WO2023080065A1

WO2023080065A1 - Method for manufacturing laminate film having adhesive layer

Info

Publication number: WO2023080065A1
Application number: PCT/JP2022/040316
Authority: WO
Inventors: 清貴堤; そら道下; 真也山本
Original assignee: 日東電工株式会社
Priority date: 2021-11-08
Filing date: 2022-10-28
Publication date: 2023-05-11
Also published as: TW202333960A

Abstract

A method for manufacturing a laminate film comprises: a step (S2) for performing laser processing from a film layer (30) side on a work film (W) having a carrier film (C), a film layer (10), a raw adhesive layer (20), and the film layer (30) in this order in the thickness direction (H), so as to cut the raw adhesive layer (20) and the film layer (30) on the film layer (10), forming, on the raw adhesive layer (20), an adhesive layer (21) and a surrounding portion (22) surrounding the adhesive layer, and forming, on the film layer (30), a film (31) on the adhesive layer (21) and a surrounding portion (32) surrounding the film; a step (S3) for removing the surrounding portions (22, 32) and the film (31); a step (S4) for bonding, as a film layer (40), an elongated film (40') on the adhesive layer (20) side of the work film (W); and a step (S5) for performing press processing to cut the film layers (10, 40) on a carrier film (S) and form films (11, 41).

Description

Method for producing laminated film having pressure-sensitive adhesive layer

The present invention relates to a method for producing a laminated film having an adhesive layer.

A display panel has a laminated structure including elements such as a pixel panel, a polarizing film, a touch panel and a cover film. In the manufacturing process of such a display panel, for example, an optically transparent adhesive sheet (optical adhesive sheet) is used for bonding the elements included in the laminated structure. An optical pressure-sensitive adhesive sheet is produced in a form in which both sides of the sheet are coated with release liners (in the form of a laminated film having an adhesive layer).

On the other hand, the development of display panels that can be repeatedly folded (foldable) for smartphones and tablet terminals, for example, is progressing. Specifically, the foldable display panel is repeatedly deformable between a bent shape and a flat non-bent shape. In such a foldable display panel, each element in the laminated structure is manufactured to be repeatedly foldable, and a thin optical adhesive sheet is used for bonding between such elements. An optical pressure-sensitive adhesive sheet for flexible devices such as foldable display panels is described, for example, in Patent Document 1 below.

JP 2018-111754 A

An optical adhesive sheet for display panels is conventionally manufactured, for example, as follows.

First, as shown in FIG. 11A, a laminated sheet 90 is prepared as a long original sheet. The laminate sheet 90 has a release liner 91, an adhesive layer 92, and a release liner 93 in the thickness direction H in this order. The release liner 91 is in contact with one side of the adhesive layer 92 so as to be releasable. The release liner 93 is in contact with the other surface of the adhesive layer 92 so as to be releasable. Such a laminated sheet 90 is passed through a production line while being supported on a carrier film (not shown).

Next, as shown in FIG. 11B, a plurality of sheet-shaped optical adhesive sheets 92A are formed by pressing the adhesive layer 92 of the laminated sheet 90 (pressing step). In the press working, as shown in FIG. 12, a blade 101 of a cutting die 100 is pushed into the laminate sheet 90 from the release liner 93 side to the release liner 91 . As a result, an optical adhesive sheet 92A having a predetermined plan view shape is formed. In this step, a peripheral portion 92a is formed around the optical adhesive sheet 92A in the adhesive layer 92. As shown in FIG. The release liner 93 is also pressed to form a release liner 93A having the same plan view shape as the adhesive layer 92, and a peripheral portion 93a is produced around the release liner 93A. In this step, as shown in FIG. 13, cut grooves 95 are formed in the laminated sheet 90 . The cutting grooves 95 are formed by pressing the adhesive layer 92 and the release liner 93 in the plane direction D with a blade 101 (FIG. 12) that pushes into the adhesive layer 92 and the release liner 93 . Edges E, E of adjacent optical adhesive sheet 92A and peripheral portion 92a on release liner 91 face each other. In the press working of this step, the blade 101 of the cutting die 100 is pushed into the laminated sheet 90 from the release liner 93 side to the carrier film, thereby forming a predetermined plan view shape on the carrier film. An optical adhesive sheet 92A with a release liner may be formed. In this case, the cutting step, which will be described later with reference to FIG. 11D, is not performed.

Fig. 14 shows an example of a conventional press working process. In the pressing process shown in FIG. 14, the laminated sheet 90 flowing through the production line passes through a pair of

nip rollers

201, 201, a press machine 202, and a pair of

nip rollers

203, 203 in this order. The press machine 202 includes an intermittent feeder, a working stage, and a cutting die arranged above the stage (all not shown). Between the pair of

nip rollers

201 and 201 and the press machine 202, the laminated sheet 90 is slackened. Between the press machine 202 and the pair of

nip rollers

203, 203, the laminated sheet 90 is slackened. Between the

nip rollers

201 , 201 and the

nip rollers

203 , 203 , the laminated sheet 90 is intermittently fed by the intermittent feeding device of the press machine 202 . As a result, the unprocessed area of the laminated sheet 90 is intermittently supplied onto the processing stage of the press machine 202 . On the processing stage, each unprocessed region of the intermittently supplied laminated sheet 90 is pressed by a blade.

After such a pressing step, as shown in FIG. 11C, the

peripheral portions

92a and 93a are removed from the release liner 91 (removing step). Thereafter, as shown in FIG. 11D, the long release liner 91 is cut into individual release liners 91A. As a result, a sheet-like laminate film (release liner 91A/optical adhesive sheet 92A/release liner 93A) having an adhesive layer is obtained.

Optical adhesive sheets for flexible devices are required to be highly flexible so as to have sufficient conformability to the adherend when the device is bent and excellent stress relaxation properties. However, in the conventional manufacturing method described above, the softer the adhesive layer 92, the more the edge portions E, E of the optical adhesive sheet 92A and the peripheral portion 92a adjacent to each other on the release liner 91 after the pressing step (FIG. 11B). However, as indicated by the dashed line in FIG. 13, they tend to be deformed so as to bulge outward. Specifically, the edge portions E, E, which are separated by the pushing of the blade 101 during press working, are likely to be deformed so as to return to their original positions (restorative deformation).

In addition, in the conventional manufacturing method, when the laminated sheet 90 passed through the press machine 202 is sandwiched between the pair of nip rollers 203, 203 (FIG. 14), pressure is applied to the laminated sheet 90 in the thickness direction H. , edge portions E, E (FIG. 13) are likely to be deformed so as to bulge outward.

