KR20220101022A - Manufacturing method of laminated polarizing film - Google Patents

Abstract

Adhesive coating step of applying the adhesive 65 to the protective film 12 using the coating roll 641, the protective film 12 coated with the adhesive 65 and the polarizer 1c, the nip roll 671 It has a lamination process of passing through and bonding together, and the said protective film 12 in the exit side of the said coating roll 641 of the said adhesive agent coating process becomes the range of 20 degreeC - 35 degreeC, and in the said lamination process The said protective film 12 in the exit side of the said nip roll 671 is the range of 20 degreeC - 35 degreeC.

Description

Manufacturing method of laminated polarizing film

This invention relates to the method of manufacturing a laminated polarizing film by bonding a polarizer and a protective film through an adhesive agent.

DESCRIPTION OF RELATED ART Conventionally, the laminated polarizing film containing a polarizer is used as constituent materials, such as a liquid crystal display device and polarizing sunglasses. As said laminated polarizing film, the film containing the polarizer dyed with dichroic substances, such as iodine, and the protective film which protects this polarizer, is used, for example.

Such a laminated polarizing film is obtained by sticking a protective film on the single side|surface or both surfaces of a polarizer with a specific adhesive agent, as described in patent documents 1 and 2, for example.

Specifically, in patent documents 1 and 2, a polarizer is manufactured by extending|stretching, dyeing a polyvinyl alcohol-type resin film with an iodine solution, water washing, and bonding a protective film to this polarizer via an adhesive agent, a laminated polarizing film is disclosed.

Japanese Patent Laid-Open No. 2014-129505 Japanese Laid-Open Patent Publication No. 2018-127610

However, after coating an adhesive agent on a protective film, when the protective film to which the adhesive agent adheres is pasted together to a polarizer, an adhesive agent may impregnate a protective film too much, in that case, an adhesive agent does not harden|cure well, and an adhesive agent There is a possibility of partial peeling in the interlayer with. On the other hand, if the adhesive does not impregnate the protective film that much, the adhesive does not adhere well to the protective film, and there is a possibility that the adhesive may be partially peeled between the layers with the adhesive.

An object of the present invention is to provide a method for producing a laminated polarizing film in which a polarizer and a protective film are satisfactorily adhered via an adhesive.

The method for producing a laminated polarizing film of the present invention includes an adhesive coating step of applying an adhesive to the protective film using a coating roll, and a lamination step of bonding the protective film and the polarizer coated with the adhesive through a nip roll, , the said protective film in the exit side of the said coating roll of the said adhesive agent coating process becomes the range of 20 degreeC - 35 degreeC, The said protective film in the exit side of the said nip roll in the said lamination process This is in the range of 20°C to 35°C.

In a preferred manufacturing method of the present invention, the protective film is a transparent film having a surface that is easily adhered to the adhesive.

In the preferable manufacturing method of this invention, the said protective film is a triacetyl cellulose film.

A preferred manufacturing method of the present invention is a film with a urethane-based easy-to-adhesive agent.

A preferable manufacturing method of this invention is an acrylic film with a urethane type easy adhesion agent.

In the preferable manufacturing method of this invention, the said adhesive agent is an active-energy-ray-curable adhesive agent.

In the preferable manufacturing method of this invention, the said adhesive agent is coated to the said protective film in 0.1 micrometer - 5 micrometers in thickness.

After the preferable manufacturing method of this invention coats the said adhesive agent to the said protective film, it bonds the said polarizer to the said protective film between 2 second - 30 second.

The preferable manufacturing method of this invention hold|maintains the said protective film between the exit side of the said coating roll to the exit side of the said nip roll in the range of 20 degreeC - 35 degreeC.

ADVANTAGE OF THE INVENTION According to the manufacturing method of this invention, the laminated polarizing film which a polarizer and a protective film adhere|attached favorably through an adhesive agent can be manufactured.

BRIEF DESCRIPTION OF THE DRAWINGS It is sectional drawing of the laminated polarizing film which concerns on one Embodiment of this invention.
It is sectional drawing of the laminated polarizing film which concerns on another embodiment of this invention.
It is sectional drawing of the laminated polarizing film which concerns on another embodiment of this invention.
It is schematic which shows the manufacturing apparatus of the laminated polarizing film of this invention.

In this specification, the numerical range represented by "the lower limit X - the upper limit Y" means the lower limit X or more and the upper limit Y or less. When a plurality of the numerical ranges are separately described, an arbitrary lower limit value and an arbitrary upper limit value are selected, and "arbitrary lower limit value - arbitrary upper limit value" shall be settable.

Each drawing is shown for reference, please note that the dimension, scale, and shape of the member etc. shown in each drawing may differ from an actual thing.

[Laminated Polarizing Film]

The laminated polarizing film obtained by the manufacturing method of this invention has a polarizer and the protective film adhered to at least single side|surface of the said polarizer using an adhesive bond layer.

1-3 has shown some structural examples of the laminated polarizing film 1 obtained by the manufacturing method of this invention.

1, the laminated polarizing film 1 of one Embodiment of this invention is the 1st protective film 12, the adhesive bond layer 31, the polarizer 11, the adhesive bond layer 32, The 2nd protective film 13 is laminated|stacked in this order.

In FIG. 2, the laminated polarizing film 1 of another embodiment of this invention is the protective film 12, the adhesive bond layer 31, the polarizer 11, the adhesive bond layer 33, and arbitrary optics. The films 14 are laminated in this order.

In FIG. 3, the laminated polarizing film 1 of another embodiment of this invention is the 1st protective film 12, the adhesive bond layer 31, the polarizer 11, the adhesive bond layer 32, and 2 The protective film 13, the adhesive bond layer 34, and the arbitrary optical film 14 are laminated|stacked in this order.

However, the laminated polarizing film of this invention is not limited to the structural example of FIGS. 1-3, It can change suitably.

For example, one or more arbitrary other optical films may be laminated|stacked on the laminated polarizing film of each said structural example further.

<Polarizer>

A polarizer refers to an optical element having a property of transmitting light (polarized light) vibrating only in one specific direction and blocking light vibrating in other directions. The polarizer of this invention is a flexible film form.

Specifically, the polarizer of this invention is manufactured by the wet process mentioned later. The polarizer is made of a hydrophilic polymer film dyed with a dichroic substance and stretched (for example, a polyvinyl alcohol-based film dyed with a dichroic substance and stretched, etc.).

<protection film>

A protective film is a film formed in order to protect a polarizer. As a protective film, a colorless and transparent film can be used.

As the colorless and transparent protective film, for example, a triacetyl cellulose film (TAC film), an acrylic film (a film using an acrylic polymer), a polyethylene terephthalate film, a polyolefin film having a cyclo or norbornene structure, etc. can be used. have.

As for a protective film, it is preferable to use the transparent film which has the surface of easy adhesion with respect to an adhesive agent (particularly, the active energy ray hardening-type adhesive agent mentioned later).

The transparent film having an easily-adhesive surface is easily mixed with an adhesive on the surface or easily permeated with an adhesive.

A transparent film having a surface that can easily adhere to an adhesive is a film in which (a) the film itself is formed of a material having easy adhesion to the adhesive, (b) the film itself is made of a material having easy adhesion to the adhesive. The film is formed, and the surface of the film is subjected to an easy-adhesion treatment, (c) the film itself is formed of a material that is resistant to adhesion to the adhesive, but is easily attached to the surface of the film a film on which is applied; and the like are mentioned.

As a transparent film of said (a), a TAC film, an acrylic film, etc. are mentioned.

As the transparent film of (b) or (c), a film coated with an easy-adhesive agent on at least one side of any transparent film (protective film with an easy-adhesive agent), a film coated with an easy-to-adhesive composition (the easy-adhesive layer is attached film) and the like. Although the adhesive agent is not specifically limited, It is preferable to use the adhesive agent containing a urethane-type resin at the point which is excellent in the adhesiveness with respect to an active energy ray-curable adhesive agent.

As an easily bonding composition, so that it may mention later, the easily bonding composition etc. which are coated on a polarizer are mentioned.

<Optical film>

As arbitrary optical films, a conventionally well-known thing can be used, For example, retardation film, an anti-glare film, a brightness improvement film, a viewing angle improvement film, a transparent conductive film, etc. are mentioned.

<Adhesive layer>

An adhesive bond layer is a layer which is interposed between two films as a solidification layer of an adhesive agent, and adhere|attaches the two films.

1 to 3, adhesive layers 31 and 32 for bonding the polarizer 11 and the protective film 12, and the adhesive layer 33 for bonding the polarizer 11 and the optical film 14 and the adhesive bond layer 34 which adhere|attaches the protective film 13 and the optical film 14 are not specifically limited, respectively, It is comprised from a conventionally well-known adhesive agent. As said adhesive agent, a solvent volatilization type adhesive agent, a two-component reaction type adhesive agent, an active energy ray hardening type adhesive agent, etc. are mentioned. Preferably, an active energy ray-curable adhesive can be used. It is preferable to use an active energy ray hardening-type adhesive agent, when bonding a polarizer and a protective film at least.

For example, in the case of each laminated polarizing film 1 of FIG. 1 and FIG. 3, it is preferable that all of the adhesive bond layers 31 and 32 are comprised by the active energy ray hardening-type adhesive agent. In the case of the laminated polarizing film 1 of FIG. 2, it is preferable that the adhesive bond layer 31 is comprised by the active energy ray hardening-type adhesive agent. About the adhesive bond layers 33 and 34, although it may be comprised with an active energy ray hardening-type adhesive agent, or may be comprised with adhesive agents other than that, Preferably, it is comprised with an active energy ray-curable adhesive agent.

An active energy ray hardening-type adhesive agent is demonstrated in detail later.

[A polarizer manufacturing apparatus and a laminated polarizing film manufacturing apparatus]

The manufacturing apparatus of the polarizer of this invention is the wet processing apparatus which manufactures the elongate band-shaped polarizer by dyeing and extending|stretching a long band-shaped hydrophilic polymer film with a dyeing process liquid, and the said wet processing apparatus It has a drying apparatus which dries a polarizer.

