CN101246233A - Thin polarizer and image display apparatus using the same - Google Patents
Thin polarizer and image display apparatus using the same Download PDFInfo
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- CN101246233A CN101246233A CNA2008100097321A CN200810009732A CN101246233A CN 101246233 A CN101246233 A CN 101246233A CN A2008100097321 A CNA2008100097321 A CN A2008100097321A CN 200810009732 A CN200810009732 A CN 200810009732A CN 101246233 A CN101246233 A CN 101246233A
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- polarizer
- sensitive adhesive
- adhesive layer
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/30—Polarising elements
- G02B5/3025—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state
- G02B5/3033—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state in the form of a thin sheet or foil, e.g. Polaroid
- G02B5/3041—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state in the form of a thin sheet or foil, e.g. Polaroid comprising multiple thin layers, e.g. multilayer stacks
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/30—Polarising elements
- G02B5/3025—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state
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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
- 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
- B32B7/04—Interconnection of layers
- B32B7/12—Interconnection of layers using interposed adhesives or interposed materials with bonding properties
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/32—Holograms used as optical elements
-
- 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
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Polarising Elements (AREA)
- Liquid Crystal (AREA)
- Devices For Indicating Variable Information By Combining Individual Elements (AREA)
Abstract
At least the single side of the polarizer is equipped with the polarized board of the pressure sensitive adhesive layer, which is endowed with excellent durability even in the hot environment, and is pressed with polymer film in the condition with no complex operation. The polarized board upper layer of the pressure sensitive adhesive layer is pressed with polymer film of the phase difference board and the like, thereby obtaining the thin compound polarized board, and is applied in the image display device. At least the single side of the polarizer is equipped with the polarized board (10) of the pressure sensitive adhesive layer (2), wherein the pressure sensitive adhesive layer (2) is composed of the pressure sensitive adhesive layer for displaying the energy storage elastic modulus of 0.15-1Mp in the temperature range of 23-80 DEG C. The pressure sensitive adhesive layer (2) displaying the high energy storage elastic modulus can restrain the size change induced by flex of the polarizer generated in the hot environment. The outside of the pressure sensitive adhesive layer (2) is arranged with compound polarized boards (15, 16) made of polymer film (6) of the phase difference boards and the like, and is combined with the image display unit of the liquid crystal cell (20) and the like.
Description
Technical field
The present invention relates to the Polarizer that in image display devices such as liquid crystal indicator, uses and disposed the image display device of this Polarizer.Polarizer of the present invention, it is good to have slim light-weighted formation and the permanance under hot environment, therefore particularly useful in the various image display devices of the mobile purposes of the slim lightweight of attempting to improve assembly self and permanance.
Background technology
Liquid crystal indicator is applied to desk-top computer and electronic watch etc. all the time, and still, in recent years, its purposes is expansion rapidly.That is, to the large-scale tv machine,, all bring into use liquid crystal indicator regardless of screen size from mobile apparatus such as mobile phones.In addition, except that liquid crystal indicator, organic electroluminescent (organic EL) display device is the tendency that also there is increase at the center with mobile purposes.For the Polarizer that uses in these image display devices, not only to its need increase, but also require to be fit to the performance of each purposes.
Common widely used Polarizer in the aforesaid image display device is to be that the formation of the protective clear layer of representative is made with the tri acetyl cellulose membrane by aqueous tackifier lamination on the two sides of the polarizer (polarisation) that obtains in absorption orientation on the polyvinyl alcohol resin film with the dichromatism pigment.Under the state of pasting under this state or as required various optical layers such as phase retardation film with optical characteristics or optical compensation films, paste on the image-displaying members such as liquid crystal cell or organic EL display element and use by bonding agent or tackifier.
Fig. 4 is this existing Polarizer of expression and the constructed profile of general example of composite polarizing plate of polarizer of having gone up lamination thereof.That is, protective clear layer 4,5 is set on the two sides of polarizer 1, constitutes Polarizer 11.In addition, protective clear layer 5 side are pasted polarizers 6 by formation of pressure-sensitive adhesive layer 3 therein, and are used to paste the formation of pressure-sensitive adhesive layer 7 of image-displaying member etc. in its arranged outside, constitute composite polarizing plate 17.Being used for its surface of temporary protection in the arranged outside of pressure-sensitive adhesive 7 is convention until the partition 9a that pastes image display device etc.
Yet, in the image display device of mobile purposes such as mobile phone, consider recently from design aspect and portable aspect, carrying out the assembly integral thinned is attenuated.Certainly, for use therein Polarizer, also require further slim lightweight.
In addition, owing to mobile relates to various fields of employment, therefore when slim light weight constitutes, also require and existing equal or better permanance.
If in order to tackle aforesaid slimming and lightweight requirements merely with the polarizer or the protective clear layer attenuation of Polarizer; then polarizer has aspect the crackly characteristic of its draw direction and the aspects such as operability when carrying out operation by the mode of tackifier lamination protective clear layer, obtains slim light weight Polarizer and has restriction.In addition; also the trial replacement two sides at polarizer 1 as shown in Figure 4 is provided with the structure of protective clear layer 4,5; omit the protective clear layer 5 that waits a side of other blooming stickup with polarizer 6; directly wait other optical film to be pressed onto on the polarizer 1 polarizer 6 by tackifier or pressure-sensitive adhesive, thereby make the Polarizer thinning.But, in this case, particularly be positioned over hot environment following time, follow the flexible change in size of polarizer 1 to increase, there is the inevitable inadequate problem of permanance.
On the other hand, also proposed with the tri acetyl cellulose membrane of other resin replacement as protective clear layer in the past.For example; the resin solution that coating is formed by the solvent that does not dissolve this film on the single face of the polarizer that is made of hydrophilic polymer or two sides is disclosed in the TOHKEMY 2000-199819 communique (patent documentation 1); and obtain Polarizer with transparent thin film layer, also put down in writing the protective seam that the configuration hyaline membrane constitutes on this transparent thin film layer.The Polarizer that diaphragm that the adhesive layer pressure ring shape olefine kind resin that constitutes by the potpourri by polyvinyl alcohol tackifier and two component adhesive at least one face of polyvinyl alcohol polarizer constitutes forms is disclosed in the TOHKEMY 2000-321430 communique (patent documentation 2).In addition, the Polarizer that the diaphragm that constitutes by waterborne polymeric-isocyanates adhesive layer pressure drop bornylene resinoid at least one face of the polarizer that the polyvinyl alcohol (PVA) based sheet constitutes forms is disclosed in the TOHKEMY 2001-305345 communique (patent documentation 3).
