WO2015099267A1 - 광학 물성이 우수한 박형 편광자, 그 제조 방법 및 이를 포함하는 편광판 - Google Patents
광학 물성이 우수한 박형 편광자, 그 제조 방법 및 이를 포함하는 편광판 Download PDFInfo
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- WO2015099267A1 WO2015099267A1 PCT/KR2014/008841 KR2014008841W WO2015099267A1 WO 2015099267 A1 WO2015099267 A1 WO 2015099267A1 KR 2014008841 W KR2014008841 W KR 2014008841W WO 2015099267 A1 WO2015099267 A1 WO 2015099267A1
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- film
- polyvinyl alcohol
- stretching
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- swelling
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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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
- B29D11/00—Producing optical elements, e.g. lenses or prisms
- B29D11/00634—Production of filters
- B29D11/00644—Production of filters polarizing
Definitions
- the present invention relates to a thin polarizer having a thickness of 10 ⁇ m or less, a manufacturing method thereof, and a polarizing plate including the same, and more particularly, to a thin polarizer having a thin and excellent optical physical property, a manufacturing method thereof, and a polarizing plate including the same.
- the polarizer used in the polarizing plate is an optical element for making natural light or arbitrary polarization into a polarized light in a specific direction, and is widely used in a display device such as a liquid crystal display device and an organic light emitting device (OLED).
- a polarizer used in the display device a polyvinyl alcohol polarizing film in which molecular chains containing an iodine compound or a dichroic dye are oriented in a constant direction is generally used.
- the polyvinyl alcohol polarizing film is prepared by a method of dyeing and crosslinking iodine or dichroic dye on a polyvinyl alcohol-based film, and stretching in a predetermined direction, wherein the stretching process is an aqueous solution of boric acid or an iodine solution. It may be performed by wet stretching performed in solution or dry stretching performed in air.
- stretching exceeds 60 micrometers.
- polarizers are also required to have a thinner thickness.
- a polyvinyl alcohol-based film having a thickness before stretching of more than 60 ⁇ m as in the prior art there is a limit in reducing the thickness of the polarizer. Therefore, studies have been attempted to fabricate thinner polarizers.
- Korean Unexamined Patent Publication No. 2010-0071998 discloses a method of manufacturing a thin polarizing plate using a laminate prepared by coating a hydrophilic polymer layer on a substrate layer or co-extrusion of a substrate layer forming material and a hydrophilic polymer layer forming material. It is.
- the separation of the polyvinyl alcohol layer and the base layer is not easy after stretching and a high peel force is required for the separation, the polyvinyl alcohol layer is damaged or deformed during the separation process. Problems tend to occur, and as a result, there is a problem that optical properties such as polarization degree of the polyvinyl alcohol film are inferior.
- the polyvinyl alcohol resin is manufactured by melting and extruding the polyvinyl alcohol resin or by applying the coating solution after coating and then applying the polyvinyl alcohol according to extrusion conditions, coating conditions or film forming conditions.
- the physical properties of the film tend to change, and not only the physical properties of the finally produced polyvinyl alcohol are lowered, but also it is difficult to realize uniform physical properties.
- the present invention is to solve the above problems, and to provide a method for producing a thin polarizer with excellent productivity while having excellent optical properties.
- the present invention comprises the steps of: attaching a polyvinyl alcohol-based film using at least one surface of the polymer film using an attractive force or an adhesive to form a film laminate; Swelling the film laminate so that the swelling degree of the polyvinyl alcohol-based film is 0.36 to 0.44; Dyeing at least one of iodine and a dichroic dye onto the film stack; And it provides a method for producing a thin polarizer comprising the step of stretching the film laminate.
- the step of swelling the film laminate is preferably performed to satisfy the following formula (2) when the swelling tank residence time is t seconds.
- Equation (2) 0.36 ⁇ 0.105 ⁇ t 0.5 ⁇ 0.44
- the polyvinyl alcohol-based film is preferably a thickness of about 10 ⁇ m to 60 ⁇ m.