Moreover, the manufacturing apparatus of the laminated polarizing film of this invention is a wet processing apparatus which manufactures a long strip|belt-shaped polarizer by extending|stretching while dyeing a long strip|belt-shaped hydrophilic polymer film with a dyeing process liquid, and the said wet processing apparatus obtained It has the drying apparatus which dries a polarizer, and the lamination apparatus which bonds the said polarizer and a protective film together.

After the manufacturing apparatus of the said polarizer manufactures a long strip|belt-shaped polarizer from a long strip|belt-shaped hydrophilic polymer film with a wet processing apparatus, the drying apparatus dries the polarizer continuously. That is, the wet processing apparatus and the drying apparatus are arrange|positioned on one production line.

The manufacturing apparatus of the said laminated polarizing film may be a form which adhere|attaches a protective film continuously to the polarizer dried with the manufacturing apparatus of the said polarizer with a lamination apparatus. Or the manufacturing apparatus of the said laminated polarizing film may once wind up the polarizer dried with the manufacturing apparatus of the said polarizer in roll shape, take out the roll-shaped polarizer, and the form which adhere|attaches a protective film with a lamination apparatus may be sufficient. The former format is a format in which a series of steps from manufacture of the polarizer until the protective film is adhered to obtain a laminated polarizing film is performed on one production line, and the latter format is the production of the polarizer on one production line It is a type which performs the process of carrying out, affixing a protective film to the polarizer, and obtaining a laminated polarizing film on another production line.

As for the manufacturing apparatus of the laminated polarizing film of this invention, the format which performs a series of processes from manufacture of a polarizer to adhere|attaching a protective film and obtaining a laminated polarizing film on one production line is preferable. As for the manufacturing apparatus of this type of laminated polarizing film, the manufacturing apparatus of the polarizer which has a wet processing apparatus and a drying apparatus, and a lamination apparatus are arrange|positioned on one production line.

4 : shows the preferable structural example of the manufacturing apparatus 2 of a laminated polarizing film.

With reference to FIG. 4, the manufacturing apparatus 2 of a laminated polarizing film has the wet processing apparatus 4, the drying apparatus 5, and the laminating apparatus 6 in order from an upstream.

The wet processing apparatus 4 includes a first roll portion 41 on which an untreated, untreated, hydrophilic polymer film 1a in the shape of a long strip is wound, a conveying unit 42 conveying the hydrophilic polymer film 1a, and a processing unit has The said processing part is a part which processes a dichroic substance to the unprocessed hydrophilic polymer film 1a, and changes the hydrophilic polymer film 1a into the polarizer 1b.

The said drying apparatus 5 has the conveyance part 51 which conveys the elongate strip|belt-shaped polarizer 1b, and the heating part which gives heat to the polarizer 1b and dries the polarizer 1b.

The laminating apparatus 6 includes a conveying unit 61 for conveying the polarizer 1c and the protective film 12 after drying, an adhesive coating part 64, a bonding part 67, and the adhesive coating part ( 64 ) and a chamber 69 surrounding the bonding portion 67 .

<Wet treatment device>

The wet processing apparatus 4 includes the processing part which stretches while dyeing|staining the elongate strip|belt-shaped hydrophilic polymer film 1a with a dyeing process liquid. The wet treatment includes a treatment of stretching the hydrophilic polymer film 1a while allowing a plurality of treatment liquids containing a dyeing treatment liquid to act on the hydrophilic polymer film 1a.

A wet processing apparatus is conventionally well-known, and a conventionally well-known structure can be employ|adopted also about the wet processing apparatus 4 of this invention.

The processing unit includes, for example, in order from the upstream side, a swelling treatment tank 4A, a dyeing treatment tank 4B, a crosslinking treatment tank 4C, a stretching treatment tank 4D, a washing treatment tank ( 4E).

The conveyance part 42 of the wet processing apparatus 4 has a some guide roll etc., and withdraws the elongate strip|belt-shaped hydrophilic polymer film 1a wound around the 1st roll part 41, and conveys it to the said processing part. .

The white arrow in FIG. 4 shows the advancing direction (conveyance direction) of the film conveyed.

The hydrophilic polymer film 1a is in the shape of a long band. In this specification, the elongate strip|belt shape means the rectangular shape whose length in the longitudinal direction is sufficiently larger than the length in the width direction (the width direction is a direction orthogonal to a longitudinal direction). The length in the longitudinal direction of the elongate band is, for example, 10 m or more, and preferably 50 m or more.

It does not specifically limit as said hydrophilic polymer film 1a, A conventionally well-known film can be used. Specifically, as the hydrophilic polymer film (1a), for example, a polyvinyl alcohol (PVA)-based film, a partially formalized PVA-based film, a polyethylene terephthalate (PET) film, an ethylene/vinyl acetate copolymer-based film, these of partially saponified films. Moreover, in addition to these, polyene-oriented films, such as a dehydration-processed product of PVA and a dehydrochloric acid-treated product of polyvinyl chloride, and a stretch-oriented polyvinylene-type film, etc. can also be used. Among these, a PVA-type polymer film is preferable at the point especially excellent in the dyeability by a dichroic substance.

Examples of the raw material polymer for the PVA-based polymer film include a polymer obtained by polymerization of vinyl acetate and then saponified, and a polymer obtained by copolymerizing a small amount of a copolymerizable monomer such as unsaturated carboxylic acid or unsaturated sulfonic acid with respect to vinyl acetate. can Although the polymerization degree of the said PVA-type polymer is not specifically limited, From the point of the solubility with respect to water, etc., 500-10000 are preferable, More preferably, it is 1000-6000. Moreover, as for the saponification degree of the said PVA-type polymer, 75 mol% or more is preferable, More preferably, they are 98 mol% - 100 mol%.

Although the thickness of the unprocessed hydrophilic polymer film 1a is not specifically limited, For example, they are 15 micrometers - 110 micrometers.

The swelling treatment tank 4A is a treatment tank in which the swelling treatment liquid was accommodated. The swelling treatment liquid swells the hydrophilic polymer film 1a. As the said swelling treatment liquid, water can be used, for example. Moreover, it is good also considering the water which added appropriate amount of iodine compounds, such as glycerol and potassium iodide, to water as a swelling treatment liquid. When glycerol is added, the concentration is preferably 5% by weight or less, and when an iodine compound such as potassium iodide is added, the concentration is preferably 10% by weight or less.

The dyeing process tank 4B is a process tank in which the dyeing process liquid was accommodated. The dyeing treatment liquid dyes the hydrophilic polymer film 1a. As said dyeing process liquid, the solution containing a dichroic substance as an active ingredient is mentioned. As a dichroic substance, an iodine, an organic dye, etc. are mentioned. Preferably, as the dyeing treatment solution, a solution in which iodine is dissolved in a solvent can be used. As the solvent, water is generally used, but an organic solvent compatible with water may be further added. Although it does not specifically limit as a density|concentration of iodine in a dyeing treatment liquid, It is preferable that it is 0.01 weight% - 10 weight%, The range of 0.02 weight% - 7 weight% is more preferable, It is 0.025 weight% - 5 weight% more preferably. In order to further improve dyeing efficiency, you may add an iodine compound to a dyeing process liquid as needed. An iodine compound is a compound containing an element other than iodine and iodine in a molecule|numerator, For example, potassium iodide, lithium iodide, sodium iodide, zinc iodide, aluminum iodide, lead iodide, copper iodide, barium iodide, calcium iodide, iodide. Tin, titanium iodide, etc. are mentioned.

The crosslinking treatment tank 4C is a treatment tank in which the crosslinking treatment liquid is accommodated. The crosslinking treatment liquid crosslinks the dyed hydrophilic polymer film 1a. As the crosslinking treatment liquid, a solution containing a boron compound as an active ingredient can be used. For example, as a crosslinking treatment liquid, a solution in which a boron compound is dissolved in a solvent can be used. As the solvent, water is generally used, but an organic solvent compatible with water may be further added. As a boron compound, a boric acid, borax, etc. are mentioned. Although it does not specifically limit as a density|concentration of a boron compound in a crosslinking-treatment liquid, It is preferable that it is 1 weight% - 10 weight%, 2 weight% - 7 weight% are more preferable, It is still more that it is 2 weight% - 6 weight%. desirable. Moreover, since the polarizer which has uniform optical characteristic is obtained, you may add an iodine compound to the said crosslinking treatment liquid as needed.

The stretching treatment tank 4D is a treatment tank in which the stretching treatment liquid is accommodated.

Although the extending|stretching process liquid is not specifically limited, For example, the solution containing a boron compound as an active ingredient can be used. As the stretching treatment liquid, for example, a solution in which a boron compound and, if necessary, various metal salts, zinc compounds, etc. are dissolved in a solvent can be used. As the solvent, water is generally used, but an organic solvent compatible with water may be further added. Although it does not specifically limit as a density|concentration of the boron compound in an extending|stretching process liquid, It is preferable that they are 1 weight% - 10 weight%, and 2 weight% - 7 weight% are more preferable. You may add an iodine compound to the said extending|stretching process liquid as needed from a viewpoint of suppressing the elution of the iodine made to adsorb|suck to the film.

The washing treatment tank 4E is a treatment tank in which the washing treatment liquid is accommodated. The washing treatment liquid washes the hydrophilic polymer film 1a after stretching. The washing treatment liquid is a treatment liquid for washing a treatment liquid such as a dyeing treatment liquid or a crosslinking treatment liquid adhering to the hydrophilic polymer film 1a. As the washing treatment liquid, water such as ion-exchange water, distilled water, and pure water is typically used.

In addition, in the illustrated example, the treatment unit has a swelling treatment tank 4A, a dyeing treatment tank 4B, a crosslinking treatment tank 4C, a stretching treatment tank 4D and a washing treatment tank 4E, but a dyeing treatment tank ( 4B), on condition that it has, you may abbreviate|omit one or two treatment tanks among these. In addition, the said processing part may have an adjustment processing tank (not shown) further. The adjustment processing tank is a processing tank in which the adjustment processing liquid was accommodated. Although this adjustment treatment tank is not shown in FIG. 5, it is provided between the said crosslinking treatment tank 4C and the extending|stretching treatment tank 4D, or between the extending|stretching treatment tank 4D and the washing|cleaning treatment tank 4E. The said adjustment process liquid is a solution for color adjustment of a film, etc., The solution containing an iodine compound can be used as an active ingredient.

