JP2005325249A - Release liner, ultraviolet-curing pressure-sensitive adhesive sheet, and method for cutting the pressure-sensitive adhesive sheet - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a release liner which, in cutting an ultraviolet-curing pressure-sensitive adhesive sheet, can impart excellent workability and excellent working precision and can prevent cutting teeth from being fouled. <P>SOLUTION: The release liner is one having as a support an ultraviolet-transmitting plastic support, wherein the plastic support has not ultraviolet-transmitting areas. It is preferable that the not ultraviolet-transmitting areas are contiguously and plurally formed along the longitudinal direction so as to form a specified pattern as a whole. It is preferable that the shape of each not ultraviolet-transmitting area coincides with the shape favorable for cutting the ultraviolet-curing pressure-sensitive adhesive sheet having an ultraviolet-curing pressure-sensitive adhesive layer protected with the release liner into a specified shape. The not ultraviolet-transmitting areas can be formed from an at least one not ultraviolet-transmitting layer selected from among a metallic layer, an ink layer, an ultraviolet-absorbing layer, and a nonmetallic inorganic material layer. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a release liner, an ultraviolet curable pressure-sensitive adhesive sheet using the release liner, and a method for cutting the pressure-sensitive adhesive sheet.

  In general, an ultraviolet curable pressure-sensitive adhesive sheet is produced by applying an ultraviolet curable pressure-sensitive adhesive to a base material and then wrapping it around a core. At this time, when the substrate is a film or sheet, the film is usually wound in a stretched state by applying a tension. Therefore, it may be compressed inward by the shrinkage force of the film or sheet, and the adhesive may leak from the adhesive layer to the side surface of the tape roll. In particular, an ultraviolet curable pressure-sensitive adhesive is inferior in cohesive force in a state before ultraviolet irradiation, and this phenomenon is remarkable.

  Also, when cutting such an ultraviolet curable adhesive sheet, the adhesive may fall off or protrude from the cut site, and may adhere to the cut site of the cut UV curable adhesive sheet or stain the cutting blade. Sometimes.

  In order to prevent the adhesive from falling off and protruding from the ultraviolet curable adhesive sheet and to prevent contamination by the adhesive during storage and use, for example, when cutting the ultraviolet curable adhesive sheet, the sheet A cutting method (refer to Patent Document 1) in which a portion to be cut is preliminarily UV-cured, or a side surface of the UV-curing pressure-sensitive adhesive sheet is cut in the longitudinal direction to be narrowed and wound into a roll. There has been proposed a method of irradiating (cutting part of an adhesive sheet) with ultraviolet rays (see Patent Document 2).

Japanese Patent Laid-Open No. 9-207097 JP 2002-338904 A

  However, when the ultraviolet curable adhesive sheet is cut, the portion to be cut of the sheet is previously cured with ultraviolet rays, or the ultraviolet curable adhesive sheet is narrowed by cutting in the longitudinal direction, and then wound into a roll. The method of irradiating the side surface (cutting part of the pressure-sensitive adhesive sheet) with ultraviolet light and curing the ultraviolet light is a simple cutting process such as cutting the width of the ultraviolet-curable pressure-sensitive adhesive sheet in the longitudinal direction. Although it can be said to be a suitable method, on the other hand, it is difficult to apply when UV curable adhesive sheets are cut into complex shapes (especially punching), and UV irradiation is used to irradiate ultraviolet rays before cutting. There is a problem that the configuration of the apparatus becomes complicated.

Accordingly, an object of the present invention is to provide excellent processing workability and processing accuracy even when the ultraviolet curable pressure-sensitive adhesive sheet is cut into a complicated shape, and also provides a pressure-sensitive adhesive to the cutting blade. An object of the present invention is to provide a release liner capable of suppressing or preventing adhesion of components, an ultraviolet curable pressure-sensitive adhesive sheet using the release liner, and a method for cutting the pressure-sensitive adhesive sheet.
Another object of the present invention is to release the adhesive component from the side surface of the ultraviolet curable pressure-sensitive adhesive sheet, and to improve the handleability during storage and transportation of the ultraviolet curable pressure-sensitive adhesive sheet. An object of the present invention is to provide a liner, an ultraviolet curable pressure-sensitive adhesive sheet using the release liner, and a method for cutting the pressure-sensitive adhesive sheet.

  As a result of diligent studies to achieve the above object, the present inventors have used a transparent plastic film as a base material as a release liner to be applied to an ultraviolet curable pressure-sensitive adhesive sheet, and the base material has an ultraviolet non-transmitting portion having a specific shape. Is used to produce an ultraviolet curable pressure-sensitive adhesive sheet by protecting the ultraviolet curable pressure-sensitive adhesive layer with the release liner, from the release liner side. After irradiating with ultraviolet rays, punching was performed along the approximate boundary line between the ultraviolet non-transparent part and the transparent part (the part where the ultraviolet non-transparent part is not formed). Excellent workability and accuracy Thus, the cutting process can be performed and the adhesive component does not adhere to the cutting blade. Moreover, it has been found that the adhesive component does not protrude from the side surface of the ultraviolet curable pressure-sensitive adhesive sheet, and that the ultraviolet curable pressure-sensitive adhesive sheet can be stored and transported easily. The present invention has been completed based on these findings.

  That is, the present invention is a release liner based on a plastic substrate capable of transmitting ultraviolet light, wherein the plastic substrate is partially formed with an ultraviolet non-transmitting portion. Provide a liner.

  It is preferable that a plurality of the ultraviolet non-transmissive portions are continuously formed in the longitudinal direction so as to have a predetermined pattern shape as a whole. In addition, the shape of one ultraviolet non-transmitting portion corresponds to the shape when the ultraviolet curable pressure-sensitive adhesive sheet having the ultraviolet curable pressure-sensitive adhesive layer protected by the release liner is cut into a predetermined shape. Is preferred. The ultraviolet non-transmitting portion can be formed by at least one ultraviolet non-transmitting layer selected from a metal layer, an ink layer, an ultraviolet absorber layer, and a non-metallic inorganic layer.

  The present invention is also an ultraviolet curable adhesive sheet having an ultraviolet curable adhesive layer, wherein the release liner is laminated on at least one surface of the ultraviolet curable adhesive layer. An ultraviolet curable adhesive sheet is provided. In this ultraviolet curable pressure-sensitive adhesive sheet, it is preferable that the ultraviolet curable pressure-sensitive adhesive layer at a portion corresponding to the ultraviolet transmissive portion where the ultraviolet non-transmissive portion is not formed is cured by ultraviolet irradiation from the release liner side. Further, after the UV curable pressure-sensitive adhesive layer corresponding to the UV transmitting portion is cured, the cutting liner may be cut along a substantially boundary line between the UV non-transmitting portion and the UV transmitting portion of the release liner. Good.

  The present invention is also a method of cutting an ultraviolet curable pressure-sensitive adhesive sheet into a predetermined shape, wherein ultraviolet rays are applied from the release liner side to a laminate in which the ultraviolet curable pressure-sensitive adhesive layer and the release liner are laminated. After irradiating and curing the UV curable pressure-sensitive adhesive layer corresponding to the UV transmitting portion where the UV non-transmitting portion is not formed, on the substantially boundary portion between the UV non-transmitting portion and the UV transmitting portion of the release liner A method for cutting an ultraviolet curable pressure-sensitive adhesive sheet, characterized in that cutting is performed along a cutting line.