- the stretching step may be performed at a draw ratio of 5 to 15 times, it may be carried out at a temperature of 45 °C to 55 °C.
- the stretching may be performed in an aqueous boric acid solution having a boric acid concentration of 1 to 5%.
- the manufacturing method of the present invention after the stretching step may further comprise the step of separating the polymer film and the polyvinyl alcohol-based film and / or drying the stretched film laminate.
- the present invention provides a polyvinyl alcohol-based thin polarizer having a thickness of 10 ⁇ m or less, a single transmittance of 40% to 45%, a polarization degree of 99.9% or more, and a polarizing plate including the same. do.
- the thin polarizer prepared according to the method of the present invention has a very good optical performance with a transmittance of about 40% to 45% and a degree of polarization of 99.9% or more.
- 1 is a schematic diagram showing a method of measuring peeling strength (Texture Strenghth) using a texture analyzer (Texture Analyzer).
- 2 is a graph showing the degree of swelling degree according to the swelling tank residence time.
- the present inventors have conducted a long study to produce a polarizer excellent in optical properties while being very thin (10 ⁇ m or less) without breaking in the manufacturing process, and as a result, the degree of swelling of the polyvinyl alcohol-based film during the production of a thin polarizer is specified. It was found out that excellent optical physical properties could be obtained by controlling with, thereby completing the present invention.
- the method of manufacturing a thin polarizer comprises the steps of: attaching a polyvinyl alcohol-based film to the at least one surface of the polymer film using an attractive force or an adhesive to form a film laminate; Swelling the film laminate so that the swelling degree of the polyvinyl alcohol-based film is 0.36 to 0.44; Dyeing at least one of iodine and a dichroic dye onto the film stack; And stretching the film laminate.
- a polyvinyl alcohol-based film is attached to one side or both sides of a polymer film to form a film laminate.
- the polymer film is to prevent the polyvinyl alcohol-based film from breaking in the stretching process, preferably, may be a polymer film having a maximum draw ratio of 5 times or more under a temperature condition of 20 °C to 85 °C.
- the maximum draw ratio means a draw ratio immediately before breakage occurs.
- the stretching may be dry stretching or wet stretching, in the case of wet stretching, the stretching ratio in the case of stretching in an aqueous boric acid solution having a boric acid concentration of 1.0 to 5% by weight.
- Such polymer films include, but are not limited to, high density polyethylene films and polyurethanes. Film, polypropylene film, polyolefin film, ester film, low density polyethylene film, high density polyethylene and low density polyethylene coextrusion film, copolymer resin film containing ethylene vinyl acetate in high density polyethylene, acrylic film, polyethylene terephthalate film, polyvinyl Alcohol Film, Cellulose Film Etc. can be mentioned.
- the polyvinyl alcohol-based film is not limited thereto, but the polymerization degree is about 1,000 to 10,000, preferably 1,500 to 5,000. This is because when the degree of polymerization satisfies the above range, the molecular motion is free and can be mixed flexibly with iodine or dichroic dye.
- a commercially available polyvinyl alcohol-based film may be used.
- P30, PE30, PE60 manufactured by Kureray Corporation, M3000, M6000, manufactured by Nippon Synthetic, and the like may be used.
- the polyvinyl alcohol-based film may be an unstretched film or a stretched film as necessary, but is not limited thereto.
- the polyvinyl alcohol-based film has a thickness of about 10 to 60 ⁇ m, preferably 10 to 40 ⁇ m.
- the thickness of the polyvinyl alcohol-based film exceeds 60 ⁇ m, it is difficult to achieve a thickness of 10 ⁇ m or less even when stretched, when the thickness is less than 10 ⁇ m tends to break during stretching.
- the polymer film and the polyvinyl alcohol-based film may be attached by an adhesive, or may be attached by a weak attraction generated on the surface of the polymer film and the polyvinyl alcohol-based film without a separate medium.
