CN110494773A - Optical laminate, polarizing film and image display device - Google Patents

Optical laminate, polarizing film and image display device Download PDF

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Publication number
CN110494773A
CN110494773A CN201880024178.6A CN201880024178A CN110494773A CN 110494773 A CN110494773 A CN 110494773A CN 201880024178 A CN201880024178 A CN 201880024178A CN 110494773 A CN110494773 A CN 110494773A
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China
Prior art keywords
base material
material film
optical laminate
layer
acrylic resin
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CN201880024178.6A
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CN110494773B (en
Inventor
平冈慎哉
岸敦史
上野友德
茂手木佑辅
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Nittosan Engineering Co Ltd
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Nittosan Engineering Co Ltd
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B27/08—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/18—Layered products comprising a layer of synthetic resin characterised by the use of special additives
    • B32B27/20—Layered products comprising a layer of synthetic resin characterised by the use of special additives using fillers, pigments, thixotroping agents
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/30—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/30—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers
    • B32B27/308—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers comprising acrylic (co)polymers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
    • B32B7/02—Physical, chemical or physicochemical properties
    • B32B7/023—Optical properties
    • 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
    • G02B1/10—Optical coatings produced by application to, or surface treatment of, optical elements
    • G02B1/11—Anti-reflection coatings
    • G02B1/111—Anti-reflection coatings using layers comprising organic materials
    • 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
    • G02B1/10—Optical coatings produced by application to, or surface treatment of, optical elements
    • G02B1/14—Protective coatings, e.g. hard coatings
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/02—Diffusing elements; Afocal elements
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2270/00—Resin or rubber layer containing a blend of at least two different polymers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/40—Properties of the layers or laminate having particular optical properties
    • B32B2307/418—Refractive
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/40—Properties of the layers or laminate having particular optical properties
    • B32B2307/42—Polarizing, birefringent, filtering
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2457/00—Electrical equipment
    • B32B2457/20—Displays, e.g. liquid crystal displays, plasma displays

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Nonlinear Science (AREA)
  • Mathematical Physics (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Laminated Bodies (AREA)
  • Polarising Elements (AREA)
  • Surface Treatment Of Optical Elements (AREA)

Abstract

The present invention provides a kind of optical laminate that appearance can be excellent.Optical laminate of the invention includes the base material film containing acrylic resin and the unilateral surface-treated layer for being formed in base material film, wherein, constituting the ratio of ingredient dissolved out from the ingredient for the position that the depth base material film side along the direction of surface-treated layer is 3.0 μm to the acrylic resin of surface-treated layer is 18% or more.

Description

Optical laminate, polarizing film and image display device
Technical field
The present invention relates to optical laminate, polarizing film and image display devices.
Background technique
In recent years, it is known to be formed with hard conating, antiglare layer, anti-in the unilateral side of the base material film made of acrylic resin The optical laminate (patent document 1) of the functional layers such as reflecting layer (surface-treated layer).Such optical laminate is for example available Make the protective film of the polarizer or the front panel of image display device.
Existing technical literature
Patent document
Patent document 1: Japanese Unexamined Patent Publication 2016-218478 bulletin
Summary of the invention
Problems to be solved by the invention
However, previous optical laminate as described above exists in the case where acrylic resin film generates damage The problem of causing the damage obviously to be changed because forming surface-treated layer.Even if such phenomenon is produced in acrylic resin film Can also it occur in the case where the raw fine degree that extremely can not visually arrive of damage, the damage that can not visually arrive is in optics obtained The reason of bad order that can visually arrive can be become in laminated body.
The present invention is carried out to solve above-mentioned previous project, and main purpose is to provide a kind of appearance can be excellent Different optical laminate has the polarizing film of such optical laminate and has the image display device of such polarizing film.
Means for solving the problems
Optical laminate of the invention includes the base material film containing acrylic resin and the list for being formed in above-mentioned base material film The surface-treated layer of side, wherein constituting the depth from above-mentioned base material film side along the direction of above-mentioned surface-treated layer is 3.0 μm Being dissolved out in the ingredient of position to the ratio of the ingredient of the above-mentioned acrylic resin of above-mentioned surface-treated layer is 18% or more.
In one embodiment, the refractive index of above-mentioned base material film is being set as R1, by the refractive index of above-mentioned surface-treated layer It is set as R2, the refractive index at position for being 3.0 μm by the depth from above-mentioned base material film side along the direction of above-mentioned surface-treated layer When being set as R3, meet R3≤0.18R1+0.82R2 (wherein, being set as R1 < R2).
In one embodiment, above-mentioned surface-treated layer with a thickness of 3 μm~20 μm.
In one embodiment, above-mentioned base material film includes above-mentioned acrylic resin and is scattered in above-mentioned acrylic resin In core-shell-type particle.
In one embodiment, above-mentioned base material film relative to above-mentioned 100 parts by weight of acrylic resin contain 3 parts by weight~ The above-mentioned core-shell-type particle of 50 parts by weight.
In one embodiment, above-mentioned acrylic resin has selected from by glutarimide unit, lactone ring element, horse Carry out at least one of the group that anhydride unit, maleimide amine unit and glutaric anhydride unit are constituted.
In one embodiment, above-mentioned surface-treated layer is the hardening of resin layer being coated on above-mentioned base material film.
In one embodiment, above-mentioned surface-treated layer is selected from the group being made of hard conating, antiglare layer and anti-reflecting layer At least one of.
According to another aspect of the present invention, a kind of polarizing film is provided.The polarizing film includes the polarizer and is configured at above-mentioned The unilateral protective layer of inclined device, wherein above-mentioned protective layer is above-mentioned optical laminate.
According to another aspect of the present invention, a kind of image display device is provided.The image display device has above-mentioned polarization Piece.
Invention effect
According to the present invention, by constituting the position that the depth from base material film side along the direction of surface-treated layer is 3.0 μm Ingredient in the ingredient of acrylic resin of dissolution to surface-treated layer be 18% or more, it is possible to provide a kind of appearance can be excellent Optical laminate, the polarizing film for having such optical laminate and the image display device for having such polarizing film.
Detailed description of the invention
Fig. 1 is the summary sectional view of the optical laminate based on one embodiment of the present invention.
Specific embodiment
Hereinafter, embodiments of the present invention will be described, but the present invention is not limited to these embodiments.
A. the overall structure of optical laminate
Fig. 1 is the summary sectional view of the optical laminate based on one embodiment of the present invention.Optical laminate 100 includes Base material film 10 and the unilateral surface-treated layer 20 for being formed in base material film 10.In optical laminate 100, constitute from 10 side of base material film It rises and dissolves out along the ingredient for the position that the depth in the direction of surface-treated layer 20 is 3.0 μm to the acrylic acid series tree of surface-treated layer The ratio of the ingredient of rouge is 18% or more.The position that the so-called depth from base material film side along the direction of surface-treated layer is 3.0 μm It sets, is the position for leaving 3.0 μm along the direction of surface-treated layer side from the interface of base material film and surface-treated layer for representative It sets.It is exported for the proportional representation of the ingredient of the acrylic resin of above-mentioned " position of 3 μm of depth " by following methods.
Calculating position (position away from surface treatment side)=surface-treated layer thickness (PET base of acrylic resin ingredient Material hard coat layer thickness)-(3 μm)
For example, measuring third away from the surface treatment 12 μm of positions in side in the case where (PET base material hard coat layer thickness) is 15 μm The ratio of olefin(e) acid system resin component.It is exported for surface-treated layer thickness (hard coat layer thickness) is representative by following step. First, using PET base material, (Toray company is manufactured, trade name: U48-3, refractive index: 1.60) base material film is used as, in coating layer UV hardening is dried and carried out at 70 DEG C of heating temperature, thus to obtain the optical laminate for being formed with hard conating.Via thickness Degree for 20 μm acrylic adhesive by black acrylic system resin plate (Mitsubishi Rayon company manufacture, with a thickness of 2mm) it is pasted onto the substrate layer side of optical laminate obtained.Then, using moment multichannel photometric system, (big tomb electronics is public Department's manufacture, trade name: MCPD3700), the reflectance spectrum of hard conating is measured under the following conditions.Due to hard conating formation group Closing object will not infiltrate into PET base material used in these laminated bodies, therefore according to the FFT (Fast obtained by laminated body Fourier transform, Fast Fourier Transform) spectrum peak position, determine the thickness of only hard conating.