Such deformation of the edge E causes the adjacent edges E, E to contact and adhere to each other (first blocking). If blocking occurs between the edges E, E, the

peripheral portions

92a, 93a cannot be properly removed in the removal step (FIG. 11C). Blocking between the edges E, E lowers the manufacturing yield of the laminate film having the pressure-sensitive adhesive layer.

The present invention provides a method for producing a laminated film suitable for efficiently producing a laminated film having a soft adhesive layer.

The present invention [1] is a roll-to-roll manufacturing method for a laminated film having an adhesive layer, wherein a carrier film, a first film layer, an original adhesive layer, and a second film layer are By irradiating a long work film provided in this order in the direction with a laser beam in the thickness direction from the second film layer side, the original adhesive layer and the second Cut the film layer, form the individualized adhesive layer and the first peripheral part around the adhesive layer in the original adhesive layer, and form the adhesive layer on the adhesive layer in the second film layer a first contouring step of forming a second film and a second perimeter on the first perimeter around the second film; from the work film to the second perimeter and the first perimeter And a removing step of removing the second film, a laminating step of laminating a long film as a third film layer on the adhesive layer side of the work film after the removing step, and after the laminating step, By pressing the press blade against the work film from the third film layer side, the first film layer and the third film layer are cut on the carrier film, and the first film layer is cut on the first film layer. and a second contouring step of forming a third film on the third film layer.

The method for manufacturing a laminated film having an adhesive layer includes the first contour processing step, as described above. In the first shape processing step, the original pressure-sensitive adhesive layer on the first film layer is cut by irradiation with a laser beam, and individualized pressure-sensitive adhesive layers are formed in the same layer. That is, the adhesive layer of the laminate film having the adhesive layer is shaped by laser processing. The laser processing is suitable for continuously contouring the pressure-sensitive adhesive layer while continuously flowing the work film (there is no need to intermittently send the work film for contour processing of the pressure-sensitive adhesive layer). Therefore, this production method is suitable for efficiently producing a laminated film having an adhesive layer.

In the first shape processing step, the material of the original adhesive layer is evaporated and removed in the portion where the original adhesive layer is irradiated with the laser beam. That is, in the first shape processing step, the original adhesive layer is partially removed, so that the adhesive layer and the first peripheral portion around it are separated from each other in the original adhesive layer. Since the original pressure-sensitive adhesive layer is not cut into the pressure-sensitive adhesive layer and the first peripheral portion by the pressing of the press blade, the above-described restoring deformation of the pressure-sensitive adhesive layer and the first peripheral portion does not occur. Such a first contouring step prevents the above-described first blocking between the adhesive layer and the first peripheral portion even when the adhesive layer is soft and therefore easily deformed. Suitable for suppression.

In the second outer shape processing step of this manufacturing method, as described above, the first and third film layers on the carrier film are cut by pressing the press blade against the work film from the third film layer side. . Such a press process can shape the first and third films without further shaping the pressure-sensitive adhesive layer in a state in which the pressure-sensitive adhesive layer that has already been shaped has been placed between the first and third film layers. suitable for processing. In the second contouring step, when the third film is contoured without contouring the pressure-sensitive adhesive layer, the portion to be cut in the third film layer is not sufficiently supported by the pressure-sensitive adhesive layer, so the thickness The position of the direction is easy to change. Therefore, if laser processing is performed instead of press processing in the second contour processing step, it is difficult to focus the laser beam on the third film layer. Therefore, laser processing cannot properly cut the third film layer. On the other hand, in the second outer shape processing step of the present manufacturing method, the third film layer can be appropriately cut by pressing it with a press blade.

As described above, the present production method efficiently produces a laminated film having a soft adhesive layer (having a first film, an adhesive layer, and a third film in this order in the thickness direction). Suitable for

According to the present invention [2], the cut portions of the first film layer and the third film layer in the second shaping step are separated from the pressure-sensitive adhesive layer in a plane direction orthogonal to the thickness direction. The method for producing a laminated film having an adhesive layer according to [1] is included.

The first and third films formed by such a second trimming step have extended ends that extend outward beyond the edges of the pressure-sensitive adhesive layer. A laminated film comprising such first and third films is suitable for suppressing the pressure-sensitive adhesive layer from protruding from the film edge. The protrusion of the pressure-sensitive adhesive layer is not preferable because it causes the ends of the pressure-sensitive adhesive layers of adjacent laminated films to adhere to each other (second blocking) when the laminated films are stacked.

The present invention [3] further includes a nipping step of pinching and pulling the work film between a pair of rollers after the first outer shape processing step and before the removing step [1] or [2]. Including the method for producing a laminated film having the pressure-sensitive adhesive layer according to .

Such a nipping process is preferable for appropriately applying tension to the work film in the first trimming process. In addition, this manufacturing method is suitable for suppressing the above-described first blocking between the pressure-sensitive adhesive layer and the first peripheral portion in such a nipping step.

The present invention [4] is any one of [1] to [3] above, wherein the first contouring step does not include loosening the work film before irradiating the work film with the laser light. The method for producing a laminated film having a pressure-sensitive adhesive layer according to 1.

Such a manufacturing method does not require adjustment and control for loosening the work film before laser processing on the manufacturing line, and is preferable for efficiently manufacturing a laminated film having an adhesive layer.

The present invention [5] is any one of [1] to [4] above, wherein the first contouring step does not include loosening the work film after the work film is irradiated with the laser light. Including the method for producing a laminated film having the pressure-sensitive adhesive layer according to .

Such a manufacturing method does not require adjustment and control for loosening the work film after laser processing in the manufacturing line, and is preferable for efficiently manufacturing laminated films having adhesive layers. In addition, the fact that the first contouring step does not involve loosening the work film after laser light irradiation is suitable for avoiding the work film bending with a relatively large radius of curvature in the production line. Suitable for suppressing the above-described first blocking between the first peripheral portion (the curvature of the work film shortens the separation distance between the adhesive layer and the first peripheral portion, block).

