CN1616996A - Polarized film, polarized sheet and method for producing optical laminate - Google Patents
Polarized film, polarized sheet and method for producing optical laminate Download PDFInfo
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- CN1616996A CN1616996A CNA2004100851630A CN200410085163A CN1616996A CN 1616996 A CN1616996 A CN 1616996A CN A2004100851630 A CNA2004100851630 A CN A2004100851630A CN 200410085163 A CN200410085163 A CN 200410085163A CN 1616996 A CN1616996 A CN 1616996A
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- film
- aqueous solution
- boric acid
- boronic acid
- acid containing
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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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/30—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers
- B32B27/306—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers comprising vinyl acetate or vinyl alcohol (co)polymers
-
- 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
- G02F1/133528—Polarisers
-
- 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)
- Nonlinear Science (AREA)
- Mathematical Physics (AREA)
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Polarising Elements (AREA)
- Laminated Bodies (AREA)
Abstract
The present invention relates to a manufacturing method of a polarizing film, a manufacturing method of a polarizing plate and a manufacturing method of an optical laminated body, capable of attaining more neutral black display. Regarding the manufacturing method of the polarizing film which is obtained by performing the adsorption orientation of iodine to a polyvinyl alcohol based film, thereafter, immersing the film in water solution containing boric acid with multiple stages, the water solution is water solution(1)containing 3 to 10 pts.wt. of boric acid and 1 to 20 pts.wt. of iodide to 100 pts.wt of water, and whose temperature is 50 to 70 DEG. C, and water solution(2)containing 1 to 5 pts.wt. of boric acid and 3 to 30 pts.wt.of iodine to 100 pts.wt of water, and whose temperature is 10 to 45 DEG. C, and the film is processed in the water solution(1)containing the boric acid, next, processed in the water solution(2)containing the boric acid, and the the iodide concentration in the water solution(2)is higher than that of the water solution(1), and also, the boric acid concentration in the solution(2)is lower than that of the solution(1), besides, the temperature of the solution(2)is lower than that of the solution(1).
Description
[technical field]
The present invention relates to a kind ofly can to show the preparation method of the polarization film of more neutral black, the preparation method of the polaroid of lamination protective film at least one face of this polarization film; in addition; also relate to phase-contrast film; brightness improving film, rink corner improve independent or multiple being bonded together of in film and the semi-reflective film any and make the preparation method of optical laminate.
[background technology]
As polarization film, all the time, all be to use and on the polyvinyl alcohol film, make the directed material of dichromatism pigment absorption.That is to say that the known iodine that uses is as the iodine class polarization film of dichromatism pigment with use dichroic dye as the dye class polarization film of dichromatism pigment etc.Usually, by following operation, these polarization films are made polaroid; On the one or both sides of above-mentioned polarization film, the tackifier that utilizes the aqueous solution by polyvinyl alcohol resin to constitute, protective films such as applying triacetyl cellulose.
In addition, in borated aqueous solution, carry out dip treating in addition after, in the aqueous solution of iodide, carry out the situation of dip treating again.For example, in patent documentation 1, the polyvinyl alcohol film is dyeed with the dichromatism pigment, after in borated aqueous solution, carrying out dip treating, in the aqueous solution of the iodide of normal concentration, utilize official hour to carry out dip treating, through super-dry, thus the preparation polarization film.According to patent documentation 1, carry out dip treating by the aqueous solution of using iodide, can prevent from from film, to separate out boric acid, overcome shortcomings such as spot and impurity.
In addition, in the embodiment 1 of patent documentation 2, after the polyvinyl alcohol film dyeed, in the aqueous solution of boric acid concentration 3.5 weight % and potassium iodide concentration 1.5 weight %, stretch, then, in the aqueous solution of boric acid concentration 6 weight % and potassium iodide concentration 1.5 weight %, carry out dip treating again, through super-dry, thus the preparation polarization film.According to patent documentation 2, utilize the different treatment step more than 2 of boric acid concentration, water tolerance, humidity resistance, permanance, optical characteristics are improved.
Yet, in the preparation method of up to now polarization film, do not obtain fully satisfying the polarization film of optical characteristics, for example, there is problems such as having green or redness in the black, therefore, need a kind of polarization film that can show neutral more black.