Reflection spectrum measuring condition
Reference: reflecting mirror
Algorithm: FFT method
Calculate wavelength: 450nm~850nm
Testing conditions
Time for exposure: 20ms
Lamp gain (LampGain): normal
Cumulative number: 10 times
FFT method
The range of film thickness value: 2~15 μm
Film thickness resolution ratio: 24nm
Aforementioned proportion is preferably 18%~30%, and more preferably 18.5%~25%.It constitutes from 10 side of base material film along table The depth in the direction of surface treatment layer 20 be 3.0 μm position ingredient in dissolution to surface-treated layer acrylic resin at The ratio divided can be for example measured by prism coupling.Specifically, the refractive index of base material film is set as R1, by surface The refractive index of process layer is set as R2, by by prism coupling measure from base material film side along the depth in the direction of surface-treated layer When degree is set as R3 for the refractive index at 3.0 μm of position, the depth for constituting the direction from base material film side along surface-treated layer is The ratio X (%) to the ingredient of the acrylic resin of surface-treated layer is dissolved out in the ingredient of 3.0 μm of position with following formula Subrepresentation.
X (%)=(R3-R2) × 100/ (R1-R2)
Therefore, the refractive index R1 of optical laminate 100 and base material film, the refractive index R2 of surface-treated layer and from base material film side The refractive index R3 risen along the position that the depth in the direction of surface-treated layer is 3.0 μm is related, preferably satisfies inequality below.
R3≤0.18R1+0.82R2(R1<R2)
The thickness of surface-treated layer is preferably 3 μm~20 μm, more preferably 5 μm~15 μm.In one embodiment, substrate Film 10 includes acrylic resin and the core-shell-type particle being scattered in acrylic resin.In this case, base material film 10 is excellent Phase selection contains 3 parts by weight~50 parts by weight core-shell-type particle for 100 parts by weight of acrylic resin.Acrylic resin is excellent Choosing has selected from by glutarimide unit, lactone ring element, maleic anhydride units, maleimide amine unit and glutaric anhydride list At least one of the group that member is constituted.It is the resin combination being coated on base material film 10 for 20 representativeness of surface-treated layer Hardened layer.Surface-treated layer 20 is preferably selected from least one of the group being made of hard conating, antiglare layer and anti-reflecting layer.With Toward optical laminate exist due to the base material film of strip is wound on roller along longitudinal direction generate damage because in base The case where material film forms surface-treated layer and obviously changes.In contrast, optical laminate 100 according to the present invention, base material film 10 The amount of dissolution of contained acrylic resin to surface-treated layer 20 is fully more.It is can inhibit as a result, because in the formation of base material film 10 Obviousization of the damage of base material film 10 caused by surface-treated layer 20.In turn, base material film 10 and surface-treated layer 20 can be improved Adaptation.
B. base material film
B-1. the characteristic of base material film
Base material film contains acrylic resin as described above.In one embodiment, base material film includes acrylic resin With the core-shell-type particle being scattered in acrylic resin.The thickness of base material film is preferably 5 μm~150 μm, more preferably 10 μm ~100 μm.When forming surface-treated layer described below, acrylic resin can be dissolved out to surface-treated layer base material film.It is logical It crosses acrylic resin to dissolve out to surface-treated layer, constituting the depth from base material film side along the direction of surface-treated layer is 3.0 μ The ratio of the ingredient of acrylic resin becomes 18% or more in the ingredient of the position of m.
Base material film preferably substantially has optical isotropy.In the present specification, so-called " substantially to have optics each To the same sex " refer in face phase difference Re (550) be 0nm~10nm and the phase difference Rth (550) of thickness direction be -10nm~+ 10nm.Phase difference Re (550) is more preferably 0nm~5nm, further preferably 0nm~3nm in face, and particularly preferably 0nm~ 2nm.The phase difference Rth (550) of thickness direction is more preferably -5nm~+5nm, further preferably -3nm~+3nm, especially excellent It is selected as -2nm~+2nm.If the Re (550) and Rth (550) of base material film are such range, it is applied to by optical laminate The adverse effect to display characteristic can be prevented in the case where image display device.It should be noted that Re (550) is at 23 DEG C Phase difference in the face of the film obtained by the light measurement of wavelength 550nm.Re (550) can pass through formula: Re (550)=(nx-ny) × d is asked Out.Rth (550) is the phase difference of the thickness direction of the film obtained by the light measurement of wavelength 550nm at 23 DEG C.Rth (550) can Pass through formula: Rth (550)=(nx-nz) × d is found out.Wherein, nx is that the refractive index in face becomes maximum direction (that is, slow axis side To) refractive index, ny is the refractive index of orthogonal with slow axis direction in face (that is, fast axis direction), and nz is the folding of thickness direction Rate is penetrated, d is the thickness (nm) of film.
Base material film with a thickness of 40 μm when 380nm under light transmittance it is more high the more preferred.Specifically, light transmits Rate is preferably 85% or more, and more preferably 88% or more, further preferably 90% or more.If light transmittance is such model It encloses, then can ensure that the desired transparency.Light transmittance can for example be measured by the method according to ASTM-D-1003.
The the mist degree of base material film the low the more preferred.Specifically, mist degree be preferably 5% hereinafter, more preferably 3% hereinafter, into One step is preferably 1.5% hereinafter, particularly preferably 1% or less.If mist degree be 5% hereinafter, if can to film assign it is good transparent Sense.In turn, even if in the case where optical laminate to be used as to the protective layer of visual confirmation side polarizing film of image display device, Visual confirmation it can also show content well.
Base material film with a thickness of 40 μm when YI (Yellowness Index, yellowness index) be preferably 1.27 hereinafter, more Preferably 1.25 hereinafter, further preferably 1.23 hereinafter, particularly preferably 1.20 or less.If YI is more than 1.3, there are optics The case where transparency becomes inadequate.It should be noted that YI for example can be according to by using high speed integrating sphere type spectral transmission The measurement color obtained of measuring machine (trade name DOT-3C: in village color technical research institute manufacture) tristimulus values (X, Y, Z), found out by following formula.
YI=[(1.28X-1.06Z)/Y] × 100
Base material film with a thickness of 40 μm when b value (scales of the form and aspect according to special (Hunter) colour system of the Chinese) preferably Lower than 1.5, more preferably 1.0 or less.In the case where b value is 1.5 or more, there are the feelings for not desired tone occur Condition.It should be noted that b value can be for example divided saturating by being 3cm square by substrate membrane sample severing using high speed integrating sphere type Rate measuring machine (trade name DOT-3C: color technical research institute manufactures in village) measurement form and aspect are penetrated, and are commented according to Chinese spy's colour system The valence form and aspect and obtain.
The moisture permeability of base material film is preferably 300g/m224 hours hereinafter, more preferably 250g/m224 hours hereinafter, into One step is preferably 200g/m224 hours hereinafter, particularly preferably 150g/m224 hours hereinafter, most preferably 100g/m2· 24 hours or less.If the moisture permeability of base material film is such range, in the case where being used as the protective layer of the polarizer, can get Durability and the excellent polarizing film of moisture-proof.
The tensile strength of base material film is preferably 10MPa more than or lower than 100MPa, more preferably 30MPa more than or lower than 100MPa.In the case where being lower than 10MPa, there is the case where can not showing sufficient mechanical strength.If more than 100MPa, It is possible that processability becomes inadequate.Tensile strength can for example be measured according to ASTM-D-882-61T.
The tensile elongation of base material film is preferably 1.0% or more, and more preferably 3.0% or more, further preferably 5.0% More than.The upper limit of tensile elongation is, for example, 100%.In the case where tensile elongation is lower than 1%, become not fill there are toughness The case where dividing.Tensile elongation can for example be measured according to ASTM-D-882-61T.