1 is a flow chart of a method for producing a laminated film having an adhesive layer of the present invention. 1. It is a schematic diagram of the manufacturing line which enforces the manufacturing method shown in FIG. 2 represents some steps in the manufacturing method shown in FIG. 3A shows the step of preparing the laminated sheet (preparing step), FIG. 3B shows the step of supporting the laminated sheet with a carrier film, and FIG. 3C shows the first contour processing step (laser processing). FIG. 3D represents a step following the step of FIG. 3C. 4A represents the first sub-step of the removal process, FIG. 4B represents the second sub-step of the removal process, and FIG. 4C represents the third sub-step of the removal process. FIG. 4C represents a step following the step of FIG. 4C. 5A represents the fourth sub-step of the removal process, FIG. 5B represents the fifth sub-step of the removal process, and FIG. 5C represents the lamination process. FIG. 5C represents a step following the step of FIG. 5C. FIG. 6A is a cross-sectional view in the flow direction showing the second contouring process (pressing), FIG. 6B is a cross-sectional view in the width direction showing the second contouring process, and FIG. FIG. 4 is a cross-sectional view of the work film after each perimeter of the three-film layer has been removed; FIG. 3C is a plan view of an example of a region of the work film after the first contouring step (FIG. 3C); FIG. 5C is a plan view of an example of a region of the work film after the bonding step (FIG. 5C); FIG. 6B is a plan view of an example of a region of the work film after the second contouring step (FIGS. 6A and 6B); A modification of the first contouring process is represented. In this modification, the work film is loosened before and after the laser processing in the first contour processing step. An example of a method for manufacturing a laminated film having a conventional pressure-sensitive adhesive layer is shown. 11A represents a step of preparing a laminated sheet, FIG. 11B represents a pressing step, FIG. 11C represents a removing step, and FIG. 11D represents a cutting step. It represents the press working process using a blade. It is a partially enlarged cross-sectional schematic diagram of a cut portion after the press working process. An example of a conventional press working process is shown.

A method for manufacturing a laminated film according to one embodiment of the present invention is a roll-to-roll method for manufacturing a sheet-shaped laminated film having an adhesive layer. This manufacturing method includes, as shown in FIG. 1, a preparation step S1, a first contour processing step S2, a removal step S3, a bonding step S4, and a second contour processing step S5. FIG. 2 is a schematic diagram of a production line for carrying out the production method shown in FIG.

In the preparation step S1, as shown in FIG. 3A, a laminated film X as a long original film is prepared. The laminated film X includes a film layer 10 (first film layer), an original pressure-sensitive adhesive layer 20, and a film layer 30 (second film layer) in the thickness direction H in this order. The original adhesive layer 20 has a first surface 20a and a second surface 20b opposite to the first surface 20a. The film layer 10 is in contact with the first surface 20a. The film layer 30 is in contact with the second surface 20b. The laminated film X spreads in a plane direction orthogonal to the thickness direction H.

The film layer 10 is, for example, a release liner, a functional optical film, or a base film (support film).

Materials for the release liner include, for example, polyester, polyolefin, and polycarbonate. Polyesters include, for example, polyethylene terephthalate, polyethylene naphthalate, and polybutylene terephthalate. Polyolefins include, for example, polyethylene, polypropylene, and cycloolefin polymers (COP). The film layer 10 as a release liner is in releasable contact with the first surface 20a of the original pressure-sensitive adhesive layer 20 . The surface of such a film layer 10 (the surface on the original pressure-sensitive adhesive layer 20 side) is preferably subjected to release treatment. Release treatments include, for example, silicone release treatments and fluorine release treatments. The thickness of the release liner is preferably 10 µm or more, more preferably 20 µm or more, and even more preferably 30 µm or more, from the viewpoint of ensuring a protective function for the pressure-sensitive adhesive layer. From the viewpoint of thinning the laminated film X, the thickness of the release liner is preferably 200 μm or less, more preferably 150 μm or less, and even more preferably 100 μm or less.

Examples of functional optical films include polarizing films and retardation films. The functional optical film may be other optical films such as panel stiffeners. When the film layer 10 is a functional optical film, the first surface 20a of the original pressure-sensitive adhesive layer 20 is bonded to such a film layer 10 . The film layer 10 as a functional optical film and the original adhesive layer 20 form a functional optical film with an adhesive layer.

Examples of polarizing films include hydrophilic polymer films that have undergone dyeing treatment with a dichroic substance and subsequent stretching treatment. Dichroic substances include, for example, iodine and dichroic dyes. Hydrophilic polymer films include, for example, polyvinyl alcohol (PVA) films, partially formalized PVA films, and partially saponified ethylene-vinyl acetate copolymer films. Polarizing films also include oriented polyene films. Materials for the oriented polyene film include, for example, dehydrated PVA and dehydrochlorinated polyvinyl chloride. The polarizing film may have a protective film bonded via an adhesive on one side and/or the other side in the thickness direction. The thickness of the polarizing film is preferably 10 μm or more, more preferably 20 μm or more, from the viewpoint of ensuring the function, strength and durability of the polarizing film. From the viewpoint of thinning the laminated film X, the thickness of the polarizing film is preferably 500 μm or less, more preferably 300 μm or less.

Examples of retardation films include λ/2 wavelength films, λ/4 wavelength films, and viewing angle compensation films. Materials for the retardation film include, for example, polymer films birefringent by stretching. Polymeric films include, for example, cellulose films and polyester films. Cellulose films include, for example, triacetyl cellulose films. Polyester films include, for example, polyethylene terephthalate film, polyethylene naphthalate film, and polybutylene terephthalate film. The retardation film also includes a film comprising a substrate such as a cellulose film and an alignment layer of a liquid crystal compound such as a liquid crystalline polymer on the substrate. From the viewpoint of ensuring the function and strength of the retardation film, the thickness of the retardation film is preferably 1 μm or more, more preferably 2 μm or more. From the viewpoint of thinning the laminated film X, the thickness of the retardation film is preferably 100 μm or less, more preferably 80 μm or less.

Materials for the base film include, for example, the materials described above as materials for the release liner. When the film layer 10 is a base film, the first surface 20a of the original pressure-sensitive adhesive layer 20 is bonded to such a film layer 10 . The film layer 10 as the base film and the original adhesive layer 20 form a single-sided adhesive sheet. The thickness of the substrate film is preferably 10 μm or more, more preferably 20 μm or more, and even more preferably 30 μm or more, from the viewpoint of ensuring strength as a substrate. The thickness of the base film is preferably 200 μm or less, more preferably 150 μm or less, and even more preferably 100 μm or less, from the viewpoint of thinning the laminated film X.

The original adhesive layer 20 is formed from an adhesive composition. The adhesive composition contains a base polymer. The base polymer is an adhesive component that develops adhesiveness. Base polymers include, for example, acrylic polymers, polyurethane polymers, polyamide polymers, and polyvinyl ether polymers. The base polymer may be used alone or in combination of two or more. From the viewpoint of ensuring good transparency and adhesiveness in the original pressure-sensitive adhesive layer 20, an acrylic polymer is preferably used as the base polymer.