- the adhesion between the polymer film and the polyvinyl alcohol-based film is 2N / 2cm or less. Preferably, it is about 0.1-1N / 2cm. This is because when the adhesion between the polymer film and the polyvinyl alcohol film satisfies the above range, the polymer film and the polyvinyl alcohol-based film are not separated in the stretching process, and surface damage may be minimized in the separation process after stretching.
- the adhesive force is an adhesive force measured when 2 cm long sample films are attached, and a specific measuring method is shown in FIG. 1.
- the adhesion between the films as shown in Figure 1, after fixing the polyvinyl alcohol film (A) of the film laminate with a sample holder (H), with respect to the surface direction of the film laminate Peel strength measured while peeling the polyvinyl alcohol film (A) from the polymer film (B) by applying a force in a vertical direction, wherein the measuring instrument is a texture analyzer (Model: TA- XT Plus) was used.
- the surface treatment may be performed through various surface treatment methods well known in the art, for example, corona treatment, plasma treatment, or surface modification treatment using a strong base aqueous solution such as NaOH or KOH.
- the thickness of the adhesive layer is preferably about 20 to 4000 nm.
- the thickness of the adhesive layer satisfies the above range, it is advantageous to peel the polyvinyl alcohol-based film without damage after the stretching and drying process.
- the adhesive is not more than 2N / 2cm
- the material is not particularly limited, various adhesives known in the art can be used without limitation.
- the adhesive layer may be formed of an aqueous adhesive or an ultraviolet curable adhesive.
- the adhesive layer may be formed by an aqueous adhesive including at least one selected from the group consisting of polyvinyl alcohol-based resins, acrylic resins, and vinyl acetate-based resins.
- the adhesive layer may be formed by an aqueous adhesive including a polyvinyl alcohol-based resin having an acrylic group and a hydroxyl group.
- the polyvinyl alcohol-based resin having an acrylic group and a hydroxyl group may have a degree of polymerization of about 500 to 1800.
- the thickness of an adhesive bond layer is about 20-1,000 nm.
- the adhesive layer may be formed of an ultraviolet curable adhesive, for example, a first epoxy compound having a glass transition temperature of homopolymer of 120 ° C. or more, a second epoxy compound having a glass transition temperature of homopolymer of 60 ° C. or less and It may be formed of an ultraviolet curable adhesive containing a cationic photopolymerization initiator.
- the UV-curable adhesive is 100 parts by weight of the first epoxy compound having a glass transition temperature of the homopolymer of 120 °C or more, 30 to 100 parts by weight of the second epoxy compound having a glass transition temperature of the homopolymer of 60 °C or less and cationic photopolymerization It may include 0.5 to 20 parts by weight of the initiator.
- an epoxy compound refers to a compound having one or more epoxy groups in a molecule, preferably a compound having two or more epoxy groups in a molecule, and is in the form of a monomer, a polymer, or a resin.
- the concept includes all of the compounds.
- the epoxy compound of the present invention may be in the form of a resin.
- the glass transition temperature of the homopolymer is an epoxy compound of 120 °C or more can be used without particular limitation, for example, the alicyclic epoxy compound and the glass transition temperature of the homo polymer is 120 °C or more and / Or aromatic epoxy may be used as the first epoxy compound of the present invention.
- Specific examples of the epoxy compound having a glass transition temperature of homopolymer of 120 ° C. or higher include 3,4-epoxycyclohexylmethyl-3,4′-epoxycyclohexanecarboxylate, vinylcyclohexenedioxide dicyclopentadiene dioxide, and bisepoxycyclo.
- the first epoxy compound is more preferably the glass transition temperature of the homopolymer is about 120 °C to 200 °C.
- the second epoxy compound may be used without particular limitation as long as the glass transition temperature of the homopolymer is an epoxy compound of 60 ° C. or less.
- an alicyclic epoxy compound, an aliphatic epoxy compound, or the like may be used as the second epoxy compound.