  According to the release liner of the present invention, excellent workability and accuracy can be imparted even when the ultraviolet curable pressure-sensitive adhesive sheet is cut into a complicated shape, and adhesion to a cutting blade is achieved. Adhesion of the agent component can also be suppressed or prevented. Furthermore, the adhesive component does not protrude from the side surface of the ultraviolet curable pressure-sensitive adhesive sheet, and the handleability of the ultraviolet curable pressure-sensitive adhesive sheet during storage and transportation can be improved.

Hereinafter, embodiments of the present invention will be described with reference to the drawings as necessary. In addition, the same code | symbol may be attached | subjected to the same site | part or member.
[Peeling liner]
The release liner of the present invention uses a plastic substrate (ultraviolet transparent plastic substrate) that can transmit ultraviolet rays as a substrate, and an ultraviolet non-transmitting portion is partially formed on the plastic substrate. The ultraviolet transparent plastic substrate as the substrate is not particularly limited as long as it is a plastic substrate capable of transmitting ultraviolet rays. The UV transparent plastic substrate has an UV transmittance of 50% or more (preferably 75% or more, more preferably 90% or more) in order to quickly cure the UV curable adhesive layer by UV irradiation. Is desirable.

  The material (material) of the ultraviolet light transmissive plastic substrate is not particularly limited as long as it has ultraviolet light transparency. For example, olefin resin [for example, ethylene such as polyethylene, polypropylene, ethylene-propylene copolymer, etc. -Α-olefin copolymer (block copolymer or random copolymer), and mixtures thereof, etc.], polyamide, polyimide, polyester (for example, polyethylene terephthalate), polystyrene, polyvinyl chloride and other plastic materials Is mentioned. The ultraviolet light transmissive plastic substrate may be composed of only one kind of plastic material or may be composed of a mixture of two or more kinds of plastic materials. Further, the ultraviolet light transmissive plastic substrate may have a single layer form or may have a laminated form.

  Further, the thickness of the ultraviolet light transmissive plastic substrate is not particularly limited, and can be appropriately selected according to the thickness of the intended release liner. The thickness of the ultraviolet light transmissive plastic substrate may be, for example, about 1 to 500 μm (preferably 15 to 150 μm). Therefore, the ultraviolet light transmissive plastic substrate may have a film shape or a sheet shape.

  As the release liner, a release treatment agent layer may be formed on at least one surface of the ultraviolet light transparent plastic substrate. The release treatment agent for forming such a release treatment agent layer is not particularly limited, and examples thereof include a long-chain alkyl group-containing polymer, a silicone polymer (silicone release agent), and a fluorine-based polymer (fluorine release agent). Can be mentioned. These release treatment agents can be used alone or in combination. When the release treatment agent layers are formed on both surfaces of the UV transparent plastic substrate, the release treatment agents for forming both release treatment agent layers may be the same or different. May be.

  When the UV transparent plastic substrate itself is a highly peelable plastic material, the surface of the UV transparent plastic substrate can be used as a release surface, so the release treatment agent layer is not formed. Also good.

  In the release liner of the present invention (sometimes referred to as “ultraviolet non-transparent part-containing release liner”), an ultraviolet non-transparent part is partially formed on the ultraviolet transparent plastic substrate. The ultraviolet non-transmitting portion is partially formed inside or on the surface (particularly the surface) of the UV transparent plastic substrate, and the UV non-transmitting portion in the UV non-transmitting portion-containing release liner is formed. The part has a configuration in which little or no ultraviolet light is transmitted from one surface to the other surface of the release liner containing the ultraviolet non-transmissive portion, and transmission of ultraviolet light is suppressed or prevented. As such an ultraviolet non-transmission part, when the release treatment agent layer is formed on one side of the ultraviolet light transparent plastic substrate, for example, the side where the release treatment agent layer is not formed on the ultraviolet light transparent plastic substrate. It can form suitably on the surface of.

  As shown in FIG. 1, the ultraviolet non-transmitting portion preferably has a configuration in which a plurality of continuous portions are formed in the longitudinal direction so as to have a predetermined pattern shape as a whole. . FIG. 1 is a schematic plan view partially showing an example of the release liner of the present invention as viewed from above. In FIG. 1, reference numeral 1 denotes a long strip-like release liner, 2 denotes an ultraviolet light transmissive plastic substrate, and 3 denotes an ultraviolet light non-transmissive part. The release liner 1 in FIG. 1 has a long strip shape, and a plurality of ultraviolet non-transmitting portions 3 are continuously formed in the longitudinal direction of the ultraviolet transparent plastic substrate 2. Moreover, the ultraviolet non-transmission part 3 continuously formed in the longitudinal direction has a predetermined pattern shape as a whole.

  As shown in FIG. 1, a plurality of ultraviolet non-transmitting portions 3 may be formed, or only one may be formed. When a plurality of ultraviolet non-transmitting portions 3 are formed, it is preferable that a plurality of ultraviolet non-transmissive portions 3 are continuously formed in the longitudinal direction so as to have a predetermined pattern shape as a whole.

  As the shape of one ultraviolet non-transmissive part, an ultraviolet curable pressure-sensitive adhesive sheet having an ultraviolet curable pressure-sensitive adhesive layer protected by an ultraviolet non-transmissive part-containing release liner is cut into a predetermined shape (particularly punching). It is important to correspond to the shape of the case. Specifically, as the shape of one ultraviolet non-transmitting portion (for example, when a plurality of ultraviolet non-transmitting portions are formed as shown in FIG. 1, as the shape of each ultraviolet non-transmitting portion 3), It can be appropriately selected according to the shape (specification) of the target (necessary after the cutting process), such as a substantially triangular shape, a substantially polygonal shape such as a substantially square shape, a substantially circular shape, In addition to a substantially circular shape such as a substantially elliptical shape, a frame shape, an indefinite shape, and the like can be given. As described above, the shape of the ultraviolet non-transmitting portion (for example, each ultraviolet non-transmitting portion when a plurality of ultraviolet non-transmitting portions are formed) is different from the conventional shape and may be a complicated shape. Therefore, when cutting an ultraviolet curable pressure-sensitive adhesive sheet having an ultraviolet curable pressure-sensitive adhesive layer protected by an ultraviolet non-transparent part-containing release liner, a complicated cutting method that has been difficult in the past, such as a punching method. Even it can be used.

  The shape of the ultraviolet non-transmitting portion may be the same shape as the shape finally cut (for example, punched), but is preferably a slightly smaller similar shape. . By making the shape of the ultraviolet non-transmitting portion a similar shape slightly smaller than the shape to be finally cut, in a cutting portion when performing cutting (for example, a punching portion when performing punching) Since the UV curable adhesive layer can be cured, cutting (especially punching) can be performed with excellent workability and accuracy, and adhesion of adhesive components to the cutting blade is almost impossible. Or, it does not occur at all, and contamination of the cutting blade can be suppressed or prevented. In the present invention, the end of the ultraviolet curable pressure-sensitive adhesive layer in which the irradiated ultraviolet ray is blocked by the ultraviolet non-transparent portion even when the shape of the ultraviolet non-transparent portion is the same as the shape finally cut. By slightly penetrating the part, the vicinity of the end part is also affected by ultraviolet rays and becomes cured, so that cutting is performed along the boundary line between the ultraviolet non-transmissive part and the ultraviolet transmissive part. However, cutting can be performed with excellent processing workability and processing accuracy, and contamination of the cutting blade by the adhesive component can be suppressed or prevented.

