CN1618602A - Method for stripping adhesive optical film - Google Patents
Method for stripping adhesive optical film Download PDFInfo
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- CN1618602A CN1618602A CNA2004100901095A CN200410090109A CN1618602A CN 1618602 A CN1618602 A CN 1618602A CN A2004100901095 A CNA2004100901095 A CN A2004100901095A CN 200410090109 A CN200410090109 A CN 200410090109A CN 1618602 A CN1618602 A CN 1618602A
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- 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
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- 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
- G02F1/1313—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 specially adapted for a particular application
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- 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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- Nonlinear Science (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Mathematical Physics (AREA)
- Liquid Crystal (AREA)
- Polarising Elements (AREA)
Abstract
Provided is a method for peeling an adhesive type optical film from a substrate on which the adhesive type optical film is adhered readily and without damaging the substrate. In a method for peeling an adhesive type optical film from a substrate with an optical film on the substrate surface of which the adhesive type optical film is adhered, this is a peeling method for adhesive type optical film to peel in a condition where liquid exists in a peeling interface between the adhesive agent layer of the adhesive type optical film and the substrate.
Description
Technical field
The present invention relates to a kind of stripping means of adhesive optical film of the strippable substrate adhesive optical film from the band optical thin film that is stained with adhesive optical film at substrate surfaces such as glass substrates.As above-mentioned optical thin film, can list polarizer, polarizer, optical compensating film, brightness improving film and the stacked material that these form etc.
Background technology
In the LCD etc., because its image forming mode be absolutely necessary at the both sides of liquid crystal cells configuration polarization element, and common stickup is polarizer.In addition, in order to improve the display quality of display, except polarizer, can also use various optical elements on the liquid crystal panel.For example, can use the visual angle expansion film and being used to that is used to prevent painted polarizer, is used to improve the visual angle of LCD to improve the brightness improving film etc. of the contrast of display.These films are generically and collectively referred to as optical thin film.
When on liquid crystal cells, pasting above-mentioned optical thin film, can use adhesive usually.In addition, at optical thin film and liquid crystal cells, also have in the joint between the optical thin film, use each material of adhesive driving fit usually in order to reduce light loss.In this case, do not need when making the optical thin film set through advantage such as drying process owing to have, therefore normally used is that adhesive is set at the adhesive optical film on the side of optical thin film in advance as adhesive phase.
All the time, in the time of on the surface that adhesive optical film is fitted in liquid crystal cells, because of the dislocation of applying position occurring, perhaps the liquid crystal display meeting goes wrong when bringing foreign matter into, so peel the adhesive optical film of having fitted off, and once more new adhesive optical film sticked on the surface of liquid crystal cells.But, along with the maximization of LCD and the slimming of liquid crystal cells, peeling off of adhesive optical film also becomes difficult gradually, particularly when the bonding force of adhesive phase is strong, need bigger strength in peeling off, thereby can cause the cell gap of operability variation, liquid crystal cells to change, cause the decline of display quality and liquid crystal cells impaired etc.
As solution to the problems described above, following method has been proposed: between liquid crystal panel and optical thin film, insert heating wire or the slicer (slicer) heated, make the softening or fusion of adhesive simultaneously and the method (patent documentation 1,2) peeled off; After the formation otch is cut apart on the optical thin film on the liquid crystal panel, peel off the method (patent documentation 3) of this cutting plate.In addition, after the display material that has also proposed to be pasted hyaline membrane by adhesive being situated between is immersed in the alkaline solution, peel off the method (patent documentation 4) of hyaline membrane and adhesive from this display material.
But problem is, needs to carry out in said method peel jig is inserted between liquid crystal panel and the optical thin film, perhaps only cuts off the difficult operations such as optical thin film on the liquid crystal panel.In addition, it is residual to produce a large amount of pastes on the liquid crystal panel, perhaps can damage liquid crystal panel etc. by alkaline solution.
Patent documentation 1: the spy opens flat 11-95210 communique;
Patent documentation 2: the spy opens the 2002-350837 communique;
Patent documentation 3: the spy opens the 2001-242448 communique;
Patent documentation 4: the spy opens the 2001-328849 communique.
Summary of the invention
The object of the present invention is to provide a kind of can be with comparalive ease under the situation of wounded substrate not from the method for the strippable substrate adhesive optical film that is stained with adhesive optical film.
The inventor etc. have carried out unbearable research for solving above-mentioned problem, found that and can achieve the above object with following stripping means, thereby finished the present invention.
Promptly, the present invention relates to a kind of stripping means of adhesive optical film, be the stripping means of adhesive optical film of strippable substrate adhesive optical film that is stained with the band optical thin film of adhesive optical film from substrate surface, it is characterized in that peeling off under the state that has liquid on the interface between the adhesive phase of adhesive optical film and substrate peel off.
When as described above from the substrate of band optical thin film during release adhesive type optical thin film, by making liquid be present in peeling off on the interface between the adhesive phase of adhesive optical film and substrate, can under the situation of wounded substrate not with good functionality again release adhesive type optical thin film from the substrate.Therefore, if adopt stripping means of the present invention, even under the situation that size is big or liquid crystal cells is thin of liquid crystal panel, functionality is also good again.The reason that can embody this effect is still indeterminate, but can be presumed as follows: be contacted with adhesive phase by making liquid, make adhesive phase generation swelling or softening, liquid immersion is being peeled off on the interface, reduce bond area, thereby fully reduced bonding force.