Disclosed hyaline membrane or cyclic olefin resin film in these patent documentations 1～3 (norbornene resin film also roughly synonym) are if be made of the film with polarizer function, then can cut down the member of pasting on the image display device, obtain slim Polarizer.
But, in the lamination of polarizer and transparent polymer film, use under the situation of tackifier, since be applied to this tackifier on the polarizer and make its dry or solidify after, the mode of laminated polymeric thing film, carry out optic axis that lamination makes film have a certain degree with respect to the axle of polarizer very difficult, therefore existing problems aspect the easy formation of the composite polarizing plate of useful especially ellipse or rotatory polarization mode in the image display device of mobile purposes.
In addition, known use bonding agent (pressure-sensitive adhesive) pastes foregoing norbornene resin film on the polarizer.For example, laminated thermoplastic saturated norbornene resin film is disclosed at least one face of polarizer as the Polarizer of protective seam in the Japanese kokai publication hei 6-51117 communique (patent documentation 4).In addition; disclose in the Polarizer of the both sides of polarizer lamination diaphragm in the Japanese kokai publication hei 8-43812 communique (patent documentation 5); at least one of its diaphragm is made of the diaphragm that has the phase retardation film function simultaneously; as the example of diaphragm, enumerated the thermoplastic norbornene resinoid with phase retardation film function.In these patent documentations 4 and 5, as the bonding agent that in the lamination of polarizer and norbornene resin film, uses, natural rubber, synthetic rubber elastic body, vinyl chloride/vinyl acetate co-polymer, polyvinyl alkyl ether, polyacrylate, improved polyalkene resinoid class bonding agent etc. have been enumerated.But; these communiques all be defined in adhesive phase the formation method or with the explanation of the laminating method of protective seam; although also we can say the purpose that has realized forming thin polarizer, aspect the permanance raising, do not put down in writing the characteristic or the effect of its concrete bonding agent.
Therefore, in the Polarizer field of realizing slimming and light-weighted mobile purposes by the reduction of component parts, require a kind of thin polarizer of exploitation, though its when keeping thin and good durability, used that it makes the also very high pressure-sensitive adhesive of degree of freedom in the lamination with the polymer film with optical characteristics or other optical layers.
Summary of the invention
The objective of the invention is to by the Polarizer that formation of pressure-sensitive adhesive layer is set is given the good durability under hot environment on the single face at least of polarizer (polarisation), and the pressure-sensitive adhesive that uses has releasable, thereon during laminated polymeric thing film, in the lamination of polarizer and polymer film, can under the not miscellaneous situation of operation, make thus.Another object of the present invention is to be provided at polymer film such as lamination polarizer on the Polarizer of this band pressure-sensitive adhesive and can realizes the composite polarizing plate of whole thinning.In addition, another object of the present invention is these Polarizers or composite polarizing plate are applied to image display device.
To achieve these goals, the formation of Polarizer of the present invention is: on the single face at least of polarizer formation of pressure-sensitive adhesive layer is set, this formation of pressure-sensitive adhesive layer shows the energy storage elastic modulus of 0.15～1MPa under 23～80 ℃ temperature range.By the hard formation of pressure-sensitive adhesive layer of the higher energy storage elastic modulus of such demonstration is set, can make under the hot environment change in size of Polarizer little.
Above-mentioned formation of pressure-sensitive adhesive layer is set and on another face, is provided with at the single face of polarizer and comprise that the protective seam of transparent resin film is effective.In this Polarizer, polarizer can adsorb the film that is orientated and obtains by the dichromatic pigment of demonstrations such as iodine or dichromatism organic dyestuff and constitute on the polyvinyl alcohol based resins film.In addition, the thickness of formation of pressure-sensitive adhesive layer is preferably 1～40 μ m.In addition, preferred formation of pressure-sensitive adhesive layer has releasable, and exposes the partition (separator) that exists on the face through the processing of silicone release agent at it.
In addition, according to the present invention, also provide a kind of composite polarizing plate, it is at the formation of pressure-sensitive adhesive layer one side configuration polymer film of the Polarizer with above-mentioned formation of pressure-sensitive adhesive layer.Polymer film as used herein, the film of phase differential constitutes in the face by having, and has the function of protective seam and polarizer concurrently, can obtain reducing and slim light-weighted composite polarizing plate by the member number.In addition, can obtain the slim composite polarizing plate of ellipse or rotatory polarization pattern thus.
Above-mentioned Polarizer or composite polarizing plate be the optical layers of other display optical function of lamination further.For example; above-mentioned formation of pressure-sensitive adhesive layer is set on the single face of polarizer, at the Polarizer that protective clear layer is set on another face or in the composite polarizing plate of polymer films such as this formation of pressure-sensitive adhesive layer one side configuration phase difference plate; with the opposing face of the protective clear layer of polarizer driving fit on, can have surface-treated layers such as hard conating, anti-reflection layer, anti-dazzle photosphere.
In addition; above-mentioned formation of pressure-sensitive adhesive layer is set and as required at the Polarizer that protective clear layer is set on another face or in the composite polarizing plate of polymer films such as this formation of pressure-sensitive adhesive layer one side configuration phase difference plate at the single face of polarizer; the opposition side of the face that contacts with the described formation of pressure-sensitive adhesive layer of polarizer (be provided with under the situation of protective clear layer and be its outside); can paste reflecting plate or semi-penetration plate, and form the slim composite polarizing plate of reflection-type or semi-penetration type.
