CN106575009A - Method for manufacturing polarizing plate - Google Patents
Method for manufacturing polarizing plate Download PDFInfo
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- CN106575009A CN106575009A CN201580040169.2A CN201580040169A CN106575009A CN 106575009 A CN106575009 A CN 106575009A CN 201580040169 A CN201580040169 A CN 201580040169A CN 106575009 A CN106575009 A CN 106575009A
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- Prior art keywords
- film
- base material
- roller
- material film
- resin
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C55/00—Shaping by stretching, e.g. drawing through a die; Apparatus therefor
- B29C55/02—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
- G02B1/04—Optical elements characterised by the material of which they are made; Optical coatings for optical elements made of organic materials, e.g. plastics
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/30—Polarising elements
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
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- Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- General Physics & Mathematics (AREA)
- Nonlinear Science (AREA)
- Crystallography & Structural Chemistry (AREA)
- Chemical & Material Sciences (AREA)
- Mathematical Physics (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Polarising Elements (AREA)
- Folding Of Thin Sheet-Like Materials, Special Discharging Devices, And Others (AREA)
- Laminated Bodies (AREA)
- Shaping By String And By Release Of Stress In Plastics And The Like (AREA)
- Liquid Crystal (AREA)
Abstract
Provided is a method for manufacturing a polarizing plate. The method comprises: a step for forming a polyvinyl alcohol-based resin layer on at least one surface of a substrate film to give a laminated film; a step for stretching the laminated film; a step for dyeing the polyvinyl alcohol-based resin layer with a dichroic dye to give a polarizer layer; a step for bonding a protective film to the surface on the opposite side to the substrate film side to give a multilayered film; and a step for peeling off the substrate film from the multilayered film to give a polarizing plate, wherein the step for peeling off the substrate film is carried out in a state where the multilayered film is wound on a roll on the opposite side to the substrate film and, when the substrate film is peeled off from the multilayered film, the surface of the multilayered film on the opposite side to the substrate film is continuously in contact with the roll at a peeling point thereof.
Description
Technical field
The present invention relates to polarizer layer at least one side be fitted with protecting film polarization plates manufacture method.
Background technology
Polarization plates are widely used in image display device with liquid crystal indicator as representative etc..As polarization plates,
Usually the polarizer layer being made up of polyvinyl alcohol resin one or both sides laminating protecting film composition polarization plates.Closely
Nian Lai, with expansion of the image display device in mobile device, slim TV machines etc., gradually requires polarization plates, enters but be inclined
Shake the filming of lamella.
As the manufacture method of the polarization plates of the polarizer layer for possessing thin film, be known to following method, i.e. to by
It is coated with the stacked film for forming polyvinyl alcohol resin layer containing the coating fluid of polyvinyl alcohol resin to be stretched on base material film
Afterwards, implement to process the dyeing of polyvinyl alcohol resin layer absorption dichroism pigment, produce and polarization is formed with base material film
The polarizability stacked film of lamella, then, is fitted protecting film in polarizer layer and makes multilamellar with the face of base material film opposite side
After film, peel off and remove base material film (such as Japanese Unexamined Patent Publication 2000-338329 publications (patent documentation 1) and International Publication No.
No. 2013/018845 (patent documentation 2)).
According to above-mentioned method, due to forming polyvinyl alcohol resin layer using coating, thus with by polyethenol series tree
The filming of monolayer (monomer) film that fat is constituted is compared, and the filming of polyvinyl alcohol resin layer is easy, thus polarizer layer
Filming also becomes easy.Further, since the polyvinyl alcohol resin layer and polarizer layer of thin film in manufacturing process always by
Any one film is supported, therefore the disposal of the film in manufacturing process is also excellent.
Prior art literature
Patent documentation
Patent documentation 1：Japanese Unexamined Patent Publication 2000-338329 publications
Patent documentation 2：International Publication No. 2013/018845
The content of the invention
Invent problem to be solved
When profit manufactures polarization plates with the aforedescribed process, in order to prevent the polyethenol series in stretching process, dyeing process
Resin bed from base material film peel off, or produce float (because local produce peel off and between base material film and polyvinyl alcohol resin layer
Produce the phenomenon in gap), need to make base material film closely sealed securely with polyvinyl alcohol resin layer.But in this case, by base
When material film peels off peeling base film in the operation for removing, easily cause and cohesion destruction, polarizer layer are produced in polarizer layer
There is the not good situation of albefaction in release surface.
For not good situation as above, it is possible to use the method described in patent documentation 2 effectively suppresses, i.e. will
The peeling direction of base material film is set as specific angle with the differently- oriented directivity angulation of polarizer layer, preferably again in base material film
Pick-up point, make multilayer film less with base material film angulation than multilayer film with polarization plates angulation.But, be in dimension
Hold these with regard to angle condition while continuously peeling base film, especially in the situation that polarizer layer or protecting film are thin
Under, may not be easily able to.
Thus it is an object of the present invention to provide a kind of manufacture method of new polarization plates, even if by base material film and poly- second
The closing force of enol resin brings up to the degree for being resistant to stretching process and dyeing process, it is also possible to suppress it is above-mentioned not
Good situation and neatly peel off removing base material film.
For the method for solve problem
The present invention provides the manufacture method of polarization plates shown below.
[1] a kind of manufacture method of polarization plates, including：
Resin bed formation process, forms polyvinyl alcohol resin layer at least one side of base material film and obtains stacked film；
Stretching process, is stretched to the stacked film and is obtained stretched film；
Dyeing process, the polyvinyl alcohol resin layer of the stretched film is dyeed with dichroism pigment and polaroid is formed
Layer, thus obtains polarizability stacked film；
Bonding process, fits protecting film in the face of the face opposite side with base material film side of the polarizability stacked film and obtains
To multilayer film；With
Stripping process, peels off from the multilayer film and removes base material film and obtain polarization plates,
The stripping process be by the multilayer film with its with base material film opposite side on roller in the state of enter
OK, and when the base material film is peeled off from the multilayer film, with keep the multilayer film at its pick-up point and base material film
The mode of the state that the face of opposite side is contacted with the roller is carried out.
[2] manufacture method according to described in [1], wherein, the tension force of the base material film after by stripping is set to A, will peel off
When the tension force of the multilayer film before base material film is set to B, the peeling base film under conditions of B >=10 × A is met.
[3] according to the manufacture method described in [1], wherein, the roller is vacuum furnace, using vacuum furnace aspirate wound on
Peeling base film while multilayer film on roller.
[4] manufacture method recorded according to any one of [1]～[3], wherein, a diameter of more than 200mm of the roller.
[5] manufacture method recorded according to any one of [1]～[4], wherein, the thickness of the polarizer layer be 10 μm with
Under.
[6] manufacture method recorded according to any one of [1]～[5], wherein, the thickness of the protecting film be 35 μm with
Under.
Invention effect
According to the present invention it is possible to suppress the cohesion of issuable polarizer layer in the stripping removal step of base material film to break
The not good situation of the albefaction of bad, polarizer layer release surface etc, improves the exterior quality of the polarization plates of gained.
Description of the drawings
Fig. 1 is the flow chart of the manufacture method of the polarization plates for representing the present invention.
Fig. 2 be represent resin bed formation process in constitute one of the layer of stacked film that obtains constructed profile.
Fig. 3 be represent stretching process in constitute one of the layer of stretched film that obtains constructed profile.
Fig. 4 be represent dyeing process in constitute one of the layer of polarizability stacked film that obtains constructed profile.
Fig. 5 be represent the first bonding process in constitute one of the layer of multilayer film that obtains constructed profile.
Fig. 6 be represent stripping process in the signal of constitute one of layer of the polarization plates of the one side that obtains with protecting film cut open
Face figure.
Fig. 7 is the diagrammatic side view of the stripping means of the base material film for representing the present invention.
Fig. 8 be represent the second bonding process in the layer of the two-sided polarization plates with protecting film that obtains constitute one show
Meaning profile.
Specific embodiment
As shown in figure 1, the manufacture method of the polarization plates of the present invention includes following operations successively：
Resin bed formation process S10, forms polyvinyl alcohol resin layer at least one side of base material film and obtains stacked film；
Stretching process S20, is stretched to stacked film and is obtained stretched film；
Dyeing process S30, the polyvinyl alcohol resin layer of stretched film is dyeed with dichroism pigment and polarizer layer is formed,
Thus obtain polarizability stacked film；
First bonding process S40, the face of the face opposite side with base material film side of polarizability stacked film fit first protect
Cuticula and obtain multilayer film；With
Stripping process S50, peels off from multilayer film and removes base material film and obtain polarization plates (polarization of the one side with protecting film
Plate).