- alicyclic epoxy compound it is preferable to use a bifunctional epoxy compound, that is, a compound having two epoxies, and more preferably use a compound in which the two epoxy groups are both alicyclic epoxy groups. It is not limited.
- the epoxy compound which has an aliphatic epoxy group which is not an alicyclic epoxy group can be illustrated.
- polyglycidyl ether of aliphatic polyhydric alcohol Polyglycidyl ethers of alkylene oxide adducts of aliphatic polyhydric alcohols; Polyglycidyl ethers of polyester polyols of aliphatic polyhydric alcohols and aliphatic polyhydric carboxylic acids; Polyglycidyl ethers of aliphatic polyvalent carboxylic acids; Polyglycidyl ethers of polyester polycarboxylic acids of aliphatic polyhydric alcohols and aliphatic polyhydric carboxylic acids; Dimers, oligomers or polymers obtained by vinyl polymerization of glycidyl acrylate or glycidyl methacrylate; Or oligomers or polymers obtained by vinyl polymerization of glycidyl acrylate or glycidyl me
- aliphatic polyhydric alcohol for example, an aliphatic polyhydric alcohol having 2 to 20 carbon atoms, 2 to 16 carbon atoms, 2 to 12 carbon atoms, 2 to 8 carbon atoms or 2 to 4 carbon atoms may be exemplified.
- Ethylene glycol 1,2-propanediol, 1,3-propanediol, 2-methyl-1,3-propanediol, 2-butyl-2-ethyl-1,3-propanediol, 1,4-butanediol, neo Pentyl glycol, 3-methyl-2,4-pentanediol, 2,4-pentanediol, 1,5-pentanediol, 3-methyl-1,5-pentanediol, 2-methyl-2,4-pentanediol, 2,4-diethyl-1,5-pentanediol, 1,6-hexanediol, 1,7-heptanediol, 3,5-heptanediol, 1,8-octanediol, 2-methyl-1,8- Aliphatic diols such as octanediol, 1,9-nonane
- alkylene oxide of 1 to 20 carbon atoms, 1 to 16 carbon atoms, 1 to 12 carbon atoms, 1 to 8 carbon atoms or 1 to 4 carbon atoms can be exemplified, for example, ethylene jade Seeds, propylene oxide or butylene oxide and the like can be used.
- aliphatic polyhydric carboxylic acid For example, oxalic acid, malonic acid, succinic acid, glutaric acid, adipic acid, pimelic acid, sumeric acid, azelaic acid, sebacic acid, dodecane diacid, 2-methyl succinic acid, 2-methyladipic acid, 3-methyladipic acid, 3-methylpentaneic acid, 2-methyloctanoic acid, 3,8-dimethyldecanediic acid, 3,7-dimethyldecanediic acid, 1,20-eicosamethylenedica Carboxylic acid, 1,2-cyclopentanedicarboxylic acid, 1,3-cyclopentanedicarboxylic acid, 1,2-cyclohexanedicarboxylic acid, 1,3-cyclohexanedicarboxylic acid, 1, 4-cyclohexanedicarboxylic acid, 1,4-dicarboxymethylenecyclohexane, 1,2,3-propylic acid, 1,
- the second epoxy compound of the present invention may include one or more glycidyl ether groups, for example, 1,4-cyclohexanedimethanol diglycidyl ether, 1,4-butanediol diggle Cydyl ether, 1,6-hexanediol diglycidyl ether, neopentyl diglycidyl ether, resorcinol diglycidyl ether, diethylene glycol diglycidyl ether, ethylene glycol diglycidyl ether, One selected from the group consisting of trimethylolpropanetriglycidyl ether, n-butyl glycidyl ether, 2-ethylhexyl glycidyl ether, phenyl glycidyl ether, and o-cresyl glycidyl ether The above can be used as the second epoxy compound of the present invention.
- the second epoxy compound has a glass transition temperature of about 0 ° C to 60 ° C of the homopolymer.