[patent documentation 1] spy opens the 2001-290027 communique
[patent documentation 2] spy opens flat 07-198939 communique
[content of invention]
[problem that invention will solve]
Problem of the present invention provides preparation method, the preparation method of polaroid and the preparation method of optical laminate of the polarization film that can show neutral more black.
[solving the method for problem]
Present inventors are in order to solve above-mentioned problem, carried out meticulous research repeatedly, found that the following new fact: after iodine absorption is oriented to the polyvinyl alcohol film, when in borated aqueous solution, carrying out the dip treating of multistep, when using with respect to the processing that utilizes the 1st kind of boronic acid containing aqueous solution, the concentration of utilizing iodide is higher and boric acid concentration is lower, contain the lower aqueous solution of boric acid and iodide and temperature, when carrying out the processing of the 2nd kind of boronic acid containing aqueous solution, resulting polarization film can show neutral more black, so far finishes the present invention.
Promptly, the preparation method of polarization film of the present invention is, after iodine absorption is oriented to the polyvinyl alcohol film, in borated aqueous solution, carry out the multistep dip treating and form the preparation method of polarization film, it is characterized in that: borated aqueous solution is, (1) with respect to the water of 100 weight portions, contain the boric acid of 3-10 weight portion and the iodide of 1-20 weight portion, and temperature is 50-70 ℃ a aqueous solution, and (2) are with respect to the water of 100 weight portions, contain the boric acid of 1-5 weight portion and the iodide of 3-30 weight portion, and temperature is 10-45 ℃ a aqueous solution, handles in the boronic acid containing aqueous solution of (1), then handles in the boronic acid containing aqueous solution of (2), at this moment, compare with the boronic acid containing aqueous solution of (1), the iodide concentration of the boronic acid containing aqueous solution of (2) is higher, and the concentration of boric acid is lower, in addition, temperature is also lower.
Among the present invention, preferred multistep ground uses the processing of the boronic acid containing aqueous solution of the processing of boronic acid containing aqueous solution of (1) and/or use (2).
In addition, the preparation method of polaroid of the present invention is characterized in that, bonding protective film at least one face of above-mentioned polarization film.This protective film can have phase-contrast film, brightness improving film, rink corner and improve any function in film and the semi-reflective film.Perhaps, also can be on the above-mentioned polaroid that is bonded with protective film at least one face, the bonding phase difference film, brightness improving film, rink corner of being selected from improves at least a film in film and the semi-reflective film and prepares optical laminate.
[effect of invention]
According to the present invention, when in the boronic acid containing aqueous solution, carrying out the multistep dip treating, when using iodide concentration to be higher than the processing that utilizes the 1st kind of boronic acid containing aqueous solution, and boric acid concentration is lower than the processing of the 1st kind of moisture boric acid aqueous solution and contains boric acid and aqueous solution iodide, that temperature is lower, utilize the processing of the 2nd kind of boronic acid containing aqueous solution, the complementary color effect can be improved, thereby a kind of polarization film and polaroid that can show neutral more black can be obtained.Be applied to liquid crystal indicator by polaroid, the optical laminate that will utilize the present invention to obtain, can make slim, high-quality LCD.
[best mode that carries out an invention]
Form the polyvinyl alcohol resin of polyvinyl alcohol film of the present invention, generally can enumerate the resin that obtains by saponification polyvinyl acetate resinoid.Saponification degree is more than the 85mol%, is preferably more than the 90mol%, more preferably 99mol%-100mol%.As the polyvinyl acetate resinoid, except polyvinyl acetate, can also be vinyl acetate and the interpolymer that can carry out other monomer of copolymerization with it as vinyl acetate list aggressiveness, for example, can enumerate ethane-acetic acid ethyenyl interpolymer etc.As other monomers that can carry out copolymerization, for example, can enumerate unsaturated carboxylic acid class, olefines, vinyl ethers, unsaturated sulfonic acid etc.The degree of polymerization of polyvinyl alcohol resin is 1000-10000, is preferably about 1500-5000.