The tensile modulus of elasticity of base material film is preferably 0.5GPa or more, more preferably 1GPa or more, further preferably 2GPa or more.The upper limit of tensile modulus of elasticity is, for example, 20GPa.In the case where tensile modulus of elasticity is lower than 0.5GPa, exist The case where can not showing sufficient mechanical strength.Tensile modulus of elasticity can for example be measured according to ASTM-D-882-61T.
Base material film can also contain any suitable additive according to purpose.As the specific example of additive, can enumerate Ultraviolet absorbing agent out；The antioxidants such as hindered phenolic, phosphorus system, sulphur system；Resistance to light stabilizer, weathering stabilizers, heat stabilizer etc. Stabilizer；The reinforcing materials such as glass fibre, carbon fiber；Near infrared ray absorption；Tricresyl phosphate (dibromopropyl) ester, tricresyl phosphate allyl The fire retardants such as ester, antimony oxide；The antistatic agents such as the surfactant of anionic system, cationic system, nonionic system；Inorganic pigment, The colorants such as organic pigment, dyestuff；Organic filler or inorganic filler；Resin modification agent；Organic filler or inorganic filler；Increase Mould agent；Lubricant etc..Additive can be added in the polymerization of acrylic resin, can also be added in film formation.Additive Type, quantity, combination, additive amount etc. can be suitably set according to purpose.
B-2. acrylic resin
B-2-1. the composition of acrylic resin
As acrylic resin, any suitable acrylic resin can be used.In acrylic resin, it is representative and Speech, as monomeric unit, contains (methyl) alkyl acrylate as main component.In the present specification, so-called " (methyl) third Olefin(e) acid " refers to acrylic acid and/or methacrylic acid.(methyl) acrylic acid alkyl as the main framing for constituting acrylic resin Ester can exemplify (methyl) alkyl acrylate that the carbon number of the alkyl of straight-chain or branched is 1~18.They can individually make With or combination and use.In turn, any suitable comonomer can also be imported in acrylic resin by copolymerization.In this way Type, quantity, the copolymerization ratio of comonomer etc. can be suitably set according to purpose.Main framing about acrylic resin Constituent (monomeric unit) is described below with reference to general formula (2).
Acrylic resin preferably has selected from glutarimide unit, lactone ring element, maleic anhydride units, Malaysia acyl At least one of imines unit and glutaric anhydride unit.Acrylic resin with lactone ring element is for example documented in Japan In special open 2008-181078 bulletin, the record of the bulletin is quoted in this manual as reference.Glutarimide unit It is preferred that being indicated with the following general formula (1):
In general formula (1), R1And R2Separately indicate the alkyl that hydrogen atom or carbon number are 1~8, R3Expression hydrogen atom, The aryl that the naphthenic base or carbon number that alkyl that carbon number is 1~18, carbon number are 3~12 are 6~10.In general formula (1), preferably R1 And R2It is separately hydrogen atom or methyl, and R3For hydrogen atom, methyl, butyl or cyclohexyl.More preferable R1For methyl, R2 For hydrogen atom, and R3For methyl.
It is indicated for above-mentioned (methyl) alkyl acrylate is representative with the following general formula (2):
In general formula (2), R4Indicate hydrogen atom or methyl, R5It indicates hydrogen atom or the carbon number that can be substituted is 1~6 Aliphatic or alicyclic type hydrocarbon.As substituent group, such as halogen, hydroxyl can be enumerated.As (methyl) alkyl acrylate Specific example can enumerate (methyl) methyl acrylate, (methyl) ethyl acrylate, (methyl) n-propyl, (methyl) N-butyl acrylate, (methyl) tert-butyl acrylate, (methyl) the just own ester of acrylic acid, (methyl) cyclohexyl acrylate, (methyl) Acrylic acid chloromethyl ester, (methyl) acrylic acid 2- chloroethene ester, (methyl) acrylic acid 2- hydroxy methacrylate, (methyl) acrylic acid 3- hydroxyl third Ester, the own ester of (methyl) acrylic acid 2,3,4,5,6- penta hydroxy group and (methyl) acrylic acid 2,3,4,5- tetrahydroxy pentyl ester.In general formula (2) In, R5Preferably hydrogen atom or methyl.It is therefore especially preferred that (methyl) alkyl acrylate be methyl acrylate or methyl-prop E pioic acid methyl ester.
Above-mentioned acrylic resin can only contain single glutarimide unit, containing in above-mentioned general formula (1) R1、R2And R3Different a variety of glutarimide units.
The content ratio of glutarimide unit in above-mentioned acrylic resin is preferably 2 moles of %~50 mole %, More preferably 2 moles of %~45 mole %, further preferably 2 moles of %~40 mole %, particularly preferably 2 moles of %~35 Mole %, most preferably 3 moles of %~30 mole %.If content ratio is less than 2 moles of %, it is likely that will not fully play Effect (such as higher optical characteristics, higher mechanical strength and the polarizer shown from glutarimide unit Excellent cementability, slimming).If content ratio is more than 50 moles of %, it is likely that such as heat resistance, hyalinosis obtains not Sufficiently.
Above-mentioned acrylic resin can only contain single (methyl) acrylate unit, can also contain above-mentioned general formula (2) R in4And R5Different a variety of (methyl) acrylate units.
The content ratio of (methyl) acrylate unit in above-mentioned acrylic resin be preferably 50 moles of %~ 98 moles of %, more preferably 55 moles of %~98 mole %, further preferably 60 moles of %~98 mole %, particularly preferably 65 moles of %~98 mole %, most preferably 70 moles of %~97 mole %.If content ratio is less than 50 moles of %, it is likely that Will not fully play from (methyl) acrylate unit and show effect (such as higher heat resistance, compared with The high transparency).If above-mentioned content ratio is more than 98 moles of %, it is likely that resin becomes fragile and is easy cracking, is unable to fully ground Play higher mechanical strength, producing rate variance.
Other than above-mentioned acrylic resin is containing glutarimide unit and (methyl) acrylate unit Unit.
In one embodiment, acrylic resin, which contains, has neither part nor lot in intramolecular imidization reaction described below Unsaturated carboxylic acid unit such as 0~10 weight %.The content ratio of unsaturated carboxylic acid unit is preferably 0~5 weight %, more preferably For 0~1 weight %.If content is such range, the transparency can be maintained, be detained stability and moisture-proof.
In one embodiment, acrylic resin contains the vinyl monomer list other than the above being copolymerized First (other vinyl monomer units).As other vinyl monomers, such as acrylonitrile, metering system can be enumerated Nitrile, ethyl acrylonitrile, allyl glycidyl ether, maleic anhydride, itaconic anhydride, N- methylmaleimido, N- ethyl Malaysia Acid imide, N- N-cyclohexylmaleimide, acrylate, acrylic acid propylcarbamic ethyl ester, dimethylaminoethyl acrylate methyl ammonia Base ethyl ester, methacrylic acid ethylamino propyl ester, methacrylic acid Cyclohexylamino ethyl ester, N- vinyl diethylamide, N- second Acyl group vinyl amine, allyl amine, methacrylic amine, N- methacrylic amine, 2- isopropenyl oxazoline, 2- vinyl are disliked Oxazoline, 2- acryloyl group oxazoline, N-phenylmaleimide, methacrylic acid phenyl amino ethyl ester, styrene, Alpha-Methyl benzene Ethylene, to glycidyl styrene, p-aminophenyl ethylene, 2- styryl oxazoline etc..They can be used alone, can also be simultaneously With.The preferably styrenic monomers such as styrene, α-methylstyrene.The content ratio of other vinyl monomer units is preferred For 0~1 weight %, more preferably 0~0.1 weight %.If such range, then it can inhibit not desired phase difference Performance and the reduction of the transparency.