In the present invention, from viewpoints such as optical isotropy and hear resistances, preferably utilize acrylic adhesives to form above-mentioned adhesive phase.
In addition, in the present invention, aforesaid liquid is preferably water and/or organic solvent.By using these liquid can obtain the good especially effect of peeling off.
Description of drawings
Fig. 1 is the sectional view of an example of adhesive optical film.
Fig. 2 is the sectional view of an example of liquid crystal panel.
Among the figure: 1-adhesive optical film, 2-optical thin film, 3-adhesive phase, 4-liquid crystal panel, 5-transparency carrier, 6-liquid crystal, 7-partition.
The specific embodiment
As shown in Figure 1, adhesive optical film 1 has the structure that adhesive phase 3 forms is set on optical thin film 2.Usually the surface of the protection of the stage internal mold release film (not shown) before adhering to substrate adhesive phase 3 in the time of on sticking to substrate, is peeled off mould release film and afterwards adhesive phase 3 is fitted on the substrate.In addition, as shown in Figure 2, in the liquid crystal panel 4, be situated between by partition 7 with 2 transparency carriers 5 such as glass substrate be fixed into relatively to, and after liquid crystal 6 is injected in its gap, seal.Then, on two surfaces of transparency carrier 5, be stained with adhesive optical film 1.
Adhesive to the adhesive phase 3 that forms adhesive optical film 1 is not done special restriction, can use various adhesives such as rubber adhesive, acrylic adhesives, silicone adhesive, but preferred water white transparency and and the good acrylic adhesives of cementability of liquid crystal cells (glass substrate) etc.
Acrylic adhesives be main framing for the acrylic polymer of the monomeric unit of (methyl) alkyl acrylate as matrix polymer.Also have, (methyl) acrylate is meant acrylate and/or methacrylate, with the identical meaning of (methyl) expression.The average carbon number of the alkyl in (methyl) alkyl acrylate of the main framing of formation acrylic polymer is 1-12, object lesson as (methyl) alkyl acrylate, can be exemplified as (methyl) methyl acrylate, (methyl) ethyl acrylate, (methyl) butyl acrylate, (methyl) 2-EHA etc., these can be used alone or in combination.In these compounds, the carbon number of preferred alkyl is (methyl) alkyl acrylate of 1-7.
Mean molecule quantity to acrylic polymer is not particularly limited, but weight average molecular weight (GPC) is preferably about about 300,000-2,500,000.The manufacturing of aforesaid propylene acids polymer can be finished with various known method, for example, can suitably select radical polymerizations such as mass polymerization, solution polymerization process, suspension polymerization.As radical polymerization initiator, can use various known materials such as azo class, peroxide, reaction temperature is generally about about 50-85 ℃, and the reaction time is about 1-8 hour.In addition, in above-mentioned manufacture method, the preferred solution polymerization as the solvent of acrylic polymer, is used ethyl acetate, toluene isopolarity solvent usually.Solution concentration is generally about 20-80 weight %.
Matrix polymer as rubber adhesive, can be exemplified as, for example natural rubber, isoprenoid rubber, styrene-butadiene class rubber, reclaimed rubber, polyisobutene class rubber and styrene-isoprene-phenylethene class rubber and s-B-S class rubber etc.
As the matrix polymer of silicone adhesive, can be exemplified as, for example dimethyl polysiloxane, diphenyl polysiloxanes and methyl phenyl silicone etc.
Also can cooperate blowing agent in 3 in the adhesive phase.Blowing agent can utilize the expansion of the blowing agent that causes by heat treated or the bonding force that foaming reduces adhesive phase 3.Blowing agent is not done special restriction, can use the blowing agent of various mineral-type or organic class.
In addition, above-mentioned adhesive is preferably the adhesive composition that contains crosslinking agent.As the multi-functional compounds that can in adhesive, be used, can be exemplified as organic class crosslinking agent and multi-functional metallo-chelate.As organic class crosslinking agent, can be exemplified as epoxies crosslinking agent, isocyanates crosslinking agent, imines class crosslinking agent etc.As organic class crosslinking agent, preferred isocyanate class crosslinking agent.The multi-functional metallo-chelate compound that to be polyvalent metal combine by covalent bond or coordinate bond with organic compound.As polyvalent metal atom, can be exemplified as Al, Cr, Zr, Co, Cu, Fe, Ni, V, Zn, In, Ca, Mg, Mn, Y, Ce, Sr, Ba, Mo, La, Sn, Ti etc.As the atom in the organic compound that is formed with covalent bond or coordinate bond, can be exemplified as oxygen atom etc., as organic compound, can be exemplified as Arrcostab, alcoholic compound, carboxylic acid compound, ether compound, ketonic compound etc.
Mixed proportion to matrix polymers such as acrylic polymer and crosslinking agent has no particular limits, but usually with respect to 100 weight portion matrix polymers (solid constituent), crosslinking agent (solid constituent) is preferably about 0.01-6 weight portion, more preferably about 0.1-3 weight portion.
In addition, in above-mentioned adhesive, various additives such as the filler that can suitably use tackifier, plasticizer, glass fibre, bead, metal dust as required, form by other inorganic powder etc., pigment, colouring agent, filler, antioxidant, ultra-violet absorber, silane coupling agent.Also can contain particulate such as spherical, granular in addition and form the diffusible adhesive phase of display light etc.