<Drying device>

The drying apparatus 5 is provided on the downstream side of the said wet processing apparatus 4 and upstream of the lamination apparatus 6 . In the illustrated example, the drying apparatus 5 is provided on the downstream side of the washing processing tank 4E.

The number of drying apparatuses 5 may be one, or two or more may be provided side by side in the conveyance direction of a polarizer. In the example of illustration, one drying apparatus 5 is provided in the conveyance path|route of a polarizer, for example.

The drying apparatus 5 includes a conveyance part 51 having a guide roll for conveying the elongate band-shaped polarizer 1b manufactured by the wet processing apparatus 4, and a longitudinal direction ( It has a heating part which heats and dries the polarizer 1b conveyed by MD direction).

The heating unit has, for example, a chamber 52 and a heat source (not shown). The chamber 52 has a space 53 capable of transporting a polarizer therein. As a heat source, warm air can be used, for example. A duct (not shown) for sending warm air is disposed on the inner wall of the chamber 52 . Air (warm air) heated by a heat source not shown is blown out into the space 53 of the chamber 52 through the duct.

The polarizer 1b which entered the space 53 from the slit-shaped entrance on the upstream side of the chamber 52 is conveyed out of the chamber 52 from the slit-shaped outlet on the downstream side of the chamber 52 after being dried by a heat source.

<Lamination device>

The conveyance part 61 of the lamination apparatus 6 has a guide roll etc. The said conveyance part 61 conveys the elongate strip|belt-shaped polarizer 1c dried by the said drying apparatus 5 to the pasting part 67. Moreover, the said conveyance part 61 conveys the elongate strip|belt-shaped protective film 12 etc. to the pasting part 67.

The manufacturing apparatus 2 of the laminated polarizing film of an illustration can laminate|stack the 1st protective film 12 and the 2nd protective film 13 on both surfaces of the polarizer 1c, respectively. According to this apparatus, as shown in FIG. 1, the 1st protective film 12/adhesive agent layer 31/polarizer 11/adhesive agent layer 32/laminate which has the laminated constitution of the 2nd protective film 13 A polarizing film (1) is obtained.

Such a manufacturing apparatus 2 is the 2nd roll part 62 around which the 1st protective film 12 in elongate strip shape was wound, and the 3rd roll part 63 in which the 2nd elongate strip-shaped protective film 13 was wound. ) has The 1st protective film 12 of the 2nd roll part 62 and the 2nd protective film 13 of the 3rd roll part 63 are each independently from each roll part 62, 63 by the conveyance part 61, respectively. It is conveyed to the pasting part 67.

The adhesive coating part 64 has a coating roll 641 . The coating roll 641 of the adhesive agent coating part 64 coats an adhesive agent to a film. The adhesive agent coating part 64 is arrange|positioned upstream of the bonding part 67.

In the lamination apparatus 6 of the illustration example, the adhesive agent coating part 64 is arrange|positioned on the single side|surface side of the 1st protective film 12, and the single side|surface side of the 2nd protective film 13, respectively.

An adhesive layer can be formed by coating an adhesive on one side of the first protective film 12 by means of one adhesive coating part 64 , and the second protective film 13 is formed by using another adhesive coating part 64 . An adhesive layer may be formed by coating an adhesive on one side.

Moreover, the adhesive agent coating part may be arrange|positioned also on the single side|surface side of the polarizer 1c, and the other single side side of the polarizer 1c as needed (not shown). When this unillustrated adhesive coating part is provided, an adhesive agent layer can be formed by respectively coating an adhesive agent on the single side|surface side of the polarizer 1c and the other single side side of the polarizer 1c.

Moreover, in order to coat the easily bonding composition mentioned later, the adhesive agent coating part arrange|positioned, respectively on the single side|surface side of the polarizer 1c and the other one side side of this polarizer 1c can also be used.

The adhesive coating part 64 has a gravure roll 641 which is a coating roll, the container 642 in which the adhesive agent was stored, and the doctor blade 643, for example. Moreover, you may have a backup roll as needed. The backup roll is disposed opposite to the gravure roll roll 641 with the film interposed therebetween.

The gravure roll 641 has a plurality of cells (concave portions into which the adhesive enters) formed on the surface. The gravure roll 641 rotates about its axis so that its surface contacts the adhesive 65 stored in the container 642 (the direction of rotation of the gravure roll 641 is indicated by an arrow). With rotation, the adhesive 65 adheres to the cell-containing surface of the gravure roll 641 , and the excess adhesive 65 is scraped off into the container 642 by the doctor blade 643 . When the gravure roll 641 having the adhesive in the cell contacts the film, the adhesive 65 in the cell is transferred to one side of the first protective film 12 and the second protective film 13 . In this way, from the gravure roll 641 to the single side|surface of the 1st protective film 12 and the 2nd protective film 13, the adhesive agent 65 is respectively coated in the solid state.

Although the adhesive agent which adheres the polarizer 1c, the 1st protective film 12, and the 2nd protective film 13 is not specifically limited, As mentioned above, it is preferable to use an active energy ray hardening-type adhesive agent. As an active energy ray hardening-type adhesive agent, a conventionally well-known thing can be used. Generally, an active energy ray hardening-type adhesive agent contains an active energy ray-curable component and a polymerization initiator, and contains various additives as needed.

The active energy ray-curable component can be broadly divided into electron beam curability, ultraviolet curability, and visible ray curability. Moreover, an active energy ray-curable component can be roughly divided into a radically polymerizable compound and a cationically polymerizable compound from a viewpoint of the mechanism of hardening.

As a radically polymerizable compound, the compound which has radically polymerizable functional group of carbon-carbon double bonds, such as a (meth)acryloyl group and a vinyl group, is mentioned. Moreover, both a monofunctional radically polymerizable compound or a bifunctional or more than bifunctional radically polymerizable compound can be used. Moreover, these radically polymerizable compounds may be used individually by 1 type or may use 2 or more types together. As said radically polymerizable compound, the compound which has a (meth)acryloyl group is preferable, For example, (meth)acrylamide derivative which has a (meth)acrylamide group, (meth)acrylamide which has a (meth)acryloyloxy group. ) acrylates and the like.

The polymerization initiator in the case of using a radically polymerizable compound as an active energy ray hardening-type adhesive agent is suitably selected according to an active energy ray. In the case of curing the adhesive by ultraviolet or visible light, a polymerization initiator of ultraviolet cleavage or visible light cleavage is used. Examples of the polymerization initiator include benzophenone compounds, aromatic ketone compounds, acetophenone compounds, aromatic ketal compounds, aromatic sulfonyl chloride compounds, and thioxanthone compounds.

Examples of the cationically polymerizable compound include a monofunctional cationically polymerizable compound having one cationically polymerizable functional group in a molecule, and a polyfunctional cationically polymerizable compound having two or more cationically polymerizable functional groups in a molecule. have. As said cationically polymerizable functional group, an epoxy group, oxetanyl group, vinyl ether group, etc. are mentioned. As a cationically polymerizable compound which has an epoxy group, an aliphatic epoxy compound, an alicyclic epoxy compound, an aromatic epoxy compound, etc. are mentioned. Examples of the cationically polymerizable compound having an oxetanyl group include 3-ethyl-3-hydroxymethyloxetane, 1,4-bis[(3-ethyl-3-oxetanyl)methoxymethyl]benzene, 3- Ethyl-3-(phenoxymethyl)oxetane etc. are mentioned. As a cationically polymerizable compound which has a vinyl ether group, 2-hydroxyethyl vinyl ether, diethylene glycol monovinyl ether, 4-hydroxybutyl vinyl ether, etc. are mentioned.

When using a cationic polymerizable compound as an active energy ray hardening-type adhesive agent, a cationic polymerization initiator is mix|blended. This cationic polymerization initiator generates a cationic species or a Lewis acid by irradiation with active energy rays such as visible light, ultraviolet light, or electron beam, and initiates a polymerization reaction with the epoxy group of the cationically polymerizable compound. As a cationic polymerization initiator, a photoacid generator and a photobase generator can be used.

As a preferable active energy ray-curable adhesive agent, the adhesive agent which has an SP value as shown below can be used, for example.

That is, a preferable active energy ray hardening-type adhesive agent contains an active energy ray hardening-type compound (A), (B), and (C) as a sclerosing|hardenable component. Specifically, when the total amount of the adhesive is 100% by weight, the SP value is 29.0 (MJ/m 3 ) ^1/2 to 32.0 (MJ/m 3 ) ^1/2 active energy ray-curable compound (A) 0.0 to 15.0 20.0 to 80.0% by weight of the active energy ray-curable compound (B) having an SP value of 18.0 (MJ/m3) ^1/2 or more and less than 21.0 (MJ/m3) ^1/2 , and an SP value of 21.0 (MJ/m3) ) ^1/2 to 26.0 (MJ/m 3 ) ^1/2 to 10.0 to 80.0 wt% of the active energy ray-curable compound (C). In addition, in this invention, "adhesive total amount" means the total amount including various initiators and additives in addition to each active energy ray hardening-type compound.

Here, the calculation method of the SP value (solubility parameter) in this invention is demonstrated below.

(Calculation method of solubility parameter (SP value))

In the present invention, the solubility parameter (SP value) of the active energy ray-curable compound is determined by Fedors' calculation method ["Polymer Eng. & Sci.", Vol. 14, No. 2 (1974). ), see pages 148 to 154], that is, calculated by the following formula (where Δei is the evaporation energy at 25°C belonging to an atom or group, and Δvi is the molar volume at 25°C) can

Δei and Δvi in the above formula represent constant numerical values given respectively to i atoms and groups in the main molecule. In addition, representative examples of the numerical values of Δe and Δv given to atoms or groups are shown in Table 1 below.

The active energy ray-curable compound (A) is a compound having a radically polymerizable group such as a (meth)acrylate group and having an SP value of 29.0 (MJ/m 3 ) ^1/2 to 32.0 (MJ/m 3 ) ^1/2 It can be used without limitation. As a specific example of an active energy ray-curable compound (A), hydroxyethyl acrylamide (SP value 29.5), N-methylolacrylamide (SP value 31.5), etc. are mentioned, for example. In addition, in this specification, a (meth)acrylate group means an acrylate group and/or a methacrylate group.

