]

In the post-processing with respect to the 2nd raw material created in Example 1, half cut was performed from the light peeling sheet side. In this half cut, the light peeling sheet and the base material adhesive layer were cut | disconnected.

From the half-cut raw material, the light peeling sheet of the separated width direction both ends was peeled off, and one main surface of the base material adhesive layer was exposed to the width direction both ends of the half cut raw material. Each of a part of one main surface of this exposed base material adhesive layer was affixed the polyethylene terephthalate (PET) film of 25 micrometers in thickness. This PET film was removed from the half cut raw material. By this peeling, the base material adhesive layer in the width direction both ends cut | disconnected by the half cut shifted to the PET film side. In this way, as a remainder of the half-cut raw material, a baseless double-sided tape having an adhesive-free region (all 5 mm in width) was provided in the vicinity of both end portions in the width direction of the heavy peeling sheet. This base material double-sided tape was wound up to obtain an adhesive roll.

(Comparative Example 3)

Except having used the heavy peeling sheet instead of the light peeling sheet, the raw material was obtained by the method similar to Example 1, and it was made into the baseless double-sided tape in that state. This baseless double-sided tape was obtained by laminating a heavy release sheet, a baseless pressure-sensitive adhesive layer, and a heavy release sheet in this order. This base material double-sided tape was wound up to obtain an adhesive roll.

[Test Example 1]

(1) Measurement of light peel force

By the manufacturing method similar to Example 1, the laminated body for measuring the light peel force of width 50mm was produced. In other words, a release sheet (SP-PET382150 manufactured by Lintec Co., Ltd.) in which a silicon-based release agent layer having a thickness of 0.1 μm was formed on one main surface of a polyethylene terephthalate base material film having a thickness of 38 μm was prepared as a heavy peeling sheet. Moreover, the peeling sheet (SP-PET382120 by Lintec company) in which the silicone type release agent layer of 0.1 micrometer in thickness is formed on one main surface of the polyethylene terephthalate base material film of 38 micrometers in thickness was prepared as a light peeling sheet. The coating liquid prepared in Example 1 was apply | coated with the roll knife coater on the main surface by the side of the peeling agent layer in the said heavy peeling sheet, it dried at 90 degreeC for 1 minute, and the 25-micrometer-thick base material adhesive layer was obtained. The main surface of the release agent layer side in the above-mentioned light peeling sheet is bonded together to the main surface of the laminated body which consists of this base material adhesive layer and a heavy peeling sheet, and a heavy peeling sheet, a base material adhesive layer, and a light peeling sheet are The laminated body arrange | positioned in this order was obtained. By cutting this laminated body, the laminated body for measuring the light peeling force of width 50mm was obtained.

The peeling force (light peeling force) of the light peeling sheet was measured using this laminated body for light peeling force measurement. In other words, in accordance with JIS Z0237, under a condition of 23 ° C. and a relative humidity of 50%, a 180 ° pulling-out method of bending a light peeling sheet, which is a peeling sheet on the measurement surface side in a laminate for measuring light peel force, is performed. Hard peeling force (unit: mN / 50mm) was measured. The resulting light peeling force was 73 mN / 50 mm.

(2) Measurement of heavy peeling force

By the said method, the laminated body for light peel force measurement was produced separately. The light peeling sheet of this laminated body was peeled off, and one surface of the base material adhesive layer was revealed. One surface of a polyester film (PET25A4100 manufactured by Toyobo Co., Ltd.) having a thickness of 25 μm is affixed to the surface exposed, and a heavy-peel sheet, a base material pressure-sensitive adhesive layer, and the polyester film are arranged in this order to produce a laminate. This was made into the laminated body for heavy peeling force measurement. The peeling force (heavy peeling force) of the heavy peeling sheet was measured using this laminated body for heavy peeling force measurement. In other words, in accordance with JIS Z0237, under a condition of 23 ° C. and a relative humidity of 50%, a 180 ° pulling-off method of bending the heavy peeling sheet, which is the peeling sheet on the measurement surface side in the heavy peeling force measuring laminate, was performed. Lyric force (unit: mN / 50mm) was measured. The resulting heavy peeling force was 160 mN / 50 mm.

[Test Example 2]

About each of the rolls obtained by the Example and the comparative example, it partially unwound and peeled the light peeling sheet. At this time, it was observed whether or not adhesion occurred. When the adhesion occurred, the classification (end, spot, both of them) of the attachment was also confirmed.

The results are shown in Table 1.

Adherence The presence or absence Occurrence Example 1 radish - Example 2 radish - Example 3 radish - Comparative Example 1 U End Comparative Example 2 U End Comparative Example 3 U Spot, end

As can be seen from Table 1, no sticking occurred in the baseless double-sided tape obtained in the examples satisfying the requirements of the present invention.

The base material-less double-sided tape of this invention can be used suitably for uses, such as a member for bonding of an optical element.