An acrylic polymer is a copolymer of monomer components containing 50% by mass or more of (meth)acrylic acid ester. "(Meth)acrylic" means acrylic and/or methacrylic. As the (meth)acrylic acid ester, an alkyl (meth)acrylic acid ester is preferably used, and an alkyl (meth)acrylic acid ester having an alkyl group having 1 to 20 carbon atoms is more preferably used. Examples of (meth)acrylic acid alkyl esters include methyl (meth)acrylate, ethyl (meth)acrylate, n-butyl (meth)acrylate, pentyl (meth)acrylate, and n-hexyl (meth)acrylate. , Heptyl (meth)acrylate, 2-ethylhexyl (meth)acrylate, n-octyl (meth)acrylate, isooctyl (meth)acrylate, nonyl (meth)acrylate, isononyl (meth)acrylate, (meth) Examples include decyl acrylate, isodecyl (meth)acrylate, undecyl (meth)acrylate, and dodecyl (meth)acrylate.

The monomer component may contain a copolymerizable monomer that can be copolymerized with the (meth)acrylic acid alkyl ester. Examples of copolymerizable monomers include monomers having a polar group. Polar group-containing monomers include, for example, hydroxyl group-containing monomers, nitrogen atom-containing ring-containing monomers, and carboxy group-containing monomers. The polar group-containing monomer is useful for modifying the acrylic polymer, such as introducing cross-linking points into the acrylic polymer and securing the cohesive strength of the acrylic polymer. Hydroxy group-containing monomers include, for example, 2-hydroxyethyl (meth)acrylate, 2-hydroxypropyl (meth)acrylate, and 2-hydroxybutyl (meth)acrylate. Examples of monomers having a nitrogen atom-containing ring include N-vinyl-2-pyrrolidone, N-methylvinylpyrrolidone, N-vinylpyridine, N-vinylpiperidone, N-vinylimidazole, and N-(meth)acryloyl-2- pyrrolidone.

The base polymer preferably has a crosslinked structure. As a method of introducing a crosslinked structure into the base polymer, the base polymer having a functional group capable of reacting with the crosslinker and the crosslinker are blended into the adhesive composition, and the base polymer and the crosslinker are reacted in the adhesive layer. A method (first method), and a polyfunctional monomer as a cross-linking agent is included in the monomer component forming the base polymer, and a branched structure (cross-linked structure) is introduced into the polymer chain by polymerization of the monomer component. A method of forming the base polymer (second method) is included. These methods may be used in combination.

Examples of the cross-linking agent used in the first method include compounds that react with functional groups (hydroxy groups, carboxy groups, etc.) contained in the base polymer. Such crosslinkers include, for example, isocyanate crosslinkers, peroxide crosslinkers, and epoxy crosslinkers. The cross-linking agents may be used alone, or two or more of them may be used in combination.

In the second method, first, a monofunctional monomer for forming the base polymer is polymerized (prepolymerization), thereby containing a partially polymerized product (a mixture of a polymer with a low degree of polymerization and an unreacted monomer). A prepolymer composition is prepared. Next, after adding a polyfunctional monomer as a cross-linking agent to the prepolymer composition, the partially polymerized product and the polyfunctional monomer are polymerized (main polymerization). Examples of polyfunctional monomers include polyfunctional (meth)acrylates containing two or more ethylenically unsaturated double bonds per molecule. Examples of polyfunctional (meth)acrylates include ethylene glycol di(meth)acrylate, diethylene glycol di(meth)acrylate, 1,6-hexanediol di(meth)acrylate, trimethylolpropane tri(meth)acrylate, pentaerythritol tri (meth)acrylates and dipentaerythritol hexa(meth)acrylates.

The base polymer can be formed by polymerizing the above monomer components. Polymerization methods include, for example, solution polymerization, solventless photopolymerization (eg, UV polymerization), bulk polymerization, and emulsion polymerization. Ethyl acetate and toluene, for example, are used as solvents for solution polymerization. As the polymerization initiator, for example, a thermal polymerization initiator or a photopolymerization initiator is used.

The weight-average molecular weight of the base polymer is preferably 100,000 or more, more preferably 300,000 or more, and even more preferably 500,000 or more, from the viewpoint of securing the cohesive force in the original pressure-sensitive adhesive layer 20 . The weight-average molecular weight is preferably 5 million or less, more preferably 3 million or less, still more preferably 2 million or less. The weight average molecular weight of the base polymer is measured by gel permeation chromatography (GPC) and calculated by polystyrene conversion.

From the viewpoint of ensuring the softness of the original adhesive layer 20, the glass transition temperature (Tg) of the base polymer is preferably 0°C or lower, more preferably -10°C or lower, and even more preferably -20°C or lower. The glass transition temperature is, for example, −80° C. or higher.

For the glass transition temperature (Tg) of the base polymer, the glass transition temperature (theoretical value) obtained based on the following Fox formula can be used. The Fox equation is a relational expression between the glass transition temperature Tg of a polymer and the glass transition temperature Tgi of a homopolymer of monomers constituting the polymer. In the Fox formula below, Tg represents the glass transition temperature (° C.) of the polymer, Wi represents the weight fraction of the monomer i constituting the polymer, and Tgi represents the glass transition of the homopolymer formed from the monomer i. Indicates temperature (°C). Literature values can be used for the glass transition temperature of homopolymers. For example, the "Polymer Handbook" (4th edition, John Wiley & Sons, Inc., 1999) lists the glass transition temperatures of various homopolymers. On the other hand, the glass transition temperature of a homopolymer of a monomer can also be determined by the method specifically described in JP-A-2007-51271.

Fox's formula 1/(273+Tg)=Σ[Wi/(273+Tgi)]

The adhesive composition may contain other components as necessary. Other ingredients include, for example, solvents, silane coupling agents, UV absorbers, tackifiers, softeners, and antioxidants. The solvent includes, for example, a polymerization solvent that is optionally used during polymerization of the acrylic polymer, and a solvent that is added to the polymerization reaction solution after polymerization. For example, ethyl acetate and toluene are used as the solvent.

The haze of the original pressure-sensitive adhesive layer 20 is preferably 3% or less, more preferably 2% or less, and even more preferably 1% or less. The haze of the original pressure-sensitive adhesive layer 20 can be measured using a haze meter according to JIS K7136 (2000). Examples of the haze meter include "NDH2000" manufactured by Nippon Denshoku Industries Co., Ltd. and "HM-150 type" manufactured by Murakami Color Research Laboratory.