Can also carry out modification to these polyvinyl alcohol resins, for example, can also use by aldehydes and carry out modified polyethylene alcohol formal, polyvinyl acetal, polyvinyl butyral etc.Generally, as the parent material of making polarization film, used thickness is 20 μ m-100 μ m, be preferably 30 μ m-80 μ film m, that the polyvinyl alcohol resin film is not stretched.Industrial, width is that the film of 1500mm-4000mm is practical.
Successively this non-stretched film is carried out that expansion process, dyeing are handled, boric acid is handled, carrying out washing treatment, carry out drying at last and the thickness of the polyvinyl alcohol polarization film that makes, for example be about about 5-50 μ m.
Polarization film of the present invention is to make the directed polyvinyl alcohol single axle drawn membrane of iodine absorption, as its manufacture method, roughly is divided into 2 kinds.The 1st kind of method be, in air or inert gas, polyvinyl alcohol (PVA) carried out uniaxial tension after, carry out successively that expansion process, dyeing are handled, boric acid is handled and washing is handled, and carries out dry method at last.The 2nd kind of method is, in aqueous solution, successively the polyvinyl alcohol film that does not stretch is carried out expansion process, dyeing processing, boric acid processing and carrying out washing treatment, in the step before boric acid treatment step and/or boric acid treatment step, carry out the wet type uniaxial tension, carry out dry method at last.
In any one method, can in 1 step, carry out uniaxial tension, also can in the step more than 2, carry out uniaxial tension, preferably in a plurality of steps, carry out uniaxial tension.For drawing process, can adopt known method, for example, the difference between 2 nip rolls of control handle thin films and stretching between the roller that stretches, as specially permit heat roller tube pulling method that No. 2731813 communiques put down in writing, tentering pulling method etc.In addition, the order of step is basically according to order as described above, for the quantity for the treatment of fluid and treatment conditions without limits.In addition, can certainly insert the step that does not have record in the above-mentioned steps for other purposes.
Expansion step for the impurity of removing film surface, remove plastifier in the film, provide the easy dyeing in the subsequent step, the plasticized of film etc. to carry out.Treatment conditions are set in the scope of defectives such as the excessive dissolution that can reach these purposes and not produce the base material film, the forfeiture transparency.In default gas, make under the situation that oriented film expands, for example, 20 ℃-70 ℃, be preferably in 30-60 ℃ the aqueous solution and flood.The dip time of film is 30 seconds-300 seconds, and more preferably 60-240 is about second.From making at first not under the situation that the raw films that stretches expands, for example, 10 ℃-50 ℃, be preferably in 20-40 ℃ the aqueous solution and flood film.The dip time of film is 30 seconds-300 seconds, and more preferably 60-240 is about second.
In the expansion process operation, the problems such as easily on film, producing CREASE MARK because the film broad ways expands, preferred use tentering roll (expander roll), spiral roll (spiral roll), roll (crownroll), cloth guider (cross guider), curved rod (bend bar), expanding folder known expanding devices such as (tenter clip) on one side and eliminate the CREASE MARK of film, on one side handle thin films.For handle thin films stably in solution, utilize shower in the water to control current in the expansion solutions, be of great use perhaps and with EPC device (marginal position control device: detect the edge of film and prevent the device of film complications) etc.In this operation, film also enlarges along the direction expansion of film operation, and is sagging for the film of eliminating throughput direction, for example, preferably takes the methods such as speed of carrying roller before and after the control and treatment.In addition, for the expansion process liquid that uses, except pure water, can also use the aqueous solution of the boric acid that adds 0.01 weight %-10 weight % (opening as described in the flat 10-153709 communique), chloride (opening as described in the flat 06-281816 communique), mineral acid, inorganic salts, water-miscible organic solvent, alcohols etc. as the spy as the spy.
The step of using iodine to dye is for iodine is adsorbed on the film, and makes it directed and carry out.Treatment conditions are set in the scope of defectives such as the excessive dissolution that can reach these purposes and not cause the base material film, the forfeiture transparency.For example, 10 ℃-45 ℃, be preferably under 20 ℃-35 ℃ the temperature, and in weight ratio, under the concentration of iodine/KI/ water=0.003-0.2/0.1-10/100, carry out 30 seconds-600 seconds, be preferably 60 seconds-300 seconds dip treating.Can use other iodide to replace potassium, for example zinc iodide etc.In addition, other iodide and potassium iodide can be used simultaneously.In addition, can also make iodide compound coexistence in addition, for example boric acid, protochloride lead, cobalt chloride.Add under the situation of boric acid, containing on the iodine this point, be different from following boric acid and handle.The water of relative 100 weight portions as long as contain the above iodine of 0.003 weight portion, just can be regarded staining trough as.
