WO2015047005A1 - Composition de résine pour film optique, film optique formé à partir de cette composition, et plaque de polarisation et dispositif d'affichage d'image la comprenant - Google Patents

Composition de résine pour film optique, film optique formé à partir de cette composition, et plaque de polarisation et dispositif d'affichage d'image la comprenant Download PDF

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Publication number
WO2015047005A1
WO2015047005A1 PCT/KR2014/009137 KR2014009137W WO2015047005A1 WO 2015047005 A1 WO2015047005 A1 WO 2015047005A1 KR 2014009137 W KR2014009137 W KR 2014009137W WO 2015047005 A1 WO2015047005 A1 WO 2015047005A1
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WIPO (PCT)
Prior art keywords
resin composition
optical film
monomer
film
methacrylate
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Ceased
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PCT/KR2014/009137
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English (en)
Korean (ko)
Inventor
엄준근
박성일
전성장
이남정
박세정
박태성
김철호
전은진
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LG Chem Ltd
LX MMA Co Ltd
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LG Chem Ltd
LG MMA Corp
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Filing date
Publication date
Priority claimed from KR1020140123606A external-priority patent/KR101914815B1/ko
Application filed by LG Chem Ltd, LG MMA Corp filed Critical LG Chem Ltd
Priority to JP2016545704A priority Critical patent/JP6389261B2/ja
Priority to US15/024,719 priority patent/US20160245970A1/en
Priority to EP14848370.4A priority patent/EP3054322B1/fr
Priority to CN201480054157.0A priority patent/CN105683783A/zh
Publication of WO2015047005A1 publication Critical patent/WO2015047005A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
    • G02B1/04—Optical elements characterised by the material of which they are made; Optical coatings for optical elements made of organic materials, e.g. plastics

Definitions

  • the present invention relates to a resin composition and an optical film formed using the same, and more particularly, to a copolymer formed by polymerizing an alkyl methacrylate monomer, a styrene monomer, a phenylmaleimide monomer and an alkyl acrylate monomer. It relates to a resin composition for an optical film, an optical film formed by using the same, a polarizing plate and an image display device comprising the same.
  • the most widely used polymer film for display is a triacetyl cellulose film (TAC), which is used as a polarizer protective film, and the TAC film has a low polarization degree when used for a long time in a high temperature or high humidity atmosphere.
  • TAC triacetyl cellulose film
  • polymer films based on acrylic or polycarbonate such as polystyrene, methyl methacrylate, have been proposed.
  • acrylic or polycarbonate such as polystyrene, methyl methacrylate
  • These polymer films have an advantage of excellent heat resistance, but polystyrene or polycarbonate films have an aromatic ring in the polymer, so that birefringence occurs during orientation, which adversely affects optical properties.
  • the phase difference value is relatively smaller than that of polystyrene or polycarbonate, but it is not sufficient to be applied to an optical material such as a liquid crystal device requiring high precision.
  • a method of copolymerizing or blending a monomer or a polymer with a material for polymer film having excellent heat resistance and low retardation value has been proposed.
  • a method of using a maleimide monomer in order to obtain a resin composition having excellent heat resistance has been proposed, and in practice, the frequency of using cyclohexyl maleimide is increasing.
  • copolymers of methyl methacrylate, cyclomaleimide and alpha methyl styrene have been mainly used as heat resistant resins.
  • the cyclohexyl maleimide is an environmentally regulated material, and in particular, the cyclohexyl maleimide remaining in the resin when the resin composition is extruded into the film generates an irritating and harmful odor, resulting in a decrease in production efficiency and a process. There was a problem of instability.
  • the present invention is to solve the problems as described above, to suppress the odor generated during the extrusion of the conventional resin composition, the resin composition for an optical film with improved thermal stability, and an optical film prepared using the same, a polarizing plate and the same An image display device is provided.
  • the present invention provides a resin composition for an optical film comprising a copolymer formed by polymerizing an alkyl methacrylate monomer, a styrene monomer, a phenylmaleimide monomer and an alkyl acrylate monomer.