In addition; polarizer single face above-mentioned formation of pressure-sensitive adhesive layer is set and as required at the Polarizer that protective clear layer is set on another face or in the composite polarizing plate of polymer films such as this formation of pressure-sensitive adhesive layer one side configuration phase difference plate; the opposition side of the face that contacts with the described formation of pressure-sensitive adhesive layer of polarizer (be provided with under the situation of protective clear layer and be its outside); also can paste brightness and improve film, improve the utilizable slim composite polarizing plate of system and form brightness.
Image display device of the present invention has and resembles such image-displaying member of liquid crystal cell or organic EL display element and above-mentioned Polarizer or composite polarizing plate.In this image display device, described Polarizer of configuration or composite polarizing plate on the single face at least of image-displaying member.
The invention effect
Polarizer of the present invention is the Polarizer that is configured in the formation of pressure-sensitive adhesive layer of the energy storage elastic modulus that shows regulation in 23～80 ℃ the temperature range on the single face at least of polarizer.And, the outside at this formation of pressure-sensitive adhesive layer, other has polymer film, for example polarizer of optical function by lamination, can reduce the sheet number of the film of on image-displaying member, pasting, obtain the formation of more slim light weight, simultaneously, even formation of pressure-sensitive adhesive layer also can suppress to follow the change in size of polarizer contraction under hot environment, can obtain good thin polarizer of permanance and slim composite polarizing plate.In addition, by itself and image-displaying members such as liquid crystal cell or organic EL display element are made up, can obtain thinning and permanance excellent images display device.
Description of drawings
Fig. 1 is that figure is cutd open in the signal of a layer example that constitutes of expression Polarizer of the present invention.
Fig. 2 is the constructed profile of a layer example that constitutes of expression composite polarizing plate of the present invention.
Fig. 3 is the constructed profile that expression is installed to composite polarizing plate of the present invention the example of liquid crystal panel.
Fig. 4 is that the existing Polarizer of expression reaches the constructed profile of the general example of the composite polarizing plate of lamination polarizer thereon.
Symbol description:
1 polarizer
2 formation of pressure-sensitive adhesive layer (energy storage elastic modulus height)
3 formation of pressure-sensitive adhesive layer (having now)
4,5 protective clear layers
6 polymer films (polarizer)
7 formation of pressure-sensitive adhesive layer
8 other optical layers
9,9a partition
10 Polarizers
11 Polarizers (having now)
15,16 composite polarizing plates
17 composite polarizing plates (having now)
20 liquid crystal cells
Embodiment
Below, suitably present invention will be described in detail with reference to the accompanying.Fig. 1 is the schematic cross-section that shows a layer example that constitutes of Polarizer of the present invention.With reference to Fig. 1, Polarizer 10 of the present invention is Polarizers that formation of pressure-sensitive adhesive layer 2 is set on the single face at least of polarizer 1.And this formation of pressure-sensitive adhesive layer 2 is made of the formation of pressure-sensitive adhesive layer of the energy storage elastic modulus that shows 0.15～1MPa in 23～80 ℃ temperature range.Be meant that at this said " the energy storage elastic modulus that in 23～80 ℃ temperature range, shows 0.15～1MPa " energy storage elastic modulus under any temperature in this temperature range all is the value in the above-mentioned scope.The energy storage elastic modulus rises with temperature usually and reduces gradually, if therefore the energy storage elastic modulus of 23 ℃ and 80 ℃ is all in above-mentioned scope, then can observe under the temperature of this scope, shows the energy storage elastic modulus of above-mentioned scope.
The formation of pressure-sensitive adhesive layer that shows so high energy storage elastic modulus can be set on the two sides of polarizer 1; but generally speaking; single face at polarizer 1 is provided with the formation of pressure-sensitive adhesive layer 2 that shows aforesaid energy storage elastic modulus, is provided with to comprise that the protective seam 4 of transparent resin film is favourable on another face of polarizer 1.Formation of pressure-sensitive adhesive layer 2 expose on the face configuration partition 9, be convention with this surface temporary protection until what paste with other member.
Polarizer 1 is to have the film of selecting the linearly polarized light function from the natural light of incident, for example, can use the dichromatism pigment to adsorb the light polarizing film of orientation on the polyvinyl alcohol based resins film.The polyvinyl alcohol resin that constitutes polarizer 1 can be by obtaining the saponification of polyvinyl acetate esters resin.As the polyvinyl acetate esters resin, except as the independent polymeric polyvinyl acetate (PVA) of vinyl acetate, can also the illustration vinyl acetate and can with the interpolymer of other monomer of its copolymerization.As can with other vinyl acetate copolymerized monomer, for example can enumerate: unsaturated carboxylic acid class, olefines, vinyl ethers, unsaturated sulfonic acid class, have the acrylic amide of ammonium etc.The saponification degree of polyvinyl alcohol resin is generally about 85～about 100 moles of %, preferred 98 moles more than the %.The further modification of this polyvinyl alcohol resin for example, can be used with aldehydes modified polyethylene alcohol formal or polyvinyl acetal etc.In addition, the degree of polymerization of polyvinyl alcohol resin is generally about 1000～about 10000, preferred about 1500～about 5000.
The unstretching film (former anti-Off イ Le system) that the film that described polyvinyl alcohol resin is made can be used as polarizer 1 uses.The film build method of polyvinyl alcohol resin is not particularly limited, and can form film by known method.The thickness that comprises the unstretching film of polyvinyl alcohol resin is not particularly limited, and for example is about 1 μ m～about 150 μ m.If consider the easiness of stretching etc., then preferred its thickness is more than the 10 μ m.
Polarizer 1 is through operation that will such polyvinyl alcohol resin film uniaxial tension, make the dyeing of polyvinyl alcohol resin film operation of its absorption dichromatism pigment, be adsorbed with the operation of washing after the operation of polyvinyl alcohol resin film of dichromatism pigment and the processing of this boric acid aqueous solution with the boric acid aqueous solution processing and make with the dichromatism pigment.As the dichromatism pigment, can use iodine or dichromatic organic dyestuff.