As mentioned above, can also in staining trough, make film stretching.Stretching utilizes the nip rolls make before and after the staining trough to have method such as difference to carry out.In addition, also can with expansion step similarly in dyeing liquor and/or the solution gateway tentering roll, spiral roll, roll, cloth guider, curved rod etc. are set.In addition, after the expansion step, can before handling, dyeing carry out the wet type stretch processing to the polyvinyl alcohol film.
Among the present invention, the dip treating of utilizing the boronic acid containing aqueous solution is that multistep is carried out.The 1st kind of boronic acid containing aqueous solution is (1) water with respect to 100 weight portions, contains the boric acid of 3-10 weight portion and the iodide of 1-20 weight portion, and temperature is 50-70 ℃ a aqueous solution.Can also and boric acid use simultaneously borax, glyoxal, crosslinking chemical such as glutaraldehyde.As iodide, can enumerate potassium iodide, zinc iodide etc., usually, use potassium iodide.In addition, can also make iodide compound coexistence in addition, for example zinc chloride, cobalt chloride, zirconium chloride, sodium thiosulfate, potassium sulfite etc.
The temperature of the 1st all boronic acid containing aqueous solution is generally 50 ℃-70 ℃, preferred 55 ℃-65 ℃.Dip time is generally 30-600 about second, is preferably 60-420 second, more preferably 90-300 second.If temperature is lower than 50 ℃, be difficult to obtain final optical characteristics, on the contrary,, will damage appearance of films in case surpass 70 ℃, both are all undesirable.
The processing of the 1st kind of boronic acid containing aqueous solution can also utilize 2-4 such operation multistep to carry out.The aqueous solution of each situation is formed, temperature, can be identical in above-mentioned scope, and also can be different.
The 2nd kind of boronic acid containing aqueous solution is (1) water with respect to 100 weight portions, contains the boric acid of 1-5 weight portion and the iodide of 3-30 weight portion, the aqueous solution that temperature is 10-45 ℃.Dip time is preferably 2-120 about second.
In the present invention, the 1st kind of borated aqueous solution and the 2nd kind of borated aqueous solution are to satisfy the solution of above-mentioned concentration and temperature range, the 2nd kind of borated aqueous solution must be than the concentration height of the iodide of the 1st kind of boronic acid containing aqueous solution, and the concentration of boric acid is lower and temperature is lower.
The iodide concentration of the 2nd kind of boronic acid containing aqueous solution is lower than under the situation of iodide concentration of the 1st kind of boronic acid containing aqueous solution, can not obtain neutral tone.The boric acid concentration of the 2nd kind of boronic acid containing aqueous solution is higher than under the situation of boric acid concentration of the 1st kind of boronic acid containing aqueous solution, has the danger of separating out boric acid and forming foreign matter.In addition, under the temperature of the 2nd kind of boronic acid containing aqueous solution and the identical or higher situation of the boric acid temperature of the 1st kind of boronic acid containing aqueous solution, just can not obtain neutral tone.
The processing of the 2nd kind of boronic acid containing aqueous solution also can be the same with the processing of the 1st kind of boronic acid containing aqueous solution, undertaken by 2-4 such operation multistep.Like this, the concentration of iodide and boric acid all must preferably make the iodide concentration of later step identical or higher with the iodide concentration of preceding step, and make the concentration of boric acid identical with preceding step or lower with temperature in above-mentioned concentration range in each step.
Utilize the processing of these boronic acid containing aqueous solution, in order to implement by crosslinked preventing hydration and color and luster adjusting (preventing to have green etc.) etc.The processing of the 1st kind of above-mentioned boronic acid containing aqueous solution mainly is in order to carry out preventing hydration, also to be referred to as titles such as preventing hydration processing, crosslinking Treatment, localization process.In addition, the processing of the 2nd kind of above-mentioned boronic acid containing aqueous solution mainly is in order to carry out the color and luster adjustment, also to be referred to as titles such as the color and luster adjusting is handled, complementary color is handled, the processing of dyeing again.