Acid imide rate in above-mentioned acrylic resin is preferably 2.5%~20.0%.If acid imide rate is in this way Range, then can get heat resistance, the transparency and the excellent resin of molding processibility, the generation burnt when can prevent film from forming Or the reduction of mechanical strength.In above-mentioned acrylic resin, acid imide rate is with glutarimide unit and (methyl) propylene The ratio between acid alkyl ester unit indicates.The ratio such as can be according to NMR (the nuclear magnetic of acrylic resin Resonance, nuclear magnetic resonance) spectrum, IR (infrared, infrared ray) spectrum etc. and obtain.In the present embodiment, acid imide Rate can be used1HNMR BRUKER AvanceIII (400MHz), passes through resin1H-NMR is measured and is found out.It is more specific and Speech, by the O-CH from (methyl) alkyl acrylate near 3.5 to 3.8ppm3The peak area of proton is set as A, by 3.0 The N-CH from glutarimide near to 3.3ppm3The peak area of proton is set as B, is found out by following formula.
Acid imide rate Im (%)={ B/ (A+B) } × 100
The acid value of above-mentioned acrylic resin is preferably 0.10mmol/g~0.50mmol/g.If acid value is such model It encloses, then can get the resin of the balancing good of heat resistance, mechanical properties and molding processibility.If acid value is too small, exists and generate Because caused by using the modifying agent for being adjusted to desired acid value cost improve, because modifying agent remaining caused by gel The case where the problems such as generation of object.If acid value is excessive, there is the hair become easy when (such as when melting extrusion) cause film to form The tendency steeped and the productivity of molded product is caused to reduce.About above-mentioned acrylic resin, acid value is in the acrylic resin Carboxylic acid and carboxylic acid anhydrides unit content.In the present embodiment, acid value can for example pass through WO2005/054311 or Japan Titration documented by special open 2005-23272 bulletin and calculate.
The weight average molecular weight of above-mentioned acrylic resin is preferably 1000~2000000, more preferably 5000~ 1000000, further preferably 10000~500000, particularly preferably 50000~500000, most preferably 60000~ 150000.Gel permeation chromatograph (GPC system, Tosoh manufacture) for example can be used in weight average molecular weight, is converted by polystyrene And it finds out.It should be noted that can be used tetrahydrofuran as solvent.
The Tg (glass transition temperature) of above-mentioned acrylic resin is preferably 110 DEG C or more, more preferably 115 DEG C with On, further preferably 120 DEG C or more, particularly preferably 125 DEG C or more, most preferably 130 DEG C or more.If Tg be 110 DEG C with On, then the polarizing film containing the base material film obtained by such resin easily becomes the polarizing film of excellent in te pins of durability.The upper limit of Tg Value preferably 300 DEG C hereinafter, more preferably 290 DEG C hereinafter, further preferably 285 DEG C hereinafter, particularly preferably 200 DEG C with Under, most preferably 160 DEG C or less.If Tg is such range, mouldability can be excellent.
B-2-2. the polymerization of acrylic resin
Above-mentioned acrylic resin can for example be manufactured by the following method.This method comprises: (I) will be with general formula (2) institute Indicate corresponding (methyl) alkyl acrylate monomer of (methyl) acrylate unit and unsaturated carboxylic acid monomer and/ Or its precursor monomer is copolymerized and obtains copolymer (a)；And (II) handles the copolymer (a) using acid imide agent, thus Carry out (methyl) alkyl acrylate monomer units and unsaturated carboxylic acid monomer and/or its precursor monomer in the copolymer (a) Glutarimide unit represented by general formula (1) is directed into copolymer by the intramolecular imidization reaction of unit.
As unsaturated carboxylic acid monomer, for example, can enumerate acrylic acid, methacrylic acid, crotonic acid, alpha-substituted acrylic acid, Alpha-substituted methacrylic acid.As its precursor monomer, such as acrylamide, Methacrylamide can be enumerated etc..They can be single It solely uses, can also be used in combination.Preferred unsaturated carboxylic acid monomer is acrylic or methacrylic acid, and preferred precursor monomer is propylene Amide.
As the method handled using acid imide agent copolymer (a), any suitable method can be used.As Specific example can enumerate the method using extruder, using the method for batch-type reactive tank (pressure vessel).Use extruder Method include being handled it by copolymer (a) heating melting, and using acid imide agent using extruder.In the situation Under, as extruder, any suitable extruder can be used.As specific example, single screw extrusion machine, twin-screw can be enumerated Extruder, multi-screw extruder.Any suitable batch-type can be used in method using batch-type reactive tank (pressure vessel) Reactive tank (pressure vessel).
As acid imide agent, as long as producing glutarimide unit represented by above-mentioned general formula (1), it may be used and appoint It anticipates compound appropriate.As the specific example of acid imide agent, methylamine, ethamine, n-propylamine, isopropylamine, positive fourth can be enumerated The amine containing aliphatic alkyl such as amine, isobutyl amine, tert-butylamine, n-hexylamine；Aniline, benzylamine, toluidines, trichloroaniline etc. contain virtue The amine of fragrant race's alkyl；The amine containing alicyclic type hydrocarbon such as cyclohexylamine.In turn, for example, can also be used generated by heating it is such The urea based compound of amine.As carbamide compound, such as urea, 1,3- dimethyl urea, 1,3- diethyl urea, 1,3- dipropyl can be enumerated Base urea.Acid imide agent is preferably methylamine, ammonia, cyclohexylamine, more preferably methylamine.
In imidizate, other than above-mentioned acid imide agent, closed loop promotor can also be added as needed.
The usage amount of acid imide agent in imidizate is relative to 100 parts by weight of copolymer (a), preferably 0.5 weight Part~10 parts by weight, more preferably 0.5 parts by weight~6 parts by weight.If the usage amount of acid imide agent is less than 0.5 parts by weight, The case where not reaching desired acid imide rate is more.As a result, there are the heat resistances of resin obtained to become pole not Sufficiently induce the case where open defects such as burning after molding.If the usage amount of acid imide agent is more than 10 parts by weight, deposit The remaining acid imide agent in resin and by the acid imide agent be induced into after type the case where the open defects or foaming such as burning.
The manufacturing method of present embodiment may also comprise as needed other than above-mentioned imidizate utilizes esterifying agent institute The processing of progress.
As esterifying agent, such as dimethyl carbonate, 2,2-dimethoxypropane, dimethyl sulfoxide, orthoformic acid can be enumerated Triethyl, trimethyl orthoacetate, trimethyl orthoformate, diphenyl carbonate, dimethyl suflfate, methyl tosylate, trifluoro methylsulphur Sour methyl esters, methyl acetate, methanol, ethyl alcohol, methyl isocyanate, p-chlorophenyl isocyanate, dimethyl carbon imidodicarbonic diamide, dimethyl uncle Butyl silyl chloride, methylvinyl acetate, dimethyl urea, tetramethyl ammonium hydroxide, dimethyl diethoxysilane, four positive fourths Oxysilane, dimethylphosphite (trimethyl silane) ester, Trimethyl phosphite, trimethyl phosphate, tricresyl phosphate, diazonium Methane, ethylene oxide, propylene oxide, 7-oxa-bicyclo[4.1.0,2- hexyl glycidyl ether, phenyl glycidyl ether, benzyl contracting Water glycerin ether.In them, from the viewpoints such as cost and reactivity, preferably dimethyl carbonate.
The additive amount of esterifying agent can be set in such a way that the acid value of acrylic resin becomes desired value.
B-2-3. other resins are used in combination
In embodiments of the present invention, above-mentioned acrylic resin and other resins can be used in combination.That is, third can will be constituted The monomer component of olefin(e) acid system resin is copolymerized with the monomer component for constituting other resins, and by the copolymer for hereafter B-4 Film described in is formed；The blend of acrylic resin and other resins can also be formed for film.As other resins, example Phenylethylene resin series, polyethylene, polypropylene, polyamide, polyphenylene sulfide, polyether-ether-ketone, polyester, polysulfones, polyphenyl can such as be enumerated Other thermoplastic resins such as ether, polyacetals, polyimides, polyetherimide；Phenol resin, melamine series resin, Polyester The thermosetting resins such as resin, organic silicon-type resin, epoxy system resin.Resin type and use level can be according to mesh And desired characteristic of film obtained etc. is suitably set.For example, phenylethylene resin series (preferably acrylonitrile-benzene second Alkene copolymer) it can be used as retardation controlling agent and be used in combination.