- the present invention is not limited thereto, but in the present invention, it is preferable to use a combination of the first epoxy compound including at least one epoxidized aliphatic ring group and the second epoxy compound including at least one glycidyl ether group as the epoxy compound. Particularly preferred.
- the thickness of the adhesive layer is preferably about 20 to 4,000nm.
- the said film laminated body is swollen.
- the swelling may be performed by, for example, immersing the film laminate in water at 15 ° C to 35 ° C.
- the swelling is performed so that the swelling degree of the polyvinyl alcohol-based film is 0.36 to 0.44.
- swelling degree means the value computed by following formula (1).
- the optical properties such as the degree of polarization are greatly affected by the degree of swelling, and in order to exhibit a degree of polarization of 99.9% or more, the degree of swelling is 0.36 to 0.44.
- the numerical range of must be satisfied.
- the swelling degree of the polyvinyl alcohol-based film can be adjusted by a method of controlling the swelling tank residence time. More specifically, in the present invention, the step of swelling the film laminate is preferably performed to satisfy the following formula (2) when the swelling tank residence time is t seconds.
- Equation (2) 0.36 ⁇ 0.105 ⁇ t 0.5 ⁇ 0.44
- the dyeing may be performed by immersing the film laminate in an aqueous solution containing iodine and / or dichroic dye.
- the concentration of iodine in the aqueous solution may be about 0.02% to 0.5% by weight, preferably, 0.05% to 0.3% by weight, but is not limited thereto.
- the temperature of the dyeing step may be about 20 °C to 50 °C, preferably, 25 °C to about 35 °C.
- the dyeing temperature When the dyeing temperature is out of the above numerical range, the degree of diffusion of iodine ions into the polyvinyl alcohol decreases, and the dyeing efficiency is lowered. When the temperature is too high, the iodine sublimation becomes large and the iodine loss increases. Meanwhile, the dyeing time may be about 30 seconds to about 90 seconds, but is not limited thereto.
- a crosslinking step of crosslinking the iodine and / or the dichroic dye to the polyvinyl alcohol-based film may be further performed, where the crosslinking step is, for example, a film
- the laminate may be performed by immersing the aqueous solution in boric acid.
- a process of cleaning the film laminate after the dyeing step may be further performed.
- the cleaning process is not limited thereto, but may be performed in an aqueous boric acid solution, and more specifically, in an aqueous boric acid solution having a boric acid concentration of about 0.1 to 2.5 wt%, preferably about 0.5 to 2.0 wt%. It is desirable to be.
- the said film laminated body is extended
- the stretching is preferably carried out so that the thickness of the polyvinyl alcohol-based film is less than 10 ⁇ m, for example, the thickness of the polyvinyl alcohol-based film is 1 ⁇ m to 10 ⁇ m, 3 ⁇ m to 10 ⁇ m or 1 ⁇ m It is preferable to carry out so that it becomes about 5 micrometers.
- the stretching conditions are not particularly limited, for example, the stretching may be carried out at a draw ratio of 5 times to 15 times at a temperature of 20 °C to 85 °C, more preferably 40 It may be carried out at a draw ratio of 5 to 12 times at a temperature of °C to 80 °C.
- the stretching may be performed by wet stretching or dry stretching.
- wet stretching since the surface adhesion of the thermoplastic polyurethane film and the polyvinyl alcohol-based film is stronger than the dry stretching, the stretching can be performed stably without a separate bonding means.
- the wet stretching is preferably carried out in an aqueous boric acid solution, wherein the boric acid concentration of the aqueous boric acid solution is preferably about 1.0 to 5.0 wt%.
- the stretching step at least one of the step of dyeing iodine and / or dichroic dye on the polyvinyl alcohol-based film and / or cross-linking the dyed iodine and / or dichroic dye to the polyvinyl alcohol-based film It may be performed together with the above steps.
- the dyeing, crosslinking and stretching processes can be performed simultaneously.
- the film laminate with the dyeing completed is immersed in an aqueous solution of boric acid, and stretched in an aqueous solution of boric acid.