After using the boronic acid containing aqueous solution to handle, film is carried out carrying out washing treatment.Carrying out washing treatment is carried out as follows, for example, will be thin film dipped in water through the polyvinyl alcohol that perboric acid is handled, with the form spray water of spray, perhaps flood simultaneously and spray.In carrying out washing treatment, water temperature can be about 2-40 ℃ usually, and dip time is 2-120 about second preferably.After the washing, in drying oven, under about 40-100 ℃ temperature, the drying steps of about 60-600 second.
Among the present invention, at least one step before expansion process, dyeing processing, boronic acid containing aqueous solution treatment step or in these steps, carry out uniaxial tension.Perhaps, can in the middle of above-mentioned steps, add the wet type stretching step that is used to carry out uniaxial tension.Uniaxial tension can carry out in a step, but preferably carries out in a plurality of steps.For drawing process, can adopt known method, for example, the difference between 2 nip rolls of control handle thin films and stretch between the roller that stretches, as speciallyying permit hot roll pulling method that No. 2731813 communiques put down in writing, expanding pulling method etc.In addition, carry out expansion step before, can in advance the polyvinyl alcohol film be carried out uniaxial tension in gases such as air or inert gas.Final accumulation stretching ratio is 4.5-7.0 times, is preferably 5.0-6.5 doubly.
On the one side at least of the polarization film for preparing like this,, thereby make polaroid with the bonding protective film of bonding agent.
As protective film, the film that can enumerate the film that constitutes by triacetyl cellulose and the such acetylcellulose resinoid of diacetyl cellulose, constitute by polyethylene terephthalate and poly-naphthalene diformazan glycol ester, the such polyester resin of polybutylene terephthalate, the film that constitutes by poly-carbonic acid resinoid, the film that constitutes by the cycloolefin resinoid.As commercially available thermoplasticity cycloolefin resinoid, for example, the Topas (registered trademark) that sells by German Ticona society, the Arton (registered trademark) that sells by JSR company, the Zeonor that sells by Japanese Zeon company and Zeonex (registered trademark), the Apel (registered trademark) that sells by Mitsui Chemicals (strain) etc.So, the film that this cycloolefin resinoid system film is obtained is made protective film, in the system film, adopt known method such as solvent casting, extrusion by melting suitably.
The cycloolefin based resin film of system film also is commercially available, for example, and by ponding chemical industry (strain) (SekisuiChemical Co., Ltd.) " the エ ス シ-Na " of Xiao Shouing and " SCA40 " etc.
The thickness of protective film is preferably thin, if but thickness is too thin, and strength degradation, processability variation on the other hand, if thickness is too thick, will produces the transparency and descend, or problem such as the set time that needs behind the lamination is elongated.Therefore, the suitable thickness of protective film for example is about 5-200 μ m, is preferably 10-150 μ m, more preferably 20-100 μ m.
In order to improve the cohesive between bonding agent and polarization film and/or the protective film; can also on polarization film and/or protective film, carry out surface treatments such as corona treatment, flame treatment, plasma treatment, ultraviolet ray irradiation, bottom coating processing, saponification processing.
On protective film, can also be separately or prevent dodging surface treatments such as (anti-glare) processing, antireflection (anti-reflection) processing, hard conating processing, antistatic treatment, antifouling processing in combination.In addition, the protective seam on protective film and/or protective film surface can also contain ultraviolet light absorber and plasticizers such as benzenephosphonic acid ester type compound, p phthalic acid esterification's compound such as benzophenone compound, benzotriazole compound.
Described protective film can be bonded on the face of polarization film, also can be bonded in two-sided on.