In the case where acrylic resin and other resins are used in combination, the blend of acrylic resin and other resins In the content of acrylic resin be preferably the 50 weight % of weight %~100, the more preferably 60 weight % of weight %~100, The further preferably 70 weight % of weight %~100, particularly preferably 80 weight of weight %~100 %.It is lower than 50 weights in content In the case where measuring %, it is possible to reflect acrylic resin higher heat resistance inherently, higher with being unable to fully The transparency.
B-3. core-shell-type particle
In above-mentioned base material film, core-shell-type particle is relative to 100 parts by weight of acrylic resin, and cooperating is preferably 3 weights Measure part~50 parts by weight, more preferably 5 parts by weight~25 parts by weight, further preferably 7 parts by weight~15 parts by weight.As a result, Promotion forms the acrylic resin of base material film to the dissolution of surface-treated layer, as a result, propylene can be formed on base material film The higher compatibility layer of uniformity of the composition of acid system resin and composition surface-treated layer.It is can inhibit as a result, because in base material film shape At obviousization of substrate membrane damage caused by surface-treated layer.In turn, the adaptation of base material film and surface-treated layer can be improved.
There is the core being made of rubber-like polymer for core-shell-type particle is representative and be made of glassy polymers and Cover the coating of the core.Core-shell-type particle also can have layer that one layer or more is made of glassy polymers as innermost layer Or middle layer.
The Tg for constituting the rubber-like polymer of core is preferably 20 DEG C hereinafter, being more preferably -60 DEG C~20 DEG C, further preferably It is -60 DEG C~10 DEG C.If the Tg for constituting the rubber-like polymer of core is more than 20 DEG C, it is likely that the machinery of acrylic resin is strong The raising of degree is insufficient.The Tg for constituting the glassy polymers (rigid polymer) of coating is preferably 50 DEG C or more, more preferably It is 50 DEG C~140 DEG C, further preferably 60 DEG C~130 DEG C.If the Tg for constituting the glassy polymers of coating is lower than 50 DEG C, Then it is possible that the heat resistance of acrylic resin reduces.
The content ratio of core in core-shell-type particle is preferably the 30 weight % of weight %~95, and more preferably 50 weight %~ 90 weight %.The ratio of glassy polymeric nitride layer in core is 0~60 weight % relative to the 100 weight % of total amount of core, preferably For 0~45 weight %, more preferably 10 weight of weight %~40 %.The content ratio of coating in core-shell-type particle is preferably The 5 weight % of weight %~70, more preferably 10 weight of weight %~50 %.
In one embodiment, the core-shell-type particle being scattered in acrylic resin can have flat pattern.Core-shell-type Flattening and particle stretching described in hereafter B-4.The ratio between the length/thickness of core-shell-type particle through flattening is 7.0 following.The ratio between length/thickness is preferably 6.5 hereinafter, more preferably 6.3 or less.On the other hand, the ratio between length/thickness is preferred It is 4.0 or more, more preferably 4.5 or more, further preferably 5.0 or more.In the present specification, so-called " length/thickness it Than " refer to core-shell-type particle plan view shape representative length and the ratio between thickness.Wherein, so-called " representing length " overlooks shape Shape is to refer to diameter in circular situation, refers to major diameter in the case of an ellipse, refers in the case where rectangle or polygon Cornerwise length.The ratio can such as be found out according to following step.Using transmission electron microscope, (such as acceleration voltage is 80kV、RuO4Dyeing ultrathin sectioning) film section obtained is shot, from the core shell being present in photo obtained Successively choose 30 in longer particle (obtaining the particle close to the section for representing length) in type particle, calculate (length it is flat Mean value)/(average value of thickness), it thus can get the ratio.
It constitutes the rubber-like polymer of the core of core-shell-type particle, constitute the glassy polymers (rigid polymeric of coating Object), they polymerization and other constitute detailed contents be for example documented in Japanese Unexamined Patent Publication 2016-33552 bulletin.It should The record of bulletin is quoted in this manual as reference.
B-4. the formation of base material film
It can be by including that will contain above-mentioned acrylic acid series tree for base material film based on embodiments of the present invention is representative Rouge (being the blend with other resins in the case where other resins) and the composition of core-shell-type particle form film Method and formed.In turn, the method for forming base material film may include stretching above-mentioned film.
The average grain diameter that film forms used core-shell-type particle is preferably 1nm~500nm.The average grain diameter of core is preferably 50nm~300nm, more preferably 70nm~300nm.
As the method for forming film, any suitable method can be used.As specific example, curtain coating finishing can be enumerated (such as the tape casting), extrusion moulding, injection moulding, compression forming methods, transfer moudling, blow molding method, powder compacting Method, FRP (Fiber Reinforced Plastic, fiber-reinforced plastic) method of forming, rolling-molding method, pressure sintering.Preferably Extrusion moulding or curtain coating finishing.Its reason is: the flatness of film obtained can be improved, it is equal to can get good optics One property.Particularly preferably extrusion moulding.Its reason is without considering the problems of to cause because of residual solvents.Wherein, using T mould Extrusion moulding from the viewpoint of the productivity of film and the easiness of later stretch processing preferably.Condition of molding can basis The composition or type of used resin suitably set desired characteristic of film obtained etc..
As drawing process, can be used any suitable drawing process, stretching condition (such as draft temperature, stretching ratio, Tensile speed, draw direction).As the specific example of drawing process, free end stretching can be enumerated, fixing end stretches, freely End is shunk, fixing end is shunk.They can be used alone, and also can be used simultaneously, and can also gradually use.By in suitable tension bar Appropriate adjustment core-shell-type particle is stretched relative to the film of the use level of acrylic resin under part, and promotes acrylic acid It is dissolution of the resin to surface-treated layer, is surface-treated as a result, acrylic resin can be formed on base material film and constituted The higher compatibility layer of uniformity of the composition of layer.
Draw direction can use suitable direction according to purpose.Specifically, length direction, width side can be enumerated To, thickness direction, inclined direction.Draw direction can be a direction (being uniaxially stretched), can also be two directions (biaxial stretch-formed), can also More than three directions.In embodiments of the present invention, for representative, being uniaxially stretched of length direction, length side can be used To and while width direction biaxial stretch-formed, length direction and width direction it is gradually biaxial stretch-formed.It is preferably biaxial stretch-formed (same When or gradually).Its reason is: being easy to control phase difference in face, optical isotropy easy to accomplish.
Draft temperature can be according to the desired optical characteristics of base material film, mechanical property and thickness, used resin Type, the thickness of used film, drawing process (being stretched uniaxially or biaxially), stretching ratio, tensile speed etc. and change. Specifically, draft temperature is preferably Tg~Tg+50 DEG C, further preferably Tg+15 DEG C~Tg+50 DEG C, most preferably Tg+35 DEG C~Tg+50 DEG C.By being stretched at such temperatures, the base material film with suitable characteristic can get.It is specific to draw Stretching temperature is, for example, 110 DEG C~200 DEG C, preferably 120 DEG C~190 DEG C.If draft temperature is such range, by appropriate Stretching ratio and tensile speed are adjusted, and promotes dissolution of the acrylic resin to surface-treated layer, as a result, can be in substrate Acrylic resin is formed on film and constitutes the higher compatibility layer of uniformity of the composition of surface-treated layer.