As described later, the manufacture method of polarization plates of the invention can also include the second bonding process S60, carry in one side
Fit the second protecting film on the polarizer layer of the polarization plates of protecting film and obtain the two-sided polarization plates with protecting film.Hereinafter, exist
While referring to the drawings, each operation is described in detail.
(1) resin bed formation process S10
With reference to Fig. 2, this operation is to obtain stacked film at least one side formation polyvinyl alcohol resin layer 6 of base material film 30
100 operation.The polyvinyl alcohol resin layer 6 is stretched and dyes and be changed into the layer of polarizer layer 5 (Fig. 4).Polyethylene
Alcohol resin 6 can be by by the coating solution containing polyvinyl alcohol resin is in the one or both sides of base material film 30 and makes
Drying and formed.The method of polyvinyl alcohol resin layer 6 is formed from the polaroid for being readily available thin film using this kind of coating
It is favourable from the aspect of layer 5.Resin bed formation process S10 in the typical case, is from the base material film 30 as long size
The film roll cylinder of winding product continuously roll out base material film 30, and continuously carry out while transport to which.Can use and lead
Roller etc. is carrying out film transport.
(base material film)
Base material film 30 can be made up of thermoplastic resin, wherein it is preferred that by the transparency, mechanical strength, heat stability, stretching
Property etc. excellent thermoplastic resin constitute.The concrete example of this kind of thermoplastic resin for example includes chain polyolefin-based resins, ring-type
The polyolefin-based resins of polyolefin-based resins (norbornene resin etc.) etc；Polyester based resin；(methyl) acrylic acid seriess tree
Fat；The cellulose esters system resin of cellulosic triacetate, cellulose diacetate etc；Polycarbonate-based resin；Polyvinyl alcohol
It is resin；Polyvinyl acetate system resin；Polyarylate system resin；Polystyrene resin；Polyether sulfone system resin；Polysulfones system tree
Fat；Polyamide series resin；Polyimides system resins；And their mixture, copolymer etc..
" (methyl) acrylic acid " so-called in this specification, refers at least one party in acrylic acid and methacrylic acid.
It is also identical for when mentioning " (methyl) acryloyl group " etc..
Base material film 30 can be the single layer structure being made up of 1 resin bed comprising one kind or two or more thermoplastic resin,
It can also be multiple structure obtained by the multiple resin beds comprising one kind or two or more thermoplastic resin of stacking.Base material film 30 is preferred
It is made up of following resin, i.e. when stretching stacked film 100 in stretching process S20 described later, stretching polyethylene can be suitable to
The draft temperature of alcohol resin 6 is stretched.
As chain polyolefin-based resins, the chain olefin except polyvinyl resin, acrylic resin etc can be enumerated
Homopolymer beyond, the copolymer being made up of chain olefin of more than two kinds can also be enumerated.It is made up of chain polyolefin-based resins
Base material film 30 from from the aspect of the stretching of readily and stably high magnification preferably.Wherein, base material film 30 is more preferably by polypropylene-based
Resin (acrylic resin as the homopolymer of propylene, the copolymer based on propylene), polyethylene-based resin are (as ethylene
The polyvinyl resin of homopolymer, the copolymer based on ethylene) etc. constitute.
As the copolymer based on propylene of one of the example of thermoplastic resin for being suitable for use as composition base material film 30
It is the copolymer of propylene and other monomers that can be copolymerized therewith.
As ethylene, alpha-olefin for example can be enumerated with the other monomers of propylene copolymerization.It is as alpha-olefin, excellent
Alpha-olefin of the choosing using carbon number more than 4, the more preferably alpha-olefin of carbon number 4～10.Carbon number 4～10
The concrete example of alpha-olefin for example includes 1-butylene, 1- amylenes, 1- hexenes, 1- heptene, 1- octenes, 1-decene etc
Straight-chain monoene hydro carbons；The branched of 3-methyl-1-butene, 3- Methyl-1-pentenes, 4-methyl-1-pentene etc
Monoene hydro carbons；Vinyl cyclohexane etc..Propylene can be random copolymer with the copolymer of other monomers that can be copolymerized therewith,
It can also be block copolymer.
The content of above-mentioned other monomers in the copolymer be, for example, 0.1～20 weight %, preferably 0.5～10 weight %.
The content of the other monomers in copolymer can by according to《Macromolecule analyzes handbook》(nineteen ninety-five, the distribution of Kinokuniya bookstore)
Page 616 described in method, carry out infrared ray (IR) spectroscopic assay to obtain.
Above-mentioned central, as polypropylene-based resin, homopolymer, the propylene-ethylene random copolymerization of propylene are preferably used
Thing, propylene -1-butylene random copolymer or propylene-ethylene -1-butylene random copolymer.
The stereoregularity of polypropylene-based resin is preferably essentially isotaxy or syndiotactic.Comprising substantially having
The disposal of the base material film 30 of the polypropylene-based resin of isotaxy or syndiotactic stereoregularity is more good, and high
Mechanical strength under warm environment.
Cyclic polyolefin hydrocarbon system resin is the general name of the resin being polymerized as polymerized unit using cyclic olefin, for example, can enumerate
Japanese Unexamined Patent Publication 1-240517 publication, Japanese Unexamined Patent Publication 3-14882 publication, Japanese Unexamined Patent Publication 3-122137 publication
Resin Deng described in.If enumerating the concrete example of cyclic polyolefin hydrocarbon system resin, for the open loop (co) polymer of cyclic olefin,
The copolymer of the chain olefin of the addition polymer of cyclic olefin, cyclic olefin and ethylene, propylene etc is (in the case of representational
Random copolymer), and graft polymers that they have been modified with unsaturated carboxylic acid or derivatives thereof and their hydrogen
Compound.Wherein, it is preferably used as the norborneol that cyclic olefin has used norborene or condensed ring norborneol alkene monomer etc
The norbornene resin of alkene monomer.
Polyester based resin is the resin with ester bond, generally by the condensation polymer of polybasic carboxylic acid or derivatives thereof and polyhydric alcohol
The resin of composition.2 yuan dicarboxylic acids or derivatives thereof can be used as polybasic carboxylic acid or derivatives thereof, it is right for example to enumerate
Phthalic acid, M-phthalic acid, dimethyl terephthalate (DMT), naphthalene diformic acid dimethyl ester.The two of 2 yuan can be used as polyhydric alcohol
Alcohol, for example, can enumerate ethylene glycol, Propylene Glycol, butanediol, neopentyl glycol, cyclohexanedimethanol.
As the typical example of polyester based resin, can enumerate poly- to benzene with the condensation polymer of ethylene glycol as p-phthalic acid
Naphthalate.Polyethylene terephthalate is crystalline resin, but carries out the state of crystallization before processing
Resin easily implement stretching etc. and process.It is possible if desired to be crystallized using heat treatment during stretching or after stretching etc.
Change is processed.Alternatively, it is also possible to suitably use by other species of copolymerization again on the skeleton of polyethylene terephthalate
Monomer and reduce crystalline (or making non-crystalline) copolyester.As the example of this kind of resin, for example can be with
Enumerate make cyclohexanedimethanol or M-phthalic acid it is copolymerized therewith obtained by resin.Due to the draftability of these resins it is also excellent,
Therefore suitably can use.
If enumerating the concrete example of polyethylene terephthalate and its polyester based resin beyond copolymer, for example,
Polybutylene terephthalate (PBT), PEN, PBN, poly terephthalic acid Propylene Glycol
Ester, polytrimethylene naphthalate, polycyclohexylene's dimethyl ester, poly- naphthalenedicarboxylic acid cyclohexane dicarboxylates.
(methyl) acrylic ester resin is the tree with the compound with (methyl) acryloyl group as main composition monomer
Fat.The concrete example of (methyl) acrylic ester resin for example includes poly- (methyl) acrylic acid of polymethyl methacrylate etc
Ester；Methyl methacrylate-(methyl) acrylic copolymer；Methyl methacrylate-(methyl) acrylate copolymer；First
Base methyl acrylate-acrylic acid ester-(methyl) acrylic copolymer；(methyl) acrylate-styrene copolymer (MS
Resin etc.)；Copolymer (such as methyl methacrylate-the first of methyl methacrylate and the compound with alicyclic alkyl
Base acrylate ester copolymer, methyl methacrylate-(methyl) acrylic acid norborneol ester copolymer etc.).Preferably use poly-
(methyl) acrylic acid methyl ester. etc with poly- (methyl) acrylic acid C1-6Arrcostab for main constituent polymer, more preferably use with
Methyl methacrylate is the methyl methacrylate system tree of main constituent (50～100 weight %, preferably 70～100 weight %)
Fat.