- the crosslinking step and the stretching step may be performed together.
- the drying is preferably 20 °C to 100 °C, more preferably about 40 °C to 90 °C degree, it is preferably carried out for 1 minute to 10 minutes at the above temperature.
- the drying process prevents the PVA polarizer from deteriorating the physical properties of the PVA polarizer by water removal in the PVA surface and water by removing moisture from the PVA, and induces the width shrinkage of the polyvinyl alcohol film stretched during the drying process. It serves to improve the polarization degree of the polarizer by increasing the orientation of the complex composed of iodine.
- the step of separating the polymer film and the polyvinyl alcohol-based film of the stretched film laminate may be performed by applying a weak peel force to the polyvinyl alcohol-based film to be separated from the polymer film.
- the peel force is preferably 2N / 2cm or less, for example, may be about 0.1 to 2N / 2cm or 0.1 to 1N / 2cm.
- the peel force required to separate the polyvinyl alcohol-based film and the polymer film is very weak compared to the case of lamination using a coating or co-extrusion, the two films are easily separated without any other process or equipment. Not only that, but also the damage of the polyvinyl alcohol-based film in the separation process is very low, it shows very excellent optical performance.
- the polarizer of the present invention produced by the above method is very thin, the thickness of which is about 10 ⁇ m or less, preferably about 1 ⁇ m to 10 ⁇ m, more preferably about 3 ⁇ m to 10 ⁇ m.
- the unitary transmittance is about 40% to 45%, and the polarization degree is 99.9% or more, indicating very excellent optical properties.
- a polarizing plate can be formed by laminating a transparent film on one side or both sides on the polarizer of the present invention as described above.
- various films used in the art as a polarizer protective film or a retardation film may be used without limitation, for example, an acrylic film, a PET film, an acrylic primer treated PET film, a cellulose film , Cycloolefin-based film, polycarbonate-based film, polynorbornene-based film and the like can be used.
- the method of laminating the polarizer and the transparent film is not particularly limited, and may be performed using an adhesive or an adhesive well known in the art.
- the pressure-sensitive adhesive or adhesive may be appropriately selected in consideration of the material of the transparent film to be used, for example, when using a TAC as a transparent film, an aqueous adhesive such as a polyvinyl alcohol-based adhesive may be used, When using an acrylic film, a COP film, etc. as a transparent film, photocuring or thermosetting adhesives, such as an acrylic adhesive and an epoxy adhesive, can be used.
- a 20-micrometer-thick polyvinyl alcohol film (Japanese synthetic company, M2000 grade) was affixed on both sides of a 40-micrometer-thick polyurethane film, and the film laminated body was manufactured. Then, the film laminate was swelled for 15 seconds in a 25 ° C. pure solution, followed by a dyeing process for 60 seconds in a 0.3 wt% concentration and an iodine solution at 25 ° C. Then, the film laminate was washed in a 1 wt% solution of boric acid for 15 seconds, and then subjected to a 6-fold stretching process in a 2 wt% solution of boric acid at 50 ° C.
- a thin polarizer with a thickness of 5.8 ⁇ m was manufactured in the same manner as in Example, except that the swelling step was performed for 10 seconds.
- a thin polarizer with a thickness of 5.4 ⁇ m was produced in the same manner as in Example, except that the swelling step was performed for 20 seconds.
- a polarizer was produced in the same manner as in Example, except that the dyeing step was immediately performed except for the swelling step.
- Optical properties such as swelling ratio, single transmittance, polarization degree and single color, orthogonal color of the thin polarizers prepared in Examples and Comparative Examples 1 and 2 were measured with a JASCO V-7100 Spectrophotometer. The measurement results are shown in [Table 1].