In addition, stretching ratio also can be according to optical characteristics, mechanical property and thickness, used in the same manner as draft temperature The type of resin, the thickness of used film, drawing process (being stretched uniaxially or biaxially), draft temperature, tensile speed etc. And change.Using biaxial stretch-formed, the stretching ratio of width direction (TD) and the stretching ratio of length direction (MD) The ratio between (TD/MD) be preferably 1.0~1.5, more preferably 1.0~1.4, further preferably 1.0~1.3.In addition, using twin shaft Face multiplying power (product of the stretching ratio of the stretching ratio and width direction of length direction) in the case where stretching is preferably 2.0~ 6.0, more preferably 3.0~5.5, further preferably 3.5~5.2.If stretching ratio is such range, by suitably adjusting Whole draft temperature and tensile speed, and promote dissolution of the acrylic resin to surface-treated layer, as a result, can be in base material film The higher compatibility layer of uniformity of the upper composition for forming acrylic resin and constituting surface-treated layer.
In addition, tensile speed also can be according to optical characteristics, mechanical property and thickness, used in the same manner as draft temperature The type of resin, the thickness of used film, drawing process (being stretched uniaxially or biaxially), draft temperature, stretching ratio etc. And change.Tensile speed is preferably 3%/second~20%/second, more preferably 3%/second~15%/second, further preferably 3%/ Second~10%/second.Using biaxial stretch-formed, the tensile speed in a direction can be identical with the tensile speed of other direction It can also be different.If tensile speed is such range, by appropriate adjustment draft temperature and stretching ratio, and promote acrylic acid It is dissolution of the resin to surface-treated layer, is surface-treated as a result, acrylic resin can be formed on base material film and constituted The higher compatibility layer of uniformity of the composition of layer.
Base material film can be formed in the above described manner.
C. surface-treated layer
Surface-treated layer is any appropriate of the unilateral side that basis is formed in base material film to the function of optical laminate requirement Functional layer.As the specific example of surface-treated layer, hard conating, antiglare layer and anti-reflecting layer etc. can be enumerated.Surface treatment The thickness of layer is preferably 3 μm~20 μm, more preferably 5 μm~15 μm.
It is the hardened layer for the resin combination being formed on base material film for surface-treated layer is representative.Form surface treatment Layer process can include: the resin combination of coating surface process layer formation on base material film and form coating layer；And it will be upper Coating layer is stated to be dried and it is made to harden and surface-treated layer is made.Above-mentioned coating layer is dried and wrap its hardening can Include the above-mentioned coating layer of heating.
As the coating method of resin combination, any suitable method can be used.Such as stick coating method, roller coating can be enumerated Method, gravure coating process, rod-type rubbing method, hole seam rubbing method, curtain coating processes, jetting type rubbing method, comma rubbing method.From making From the perspective of coating becomes easy, resin combination preferably comprises the solvent of dilution.
The heating temperature of coating layer may be set to any suitable temperature corresponding with the composition of resin combination, preferably set It is set to the glass transition temperature of acrylic resin contained by base material film or less.If the acrylic resin contained by base material film Glass transition temperature temperature below under heated, then can get the optics stacking that deformation is able to inhibit caused by heating Body.The heating temperature of coating layer is, for example, 50 DEG C~140 DEG C, preferably 60 DEG C~100 DEG C.By under such heating temperature It is heated, can get the optical laminate of the excellent adhesion of base material film and surface-treated layer.
C-1. hard conating
Hard conating is the layer that marresistance and chemical-resistant etc. are assigned to the surface of base material film.Hard conating is in pencil hardness There is the hardness of preferably H or more, more preferably 3H or more in test.Pencil hardness test can be surveyed according to JIS K 5400 It is fixed.The resin combination of hard conating formation can for example contain can be hard by heat, light (ultraviolet light etc.) or electron ray etc. The hardenability compound of change.The detailed content of hard conating and the resin combination of hard conating formation is for example documented in Japanese Unexamined Patent Publication In 2014-240955 bulletin.Whole records of the bulletin are quoted in this manual as reference.
C-2. antiglare layer
Antiglare layer is the layer mirrored for preventing ambient light and making light scatter and reflect.The tree of antiglare layer formation Oil/fat composition is for example containing the hardenability compound that can pass through the hardening such as hot, light (ultraviolet light etc.) or electron ray.It is anti- There is micro concavo-convex shape on surface for dizzy layer is representative.As the method for forming such micro concavo-convex shape, such as can Above-mentioned hardenability compound of sening as an envoy to is enumerated containing fine-grained method.Antiglare layer and the resin combination of antiglare layer formation it is detailed Content is for example documented in Japanese Unexamined Patent Publication 2017-32711 bulletin.Whole records of the bulletin are quoted as reference in this In bright book.
C-3. anti-reflecting layer
Anti-reflecting layer is the layer for preventing the reflection of ambient light.The resin combination of anti-reflecting layer formation can for example contain Having can be by the hardenability compound of the hardening such as heat, light (ultraviolet light etc.) or electron ray.Anti-reflecting layer can be for only by 1 layer The single layer of composition can also be the multilayer comprising 2 layers or more.Anti-reflecting layer and the resin combination of anti-reflecting layer formation it is detailed Content is for example documented in Japanese Unexamined Patent Publication 2012-155050 bulletin.Whole records of the bulletin are quoted as reference in this In specification.
D. polarizing film
Optical laminate documented by above-mentioned A to C can be applied to polarizing film.Therefore, the present invention also includes using in this way Optical laminate polarizing film.For representativeness, polarizing film has the polarizer and is configured at the unilateral present invention of the polarizer Optical laminate.Optical laminate is that its base material film side is bonded with the polarizer, can be used as the protective layer of the polarizer and plays function Energy.
As the polarizer, any suitable polarizer can be used.For example, the resin film for forming the polarizer can be the tree of single layer Adipose membrane can also be two layers or more of laminated body.
As the specific example for the polarizer being made of the resin film of single layer, can enumerate to polyvinyl alcohol (PVA) mesentery, The hydrophilic macromolecule films such as part formalizing PVA mesentery, the partly-hydrolysed film of vinyl-vinyl acetate copolymer system are implemented to utilize The polarizer obtained from the dyeing processing and stretch processing of the dichroic substances such as iodine or dichroic dye；The dehydration treatment of PVA Or the polyenoid such as dehydrochlorinated products of polyvinyl chloride system alignment films etc..From the excellent aspect of optical characteristics, it is preferable to use with Iodine PVA mesentery is dyed and be uniaxially stretched and the polarizer that obtains.
The above-mentioned dyeing using iodine is for example carried out and PVA mesentery is immersed in iodine aqueous solution.It is above-mentioned to be uniaxially stretched Stretching ratio be preferably 3~7 times.Stretch can dyeing processing after carry out, can also an Edge Coloring carry out on one side.In addition, can also It is dyed after the stretch.Swelling treatment, crosslinking Treatment, carrying out washing treatment, drying process etc. are implemented to PVA mesentery as needed. For example, by before dyeing by PVA mesentery dipping wash in water, not only it is washable fall PVA mesentery surface dirt or Antiblocking agent, and PVA mesentery can be made to be swollen and prevent from dyeing unequal.
As the specific example of the polarizer for using laminated body and obtaining, it can enumerate using resin base material and be laminated in this The laminated body or resin base material of PVA resin (PVA resin film) on resin base material and coating are formed in the resin base material On PVA resin laminated body and the polarizer that obtains.It is formed on the resin base material using resin base material and coating The laminated body of PVA resin and the polarizer obtained can for example make by the following method: PVA system resin solution is coated on On resin base material, it is dried and forms PVA resin on resin base material, to obtain resin base material and PVA system resin The laminated body of layer；The laminated body is stretched and dyed and the polarizer is made in PVA resin.In the present embodiment, It include that laminated body is immersed in boric acid aqueous solution to stretch for stretching is representative.In turn, stretching can be as needed into one Step includes being stretched laminated body in the air under high temperature (such as 95 DEG C or more) before stretching in boric acid aqueous solution.It is obtained Resin base material/polarizer laminated body (that is, protective layer that resin base material can be set as to the polarizer) can be used directly, can also will Resin base material is removed from resin base material/polarizer laminated body, and any suitable guarantor corresponding with purpose is laminated in the release surface Sheath and use.The detailed content of the manufacturing method of such polarizer is for example documented in Japanese Unexamined Patent Publication 2012-73580 bulletin In.Whole records of the bulletin are quoted in this manual as reference.