Cellulose esters system resin is the ester of cellulose and fatty acid.The concrete example of cellulose esters system resin includes cellulose iii
Acetass, cellulose diacetate, cellulose tripropionate, cellulose dipropionate.Alternatively, it is also possible to enumerate their copolymerization
The resin that thing, a part for hydroxyl have been modified by other substituent groups.In the middle of them, particularly preferred cellulosic triacetate (three second
Acyl cellulose).Cellulosic triacetate has many products commercially to sell, from from the aspect of obtaining easiness, cost
It is favourable.
Polycarbonate-based resin is by the engineering plastic constituted the polymer that monomeric unit is bonded by carbonate group
Material, is with high-impact, thermostability, anti-flammability, transparent resin.Constitute the polycarbonate-based resin of base material film 30
Can be the resin for being referred to as modified polycarbonate modified as polymer backbone to reduce photoelastic coefficient or
Improve the copolymerization polycarbonate of wavelength dependency.
In the middle of more than, consider from viewpoints such as draftability, thermostabilitys, preferably use polypropylene-based resin.
In base material film 30, can be beyond above-mentioned thermoplastic resin, also comprising arbitrary suitable additive.As
Additive, for example, can enumerate UV absorbent, antioxidant, lubricant, plasticizer, releasing agent, anti-coloring agent, fire-retardant
Agent, nucleator, anti-static electricity interference agent, pigment, coloring agent etc..The content of the thermoplastic resin in base material film 30 be preferably 50～
100 weight %, more preferably 50～99 weight %, more preferably 60～98 weight %, particularly preferably 70～97 weights
Amount %.
For the thickness of base material film 30, generally from from the aspect of intensity, the property disposed etc., it is 1～500 μm, preferably 1～
300 μm, more preferably 5～200 μm, more preferably 5～150 μm.
(formation of polyvinyl alcohol resin layer)
The coating fluid for coating base material film 30 preferably makes the powder of polyvinyl alcohol resin be dissolved in good solvent (for example
Water) in obtained by polyvinyl alcohol resin solution.As polyvinyl alcohol resin, it is possible to use by polyvinyl acetate system resin
Resin obtained by saponification.As polyvinyl acetate system resin, except the homopolymer as vinyl acetate can be exemplified
Beyond polyvinyl acetate, the copolymer of vinyl acetate and other monomers that can be copolymerized therewith can also be exemplified.As
Unsaturated carboxylic acid class, olefines, vinyl ethers, no can be enumerated for example with the other monomers of vinyl acetate copolymerization
Saturation sulphonic acids, (methyl) the acrylic acid amides class with ammonium etc..
The saponification degree of polyvinyl alcohol resin can be 80.0～100.0 moles of % scope, preferably 90.0～99.5
The scope of mole %, the more preferably scope of 94.0～99.0 moles of %.If saponification degree is less than 80.0 moles of %, polarization plates
Resistance to water and humidity resistance reduce.In the case of the polyvinyl alcohol resin using saponification degree more than 99.5 moles of %, two
The dyeing kinetics of color pigment are slack-off, and productivity ratio is reduced, and is had and cannot be obtained the polarization plates with enough polarization properties
Situation.
So-called saponification degree, is being denoted as the poly- acetic acid second of the raw material of polyvinyl alcohol resin with unit ratio (mole %)
Contained acetate (acetoxyl group in alkene ester system resin：- OCOCH3) it is changed into the value of the ratio of hydroxyl because of saponifying process, can
To be defined by the formula：
Saponification degree (mole %)=100 × (number of hydroxyl) ÷ (number of the number+acetate of hydroxyl) saponification degree can be according to
JIS K 6726-1994 are obtained.Saponification degree is higher, then it represents that the ratio of hydroxyl is higher, thus represents the acetic acid for hindering crystallization
The ratio of base is lower.
Polyvinyl alcohol resin can also be the modified polyvinylalcohol that a part has been modified.For example, can enumerate will be poly-
The alkene such as vinyl alcohol resin ethylene, propylene；The unsaturated carboxylic acids such as acrylic acid, methacrylic acid .beta.-methylacrylic acid；Unsaturated carboxylic acid
Arrcostab, the resin that has been modified such as (methyl) acrylic acid amides.Modified ratio is preferably less than 30 moles of %, more preferably
Less than 10%.Carry out more than 30 moles of % it is modified in the case of, it is difficult to adsorb dichroism pigment, have and be difficult to be had
The trend of the polarization plates of enough polarization properties.
The average degree of polymerization of polyvinyl alcohol resin is preferably 100～10000, more preferably 1500～8000, further
Preferably 2000～5000.The average degree of polymerization of polyvinyl alcohol resin can also be obtained according to JIS K 6726-1994.
Can be from wire rod rubbing method in the method for base material film 30 by above-mentioned coating solution；Reverse coating, intaglio plate coating
Etc rolling method；Die coating method；Comma rubbing method；Lip coating；Spin-coating method；Silk screen rubbing method；Jetting type rubbing method；Dip coating；
Properly select in the methods such as nebulization.
The baking temperature of coating layer (the polyvinyl alcohol resin layer before being dried) and drying time can be according in coating fluids
The species of contained solvent is setting.Baking temperature is, for example, 50～200 DEG C, preferably 60～150 DEG C.Contain water in solvent
In the case of, baking temperature is preferably more than 80 DEG C.
Polyvinyl alcohol resin layer 6 can only be formed at the one side of base material film 30, it is also possible to be formed at two sides.If formed
In two sides, then the curling of issuable film when can suppress the manufacture of polarizability stacked film 300 (with reference to Fig. 4), and can be with
2 polarization plates are obtained by 1 polarizability stacked film 300, thus it is also favourable at the aspect of the production efficiency of polarization plates.
The thickness of the polyvinyl alcohol resin layer 6 in stacked film 100 is preferably 3～30 μm, more preferably 5～20 μm.Such as
Fruit is the polyvinyl alcohol resin layer 6 with the thickness in the range of this, then through stretching process S20 described later and dyeing process
S30, can obtain dichroism pigment dyeability is good and polarization property is excellent, and sufficiently thin (such as thick less than 10 μm
) polarizer layer 5.
Before the coating of coating fluid, in order to improve the adaptation of base material film 30 and polyvinyl alcohol resin layer 6, it is also possible to
Implement sided corona treatment, corona treatment, fire in surface at least to forming the base material film 30 of the side of polyvinyl alcohol resin layer 6
Flame (flame) process etc..The reasons why being additionally based on identical, it is also possible to press from both sides on base material film 30 and form polyethylene across prime coat etc.
Alcohol resin 6.
Prime coat can by prime coat formation coating solution behind the surface of base material film 30, by be allowed to be dried and
Formed.The coating fluid contain with base material film 30 and 6 both sides of polyvinyl alcohol resin layer play a certain degree of strong closing force into
Point, usually contain for giving the resinous principle and solvent of this kind of closing force.The transparency, heat are preferably used as resinous principle steady
The excellent thermoplastic resin such as qualitative, draftability, for example, can enumerate (methyl) acrylic ester resin, polyvinyl alcohol resin
Deng.Wherein, preferably use the polyvinyl alcohol resin of the closing force for giving good.More preferably polyvinyl alcohol resin.As molten
Agent is usually used the general organic solvent or water solvent that can dissolve above-mentioned resinous principle, preferably by using water as solvent
Coating fluid is forming prime coat.
In order to improve the intensity of prime coat, it is also possible to add cross-linking agent in prime coat formation coating fluid.Cross-linking agent
Concrete example include epoxy, isocyanates system, dialdehyde system, metal system (for example slaine, metal-oxide, metal hydroxidess,
Organo-metallic compound), the cross-linking agent of macromolecular.Polyvinyl alcohol resin is being used as the resinous principle for forming prime coat
In the case of, can suitably use Polyamide Epoxy, methylolated melamine resin, dialdehyde system cross-linking agent, metal
Complex compound system cross-linking agent etc..