The active energy ray-curable compound (B) is a compound having a radically polymerizable group such as a (meth)acrylate group and having an SP value of 18.0 (MJ/m 3 ) ^1/2 or more and 21.0 (MJ/m 3 ) ^1/2 or less. It can be used without limitation. Specific examples of the active energy ray-curable compound (B) include, for example, tripropylene glycol diacrylate (SP value 19.0), 1,9-nonanediol diacrylate (SP value 19.2), tricyclodecanedimethanol diacrylate (SP value 20.3), cyclic trimethylolpropane formal acrylate (SP value 19.1), dioxane glycol diacrylate (SP value 19.4), EO modified diglycerin tetraacrylate (SP value 20.9), etc. can be heard In addition, commercially available products can also be suitably used as the active energy ray-curable compound (B), for example, Aronix M-220 (manufactured by Toa Synthetic Co., Ltd., SP value 19.0), light acrylate 1,9ND-A (Kyoeisha Chemical Co., Ltd.) Manufactured, SP value 19.2), light acrylate DGE-4A (manufactured by Kyoeisha Chemical, SP value 20.9), light acrylate DCP-A (manufactured by Kyoeisha Chemical, SP value 20.3), SR-531 (manufactured by SARTOMER) , SP value 19.1), CD-536 (manufactured by SARTOMER, SP value 19.4), and the like.

The active energy ray-curable compound (C) is a compound having a radically polymerizable group such as a (meth)acrylate group and having an SP value of 21.0 (MJ/m 3 ) ^1/2 to 26.0 (MJ/m 3 ) ^1/2 It can be used without limitation. Specific examples of the active energy ray-curable compound (C) include, for example, acryloylmorpholine (SP value 22.9), N-methoxymethylacrylamide (SP value 22.9), N-ethoxymethylacrylamide ( SP value 22.3) and the like. In addition, as the active energy ray-curable compound (C), a commercially available product can also be suitably used, for example, ACMO (manufactured by Kyojin Corporation, SP value 22.9), Wasuma 2MA (manufactured by Kasano Kogsan Corporation, SP value 22.9), Wasuma EMA (manufactured by Kasano Heungsan, SP value 22.3), Wasuma 3MA (manufactured by Kasano Heungsan, SP value 22.4), Aronix M-5300 (manufactured by Toa Synthetic Company, SP value 23.4), and the like.

Moreover, in this invention, cure shrinkage when an active energy ray hardening-type adhesive agent hardens as acrylic equivalent _Cae of an active energy ray hardening-type adhesive agent represented by following formula (X) is 140 or more can be suppressed. Thereby, since adhesiveness with a polarizer improves, it is preferable.

Equation (X): C _ae = 1/∑(W _N /N _ae )

In the formula (X), W _N is the mass fraction of the active energy ray-curable compound N in the adhesive, and N _ae is the acrylic equivalent of the active energy ray-curable compound N. Moreover, in this invention, when the acrylic equivalent of an active energy ray hardening-type adhesive agent is predetermined or more, the reason that the adhesive force of the adhesive bond layer obtained becomes high can be estimated as follows.

As the acrylic equivalent of the active energy ray-curable adhesive rises, there is an effect of suppressing the volumetric shrinkage caused by covalent bond formation when the adhesive is irradiated with active energy ray to cure. Thereby, the stress accumulated at the interface between the adhesive layer and the adherend can be relieved, and as a result, the adhesive force of the adhesive layer is improved.

As for the said acrylic equivalent _Cae , it is more preferable that it is 155 or more, and it is still more preferable that it is 165 or more. In addition, in this invention, an acrylic equivalent is defined as follows.

(Acrylic equivalent) = (Molecular weight of acrylic monomer) / (Number of (meth)acryloyl groups contained in one molecule of acrylic monomer)

The active energy ray-curable adhesive may contain, in addition to the active energy ray-curable compounds (A), (B) and (C) as a curable component, the acrylic oligomer (D) formed by superposing|polymerizing a (meth)acryl monomer. By containing component (D) in an active energy ray-curable adhesive agent, the volume contraction at the time of making the said adhesive agent irradiate and harden an active energy ray is reduced, and interfacial stress between an adhesive bond layer and to-be-adhered bodies, such as a polarizer and a transparent protective film. can be reduced. As a result, the fall of the adhesiveness of an adhesive bond layer and to-be-adhered body can be suppressed. In order to sufficiently suppress cure shrinkage of the cured product layer (adhesive layer), the content of the acrylic oligomer (D) in the adhesive is preferably 3.0 wt% or more, and more preferably 5.0 wt% or more. On the other hand, when there is too much content of the acryl-type oligomer (D) in an adhesive agent, the fall of the reaction rate at the time of irradiating an active energy ray to the said adhesive agent may become severe, and hardening may become poor. Therefore, it is preferable that it is 25 weight% or less, and, as for content of the acrylic oligomer (D) in an adhesive agent, it is more preferable that it is 15 weight% or less.

Since the active energy ray-curable adhesive preferably has a low viscosity in consideration of workability and uniformity during coating, the acrylic oligomer (D) formed by polymerizing a (meth)acrylic monomer also preferably has a low viscosity. As an acryl-type oligomer which is low-viscosity and can prevent cure shrinkage of an adhesive bond layer, it is preferable that a weight average molecular weight (Mw) is 15000 or less, It is more preferable that it is 10000 or less, It is especially preferable that it is 5000 or less. On the other hand, in order to sufficiently suppress cure shrinkage of the cured product layer (adhesive layer), the weight average molecular weight (Mw) of the acrylic oligomer (D) is preferably 500 or more, more preferably 1000 or more, and particularly preferably 1500 or more. . Specifically, as a (meth)acrylic monomer constituting the acrylic oligomer (D), for example, methyl (meth)acrylate, ethyl (meth)acrylate, N-propyl (meth)acrylate, isopropyl (meth) ) acrylate, 2-methyl-2-nitropropyl (meth) acrylate, N-butyl (meth) acrylate, isobutyl (meth) acrylate, S-butyl (meth) acrylate, T-butyl (meth) Acrylate, N-pentyl (meth) acrylate, T-pentyl (meth) acrylate, 3-pentyl (meth) acrylate, 2,2-dimethylbutyl (meth) acrylate, N-hexyl (meth) acrylate , cetyl (meth) acrylate, N-octyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, 4-methyl-2-propylpentyl (meth) acrylate, N-octadecyl (meth) acrylate (meth)acrylic acid (C 1-20) alkyl esters such as, for example, cycloalkyl (meth) acrylate (eg, cyclohexyl (meth) acrylate, cyclopentyl (meth) acrylate, etc.) ), aralkyl (meth) acrylate (eg, benzyl (meth) acrylate, etc.), polycyclic (meth) acrylate (eg, 2-isobornyl (meth) acrylate, 2-norbor Nylmethyl (meth)acrylate, 5-norbornen-2-yl-methyl (meth)acrylate, 3-methyl-2-norbornylmethyl (meth)acrylate, etc.), hydroxyl group-containing (meth) Acrylic acid esters (for example, hydroxyethyl (meth) acrylate, 2-hydroxypropyl (meth) acrylate, 2,3-dihydroxypropylmethyl-butyl (meth) methacrylate, etc.), an alkoxy group or phenoxy group-containing (meth)acrylic acid esters (2-methoxyethyl (meth)acrylate, 2-ethoxyethyl (meth)acrylate, 2-methoxyethyl (meth)acrylate, 3-methoxybutyl ( Meth) acrylate, ethyl carbitol (meth) acrylate, phenoxyethyl (meth) acrylate, etc.), epoxy group-containing (meth) acrylic acid esters (eg, glycidyl (meth) acrylate, etc.), halogen containing (meth)acrylic acid esters (eg, 2,2,2-trifluoroethyl (meth)acrylate, 2,2, 2-trifluoroethylethyl (meth) acrylate, tetrafluoropropyl (meth) acrylate, hexafluoropropyl (meth) acrylate, octafluoropentyl (meth) acrylate, heptadecafluorodecyl (meth) ) acrylate), and alkylaminoalkyl (meth)acrylates (eg, dimethylaminoethyl (meth)acrylate). These (meth)acrylates can be used individually or in combination of 2 or more types. As a specific example of the said acrylic oligomer (D), the "ARUFON" by the Toa Synthesis company, "Actflow" by the Soken Chemical company, "JONCRYL" by the BASF Japan company, etc. are mentioned.

It is preferable that an active energy ray hardening-type adhesive agent contains the radical polymerization initiator (E) with a hydrogen extraction action. According to this structure, especially even in a high humidity environment or a non-dry state, the adhesiveness to a to-be-adhered body improves remarkably. Although this reason is not clear, the following causes are considered. When a radical polymerization initiator (E) having a hydrogen extraction action is present in the active energy ray-curable adhesive, the active energy ray-curable compound is polymerized to form a base polymer constituting the adhesive layer, for example, an active energy ray-curable compound Hydrogen is extracted from a methylene group, etc., and a radical generate|occur|produces. And the hydroxyl group of polarizer, such as PVA, reacts with the methylene group etc. which the radical generate|occur|produced, and a covalent bond is formed between an adhesive bond layer and a polarizer. As a result, it is estimated that the adhesiveness of an adhesive bond layer improves remarkably especially even in a non-dry state.

In this invention, as a radical polymerization initiator (E) which has a hydrogen-drawing effect|action, a thioxanthone type radical polymerization initiator, a benzophenone type radical polymerization initiator, etc. are mentioned, for example. As a thioxanthone-type radical polymerization initiator, the compound represented, for example by the following general formula (1) is mentioned.

[Formula 1]

In the formula, R ³ and R ⁴ represent -H, -CH ₂ CH ₃ , -iPr or Cl, and R ³ and R ⁴ may be the same or different.

When the compound represented by General formula (1) is used, it is excellent in adhesiveness compared with the case where a highly sensitive photoinitiator is used independently with respect to light of 380 nm or more. A photoinitiator highly sensitive to light of 380 nm or more will be described later. Among the compounds represented by the general formula (1), diethylthioxanthone in which R ³ and R ⁴ are —CH ₂ CH ₃ is particularly preferable.