The shear storage modulus of the original pressure-sensitive adhesive layer 20 at 25° C. is preferably 10 kPa or more, more preferably 15 kPa or more, still more preferably 20 kPa or more, and particularly preferably 25 kPa or more. The shear storage modulus of the original pressure-sensitive adhesive layer 20 at 25° C. is preferably 1000 kPa or less, more preferably 700 kPa, from the viewpoint of realizing the softness required for the optical pressure-sensitive adhesive sheet for use in flexible display panels in the raw pressure-sensitive adhesive layer 20. Below, more preferably 500 kPa or less, particularly preferably 300 kPa or less. Methods for adjusting the shear storage modulus include, for example, selection of the type of base polymer in the original pressure-sensitive adhesive layer 20, adjustment of the molecular weight, adjustment of the blending amount, adjustment of the glass transition temperature, and adjustment of the degree of cross-linking. Methods for adjusting the shear storage elastic modulus include selection of components other than the base polymer in the original pressure-sensitive adhesive layer 20 and adjustment of the compounding amount. The shear storage modulus of the pressure-sensitive adhesive layer is determined by dynamic viscoelasticity measurement. The same measurement can be performed with a dynamic viscoelasticity measuring device "Advanced Rheometric Expansion System (ARES)" manufactured by Rheometric Scientific. In the same measurement, the measurement mode is the shear mode, the measurement temperature range is -40°C to 100°C, the temperature increase rate is 5°C/min, and the frequency is 1Hz.

The film layer 30 is a release liner in this embodiment. Release liner materials include, for example, polyesters, polyolefins, and polycarbonates. Specifically, the release liner materials described above with respect to film layer 10 may be mentioned. A film layer 30 as a release liner is in releasable contact with the second surface 20b of the original pressure-sensitive adhesive layer 20 . The surface of such a film layer 30 (the surface on the original pressure-sensitive adhesive layer 20 side) is preferably subjected to release treatment. Release treatments include, for example, silicone release treatments and fluorine release treatments. The thickness of the film layer 30 is, for example, 10 μm or more and, for example, 200 μm or less.

The laminated film X can be produced, for example, as follows. First, the adhesive composition described above is applied onto the film layer 10 to form a coating film. Next, the film layer 30 is laminated on the coating film on the film layer 10 . Next, the coating between the film layers 10 and 30 is dried and, if necessary, the coating is irradiated with light. As a result, the original pressure-sensitive adhesive layer 20 is formed between the film layers 10 and 30 . Examples of methods for applying the adhesive composition include roll coating, kiss roll coating, gravure coating, reverse coating, roll brushing, spray coating, dip roll coating, bar coating, knife coating, air knife coating, curtain coating, and lip coating. , and die coats. The drying temperature of the coating film is, for example, 50°C to 200°C. The drying time is, for example, 5 seconds to 20 minutes.

The laminated film X as described above is supplied to the production line shown in FIG. In this embodiment, the production line includes a delivery roller (not shown), a pair of nip

rollers

61, 61, a laser processing machine 70, a pair of nip

rollers

62, 62, a peeling roller 63, and a pair of bonding rollers 64. , 64, a peeling roller 65, a pair of

bonding rollers

66, 66, a peeling roller 67, a pair of

bonding rollers

68, 68, a press machine 80, a pair of nip

rollers

69, 69, and further A peeling roller (not shown) and a first winding roller (not shown) as a terminal winding roller are provided in this order. A roll of the laminated film X is set on the feeding roller. The laminated film X is unwound from this roll.

The laminated film X delivered from the delivery rollers is bonded to the carrier film C on the upstream side of the pair of nip

rollers

61, 61, as shown in FIG. 3B. Thereby, the work film W is formed. The carrier film C is a single-sided adhesive film having an adhesive surface on one side in the thickness direction H. In the work film W, the adhesive surface of the carrier film C is attached to the laminated film X on the film layer 10 side. Specifically, the work film W includes a carrier film C, a film layer 10, an original pressure-sensitive adhesive layer 20, and a film layer 30 in the thickness direction H in this order. Further, the carrier film C is wider than the laminated film X in the width direction D2 (FIG. 7) orthogonal to the flow direction D1 of the work film W in this embodiment. The laminated film X is arranged on the carrier film C at the center position in the width direction D2. Such a work film W is passed through the production line. That is, the laminated film X is flowed through the production line while being supported on the carrier film C. As shown in FIG.

Before the first outer shape processing step S2, the laminated film X is nipped by a pair of nip

rollers

61, 61 as shown in FIG. Specifically, each nip roller 61 is rotated at a constant speed while the work film W is sandwiched between the pair of nip

rollers

61 , 61 to pull the work film W and feed it toward the laser processing machine 70 . As a result, an appropriate tension can be applied to the work film W on the line upstream side of the nip

rollers

61 , 61 . Appropriate tension is applied to the work film W on the upstream side of the line from the nip

rollers

61, 61 to bond the carrier film C and the cover film for preventing adhesion of fumes in the upstream region of the line. (implemented as necessary) can be appropriately implemented without causing problems such as wrinkles.

In the first contour processing step S2, as shown in FIG. 3C, the adhesive layer 21 is formed on the original adhesive layer 20 by laser processing the work film W with the laser processing machine 70 (FIG. 2). Specifically, it is as follows.

The work film W is irradiated with a laser (laser light) from the film layer 30 side in the thickness direction H along the planned cutting line of the work film W. Thereby, the original adhesive layer 20 and the film layer 30 on the film layer 10 are cut. By this cutting, the individualized adhesive layer 21 and the peripheral portion 22 (first peripheral portion) around the adhesive layer 21 are formed in the original adhesive layer 20 . In the film layer 30, a film 31 (second film) on the adhesive layer 21 and a peripheral portion 32 (second peripheral portion) around the film 31 are formed. Perimeter 32 is on perimeter 31 . A half-cut groove 10 a is formed in the film layer 10 . Half-cut grooves 10 a are formed along edges 21 a of adhesive layer 21 . FIG. 7 is a plan view showing an example of a region of the work film W after the first outer shape processing step S2.

Lasers for laser processing include, for example, gas lasers, solid-state lasers, and semiconductor lasers. Gas lasers include, for example, excimer lasers and CO ₂ lasers (10.6 μm) (numbers in parentheses represent laser wavelengths; the same applies hereinafter for lasers). Excimer lasers include, for example, _F2 excimer laser (157 nm), ArF excimer laser (193 nm), KrF excimer laser (248 nm), and XeCl excimer laser (308 nm). Examples of solid-state lasers include Nd:YAG laser (1064 nm), second harmonic of Nd:YAG laser (532 nm), third harmonic of Nd:YAG laser (355 nm), and fourth harmonic of Nd:YAG laser. waves (266 nm). As a semiconductor laser, for example, a semiconductor laser with a wavelength of 405 nm can be used. In laser processing, the pulse width of the irradiation laser is, for example, 0.5 to 50 μs, the pulse frequency is, for example, 1 to 200 kHz, the laser output is, for example, 2 to 250 W, and the laser beam spot diameter is, for example, 50 to 50. 200 μm.