Can get involved other adhesive phases or adhesion promoting layer between optical thin film 2 and adhesive phase 3, purpose is strengthen both bonding etc.
As optical thin film 2, can use the material that in the formation of image display devices such as liquid crystal indicator, uses, its kind is had no particular limits.For example, can be exemplified as polarizer as optical thin film.Normally used as polarizer is to have the structure of transparent protective film in a polariscopic side or bilateral.
Polariscope is not particularly limited, can uses various polariscopes.As polariscope, for example can be exemplified as, on hydrophilic macromolecule films such as polyvinyl alcohol film, the formalized polyvinyl alcohol film of part, the partly-hydrolysed film of ethylene-vinyl acetate copolymer class, the material of simple tension after the dichroic substance such as absorption iodine or dichroic dye; Polyalkenes oriented films such as the desalination acid treatment thing of the processed thing of polyvinyl alcohol or polyvinyl chloride etc.Wherein, the polariscope of preferably forming by dichroic substance such as polyvinyl alcohol film and iodine.These polariscopic thickness are had no particular limits, but be about 5 to 80 μ m usually.
The polyvinyl alcohol film is dyeed after the polariscope of simple tension gained for example can be made by after-drawing to 3～7 times the method for former length that dyes in the aqueous solution that polyvinyl alcohol is immersed in iodine with iodine.As required, but also can impregnated in the aqueous solution of KI etc. of boronic acid containing or zinc sulfate, zinc chloride etc.In addition, as required, also can be before dyeing in water, wash polyvinyl alcohol is thin film dipped.By washing polyvinyl alcohol film, the dirt and anti-blocking agent on can flush away polyvinyl alcohol film surface, also can prevent non-uniform phenomenons such as stain by making the polyvinyl alcohol films swell.Stretching can be carried out after with iodine staining, also can stretch on the Edge Coloring limit, also can carry out iodine staining after stretching in addition.Also can or stretch in the water-bath in the aqueous solution of boric acid or KI etc.
Be arranged on the material of the transparent protective film of an above-mentioned polariscopic side or bilateral, the material that preferably has the good transparency, mechanical strength, heat endurance, moisture shielding, isotropism etc. as formation.For example, can be exemplified as polyester polymers such as PETG or PEN; Cellulosic polymer such as cellulose diacetate or cellulose triacetate; Acrylic polymers such as polymethyl methacrylate; Polystyrene or acrylonitritrile-styrene resin styrenic polymers such as (AS resins); Polycarbonate polymer etc.In addition, can also be exemplified as the example of the polymer that forms above-mentioned transparent protective film, for example, as polyolefin polymers such as polyethylene, polypropylene, polyolefin, ethylene-propylene copolymers with ring-type or ENB structure; The polyvinyl chloride-base polymer; Acylamide polymer such as nylon or aromatic polyamide; The acid imide polymer; The sulfone base polymer; The polyether sulfone polymer; Polyethers-ether ketone polymer; The polyphenylene sulfide base polymer; The vinyl alcohol base polymer; The vinylidene chloride base polymer; The polyvinyl butyral resin base polymer; The arylide base polymer; The polyformaldehyde base polymer; Epoxide polymer; Perhaps above-mentioned mixture of polymers.Transparent protective film can also form the cured layer of thermohardening types such as acrylic compounds, carbamates, propenoic methyl carbamate class, epoxies, silicone, ultraviolet curing resin.
In addition, can be exemplified as, open in the 2001-343529 communique (WO01/37007) polymer film of record the spy, for example comprise (A) side chain have replace and/or not substituted imido thermoplastic resin and (B) have the resin combination of the thermoplastic resin of replacement and/or unsubstituted phenyl and itrile group at side chain.As instantiation, can be exemplified as and contain by the contract film of resin combination of alternate copolymer that imines forms and acrylonitritrile-styrene resin of isobutene and N-methyl maleic anhydride.The film that can use mixing extruded product by resin combination etc. to constitute as film.
The thickness of diaphragm can suitably be determined, but from viewpoints such as operability, thin layer such as intensity and the property handled, generally be about 1-500 μ m.Be preferably 1-300 μ m especially, more preferably 5-200 μ m.
In addition, diaphragm had better not be painted.Therefore; the preferred Rth=[(nx+ny that uses)/and 2-nz] d is (wherein; nx and ny are the principal refractive indexs in the thin film planar, and nz is the refractive index of film thickness direction, and d is a film thickness) phase difference value of the film thickness direction of expression for-90nm～+ diaphragm of 75nm.Phase difference value (Rth) by using this thickness direction for-90nm～+ diaphragm of 75nm, can eliminate painted (optical clouration) of the polarizer that causes by diaphragm substantially.Thickness direction phase difference value (Rth) more preferably-80nm～+ 60nm, preferred especially-70nm～+ 45nm.
As diaphragm, from viewpoints such as polarization property and durability, cellulosic polymers such as preferred cellulose triacetate.Preferred especially cellulose triacetate film.In addition, when diaphragm being set, both can use the diaphragm of forming by the same polymer material, also can use the diaphragm of forming by different polymeric material etc. at its positive and negative in polariscopic both sides.It is bonding that above-mentioned polariscope and diaphragm utilize aqueous binder etc. to carry out usually.As aqueous binder, can be exemplified as isocyanates adhesive, polyvinyl alcohol adhesive, gelatin class adhesive, vinyl latex, aqueous polyurethane, waterborne polyester etc.