The thickness of prime coat is preferably 0.05～1 μm or so, more preferably 0.1～0.4 μm.If less than 0.05 μm, then
The effect that base material film 30 is improved with the closing force of polyvinyl alcohol resin layer 6 is little.
Prime coat formation coating solution can be formed with polyvinyl alcohol resin layer in the method for base material film 30 and is used
Coating fluid it is identical.The baking temperature that the coating layer constituted with coating fluid is formed by prime coat is, for example, 50～200 DEG C, preferably
60～150 DEG C.In the case where solvent contains water, baking temperature is preferably more than 80 DEG C.
(2) stretching process S20
With reference to Fig. 3, this operation is to stretch stacked film 100 and obtain by stretched base material film 30 ' and polyethenol series
The operation of the stretched film 200 that resin bed 6 ' is constituted.Stretching is usually uniaxial tension.Stretching process S20 in the typical case, is
While stacked film 100 of long size are transported, or in the film roll cylinder company of the winding product from the stacked film 100 as long size
Stacked film 100 is rolled out continuously, and while transport to which, continuously carried out.Film is transported and can be carried out using deflector roll etc..
The stretching ratio of stacked film 100 can be properly selected according to desired polarization characteristic, preferably with respect to stacking
The original of film 100 is long more than 5 times and for less than 17 times, more preferably greater than 5 times and for less than 8 times.If stretching ratio be 5 times with
Under, then polyvinyl alcohol resin layer 6 ' fully will not be orientated, therefore have the not high enough situation of the degree of polarization of polarizer layer 5.
On the other hand, the fracture of film, and the thickness of stretched film 200 if stretching ratio is more than 17 times, are easily produced in stretching
It is thin to more than necessary degree, processability in subsequent handling and the property disposed are likely to decrease.
Stretch processing is not limited to one section of stretching, it is also possible to carry out multistage.In this case, can be in dyeing process
All multistage stretch processing is carried out before S30 continuously, it is also possible to processed with the dyeing in dyeing process S30 and/or handed over
Connection process simultaneously carries out the later stretch processing of second stage.It is in the case of stretch processing is carried out in multistage like this, excellent
Selecting carries out stretch processing in the way of the stretching ratio more than 5 times is reached after whole stages of stretch processing are added.
Stretch processing also may be used in addition to it can be the longitudinal stretching stretched along film length direction (film carriage direction)
Being cross directional stretch or oblique extension for being stretched along film width etc..As longitudinal stretching mode, use can be enumerated
Stretching, compression stretching between the roller stretched by roller, stretching of chuck (clip) etc. is used, as cross directional stretch mode, can be with
Enumerate tenter frame process etc..Stretch processing can adopt wet tensile method, dry-stretch process it is any number of, and from can be from big
Scope in select draft temperature this point to consider, preferably use dry-stretch process.
Draft temperature is set to show with the degree of 30 entirety of stretching polyethylene alcohol resin 6 and base material film
It is more than the temperature of mobility, preferably -30 DEG C to+30 DEG C of the phase transition temperature (fusing point or glass transition temperature) of base material film 30
Scope, more preferably -30 DEG C to+5 DEG C of scope, more preferably -25 DEG C to+0 DEG C of scope.Base material film 30 by
In the case that multiple resin beds are constituted, above-mentioned phase transition temperature refers to the highest in the middle of the phase transition temperature shown by the plurality of resin bed
Phase transition temperature.
If making draft temperature less than -30 DEG C of phase transition temperature, the high magnification stretching more than 5 times, Huo Zheyin are difficult to
The mobility of base material film 30 is too low and having makes stretch processing become difficult trend.If draft temperature is higher than phase transition temperature+30
DEG C, then there can be the trend for making stretching become difficulty because the mobility of base material film 30 is excessive.Due to easily realizing more than 5 times
In high stretching ratio, therefore draft temperature preferably above range, more preferably more than 120 DEG C.
As the heating means of the stacked film 100 in stretch processing, there is region heating (being for example blown into hot blast and adjusting
The method heated in drawing zone for the given heating furnace of temperature etc.)；When being stretched using roller heating roller from
The method of body；Heater heating is (by infrared heater, halogen heater, plate heater etc. located at the upper of stacked film 100
Method that is lower and being heated using radiant heat) etc..Between roller in stretching mode, from from the viewpoint of the uniformity of draft temperature
Favored area heating.
The pre-heat treatment operation for preheating stacked film 100 can also be set before stretching process S20.As preheating side
Method, it is possible to use with the heating means identical method in stretch processing.Preheating temperature is preferably -50 DEG C of draft temperature and arrives ± 0
DEG C scope, the more preferably scope of -40 DEG C to -10 DEG C of draft temperature.
Alternatively, it is also possible to, after the stretch processing in stretching process S20, arrange heat fixation treatment process.At heat fixation
While reason is the maintenance tense situation in the state of the end using clip grab tensile film 200, in polyvinyl alcohol resin
Crystallized temperature more than carry out the process of heat treatment.Processed using the heat fixation, polyvinyl alcohol resin layer 6 ' can be promoted
Crystallization.The scope of the temperature of heat fixation process preferably -0 DEG C～-80 DEG C of draft temperature, more preferably draft temperature -
0 DEG C～-50 DEG C of scope.
(3) dyeing process S30
With reference to Fig. 4, this operation is that the polyvinyl alcohol resin layer 6 ' of stretched film 200 is dyeed with dichroism pigment and is allowed to
Gas absorption quantity, the operation for making polarizer layer 5.Can obtain being laminated with the one or both sides of base material film 30 ' through this operation
The polarizability stacked film 300 of polarizer layer 5.Dyeing process S30 in the typical case, is in the stretched film for transporting long size
While 200, or from the stretched film 200 as long size winding product film roll cylinder continuously roll out stretched film 200, and
While transport to which, continuously carry out.Film transport can be carried out using deflector roll etc..
As dichroism pigment, iodine or dichroic organic dye can be specifically enumerated.The tool of dichroic organic dye
Style for example includes redness BR (RedBR), redness LR (Red LR), red R (RedR), pink LB (Pink LB), ruby red BL
(Rubine BL), purplish red GS (Bordeaux GS), sky blue LG (Sky Blue LG), lemon yellow, blueness BR (Blue BR), indigo plant
Color 2R (Blue 2R), purplish blue RY (Navy RY), green LG (Green LG), purple LB (Violet LB), purple B (Violet
B), black H (Black H), black B (Black B), black GSP (Black GSP), yellow 3G (Yellow 3G), yellow R
(Yellow R), orange LR (Orange LR), orange 3R (Orange 3R), scarlet GL (Scarlet GL), scarlet KGL
(Scarlet KGL), Congo red (Congo Red), brilliant violet BK (Brilliant Violet BK), Supra Blue G,
Supra Blue GL, Supra Orange GL, direct sky blue, direct everbright fast orange S and resistance to tanned (Fast Black) etc..Two colors
Property pigment can only be used alone a kind, it is also possible to and use two or more.
Dyeing process S30 can be by impregnated in enter stretched film 200 in the solution containing dichroism pigment (dye bath)
OK.As dye bath, it is possible to use the solution being dissolved in above-mentioned dichroism pigment in solvent.As the solvent of staining solution,
Water is generally used, but can also also add the organic solvent that there is the compatibility with water.Dichroism pigment in dye bath it is dense
Degree is preferably 0.01～10 weight %, more preferably 0.02～7 weight %.
Due in the case where iodine is used as dichroism pigment, improving staining efficiency, therefore preferably to containing iodine
Dye bath in add iodide again.As iodide, for example, can enumerate potassium iodide, lithium iodide, sodium iodide, zinc iodide, iodine
Change aluminum, lead iodide, Copper diiodide, barium iodide, calcium iodide, Tin tetraiodide., titanium iodide etc..The concentration of the iodide in dye bath is preferably
0.01～20 weight %.In iodide, preferably add potassium iodide.In the case of addition potassium iodide, the ratio of iodine and potassium iodide
Example is preferably 1 with weight ratio meter：5～1：100, more preferably 1：6～1：80.The temperature of dye bath is preferably 10～60 DEG C, more
Preferably 20～40 DEG C.