On the single face at least of polarizer 1, form formation of pressure-sensitive adhesive layer 2.So-called pressure-sensitive adhesive, only be meant by compacting adhere to the surface of other material, in addition with it when being peeled off by sticking face, even the also viscoelastic body removed of trace slash hardly of intensity is arranged on the adherend, be also referred to as bonding agent.Formation of pressure-sensitive adhesive layer 2 can be by form the various bonding agents that were used for image display device in the past as the basis.For example, acrylic compounds, rubber-like, polyurethanes, silicone, polyvingl ether etc. are arranged.In addition, also can be energy ray-curable, thermohardening type etc.Wherein, the acrylic resin that preferably clear, weatherability, thermotolerance etc. are good is as the bonding agent of base polymer.
As acrylic adhesives, be not particularly limited, can be fit to use (methyl) esters of acrylic acid base polymer such as (methyl) butyl acrylate, (methyl) ethyl acrylate, (methyl) Isooctyl acrylate monomer, (methyl) acrylic acid-2-ethyl caproite and use the copoly type base polymer more than 2 kinds such as these (methyl) acrylate.In addition, can the copolymerization polar monomer in these base polymers.As polar monomer, for example can enumerate: (methyl) acrylic acid, (methyl) acrylic acid-2-hydroxypropyl acrylate, (methyl) acrylic acid-2-hydroxyl ethyl ester, (methyl) acrylamide, (methyl) acrylic acid-2-N, N-dimethylaminoethyl, (methyl) glycidyl acrylate etc. has the monomer of carboxyl, hydroxyl, amide group, amino, epoxy radicals etc.
These acrylic adhesives certainly use separately, but usually and use crosslinking chemical.As crosslinking chemical, can illustration and carboxyl between form the polyisocyanate compound that forms amido link between the poly epoxy compounds that forms ester bond between the polyamine compounds that forms amido link between the divalent of carboxylic metallic salt or polyvalent metal ion and the carboxyl and the carboxyl or polyol compound and the carboxyl etc.Wherein, polyisocyanate compound is extensive use of as organic class crosslinking chemical.
So-called energy ray-curable bonding agent, be meant irradiation and the character of solidifying with the ultraviolet ray of being subjected to or electron ray homenergic ray, have cohesive at the energy-ray pre-irradiation and be close to adherends such as films, the irradiation that has by energy-ray is cured, can regulates the bonding agent of the character of closing force.As the energy ray-curable bonding agent, especially preferably use ultraviolet-curing adhesive.The energy ray-curable bonding agent is a major component with acrylic adhesives and energy-ray polymerizable compound generally.Usually further cooperate crosslinking chemical, and also can cooperate light trigger, photosensitizing agent etc. as required.
In the adhesive composition that is used to form formation of pressure-sensitive adhesive layer 2, except that above-mentioned base polymer and crosslinking chemical, as required for the bounding force of regulating bonding agent, cohesive force, viscosity, elastic modulus, glass transition temperature etc., for example also can cooperate proper additive such as natural materials or synthetic such as resene, tackifying resin, antioxidant, dyestuff, pigment, defoamer, anticorrosive, Photoepolymerizationinitiater initiater.In addition, also can contain particulate and form the formation of pressure-sensitive adhesive layer of display light scattering.
Among the present invention, constitute at the formation of pressure-sensitive adhesive layer 2 of the setting of single face at least of polarizer 1 formation of pressure-sensitive adhesive layer by the energy storage elastic modulus that in 23～80 ℃ temperature range, shows 0.15～1MPa.The energy storage elastic modulus can use shown in the commercially available determination of viscoelasticity device embodiment for example described later, and the determination of viscoelasticity device " DYNAMICANALYZER RDA 11 " that REOMETRIC society makes is measured.About 0.1MPa, in contrast to this, the energy storage elastic modulus 0.15～1MPa of the formation of pressure-sensitive adhesive layer of stipulating among the present invention 2 is very high value to the energy storage elastic modulus of the pressure-sensitive adhesive that uses in the common image display device or the blooming of its use at the most.By use to show high like this energy storage elastic modulus, be hard pressure-sensitive adhesive, the change in size that the contraction phase of the polarizer that can reduce to produce under the hot environment is followed.That is, can obtain favorable durability.
The means that make the energy storage elastic modulus of formation of pressure-sensitive adhesive layer 2 become high value like this are not particularly limited, and for example, are cooperating oligomer as in the above-mentioned common adhesive composition, and the oligomer that particularly cooperates the urethane acrylate class is effective.Preferably after cooperating such urethane acrylate quasi-oligomer, the irradiation energy line solidifies it, can show high energy storage elastic modulus like this.Cooperating the adhesive composition of urethane acrylate quasi-oligomer or be coated on it on support membrane and carry out ultraviolet curing and the membranaceous pressure-sensitive adhesive that forms, is known.
The method that forms formation of pressure-sensitive adhesive layer 2 on polarizer 1 is not particularly limited, for example, can be provided with by the following method, after using aforesaid adhesive composition to form formation of pressure-sensitive adhesive layer 2 on the single face of polarizer 1 or two sides, lamination comprises the method for the partition that has carried out the resin molding that the demouldings such as silicone handle; Or as above-mentioned partition on form formation of pressure-sensitive adhesive layer 2 after, be transferred to method on the polarizer 1 etc.In addition, when on polarizer 1, forming formation of pressure-sensitive adhesive layer, the processing that can on the face (one or two) of stickup one side of polarizer 1 or formation of pressure-sensitive adhesive layer 2, be used to improve adaptation as required, for example corona treatment etc.
The thickness of formation of pressure-sensitive adhesive layer 2 is preferably 1～40 μ m.In order to obtain target thin polarizer of the present invention, in the scope of not damaging characteristics such as processability and permanance, be preferably formed thin formation of pressure-sensitive adhesive layer 2, for example, form 3～25 μ m, when keeping good workability, be fit to aspect the size that can suppress polarizer.