After the first contouring step S2, the work film W is nipped by a pair of nip

rollers

62, 62 as shown in FIG. Specifically, each nip roller 62 is rotated at a constant speed with the work film W sandwiched between the pair of nip

rollers

62, 62, and the work film W is pulled and sent downstream. Appropriate tension can be applied to the work film W between the nip

rollers

61,61 and the nip

rollers

62,62. The manufacturing method of this embodiment further includes such a nipping step after the first trimming step S2 and before the next removing step S3. As will be described later in detail, this manufacturing method is suitable for suppressing the above-described first blocking between the adhesive layer 21 and the peripheral portion 22 in the nipping step. In addition, the fact that a suitable tension can be applied to the work film W between the nip

rollers

61, 61 and the nip

rollers

62, 62 suppresses wrinkles, warping, etc. of the work film W to be subjected to laser processing. It helps to make the focal length of laser processing constant, and therefore helps to suppress variations in processing quality of laser processing.

For the work film W that has passed between the nip

rollers

62, 62, as shown in FIG.

In the removing step S3, first, as shown in FIGS. 2 and 4A, the peripheral portion 32 is removed from the work film W by the peeling roller 63 (first substep). The stripping roller 63 has a roller surface 63a. The roller surface 63a has adhesiveness, for example. While the peeling roller 63 rotates in a certain direction, the roller surface 63a contacts the film layer 30 side of the work film W, so that the peripheral portion 32 of the film layer 30 adheres to the roller surface 63a. It is separated from the peripheral portion 22 of the original adhesive layer 20 . The peripheral portion 32 is then wound up by a predetermined second winding roller (not shown). That is, the peripheral portion 32 is peeled off from the roller surface 63a.

In the removing step S3, next, as shown in FIGS. 2 and 4B, a pair of

bonding rollers

64, 64 bond the transfer film F to the work film W (second substep). The transfer film F is, for example, a flexible plastic film. As the plastic film, for example, polyethylene terephthalate (PET) film is used. Specifically, in this step, by passing the work film W and the transfer film F between the

bonding rollers

64, 64, the film 31 side (the side opposite to the carrier film C) of the work film W is The transfer film F is pressed. As a result, the peripheral portion 22 of the original pressure-sensitive adhesive layer 20 is adhered to the transfer film F. As shown in FIG. The film 31 is not adhered to the transfer film F.

In the removing step S3, as shown in FIGS. 2 and 4C, the transfer film F is peeled off from the work film W by the peeling roller 65 (third substep). The stripping roller 65 has a roller surface 65a in this embodiment. The roller surface 65a has adhesiveness, for example. The transfer film F is separated from the work film W by the roller surface 65a adhering to one surface of the transfer film F in the thickness direction H while the peel roller 65 rotates in a fixed direction. At this time, the peripheral portion 22 (part of the original pressure-sensitive adhesive layer 20 ) attached to the other side of the transfer film F in the thickness direction H is separated from the film layer 10 . The transfer film F with the peripheral portion 22 is then wound up by a predetermined third winding roller (not shown). That is, the transfer film F is peeled off from the roller surface 65a.

In the removing step S3, next, as shown in FIGS. 2 and 5A, the peeling tape T is bonded to the work film W by a pair of bonding rollers 66, 66 (fourth substep). The release tape T is a single-sided adhesive tape having an adhesive surface Ta. Specifically, in this step, the adhesive surface Ta of the release tape T is attached to the film 31 of the work film W by passing the work film W and the release tape T between the

bonding rollers

66 , 66 .

In the removing step S3, as shown in FIGS. 2 and 5B, the peeling roller 67 peels off the peeling tape T from the work film W (fifth substep). The stripping roller 67 has a roller surface 67a in this embodiment. The roller surface 67a has adhesiveness, for example. The peeling tape T is peeled off from the work film W by the roller surface 67a adhering to one surface of the peeling tape T in the thickness direction H while the peeling roller 67 rotates in a fixed direction. At this time, the film 31 to which the adhesive surface Ta of the release tape T is attached is separated from the adhesive layer 21 . The peeling tape T with the film 31 is then wound up by a predetermined fourth winding roller (not shown). That is, the peeling tape T is peeled off from the roller surface 67a.

Next, in the laminating step S4, as shown in FIGS. 2 and 5C, a pair of

laminating rollers

68, 68 are used to place the long film 40' on the adhesive layer 21 side of the work film W. 3rd film layer).

The film layer 40 is a release liner in this embodiment. Release liner materials include, for example, polyesters, polyolefins, and polycarbonates. Specifically, the release liner materials described above with respect to film layer 10 may be mentioned. The film layer 40 as a release liner is in releasable contact with one surface of the pressure-sensitive adhesive layer 21 in the thickness direction H. The surface of such a film layer 40 (the surface on the pressure-sensitive adhesive layer 21 side) is preferably subjected to release treatment. Release treatments include, for example, silicone release treatments and fluorine release treatments.

The thickness of the film layer 40 is preferably 10 μm or more, more preferably 20 μm or more, and even more preferably 30 μm or more, from the viewpoint of ensuring the protective function for the adhesive layer 21 . From the viewpoint of thinning the laminated film X, the thickness of the film layer 40 is preferably 200 μm or less, more preferably 150 μm or less, and even more preferably 100 μm or less.

The film layer 40 preferably has an extended end portion 40A, as shown in FIG. 8 (FIG. 8 is a plan view showing an example of a region of the work film W after the bonding process). The extension end portion 40A extends outward beyond the edge 10b of the film layer 10 in the width direction D2. In the present embodiment, the extension length d1 of the extension end portion 40A from the edge 10b in the width direction D2 is preferably 0 mm or more, more preferably 1 mm or more, and is preferably 50 mm or less, more preferably. is 30 mm or less. The film layer 40 having such an extended end portion 40A is preferable for forming a later-described film 41 (FIGS. 6B and 9) having an extended end portion 41A from the film layer 40. FIG. 40 A of extension edge parts may be located inside the edge 10b of the film layer 10 in the width direction D2.

After the bonding step S4, the work film W is loosened between the pair of

bonding rollers

68, 68 and the press machine 80, as shown in FIG. As a result, the work film W can be continuously fed to the

bonding rollers

68, 68 and intermittently fed to pass through the press machine 80, which will be described later.

Next, in the second outer shape processing step S5,

films

11 and 41 are formed on the film layers 10 and 40 by press working with a press machine (FIG. 2), as shown in FIG. 6A. Specifically, it is as follows.