  As described above, in the present invention, the cutting process such as the punching process is performed with a substantially boundary line between the ultraviolet non-transmission part and the ultraviolet transmission part (for example, the boundary line between the ultraviolet non-transmission part and the ultraviolet transmission part, or the ultraviolet non-transmission part). (Similarly larger lines).

  In particular, an ultraviolet non-transparent part-containing release liner is used whose end is an ultraviolet transparent part (that is, an ultraviolet non-transparent part that is adjusted or controlled so that the ultraviolet non-transparent part is not located at the end) Using the contained release liner), the edge of the UV curable pressure sensitive adhesive sheet is cured at the time of UV irradiation, and by using a punching method, the adhesive component protrudes from the side surface of the UV curable pressure sensitive adhesive sheet. It can be set as the structure which does not produce. Therefore, for example, an ultraviolet curable pressure-sensitive adhesive sheet having an ultraviolet curable pressure-sensitive adhesive layer protected by an ultraviolet non-transparent part-containing release liner is wound into a roll after ultraviolet irradiation or after cutting (particularly after punching). Even if it is rotated, the handling property during storage and transportation can be improved.

  The configuration of the ultraviolet non-transmissive portion is not particularly limited as long as it has a function of not transmitting ultraviolet light from one surface to the other surface. For example, the ultraviolet non-transmissive portion can be formed by an ultraviolet non-transmissive layer. . Such an ultraviolet non-transparent layer is not particularly limited as long as it is composed of various materials having an ultraviolet non-transmission function. For example, a metal layer, an ink layer, an ultraviolet absorber layer, a non-metallic inorganic layer Etc. The ultraviolet impermeable layer may be composed of only one kind of ultraviolet impermeable layer, or may be composed of a combination of two or more kinds of ultraviolet impermeable layers. Specifically, for example, a part of one ultraviolet non-transmitting part is formed of a metal layer, and the remaining part is an ultraviolet non-transmitting layer other than the metal layer (for example, an ink layer, an ultraviolet absorber layer, a non-metallic inorganic layer). Etc.), and the entire ultraviolet non-transparent portion is at least one selected from a metal layer, an ink layer, an ultraviolet absorber layer, and a non-metallic inorganic layer (usually two or more types). It may be formed of a laminate of the ultraviolet non-transparent layer. In addition, when a plurality of ultraviolet non-transmitting portions are formed, some of the UV non-transmitting portions are formed of a metal layer, and the remaining UV non-transmitting portions are UV non-transmitting layers other than the metal layer (for example, an ink layer, It may have a form formed by an ultraviolet absorber layer, a nonmetallic inorganic layer, or the like.

  In the case of forming the ultraviolet non-transmissive portion with a metal layer, for example, a known metal layer forming means such as a metal vapor deposition means or a sticking means for a metal sheet (for example, a metal foil such as an aluminum foil) is used. Can be formed. In addition, as a metal compound which comprises a metal layer, if it is a metal compound (a metal simple substance is included), it will not restrict | limit, For example, an aluminum compound, an iron compound, a copper compound, a silver compound, a gold compound etc. are mentioned, Aluminum A compound can be preferably used. As the metal compound, a single metal compound may be used, or two or more metal compounds may be used in combination.

  When the ultraviolet non-transmitting portion is formed of an ink layer, an ultraviolet absorber layer, or a non-metallic inorganic layer, it can be formed using a printing means. Therefore, the ink layer, the ultraviolet absorber layer, and the non-metallic inorganic layer as the ultraviolet non-transmissive portion may be a printing layer. The ink constituting the ink layer is not particularly limited, but black ink is preferable. As the ink, an ink containing a metal pigment can also be used.

  The ultraviolet absorber constituting the ultraviolet absorber layer is not particularly limited. For example, a benzophenone ultraviolet absorber, a benzotriazole ultraviolet absorber, a salicylic acid derivative ultraviolet absorber, a triazine derivative ultraviolet absorber, or a cinnamic acid derivative. System ultraviolet absorbers, cyanoacrylate ultraviolet absorbers, p-aminobenzoic acid ultraviolet absorbers, dibenzoylmethane ultraviolet absorbers, hindered amine ultraviolet absorbers, and the like.

  The nonmetallic inorganic material constituting the nonmetallic inorganic layer is not particularly limited, and examples thereof include carbon, ceramics, and glass wool.

  Such inks, ultraviolet absorbers, and non-metallic inorganic materials may each be used with only a single component or may be used in combination of two or more components. In addition, the ink layer, the ultraviolet absorber layer, the nonmetallic inorganic material layer, and the like may contain components of other layers in each layer. For example, the ink layer contains the ultraviolet absorber or the nonmetallic inorganic material. May be included.

  The thickness of the ultraviolet light impermeable layer constituting the ultraviolet light impermeable portion is not particularly limited as long as the ultraviolet light impermeability can be exhibited, and is, for example, 0.1 to 1000 μm (preferably 0.1 to 100 μm, more preferably 0. It can be selected from a range of about 1 to 50 μm).

  The ultraviolet light non-transmissive part-containing release liner of the present invention can be produced by forming an ultraviolet light non-transmissive part at a predetermined site of a plastic substrate using a known metal layer forming means, printing means, or the like. . At this time, if the plastic base material is not formed of a highly peelable plastic material, the release treatment agent is dried on at least one surface of the ultraviolet light transparent plastic base material before or after the formation of the ultraviolet light opaque part. A release treatment layer can be formed by applying and drying later in a coating amount with a predetermined thickness.

  In addition, it does not restrict | limit especially as thickness of an ultraviolet-ray non-transmissive part containing peeling liner, For example, it can select from the range of about 1-500 micrometers (preferably 15-150 micrometers, More preferably, 20-125 micrometers).

  As described later, the UV non-transparent part-containing release liner has a release surface on both sides or only one of the release surfaces according to the form of the UV-curable adhesive sheet. Things can be used.

[UV curable adhesive sheet]
The ultraviolet curable pressure-sensitive adhesive sheet of the present invention has an ultraviolet curable pressure-sensitive adhesive layer, and the ultraviolet light non-transmissive part-containing release liner is formed on at least one surface (adhesive surface) of the ultraviolet curable pressure-sensitive adhesive layer. It has a laminated structure so that the release surface of the ultraviolet light non-transmissive part-containing release liner is in contact. Therefore, the UV-curable pressure-sensitive adhesive sheet cures the UV-curable pressure-sensitive adhesive layer at the site corresponding to the UV-transmitting part where the UV-non-transmitting part is not formed by irradiating the UV from the UV non-transmitting part-containing release liner side. In addition, the ultraviolet curable type of the portion corresponding to the ultraviolet transmissive portion where the ultraviolet non-transmissive portion is not formed by ultraviolet irradiation from the ultraviolet transmissive portion-containing release liner side in advance. The pressure-sensitive adhesive layer may be cured.

  The UV curable pressure-sensitive adhesive sheet can be subjected to cutting processing (particularly punching processing) so as to have a predetermined shape after the UV curable pressure-sensitive adhesive layer corresponding to the UV transmitting portion is cured. First, after curing the UV curable pressure-sensitive adhesive layer at the site corresponding to the UV transmitting portion, a substantially boundary line between the UV transmitting portion and the UV transmitting portion of the release liner containing the UV transmitting portion (for example, UV blocking) A cutting process (particularly a punching process) may be performed along a boundary line between the transmitting part and the ultraviolet transmitting part or a line having a similar shape slightly larger than the ultraviolet non-transmitting part.