Not having on the bonding polariscopic surface of above-mentioned transparent protective film, can also carry out hard conating or antireflection handle, anti-adhere to handle, with diffusion or anti-dazzle be the processing of purpose.
Implement purpose that hard conating handles and be to prevent the surperficial impaired etc. of polarizer, method that for example can be by adding good curing tunicle such as the hardness that is made of suitable ultraviolet curing resin such as acrylic compounds and silicone, sliding properties on the surface of transparent protective film etc. forms.The purpose of implementing the antireflection processing is to prevent ambient light in the lip-deep reflection of polarizer, can wait by formation antireflective film in the past and finish.In addition, implement anti-adhere to the purpose of handling be prevent and adjoining course between adhesion.
In addition; the purpose of implementing non-glare treated is to prevent that ambient light from disturbing polarizer to see through the identification of light in the reflection of polarizer surface; for example; can be by adopting sandblast mode and the asperities mode of embossing processing mode and the suitable modes such as mode that cooperate transparent particulate, give the micro concavo-convex structure and form for the transparent protective film surface.As the particulate that in the formation of above-mentioned surperficial micro concavo-convex structure, contains, for example, the transparent particulates such as organic fine particles that can to use average grain diameter be the inorganic particles of being made up of silica, aluminium oxide, titanium oxide, zirconia, tin oxide, indium oxide, cadmium oxide, antimony oxide etc. that often has electric conductivity of 0.5～50 μ m, be made up of crosslinked or uncrosslinked polymer etc.When forming surperficial micro concavo-convex structure, the use amount of particulate is typically about 2～50 weight portions, preferred 5～25 weight portions with respect to transparent resin 100 weight portions that form surperficial micro concavo-convex structure.Antiglare layer also can doublely be done and be used for the polarizer transmitted light is spread and the diffusion layer (visual angle expanded functionality etc.) at expansion visual angle etc.
Also have, above-mentioned anti-reflection layer, anti-adhesion layer, diffusion layer and antiglare layer etc. can also be provided with as other optical layers with the transparent protective film separate configuration except being arranged on transparent protective film from one's body.
In addition, as optical thin film of the present invention, can be exemplified as, for example the operable film that becomes optical layers in the formation of liquid crystal indicator etc. such as reflecting plate or half transmitting plate, polarizer (comprising 1/2 and 1/4 equiwavelength's plate), viewing angle compensation film, brightness improving film.These can also be in stacked one deck on the above-mentioned polarizer or two-layer above use when reality is used except can be separately using as optical thin film of the present invention.
Particularly preferred polarizer is reflection type polarizer or the semi-transmission type polarizer that further stacked reflecting plate or semi-penetration plate form on polarizer; Further laminated phase-difference plate and the ellipsoidal polarizing plate or the circular polarizing disk that form on polarizer; Further stacked viewing angle compensation film on polarizer and the wide visual angle polarizer that forms; Perhaps further stacked brightness improving film and the polarizer that forms on polarizer.
Reflection type polarizer is provided with the reflecting layer and forms on polarizer, can be used for forming the liquid crystal indicator of the type that reflection shows from the incident light of identification side (demonstration side) incident etc., and can omit built-in light sources such as backlight, thereby have advantages such as being easy to make the liquid crystal indicator slimming.When forming reflection type polarizer, can carry out in the suitable modes such as mode in the reflecting layer that the one side setting of polarizer is made up of metal etc. by protective clear layer etc. by being situated between as required.
As the concrete example of reflection type polarizer, can enumerate as required the reflection type polarizer that the paper tinsel that is made of reflective metal such as aluminium or vapor-deposited film is set on the single face of the transparent protective film after delustring is handled and forms the reflecting layer etc.In addition, can also list by making said protection film contain particulate and form surperficial micro concavo-convex structure, and have the reflection type polarizer etc. in the reflecting layer of micro concavo-convex structure thereon.The reflecting layer of above-mentioned micro concavo-convex structure makes incident light diffusion by diffuse reflection, prevents that thus directionality and outward appearance from glittering, and has the advantage that can suppress the light and shade inequality etc.In addition, contain atomic transparent protective film and also have the advantage that when incident light and reverberation thereof see through it, can further suppress the light and shade inequality etc. by making the light diffusion.The formation in reflecting layer of the micro concavo-convex structure of the surperficial micro concavo-convex structure of reflection transparent protective film, method that for example can be by directly setting up metal on the surface of protective clear layer with suitable modes such as evaporation mode such as vacuum evaporation mode, ion plating mode and splash mode or plating modes etc. is carried out.
Instead reflecting plate directly is attached to the method on the transparent protective film of above-mentioned polarizer, the reflecting layer can also be set on the suitable film that with this transparent membrane is benchmark forms back uses such as reflector plate.Also have; because the reflecting layer is made up of metal usually; so from the decline of the reflectivity that prevents to cause, and then keep the viewpoint of initial reflectance for a long time and the viewpoint avoiding establishing protective layer in addition waits, preferably cover the type of service of its reflecting surface with transparent protective film or polarizer etc. owing to oxidation.