  • the content of the unreacted phenylmaleimide monomer remaining in the resin composition is preferably 30 ppm or less with respect to the whole composition.
  • the resin composition may further include a polycarbonate.
  • the copolymer is 70 to 98 parts by weight of the alkyl methacrylate monomer, 0.1 to 10 parts by weight of the styrene monomer, 1 to 15 parts by weight of the phenylmaleimide monomer based on 100 parts by weight of the copolymer; And 0.1 to 5 parts by weight of alkyl acrylate monomers.
  • the weight ratio of the phenylmaleimide monomer and the alkyl acrylate monomer is preferably 2: 1 to 7: 1.
  • the resin composition for optical films has a glass transition temperature of 100 to 150 degreeC, and the 2% weight loss temperature measured by the thermogravimetric analyzer (TGA) is 280 degreeC or more.
  • the present invention provides an optical film comprising the resin composition for an optical film.
  • the present invention provides a polarizing plate including the optical film and an image display device including the same.
  • the resin composition according to the present invention can reduce the odor generated during the film extrusion, excellent thermal stability can improve the production efficiency, can provide a film excellent in heat resistance and optical properties. Therefore, the optical film formed using the resin composition of the present invention can be used for display devices of various uses.
  • a resin composition for an optical film comprising a copolymer formed by polymerizing an alkyl methacrylate monomer, a styrene monomer, a phenylmaleimide monomer and an alkyl acrylate monomer.
  • the copolymer means that the elements mentioned as monomers in the present specification are polymerized and included as repeating units in the copolymer resin.
  • the copolymer may be a block copolymer or a random copolymer.
  • the copolymer is a quaternary copolymer made of a resin composition for an optical film comprising a copolymer formed by polymerizing the above alkyl methacrylate monomer, styrene monomer, phenylmaleimide monomer and alkyl acrylate monomer.
  • the present invention is not limited thereto and may further include other monomers as comonomers in addition to the above-mentioned monomers within a range not departing from the object of the present invention.
  • an optical film can be manufactured by adjusting the composition and the extending
  • the alkyl methacrylate monomer is for imparting high transparency optical properties to the resin composition or film.
  • the alkyl moiety of the alkyl methacrylate monomer may be a substituted or unsubstituted alkyl group or a cycloalkyl group, wherein the alkyl moiety preferably has 1 to 10 carbon atoms, more preferably 1 to 6 carbon atoms. It is most preferable that they are a methyl group or an ethyl group.
  • methyl methacrylate, ethyl methacrylate, isopropyl methacrylate, n-butyl methacrylate, t-butyl methacrylate, hydroxyethyl methacrylate, isobornyl methacrylate and cyclohexyl methacrylate At least one selected from the group consisting of, but is not limited thereto.
  • the content of the alkyl methacrylate monomer is about 70 to 98 parts by weight, and more preferably about 82 to 97 parts by weight based on 100 parts by weight of the copolymer.
  • the content satisfies the above range, a film having excellent optical properties may be obtained, and the birefringence generated during stretching may be minimized.
  • the styrene monomer can improve the polymerization efficiency between each monomer, it can be expected to reduce the residual monomer contained in the copolymer produced.
  • the film produced by the resin composition containing the styrene monomer can more easily control the stretching retardation can provide a zero retardation film having excellent birefringence.
  • the styrene monomer may be an unsubstituted styrene monomer or a substituted styrene monomer.
  • the substituted styrene monomer may be styrene substituted with a substituent containing an aliphatic hydrocarbon or hetero atom in a benzene ring or vinyl group.
  • styrene substituted with C 1-4 alkyl or halogen can be used. More specifically, the styrene monomer may be used at least one selected from the group consisting of styrene, ⁇ -methyl styrene, p-bromo styrene, p-methyl styrene and p-chloro styrene, most preferably styrene, ⁇ -methylstyrene and p-methyl styrene.
  • the content of the styrene monomer is preferably about 0.1 to 10 parts by weight, and more preferably about 0.5 to 5 parts by weight based on 100 parts by weight of the copolymer.