  In the ultraviolet curable pressure-sensitive adhesive sheet of the present invention, it is important that the ultraviolet curable pressure-sensitive adhesive layer corresponding to the ultraviolet non-transmitting portion is not cured. This is because when using an ultraviolet curable pressure-sensitive adhesive sheet having a predetermined shape obtained by cutting, an ultraviolet curable pressure-sensitive adhesive layer corresponding to the ultraviolet non-transmitting portion is used. In other words, an ultraviolet curable adhesive sheet having a predetermined shape having an uncured ultraviolet curable adhesive layer is obtained by cutting. In addition, the edge part of the ultraviolet curable adhesive layer of the site | part corresponding to an ultraviolet non-transmitting part may be hardened | cured.

  Specifically, the ultraviolet curable pressure-sensitive adhesive sheet is prepared in advance as an ultraviolet curable pressure-sensitive adhesive sheet having an ultraviolet curable pressure-sensitive adhesive layer protected by a release liner having a normal configuration that does not have an ultraviolet non-transmissive portion. It may be an ultraviolet curable pressure-sensitive adhesive sheet obtained by peeling off a normal configuration release liner and laminating the ultraviolet light non-transparent part-containing release liner of the present invention on the ultraviolet curable pressure-sensitive adhesive layer. An ultraviolet curable pressure-sensitive adhesive sheet obtained in advance using an ultraviolet light non-transparent part-containing release liner is suitable when forming the pressure-sensitive adhesive layer. As such an ultraviolet curable pressure-sensitive adhesive sheet (an ultraviolet curable pressure-sensitive adhesive sheet obtained in advance by using an ultraviolet light non-transparent part-containing release liner at the time of forming the ultraviolet ray curable pressure-sensitive adhesive layer), an ultraviolet non-transparent part-containing release liner is used. An ultraviolet curable pressure-sensitive adhesive sheet obtained by applying an ultraviolet curable pressure-sensitive adhesive on the release surface to form an ultraviolet curable pressure-sensitive adhesive layer is suitable. In addition, in the ultraviolet curable pressure-sensitive adhesive sheet in which the ultraviolet light non-transparent part-containing release liner is used, the other surface of the ultraviolet curable pressure-sensitive adhesive layer on the opposite side to the ultraviolet light non-transparent part-containing release liner (usually a release liner (usually In addition to the release liner, other layers such as a substrate may be formed. For example, when the substrate is formed, another adhesive layer (ultraviolet curing) is further formed on the substrate. Other layers such as a mold pressure-sensitive adhesive layer and an ultraviolet non-curable pressure-sensitive adhesive layer) may be formed. Accordingly, the ultraviolet curable pressure sensitive adhesive sheet using the ultraviolet light non-transmissive part-containing release liner is a single-sided pressure sensitive adhesive sheet in which an ultraviolet curable pressure sensitive adhesive layer is formed only on one side, The pressure-sensitive adhesive layer may be any form of a double-sided pressure-sensitive adhesive sheet on which an ultraviolet curable pressure-sensitive adhesive layer is formed.

  In the present invention, as the ultraviolet curable pressure sensitive adhesive sheet using the ultraviolet light non-transmissive part-containing release liner, in particular, an ultraviolet curable pressure sensitive adhesive sheet (baseless UV curable pressure sensitive adhesive sheet) having no substrate is used. It can be used suitably. As a substrate-less UV curable adhesive sheet using such an UV non-transparent part-containing release liner, a release liner having a release surface on one side is laminated on each surface of the UV curable adhesive layer. And an ultraviolet curable pressure-sensitive adhesive sheet in which at least one release liner is an ultraviolet non-transparent part-containing release liner, and has an ultraviolet non-transparent part and both surfaces are release surfaces. It may be an ultraviolet curable pressure-sensitive adhesive sheet having an ultraviolet curable pressure-sensitive adhesive layer formed on one surface of the liner.

  An ultraviolet curable adhesive sheet in which a release liner having a release surface on one side is laminated on each surface of the ultraviolet curable adhesive layer is an ultraviolet non-transparent part-containing release liner / UV curable adhesive. Layer configuration of release layer / release liner, release liner / UV curable pressure sensitive adhesive layer / layer configuration of release liner containing UV non-transmissive part, or UV light non-transmissive part-containing release liner / UV curable pressure sensitive adhesive layer / UV non-transmissive part containing It has a layer structure of a release liner, may be formed in a form wound in a roll shape, or may be formed in a form in which sheets are laminated. In this case, in use, one of the release liners is peeled and removed and attached to the member, and the other release liner is peeled and removed. It is preferable that the adhesive property of the release liner on the side to be exposed to the ultraviolet curable pressure-sensitive adhesive layer is smaller than the adhesive property of the release liner on the side to be peeled and removed later to the ultraviolet curable pressure-sensitive adhesive layer. With such a configuration, the release liner that is peeled and removed first can be smoothly peeled off from the UV curable pressure-sensitive adhesive layer, and alternately peeled to damage the UV curable pressure-sensitive adhesive layer. This can be prevented.

  On the other hand, as an ultraviolet curable pressure-sensitive adhesive sheet having an ultraviolet curable pressure-sensitive adhesive layer formed on one surface of a release liner having an ultraviolet non-transmissive portion and both surfaces being peeled surfaces, an ultraviolet non-transmissive portion And an ultraviolet curable pressure-sensitive adhesive layer is formed on one surface of the release liner having both surfaces as release surfaces, and the other surface of the release liner is the other surface of the ultraviolet curable pressure-sensitive adhesive layer. UV curable pressure sensitive adhesive on one surface of a release liner that has an ultraviolet non-transmissive part and both surfaces are peeled surfaces. The sheet-like laminate in which the layers are formed may be formed in a form in which the surfaces of the release liners of the different sheet-like laminates and the surfaces of the ultraviolet curable pressure-sensitive adhesive layer are laminated. In this case, it is preferable that the release surfaces on both sides of the release liner have different adhesiveness to the ultraviolet curable pressure-sensitive adhesive layer. The reason is the same as described above.

[UV curable adhesive layer]
As long as the ultraviolet curable pressure-sensitive adhesive layer has ultraviolet curable properties, the type and material of the ultraviolet curable pressure-sensitive adhesive are not particularly limited. As the UV-curable pressure-sensitive adhesive, generally, a pressure-sensitive adhesive containing an adhesive polymer component and an UV-curable component is used, but an unsaturated double bond is added to the side chain of the adhesive polymer. Those containing the ultraviolet curable polymer in the form can also be used. An ultraviolet curing adhesive can be used individually or in combination of 2 or more types.

  In addition, the thickness in particular of an ultraviolet curable adhesive layer is not restrict | limited, For example, it can select from the range of about 5-300 micrometers (preferably 10-100 micrometers).

  The ultraviolet curable pressure-sensitive adhesive layer may have a single layer form or a laminated form.

(Adhesive polymer component)
In the ultraviolet curable adhesive, the adhesive polymer component is not particularly limited, and examples thereof include base polymers in various adhesives such as rubber adhesives, acrylic adhesives, silicone adhesives, and polyvinyl ether adhesives. It is done. An adhesive polymer component can be used individually or in combination of 2 or more types.

  As the adhesive polymer component, an acrylic polymer which is a base polymer in the acrylic adhesive is preferable. As such an acrylic polymer, a (meth) acrylic acid ester polymer having (meth) acrylic acid ester (acrylic acid ester, methacrylic acid ester) as a main monomer component can be used. Examples of the (meth) acrylic acid ester include (meth) acrylic acid alkyl esters shown below, (meth) acrylic acid cycloalkyl esters such as cyclohexyl (meth) acrylic acid, and phenyl (meth) acrylic acid. Examples include (meth) acrylic acid aryl esters.