Since the photoinitiator of General formula (1) can start superposition|polymerization by the long-wavelength light which permeate|transmits the transparent protective film which has UV absorption ability, it can harden an adhesive agent beyond a UV absorptive film. Specifically, for example, even when a transparent protective film having UV absorption ability is laminated on both sides, such as triacetyl cellulose - polarizer - triacetyl cellulose, when the photopolymerization initiator of general formula (1) is contained, the adhesive hardening is possible.

The composition ratio of the radical polymerization initiator (E) having a hydrogen extraction action in the adhesive, particularly the composition ratio of the compound represented by the general formula (1), is preferably 0.1 to 10% by weight when the total amount of the adhesive is 100% by weight. And, it is more preferable that it is 0.2 to 5 weight%.

Moreover, it is preferable to add a polymerization initiation adjuvant as needed. Examples of the polymerization initiation auxiliary agent include triethylamine, diethylamine, N-methyldiethanolamine, ethanolamine, 4-dimethylaminobenzoic acid, methyl 4-dimethylaminobenzoate, ethyl 4-dimethylaminobenzoate, and 4-dimethylaminobenzoic acid. Soamil etc. are mentioned, 4-dimethylamino ethyl benzoate is especially preferable. When a polymerization initiation aid is used, the amount added is usually 0 to 5% by weight, preferably 0 to 4% by weight, and most preferably 0 to 3% by weight when the total amount of the adhesive is 100% by weight. .

Moreover, a well-known photoinitiator can be used together as needed. Since the transparent protective film having UV absorbing ability does not transmit light of 380 nm or less, it is preferable to use a photopolymerization initiator with high sensitivity to light of 380 nm or more as the photoinitiator. Specifically, 2-methyl-1-(4-methylthiophenyl)-2-morpholinopropan-1-one, 2-benzyl-2-dimethylamino-1-(4-morpholinophenyl)-buta Non-1,2-(dimethylamino)-2-[(4-methylphenyl)methyl]-1-[4-(4-morpholinyl)phenyl]-1-butanone, 2,4,6-trimethylbenzoyl -diphenyl-phosphine oxide, bis(2,4,6-trimethylbenzoyl)-phenylphosphine oxide, bis(H5-2,4-cyclopentadien-1-yl)-bis(2,6-difluoro and rho-3-(1H-pyrrol-1-yl)-phenyl) titanium.

In particular, as a photoinitiator, in addition to the photoinitiator of General formula (1), it is preferable to contain the compound further represented by following General formula (2).

[Formula 2]

In the formula, R ⁵ , R ⁶ and R ⁷ represent -H, -CH ₃ , -CH ₂ CH ₃ , -iPr or Cl, and R ⁵ , R ⁶ and R ⁷ may be the same or different.

By using together the photoinitiator of the said General formula (1) and General formula (2), reaction efficiency improves by these photosensitization reaction, and the adhesiveness of an adhesive bond layer improves especially.

The said active energy ray hardening-type adhesive agent WHEREIN: It is preferable to contain the active energy ray hardening-type compound which has an active methylene group with the radical polymerization initiator (E) which has a hydrogen extraction effect|action further. According to this structure, the adhesiveness of an adhesive bond layer improves further.

The active energy ray-curable compound which has an active methylene group is a compound which has active double bond groups, such as a (meth)acryl group, in a terminal or a molecule|numerator, and has an active methylene group. Examples of the active methylene group include an acetacetyl group, an alkoxymalonyl group, or a cyanoacetyl group. Specific examples of the active energy ray-curable compound having an active methylene group include, for example, 2-acetacetoxyethyl (meth) acrylate, 2-acetacetoxypropyl (meth) acrylate, 2-acetacetoxy-1- Acetacetoxyalkyl (meth)acrylates, such as methylethyl (meth)acrylate; 2-ethoxymalonyloxyethyl (meth)acrylate, 2-cyanoacetoxyethyl (meth)acrylate, N-(2-cyanoacetoxyethyl)acrylamide, N-(2-propionylacetoxy) butyl) acrylamide, N-(4-acetacetoxymethylbenzyl)acrylamide, N-(2-acetacetylaminoethyl)acrylamide, etc. are mentioned. In addition, the SP value of the active energy ray-curable compound which has an active methylene group is not specifically limited, The compound of arbitrary values can be used.

On the exit side of the coating roll 641 of each adhesive agent coating part 64 of the 1st protective film 12 and the 2nd protective film 13, temperature measuring means 681, 681 is arrange|positioned, respectively. The temperature measuring means 681 is arrange|positioned in the vicinity of the coating roll 641. The temperature measuring means 681 measures the temperature of the 1st protective film 12 and the 2nd protective film 13 to which the adhesive agent was applied. Hereinafter, the 1st protective film 12 and the 2nd protective film 13 may be generically called and simply called a "protective film" in some cases.

As the temperature measuring means 681, a thermography camera, a radiation thermometer, etc. can be used, for example. The said thermography camera detects infrared rays radiated|emitted from the protective film to which the adhesive agent was applied with an infrared camera, analyzes the image which shows the detected infrared rays, and can calculate the temperature. A radiation thermometer measures the intensity|strength of infrared rays or visible light radiated from the protective film to which the adhesive agent was coated, and can measure the temperature.

The temperature measuring means 681 may measure the temperature of the protective film from the surface side to which the adhesive agent was coated, or may measure the temperature of the protective film from the side opposite to the surface to which the adhesive agent was coated. In the example of illustration, the temperature measuring means 681 is arrange|positioned on the surface side (adhesive agent layer side) to which the adhesive agent was coated. In this case, the temperature measuring means 681 measures the temperature of the adhesive bond layer strictly speaking. However, since the adhesive layer is directly formed on one side of the protective film, the temperature of the adhesive layer and the temperature of the protective film are substantially the same, and it can be said that the temperature measuring means 681 is measuring the temperature of the protective film.

Moreover, the cooling means 66 is equipped on the conveyance path|route of a protective film (1st protective film 12 and 2nd protective film 13).

The cooling means 66 lowers|hangs the room temperature in the chamber 69, and lowers|hangs the temperature of a protective film. Examples of the cooling means 66 include a cooler that sends out cold air, a heat exchanger that circulates a refrigerant body in a pipe, and the like. The cooling means 66 should just be provided in the chamber 69, and the position is not specifically limited. In the illustrated example, a cooler is used as the cooling means 66 . The cooler (cooling means 66) is arrange|positioned so that the cold air from the cooler may match|combine with a protective film. In the example of illustration, the cooling means 66 is arrange|positioned between the adhesive agent coating part 64 and the bonding part 67 so that it may blow a cold air to the 1st protective film 12 and the 2nd protective film 13, have.

The bonding part 67 bonds the protective film to which the adhesive agent was coated, and the polarizer 1c.

The bonding part 67 has nip rolls 671 and 671.

The protective film (the 1st protective film 12 and the 2nd protective film 13) and the polarizer 1c with an adhesive bond layer are penetrated by the nip rolls 671 and 671, and are pressed. On the exit side of the nip rolls 671 and 671, a laminate 1d composed of a first protective film 12/uncured adhesive layer/polarizer 1c/uncured adhesive layer/second protective film 13 ) is returned.

On the exit side of the nip roll 671 of the bonding part 67, the temperature measuring means 682 is arrange|positioned. The temperature measuring means 682 measures the temperature of the protective film bonded to the polarizer 1c through an adhesive bond layer.

As the temperature measuring means 682, a thermography camera, a radiation thermometer, etc. can be used, for example. The temperature measuring means 682 may measure the temperature from the 1st protective film 12 side, or may measure the temperature from the 2nd protective film 13 . In the example of illustration, the temperature measuring means 682 is arrange|positioned at the 1st protective film 12 side.

Moreover, you may provide a cooling means also in the exit side of the nip roll 671 as needed (not shown).

The outside of the said adhesive agent coating part 64 and the bonding part 67 is surrounded by the chamber 69. As shown in FIG. In other words, in the chamber 69, the bonding part 67 containing the adhesive agent coating part 64 containing the temperature measuring means 681 and the cooling means 66, and the temperature measuring means 682 is arrange|positioned. Further, slit-shaped inlets and outlets are formed on the upstream and downstream sides of the chamber 69 (not shown). The polarizer 1c enters the chamber 69 from an inlet on the upstream side of the chamber 69 . In the bonding part 67, the said laminated body 1d is formed, and this laminated body 1d is conveyed outside the chamber 69 from the slit-shaped exit of the chamber 69.

In addition, in the example shown, the 2nd roll part 62 around which the 1st protective film 12 was wound, and the 3rd roll part 63 around which the 2nd protective film 13 was wound are arrange|positioned outside the chamber 69, However, the 2nd roll part 62 and the 3rd roll part 63 may also be arrange|positioned in the chamber 69 (not shown).

When an active energy ray hardening-type adhesive agent is used as an adhesive agent, the hardening apparatus 7 is arrange|positioned at the downstream of the bonding part 67.

The curing apparatus 7 includes an irradiation apparatus 71 that irradiates an active energy ray to the laminate 1d. The hardening apparatus 7 may have the chamber 72 as needed. In the case of having the chamber 72 , the irradiation device 71 is disposed in the chamber 72 .

The active energy ray of the irradiation apparatus 71 is suitably selected according to sclerosis|hardenability of an active energy ray hardening-type adhesive agent. For example, the irradiation apparatus 71 which can irradiate visible light of 380 nm - 450 nm can be used.

Moreover, as shown in FIG. 4, the hardening apparatus 7 which irradiates an active energy ray is respectively arrange|positioned on the both surfaces side of the laminated body 1d, and each irradiates an active energy ray from both surfaces of the laminated body 1d. It is desirable to be able to

The two irradiation apparatuses 71 and 71 arranged on the both surfaces side may be arranged to face each other with the laminate 1d interposed therebetween, or one irradiation apparatus 71 is arranged on the upstream side and the other One irradiation apparatus 71 may be arrange|positioned downstream from it.

The laminated body 1d which entered the chamber 72 from the slit-shaped inlet on the upstream side of the chamber 72 is after the adhesive bond layer hardened|cured by the irradiation apparatus 71, The slit-shaped outlet on the downstream side of the chamber 72. is transferred out of the chamber 72 .