Use bonding agents such as hydrosolvent class bonding agent, organic solvent class bonding agent, hot melt class bonding agent, solvent-free class bonding agent, polarization film and protective film are carried out lamination.As hydrosolvent class bonding agent, for example, can enumerate polyvinyl alcohol resin aqueous solution, water system two component urethanes emulsion binders etc., as organic solvent class bonding agent, for example, can enumerate two component urethanes bonding agents etc., as solvent-free class bonding agent, for example, can enumerate a component-type urethanes bonding agent etc.Use utilizes saponification processing etc. that the adhesive surface with polarization film is carried out under the situation of acetylcellulose class film as protective film that water wettability handles, and the polyvinyl alcohol resin aqueous solution is suitable to bonding agent.In the polyvinyl alcohol resin that uses as bonding agent, the alcotex that makes except the polyvinyl acetate as vinyl acetate list aggressiveness being carried out saponification handle, also have to vinyl acetate and with it the multipolymer of other monomers of copolymerization carry out that saponification is handled and the vinyl alcohol-based copolymer that makes and those hydroxyls are carried out partially modified polyvinyl alcohol based polymer etc.In this bonding agent, can also use polyaldehyde, soluble epoxide compound, melamine compounds etc. as adjuvant.
Method for bonding polarization film and protective film; restriction especially for example, can be set forth on the surface of polarization film or protective film application of adhesive equably; on coated side, put another layer film again, and carry out bonding, dry method etc. by roll etc.
Usually, bonding agent is after modulation, applies under 15-40 ℃ temperature, and tack temperature is generally about 15-30 ℃.Carry out dried after bonding, to remove the water equal solvent that contains in bonding agent, the baking temperature of this moment is generally 30-85 ℃, is preferably 40-80 ℃.Then, can also 15-85 ℃, be preferably 20-50 ℃, more preferably under 35-45 ℃ the temperature environment, carry out 1-90 days stage solidification usually, bonding agent is solidified.If set time is longer, productive rate reduces, and therefore, be about 1-30 days set time, is preferably 1-7 days.
Therefore, can pass through adhesive phase, make the single face of polarization film or two-sided the polaroid of bonding protective film.
Among the present invention, protective film can also have function as phase-contrast film, as the function of brightness improving film, as the function of reflective film, as the function of semi-reflective film, as the function of diffusion film, as the optical functions such as function of optical compensating film.Thus; for example by on the protective film surface; optically functional films such as the function of lamination phase-contrast film, brightness improving film, reflective film, semi-reflective film, diffusion film, optical compensating film; can possess such function; in addition, bring such function can also for protective film itself.In addition, can also make protective film itself have multiple function as the diffusion film of the function with brightness improving film etc.
For example; by carrying out as speciallyying permit No. 2841377 communique, No. 3094113 described stretch processing such as communique of special permission; perhaps by carrying out as speciallyying permit No. 3168850 described processing of communique, bring function can for above-mentioned protective film as phase-contrast film.In addition; open the 2002-169025 communique as the spy and close the spy and open No. 200329030 described methods of communique and form micropore by utilizing; by the different cholesteric more than 2 layers of overlapping selective reflecting centre wavelength, bring the function of improving film as briliancy can for above-mentioned protective film again.By on above-mentioned protective film, utilizing steam or sputter to form metallic film, can bring function as reflective film or semi-reflective film.By on above-mentioned protective film, applying the resin solution that contains particulate, can bring function as diffusion film.In addition, by on above-mentioned protective film, applying liquid-crystal compounds such as デ イ ス コ ィ Star Network liquid-crystal compounds and making it directed, can bring function as optical compensating film.In addition, can also use suitable adhesive, directly with trade name: DBEF brightness improving film, trade names such as (ス リ-エ system (strain) are produced): commercially available optically functional films such as WV film field angle improved thin film, trade name: Sumikalight (registered trademark) (Sumitomo Chemical (strain)) such as (Fuji's photograph film (strain) productions) equiphase difference film directly are bonded on the polarization film.
Below, the present invention will be described in more detail by embodiment, but the present invention is not limited to these embodiment.
Following embodiment and comparative example carry out according to following steps: on one side with the continuous conveying device of combination nip rolls and free roll, carry the long film of polyvinyl alcohol (PVA), Yi Bian carry out various processing.Uniaxial extension be by before and after the control and treatment groove the difference of drive pressure material roller carry out.