Also have, in above-mentioned, the semi-transmission type polarizer can obtain the reflecting layer of the semi-transmission types such as semi-transparent semi-reflecting lens of light transmission when making with reflective layer reflects light.The semi-transmission type polarizer is located at the rear side of liquid crystal cells usually, can form the liquid crystal indicator of following type etc., promptly, when in brighter environment, using liquid crystal indicator etc., reflection comes from the incident light of identification side (demonstration side) and display image, when in darker environment, using, the type of using the built-in light sources such as backlight at the back side be built in the semi-transmission type polarizer to come display image.Promptly, the semi-transmission type polarizer is very useful in the formation of liquid crystal indicator of following type etc., promptly, under bright environment, can save the energy that uses light sources such as backlight, very useful in also can formation under darker environment with the liquid crystal indicator of the type of built-in light source use.
Ellipsoidal polarizing plate or the circular polarizing disk that further laminated phase-difference plate on the polarizer is constituted describes below.Rectilinearly polarized light being changed into elliptically polarized light or circularly polarized light, perhaps elliptically polarized light or circularly polarized light are changed into rectilinearly polarized light, perhaps change under the situation of polarization direction of rectilinearly polarized light, can use polarizer etc.Particularly, as rectilinearly polarized light being changed into circularly polarized light or circularly polarized light being changed into the polarizer of rectilinearly polarized light, can use so-called 1/4 wavelength plate (being also referred to as λ/4 plates).1/2 wavelength plate (being also referred to as λ/2 plates) is generally used for changing the situation of the polarization direction of rectilinearly polarized light.
Ellipsoidal polarizing plate can be used for following situation effectively, i.e. compensation (preventing) supertwist nematic phase (STN) type liquid crystal indicator painted (blue or yellow) that produce because of the birefringence of liquid crystal layer, thus carry out the described painted white black situation that shows etc. that do not have.In addition, it is painted that the polarizer of control three-dimensional refractive index produces in the time of can also compensating (preventing) from the picture of oblique observation liquid crystal indicator, thereby preferred.About circular polarizing disk, for example can when the tone of the image that image is become the colored reflection-type liquid-crystal display device that shows is adjusted, be effectively utilized, but also be had anti-reflective function.
As polarizer, can enumerate to macromolecular material carry out that unidirectional or biaxial tension is handled and the alignment films of the birefringent film that forms, liquid crystal polymer, with the material of the oriented layer of film support liquid crystal polymer etc.Thickness to polarizer also is not particularly limited, and is generally 20～150 μ m.
As described macromolecular material, for example can enumerate polyvinyl alcohol, polyvinyl butyral resin, poly-ethylene methacrylic ether, the poly-hydroxyethyl acrylate, hydroxyethylcellulose, hydroxypropyl cellulose, methylcellulose, Merlon, polyarylate, polysulfones, PETG, PEN, polyether sulfone, polyphenylene sulfide, polyphenylene oxide, polyene propyl group sulfone, polyvinyl alcohol, polyamide, polyimides, polyolefin, polyvinyl chloride, cellulosic polymer, norbornene resin, or their two metaclass, the various copolymers of three metaclass, graft copolymer, mixture etc.These macromolecular materials can wait by stretching becomes orientation thing (oriented film).
As liquid-crystalline polymer, for example can enumerate on the main chain of polymer or side chain and import the backbone chain type of the conjugacy linearity atomic group (mesogene) of giving liquid crystal aligning or the various polymer of side chain type.Concrete example as the backbone chain type liquid crystal polymer, can enumerate the polymer that has giving the structure that combines above-mentioned linearity atomic group (mesogene) on the spacer portion of bendability, for example to the polyesters liquid-crystalline polymer of row orientation, discoid polymer or cholesteric polymers etc.Concrete example as the side chain type liquid crystal polymer, can enumerate following compound etc., promptly, with polysiloxanes, polyacrylate, polymethacrylates or poly-malonate is main chain backbone, has the compound of above-mentioned linearity atomic group (mesogene) portion that is made of the para-oriented ring shape compound unit of giving to the row orientation across the spacer portion that is made of the conjugacy atomic group as side chain.These liquid-crystalline polymers are handled by the following method, promptly, material after carrying out friction treatment, oblique evaporation for the surface that is formed on films such as polyimides on the glass plate or polyvinyl alcohol on the orientation process face of oxide materials etc., heat-treat after sprawling the solution of liquid-crystalline polymer.
Polarizer can be that for example various wavelength plates or the be used to material that compensates the painted or visual angle that the birefringence by liquid crystal layer causes etc. etc. has the material corresponding to the suitable phase difference of application target, also can be stacked more than 2 kinds polarizer and controlled the material of optical characteristics such as phase difference.
Above-mentioned in addition ellipsoidal polarizing plate or reflection-type ellipsoidal polarizing plate are by suitably combination and laminated polarizing sheet or reflection type polarizer and polarizer form.This class ellipsoidal polarizing plate etc. also can form by stacked respectively successively (reflection-type) polarizer and polarizer in the manufacture process of liquid crystal indicator, to constitute the combination of (reflection-type) polarizer and polarizer, and as mentioned above, be pre-formed under the situation for optical thin films such as ellipsoidal polarizing plates, because outstanding, therefore has the advantage of the manufacturing efficient that can improve liquid crystal indicator etc. at aspects such as quality of stability and lamination operation.