Since the irradiation apparatus 71 irradiates an activation energy ray, the vicinity of the irradiation apparatus 71 tends to become relatively high temperature. Since the chamber 72 which surrounds the irradiation apparatus 71 is formed in this point, the high temperature heat|fever of the hardening apparatus 7 becomes difficult to act on the bonding part 67. For this reason, in the bonding part 67 (and the adhesive agent coating part 64), it can prevent effectively that a protective film becomes too high temperature.

[Method for producing a polarizer and a method for producing a laminated polarizing film]

<Manufacturing process of polarizer>

With reference to FIG. 4, the unprocessed hydrophilic polymer film 1a is taken out from the 1st roll part 41, and the said hydrophilic polymer film 1a is conveyed by the conveyance part 42 to the swelling treatment tank 4A. The hydrophilic polymer film 1a swells by immersing the said hydrophilic polymer film 1a in the swelling treatment liquid, conveying the hydrophilic polymer film 1a with the guide roll 42 in the swelling treatment tank 4A. Although the temperature of the said swelling treatment liquid is not specifically limited, For example, it is 20 degreeC - 45 degreeC. Although time in particular for immersing the hydrophilic polymer film 1a in a swelling treatment liquid is not specifically limited, For example, they are 5 second - 300 second. Next, the hydrophilic polymer film 1a is dyed with a dichroic substance by immersing the hydrophilic polymer film 1a after swelling in the dyeing process liquid in the dyeing process tank 4B. Although the temperature of the said dyeing process liquid is not specifically limited, For example, they are 20 degreeC - 50 degreeC. Although the time for immersing the hydrophilic polymer film 1a in the dyeing|staining process liquid is not specifically limited, For example, they are 5 second - 300 second. By immersing the hydrophilic polymer film 1a after dyeing in the crosslinking treatment liquid in the crosslinking treatment tank 4C, the dichroic substance of the hydrophilic polymer film 1a is crosslinked. Although the temperature of the said crosslinking treatment liquid is not specifically limited, For example, it is 25 degreeC or more, Preferably it is 40 degreeC - 70 degreeC. The time for immersing the hydrophilic polymer film 1a in the crosslinking treatment liquid is not particularly limited, and is, for example, 5 seconds to 800 seconds.

The hydrophilic polymer film 1a after the said crosslinking is extended|stretched, conveying with the guide roll 42 in the extending|stretching process liquid of the extending|stretching tank 4D. Although the temperature of an extending|stretching process liquid is not specifically limited, For example, it is 40 degreeC - 90 degreeC. Although a draw ratio can be set suitably according to the objective, a total draw ratio is 2 to 7 times, for example, Preferably they are 4.5 to 6.8 times. The said total draw ratio means the final draw ratio of the hydrophilic polymer film 1a. The hydrophilic polymer film 1a is washed by immersing the stretched hydrophilic polymer film 1a in the washing treatment liquid in the washing treatment tank 4E. The temperature of the said washing process liquid is 5 degreeC - 50 degreeC, for example. Washing time is 1 second - 300 second, for example.

The hydrophilic polymer film after the said washing|cleaning becomes the polarizer 1b. The obtained polarizer 1b is conveyed to the drying apparatus 5 successively.

<Drying process>

Since a comparatively large amount of water|moisture content is contained in the polarizer 1b obtained by the said wet process, this is dried with the drying apparatus 5. As shown in FIG.

As for the drying temperature in the drying process, the temperature of the space 53 of the chamber 52 (atmospheric temperature in the chamber 52) is, for example, 40°C to 100°C, preferably 50°C to 90°C. is set Moreover, in the case of the drying apparatus 5 using warm air as mentioned above, the wind speed of a warm air is 1 m/sec - 30 m/sec, for example, Preferably it is set to 2 m/sec - 20 m/sec. .

<Adhesive coating process>

The elongate belt-shaped polarizer 1c after the said drying is conveyed by the conveyance part 61 to the pasting part 67. As shown in FIG. If necessary, an easily bonding composition may be coated on both surfaces of the polarizer 1c after drying using adhesive coating parts (not shown), such as a gravure roll, to form an easily bonding layer. By providing an easily bonding layer, the adhesiveness of the protective film with respect to a polarizer improves. Examples of the composition for easy adhesion include a compound having a (meth)acryloyl group, an acid anhydride group-containing silane coupling agent, an acetacetyl group-containing silane coupling agent, an isocyanuric group-containing silane coupling agent, and a carboxyl group-containing polymer. The thickness of an easily bonding layer is not specifically limited, For example, they are 0.1 micrometer - 5 micrometers.

On the other hand, the elongate strip|belt-shaped 1st protective film 12 is taken out from the 2nd roll part 62, and it is conveyed by the conveyance part 61 to the pasting part 67. Similarly, the long strip|belt-shaped 2nd protective film 13 is taken out from the 3rd roll part 63, and it is conveyed by the conveyance part 61 to the pasting part 67. In each conveying process, on one side of the first protective film 12 and one side of the second protective film 13, an active energy ray is applied to the coating roll 641 (eg gravure roll) of the adhesive coating part 64 . Adhesives, such as a hardening adhesive, are respectively coated. By coating an adhesive agent, an adhesive bond layer is formed in the single side|surface of the 1st protective film 12, and the single side|surface of the 2nd protective film 13, respectively.

Although the thickness of the adhesive agent coated on a protective film is not specifically limited, When too small, adhesive strength will fall, and when too big|large, the thickness of a laminated polarizing film will become large relatively too much. From such a viewpoint, it is preferable that the thickness (coating thickness of an adhesive agent layer) of the adhesive agent coated on the protective film (1st protective film 12 and 2nd protective film 13) is 0.1 micrometer - 5 micrometers.

Moreover, although the viscosity of the adhesive agent at the time of coating is not specifically limited, When it is too small or large, there exists a possibility of generating the coating unevenness of an adhesive agent. From such a viewpoint, the adhesive having a viscosity at 25°C preferably adjusted to 10 mPa·s to 50 mPa·s, and a viscosity at 25°C adjusted to 15 mPa·s to 45 mPa·s more preferably. In addition, the said viscosity can be measured using a viscometer at 25 degreeC.

In addition, each conveyance speed (line speed) of the polarizer 1c, the 1st protective film 12, and the 2nd protective film 13 at the time of coating is not specifically limited, When it is too fast, there is a possibility that adhesion nonuniformity may occur, , when it is too slow, the productive efficiency of a laminated polarizing film will fall. From such a viewpoint, 15 m/min - 40 m/min are preferable, and, as for the conveyance speed of protective films, etc. at the time of coating, 20 m/min - 35 m/min are more preferable.

The temperature of the protective film (protective film after coating an adhesive agent) in the exit side of the said coating roll 641 becomes in the range of 20 degreeC - 35 degreeC. As described above, the temperature of the protective film is monitored by the temperature measuring means 681 provided on the exit side of the coating roll 641 . The protective film is cooled by the cooling means 66 so that the temperature of the protective film may be in the range of 20°C to 35°C. For example, when the temperature of a protective film has risen by the measurement of the temperature measuring means 681, a control apparatus (control program) raises cooling by the cooling means 66. FIG. When the temperature of the protective film is falling by the measurement of the temperature measuring means 681 , the control device reduces or stops cooling by the cooling means 66 . Thus, by controlling the cooling means 66 according to the temperature measuring means 681, the temperature of the protective film in the exit side of the coating roll 641 is maintained in the range of 20 degreeC - 35 degreeC.

The temperature of the protective film in the exit side of the said coating roll 641 is measured by the temperature measuring means 681 within 5 second after coming out from the coating roll 641, for example. By measuring within 5 seconds, the temperature of the protective film immediately after coating an adhesive agent can be measured. By setting the position which provides the temperature measuring means 681 in consideration of the conveyance speed of a protective film, the temperature of the protective film within 5 second after coming out from the coating roll 641 can be measured.

<Lamination process>

The protective film (1st protective film 12 and 2nd protective film 13) in which the said adhesive bond layer (unhardened adhesive agent) was formed is conveyed by the bonding part 67 together with the polarizer 1c. While making the polarizer 1c and the adhesive bond layer formed in the 1st protective film 12 face each other, and also facing the adhesive bond layer formed in the polarizer 1c and the 2nd protective film 13, these films are nip roll 671 , 671) is inserted between them. By passing the nip rolls 671 and 671, the polarizer 1c, the protective film 12, and the 2nd protective film 13 are pasted together, and the protective film 12/non-hardened adhesive bond layer/polarizer 1c/ The laminate 1d which consists of the non-hardened adhesive bond layer/2nd protective film 13 is obtained.

It is preferable to perform bonding of the said protective film and the polarizer 1c between 2 second - 30 second, after coating an adhesive agent to the said protective film. After coating the adhesive to the protective film, if it is not bonded to the polarizer 1c for too long, there is a risk that the adhesive will penetrate the protective film too much, and the protective film is bonded to the polarizer 1c immediately after the adhesive is applied. There is a fear that the adhesive hardly penetrates into the protective film.

The temperature of the protective film (protective film of the laminated body 1d) in the exit side of the said nip roll 671 becomes in the range of 20 degreeC - 35 degreeC. As mentioned above, the temperature of the protective film of the laminated body 1d is monitored by the temperature measuring means 682 provided in the exit side of the nip roll 671. The protective film is cooled by the cooling means 66 so that the temperature of the protective film of the laminated body 1d may be in the range of 20 degreeC - 35 degreeC. For example, when the temperature of the protective film of the laminated body 1d has risen by measurement of the temperature measuring means 682, a control apparatus (control program) raises cooling by the cooling means 66. . When the temperature of the protective film of the laminated body 1d has fallen by the measurement of the temperature measuring means 682, a control apparatus reduces or stops cooling by the cooling means 66. As shown in FIG. Thus, by controlling the cooling means 66 according to the temperature measuring means 682, the temperature of the protective film in the exit side of the nip roll 671 is maintained in the range of 20 degreeC - 35 degreeC.

The temperature of the protective film in the exit side of the said nip roll 671 is measured by the temperature measuring means 682 within 5 second after coming out from the nip roll 671, for example. By measuring within 5 seconds, the temperature of the protective film immediately after bonding with the polarizer 1c can be measured. By setting the position where the temperature measuring means 682 is provided in consideration of the conveyance speed of the laminate 1d, the temperature of the protective film within 5 seconds after coming out of the nip roll 671 can be measured.