  As the acrylic polymer, in particular, a (meth) acrylic acid alkyl ester polymer having a (meth) acrylic acid alkyl ester as a main monomer component can be suitably used. The (meth) acrylic acid alkyl ester polymer may be a polymer (homopolymer) of only one kind of (meth) acrylic acid alkyl ester, (meth) acrylic acid alkyl ester, and other (meta) ) Acrylic acid alkyl esters, (meth) acrylic acid cycloalkyl esters, (meth) acrylic acid aryl esters, and copolymers with copolymerizable monomers that can be copolymerized with (meth) acrylic acid alkyl esters It may be. That is, in the (meth) acrylic acid alkyl ester-based polymer, monomer components such as (meth) acrylic acid alkyl ester may be used singly or in combination of two or more.

Examples of the (meth) acrylic acid alkyl ester in the acrylic polymer include, for example, methyl (meth) acrylate, ethyl (meth) acrylate, propyl (meth) acrylate, isopropyl (meth) acrylate, and (meth) acrylic acid. Butyl, isobutyl (meth) acrylate, s-butyl (meth) acrylate, t-butyl (meth) acrylate, pentyl (meth) acrylate, hexyl (meth) acrylate, heptyl (meth) acrylate, (meta ) Octyl acrylate, 2-ethylhexyl (meth) acrylate, isooctyl (meth) acrylate, nonyl (meth) acrylate, isononyl (meth) acrylate, decyl (meth) acrylate, isodecyl (meth) acrylate, ( Undecyl (meth) acrylate, dodecyl (meth) acrylate, (me ) Tridecyl acrylate, tetradecyl (meth) acrylate, pentadecyl (meth) acrylate, hexadecyl (meth) acrylate, heptadecyl (meth) acrylate, octadecyl (meth) acrylate, nonadecyl (meth) acrylate, (meth) Examples include (meth) acrylic acid C _1-20 alkyl esters such as eicosyl acrylate [preferably (meth) acrylic acid C _1-12 alkyl esters].

  In addition, as a copolymerizable monomer which can be copolymerized with respect to the acrylic polymer, various known monomers can be used as monomers for modifying the acrylic pressure-sensitive adhesive. Specifically, as the modifying monomer, for example, (meth) acrylic acid (acrylic acid, methacrylic acid), itaconic acid, maleic acid, fumaric acid, crotonic acid and other carboxyl group-containing monomers; maleic anhydride, anhydrous Acid anhydride group-containing monomers such as icotanic acid; 2-hydroxyethyl (meth) acrylate, 3-hydroxypropyl (meth) acrylate, 4-hydroxybutyl (meth) acrylate, 6-hydroxyhexyl (meth) acrylate Hydroxyl group-containing monomers such as; epoxy group-containing acrylic monomers such as glycidyl (meth) acrylate; vinyl ester monomers such as vinyl acetate and vinyl propionate; cyanoacrylate monomers such as acrylonitrile and methacrylonitrile; Acrylamide, N, N-dimethyl (N-substituted) amide monomers such as (meth) acrylamide, N-butyl (meth) acrylamide, N-hydroxy (meth) acrylamide; aminoethyl (meth) acrylate, N, N-dimethylamino (meth) acrylate (Meth) acrylate aminoalkyl monomers such as ethyl and (meth) acrylate t-butylaminoethyl; styrene, vinyltoluene, benzyl (meth) acrylate, phenoxyethyl (meth) acrylate, phenoxydiethylene glycol (meth) acrylate, etc. Aromatic ring-containing monomers; (meth) acrylic acid alkoxyalkyl monomers such as methoxyethyl (meth) acrylate and ethoxyethyl (meth) acrylate; olefin monomers such as ethylene, propylene, isoprene and butadiene; Vinyl ether monomers such as ether and the like. The modifying monomers can be used alone or in combination of two or more.

  As the acrylic polymer, one prepared by a known polymerization method (for example, solution polymerization method, emulsion polymerization method, bulk polymerization method, etc.) can be used.

  As the acrylic polymer, a (meth) acrylic acid ester having a glass transition temperature of 20 ° C. or lower is suitable.

(UV curing component)
Examples of the ultraviolet curable component include a reaction by an ultraviolet curable component [for example, a reaction between ultraviolet curable components and a reaction between an ultraviolet curable component and another component in an adhesive layer (for example, an acrylic polymer) by ultraviolet irradiation. ] Can be used. Specifically, as an ultraviolet curing component, a compound (monomer, oligomer, polymer, or the like) having at least one group containing an unsaturated double bond (unsaturated double bond-containing group) in the molecule is used. In particular, non-volatile compounds are suitable. An ultraviolet curing component can be used individually or in combination of 2 or more types.

  As the unsaturated double bond-containing group in the ultraviolet curable component, a group containing a carbon-carbon double bond (carbon-carbon double bond-containing group) is particularly preferable, and as the carbon-carbon double bond-containing group, Examples thereof include ethylenically unsaturated bond-containing groups such as vinyl group, allyl group, and (meth) acryloyl group. An unsaturated double bond containing group can be used individually or in combination of 2 or more types. In addition, in one molecule of the ultraviolet curable component, the number of unsaturated double bond-containing groups is preferably 2 or more. When the ultraviolet curing component has two or more unsaturated double bond-containing groups in one molecule, two or more of the same unsaturated double bond-containing groups may be used. A double bond-containing group may be used.

  Examples of ultraviolet curing components include esterified products of (meth) acrylates and polyhydric alcohols, ester acrylic compounds, urethane acrylic compounds, cyanurate compounds having unsaturated double bond-containing groups, and unsaturated double bonds. Examples include isocyanurate compounds having a containing group.

More specifically, as an ultraviolet curing component, for example, di (meth) acrylate of alkylene glycol [(meth) acrylic acid di (alkylene glycol) ester; for example, di (meth) acrylate of tetraethylene glycol, polyethylene glycol Di (meth) acrylate, di (meth) acrylate of propylene glycol, di (meth) acrylate of polypropylene glycol, di (meth) acrylate of 1,4-butylene glycol, di (meth) acrylate of 1,6-hexanediol, C _1-9 alkylene glycol such as di (meth) acrylate of neopentyl glycol or di (meth) acrylate of poly (C _1-9 alkylene glycol)], 2-propenyl-di-3-butenyl cyanurate, tris (2-hydroxy Di (meth) acrylate of chill) isocyanurate, di (meth) acrylate of diol obtained by adding 4 mol or more of ethylene oxide or propylene oxide to 1 mol of neopentyl glycol, diphenol of bisphenol A or a modified product thereof (Meth) acrylate, trimethylolpropane or its modified di (meth) acrylate, trimethylolpropane or its modified tri (meth) acrylate, tetramethylolmethanetetra (meth) acrylate, tris (2-hydroxyethyl) isocyanate Nurate tri (meth) acrylate, pentaerythritol tri (meth) acrylate, pentaerythritol tetra (meth) acrylate, dipentaerythritol poly (meth) acrylate, caprolactone-modified tris [(me Ta) acryloxyethyl] isocyanurate, poly (meth) acrylate of alkyl-modified dipentaerythritol, poly (meth) acrylate of caprolactone-modified dipentaerythritol, neopentyl glycol adipic acid-modified di (meth) acrylate, neopentyl hydroxypivalate Glycol di (meth) acrylate, hydroxypivalic acid ester modified neopentyl glycol di (meth) acrylate, caprolactone modified hydroxypivalic acid neopentyl glycol di (meth) acrylate, dioxane modified di (meth) acrylate, cyclopentanyl di (meth) Examples include acrylate, ethylene oxide-modified phosphoric acid di (meth) acrylate, and ethylene oxide-modified alkylated phosphoric acid di (meth) acrylate.