And, optical property is meant: make among the UV visual spectrophotometer UV2450 of society of institute manufacturing in (strain) Tianjin, island, be provided as optional accessory " film loader of polariscope is housed ", and measure through the UV visual spectrum of direction with the polaroid that absorbs direction, color and luster when 2 polaroids are arranged in the intersection Nicol, with JIS-Z8729 is standard, calculates and try to achieve quadrature color and luster, quadrature L
*, quadrature a
*, quadrature b
*
[embodiment 1]
With thickness is polyvinyl alcohol film (the Network ラ レ PVC PVC ニ ロ Application VF-PS#7500 of 75 μ m, the degree of polymerization 2400,99.9 moles of saponification degrees are more than the %) about 130 seconds of dipping in 30 ℃ pure water, lax and make film keep tense situation in order to make film, film is expanded fully.Then, on one side the processing of will thin film dipped weight ratio at iodine/potassium iodide/water dyeing in the aqueous solution that is 0.02/1.5/100, uniaxial tension carries out on one side.
Afterwards, on one side will thin film dipped weight ratio be 10/5/100 at potassium iodide/boric acid/water, temperature is to carry out dip treating in 60 ℃ the boric acid aqueous solution, carries out uniaxial tension on one side, is original 5.9 times up to the stretching ratio of accumulating.In addition, again film is 20/3/100 in the weight ratio of potassium iodide/boric acid/water, temperature is that dipping steeped and soaks processing in about 30 seconds in 30 ℃ second boric acid aqueous solution.Then, wash about 10 seconds with 10 ℃ pure water.Descended dry 2 minutes 60 ℃ of temperature, make polarization film.
The optical property of this polarization film is quadrature a
*=0.2, quadrature b
*=-0.3, and be the neutral more polarization film of color and luster.
[embodiment 2]
Except the processing of the 2nd kind of boronic acid containing aqueous solution be previous step with the weight ratio of potassium iodide/boric acid/water be 15/3/100, temperature is 40 ℃ aqueous solution, back one step with the weight ratio of potassium iodide/boric acid/water be 20/3/100, temperature be 30 ℃ aqueous solution two go on foot carry out beyond, make polarization film similarly to Example 1.
The optical property of this polarization film is quadrature a
*=0.1, quadrature b
*=-0.1, and be the neutral more polarization film of color and luster.
[comparative example 1]
Weight ratio that remove to use potassium iodide/boric acid/water is 20/0.5/100, temperature is 30 ℃ aqueous solution, utilizes beyond the processing of the 2nd kind of boronic acid containing aqueous solution, makes polarization film similarly to Example 1.
The optical property of this polarization film is quadrature a
*=0.6, quadrature b
*=-1.8, and demonstrate viridant black.
[comparative example 2]
Weight ratio that remove to use potassium iodide/boric acid/water is 10/0/100, temperature is 30 ℃ aqueous solution, utilizes beyond the processing of the 2nd kind of boronic acid containing aqueous solution, makes polarization film similarly to Example 1.
The optical property of this polarization film is positive a
*=1.3, quadrature b
*=-4.1, and demonstrate viridant black.
[comparative example 3]
Weight ratio that remove to use potassium iodide/boric acid/water is 10/7.5/100, temperature is 30 ℃ aqueous solution, utilize beyond the processing of the 2nd kind of boronic acid containing aqueous solution, make polarization film similarly to Example 1, yet on the roll of taphole, have boric acid to separate out, after the drying, produce foreign matter.
[comparative example 4]
Weight ratio that remove to use potassium iodide/boric acid/water is 1/5/100, temperature is 30 ℃ aqueous solution, utilizes beyond the processing of the 2nd kind of boronic acid containing aqueous solution, makes polarization film similarly to Example 1.
The optical property of this polarization film is quadrature a
*=0.6, quadrature b
*=-1.5, demonstrate the black that has green.
[comparative example 5]
Weight ratio that remove to use potassium iodide/boric acid/water is 20/3/100, temperature is 60 ℃ aqueous solution, utilizes beyond the processing of the 2nd kind of boronic acid containing aqueous solution, makes polarization film in the same manner with embodiment 1.
The optical property of this polarization film is quadrature a
*=0.8, quadrature b
*=-2.5, demonstrate the black that has green.