- a 20-micrometer-thick polyvinyl alcohol film (Japanese synthetic company, M2000 grade) was affixed on both sides of a 40-micrometer-thick polyurethane film, and the film laminated body was manufactured. Then, the swelling degree was measured while changing the residence time in the 25 ° C pure solution in the film laminate, and the swelling degree of the polyvinyl alcohol-based film according to the swelling tank residence time was calculated. The result is shown in FIG. As shown in the graph of FIG. 2, it can be seen that when the swelling degree is x and the swelling tank residence time is t seconds, a relational expression such as the following formula (3) holds.
Abstract
Description
구분 | 팽윤도(%) | 단체 투과도(Ts, %) | 편광도(DOP, %) | 단체 색상 | 직교 색상 | ||
a | b | a | b | ||||
실시예 | 40.9 | 43.0 | 99.9172 | -0.79 | 2.12 | 0.52 | -3.05 |
비교예 1 | 35.8 | 43.0 | 99.8814 | -0.85 | 2.09 | 0.54 | -3.28 |
비교예 2 | 46.2 | 43.0 | 99.7842 | -0.88 | 1.87 | 0.45 | -3.88 |
비교예 3 | × | 연신 공정 중 파단 발생 |
Claims (10)
- 고분자 필름의 적어도 일면에 인력 또는 접착제를 이용하여 폴리비닐알코올계 필름을 부착하여 필름 적층체를 형성하는 단계;상기 폴리비닐알코올계 필름의 팽윤도가 0.36 내지 0.44가 되도록 상기 필름 적층체를 팽윤시키는 단계;상기 필름 적층체에 요오드 및 이색성 염료 중 적어도 하나를 염착시키는 단계; 및상기 필름 적층체를 연신하는 단계를 포함하는 박형 편광자의 제조 방법.
- 제1항에 있어서,상기 필름 적층체를 팽윤시키는 단계는, 팽윤조 체류 시간을 t초라 할 때, 하기 식(2)를 만족하도록 수행되는 것인 박형 편광자의 제조 방법.식 (2) : 0.36≤0.105·t0.5 ≤0.44
- 제1항에 있어서,상기 폴리비닐알코올계 필름은 두께가 10㎛ 내지 60㎛인 박형 편광자의 제조 방법.
- 제1항에 있어서,상기 연신하는 단계는 5배 내지 15배의 연신 배율로 수행되는 것인 박형 편광자의 제조 방법.
- 제1항에 있어서,상기 연신하는 단계는 45℃ 내지 55℃의 온도에서 수행되는 것인 박형 편광자의 제조 방법.
- 제1항에 있어서,상기 연신하는 단계는 붕산 농도가 1 내지 5%인 붕산 수용액에서 수행되는 것인 박형 편광자의 제조 방법.
- 제1항에 있어서,상기 연신하는 단계 이후에 상기 고분자 필름과 폴리비닐알코올계 필름을 분리하는 단계를 더 포함하는 박형 편광자의 제조 방법.
- 제1항에 있어서,상기 연신하는 단계 이후에 연신된 필름 적층체를 건조하는 단계를 더 포함하는 박형 편광자의 제조 방법.
- 청구항 1 내지 8 중 어느 한 항의 제조 방법에 의해 제조되고,두께가 10㎛ 이하이고,단체 투과도가 40% 내지 45%이며,편광도가 99.9% 이상인 폴리비닐알코올계 박형 편광자.
- 청구항 9의 폴리비닐알코올계 박형 편광자를 포함하는 편광판.
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
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CN201480071315.3A CN105849602B (zh) | 2013-12-27 | 2014-09-23 | 薄偏光片,其制造方法,以及包含该偏光片的偏光板 |
US15/107,283 US9915766B2 (en) | 2013-12-27 | 2014-09-23 | Thin polarizer with excellent optical properties, manufacturing method therefor and polarizing plate including same |
JP2016542704A JP6266789B2 (ja) | 2013-12-27 | 2014-09-23 | 光学物性に優れた薄型偏光子、その製造方法およびこれを含む偏光板 |
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JP2012118521A (ja) * | 2010-11-10 | 2012-06-21 | Sumitomo Chemical Co Ltd | 偏光性積層フィルムおよび偏光板の製造方法 |
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