Moreover, since the adhesive agent coating part 64 and the bonding part 67 are accommodated in the chamber 69, it is preferable that the temperature in the chamber 69 is also controlled so that it may become in the range of 20 degreeC - 35 degreeC. By keeping the inside of the chamber 69 in the range of 20 degreeC - 35 degreeC, between the exit side of the said nip roll 671 for a protective film from the exit side of the coating roll 641 (from adhesive coating to bonding to a polarizer) series), and can be maintained in a temperature range of 20°C to 35°C.

<Adhesive curing process>

When an active energy ray hardening-type adhesive agent is used, by irradiating an active energy ray with respect to the said laminated body 1d with the hardening apparatus 7, an active energy ray hardening-type adhesive agent hardens, and protective film 12 / after hardening The laminated polarizing film 1e which consists of adhesive bond layer / polarizer 1c / adhesive bond layer after hardening / 2nd protective film 13 is obtained. In addition, as for the adhesive bond layer which consists of the said active energy ray hardening-type adhesive agent, the thickness before hardening (at the time of coating) and the thickness after hardening become substantially the same.

The obtained laminated polarizing film 1e is wound up by the winding-up roll part 8 (refer FIG. 4).

[Operation and Effects of the Present Invention]

According to the manufacturing method of this invention, the protective film in the exit side of the coating roll of an adhesive agent coating process becomes the range of 20 degreeC - 35 degreeC, and the protective film in the exit side of the nip roll in a lamination process is 20 It is in the range of °C - 35 °C. Preferably, the protective film between the exit side of the said coating roll to the exit side of the said nip roll is hold|maintaining in the range of 20 degreeC - 35 degreeC. For this reason, the laminated polarizing film by which a polarizer and a protective film were adhere|attached favorably through an adhesive agent can be obtained.

In particular, by using a protective film having an easy-to-adhesive surface such as a TAC film, the adhesive is favorably compatible with or penetrates the surface of the protective film, and a laminated polarizing film excellent in correlated adhesive strength can be obtained.

In detail, after coating the adhesive to the protective film, when the temperature of the protective film is too high, the adhesive is excessively impregnated into the protective film, and there is a risk that the adhesive and the protective film are used excessively. When compatibility of an adhesive agent and a protective film advances too much, the cohesive force of the adhesive agent after hardening will become inadequate, and a polarizer and a protective film cannot be firmly adhere|attached through an adhesive agent. When the protective film after coating an adhesive agent is 35 degrees C or less like this invention, it can prevent that an adhesive agent impregnates excessively with respect to a protective film.

On the other hand, after coating the adhesive to the protective film, if the temperature of the protective film is too low, the adhesive is difficult to impregnate the protective film, and there is a fear that the adhesive and the protective film are hardly compatible. If the adhesive and the protective film are hardly compatible, a good compatible layer is not formed between the adhesive layer and the protective film, and the polarizer and the protective film cannot be strongly adhered through the adhesive. As in the present invention, when the protective film is at 20°C or higher, the protective film is appropriately impregnated with the adhesive, and a good compatible layer is formed between the adhesive layer and the protective film.

Therefore, according to the manufacturing method of this invention, the laminated polarizing film by which the polarizer and the protective film were adhere|attached favorably through the adhesive agent can be obtained.

[Use of laminated polarizing film, etc.]

The laminated polarizing film of this invention is typically used as an optical film of displays, such as a liquid crystal display device and an organic display device.

Moreover, the laminated polarizing film of this invention is not limited when used for the display mentioned above, You can also use it for uses other than a display. As uses other than a display, an optical device, a building, the field|area of medical care, a food, etc. are mentioned. When a laminated polarizing film is used for an optical device, the laminated polarizing film is processed into a polarizing lens, a transparent radio wave blocking film, etc., for example. When a laminated polarizing film is used for an electronic device, the laminated polarizing film is processed into the film for light control windows etc., for example. When a laminated polarizing film is used for a medical/food field, the laminated polarizing film is processed into a photodegradation prevention film etc., for example.

Example

Hereinafter, Examples and Comparative Examples will be described, and the present invention will be described in more detail. However, the present invention is not limited to the following examples.

[Materials used]

<TAC film>

A triacetyl cellulose film (manufactured by Fuji Film Co., Ltd., trade name: TG60UL) having a thickness of 60 µm was used.

<Acrylic film with adhesive agent>

100 parts by weight of the imidized MS resin described in Production Example 1 of Japanese Patent Application Laid-Open No. 2010-284840 and 0.62 parts by weight of a triazine-based UV absorber (manufactured by ADEKA Corporation, trade name: T-712) are mixed with a twin-screw kneader at 220° C., Resin pellets were prepared. The obtained resin pellet was dried at 100.5 kPa and 100 degreeC for 12 hours, and it extruded from T-die at 270 degreeC of die temperature with a single screw extruder, and it shape|molded it into film shape (160 micrometers in thickness). Further, the molded film is stretched in an atmosphere of 150° C. in the conveying direction (thickness of 80 μm), and then an easy-adhesive agent containing an aqueous urethane resin is applied, and then 150° C. in a direction orthogonal to the film conveying direction. A transparent acrylic film having a thickness of 40 µm (water vapor permeability 58 g/m 2 /24 h) was obtained by stretching in an atmosphere of

<Active energy ray-curable adhesive A>

10 wt% of hydroxyethyl acrylamide (manufactured by KJ Chemicals, trade name: HEAA), 30 wt% of acroylmorpholine (manufactured by KJ Chemicals, trade name: ACMO), 37 wt% of tripropylene glycol diacrylate ( Toa Synthetic Co., Ltd., trade name: ARONIX M-220), 3% by weight of tetranormal butyl titanate (Matsumoto Fine Chemical, trade name: TA-21), 5% by weight of ω-carboxy-dicaprolactone monoacrylate ( Toa Synthesis, trade name: ARONIX M-5300), 10% by weight of epoxy group-modified acrylic oligomer (Toa Synthetic, trade name: ARUFON UP-1190), 3% by weight of 2-methyl-1-(4-methylthiophenyl) -2-morpholinopropan-1-one (manufactured by IGM Resins, trade name: OMNIRAD 907) and 2 wt% of 2,4-diethylthioxanthone (manufactured by Nippon Kayaku Co., Ltd., trade name: KAYACURE DETX-S) By mixing and stirring for 3 hours, the active energy ray hardening-type adhesive agent A was obtained.

The viscosity at 25 degreeC of this active energy ray hardening-type adhesive agent A was 38 mPa*s.

<Active energy ray-curable adhesive B>

47.5 wt% of acroylmorpholine (manufactured by KJ Chemicals, trade name: ACMO), 47.5 wt% of tripropylene glycol diacrylate (manufactured by Toa Synthesis, trade name: ARONIX M-220), 3 wt% of 2-methyl- 1-(4-methylthiophenyl)-2-morpholinopropan-1-one (manufactured by IGM Resins, trade name: OMNIRAD 907) and 2% by weight of 2,4-diethylthioxanthone (manufactured by Nippon Kayaku Co., Ltd.) , brand name: KAYACURE DETX-S) was mixed and the active energy ray hardening-type adhesive agent B was obtained by stirring for 3 hours.

The viscosity at 25 degreeC of this active energy ray hardening-type adhesive agent A was 16 mPa*s.

<Easily Adhesive Composition>

70% by weight of acroylmorpholine (manufactured by KJ Chemicals, trade name: ACMO), 2% by weight of 3-vinylphenylboronic acid and 28% by weight of water were mixed and stirred for 3 hours to obtain a composition for easy adhesion.

[Method for measuring viscosity]

The viscosities of active energy ray hardening-type adhesives A and B were measured at 25 degreeC using the E-type rotational viscometer (made by Toki Sangyo Co., Ltd.).

[Manufacturing equipment used]

The manufacturing apparatus (a manufacturing apparatus as shown in FIG. 4) of the laminated polarizing film which has a wet processing apparatus, a drying apparatus, a lamination apparatus, and a hardening apparatus was used. This manufacturing apparatus 2 (refer FIG. 4) is equipped with the thermography camera which is commercially available as temperature measuring means 681,682, Moreover, the cooler is equipped with the cooling means 66. As shown in FIG.

[Example 1]

The cooler was set so that the room temperature in the chamber 69 surrounding the adhesive agent coating part 64 and the bonding part 67 might be 22 degreeC.

After setting the inside of the chamber 69 to the above room temperature, a polarizer was prepared as follows, and after drying it, the first protective film and the second protective film were adhered to both sides of the polarizer to prepare a laminated polarizing film .

In Example 1, both used the TAC film as a 1st protective film and a 2nd protective film.

<Manufacturing process of polarizer>

Using the wet processing apparatus of the said manufacturing apparatus, the polyvinyl alcohol film (45 micrometers in thickness, 3000 mm in width) of average polymerization degree 2400 and saponification degree 99.9 mol% was immersed in 30 degreeC warm water for 60 second, and it was made to swell. Then, it was immersed in the aqueous solution with the density|concentration of 0.3% of iodine/potassium iodide (weight ratio =0.5/8), and the film was dye|stained, extending|stretching to 3.5 times. Then, in 65 degreeC boric-acid ester aqueous solution, after extending|stretching so that a total draw ratio might become 6 times, water washing|cleaning was carried out, and the elongate strip|belt-shaped polarizer was manufactured.

<Drying process of polarizer>

Then, this polarizer was conveyed in a drying apparatus, and it was made to dry. The wind speed of the warm air of a drying apparatus made 3 m/sec and the atmospheric temperature in a chamber about 60 degreeC, and conveyed the polarizer at the conveyance speed of 25 m/min.