  • the content of the styrene-based monomer satisfies the above range, the effect of reducing the residual monomer and the glass transition temperature of the copolymer can be obtained, and the stretching retardation of the film is easily controlled, which is more preferable in terms of optical properties of the film. This is because the effect can be obtained.
  • the said phenyl maleimide type monomer is for improving the thermal stability and heat resistance of a resin composition and a film, and improving compounding compatibility with a polycarbonate resin.
  • the said phenyl maleimide type monomer is for improving the thermal stability and heat resistance of a resin composition and a film, and improving compounding compatibility with a polycarbonate resin.
  • the maleimide-based residual monomer generates an irritating odor during processing, and may be easily solidified to cause appearance defects in optical film production.
  • the phenyl maleide monomer has a constant chemical structure due to the substitution of a phenyl group, and thus it is easy to form a copolymer with an alkyl methacrylate monomer and a styrene monomer, and is heat resistant. It can be improved, and the polymerization time is relatively short advantage.
  • the amount of phenylmaleimide-based monomer remaining in the resin after copolymer formation is much lower than that of the cyclohexylmaleimide-based resin, and it is possible to reduce the occurrence of odor during processing caused by the residual monomer.
  • phenyl maleimide monomer is selected from the group consisting of phenyl maleimide, nitrophenyl maleimide, monochlorophenyl maleimide, dichlorophenyl maleimide, monomethylphenyl maleimide, dimethylphenyl maleimide, and ethylmethylphenyl maleimide It is preferable that it is at least one.
  • the content of the phenylmaleimide-based monomer is preferably about 1 to 15 parts by weight, more preferably about 2 to 10 parts by weight based on 100 parts by weight of the copolymer.
  • the content of the phenylmaleimide monomer satisfies the above range, the heat resistance of the resin composition or the film is strengthened, mixed well with the polycarbonate resin, and the film can be formed without precipitation.
  • the said alkylacrylate type monomer is for providing the resin composition with the polymerization stability, thermal stability, and toughness to the stretched film.
  • the alkyl moiety of the alkyl acrylate monomer may be a substituted or unsubstituted alkyl group or a cycloalkyl group, wherein the alkyl moiety preferably has 1 to 10 carbon atoms, more preferably 1 to 6 carbon atoms, Most preferably, it is a methyl group or an ethyl group. Specifically, it may be methyl acrylate, ethyl acrylate, isopropyl acrylate n-butyl acrylate, t-butyl acrylate, cyclohexyl acrylate, isobornyl acrylate, hydroxymethyl acrylate or hydroxyethyl acrylate. It is not limited to this.
  • the content of the alkyl acrylate monomer is about 0.1 to 5 parts by weight based on 100 parts by weight of the copolymer, more preferably about 0.5 to 3.0 parts by weight.
  • the content satisfies the above range, it is easy to polymerize between the alkyl methacrylate monomer and the phenylmaleimide monomer at the time of copolymer formation, thereby reducing the residues of phenylmaleimide in the resin composition. It is possible to overcome the thermal decomposition phenomenon by the phenyl maleimide, there is an effect that the stretching process is easily carried out by giving toughness when stretching the film.
  • the weight ratio of the phenylmaleimide monomer and the alkyl acrylate monomer is preferably about 2: 1 to 10: 1, more preferably about 2: 1 to 7: 1.
  • the weight ratio of the two monomers satisfies the above range, the residual monomer of the copolymer can be reduced, and the retention stability in the extruder and the polymer filter during film processing can be improved.
  • the resin composition of this invention it is preferable that content of the unreacted phenylmaleimide-type monomer which remains in a resin composition is 30 ppm or less with respect to the whole composition, and it is more preferable that it is 20 ppm or less.
  • the inventors of the present invention found that the cyclohexylmaleimide monomer mainly used as a monomer of the copolymer constituting the heat resistant resin has a relatively low degree of polymerization due to the high rotational properties of the cyclohexyl group.
  • the cyclohexylmaleimide monomer generates an irritating and harmful odor, thereby causing a process problem.