  Although it does not restrict | limit especially as a content rate of a ultraviolet curing component, For example, it is about 5-500 weight part (preferably 10-200 weight part) with respect to 100 weight part of adhesive polymer components (acrylic polymer etc.).

  In addition to the adhesive polymer component and the UV curable component, the UV curable adhesive, if necessary, a photopolymerization initiator, a crosslinking agent, a photoreaction accelerator, a tackifier, a filler, an anti-aging agent, Additives such as colorants (pigments and dyes), plasticizers, softeners, surfactants, and the like may be blended.

  The photopolymerization initiator is not particularly limited as long as it is a photopolymerization initiator that is activated by ultraviolet rays and can cause a reaction of an ultraviolet curing component. Specifically, examples of the photopolymerization initiator include acetophenone photopolymerization initiator, benzoin photopolymerization initiator, benzyl photopolymerization initiator, benzoin alkyl ether photopolymerization initiator, and benzophenone photopolymerization initiator. Ketal photopolymerization initiators, thioxanthone photopolymerization initiators, α-ketol photopolymerization initiators, aromatic sulfonyl chloride photopolymerization initiators, photoactive oxime photopolymerization initiators, and the like can be used. A photoinitiator can be used individually or in combination of 2 or more types.

  As the photopolymerization initiator, acetophenone photopolymerization initiators and benzoin photopolymerization initiators are suitable. As the acetophenone photopolymerization initiator, for example, 4-phenoxydichloroacetophenone, 4-t-butyl-dichloroacetophenone, diethoxyacetophenone, 1-phenyl-2-hydroxy-2-methylpropan-1-one, 1- [ 4- (2-hydroxyethyl) -phenyl] -2-hydroxy-2-methylpropan-1-one, 1-hydroxycyclohexyl phenyl ketone and the like. Examples of the benzoin photopolymerization initiator include benzoin.

  Examples of the benzyl photopolymerization initiator include benzyl. Examples of the benzoin alkyl ether photopolymerization initiator include benzoin methyl ether, benzoin ethyl ether, benzoin propyl ether, benzoin isopropyl ether, and benzoin isobutyl ether. Examples of the benzophenone photopolymerization initiator include benzophenone, benzoylbenzoic acid, 3,3′-dimethyl-4-methoxybenzophenone, polyvinyl benzophenone, α-hydroxycyclohexyl phenyl ketone, and the like. Examples of the ketal photopolymerization initiator include benzyl dimethyl ketal. Examples of the thioxanthone photopolymerization initiator include thioxanthone, 2-chlorothioxanthone, 2-methylthioxanthone, 2,4-dimethylthioxanthone, isopropylthioxanthone, 2,4-dichlorothioxanthone, 2,4-diethylthioxanthone, 2,4. -Diisopropyl thioxanthone, dodecyl thioxanthone, etc. are mentioned.

  Examples of the crosslinking agent include polyisocyanate crosslinking agents, melamine resins, urea resins, aziridine compounds, epoxy crosslinking agents (such as epoxy resins), low molecular compounds having a plurality of carboxyl groups and their anhydrides, polyamines, and the like. A polymer having a plurality of carboxyl groups can be used.

  The UV curable pressure-sensitive adhesive layer is applied to a predetermined surface (for example, the release surface of the UV non-transparent part-containing release liner), and the UV curable pressure-sensitive adhesive is applied in a coating amount so as to have a predetermined thickness after drying. Can be formed. The application (coating) of the UV curable pressure-sensitive adhesive when forming the UV-curable pressure-sensitive adhesive layer is performed by a conventional coater such as a gravure roll coater, a reverse roll coater, a kiss roll coater, a dip roll coater, a bar coater, or a die coater. A coater, a knife coater, a spray coater or the like.

[Cutting method of UV curable adhesive sheet]
In the ultraviolet curable pressure-sensitive adhesive sheet of the present invention, it is important that the ultraviolet curable pressure-sensitive adhesive layer at the site corresponding to the ultraviolet transmissive part is cured before cutting, and is cured in advance before cutting. It may be cured at the time of cutting. The ultraviolet curable pressure-sensitive adhesive layer corresponding to the ultraviolet transmissive part can be cured by irradiating ultraviolet rays from the ultraviolet non-transmissive part-containing release liner side. The ultraviolet light source (ultraviolet generator) to be irradiated is not particularly limited as long as it can efficiently emit ultraviolet light having a wavelength of 400 nm or less (for example, 200 to 400 nm). Examples include mercury lamps, ultra-high pressure mercury lamps, deuterium lamps, metal halide lamps, black lights, xenon lamps, and excimer lasers.

  The method of irradiating ultraviolet rays is not particularly limited as long as it is a method that can irradiate only a predetermined part, but any method can be used, but the entire ultraviolet curable pressure-sensitive adhesive layer is not cured and the predetermined part (in the ultraviolet transmitting part). It is preferable that the irradiation angle with respect to the surface of the release liner containing the UV non-transmissive portion is 90 degrees so that the UV curable pressure-sensitive adhesive layer of only the corresponding part) can be cured.

As the integrated light quantity of ultraviolet rays, for example, 50 to 5,000 mJ / cm ² is desirable. If the cumulative amount of UV light is too small, the reactivity of the UV curing reaction will decrease and the reaction will not proceed. If it is excessive, the curing reaction will proceed throughout the UV curable adhesive layer, causing UV curing. When using a mold pressure-sensitive adhesive sheet, ultraviolet curing properties may be lost, such being undesirable.

  As described above, the punching method can be suitably used as the method for cutting the ultraviolet curable pressure-sensitive adhesive sheet. In the present invention, even when processing into a complicated shape that requires punching, punching can be performed with excellent workability and processing accuracy, and the adhesive component adheres to the cutting blade. Can reduce or prevent contamination of the cutting blade. In particular, in the method using punching, the end portion of the ultraviolet curable pressure-sensitive adhesive sheet can be cured, so that the adhesive component does not protrude from the side surface of the ultraviolet curable pressure-sensitive adhesive sheet. Handling property at the time of storage and transportation of the curable pressure-sensitive adhesive sheet can be improved.