The press machine 80 includes, for example, an intermittent feeder, a machining stage, and a press blade arranged above the stage (all not shown). The intermittent feeding device of the press machine 80 intermittently supplies the region to be processed on the work film W onto the processing stage. On the processing stage, press processing is performed by press blades for each processing scheduled area of the work film W that is intermittently supplied. Specifically, as shown in FIG. 6A, by pressing a press blade (not shown) against the work film W from the film layer 40 side, the film layers 10 and 40 are cut on the carrier film C (see FIG. 6A). In 6A, the cut point is schematically indicated by a thick dotted line). As a result,

films

11 and 41 having a predetermined plan view shape are formed in the film layers 10 and 40 . FIG. 9 is a plan view showing an example of a region of the work film W after the second outer shape processing step S5. In addition, in this step, the peripheral portion 12 is formed around the film 11 in the film layer 10 . A peripheral portion 42 is formed around the film 41 in the film layer 40 .

It is preferable that the cut portions of the film layer 10 and the film layer 40 in the second outer shape processing step S5 are substantially separated from the adhesive layer 21 in the plane direction orthogonal to the thickness direction H. Such preferred forms are specifically as follows. The film 11 has an extension end 11A extending outward from the edge 21a of the adhesive layer 21 in the width direction D2. The extension length d2 of the extension end portion 11A from the edge 21a is preferably 0.5 mm or more, more preferably 1 mm, from the viewpoint of suppressing the above-described second blocking in the laminated film Y manufactured later. That's it. The extension length d2 is, for example, 10 mm or less. The film 41 has an extension end portion 41A extending outward from the edge 21a of the adhesive layer 21 in the width direction D2. The extension length d3 of the extension end portion 41A from the edge 21a is preferably 0.5 mm or more, more preferably 1 mm or more, from the viewpoint of suppressing the above-described second blocking in the laminated film Y described later. . The extension length d3 is, for example, 10 mm or less. The cut portions of the film layer 10 and the film layer 40 in the second contour processing step S5 may not be substantially separated from the adhesive layer 21 in the plane direction orthogonal to the thickness direction H. In that case, the extension length d2 is, for example, 0.5 mm or less, preferably 0 mm, and the extension length d3 is, for example, 0.5 mm or less, preferably 0 mm.

In this step, preferably, as shown in FIGS. 6B and 9, the outside of the film layer 10 in the width direction D2 is cut. Thereby, it is possible to form the film 41 having the extended end portion 41A longer than the extended end portion 11A in the width direction D2. Such a film 41 is easily peeled off from the adhesive layer 21 . Such a film 41 is, for example, easier to peel off from the adhesive layer 21 than the film 11 . The difference d4 (=d3-d2) in the extension length in the width direction D2 between the extension end portion 41A of the film 41 and the extension end portion 11A of the film 11 ensures ease of peeling of the film 41. From the viewpoint of reducing the thickness, the thickness is preferably 1 mm or more, more preferably 2 mm or more, and still more preferably 3 mm or more. The difference d4 is, for example, 15 mm or less. In this step, the inside of the film layer 10 in the width direction D2 may be cut. When the film layer 10 and the film layer 40 are cut (full cut) inside the film layer 10, the

films

11 and 41 having substantially the same dimension in the width direction D2 are formed. In

such films

11 and 41, the lengths of the extending ends 11A and 41A in the width direction D2 are also substantially the same. When the film layer 40 is cut (full cut) inside the film layer 10 and the film layer 10 is half cut, the film 11 having the extended end portion 11A longer than the extended end portion 41A of the film 41 is formed. be. Such a film 11 is easier to peel off from the adhesive layer 21 than the film 41 does. In this case, the difference d4 (=d3-d2) in the extension length in the width direction D2 between the extension end portion 41A of the film 41 and the extension end portion 11A of the film 11 is the ease of peeling of the film 11. is preferably −1 mm or less, more preferably −2 mm or less, still more preferably −3 mm or less, and is, for example, −15 mm or more. That is, when the extending lengths of the extending ends 11A and 41A are different, the absolute value (|d3−d2|) of the difference d4 between the extending lengths of the extending ends 11A and 41A is preferably 1 mm or more, It is more preferably 2 mm or more, still more preferably 3 mm or more, and is, for example, 15 mm or less.

After the second contouring step S5, the work film W is loosened between the press machine 80 and the pair of nip

rollers

69, 69, as shown in FIG. As a result, the work film W can be intermittently fed for passing through the press machine 80 and continuously fed downstream after the nip

rollers

69 , 69 . The work film W is nipped between the pair of nip

rollers

69 , 69 . Specifically, the work film W is sandwiched between the pair of nip

rollers

69, 69, and each nip roller 69 is rotated at a constant speed to pull the work film W and feed it downstream. As a result, an appropriate tension can be applied to the work film W downstream after the nip roller 69 . Appropriate tension is applied to the work film W downstream after the nip roller 69, so that the lamination film Y, which will be described later, can be properly peeled off and collected from the carrier film C.

Next, from the work film W that has passed between the nip

rollers

69, 69, the

peripheral portions

12, 42 are removed as shown in FIG. 6C. For example, the

peripheral portions

12 and 42 are removed from the work film W by a peeling roller (not shown) having the same mechanism as the peeling roller 63 . As a result, the sheet-like laminated film Y remains on the carrier film C. As shown in FIG. Laminated film Y has film 11, adhesive layer 21, and film 41 in the thickness direction H in this order. When the film 11 is the release liner described above, the film 11 is, for example, a heavy release liner that requires a greater force (peeling force) to separate from the adhesive layer 21 than the film 41 . In this case, the film 41 is a light release liner whose release force from the adhesive layer 21 is smaller than that of the film 11 . Alternatively, the film 11 is a light release liner whose release force from the adhesive layer 21 is less than that of the film 41, and the film 41 is a heavy release liner whose release force from the adhesive layer 21 is greater than that of the film 11. good too. When the film 11 is the functional optical film described above, the film 11 and the adhesive layer 21 form a functional optical film with an adhesive layer. In this case, the film 41 is, for example, a release liner releasably in contact with the adhesive layer side of the functional optical film. When the film 11 is the base film (support film) described above, the film 11 and the adhesive layer 21 form a single-sided adhesive sheet. In this case, the film 41 is, for example, a release liner releasably in contact with the adhesive layer side of the single-sided adhesive sheet.

After that, after peeling the laminated film Y from the carrier film C, the carrier film C is wound up by the first winding roller described above. Alternatively, the carrier film C with the laminated film Y is wound up by the first winding roller.

In the manner described above, laminated film Y (laminated film having an adhesive layer) can be produced.