  • the phenylmaleimide monomer has an excellent degree of polymerization compared to the cyclohexyl maleimide monomer due to the stable aromatic ring, the amount of monomer remaining in the copolymer is very small, there is an advantage to improve the stability of the process.
  • Another aspect of the present invention relates to a resin composition
  • a resin composition comprising the copolymer and a polycarbonate.
  • the polycarbonate is added to adjust the phase difference is contained in an amount of about 0.1 to 10 parts by weight based on 100 parts by weight of the total resin composition, it is preferably included in about 1 to 5 parts by weight.
  • the polycarbonate is contained in a smaller amount than this, there is a problem in that the thickness direction retardation of the stretched film is increased in a positive direction.
  • the amount is exceeded, the thickness direction retardation of the stretched film is increased in a negative direction.
  • compatibility with an acrylic resin composition falls and there exists a problem that a whitening phenomenon generate
  • the absolute value of the plane direction phase difference R in defined by the following [Equation 1] and the absolute value of the thickness direction phase difference R th defined by the following [Equation 2] are 5 nm, respectively.
  • it can be added to adjust the content to 3nm, more preferably 0.
  • n x is the largest refractive index of the in-plane refractive index of the optical film
  • n y is the refractive index of the direction perpendicular to n x of the in-plane refractive index of the optical film
  • n z is the refractive index in the thickness direction
  • d is the thickness of the film.
  • the resin composition of the present invention containing an acrylic copolymer resin and a polycarbonate resin for example, can be prepared using a method well known in the art, such as compounding method.
  • the resin composition may further include various additives generally used in the art, for example, lubricants, antioxidants, UV stabilizers, thermal stabilizers, and the like, as necessary.
  • the additives may be included in an appropriate amount within a range that does not impair the physical properties of the resin composition, for example, may be included in about 0.1 to 5 parts by weight based on 100 parts by weight of the total resin composition.
  • the glass transition temperature of the resin composition according to the present invention is preferably about 100 ° C to 150 ° C, more preferably 105 ° C to 140 ° C, and most preferably 110 ° C to 130 ° C. If the glass transition temperature is less than 100 °C, the heat resistance is insufficient to easily deform the film under high temperature and high humidity conditions, thereby causing a problem of deformation of the polarizing plate to cause non-uniformity of the liquid crystal panel. If the glass transition temperature is more than 150 °C resin processing properties are very low, there is a problem that the productivity is reduced due to the difficulty in forming the film due to the high viscosity during the joint processing.
  • the resin composition which concerns on this invention is excellent in thermal stability.
  • the zipper decomposition peculiar to resin containing alkyl methacrylate occurs. It is known that the terminal double bond proceeds as a starting point.
  • the present invention can reduce the molding defect by suppressing thermal decomposition at around 260 ° C., and can realize the production of a stable optical article without deteriorating the color tone.
  • thermal stability was evaluated using a thermogravimetric analyzer (TGA).
  • the temperature at which 2% weight of the resin was reduced was measured in the process of raising the temperature from 30 ° C to 500 ° C at a rate of 10 ° C / min, and the temperature was compared to evaluate the thermal stability.
  • the 2% weight loss temperature is preferably at least 280 ° C, more preferably at least 300 ° C, most preferably at least 320 ° C.
  • the present invention relates to an optical film comprising the resin composition of the present invention.
  • the optical film according to the present invention may be prepared, including forming a film, and may further include uniaxially or biaxially stretching the film.
  • any method known in the art may be used, for example, a solution caster method or an extrusion method, and an example may be a melt extrusion method.
  • the resin composition is dried in vacuo to remove moisture and dissolved oxygen, and then fed from a raw material hopper to a single or twin extruder substituted with nitrogen, and melted at a high temperature to obtain raw material pellets.
  • the raw material hopper to the extruder is melted with a nitrogen extruded single extruder, and then passed through a coat hanger type T-die to produce a film via a chrome plated casting roll, a drying roll, or the like.
  • film forming temperature becomes like this.