<Adhesive coating process, lamination process and adhesive curing process>

Then, while conveying the polarizer after drying to the bonding part of the apparatus at a speed of 25 m/min, the active energy ray-curable adhesive A is coated on both surfaces of the polarizer in a beta phase with a gravure roll, respectively, and the adhesive having a coating thickness of 1.0 µm layer was formed. At the same time, while conveying the 1st protective film and the 2nd protective film (both TAC films) at a speed|rate of 25 m/min, on the single side|surface of a 1st protective film and the single side|surface of a 2nd protective film, respectively, with a gravure roll, an active energy ray-curable adhesive A was coated in a beta phase, and the adhesive layer with a coating thickness of 1.0 micrometer was formed. The adhesive layer of the first protective film is overlaid on the adhesive layer of one side of the polarizer, and the adhesive layer of the second protective film is superposed on the adhesive layer of the other side of the polarizer and passed through the nip roll of the bonding part 67, and the first protection A laminate of film / uncured adhesive layer / polarizer / uncured adhesive layer / second protective film is obtained, and the adhesive layer is cured by irradiating light with a wavelength of 380 nm to 450 nm from both sides of the laminate to continuously to prepare a laminated polarizing film.

The temperature of the 2nd protective film immediately after coating the adhesive agent was measured with the thermography camera arrange|positioned on the exit side of the gravure roll. The temperature was measured at a position about 2 seconds after the second protective film came out of the gravure roll.

Moreover, the temperature of the 2nd protective film of a laminated body was measured with the thermography camera arrange|positioned on the exit side of the nip roll. The temperature was measured at a position about 2 seconds after the laminate came out of the gravure roll.

Table 2 shows the temperature of the protective film immediately after adhesive coating and the temperature of the protective film immediately after formation of the laminate (the temperature of the protective film immediately after bonding).

However, the numerical value of Table 2 employ|adopted the average value for 10 second from the time point when the room temperature in the chamber 69 stabilized at the set temperature substantially after starting an apparatus.

[Example 2]

Except having set so that room temperature in the chamber 69 surrounding the adhesive agent coating part 64 and the bonding part 67 might be set to 29 degreeC, it carried out similarly to Example 1, and produced the laminated polarizing film.

Table 2 shows the temperature of the protective film immediately after the adhesive coating of Example 2 and the temperature of the protective film immediately after the formation of the laminate.

[Example 3]

While conveying the dried polarizer at a speed of 25 m/min (without application of an active energy ray-curable adhesive), the easy-to-adhesive composition is coated on both sides in a beta phase with a gravure roll, and air-dried to form an easy-to-adhesive layer with a thickness of 0.2 µm, respectively After forming, the thing conveyed to the bonding part of an apparatus, the thing using the active energy ray hardening-type adhesive agent B instead of the active energy ray-curable adhesive A, and the chamber surrounding the adhesive agent coating part 64 and the bonding part 67 ( 69) except having set so that room temperature in the inside might be set to 24 degreeC, it carried out similarly to Example 1, and produced the laminated polarizing film.

Table 2 shows the temperature of the protective film immediately after the adhesive coating of Example 3 and the temperature of the protective film immediately after the formation of the laminate.

[Example 4]

While conveying the dried polarizer at a speed of 25 m/min (without application of an active energy ray-curable adhesive), the easy-to-adhesive composition is coated on both sides in a beta phase with a gravure roll, and air-dried to form an easy-to-adhesive layer with a thickness of 0.2 µm, respectively After forming, the thing conveyed to the bonding part of an apparatus, the thing using the active energy ray hardening-type adhesive agent B instead of the active energy ray-curable adhesive A, and the chamber surrounding the adhesive agent coating part 64 and the bonding part 67 ( 69) except having set so that room temperature in the inside might be set to 27 degreeC, it carried out similarly to Example 1, and produced the laminated polarizing film.

Table 2 shows the temperature of the protective film immediately after the adhesive coating of Example 4 and the temperature of the protective film immediately after the formation of the laminate.

[Example 5]

So that the room temperature in the chamber 69 surrounding the thing using the acrylic film with an adhesive agent as both a 1st protective film and a 2nd protective film and the adhesive agent coating part 64 and the bonding part 67 is 22 degreeC Except having set, it carried out similarly to Example 1, and manufactured the laminated polarizing film. Furthermore, an active energy ray-curable adhesive was applied to the easy-to-adhesive agent side of the acrylic film (in this respect, Example 6 and Comparative Examples 4 and 5 are also the same).

Table 2 shows the temperature of the protective film immediately after the adhesive coating of Example 5 and the temperature of the protective film immediately after the formation of the laminate.

[Example 6]

So that the room temperature in the chamber 69 surrounding the thing using the acrylic film with an adhesive agent as both a 1st protective film and a 2nd protective film and the adhesive agent coating part 64 and the bonding part 67 is 28 degreeC Except having set, it carried out similarly to Example 1, and manufactured the laminated polarizing film.

Table 2 shows the temperature of the protective film immediately after the adhesive coating of Example 6 and the temperature of the protective film immediately after the formation of the laminate.

[Comparative Example 1]

Except having set so that room temperature in the chamber 69 surrounding the adhesive agent coating part 64 and the bonding part 67 might be set to 36 degreeC, it carried out similarly to Example 1, and manufactured the laminated polarizing film.

Table 3 shows the temperature of the protective film immediately after adhesive coating of Comparative Example 1 and the temperature of the protective film immediately after formation of the laminate.

[Comparative Example 2]

Except having set so that room temperature in the chamber 69 surrounding the adhesive agent coating part 64 and the bonding part 67 might be set to 18 degreeC, it carried out similarly to Example 1, and manufactured the laminated polarizing film.

Table 3 shows the temperature of the protective film immediately after the adhesive coating of Comparative Example 2 and the temperature of the protective film immediately after the formation of the laminate.

[Comparative Example 3]

While conveying the dried polarizer at a speed of 25 m/min (without application of an active energy ray-curable adhesive), the easy-to-adhesive composition is coated on both sides in a beta phase with a gravure roll, and air-dried to form an easy-to-adhesive layer with a thickness of 0.2 µm, respectively After forming, the thing conveyed to the bonding part of an apparatus, the thing using the active energy ray hardening-type adhesive agent B instead of the active energy ray-curable adhesive A, and the chamber surrounding the adhesive agent coating part 64 and the bonding part 67 ( 69) except having set so that the room temperature in the inside might be set to 37 degreeC, it carried out similarly to Example 1, and produced the laminated polarizing film.

Table 3 shows the temperature of the protective film immediately after the adhesive coating of Comparative Example 3 and the temperature of the protective film immediately after the formation of the laminate.

[Comparative Example 4]

So that the room temperature in the chamber 69 surrounding the thing using the acrylic film with an adhesive agent as both a 1st protective film and a 2nd protective film and the adhesive agent coating part 64 and the bonding part 67 is 36 degreeC Except having set, it carried out similarly to Example 1, and manufactured the laminated polarizing film.

Table 3 shows the temperature of the protective film immediately after the adhesive coating of Comparative Example 4 and the temperature of the protective film immediately after the formation of the laminate.

[Comparative Example 5]

So that the room temperature in the chamber 69 surrounding what used the acrylic film with an adhesive agent as both a 1st protective film and a 2nd protective film and the adhesive agent coating part 64 and the bonding part 67 was 17 degreeC Except having set, it carried out similarly to Example 1, and manufactured the laminated polarizing film.

Table 3 shows the temperature of the protective film immediately after the adhesive coating of Comparative Example 5 and the temperature of the protective film immediately after the formation of the laminate.

[Peel strength test]

The laminated polarizing film was cut out to a size of 15 mm in a direction orthogonal to 200 mm and it parallel to the extending|stretching direction of a polarizer, and the sample piece was manufactured. A cut was made with a cutter knife between the 1st protective film of a sample piece, and the layer of a polarizer, and the 2nd protective film side of the laminated polarizing film was bonded together to a glass plate. Using a Tensilon tester (manufactured by Shimadzu Corporation, product name: AG-1 10KN), the first protective film and the polarizer were peeled off in a 90 degree direction (speed 1000 mm/min), and the initial peel strength (N/15 mm) ) was measured. Similarly, a sample piece with a cut-out between the layers of the second protective film and the polarizer is prepared, the first protective film side is bonded to a glass plate, and in the same manner, the second protective film and the polarizer are peeled, and the initial peel strength ( N/15 mm) was measured. The results are shown in Tables 2 and 3.

"(circle)" in the evaluation column of Table 2 and Table 3 shows the case where initial stage peeling strength is 0.5 N/15 mm or more, and "x" shows the case where it is less than 0.5 N/15 mm.

1, 1e: laminated polarizing film
1c: polarizer
12, 13: protective film
2: Manufacturing apparatus of laminated polarizing film
4: Wet processing unit
5: Drying device
6: Laminate device
641: potter roll
671: nip roll
7: curing device

Claims (9)

Adhesive coating process of applying an adhesive to the protective film using a coating roll,
It has a lamination process of passing the protective film and the polarizer to which the said adhesive agent was coated, and bonding them together through a nip roll,
The said protective film in the exit side of the said coating roll of the said adhesive agent coating process becomes the range of 20 degreeC - 35 degreeC,
The manufacturing method of the laminated polarizing film in which the said protective film in the exit side of the said nip roll in the said lamination process is in the range of 20 degreeC - 35 degreeC. The method of claim 1,
The manufacturing method of the laminated polarizing film whose said protective film is a transparent film which has a surface with easy adhesion|attachment with respect to the said adhesive agent. 3. The method according to claim 1 or 2,
The manufacturing method of the laminated polarizing film whose said protective film is a triacetyl cellulose film. 4. The method according to any one of claims 1 to 3,
The manufacturing method of the laminated polarizing film whose said protective film is a film with a urethane type easy adhesion agent. 3. The method according to claim 1 or 2,
The manufacturing method of the laminated polarizing film whose said protective film is an acrylic film with a urethane type easy adhesion agent. 6. The method according to any one of claims 1 to 5,
The manufacturing method of the laminated polarizing film whose said adhesive agent is an active energy ray hardening-type adhesive agent. 7. The method according to any one of claims 1 to 6,
The manufacturing method of the laminated polarizing film which coats the said adhesive agent to the said protective film by 0.1 micrometer - 5 micrometers in thickness. 8. The method according to any one of claims 1 to 7,
After coating the said adhesive agent to the said protective film, the manufacturing method of a laminated polarizing film which bonds the said polarizer to the said protective film between 2 second - 30 second. 9. The method according to any one of claims 1 to 8,
The manufacturing method of the laminated polarizing film which hold|maintains the said protective film between the exit side of the said coating roll to the exit side of the said nip roll in the range of 20 degreeC - 35 degreeC.

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