The formation of pressure-sensitive adhesive layer 2 of above-mentioned explanation preferably is set at the single face of polarizer 1, and comprises the protective seam 4 of transparent resin film in another face setting of polarizer 1.As protective seam 4, can use suitable hyaline membrane.Wherein, the preferred film that uses the resin that comprises that the transparency and uniform optical characteristics, physical strength, thermal stability etc. are good.For example, can enumerate acrylic resin film such as polyester resin films such as cellulosic resin films such as triacetyl cellulose and diacetyl cellulose, polyethylene terephthalate and polyethylene glycol isophthalate, polybutylene terephthalate, poly-(methyl) methyl acrylate and poly-(methyl) ethyl acrylate, polycarbonate resin film, polyether sulfone resin molding, polysulfones resin molding, polyimide based resin film, polyolefin resin film, be the cyclic olefin resin film etc. of monomer with cyclic olefins such as norborene, but be not limited to these.Protective seam 4 is bonding with polarizer 1, can use tackifier or pressure-sensitive adhesive.
The surface of protective seam 4 can be provided with surface-treated layers such as hard conating, anti-reflection layer, anti-dazzle photosphere as required.Hard conating forms for the damage that prevents the Polarizer surface; mainly can for example suitably select adaptation and the good resin of hardness with protective clear layer 4 resin such as acrylic compounds or silicone, and form on the surface of protective clear layer 4 from ultraviolet curing resin.
In addition, anti-reflection layer forms in order to prevent outside reflection of light on the Polarizer surface, can form by known method.Anti-dazzle photosphere is in order to prevent that external light reflection is to the surface of Polarizer and the visibility obstacle that produces forms; generally by the surface roughening mode of for example sandblast mode or embossing processing mode etc. or coating fluid that coating mixed transparent particulate obtains in ultraviolet curing resin and the formation such as mode of solidifying, make to form concavo-convex formation on the surface of protective clear layer 4.
More than the Polarizer of the present invention 10 of Gou Chenging can obtain composite polarizing plate by disposing polymer film in formation of pressure-sensitive adhesive layer 2 one sides.Fig. 2 is the constructed profile of a layer example that constitutes of expression composite polarizing plate of the present invention.Composite polarizing plate 15 shown in Figure 2 is to form at formation of pressure-sensitive adhesive layer 2 one sides configuration polymer film 6 under the state of peeling off partition 9 from Polarizer shown in Figure 1 10.In this embodiment, polymer film 6 is made of polarizer.The surface of polymer film 6 is provided with formation of pressure-sensitive adhesive layer 7, and its surface is by partition 9a temporary protection in addition.
As the polymkeric substance of form dielectric grid film, for example can enumerate: polyolefins such as polycarbonate-based, polyvinyl alcohol, polystyrene type, polymethylmethacrylate class, polypropylene, polyarylate class, polyamide-based, be cyclic polyolefin hydro carbons of monomer etc. with ring-type alkene classes such as norborene.Stretched film can be the film of handling by suitable mode such as single shaft or twin shaft.In addition, also can use with the bonding of heat-shrinkable film under by applying convergent force and/or tensile force the birefringence film of the refractive index of controlling diaphragm thickness direction.
Particularly be formed under the situation of composite polarizing plate of the elliptical polarized light that uses in the image display device of mobile purposes or rotatory polarization pattern, can use λ/2 plates or λ/4 plates effectively.The composite polarizing plate of elliptical polarized light or rotatory polarization pattern has under incident polarized light is the situation of rectilinearly polarized light it is become elliptically polarized light or circularly polarized light, and is under the situation of elliptically polarized light or circularly polarized light it to be become the function of rectilinearly polarized light in incident polarized light.Particularly, can use the polarizer that is called λ/4 plates and shows the phase differential of 1/4 wavelength with respect to the incident light wavelength as elliptically polarized light or circularly polarized light being become rectilinearly polarized light and rectilinearly polarized light can being become the polarizer of elliptically polarized light or circularly polarized light.In addition, λ/2 plates have the function that changes the linear polarization direction of light.In addition, λ/2 plates and λ/4 flaggies are pressed make optic axis, can obtain showing broadband λ/4 plates of the phase differential of 1/4 wavelength in extensive wavelength coverage with the angular cross of regulation.
The composite polarizing plate of above-mentioned elliptical polarized light pattern, the coloring phenomenon that produces for the birefringence that prevents in the liquid crystal indicator owing to liquid crystal is effective.The composite polarizing plate of rotatory polarization pattern improves purpose etc. with brightness in reflection-type or semi-penetration type image display device effectively uses.The composite polarizing plate of rotatory polarization pattern also has anti-reflective function.
In the composite polarizing plate 15 of the present invention, the outside of the polymer film of on the high formation of pressure-sensitive adhesive layer 2 of energy storage elastic modulus, pasting 6, for the image display device lamination or with other optical layers lamination, formation of pressure-sensitive adhesive layer 7 preferably is set.In addition, exposing on the face of this formation of pressure-sensitive adhesive layer 7 preferably has the partition 9a that comprises the resin molding that has carried out the processing of release agents such as silicone.
The formation of pressure-sensitive adhesive layer 7 of the arranged outside of polymer film 6, can be the general formation of pressure-sensitive adhesive layer that conventional images display device or the blooming that is used for it use, needn't have in the present invention the energy storage elastic modulus degree of the formation of pressure-sensitive adhesive layer 2 that the single face at least at polarizer 1 is provided with.As an example, can use with the pressure-sensitive adhesive as base polymer such as acrylic polymers or silicone polymkeric substance, polyester, polyurethane.Wherein, preferred select to use resemble the such optical transparence of acrylic compounds pressure-sensitive adhesive good, keep suitable wetting state and cohesive force, also good and have weatherability and thermotolerance etc., under the condition of heating and humidification, do not produce protuberance or the pressure-sensitive adhesive of the problem of peeling off such as peel off with the cohesive of base material.
Formation of pressure-sensitive adhesive layer 7 can contain as required and is useful on the particulate of giving light scattering, can cooperate the filling agent, pigment or the colorant that comprise glass fibre or glass microsphere (beads), resin microsphere, metal powder or other inorganic powder etc., antioxidant, ultraviolet light absorber etc.Ultraviolet light absorber has salicylate compounds or benzophenone compound, benzotriazole compound, cyanoacrylate compound, nickel complex salt compounds etc.