Claims (5)
1. the preparation method of a polarization film that comprises the steps, after being oriented in iodine absorption on the polyvinyl alcohol film, in borated aqueous solution, carry out the multistep dip treating, thereby make polarization film, it is characterized in that: borated aqueous solution comprises (1) water with respect to 100 weight portions, contain the boric acid of 3-10 weight portion and the iodide of 1-20 weight portion, temperature is 50-70 ℃ a aqueous solution, and (2) are with respect to the water of 100 weight portions, contain the boric acid of 1-5 weight portion and the iodide of 3-30 weight portion, temperature is 10-45 ℃ a aqueous solution, after handling through (1) boronic acid containing aqueous solution, when handling by the boronic acid containing aqueous solution of (2) again, compare with the boronic acid containing aqueous solution of (1), the iodide concentration of the boronic acid containing aqueous solution of (2) is higher, and the concentration of boric acid is lower, in addition, temperature is also lower.
2. the preparation method of the described polarization film of claim 1 is characterized in that: utilizing the processing of the boronic acid containing aqueous solution of the processing of boronic acid containing aqueous solution of (1) and/or utilization (2) is to carry out through multistep.
3. the preparation method of polaroid is characterized in that: its one side at least that is included in the polarization film that utilizes claim 1 or 2 described methods and make goes up the step of bonding protective film.
4. the preparation method of the described polaroid of claim 3, wherein, above-mentioned protective film has phase-contrast film, brightness improving film, rink corner and improves in film and the semi-reflective film any function.
5. the preparation method of optical laminate is characterized in that: on the polaroid that makes utilizing the method described in the claim 3, bondingly be selected from least a film that phase-contrast film, brightness improving film, rink corner improve film and semi-reflective film.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP318419/03 | 2003-09-10 | ||
| JP318419/2003 | 2003-09-10 | ||
| JP2003318419A JP2005084507A (en) | 2003-09-10 | 2003-09-10 | Manufacturing method of polarizing film, manufacturing method of polarizing plate and manufacturing method of optical laminated body |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1616996A true CN1616996A (en) | 2005-05-18 |
| CN100388024C CN100388024C (en) | 2008-05-14 |
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| CNB2004100851630A Active CN100388024C (en) | 2003-09-10 | 2004-09-08 | Polarized film, polarized sheet and method for producing optical laminate |
Country Status (4)
| Country | Link |
|---|---|
| JP (1) | JP2005084507A (en) |
| KR (1) | KR101137677B1 (en) |
| CN (1) | CN100388024C (en) |
| TW (1) | TWI429941B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI650584B (en) * | 2015-04-17 | 2019-02-11 | 日商日東電工股份有限公司 | Polarizing element, polarizing plate, and manufacturing method of polarizing element |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| KR101008230B1 (en) * | 2006-06-27 | 2011-01-17 | 금오공과대학교 산학협력단 | Polarizing film and Manufacturing method for the same |
| WO2016167060A1 (en) * | 2015-04-17 | 2016-10-20 | 日東電工株式会社 | Polarizer, polarizing plate, and method for producing polarizer |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5476171A (en) * | 1977-11-29 | 1979-06-18 | Mitsubishi Electric Corp | Production of polarizing film |
| JPH10170721A (en) | 1996-12-09 | 1998-06-26 | Tokai Rubber Ind Ltd | Production of polarizing film |
| JP3632387B2 (en) * | 1997-07-31 | 2005-03-23 | 住友化学株式会社 | Manufacturing method of polarizing film |
| KR100866005B1 (en) * | 2001-09-28 | 2008-10-29 | 닛토덴코 가부시키가이샤 | Polarization plate, method for manufacturing the same and liquid crystal display device |
| JP2003240945A (en) * | 2002-02-14 | 2003-08-27 | Nitto Denko Corp | Method for manufacturing polarizer, polarizer, polarizing plate, and image display device |
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2003
- 2003-09-10 JP JP2003318419A patent/JP2005084507A/en active Pending
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2004
- 2004-08-30 TW TW093126079A patent/TWI429941B/en active
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| TWI650584B (en) * | 2015-04-17 | 2019-02-11 | 日商日東電工股份有限公司 | Polarizing element, polarizing plate, and manufacturing method of polarizing element |
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| Publication number | Publication date |
|---|---|
| TW200510756A (en) | 2005-03-16 |
| KR20050026859A (en) | 2005-03-16 |
| TWI429941B (en) | 2014-03-11 |
| JP2005084507A (en) | 2005-03-31 |
| CN100388024C (en) | 2008-05-14 |
| KR101137677B1 (en) | 2012-04-20 |
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