  • a T-die is attached to the front-end
  • simultaneous biaxial stretching, sequential biaxial stretching, etc. can also be performed by extending
  • stretching temperature is a range near the glass transition temperature of the resin composition which is a film raw material, Preferably it is (glass transition temperature -30 degreeC)-(glass transition temperature +100 degreeC) More preferably, it exists in the range of (glass transition temperature -20 degreeC)-(glass transition temperature +80 degreeC). If the stretching temperature is less than (glass transition temperature -30 ° C), there is a fear that a sufficient stretching ratio may not be obtained. On the contrary, when extending
  • the draw ratio defined by the area ratio is preferably 1.1 to 25 times, more preferably 1.3 to 10 times. If the draw ratio is less than 1.1 times, there is a fear that it does not lead to the improvement of the toughness accompanying stretching. When a draw ratio exceeds 25 times, there exists a possibility that the effect by raising a draw ratio may not be recognized.
  • the stretching speed is preferably 10 to 20,000% / min, more preferably 100 to 10.000% / min in one direction. If the stretching speed is less than 10% / min, it takes a long time to obtain a sufficient draw ratio, there is a fear that the manufacturing cost increases. When the stretching speed exceeds 20,000 & / min, there is a fear that breaking of the stretched film occurs.
  • the optical film may be subjected to heat treatment (annealing) or the like after the stretching treatment in order to stabilize its optical isotropy and mechanical properties.
  • the heat treatment conditions are not particularly limited and may employ any suitable conditions known in the art.
  • the optical film formed by using the resin composition of the present invention preferably has a thickness of 5 ⁇ m to 200 ⁇ m, but is not limited thereto.
  • the optical film manufactured by the resin composition of the present invention has a thermal expansion coefficient of 50 to 100 ppm / ° C, preferably 50 to 80 ppm / ° C, and a thermal expansion coefficient of PVA polarizing film as compared to conventional optical films.
  • the difference of is so small that the polarizing plate dimension change can be effectively suppressed at the time of polarizing plate application.
  • the optical transmittance of the optical film is 90% or more
  • haze (haze) characteristics may be in the range of 0.6% or less, preferably 0.3% or less. It is because it is suitable to be used as a polarizing plate protective film when a transmittance and a haze exist in the said range.
  • the absolute value of the surface direction phase difference represented by the following [formula 1] at a wavelength of 550 nm and the thickness direction represented by the above [formula 2] The absolute value of the retardation is about 5 nm, preferably about 3 nm, respectively, so that it can be very usefully used as a protective film for polarizing plates.
  • n x is the largest refractive index among the in-plane refractive indexes of an optical film
  • n y is the refractive index of the direction perpendicular to n x among the in-plane refractive indexes of an optical film
  • n z is a refractive index in the thickness direction
  • d is the thickness of the film.
  • the last aspect of the present invention relates to a polarizing plate including the optical film of the present invention and an image display device including the polarizing plate, and more specifically look as follows.
  • the polarizing plate means a state including a polarizer and a protective film, and as the polarizer, a film made of polyvinyl alcohol (PVA) containing iodine or dichroic dye may be used.
  • PVA polyvinyl alcohol
  • the polarizer may be prepared by dyeing iodine or dichroic dye on the PVA film, but a method of manufacturing the same is not particularly limited.
  • the protective film according to the present invention may be provided on both sides of the polarizer, or may be provided only on one surface.
  • a polarizer protective film well known in the art for example, TAC film, PET film, COP film, PC film, norbornene-based film, etc. Among them, in consideration of economics and the like, TAC film is particularly preferred.
  • the protective film and the polarizer may be bonded by a method known in the art.
  • it may be made by an adhesive method using an adhesive. That is, first, an adhesive is coated on the surface of a PVA film which is a protective film or a polarizer (polarizing film) by using a roll coater, gravure coater, bar coater, knife coater or capillary coater. Before the adhesive is completely dried, the protective film and the polarizer are bonded by heating or pressing at room temperature with a paper roll. In the case of using a hot melt adhesive, a heat press roll should be used.