The formation of formation of pressure-sensitive adhesive layer 7 can be in the following manner for example: adhesive composition is dissolved or dispersed in the organic solvents such as toluene and ethyl acetate and prepares the solution of 10～40 weight %, and this solution is directly coated the mode on the surface of polymer film 6; Carrying out forming formation of pressure-sensitive adhesive layer on the partition that the demouldings such as silicone handle in advance, and this its transfer to mode on the polymer film 6.The thickness of formation of pressure-sensitive adhesive layer 7 is determined according to its bounding force etc., is generally the scope of 1～50 μ m.
Be provided with the polarizer 1 of the high formation of pressure-sensitive adhesive layer of energy storage elastic modulus 2 and the laminating method of polymer film 6 and be not particularly limited, can carry out lamination by existing technique known.As an example, can enumerate and use overlay film roller (Stickers closes ロ one Le) etc., the optic axis of polymer film 6 be intersected vertically or parallel laminating method or make the optic axis of polymer film 6 become the laminating method of predetermined angular with respect to the polarizing axis of polarizer with the polarizing axis of polarizer.Composite polarizing plate of the present invention can use in the polarizing axis that makes polarizer 1 becomes the formation of rotatory polarization that the lamination of predetermined angular forms or elliptical polarized light pattern with the optic axis of polymer film 6 especially effectively.
In addition, Polarizer of the present invention or composite polarizing plate, optical layers that can lamination other display optical function more than 1 layer or 2 layers when it uses.Be not particularly limited about this optical layers, for example can enumerate: reflection horizon, semi-penetration layer, light diffusion layer, polarizer, solar panel, brightness improve film etc.
The composite polarizing plate of reflection-type can be used for making the liquid crystal indicator of the type that shows from the incident light reflection of visual side, can omit light sources such as backlight, therefore makes the liquid crystal indicator slimming easily.In addition, the composite polarizing plate of semi-penetration type can be used in the open the liquid crystal indicator as reflection-type, the type that in the dark shows as the infiltration type that uses light source such as backlight.Be used to form the reflection horizon of the composite polarizing plate of reflection-type, for example can on the protective seam 4 of polarizer 1, set up the paper tinsel that comprises metals such as aluminium or vapor-deposited film and form.In addition, be used to form the semi-penetration layer of the composite polarizing plate of semi-penetration type, can be by described reflection horizon being made the method for half-mirror (half mirror), maybe will containing the reflecting plate and the bonding formation such as method of Polarizer of pearl pigment display light permeability.
On the other hand; the composite polarizing plate of diffused; it is the composite polarizing plate that has the function that makes the incident light diffusion simultaneously; can use the method for for example on the protective seam 4 of polarizer 1, carrying out delustring and handling, method, the gluing the whole bag of tricks such as method that contain the film of particulate that coating contains the resin of particulate, form the light diffusion layer of micro concavo-convex structure from the teeth outwards.
In addition, the composite polarizing plate that reflection diffusion is dual-purpose is the composite polarizing plate that the method in the reflection horizon etc. by its concaveconvex structure of reflection for example is set on the micro concavo-convex structural plane of diffused composite polarizing plate is provided with diffusive reflective layer.The reflection horizon of micro concavo-convex structure makes incident light diffusion by diffuse reflection, has can prevent directive property and dazzle (ギ ラ Star キ), suppress the advantage of light and shade inequality etc.In addition, contain the resin bed or the film of particulate, when incident light and reflected light thereof see through this layer, make its diffusion, therefore also have and further to suppress the unequal advantage of light and shade.The reflection horizon of reflecting surperficial micro concavo-convex structure can form by utilizing methods such as evaporations such as for example vacuum evaporation, ion plating, sputter or coating directly to set up metal on the surface of micro concavo-convex structure.In addition, the particulate that cooperates in order to form surperficial micro concavo-convex structure, can use mean grain size for example is 0.1～30 μ m mineral-type particulate that comprises silicon dioxide, aluminium oxide, titanium dioxide, zirconia, tin oxide, indium oxide, cadmium oxide, antimony oxide etc., the organic based fine particles that comprises crosslinked or uncrosslinked polymkeric substance etc. etc.
As the example of polarizer, can enumerate and the identical polarizer of explanation in polymer film 6 with phase differential.
Solar panel is set up for purpose such as light path control, therefore can form as prism array sheet or lens array sheet or band point sheet material (De Star ト pays Let シ one ト) etc.
Brightness improves film, has the part of the natural light of the incident form with linearly polarized light or circularly polarized light is seen through, and the film of the function that remaining light reflection is utilized again, use for the brightness that improves liquid crystal indicator.Its example can be enumerated: with the anisotropy of refractive index mutually different film multi-disc laminations make the reflection-type linearly polarized light separating sheet that produces anisotropy in the reflectivity and be designed to, the alignment films of cholesteric liquid crystal polymer or this aligned liquid-crystal layer be supported on reflection-type rotatory polarization separating sheet on the film base material etc.
Above-described various optical layers uses bonding agent or tackifier and Polarizer or composite polarizing plate to form one, and bonding agent of Shi Yonging or tackifier are not particularly limited for this reason, can select to use suitable adhesive or tackifier.From the simplicity of gluing operation with prevent that the viewpoint of optical skew generation etc. from considering, preferably use pressure-sensitive adhesive.As the example of pressure-sensitive adhesive, can enumerate the previous same pressure-sensitive adhesive that pressure-sensitive adhesive 7 is described with reference to Fig. 2.In addition, under the situation that the formation of pressure-sensitive adhesive layer of formation exposes from the teeth outwards,, can dispose partition in order to prevent pollution etc.Also can use and previously described same partition as partition.
Polarizer of the present invention or composite polarizing plate can be configured on the various image-displaying members, obtain image display device.For example, be configured to the single or double of liquid crystal cell, can obtain liquid crystal indicator.Employed liquid crystal cell is a liquid crystal cell arbitrarily, for example, can use film transistor type to form liquid crystal indicators as active matrix drive-type liquid crystal cell, the super-twist nematic of representative as the various liquid crystal panels such as the driving liquid crystal cell of passive matrix of representative.When the both sides of liquid crystal cell were provided with Polarizer of the present invention or composite polarizing plate, both can be the same or different.