In the first shape processing step S2 of the present manufacturing method, the original adhesive layer 20 on the film layer 10 is cut by irradiation with a laser beam, and the individualized adhesive layers 21 are formed in the original adhesive layer 20. be. Laser processing is suitable for continuously processing the original adhesive layer 20 while continuously flowing the work film W (the work film W needs to be sent intermittently for the contour processing of the original adhesive layer 20). there is no). Therefore, this manufacturing method is suitable for efficiently manufacturing the laminated film Y having the pressure-sensitive adhesive layer 21 .

In the first outer shape processing step S2, the material of the original adhesive layer 20 is evaporated and removed in the portion where the original adhesive layer 20 is irradiated with the laser beam. That is, in the first contouring step S2, the original adhesive layer 20 is partially removed, so that the adhesive layer 21 and the surrounding portion 22 are separated from each other in the original adhesive layer 20 . Since the original adhesive layer 20 is not cut into the adhesive layer 21 and the peripheral portion 22 by the pressing of the press blade, the adhesive layer 21 and the peripheral portion 22 are not subject to the revertive deformation described above with respect to the conventional manufacturing method. does not occur. In such a first shape processing step S2, even when the original adhesive layer 20 is soft and easily deformed, the above-described first blocking between the adhesive layer 21 and the peripheral portion 22 is prevented. suitable for suppressing the occurrence of

In the second outer shape processing step S5 of this manufacturing method, as described above, the film layers 10 and 40 on the carrier film C are cut by pressing the press blade against the work film W from the film layer 40 side. . Such press working is performed without further contouring the pressure-sensitive adhesive layer 21 in a state in which the pressure-sensitive adhesive layer 21 that has already been contoured is disposed between the film layers 10 and 40. suitable for In the second contouring step S5, when the film 41 is contoured without contouring the adhesive layer 21, the portion to be cut in the film layer 40 is not sufficiently supported by the adhesive layer 21, so the thickness The position in the vertical direction H tends to fluctuate. Therefore, if laser processing is performed instead of press processing in the second outer shape processing step S5, it is difficult to focus the laser beam on the film layer 40. FIG. Therefore, the film layer 40 cannot be properly cut by laser processing. On the other hand, in the second outer shape processing step S5 of this manufacturing method, the film layer 40 can be appropriately cut by pressing it with a press blade.

As described above, this manufacturing method is suitable for efficiently manufacturing the laminated film Y having the soft adhesive layer 21 .

The cut portions of the film layers 10 and 40 in the second outer shape processing step S5 are separated from the pressure-sensitive adhesive layer 21 in the plane direction (flow direction D1, width direction D2) perpendicular to the thickness direction H, as described above. is preferred. The

films

11 and 41 formed by such a second trimming step S5 have extension ends 11A and 41A extending outward from the edge 21a of the adhesive layer 21. As shown in FIG. The laminated film Y comprising

such films

11 and 41 is suitable for suppressing the adhesive layer 21 from protruding from the edges of the

films

11 and 41, and is therefore suitable for suppressing the second blocking described above. .

In this manufacturing method, the first outer shape processing step S2 does not include loosening the work film W before the work film W is irradiated with laser light. Such a manufacturing method does not require adjustment and control for loosening the work film W before laser processing in the manufacturing line described above, and is preferable for efficiently manufacturing the laminated film Y having the adhesive layer 21 . On the other hand, in the present manufacturing method, the first contouring step S2 may include loosening the work film W before the work film W is irradiated with laser light, as shown in FIG.

In this manufacturing method, the first outer shape processing step S2 does not involve loosening the work film W after the work film W is irradiated with laser light. Such a manufacturing method does not require adjustment and control for loosening the work film W after laser processing in the manufacturing line described above, and is preferable for efficiently manufacturing the laminated film Y having the adhesive layer 21 . In addition, the fact that the first outer shape processing step S2 does not include loosening the work film W after laser light irradiation is suitable for avoiding the work film bending with a relatively large radius of curvature in the production line. Suitable for suppressing the first blocking described above between the layer 21 and the peripheral portion 22 (curvature of the work film W shortens the separation distance between the adhesive layer 21 and the peripheral portion 22). , increasing the probability that the first blocking occurs). On the other hand, in the present manufacturing method, the first contouring step S2 may include loosening the work film W after irradiating the work film W with laser light, as shown in FIG.

The manufacturing method of the present invention is, for example, a method of manufacturing a laminated film having an adhesive layer used for bonding between elements included in the laminated structure of a display panel.

W work film X laminated film (laminated film having an adhesive layer)
C carrier film H thickness direction D1 length direction D2 width direction 10 film layer (first film layer)
20 original adhesive layer 21 adhesive layer 22 peripheral portion (first peripheral portion)
30 film layer (second film layer)
31 film (second film)
32 Perimeter (Second Perimeter)
40' film 40 film layer (third film layer)
41 film (third film)
70 laser processing machine 62 nip roller 80 press processing machine

Claims

A roll-to-roll manufacturing method for a laminated film having an adhesive layer,
For a long work film comprising a carrier film, a first film layer, an original pressure-sensitive adhesive layer, and a second film layer in this order in the thickness direction, from the second film layer side in the thickness direction By irradiating with a laser beam, the original adhesive layer and the second film layer are cut on the first film layer, and in the original adhesive layer, the individualized adhesive layer and the adhesive layer forming a first peripheral portion around the first peripheral portion, and in the second film layer, forming a second film on the adhesive layer and a second peripheral portion on the first peripheral portion around the second film; a first contouring step;
a removing step of removing the second peripheral portion, the first peripheral portion and the second film from the work film;
a laminating step of laminating a long film as a third film layer on the adhesive layer side of the work film after the removing step;
After the laminating step, a press blade is pressed against the work film from the third film layer side to cut the first film layer and the third film layer on the carrier film, thereby cutting the first film layer and the third film layer. A method for producing a laminated film having an adhesive layer, comprising a second contouring step of forming a first film on the film layer and forming a third film on the third film layer.
The pressure-sensitive adhesive according to claim 1, wherein the cut portions of the first film layer and the third film layer in the second contouring step are separated from the pressure-sensitive adhesive layer in a plane direction perpendicular to the thickness direction. A method for producing a laminated film having layers.
2. Manufacture of a laminated film having an adhesive layer according to claim 1, further comprising a nipping step of pinching and pulling the work film between a pair of rollers after the first trimming step and before the removing step. Method.
The method for manufacturing a laminated film having an adhesive layer according to claim 1, wherein said first contouring step does not include loosening said work film before irradiating said work film with said laser light.
The laminate film having the pressure-sensitive adhesive layer according to any one of claims 1 to 4, wherein the first contouring step does not include loosening the work film after irradiating the work film with the laser light. manufacturing method.