And, additional stretch processing can also be implemented again to stretched film 200 in dyeing process S30.As the situation
Under embodiment, such a way etc. can be enumerated, i.e. 1) in above-mentioned stretching process S20, to enter less than the multiplying power of target
After row stretch processing, in the dyeing of dyeing process S30 is processed, carried out in the way of making total stretching ratio reach the multiplying power of target
Stretch processing；As described later, in the case of carrying out crosslinking Treatment after dyeing process, 2) in above-mentioned stretching process S20, with low
After the multiplying power of target carries out stretch processing, in the dyeing of dyeing process S30 is processed, stretch processing is carried out to total stretching ratio
The degree of the multiplying power of miss the mark, then, in the way of making final total stretching ratio reach the multiplying power of target at crosslinking
Stretch processing is carried out in reason.
Dyeing process S30 can include being connected on the crosslinking Treatment operation implemented after dyeing is processed.Crosslinking Treatment operation can
Impregnated in the solution containing cross-linking agent (crosslinking bath) to carry out with the stretched film after by dyeing is processed.As cross-linking agent,
The boron compound of boric acid, Borax etc, Biformyl, glutaraldehyde etc. can for example be enumerated.Cross-linking agent only can use a kind, also may be used
With and use two or more.As crosslinking bath, it is possible to use the solution being dissolved in cross-linking agent in solvent.As solvent, it is possible to use
Water, it is also possible to also containing the organic solvent with water with the compatibility.The concentration of the cross-linking agent in crosslinking bath is preferably 1～20 weight
Amount %, more preferably 6～15 weight %.
Crosslinking bath can also contain iodide.Using the addition of iodide, the polarization in the face of polarizer layer 5 can be made special
Property more homogenization.The concrete example of iodide is same as described above.The concentration of the iodide in crosslinking bath is preferably 0.05～15 weight
Amount %, more preferably 0.5～8 weight %.The temperature of crosslinking bath is preferably 10～90 DEG C.
And, crosslinking Treatment can also be simultaneously carried out with dyeing process by cross-linking agent is coupled in dye bath.
Alternatively, it is also possible to the crosslinking bath of more than two kinds for using composition different, the process that impregnated in crosslinking bath of more than 2 times is carried out.
Stretch processing can be carried out in crosslinking Treatment.The specific mode for implementing stretch processing in crosslinking Treatment is as described above.
It is preferred that after dyeing process S30, carrying out matting and back tender before the first bonding process S40 described later
Sequence.Matting generally includes water matting.Water cleaning treatment can by dyeing is processed after or after crosslinking Treatment
Film immersion is carried out in the pure water of ion exchange water, distilled water etc.Water cleaning temperature is usually 3～50 DEG C, preferably 4～
20℃.Matting can also be the combination of water matting and the matting by iodide solution.As in scavenger
The drying process carried out after sequence, can be using the arbitrary suitable method such as natural drying, forced air drying, heat drying.Example
Such as in the case of heat drying, baking temperature is usually 20～95 DEG C.
The thickness of the polarizer layer 5 that polarizability stacked film 300 has is preferably less than 10 μm, more preferably less than 7 μm.
By the thickness of polarizer layer 5 is set to less than 10 μm, slim polarization plates can be obtained.The thickness of polarizer layer 5 is usually 2
More than μm.According to the present invention, even if the thickness of thin to less than 10 μm in polarizer layer 5, by polarizer layer 5 and the first protecting film
In the polarization plates of composition in the case of no stiffness, it is also possible to suppress to produce cohesion destruction, or polarizer layer in polarizer layer 5
The not good situation of albefaction in 5 release surface, neatly peeling base film 30 ' there is.
(4) first bonding process S40
With reference to Fig. 5, this operation is in the (i.e. inclined with the face of the face opposite side of 30 ' side of base material film of polarizability stacked film 300
Shake on lamella 5) laminating the first protecting film 10 and obtain the operation of multilayer film 400.First bonding process S40 is in typical situation
Under, it is while the polarizability stacked film 300 of long size is transported, or from the polarizability stacked film 300 as long size
The film roll cylinder of winding product continuously roll out polarizability stacked film 300, and while transport to which, continuously carry out.Can
To carry out film transport using deflector roll etc..
In the case where polarizability stacked film 300 has polarizer layer 5 on the two sides of base material film 30 ', generally on two sides
Fitted on polarizer layer 5 respectively the first protecting film 10.In this case, these first protecting film 10 can be protecting film of the same race,
It can also be protecting film not of the same race.
First protecting film 10 can be pressed from both sides and be fitted on polarizer layer 5 across the first gluing oxidant layer 15.Form the first adhesive
The adhesive of layer 15 can be the irradiation containing the active energy beam because of ultraviolet, visible ray, electron beam, X-ray etc and
The active energy ray-curable adhesive (preferably ultra-violet solidified adhesive) of the curable compound of solidification, or will be poly-
The adhesive component of vinyl alcohol resin etc is dissolved or dispersed in the water system adhesive in water.
In the case of the first protecting film 10 of being fitted using active energy ray-curable adhesive, in folder across becoming the
After the active energy ray-curable adhesive of one gluing oxidant layer 15 is laminated in the first protecting film 10 on polarizer layer 5, irradiation
The active energy beam of ultraviolet, visible ray, electron beam, X-ray etc and make the solidification of gluing oxidant layer.Wherein it is suitably for ultraviolet
Line, as light source in this case, it is possible to use low pressure mercury lamp, middle medium pressure mercury lamp, high-pressure mercury-vapor lamp, extra-high-pressure mercury vapour lamp,
Chemical lamp, black light lamp, microwave-excitation finsen lamp, metal halide lamp etc..In the case of using water system adhesive, as long as in folder
After water system adhesive is laminated in the first protecting film 10 on polarizer layer 5, heats and be allowed to be dried.
When the first protecting film 10 is fitted in polarizer layer 5, for the first protecting film 10 and/or the patch of polarizer layer 5
Conjunction face, in order to improve the adhesivity with polarizer layer 5, can carry out corona treatment, sided corona treatment, at ultraviolet irradiation
The surface treatment (easily gluing process) of reason, flame (flame) process, saponification process etc, wherein, preferably carry out at plasma
Reason, sided corona treatment or saponification process.
First protecting film 10 can for example be by chain polyolefin-based resins (polypropylene-based resin etc.), cyclic polyolefin hydrocarbon system
The polyolefin-based resins of resin (norbornene resin etc.) etc；Cellulosic triacetate, cellulose diacetate etc
Cellulose esters system resin；Polyethylene terephthalate, PEN, polybutylene terephthalate (PBT) it
The polyester based resin of class；Polycarbonate-based resin；The film of the compositions such as (methyl) acrylic ester resin.
First protecting film 10 can also be the protecting film for having optical function concurrently of phase retardation film, brightness raising film etc.Example
Such as, can be stretched (be stretched uniaxially or biaxially) by the film to being made up of above-mentioned thermoplastic resin, or in the film
It is upper to form liquid crystal layer etc. and make the phase retardation film for imparting arbitrary phase difference value.
Hard conating, antiglare layer can also be formed, is prevented on the surface with 5 opposite side of polarizer layer of the first protecting film 10
The surface-treated layer (coating layer) in reflecting layer, anti-static electricity interference layer, stain-proofing layer etc.Surface-treated layer can be pasted implementing first
Close operation S40 before be previously formed on the first protecting film 10, it is also possible to implement the first bonding process S40 after or implement it is aftermentioned
Stripping process S50 after formed.In addition, the first protecting film 10 can contain one kind or two or more lubricant, plasticizer, dispersion
The additive of agent, heat stabilizer, UV absorbent, infrared absorbent, anti-static electricity interference agent, antioxidant etc.
From from the viewpoint of the slimming of polarization plates, the thickness of the first protecting film 10 is preferably less than 90 μm, more preferably
Less than 50 μm, more preferably less than 35 μm, particularly preferably less than 30 μm.From from the viewpoint of intensity and the property disposed, the
The thickness of one protecting film 10 is usually more than 5 μm.According to the present invention, though the first protecting film 10 thickness of thin to 35 μm with
Under, in the case of no stiffness in the polarization plates being made up of polarizer layer 5 and the first protecting film 10, it is also possible to suppress inclined
The lamella 5 that shakes produce cohesion destruction, or the release surface of polarizer layer 5 there is the not good situation of albefaction, neatly peeling base film
30’。
(5) stripping process S50
With reference to Fig. 6, this operation is to peel off to remove base material film 30 ' and obtain polarization plates (one side is with protection from multilayer film 400
The polarization plates of film operation 500).There is polarizer layer 5, protect first on the two sides of base material film 30 ' in polarizability stacked film 300
In the case that cuticula 10 fits in the polarizer layer 5 of this two side, using stripping process S50, can be by 1 polarizability stacked film
300 obtain polarization plates 500 of 2 one sides with protecting film.Stripping process S50 in the typical case, is to transport long size
Multilayer film 400 while, or from the multilayer film 400 as long size winding product film roll cylinder continuously rolling out multilamellar
Film 400, and while transport to which, continuously carry out.Film transport can be carried out using deflector roll etc..