Fig. 3 is the constructed profile that expression composite polarizing plate of the present invention is installed to the example on the liquid crystal panel.
In this embodiment; at the state of peeling off partition 9a from composite polarizing plate shown in Figure 2 15; paste the single face (upside among the figure) of liquid crystal cell 20 by its formation of pressure-sensitive adhesive layer 7; and the another side (downside of figure) at liquid crystal cell 20 carries out lamination (under this state, being equivalent to composite polarizing plate shown in Figure 2), sticks on the composite polarizing plate 16 that outside layer is pressed with other optical layers 8 in these formation of pressure-sensitive adhesive layer 7 one sides in addition with the order of high formation of pressure-sensitive adhesive layer 2/ polarizer 1/ protective clear layer 4 of formation of pressure-sensitive adhesive layer 7/ polymer film (polarizer) 6/ energy storage elastic modulus.Liquid crystal indicator in this example, the upside of figure are visual side, and the downside that is configured to figure under the situation of backlight is being set.At this moment, other optical layers 8 can be reflection horizon, semi-penetration layer, solar panel, brightness raising film etc.
In addition, the composite polarizing plate of the present invention flat-panel screens such as image display device, for example organic EL display that also can be used for effectively beyond the liquid crystal indicator have the rotatory polarization or the elliptical polarized light pattern of anti-reflective function.The image display device that certain Polarizer of the present invention or composite polarizing plate are suitable for is not limited at this illustrated image display device.
Embodiment
Below, further specify the present invention by embodiment and comparative example, but the present invention is not subjected to the qualification of these examples.In addition, in the following example, energy storage elastic modulus and size changing rate are the values of measuring by following method.
[elastic modulus]
The energy storage elastic modulus of pressure-sensitive adhesive (G ') is as test film with the thick cylinder of 8mm φ * 1mm, the determinator " DYNAMICANALYZER RDA II " that uses REOMETRIC society to make is tried to achieve with the torsional shear method (twisting with the fingers the disconnected method of り せ ん) of frequency 1Hz.
[size changing rate]
Make the polarisation absorption axes become 120 degree with the size cutting of 2.7 inches at diagonal angle (about 6.9cm) Polarizer made in each example with respect to long limit clockwise direction, this formation of pressure-sensitive adhesive layer one side is pasted on the glass plate that thickness is 0.7mm, under the condition of 50 ℃ of temperature, pressure 0.5MPa, carry out 20 minutes autoclaved.Behind the natural cooling, each sample is put into the baking oven that temperature keeps 85 ℃, keep 500 hours heat test.The size of Polarizer before and after the two-dimentional determinator " NEXIV VMR-12072 " that uses the ニ コ of Co., Ltd. Application to make, determination test is by following formula driven dimension rate of change.In addition, the long limit and the minor face of Polarizer carried out dimension measurement respectively, obtain the size changing rate on long limit and the size changing rate of minor face respectively, and with the size changing rate of its mean value as Polarizer integral body.
Size changing rate (%)=[size before (size after the size-test before the test)/test] * 100
In addition, in the following example,, use following tackifier as the pressure-sensitive adhesive that directly is provided with on the surface of polarizer.
Pressure-sensitive adhesive A: in butyl acrylate and acrylic acid multipolymer, cooperate urethane acrylate oligomer, and further add the isocyanates crosslinking chemical and obtain organic solvent solution, this organic solvent solution coated by the die type coating machine carried out making that dried thickness is 15 μ m, the sheet tackifier that obtains thus on the demoulding treated side of polyethylene terephthalate film (partition) that thickness that the demoulding handles is 38 μ m.
The energy storage elastic modulus of formation of pressure-sensitive adhesive layer is 0.40MPa at 23 ℃, is 0.18MPa at 80 ℃.
Pressure-sensitive adhesive B: the thickness that has carried out demoulding processing is that the demoulding treated side of the polyethylene terephthalate film (partition) of 38 μ m is provided with the commercially available sheet tackifier that thickness is the acrylic compounds formation of pressure-sensitive adhesive layer of 15 μ m.Do not cooperate urethane acrylate oligomer.The energy storage elastic modulus of this formation of pressure-sensitive adhesive layer is 0.05Ma at 23 ℃, is 0.04MPa at 80 ℃.
Pressure-sensitive adhesive C: the thickness that has carried out demoulding processing is that the demoulding treated side of the polyethylene terephthalate film (partition) of 38 μ m is provided with the commercially available sheet tackifier that thickness is the acrylic compounds formation of pressure-sensitive adhesive layer of 15 μ m.Do not cooperate urethane acrylate oligomer.The energy storage elastic modulus of this formation of pressure-sensitive adhesive layer is 0.10Ma at 23 ℃, is 0.04MPa at 80 ℃.
By iodine is on the single face of the polarizer that constitutes of the film of 25 μ m at the thickness of absorption orientation on the polyvinyl alcohol (PVA); by the tackifier that constitutes by the aqueous solution that contains polyvinyl alcohol (PVA) and water-soluble epoxy resin; pasting thickness is the diaphragm of the tri acetyl cellulose membrane formation of 40 μ m, has prepared Polarizer thus.This polyvinyl alcohol film one side is pasted pressure-sensitive adhesive A, obtains the thin polarizer corresponding to Fig. 1.