Compensation visual angle film is also to make image seem more clearly, be used to enlarge the film at visual angle under the situation of the picture of the direction that tilts a little observation liquid crystal indicator that is not orthogonal to picture.As this kind viewing angle compensation polarizer, for example by the oriented film of polarizer, liquid crystal polymer etc. or transparent base upper support the material etc. of oriented layer such as liquid crystal polymer constitute.What usually use as polarizer is by unidirectional stretching and have birefringent thin polymer film along its face direction, relative therewith, as the polarizer that is used as the viewing angle compensation film, can use along its face direction by biaxial tension and have birefringent thin polymer film, the thickness direction the controlled refractive index that also has been stretched by unidirectional stretching and along its thickness direction along its face direction have biaxially oriented films such as birefringent polymer or picture tilted alignment film etc.As the tilted alignment film, for example can enumerate under the effect of the convergent force that is forming because of heating behind the bonding heat shrink films on the thin polymer film, thin polymer film has been carried out stretch processing or/and the material of shrink process, make material that the liquid crystal polymer tilted alignment forms etc.As the raw material polymer of polarizer can use with above-mentioned polarizer in the polymer phase that illustrates with polymer, can use with the caused painted grade of variation at the identification angle that prevents to form or enlarge the suitable polymer blend as purpose such as the good visual angle of identification based on the phase difference that causes by liquid crystal cells.
In addition, from realizing the viewpoint at the wide visual angle that identification is good, can preferably use the optical compensation polarizer of the optical anisotropic layer that constitutes by the tilted alignment layer of the oriented layer of liquid crystal polymer, particularly discoid liquid crystal polymer with the cellulose triacetate film support.
Polarizer and the film adhered polarizer that together forms of brightness improving are located at usually the back side one side of liquid crystal cells.The brightness improving film is the film that shows below characteristic, promptly, when because of the backlight of liquid crystal indicator etc. or from reflection of rear side etc., when natural daylight incident is arranged, reflect the rectilinearly polarized light of specific polarizing axis or the circularly polarized light of specific direction, and make other light transmissions, therefore brightness improving film and the stacked polarizer that forms of polarizer can be made light incident from light sources such as backlights, and obtain the light that sees through of specific polarization light state, simultaneously, light beyond the described specific polarization light state can not see through, and is reflected.Be reversed in the light that reflects on this brightness improving pellicular front once more by reflecting layer of being located at its rear side etc., make it to incide once more on the brightness improving film, make its part or all light transmission as the specific polarization light state, thereby increase the light that sees through the brightness improving film, simultaneously provide the polarised light that is difficult to absorb to polariscope, can be thereby increase in the light quantity of utilization in the demonstration of liquid crystal display image etc., and can improve brightness thus.Promptly, pass polariscope and make under the situation of light incident from the rear side of liquid crystal cells with backlight etc. not using the brightness improving film, have light with the inconsistent polarization direction of polariscopic polarizing axis and be polarized mirror basically and absorb, thereby can't see through polariscope.That is, though can be different because of employed polariscopic characteristic, about 50% light can be polarized mirror and sponge, and therefore, the light quantity that can utilize in the liquid crystal image demonstration etc. will reduce, and cause the image deepening.Because the brightness improving film carries out following operation repeatedly, promptly, making the light with the polarization direction that can be polarized the mirror absorption is not to incide on the polariscope, but such light is reflected on the brightness improving film, and then finish counter-rotating by reflecting layer of being located at its rear side etc., light is incided on the brightness improving film once more, like this, the brightness improving film only makes in the light of the two reflection and counter-rotating, its polarization direction becomes and can see through by the polarised light of polariscopic polarization direction, provide it to polariscope simultaneously, therefore use the light of backlight etc. in can showing at the image of liquid crystal indicator effectively, thereby can make picture bright.
Also can between brightness improving film and described reflecting layer etc., diffuser plate be set.Towards described reflecting layer etc., set diffuser plate can spread the light that passes through equably by the light of the polarized light state of brightness improving film reflection, eliminates polarized light state simultaneously and becomes the non-polarized light state.That is, diffuser plate makes polarised light return to original natural daylight state.Carry out following operation repeatedly, that is,, be situated between by reflecting layer etc. and after the reflection, once more by diffuser plate and incide on the brightness improving film with this non-polarized light state light directive reflecting layer that is the natural daylight state etc.Make polarised light return to the diffuser plate of original natural daylight state by between brightness improving film and described reflecting layer etc., being provided with, can be in the brightness of keeping display frame, reduce the inequality of the brightness of display frame, thereby even and bright picture can be provided.By this diffuser plate is set, can suitably increase the repeated reflection number of times of first incident light, and utilize the diffusion function of diffuser plate, even and bright display frame can be provided.
As described brightness improving film, for example can use: the demonstration of thin-film multilayer duplexer that dielectric plural layers or refractive index anisotropy are different and so on send as an envoy to the rectilinearly polarized light of specific polarizing axis see through and reflect the characteristic of other light film, cholesteric liquid crystal polymer alignment films or in the film substrate upper support the demonstrating any circularly polarized light reflection that will be in left-handed or the dextrorotation of film and so on of this aligned liquid-crystal layer and film that the film etc. of the characteristic of other light transmissions is suited.