  Specifically, as a method for cutting the ultraviolet curable pressure-sensitive adhesive sheet, as shown in FIGS. 2 to 4, the ultraviolet curable pressure-sensitive adhesive layer and the ultraviolet light non-transmissive part-containing release liner were laminated. An ultraviolet ray in which an ultraviolet non-transparent part is not formed by irradiating a laminated body (for example, an ultraviolet curable pressure-sensitive adhesive sheet using an ultraviolet non-transparent part-containing release liner) from the ultraviolet non-transparent part-containing release liner side. After curing the UV curable adhesive layer at the part corresponding to the transmission part, a method of cutting along the substantially boundary part between the UV non-transmission part and the UV transmission part of the release liner containing the UV non-transmission part is adopted. can do. FIG. 2 is a schematic view illustrating a part of the method of cutting the ultraviolet curable pressure-sensitive adhesive sheet of the present invention, and is a diagram illustrating a state in which the ultraviolet curable pressure-sensitive adhesive sheet is irradiated with ultraviolet rays. FIG. 3 is a schematic view showing some steps of the method of cutting the ultraviolet curable pressure-sensitive adhesive sheet of the present invention, and curing occurs in a part of the ultraviolet curable pressure-sensitive adhesive layer by ultraviolet irradiation. It is a figure which shows a state. 3A is a front view (viewed from above), and FIG. 3B is a cross-sectional view. Furthermore, FIG. 4 is a schematic view showing a part of the method of cutting the ultraviolet curable pressure-sensitive adhesive sheet of the present invention, and is a view showing the ultraviolet curable pressure-sensitive adhesive sheet having a predetermined shape cut by the cutting process. is there. 4A is a front view (viewed from above), and FIG. 4B is a cross-sectional view. 2 to 4, 4 is an ultraviolet curable pressure-sensitive adhesive sheet using an ultraviolet non-transmissive part-containing release liner, 41 is an ultraviolet curable pressure-sensitive adhesive sheet after irradiation with ultraviolet light, and 42 is an ultraviolet curable pressure-sensitive adhesive sheet after cutting, 5 Is a release liner containing an ultraviolet non-transmission part, 51 is an ultraviolet non-transmission part, 52 is an ultraviolet transmission part, 5a is substantially the periphery of the ultraviolet non-transmission part 51 (substantially boundary part between the ultraviolet non-transmission part 51 and the ultraviolet transmission part 52), 6 is an ultraviolet curable pressure-sensitive adhesive layer, 61 is an uncured ultraviolet curable pressure-sensitive adhesive layer, 62 is a cured ultraviolet curable pressure-sensitive adhesive layer, and 7 is a release liner having a normal configuration (having no ultraviolet non-transmissive portion). A release liner 8) is an ultraviolet light source (ultraviolet generator).

  2 to 4, the ultraviolet curable pressure-sensitive adhesive sheet 4 in which the ultraviolet light non-transmissive part-containing release liner is used has an ultraviolet light non-transmissive part-containing release liner 5 formed on one surface of the ultraviolet curable pressure-sensitive adhesive layer 6. The other surface of the ultraviolet curable pressure-sensitive adhesive layer 6 has a laminate structure in which a release liner 7 having a normal configuration (a release liner not having an ultraviolet non-transmissive portion) 7 is laminated. In addition, the ultraviolet light non-transmission part-containing release liner 5 is partially formed with an ultraviolet light non-transmission part 51 on the surface thereof (surface opposite to the ultraviolet ray curable pressure-sensitive adhesive layer 6). The portion where the ultraviolet non-transmissive portion 51 is not formed on the surface of the ultraviolet non-transmissive portion-containing release liner 5 is an ultraviolet transmissive portion 52. As shown in FIG. 2, the ultraviolet curable pressure-sensitive adhesive sheet 4 is irradiated with ultraviolet rays from the ultraviolet non-transparent part-containing release liner 5 side using an ultraviolet light source (ultraviolet generator) 8 as shown in FIG. As shown in FIG. 4, the ultraviolet curable pressure-sensitive adhesive sheet 41 after ultraviolet irradiation is obtained by curing the ultraviolet curable pressure-sensitive adhesive layer 6 at a portion corresponding to the ultraviolet transmissive portion 52 where the ultraviolet non-transmissive portion 51 is not formed. It is done. In the ultraviolet curable pressure-sensitive adhesive layer 6 of the ultraviolet curable pressure-sensitive adhesive sheet 41 after the ultraviolet irradiation, the portion corresponding to the ultraviolet transmissive part 52 becomes a cured ultraviolet curable pressure-sensitive adhesive layer 62, and as a result, the ultraviolet non-transmissive part The part corresponding to 51 is not cured and is an uncured ultraviolet curable pressure-sensitive adhesive layer 61. Then, the substantially surrounding 5a of the ultraviolet non-transmission part 51 on the surface of the ultraviolet non-transmission part-containing release liner 5 (that is, the approximate boundary between the ultraviolet non-transmission part 51 and the ultraviolet transmission part 52 on the surface of the ultraviolet non-transmission part-containing release liner 5). By performing a cutting process such as a punching process along the part 5a), as shown in FIG. 4, an ultraviolet light having a predetermined shape having an uncured ultraviolet curable pressure-sensitive adhesive layer 61 by a cutting process such as a punching process. A curable adhesive sheet 42 (ultraviolet curable adhesive sheet 42 after cutting) can be obtained.

  The cutting device for cutting (for example, a punching device for punching) is not particularly limited as long as it can cut into a predetermined shape, but in general, A cutting processing device having a cutting blade such as shore, leather, or score is used.

Examples of the present invention will be described below in more detail. However, the present invention is not limited to these examples.
(Preparation example of polyacrylic acid ester)
In a reaction vessel equipped with a cooling pipe, a nitrogen introduction pipe, a thermometer, a dropping funnel, and a stirring device, 150 parts by weight of toluene as a solvent, 70 parts by weight of butyl acrylate, 30 parts by weight of 2-ethylhexyl acrylate, 3 parts by weight of acrylic acid Part, 4-hydroxybutyl acrylate 0.05 part by weight, 0.02-part by weight of 2,2-azobisisobutyronitrile in the initiator, polymerized at 60 ° C. for 3 hours in a nitrogen stream, polyacrylic ester A solution containing was obtained.

(Production example of UV curable adhesive sheet)
As an adhesive polymer component, 100 parts by weight (solid content) of the polyacrylic acid ester obtained by the preparation example of the polyacrylic acid ester, and an acrylate-based bifunctional oligomer (trade name “R-526” Nippon Kayaku as an ultraviolet curing component) 150 parts by weight (manufactured by Yakuhin), 1 part by weight of “Irgacure 184 (manufactured by Ciba Specialty Chemicals)” which is 1-hydroxycyclohexyl phenyl ketone as a photopolymerization initiator, and 30 parts by weight of ethyl acetate as a diluent solvent Then, the mixture was mixed uniformly to obtain an ultraviolet curable adhesive solution.

(Example 1)
A 30 mm × 30 mm aluminum foil (on the surface of the polyester film (thickness: 38 μm, width: 300 mm) on which the silicone release treatment agent layer is formed on one side where the silicone release treatment agent layer is not formed ( A thickness of 30 μm) is continuously formed in the length direction (longitudinal direction) at intervals of 20 mm with a mask so as to be located in the center portion in the width direction, and a release liner having an ultraviolet non-transmissive portion is manufactured. did.

  A release liner based on a polyester film (thickness: 38 μm) having a silicone release treatment agent layer formed on one side of the ultraviolet curable adhesive solution obtained by the above-described UV curable adhesive sheet production example An ultraviolet curable pressure-sensitive adhesive layer having a thickness of 50 μm is applied on the silicone-based release treatment agent layer using an applicator so that the thickness after drying is 50 μm and dried at 100 ° C. for 3 minutes. Further, on the ultraviolet curable pressure-sensitive adhesive layer, a release liner having the ultraviolet non-transmissive portion is used as a bonding-side release liner, and a silicone-based release treatment agent layer of the release liner having the ultraviolet non-transmissive portion. Are bonded so that they come into contact with the UV-curable pressure-sensitive adhesive layer, and a long UV-curable pressure-sensitive adhesive sheet is produced, wound around the core in a roll shape, and wound into a roll shape. To obtain an ultraviolet-curable pressure-sensitive adhesive sheet form.