As shown in fig. 7, in the present invention, roller 40 is arranged in the transport path of multilayer film 400, by multilayer film 400 along this
Transport path is continuously transported, and multilayer film 400 is set to itself and the base material film 30 ' opposite side (example of Fig. 7 when by roller 40
In be 10 side of the first protecting film, i.e., to make the first protecting film 10 of multilayer film 400 as 40 side of roller in the way of) on roller 40
State, from the 400 peeling base film 30 ' of multilayer film of the state in having wound.As roller 40, it is possible to use for supporting
Common roller film, rotating freely of transport.
By with the transport side with polarization plates 500 of the one side from after 400 peeling base film 30 ' of multilayer film with protecting film
The transport path of the base material film 30 ' after peeling off is set to the mode for different carriage directions, and from the multilamellar on roller 40
The continuously peeling base film 30 ' of film 400, now, make at the pick-up point H for maintaining base material film 30 ' multilayer film 400 and base material
Peel off while the state that the face (being the surface of 10 side of the first protecting film in the example of Fig. 7) of 30 ' opposite side of film is contacted with roller 40
Base material film 30 '.That is, base material film 30 ' after to stripping give a certain degree of tension force A and with pulling base material film 30 ' from many
400 peeling base film 30 ' of tunic, now using tension force A, will not be changed into from roller 40 with being controlled to multilayer film 400 in pick-up point H
Surface float state while continuously peeling base film 30 '.
The so-called state by multilayer film 400 on roller 40, refer to by roller 40 when multilayer film 400 and base material film
The state contacted with the surface of roller 40 is carried out with face in the face (being the surface of 10 side of the first protecting film in the example of Fig. 7) of 30 ' opposite side.
With reference to Fig. 7, the state can be by angle of inclination φ p to be set to realize more than 0 ° (less than 90 °), the angle of inclination φ p
Be multilayer film 400 before being stripped by base material film 30 ' carriage direction extrapolation line on the basis of when, peel off base material film 30 '
The carriage direction of multilayer film 400 (i.e. polarization plates 500 of the one side with protecting film) afterwards is towards inclining at the pick-up point H of 40 side of roller
Rake angle.Angle of inclination φ p are preferably more than 20 °.
According to above-mentioned method, the no matter differently- oriented directivity angulation of the peeling direction of base material film 30 ' and polarizer layer 5
How, in addition, no matter the multilayer film 400 at pick-up point H (is gone up with 500 angulation of polarization plates of the one side with protecting film
Angle of inclination φ p for stating) associating with multilayer film 400 and 30 ' angulation of base material film (angle of inclination φ k shown in Fig. 7)
Property how, can effectively can suppress to be made by the stripping of base material film 30 ' from the swimmingly peeling base film 30 ' of multilayer film 400
Into polarizer layer 5 cohesion destruction or the not good situation of the albefaction of release surface etc of polarizer layer 5.φ k are with above-mentioned outer
It is when on the basis of push away line, peel off after base material film 30 ' carriage direction towards with the pick-up point H of 40 side opposite side of roller at incline
Rake angle.
In the stripping of base material film 30 ', for maintaining multilayer film 400 at the pick-up point H and 30 ' opposite side of base material film
The effective ways of state that contact with roller 40 of face (being the surface of 10 side of the first protecting film in the example of Fig. 7) be to make stripping
Tension force (production line tension) B of the multilayer film 400 before base material film 30 ' is enough compared with the tension force A of the base material film 30 ' after stripping
Greatly.Tension force A and B preferably meet the relation of B >=10 × A, more preferably meet the relation of B >=12 × A.By making tension force B and tension force A
Compare sufficiently large, it is possible to the multilayer film 400 in the state by multilayer film 400 on roller 40 of maintenance and at the pick-up point H
Contact with roller 40 with the face of 30 ' opposite side of base material film state while, carry out the stripping of the base material film 30 ' at pick-up point H
From.And, before the tension force and peeling base film 30 ' of polarization plates 500 of the one side obtained by peeling base film 30 ' with protecting film
Multilayer film 400 tension force B it is identical.
With reference to Fig. 7, for example can be by using in the transport path of the base material film 30 ' being configured at after peeling off and being configured at roller
The adjustment of the rotating speed of the niproll 60 in 40 downstream is adjusted to the travelling speed of the base material film 30 ' after stripping, is controlled
Tension force A.The roller being configured in the transport path of the polarization plates 500 of multilayer film 400 and one side with protecting film can for example be utilized
The rotating speed of the niproll 50 before and after 40 and the adjustment of the ratio of the rotating speed of niproll 70, control tension force B.
For maintain state by multilayer film 400 on roller 40 and at the pick-up point H multilayer film 400 and base
Another effective ways for the state that the face of 30 ' opposite side of material film is contacted with roller 40 are to use vacuum furnace as roller 40.If
Using vacuum furnace, it is possible to use the suction of vacuum furnace makes multilayer film 400 on the roller, and (and one side is with protecting film
Polarization plates are 500) closely sealed with roller surface, therefore easily maintain above-mentioned state.So-called vacuum furnace, refers to following roller, i.e. in roller
Surface (side face) is keeping transporting thing using making roller surface absorption transport thing from the air-breathing of the suction hole with multiple suction holes
While, rotate roller, thus transport to transporting thing.In the case of using vacuum furnace, tension force A and B are not necessarily required to
Meet the relation of B >=10 × A.
For maintain state by multilayer film 400 on roller 40 and at the pick-up point H multilayer film 400 and base
Another effective ways for the state that the face of 30 ' opposite side of material film is contacted with roller 40 are, multilayer film 400 by roller 40 it
Before, resin film is fitted again in 10 side of the first protecting film and carry out film reinforcement.Film is strengthened causing the stiffness of multilayer film 400 to become strong,
It is difficult to deform, therefore when drawing base material film 30 ' is peeled off from multilayer film 400, the multilayer film 400 at pick-up point H can be suppressed
It is changed into from the surface of roller 40 state for floating.In the case of using the method, tension force A and B are also not necessarily required to meet B >=10
The relation of × A.In the case of using the method, the resin film of 10 side of the first protecting film is fitted in strengthen in pick-up point
The state contacted with roller 40 can be kept at H.
The diameter of roller 40 is preferably more than 200mm φ, more preferably more than 250mm φ.If a diameter of model of roller 40
Enclose, then when base material film 30 ' is peeled off from multilayer film 400, easily maintain multilayer film 400 at the pick-up point H with base material film 30 '
The state that the face of opposite side is contacted with roller 40.
In order to the state contacted with roller 40 with the face of 30 ' opposite side of base material film of multilayer film 400 is maintained at pick-up point H
And the stripping of base material film 30 ' is stably carried out, the sensor of the position for being preferably provided for detecting pick-up point H.Using sensor
Setting, can prevent multilayer film 400 will on roller 40 before, float from the surface of roller 40 in the state of base material
Film 30 ' is stripped, or releasing the base material film to after the winding on roller 40, in the state of floating from the surface of roller 40 of multilayer film 400
30 ' are stripped.For example, the reference position of pick-up point is preset, is arranged in the upstream side for leaving the given distance in the reference position
One sensor, arranges a sensor again in the downstream for leaving the given distance in reference position in addition, is set as if upstream
The sensor of side detects pick-up point and then makes pick-up point downstream side shifting, if the sensor in downstream detects stripping in addition
Point then makes pick-up point move to the upstream side, such that it is able to automatically adjust operating condition so that pick-up point always comes benchmark position
Near putting.As operating condition, travelling speed, the stripping of the polarization plates 500 of multilayer film 400 and one side with protecting film can be enumerated
The travelling speed of the base material film 30 ' after, tension force A, tension force B.
Angle of inclination φ k at the pick-up point H of the carriage direction of the base material film 30 ' after stripping are typically larger than 0 °, preferably
More than 20 °, more preferably more than 40 °.By angle of inclination φ k are set as more than 20 °, tension force A would not be made excessive, easily
Swimmingly peeling base film 30 '.Angle of inclination φ k are typically smaller than 90 °.