In addition, prepare the polarizer of band pressure-sensitive adhesive, the phase retardation film that the norborneol resinoid that its phase differential in thickness 40 μ m, face is 140nm constitutes (" the エ ス シ one Na イ Le system " that Sekisui Fine Chemical Co., Ltd. makes, the acrylic compounds pressure-sensitive adhesive of thickness 25 μ m is set on single face trade name), and its surface forms with the partition covering.After the partition of the thin polarizer that before obtained peeled off, paste the side that the acrylic compounds pressure-sensitive adhesive is not set of the polarizer of above-mentioned band pressure-sensitive adhesive in its formation of pressure-sensitive adhesive layer one side, make its optic axis at 45, made the slim composite polarizing plate corresponding with Fig. 2 with respect to the polarisation absorption axes clockwise direction of Polarizer.The gross thickness of the slim composite polarizing plate that obtains is 148 μ m except that the most surperficial partition, and the weight of unit area is 17.55mg/cm
2
Comparative example 1
On the two sides of the polarizer that the identical polyvinyl alcohol film with embodiment 1 use constitutes; by the tackifier that constitutes by the aqueous solution that contains polyvinyl alcohol (PVA) and water-soluble epoxy resin; pasting thickness respectively is the diaphragm of the tri acetyl cellulose membrane formation of 40 μ m, has prepared Polarizer thus.On its single face, paste pressure-sensitive adhesive B, peel off the partition of pressure-sensitive adhesive B then, in the side that the acrylic compounds pressure-sensitive adhesive is not set that this formation of pressure-sensitive adhesive layer one side is pasted the polarizer of the identical band pressure-sensitive adhesive that uses with embodiment 1, made the composite polarizing plate corresponding with Fig. 4.The formation of this composite polarizing plate is the typical example of general commercially available existing composite polarizing plate.The gross thickness of the slim composite polarizing plate that obtains is 188 μ m except that the most surperficial partition, and the weight of unit area is 21.18mg/cm
2
Comparative example 2
Except in embodiment 1, will the pressure-sensitive adhesive that disposes between polarizer and the polarizer changes to pressure-sensitive adhesive B, having made slim composite polarizing plate similarly to Example 1.
Comparative example 3
Except in embodiment 1, will the pressure-sensitive adhesive that disposes between polarizer and the polarizer changes to pressure-sensitive adhesive C, having made slim composite polarizing plate similarly to Example 1.
Then, for the composite polarizing plate of embodiment 1 and comparative example 1～3 making, according to aforesaid determination of test method size changing rate.The energy storage elastic modulus of the formation of pressure-sensitive adhesive layer that is provided with on the weight of the gross thickness of measurement result and each composite polarizing plate, unit area and the polarizer is shown in Table 1 in the lump.
Table 1
| Example No. | Pressure-sensitive adhesive | Gross thickness | Weight | The energy storage elastic modulus | Size changing rate | |
| 23℃ | 80℃ | |||||
| Embodiment 1 | A | 148μm | 17.55mg/cm 2 | 0.41MPa | 0.19MPa | 1.5％ |
| Comparative example 1 comparative example 2 comparative examples 3 | B B C | 188μm 147μm 148μm | 21.18mg/cm 2 - - | 0.05MPa 0.05MPa 0.10MPa | 0.04MPa 0.04MPa 0.04MPa | 1.9％ 2.0％ 2.1％ |
As can be seen from Table 1; the of the present invention slim composite polarizing plate that embodiment 1 obtains; compare with the example comparative example 1 of existing composite polarizing plate; has the polymer film (polarizer) of phase differential as protective seam by lamination; can reduce the formation sheet number of composite polarizing plate, thereby realize slim light weight.In addition, size changing rate when under 85 ℃ hot conditions, placing, adopting the comparative example 2 of identical formation and 3 slim composite polarizing plate with embodiment 1 except that the formation of pressure-sensitive adhesive layer difference is more than 2.0%, and existing composite polarizing plate (comparative example 1) is 1.9%, relative therewith, the composite polarizing plate of embodiment 1 is 1.5%, can efficiency confirmed ground suppressed the change in size of polarizer.Therefore, Polarizer of the present invention and composite polarizing plate can be kept favorable durability.
Claims (8)
1. a Polarizer wherein, is provided with formation of pressure-sensitive adhesive layer on the single face at least of polarizer, and this formation of pressure-sensitive adhesive layer shows the energy storage elastic modulus of 0.15～1MPa under 23～80 ℃ temperature range.
2. the described Polarizer of claim 1 wherein, is provided with described formation of pressure-sensitive adhesive layer on the single face of polarizer, and on another face of polarizer the protective seam that comprises transparent resin film is set.
3. claim 1 or 2 described Polarizers, wherein, polarizer is dichromatism pigment absorption orientation and polarizer of obtaining on polyvinyl alcohol tree film.
4. the described Polarizer of claim 1, wherein, the thickness of formation of pressure-sensitive adhesive layer is 1～40 μ m.
5. composite polarizing plate, wherein, at the formation of pressure-sensitive adhesive layer one side configuration polymer film of the described Polarizer of claim 1.
6. the described composite polarizing plate of claim 5, wherein, polymer film has phase differential in the face.
7. composite polarizing plate, wherein, the optical layers of other display optical function of lamination on described Polarizer of claim 1 or the described composite polarizing plate of claim 5.
8. image display device, it has image-displaying member, and described Polarizer of claim 1 or the described composite polarizing plate of claim 5.
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| CN105467496A (en) * | 2014-09-30 | 2016-04-06 | 住友化学株式会社 | Polarizing plate and process for producing the same |
| CN105866872A (en) * | 2015-02-11 | 2016-08-17 | 东友精细化工有限公司 | Highly durable polarizing plate and display device comprising the same |
| CN108291995A (en) * | 2015-12-10 | 2018-07-17 | 东友精细化工有限公司 | Composite polarizing plate and image display comprising the composite polarizing plate |
| CN107526206A (en) * | 2016-06-21 | 2017-12-29 | 住友化学株式会社 | Polarize board component |
| WO2020192211A1 (en) * | 2019-03-26 | 2020-10-01 | 惠州市华星光电技术有限公司 | Polarizer and manufacture methods therefor |
Also Published As
| Publication number | Publication date |
|---|---|
| TWI509297B (en) | 2015-11-21 |
| JP2008197309A (en) | 2008-08-28 |
| KR101505194B1 (en) | 2015-03-24 |
| KR20080075779A (en) | 2008-08-19 |
| JP5082480B2 (en) | 2012-11-28 |
| CN105487158A (en) | 2016-04-13 |
| TW200900757A (en) | 2009-01-01 |
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Application publication date: 20080820 |