Therefore, make the brightness improving film of the type that the rectilinearly polarized light of above-mentioned specific polarizing axis sees through by utilization, make this see through light and directly incide on the polarizer, can when suppressing the absorption loss water that causes by polarizer, light be seen through effectively along the direction consistent with polarizing axis.On the other hand, utilize the brightness improving film that makes the type that circularly polarized light sees through of cholesteric and so on, though light is incided on the polariscope, but, consider from suppressing the absorption loss water this point, preferably this circularly polarized light carry out rectilinearly polarized lightization, reenter afterwards and be mapped on the polarizer by polarizer.And, by using 1/4 wavelength plate, circularly polarized light can be transformed to rectilinearly polarized light as this polarizer.
In broad wave-length coverages such as visible region, can play the polarizer of 1/4 wavelength plate effect, for example can utilize following mode to obtain, that is, the phase separation layer that will play the phase separation layer of 1/4 wavelength plate effect with respect to the light luminous energy of wavelength 550nm and show other phase difference characteristics for example can play the overlapping mode of the phase separation layer of 1/2 wavelength plate effect etc.So the polarizer that is disposed between polarizer and the brightness improving film can be made of the phase separation layer more than 1 layer or 2 layers.
Also have, with regard to cholesteric, also can make up the material of different reflection wavelengths, constitute overlapping arrangement more than 2 layers or 3 layers, member can be obtained thus, thereby the circularly polarized light that sees through of broad wave-length coverage can be obtained based on this at the wave-length coverage internal reflection circularly polarized light of broads such as visible region.
In addition, polarizer is as above-mentioned polarised light divergence type polarizer, can be made of the member of stacked polarizer and the optical layers more than 2 layers or 3 layers.So, also can be the reflection-type ellipsoidal polarizing plate that forms of combination above-mentioned reflection type polarizer or semi-transmission type polarizer and polarizer or semi-transmission type ellipsoidal polarizing plate etc.
Can utilize at the optical thin film of stacked above-mentioned optical layers on the polarizer that stacked respectively successively mode forms in the manufacture process of liquid crystal indicator etc., but good through being laminated in advance at aspects such as quality of stability or assembly operations to the polarizer of blooming, therefore have the advantage of the manufacturing process that can improve liquid crystal indicator etc.In stacked, can use suitable adhesion means such as bond layer.When bonding described polarizer and other optical layers, their optic axis can adopt the arrangement angles that suits according to target phase difference characteristic etc.
The method that forms adhesive phase 3 on above-mentioned optical thin film 2 is had no particular limits, can be exemplified as, applying adhesive (solution) and dry method, utilize the release sheet that is provided with adhesive phase 3 and the method for transfer printing etc.As the constituent material of release sheet, can be exemplified as film of synthetic resin such as paper, polyethylene, polypropylene, PETG; The thin slice body that sheet rubber, paper, cloth, nonwoven, net, foam piece and metal forming, their duplexer etc. are suitable etc.On the surface of release sheet,, also can carry out lift-off processing such as silicone-treated, chain alkyl processing, fluorine processing in case of necessity in order to improve the fissility from the adhesive phase 3.
Thickness to adhesive phase 3 (dry film thickness) is not particularly limited, but about preferred 10～40 μ m.
In addition, on each layers such as the optical thin film of adhesive optical film or adhesive phase, also can utilize the modes of for example handling such as mode, make it to have ultraviolet absorption ability etc. with ultra-violet absorbers such as bigcatkin willow acid esters compound or benzo phenol compound, benzotriazole compound or cyanoacrylate compound, nickel complex salt compounds.
When on the substrate that aforesaid adhesive optical film is fitted in liquid crystal cells etc., the location dislocation or bring foreign matter into and will influence liquid crystal display etc. if fit, therefore need peel off the adhesive optical film of having fitted, on the surface of liquid crystal cells etc., paste new adhesive optical film once more.But, when the bonding force of adhesive phase is strong, need bigger strength in peeling off, so operability might variation, perhaps the gap of liquid crystal cells can change, cause display quality to descend or liquid crystal cells impaired etc.
The feature of the stripping means of adhesive optical film of the present invention is, peeling off under the state that has liquid on the interface between the adhesive phase of adhesive optical film and substrate peeled off, it is enough low by this stripping means the bonding force of adhesive phase to be dropped to, thus can be under the situation of damaged substrate not release adhesive type optical thin film more easily.In addition, also can suppress paste residual on substrate surface by this stripping means.
As the liquid of the stripping means that is used for adhesive optical film of the present invention, can enumerate water outlet or organic solvent.As organic solvent, can list aliphatic hydrocarbon kind solvents such as hexane, heptane, ester ring type such as cyclohexane, cycloheptane varsol, aromatic hydrocarbon solvent such as toluene, dimethylbenzene, alcohols solvents such as methyl alcohol, ethanol, isopropyl alcohol, ketones solvent such as acetone, MEK, ether solvents such as dimethyl ether, diethyl ether, esters solvents such as methyl acetate, ethyl acetate etc.Organic solvent can be accelerated peeling rate, so be preferred for the situation of release adhesive type optical thin film from the large substrate.
In the scope of not damaging effect of the present invention, can in aforesaid liquid, add inorganic matter or organic additive.Wherein, because of dissolving substrate such as glass, so do not use solution to be the additive of alkalescence.