10... Baseless Double Sided Adhesive Tape
One… Light peeling sheet
1a... Light peeling support
1b... Light release layer
1c... Light release layer side main surface
1d, 1e... No adhesive area
2… Baseless adhesive layer
3... Heavy peeling sheet
3a... Heavy peeling support
3b... Heavy release layer
1f... Width section of hard peeling sheet
2A... Cross section of the width direction of the base material adhesive layer
2B... Blown adhesive
20... First raw material
1g, 1g ', 1g ", 1h, 1h', 1h"... No adhesive area
2 ', 2 "… baseless pressure-sensitive adhesive layer (end side baseless pressure-sensitive adhesive layer, inner side baseless pressure-sensitive adhesive layer)
2a, 2a ', 2a "... One main surface in a baseless adhesive layer (end side base material adhesive layer, an inside side baseless adhesive layer)
2b, 2b ', 2b "... The other principal surface in a baseless adhesive layer (end side baseless adhesive layer, an inside side baseless adhesive layer)
3c... Heavy release layer side main surface
10 ', 10 "… Baseless Double Sided Adhesive Tape
21, 21 ', 21 "… Long cut pieces obtained by cutting the first raw material (substrateless double-sided adhesive tape)
30... Second raw material
30a, 30b... Width direction cross section of 2nd raw material
30c, 30d... Near both ends in the width direction of the second raw material
30e, 30f... Part where blade of half cut in 2nd raw materials enters
31... First laminated sheet
31a, 31b, 31c... The laminated sheet in which the first laminated sheet is half cut from the heavy peeling sheet side
40... Third raw material
4… Process Release Sheet
41... The laminated body which consists of a baseless adhesive layer and heavy peeling sheet which one main surface was exposed to
50... Baseless Double Sided Adhesive Tape
51... Light peeling sheet
52... Baseless adhesive layer
52a... Adhesive composition
52b... Residual Adhesive on Spots
53... Heavy peeling sheet
60... Baseless Double Sided Adhesive Tape
61... Light peeling sheet
61a... Width section of hard peeling sheet
62... Baseless adhesive layer
62a... Extruded Adhesive Composition
62b... The sticky composition which wetted toward the light peeling sheet 61 side among the sticky adhesive composition 62a which protruded
62c... The adhesive composition which wetted toward the heavy peeling sheet 63 side among the adhesive composition 62a protruded, and expanded
62d... A part of the adhesive composition located in the width direction edge part of the base material adhesive layer 62
62e... Residual adhesive at the end
63... Heavy peeling sheet
63a... Width direction cross section of heavy peeling sheet 63
64... Interface between the widthwise end surface 61a of the light peeling sheet 61 and the adhesive composition 62b which wetted and widened
65... Interface between the cross section 63a in the width direction of the heavy peeling sheet 63 and the adhesive composition 62c wetted and widened

Claims (7)

A light peeling sheet, a baseless adhesive layer, and a heavy peeling sheet are provided, and the peeling surface of the said light peeling sheet is in contact with one main surface in the said baseless adhesive layer, and the peeling surface of the said heavy peeling sheet is in contact with the other main surface. As a manufacturing method of a long baseless double-sided adhesive tape,
In the base material double-sided tape,
Peel force (F _L) and the peel force (F _H) of the jungbak Lee sheet of the hard release sheet is to satisfy the following formula (1),
F _H -F _L ≥10mN / 50mm (1)
The peeling surface of the said light peeling sheet is equipped with the area | region in which the said baseless adhesive layer is not laminated by the width direction both ends,
As for the peeling surface of the said heavy peeling sheet, the said base-less adhesive layer is laminated | stacked on the whole area | region in the width direction,
The manufacturing method,
The peeling force with respect to the said peeling force of the peeling sheet of the heavy peeling sheet, the base material-less adhesive layer, and the peeling surface with respect to the said base-less adhesive layer of the peeling surface of the said peeling sheet is provided with the process peeling sheet, Raw material formation process of preparing the long raw material which the peeling surface of the said peeling sheet for a process contacts with one main surface in the said base-less adhesive layer, and the peeling surface of the said heavy peeling sheet is in contact with the other main surface,
Peeling process of peeling the said process release sheet from the said raw material obtained by the said raw material formation process, and obtaining the laminated body which consists of the said base-less adhesive layer and the said heavy peeling sheet which one main surface was exposed, and
The light peeling sheet which is wider than the said base material adhesive layer in the said laminated body obtained by the said peeling process in the said main body-less adhesive layer side is bonded so that the peeling surface may bond, and the peeling surface of the said light peeling sheet is The sticking process of obtaining the said baseless double-sided adhesive tape which has the area | region in which the said baseless adhesive layer is not laminated by the width direction both ends is provided, The manufacturing method of the baseless double-sided adhesive tape characterized by the above-mentioned. A method for producing a pressure-sensitive adhesive roll comprising the step of winding the baseless double-sided pressure-sensitive adhesive tape according to claim 1 to obtain a pressure-sensitive adhesive roll made of a wound body. delete delete delete delete delete

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