As described above, the multilayer film 400 obtained in the first bonding process S40 can be distinguished on the two sides of base material film 30 '
It is laminated with the film of polarizer layer 5 and the first protecting film 10, i.e. can be with 10/ polarizer layer of the first protecting film, 5/ base material film
The film that the layer of 30 '/polarizer layer, 5/ first protecting film 10 (omitting 15 ground of the first gluing oxidant layer to record) is constituted.In this case, Jing
Cross 2 sections of stripping process and polarization plates 500 of 2 one sides with protecting film are obtained by 1 multilayer film 400.In the stripping of first paragraph
In operation, the layer with " 10/ polarizer layer of the first protecting film, 5/ base material film 30 ' " is peeled off from the multilayer film 400 of above-mentioned composition
The film of composition, (in the stripping process of first paragraph, the base material film 30 ' of Fig. 7 is set to obtain polarization plates 500 of the one side with protecting film
It is changed to 10/ polarizer layer of the first protecting film, 5/ base material film 30 ').In the stripping process of second segment, from being stripped out with "
The film peeling base film 30 ' that the layer of one protecting film, 10/ polarizer layer, 5/ base material film 30 ' " is constituted, one side of getting back carry protecting film
Polarization plates 500.
In the stripping process of first paragraph and second segment, use and the first protecting film is peeled off according to the said method of the present invention
10/ polarizer layer, 5/ base material film 30 ' or base material film 30 ', it is possible thereby to effectively suppress the cohesion destruction of polarizer layer 5 or polarize
The not good situation of the albefaction of release surface of lamella 5 etc.
(6) second bonding process S60
With reference to Fig. 8, this operation is that laminating second is protected on the polarizer layer 5 of polarization plates 500 of the one side with protecting film
Film 20 and obtain two-sided polarization plates 600, the arbitrary operations with protecting film.Second bonding process S60 is in typical situation
Under, it is while polarization plates 500 of the one side with protecting film of long size are transported, or from the one-side band as long size
The film roll cylinder for having the winding product of the polarization plates 500 of protecting film continuously rolls out polarization plates 500 of the one side with protecting film, and to which
While transport, continuously carry out.Film transport can be carried out using deflector roll etc..
Second protecting film 20 can be pressed from both sides and be fitted on polarizer layer 5 across the second gluing oxidant layer 25.For the second protecting film
20 and second gluing oxidant layer 25 composition and material and the second protecting film 20 applying method, quote respectively with regard to first protect
Cuticula 10 and the first gluing oxidant layer 15, and the first protecting film 10 applying method record.
Embodiment
Hereinafter, provide embodiment and comparative example carries out more specific description to the present invention, but the present invention does not receive these
Example is limited.
1 ＞ of ＜ embodiments
(1) prime coat formation process
By pva powder (" Z-200 ", average degree of polymerization 1100, saponification degree that Japanese synthetic chemical industry (strain) is made
99.5 moles of %) it is dissolved in 95 DEG C of hot water, prepare the polyvinyl alcohol water solution of 3 weight % of concentration.To the water-soluble of gained
(making on field ridge chemical industry (strain) relative to the ratio mixed cross-linker that 6 weight portion of pva powder is 5 weight portions in liquid
" Sumirez Resin 650 "), obtain prime coat formation coating fluid.
Then, continuously transporting thick 90 μm base material film (un-stretched polypropylene film, fusing point：163 DEG C) while, to which
After simultaneously implementing sided corona treatment, above-mentioned prime coat is continuously coated with using minor diameter gravure coater in its sided corona treatment face and is formed
With coating fluid, in 80 DEG C of dryings 10 minutes, thick 0.2 μm prime coat is consequently formed.
(2) making (resin bed formation process) of stacked film
By pva powder (" PVA124 " of (strain) Kuraray, average degree of polymerization 2400, saponification degree 98.0～
99.0 moles of %) it is dissolved in 95 DEG C of hot water, the polyvinyl alcohol water solution of 8 weight % of concentration is prepared, as polyethylene
Alcohol resin formation coating fluid.
While the base material film with prime coat made in above-mentioned (1) is continuously transported, make in its primer coat surface
Continuously it is coated with after above-mentioned polyvinyl alcohol resin layer formation coating fluid with die lip coating machine, in 80 DEG C of dryings 20 minutes, by
This forms polyvinyl alcohol resin layer on prime coat, obtains the layer being made up of base material film/prime coat/polyvinyl alcohol resin layer
Folded film.
(3) making (the first stretching process) of stretched film
For the stacked film made in above-mentioned (2), while continuously transporting, using the longitudinal uniaxial tension dress for floating
The free end uniaxial tension for implementing 5.8 times at 160 DEG C is put, stretched film is obtained.The thickness of the polyvinyl alcohol resin layer after stretching
For 5.0 μm.
(4) making (dyeing process) of polarizability stacked film
While the stretched film made in above-mentioned (3) is continuously transported, continuously it is immersed in containing iodine and potassium iodide
Polyethylene has been carried out in 26 DEG C of dye bath (containing 0.35 weight portion of iodine, 10 weight portion of potassium iodide in every 100 weight portion water)
The dyeing of alcohol resin is processed.
Then, the crosslinking at containing boric acid and potassium iodide 78 DEG C is bathed and (contains 9.5 weight of boric acid in every 100 weight portion water
Part, 5 weight portion of potassium iodide) in make the holdup time be continuously to impregnate in the way of 300 seconds to have carried out crosslinking Treatment.Thereafter,
Cleaned with 8 DEG C of pure water 10 seconds, in 40～50 DEG C of dryings 200 seconds, thus obtain the polarization with polarizer layer on base material film
Property stacked film.
(5) making (bonding process) of multilayer film
While thick 15 μm cyclic polyolefin resin film (" ZF14 " that Japanese ZEON (strain) is made) is continuously transported,
In the way of the thickness of its gluing oxidant layer simultaneously after to make solidification is 1.0 μm, continuously applied using minor diameter gravure coater
Cloth contains the ultraviolet of the curable compound and light cationic polymerization initiator of the epoxy based compound as cationically polymerizable
Line curable adhesive (" KR-70T " of (strain) ADEKA), next, doubling roller is used, it is inclined by what is made in above-mentioned (4)
Shaking property stacked film is continuously fitted in its polarizer layer side in the gluing oxidant layer that this is coated with.Thereafter, from base material film side with
150mJ/cm2Accumulated light irradiation ultraviolet radiation, thus make the solidification of gluing oxidant layer, obtain multilayer film.
(6) making (stripping process) of polarization plates
With reference to Fig. 7, while multilayer film 400 made in above-mentioned (5) are continuously transported, being formed when by roller 40 will
Multilayer film 400 with its 10 side of the first protecting film (to make the first protecting film 10 of multilayer film 400 as 40 side of roller in the way of) wound on
State on roller 40, from the multilayer film 400 of state in having wound, pick-up point H places maintain the first protecting film 10 and
While the state of the contact of roller 40, continuously peeling base film 30 ', obtains polarization plates 500 of the one side with protecting film.Now,
The tension force B such as tables 1 of the tension force A and multilayer film 400 of the base material film 30 ' after stripping and polarization plates 500 of the one side with protecting film
It is shown.In addition, angle of inclination φ p are set to 20 °, angle of inclination φ k are set to 70 °, and the diameter of roller 40 is set to 250mm φ.As roller
40, use for supporting transported film, not vacuum furnace common the roller (" kind of roller in table 1 for rotating freely
Described in a class " hurdle it is " common ").At continuously peeling base film 30 ', pick-up point H is visually observed, it is seen that first
The state that protecting film 10 is contacted with the holding of roller 40.The situation can also be confirmed from the enlarged photograph of pick-up point H.
＜ embodiments 2～3,1～2 ＞ of comparative example
In addition to making tension force A and tension force B as shown in table 1, one side is produced same as Example 1ly and carries protecting film
Polarization plates 500.Wherein, in embodiment 3, vacuum furnace is used as roller 40, make wound on this in the suction using the vacuum furnace
Peeling base film 30 ' while polarization plates 500 of the multilayer film 400 and one side on roller with protecting film are closely sealed with roller surface.
In comparative example 1 and 2, the first protecting film 10 is not in contact with roller 40 at the pick-up point H, and multilayer film 400 is in profit
The state floated from roller surface with visual identifiable degree.