(Comparative Example 1)
Except that a polyester film (thickness: 38 μm, width: 300 mm) having a silicone-based release treatment agent layer formed on one surface was used as the bonding-side release liner, the long side was the same as in Example 1. An ultraviolet curable pressure-sensitive adhesive sheet was produced, and further wound around the core in a roll shape to obtain an ultraviolet curable pressure-sensitive adhesive sheet wound in a roll shape.

  That is, the ultraviolet curable adhesive solution obtained by the production example of the ultraviolet curable adhesive sheet is based on a polyester film (thickness: 38 μm) having a silicone-based release treatment agent layer formed on one surface. An ultraviolet curable pressure-sensitive adhesive having a thickness of 50 μm, applied to the silicone release treatment agent layer of the release liner using an applicator so that the thickness after drying becomes 50 μm, and dried at 100 ° C. for 3 minutes. Further, a polyester film (thickness: 38 μm) having a silicone release treatment agent layer formed on one side as a bonding side release liner is formed on the ultraviolet curable pressure-sensitive adhesive layer. The release liner is bonded so that the silicone release treating agent layer of the release liner is in contact with the UV curable pressure-sensitive adhesive layer, and a long UV curable pressure-sensitive adhesive sheet is produced. , Wound by wound into a roll in the winding core, to obtain an ultraviolet-curable pressure-sensitive adhesive sheet of the form wound in a roll.

(Evaluation)
The following evaluation / measurement methods (evaluation method for protruding glue on side surfaces, evaluation method for punching workability) of the ultraviolet curable pressure-sensitive adhesive sheet wound in a roll obtained in Example 1 and Comparative Example 1 Thus, the degree of protrusion of the pressure-sensitive adhesive component on the side surface of the ultraviolet curable pressure-sensitive adhesive sheet wound in a roll shape and the punching workability were evaluated. The evaluation / measurement results are shown in the columns of “Adhesive component protrusion distance (mm)” and “Punching workability” in Table 1, respectively.

(Evaluation method for protruding side glue)
The side surface of the ultraviolet curable pressure-sensitive adhesive sheet in the form of a roll obtained in Example 1 and Comparative Example 1 was visually observed, and the ultraviolet curable pressure-sensitive adhesive sheet in the form of a roll was obtained. The degree of protrusion of the pressure-sensitive adhesive component on the side surface was evaluated by the distance (mm) of the pressure-sensitive adhesive component protruding from the side surface of the ultraviolet curable pressure-sensitive adhesive sheet.

(Punching processability evaluation method)
The UV curable pressure-sensitive adhesive sheet wound in the form of a roll obtained in Example 1 and Comparative Example 1 was rewound, and punching was performed in an area of 30 mm × 30 mm. While evaluating, the adhesion degree of the adhesive component to a processing blade was observed visually, and the punching workability was evaluated by the following evaluation criteria.

In addition, about the ultraviolet curing adhesive sheet of the form wound by the roll shape obtained in Example 1, the aluminum foil part (30 mm x 30 mm) provided in one surface of the peeling liner which has an ultraviolet non-transmission part The punching process was performed along the periphery of).
-Evaluation criteria A: Processing workability and processing accuracy are good, and no adhesive component is attached to the processing blade.
X: The adhesive component is adhering to the processing blade.

  As is clear from Table 1, the ultraviolet curable pressure-sensitive adhesive sheet obtained in Example 1 has no protrusion of the pressure-sensitive adhesive component from the side surface, and even if it is a complicated cutting process such as a punching process, the cutting processability Was confirmed to be excellent.

  In contrast, the UV curable pressure-sensitive adhesive sheet obtained in Comparative Example 1 has a pressure-sensitive adhesive component protruding from the side surface, and can no longer be used as a product.

It is a schematic plan view which shows partially the example seen from the upper surface about the peeling liner of this invention. It is the schematic which shows the one part process of the method of cutting the ultraviolet curable adhesive sheet of this invention, and is a figure which shows the state which has irradiated the ultraviolet-ray to the ultraviolet curable adhesive sheet. It is the schematic which shows the one part process of the method of cut-processing the ultraviolet curable adhesive sheet of this invention, and is a figure which shows the state which hardening has arisen in a part of ultraviolet curable adhesive layer by ultraviolet irradiation. . It is the schematic which shows a part of process of the method of cutting the ultraviolet curable adhesive sheet of this invention, and is a figure which shows the ultraviolet curable adhesive sheet of the predetermined shape cut | disconnected by the cutting process.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Long strip | belt-shaped peeling liner 2 Ultraviolet-ray-permeable plastic base material 3 Ultraviolet light non-transmissive part 4 Ultraviolet curable adhesive sheet using the ultraviolet light non-transmissive part containing release liner 41 Ultraviolet curable adhesive sheet 42 after ultraviolet irradiation 42 After cutting processing 5 UV curable pressure sensitive adhesive sheet 5 UV non-transmissive part-containing release liner 51 UV non-transmissive part 52 UV transmissive part 5a Approximate circumference of UV non-transmissive part 51 6 UV curable pressure sensitive adhesive layer 61 Uncured ultraviolet curable pressure sensitive adhesive layer 62 Cured UV curable adhesive layer 7 Normal release liner 8 UV light source

Claims (8)

A release liner comprising a plastic substrate capable of transmitting ultraviolet rays as a base material, wherein the plastic base material is partially formed with an ultraviolet non-transmitting portion. The release liner according to claim 1, wherein a plurality of ultraviolet non-transmitting portions are continuously formed in the longitudinal direction so as to have a predetermined pattern shape as a whole. The shape of one ultraviolet non-transmitting portion corresponds to the shape when an ultraviolet curable adhesive sheet having an ultraviolet curable adhesive layer protected by a release liner is cut into a predetermined shape. The described release liner. The ultraviolet non-transmission part is formed of at least one ultraviolet non-transparent layer selected from a metal layer, an ink layer, an ultraviolet absorber layer, and a non-metallic inorganic layer. The release liner according to item. An ultraviolet curable adhesive sheet having an ultraviolet curable adhesive layer, wherein the release liner according to any one of claims 1 to 4 is laminated on at least one surface of the ultraviolet curable adhesive layer. An ultraviolet curable pressure-sensitive adhesive sheet characterized by comprising: 6. The ultraviolet curable pressure-sensitive adhesive sheet according to claim 5, wherein the ultraviolet curable pressure-sensitive adhesive layer at a portion corresponding to the ultraviolet transmissive portion where the ultraviolet non-transmissive portion is not formed is cured by ultraviolet irradiation from the release liner side. The ultraviolet ray curable pressure-sensitive adhesive layer corresponding to the ultraviolet ray transmitting portion is cured, and then cut along a substantially boundary line between the ultraviolet ray non-transmitting portion and the ultraviolet ray transmitting portion of the release liner. UV curable adhesive sheet. A method for cutting an ultraviolet curable pressure-sensitive adhesive sheet into a predetermined shape, wherein the ultraviolet curable pressure-sensitive adhesive layer and the release liner according to any one of claims 1 to 4 are laminated on a laminate. After irradiating ultraviolet rays from the liner side and curing the UV curable pressure-sensitive adhesive layer corresponding to the UV transmitting portion where no UV non-transmitting portion is formed, the UV non-transmitting portion and the UV transmitting portion of the release liner A method of cutting an ultraviolet curable pressure-sensitive adhesive sheet, comprising cutting along a substantially boundary portion of the ultraviolet curable adhesive sheet.

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