The thickness of the polarizer is, for example, 1 μm~80 μm.In one embodiment, the thickness of the polarizer is preferably 2 μm~30 μ M, further preferably 3 μm~25 μm.
E. image display device
Polarizing film documented by D above-mentioned can be applied to image display device.Therefore, the present invention also includes as use The image display device of polarizing film.As the typical example of image display device, liquid crystal display device, organic electroluminescence hair can be enumerated Light (EL) display device.Composition well known to industry can be used in image display device, therefore omits detailed description.
Embodiment
Hereinafter, the present invention is specifically described by embodiment, but the present invention is not limited to these embodiments.Each spy The measuring method of property is as described below.It should be noted that as long as without being especially expressly recited, " part " and " % " in embodiment is Weight basis.
(1) ratio of the ingredient to the acrylic resin of surface-treated layer is dissolved out
By using three-dimensional optical index/film thickness measuring device prism coupler (Metricon company manufacture, Metricon2010/M method), the ratio of the ingredient of the acrylic resin of measurement dissolution to surface-treated layer.Use prism The measurement of the refractive index of coupler is implemented under the following conditions.
Determination condition
Light source: 594nm
Mode: TE (Transverse electric, transverse electric field)
It scans (Scan): 300~-300
The refractive index R1 of (1-1) base material film
Measurement type (Measurement type): block/substrate (Bulk/Substrate)
By the measurement of base material film come detection pattern (referred to as Knee).The refractive index obtained by measurement is set as R1.
The refractive index R2 of (1-2) surface-treated layer
Measurement type: monofilm (Single Film) (prism-coupled (Prism couple))
Using PET base material, (Toray company is manufactured, trade name: U48-3, refractive index: 1.60) being used as base material film, will be coated with The heating temperature of layer is set as 60 DEG C, in addition to this, in a manner of same as each embodiment, obtains and each embodiment same thickness Laminated body.By measuring the laminated body with Single Film mode, and detect various modes.It will be obtained by measurement Refractive index be set as R2.
The refractive index R3 at position that the depth of (1-3) from base material film side along the direction of surface-treated layer is 3.0 μm
Measurement type:Single Film (Prism couple)
Analytic method: refractive index gradient (Index Gradient)
It is in optical laminate refractive index in the case where the depth direction variation, by above-mentioned using prism coupler Method can quantitatively find out the variations in refractive index relative to depth direction.
By the measurement of optical laminate, detect various modes, parsed by Index Gradient, calculate relative to The variations in refractive index of depth direction.It is determined from base material film side based on following formula along the direction of surface-treated layer " 3.0 μm of depths Refractive index obtained is set as R3 by the position of degree ".
(PET base material hard conating is thick for " position of 3.0 μm of depth " (position away from surface treatment side)=surface-treated layer thickness Degree)-(3 μm)
(1-4) constitutes molten from the ingredient for the position that the depth base material film side along the direction of surface-treated layer is 3.0 μm Out to the ratio X of the ingredient of the acrylic resin of surface-treated layer
By following formula, calculating the depth constituted from base material film side along the direction of surface-treated layer is 3.0 μm The ratio X (%) of the ingredient to the acrylic resin of surface-treated layer is dissolved out in the ingredient of position.
X (%)=(R3-R2) × 100/ (R1-R2)
(2) ocular estimate
About the optical laminate obtained in Examples and Comparative Examples, confirm bad order (from formation by visual observation The presence or absence of in the bad order of the damage of base material film), determined by index below.
Zero: visually arriving injury mark
×: do not arrive injury mark visually
(3) adaptation is evaluated
According to JIS K-5400 checker-wise disbonded test (gridiron pattern subnumber: 100) to surface-treated layer relative to The adaptation of base material film is evaluated, and is determined by index below.
〇: checker-wise stripping number is 0
×: checker-wise stripping number is 1 or more
1 > of < embodiment
1. the production of base material film
Using monomethyl amine by MS resin (MS-200；Methyl methacrylate/styrene (molar ratio)=80/20 is total to Polymers, Nippon Steel Chemical Co., Ltd's manufacture) carry out imidizate (acid imide rate: 5%).Imidizate MS tree obtained Rouge has glutarimide unit (R represented by general formula (1)1And R3For methyl, R2For hydrogen atom), represented by general formula (2) (methyl) acrylic ester unit (R4And R5For methyl) and styrene units.It should be noted that being used in above-mentioned imidizate Bore is the equidirectional rotary double screw extruder of engagement type of 15mm.The set temperature in each temperature adjustment area of extruder is set as 230 DEG C, screw speed is set as 150rpm, with 2.0kg/ hours supply MS resins, the supply amount of monomethyl amine was relative to MS 100 parts by weight of resin are set as 2 parts by weight.MS resin is put into from hopper, after making resin melting by kneading block and be full of, from spray Mouth injects monomethyl amine.Being packed into sealing ring in the end of reaction zone is full of resin.By the pressure of exhaust outlet be- 0.08MPa and by after reaction by-product and excessive methyl amine remove volatile matter.Gone out in the form of strands from setting in extruder After the resin of the mold discharge of mouth cools down in the sink, granulated by pelletizer.Imidizate MS resin obtained Acid imide rate be 5.0%, acid value 0.5mmol/g.
Above-mentioned 100 parts by weight of imidizate MS resin obtained and 5 parts by weight of core-shell-type particle are put into single screw rod Melting mixing is carried out in extruder, and film is carried out by T mould and is formed, thus to obtain extruded film.Extruded film obtained is being drawn It stretches at 140 DEG C of temperature along its length and width direction difference simultaneously biaxial drawing is to 2 times.Tensile speed is in length direction and width Spending on direction is 10%/second.
Thus 30 μm of thickness of base material film A is made.
2. the production of optical laminate
By harden after thickness become 6 μm in a manner of, above-mentioned base material film A unilateral coating UV hardening resin (by 4- HBA (4-hydroxybutyl acrylate, acrylic acid 4- hydroxybutyl) (Osaka Organic Chemical Industry Co., Ltd.'s manufacture) 16 Parts by weight, NK OLIGO UA-53H-80BK (manufacture of chemical industry Co., Ltd., the village Xin Zhong) 32 parts by weight, Viscoat#300 (Osaka Organic Chemical Industry Co., Ltd.'s manufacture) 48 parts by weight, A-GLY-9E (manufacture of chemical industry Co., Ltd., the village Xin Zhong) 4 Parts by weight and IRGACURE 907 (BASF manufacture) 2.4 parts by weight are mixed, and pass through MIBK (Methyl isobutyl respectively Ketone, methyl iso-butyl ketone (MIBK)): PGM (Propylene Glycol monomethylether, propylene glycol monomethyl ether)=50: Resin obtained from 50 solvent dilutes in such a way that solid component concentration becomes 42.0%) and form coating layer.It then, will be upper It states coating layer to be dried at 70 DEG C, and carries out UV hardening, be formed with hard conating thus to obtain in the unilateral side of base material film A Optical laminate 1.By above-mentioned optical laminate 1 for each evaluation.It shows the result in table 1.
2 > of < embodiment
1. the production of base material film
The use level of core-shell-type particle is set as 10 parts by weight, and the draft temperature of extruded film is set as 150 DEG C, In addition to this, base material film B is made in a manner of similarly to Example 1.
2. the production of optical laminate
Other than having used above-mentioned base material film B, the unilateral shape in base material film B is obtained in a manner of similarly to Example 1 At the optical laminate 2 for having hard conating.By above-mentioned optical laminate 2 for each evaluation.It shows the result in table 1.
3 > of < embodiment
1. the production of base material film
The use level of core-shell-type particle is set as 10 parts by weight, and the draft temperature of extruded film is set as 160 DEG C, In addition to this, base material film C is made in a manner of similarly to Example 1.
2. the production of optical laminate
Other than having used above-mentioned base material film C, the unilateral shape in base material film C is obtained in a manner of similarly to Example 1 At the optical laminate 3 for having hard conating.By above-mentioned optical laminate 3 for each evaluation.It shows the result in table 1.