(evaluation of fissility)
(1) evaluation of exfoliated state
The release surface for removing polarization plates 500 of the one side with protecting film obtained by base material film 30 ' is peeled off in visually observation
(polaroid aspect), the exfoliated state according to following benchmark evaluation.The results are shown in Table 1.
A：Can't see cohesion destruction and albefaction,
B1：Can see cohesion destruction,
B2：Albefaction can be seen.
(2) peel off the evaluation of stability
The stripping stability of base material film 30 ' is visually observed, is evaluated according to following benchmark.Result is represented
In table 1.
A：Stable,
B：It is unstable.
Herein, B peeling force fine strong and weak changes repeatedly when peeling off, are variation, peel angle shakinesses before and after pick-up point H
Fixed state, also referred to as slide fastener phenomenon (zippering).A is the state peeled off while this kind of slide fastener phenomenon does not occur.
[table 1]
The explanation of symbol
5 polarizer layers, 6 polyvinyl alcohol resin layers, 6 ' stretched polyvinyl alcohol resin layers, 10 first protections
Film, 15 first gluing oxidant layer, 20 second protecting film, 25 second gluing oxidant layer, 30 base material films, 30 ' stretched base material films, 40
Roller, 50,60,70 niprolls, 100 stacked films, 200 stretched film, 300 polarizability stacked films, 400 multilayer films, 500 one sides are with guarantor
The polarization plates of cuticula, the 600 two-sided polarization plates with protecting film, H pick-up points.
Claims (6)
1. a kind of manufacture method of polarization plates, including：
Resin bed formation process, forms polyvinyl alcohol resin layer at least one side of base material film and obtains stacked film；
Stretching process, is stretched to the stacked film and is obtained stretched film；
Dyeing process, the polyvinyl alcohol resin layer of the stretched film is dyeed with dichroism pigment and polarizer layer is formed, by
This obtains polarizability stacked film；
Bonding process, fits protecting film in the face of the face opposite side with base material film side of the polarizability stacked film and obtains many
Tunic；With
Stripping process, peels off from the multilayer film and removes base material film and obtain polarization plates,
The stripping process be by the multilayer film with its with base material film opposite side on roller in the state of carry out, and
And when the base material film is peeled off from the multilayer film, to keep contrary with base material film the one of the multilayer film at its pick-up point
The mode of the state that the face of side is contacted with the roller is carried out.
2. manufacture method according to claim 1, wherein,
The tension force of the base material film after by stripping is set to A, by peeling base film before the tension force of the multilayer film be set to B
When, the peeling base film under conditions of B >=10 × A is met.
3. manufacture method according to claim 1, wherein,
The roller is vacuum furnace, peeling base film while multilayer film on roller is aspirated using vacuum furnace.
4. the manufacture method according to any one of claims 1 to 3, wherein,
A diameter of more than 200mm of the roller.
5. the manufacture method according to any one of Claims 1 to 4, wherein,
The thickness of the polarizer layer is less than 10 μm.
6. the manufacture method according to any one of Claims 1 to 5, wherein,
The thickness of the protecting film is less than 35 μm.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2014148839A JP6203143B2 (en) | 2014-07-22 | 2014-07-22 | Manufacturing method of polarizing plate |
| JP2014-148839 | 2014-07-22 | ||
| PCT/JP2015/068161 WO2016013342A1 (en) | 2014-07-22 | 2015-06-24 | Method for manufacturing polarizing plate |
Publications (2)
| Publication Number | Publication Date |
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| CN106575009A true CN106575009A (en) | 2017-04-19 |
| CN106575009B CN106575009B (en) | 2019-06-28 |
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| CN201580040169.2A Active CN106575009B (en) | 2014-07-22 | 2015-06-24 | The manufacturing method of polarization plates |
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| Country | Link |
|---|---|
| JP (1) | JP6203143B2 (en) |
| KR (1) | KR101893711B1 (en) |
| CN (1) | CN106575009B (en) |
| TW (1) | TW201605638A (en) |
| WO (1) | WO2016013342A1 (en) |
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| KR102441217B1 (en) * | 2014-07-04 | 2022-09-06 | 스미또모 가가꾸 가부시키가이샤 | Method for producing polarizing plate having protective films on both surfaces thereof |
| WO2017159233A1 (en) * | 2016-03-14 | 2017-09-21 | 住友化学株式会社 | Method for manufacturing resin film and method for manufacturing polarizing film |
| JP6353016B2 (en) * | 2016-03-14 | 2018-07-04 | 住友化学株式会社 | Method for producing resin film and method for producing polarizing film |
| JP7188386B2 (en) * | 2017-07-25 | 2022-12-13 | 日本ゼオン株式会社 | Method for manufacturing polarizing plate and display device |
| JP6494844B1 (en) * | 2017-10-31 | 2019-04-03 | 住友化学株式会社 | Manufacturing method of resin film and resin film with few micro scratches |
| JP7379420B2 (en) * | 2021-07-15 | 2023-11-14 | 日東電工株式会社 | Functional layer manufacturing method |
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| CN102171122A (en) * | 2008-09-30 | 2011-08-31 | 琳得科株式会社 | Film-peeling method, process for production of optical film, film-peeling mechanism, and apparatus for production of optical film |
| JP2011178523A (en) * | 2010-03-02 | 2011-09-15 | Toppan Printing Co Ltd | Film/thin-film separating and continuous thin-film splicing device |
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| CN103201656A (en) * | 2010-11-10 | 2013-07-10 | 住友化学株式会社 | Methods for producing polarizing laminate film and polarizing plate |
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|---|---|---|---|---|
| JP4279944B2 (en) | 1999-06-01 | 2009-06-17 | 株式会社サンリッツ | Manufacturing method of polarizing plate |
| JP2013033084A (en) | 2011-08-01 | 2013-02-14 | Sumitomo Chemical Co Ltd | Method for manufacturing polarizer |
| JP5885955B2 (en) * | 2011-08-01 | 2016-03-16 | 住友化学株式会社 | Manufacturing method of polarizing plate |
| JP6154099B2 (en) * | 2012-02-03 | 2017-06-28 | 住友化学株式会社 | Method for producing polarizing laminated film and method for producing polarizing plate |
| JP6029560B2 (en) * | 2012-11-16 | 2016-11-24 | 日東電工株式会社 | Manufacturing method of polarizing plate |
| JP6366266B2 (en) * | 2013-12-25 | 2018-08-01 | 日東電工株式会社 | Polarizing plate and manufacturing method of polarizing plate |
| JP2015121720A (en) * | 2013-12-25 | 2015-07-02 | 日東電工株式会社 | Polarizing plate and method for manufacturing polarizing plate |
-
2014
- 2014-07-22 JP JP2014148839A patent/JP6203143B2/en active Active
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2015
- 2015-06-24 CN CN201580040169.2A patent/CN106575009B/en active Active
- 2015-06-24 WO PCT/JP2015/068161 patent/WO2016013342A1/en active Application Filing
- 2015-06-24 KR KR1020177001986A patent/KR101893711B1/en active IP Right Grant
- 2015-07-13 TW TW104122506A patent/TW201605638A/en unknown
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102171122A (en) * | 2008-09-30 | 2011-08-31 | 琳得科株式会社 | Film-peeling method, process for production of optical film, film-peeling mechanism, and apparatus for production of optical film |
| JP2011178523A (en) * | 2010-03-02 | 2011-09-15 | Toppan Printing Co Ltd | Film/thin-film separating and continuous thin-film splicing device |
| CN102834339A (en) * | 2010-03-25 | 2012-12-19 | 住友化学株式会社 | Separation method and separation device |
| CN103201656A (en) * | 2010-11-10 | 2013-07-10 | 住友化学株式会社 | Methods for producing polarizing laminate film and polarizing plate |
| JP2012160885A (en) * | 2011-01-31 | 2012-08-23 | Brother Ind Ltd | Image reader and image forming apparatus |
Also Published As
| Publication number | Publication date |
|---|---|
| TW201605638A (en) | 2016-02-16 |
| KR20170034893A (en) | 2017-03-29 |
| JP6203143B2 (en) | 2017-09-27 |
| WO2016013342A1 (en) | 2016-01-28 |
| JP2016024364A (en) | 2016-02-08 |
| KR101893711B1 (en) | 2018-10-04 |
| CN106575009B (en) | 2019-06-28 |
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