As making liquid be present in the method on the interface peeled off of the adhesive phase of adhesive optical film and substrate, can be exemplified as, liquid is dripped to the methods of peeling off on the interface such as method, spray or spraying.In addition, also can peel off under the state in impregnated in liquid, or in steam, peel off.
Below, by embodiment the present invention is specifically described, but the present invention is not limited to these embodiment.Wherein, part among each embodiment and % are to be benchmark with weight.
Production Example
(making of adhesive optical film)
The polyvinyl alcohol film of thick 80 μ m is stretched in 40 ℃ iodine aqueous solution after 5 times, make its dry 4 minutes at 50 ℃, thereby obtain polariscope.Use the bonding cellulose triacetate film of polyvinyl alcohol type bonding agent in these polariscopic both sides, thereby obtain polarizer.Apply acrylic adhesives on the one side of this polarizer, drying forms adhesive phase (thickness: 25 μ m), thereby make the adhesion type polarizer.
Embodiment 1
(bonding force experiment)
The adhesion type polarizer of making is cut into the wide size of 25mm.Then, (thickness: 0.4mm) adhesive phase of this adhesion type polarizer of fitting is gone up on the surface for コ one ニ Application グ She System, コ one ニ Application グ 1737, and (50 ℃, 0.5MPa) middle maintenance is 15 minutes at autoclave at the alkali-free glass plate.Then, using cupping machine is under 90 ° the condition as 300mm/min, stretching angle at draw speed, to adhesive phase and alkali-free glass plate peel off interface on spray be about 25 ℃ water, on one side release adhesive type polarizer on one side.(N/25mm) is as shown in table 1 for bonding force when peeling off.
(strip operation experiment)
The adhesion type polarizer of making is cut into 15 inches size.Then, at the adhesive phase with this adhesion type polarizer of fitting on the glass system liquid crystal cells surface of same size, (50 ℃, 0.5MPa) middle maintenance is 15 minutes at autoclave.Then, on one side to the water that spray is about 25 ℃ of peeling off on the interface of adhesive phase and liquid crystal cells, on one side from bight release adhesive type polarizer.Carry out this experiment 10 times, the number of times that the counting liquid crystal cell has bad situations such as crackle or cell gap be unusual to occur.In addition, whether have paste residual, and estimate according to following standard if confirming to peel off liquid crystal cells surface, back.Its result is as shown in table 1.
Zero: no paste is residual.
△: have the part paste residual.
*: there is more paste residual.
Except using toluene (about 25 ℃) to replace the water, with carrying out bonding force experiment and strip operation experiment with embodiment 1 identical method.Its result is as shown in table 1.
Comparative example 1
Not spraying water when peeling off, with and embodiment 1 identical method is carried out the bonding force experiment and strip operation is tested.Its result is as shown in table 1.
Table 1
| Bonding force (N/25mm) | The occurrence number of bad situation (inferior) | Paste is residual | |
| Embodiment 1 | ?4.8 | ?0 | ○ |
| | ?1.9 | ?0 | △ |
| Comparative example 1 | ?11.5 | ?5 | △ |
As shown in Table 1, when release adhesive type optical thin film from liquid crystal cells, by peeling off, can drop to the bonding force of adhesive phase enough low in that liquid being present under the state of peeling off the interface of the adhesive phase of adhesive optical film and liquid crystal cells.For this reason, peel off and can not cause liquid crystal cells and bad situation occurs, and release adhesive type optical thin film easily.In addition, also can improve the efficient of strip operation, so help very much to improve the production efficiency of LCD.
Claims (3)
1, a kind of stripping means of adhesive optical film, it is the stripping means of the adhesive optical film of release adhesive type optical thin film from the substrate of the band optical thin film that is stained with adhesive optical film at substrate surface, it is characterized in that, peel off the adhesive phase and the peeling off under the state that has liquid on the interface of substrate of adhesive optical film.
2, the stripping means of adhesive optical film according to claim 1 is characterized in that, described adhesive phase is formed by acrylic adhesives.
According to the stripping means of claim 1 or 2 described adhesive optical films, it is characterized in that 3, described liquid is water and/or organic solvent.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2003389590A JP2005148638A (en) | 2003-11-19 | 2003-11-19 | Peeling method for adhesive type optical film |
| JP2003389590 | 2003-11-19 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1618602A true CN1618602A (en) | 2005-05-25 |
Family
ID=34696289
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2004100901095A Pending CN1618602A (en) | 2003-11-19 | 2004-11-02 | Method for stripping adhesive optical film |
Country Status (4)
| Country | Link |
|---|---|
| JP (1) | JP2005148638A (en) |
| KR (1) | KR20050048517A (en) |
| CN (1) | CN1618602A (en) |
| TW (1) | TW200530680A (en) |
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- 2003-11-19 JP JP2003389590A patent/JP2005148638A/en active Pending
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- 2004-11-03 TW TW093133467A patent/TW200530680A/en unknown
- 2004-11-18 KR KR1020040094517A patent/KR20050048517A/en not_active Application Discontinuation
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Also Published As
| Publication number | Publication date |
|---|---|
| KR20050048517A (en) | 2005-05-24 |
| TW200530680A (en) | 2005-09-16 |
| JP2005148638A (en) | 2005-06-09 |
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