4 > of < embodiment
1. the production of base material film
The use level of core-shell-type particle is set as 13 parts by weight, and the draft temperature of extruded film is set as 152 DEG C, In addition to this, base material film D is made in a manner of similarly to Example 1.
2. the production of optical laminate
Other than having used above-mentioned base material film D, the unilateral shape in base material film D is obtained in a manner of similarly to Example 1 At the optical laminate 4 for having hard conating.By above-mentioned optical laminate 4 for each evaluation.It shows the result in table 1.
5 > of < embodiment
1. the production of base material film
Above-mentioned 100 parts by weight of imidizate MS resin obtained and 15 parts by weight of core-shell-type particle are put into single screw rod Melting mixing is carried out in extruder, and film is carried out by T mould and is formed, thus to obtain extruded film.Extruded film obtained is being drawn It stretches at 152 DEG C of temperature along its length and width direction difference simultaneously biaxial drawing is to 2 times.Tensile speed is in length direction and width Spending on direction is 10%/second.
Thus the base material film E with a thickness of 40 μm is made.
2. the production of optical laminate
Other than having used above-mentioned base material film E, the unilateral shape in base material film E is obtained in a manner of similarly to Example 1 At the optical laminate 5 for having hard conating.By above-mentioned optical laminate 5 for each evaluation.It shows the result in table 1.
6 > of < embodiment
1. the production of base material film
The use level of core-shell-type particle is set as 23 parts by weight, and the draft temperature of extruded film is set as 137 DEG C, In addition to this, base material film F is made in a manner of similarly to Example 1.
2. the production of optical laminate
Other than having used above-mentioned base material film F, the unilateral shape in base material film F is obtained in a manner of similarly to Example 1 At the optical laminate 6 for having hard conating.By above-mentioned optical laminate 6 for each evaluation.It shows the result in table 1.
7 > of < embodiment
1. the production of base material film
Above-mentioned 100 parts by weight of imidizate MS resin obtained and 23 parts by weight of core-shell-type particle are put into single screw rod Melting mixing is carried out in extruder, and film is carried out by T mould and is formed, thus to obtain extruded film.Extruded film obtained is being drawn It stretches at 152 DEG C of temperature along its length and width direction difference simultaneously biaxial drawing is to 2 times.Tensile speed is in length direction and width Spending on direction is 10%/second.
Thus the base material film G with a thickness of 20 μm is made.
2. the production of optical laminate
Other than having used above-mentioned base material film G, the unilateral shape in base material film G is obtained in a manner of similarly to Example 1 At the optical laminate 7 for having hard conating.By above-mentioned optical laminate 7 for each evaluation.It shows the result in table 1.
8 > of < embodiment
1. the production of base material film
The use level of core-shell-type particle is set as 10 parts by weight, and the draft temperature of extruded film is set as 160 DEG C, In addition to this, base material film H is made in a manner of similarly to Example 1.
2. the production of optical laminate
Using above-mentioned base material film H, the film thickness after drying is set as 15 μm, in addition to this, with side similarly to Example 1 Formula, which is obtained, is formed with the optical laminate 8 of hard conating in the unilateral side of base material film H.By above-mentioned optical laminate 8 for each evaluation.It will As a result it is shown in Table 1.
1 > of < comparative example
1. the production of base material film
Above-mentioned imidizate MS resin obtained is put into single screw extrusion machine and carries out melting mixing, passes through T mould And carry out film and formed, thus to obtain extruded film.At 130 DEG C of draft temperature along its length and width by extruded film obtained Simultaneously biaxial drawing is distinguished to 2 times in direction.Tensile speed is 10%/second on length direction and width direction.
Thus the base material film I with a thickness of 40 μm is made.
2. the production of optical laminate
Other than having used above-mentioned base material film I, the unilateral shape in base material film I is obtained in a manner of similarly to Example 1 At the optical laminate 9 for having hard conating.By above-mentioned optical laminate 9 for each evaluation.It shows the result in table 1.
2 > of < comparative example
1. the production of base material film
Other than mismatching core-shell-type particle, base material film J is made in a manner of similarly to Example 1.
2. the production of optical laminate
Other than having used above-mentioned base material film J, the unilateral shape in base material film J is obtained in a manner of similarly to Example 1 At the optical laminate 10 for having hard conating.By above-mentioned optical laminate 10 for each evaluation.It shows the result in table 1.
3 > of < comparative example
1. the production of base material film
Mismatch core-shell-type particle, and the draft temperature of extruded film be set as 160 DEG C, in addition to this, with implementation The same mode of example 1 makes base material film K.
2. the production of optical laminate
Other than having used above-mentioned base material film K, the unilateral shape in base material film K is obtained in a manner of similarly to Example 1 At the optical laminate 11 for having hard conating.By above-mentioned optical laminate 11 for each evaluation.It shows the result in table 1.
[table 1]
As the use of the depth constituted from base material film side along the direction of surface-treated layer being 3.0 μm as shown in Table 1 Position ingredient in dissolution to surface-treated layer above-mentioned acrylic resin ingredient ratio be 18% or more substrate The appearance and excellent adhesion of the optical laminate of the Examples 1 to 8 of film.
Industrial availability
Optical laminate of the invention can suitably be used as the protective layer of the polarizer.Make with optical laminate of the invention It may be suitably used to image display device for the polarizing film of protective layer.Image display device as described above can be used for: portable letter Cease terminal (PDA, Portable information terminal), smartphone, mobile phone, clock, digital camera, The portable equipments such as portable game；The OA equipment such as computer display, laptop, duplicator；It is Video Camera, TV, micro- The Household Electricals equipment such as wave furnace；The vehicle-mounted equipment such as rear portion monitor, auto-navigation system monitor, automobile audio；Number The presentation devices such as word label, commercial store information monitor；The guards equipment such as monitoring monitor；Nursing monitor, The various uses such as the nursing such as medical monitor, Medical Devices.
Symbol description
10 base material films
20 surface-treated layers
100 optical laminates

Claims (10)

1. a kind of optical laminate, it includes the tables of the base material film containing acrylic resin and the unilateral side for being formed in the base material film Surface treatment layer, wherein
It constitutes and is dissolved out from the ingredient for the position that the depth the base material film side along the direction of the surface-treated layer is 3.0 μm Ratio to the ingredient of the acrylic resin of the surface-treated layer is 18% or more.
2. optical laminate according to claim 1, wherein the refractive index of the base material film is being set as R1, it will be described The refractive index of surface-treated layer is set as R2, is 3.0 μ by the depth from the base material film side along the direction of the surface-treated layer When refractive index at the position of m is set as R3, meet:
R3≤0.18R1+0.82R2, wherein be set as R1 < R2.
3. optical laminate according to claim 1 or 2, wherein the surface-treated layer with a thickness of 3 μm~20 μm.
4. optical laminate according to any one of claim 1 to 3, wherein the base material film contains the acrylic acid The core-shell-type particle for being resin and being scattered in the acrylic resin.
5. optical laminate according to claim 4, wherein the base material film is relative to the acrylic resin 100 Parts by weight contain 3 parts by weight~50 parts by weight core-shell-type particle.
6. optical laminate according to any one of claim 1 to 5, wherein the acrylic resin, which has, to be selected from The group being made of glutarimide unit, lactone ring element, maleic anhydride units, maleimide amine unit and glutaric anhydride unit At least one of.
7. optical laminate according to any one of claim 1 to 6, wherein the surface-treated layer is to be coated on institute State the hardening of resin layer on base material film.
8. optical laminate according to any one of claim 1 to 7, wherein the surface-treated layer is selected from by hard At least one of the group that coating, antiglare layer and anti-reflecting layer are constituted.
9. a kind of polarizing film, it includes the polarizer and it is configured at the unilateral protective layer of the polarizer, wherein the protective layer is Optical laminate described in any item of the claim 1 to 8.
10. a kind of image display device has polarizing film as claimed in claim 9.
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