  • Adhesives that can be used when the protective film and the polarizer are laminated include, but are not limited to, PVA adhesive, polyurethane adhesive, epoxy adhesive, styrene butadiene rubber (SBR) adhesive or hot melt adhesive.
  • PVA adhesive polyurethane adhesive
  • SBR styrene butadiene rubber
  • hot melt adhesive it is preferable to use the polyurethane adhesive manufactured using the aliphatic isocyanate type compound which does not yellow by light.
  • the polarizing plate of the present invention preferably further has an adhesive layer in order to facilitate lamination to a liquid crystal cell or the like, and may be disposed on one side or both sides of the polarizing plate.
  • the adhesive may be sufficiently cured by heat or ultraviolet rays after adhesion, and thus the mechanical strength may be improved to an adhesive level.
  • the adhesive strength is also large, so that the adhesive does not peel off without breakage of either film to which the adhesive is attached. It is desirable to have.
  • the adhesive which can be used is excellent in optical transparency, and it is preferable to show the adhesive characteristic of moderate wettability, cohesion, or adhesiveness.
  • the adhesive etc. which suitably prepared polymers, such as an acryl-type polymer, a silicone type polymer, polyester, a polyurethane, a polyether, synthetic rubber, as a base polymer, are mentioned.
  • the polarizing plate manufactured using the resin composition of this invention it has the characteristic that curl generation is few.
  • the curl means the center of the test piece and the edge of the test piece caused by the incorrectness generated when the polarizing plate test piece is placed on the horizontal table at a temperature of 24 ° C. and 50% RH with the concave surface facing up. Says the height of the car. The more curls are generated, there is a problem in that external air flows into the polarizer curl portion when the polarizer and the liquid crystal panel are attached to each other using the pressure-sensitive adhesive, thereby degrading the appearance quality of the liquid crystal panel.
  • the present invention provides an image display device including the polarizing plate, more preferably may be a liquid crystal display device.
  • the liquid crystal display according to the present invention is a liquid crystal display including a liquid crystal cell and a first polarizing plate and a second polarizing plate respectively provided on both surfaces of the liquid crystal cell, wherein at least one of the first polarizing plate and the second polarizing plate is It is characterized in that the polarizing plate according to the present invention. That is, one or two or more optical films according to the present invention are provided between the first polarizing plate and the liquid crystal cell, between the second polarizing plate and the liquid crystal cell, or between the first polarizing plate and the liquid crystal cell and between the second polarizing plate and the liquid crystal cell. It may be provided. It is preferable that the optical film or polarizer protective film provided in the opposite side to the liquid crystal cell of the said polarizing plate contains a UV absorber.
  • Methyl methacrylate, alpha methyl styrene, phenylmaleimide and methyl acrylate were prepared in 1000 g of the monomer mixture in the amounts shown in [Table 1], and 2000 g of distilled water and 8.4 g of a 5% polyvinyl alcohol solution in a 5 liter reactor (POVAL).
  • PVA217, Kuraray Co. 0.1 g of boric acid, 2.5 g of normal octyl mercaptan and 1.5 g of 2,2'-azobis isobutyronitrile were mixed and dispersed in an aqueous phase with stirring at 400 rpm to prepare a suspension.
  • the suspension was heated to 80 ° C. to carry out a polymerization reaction for 90 minutes. Then, the suspension was cooled to 30 ° C., washed with distilled water, dehydrated, and dried to obtain a resin composition.
  • the resin composition obtained as described above was subjected to polycarbonate (LUPOY 1080DVD, LG Chemicals) and antioxidant (AO60, Adeka) at a temperature of 265 ° C. under a nitrogen atmosphere using a twin screw extruder (diameter 30, L / D 40). Kneading was carried out under temperature conditions to prepare a resin pellet.
  • the composition, weight average molecular weight, glass transition temperature, haze, light transmittance and weight change rate of the prepared resin were measured, and the residual maleimide content, which is considered to be a major cause of odor generated during film processing, was further measured.
  • the measurement results are shown in Table 1.
  • the resin was prepared into a 160 ⁇ m film using a T-die extruder, and biaxially stretched at a rate of 2.0 times 200 mm / min in the MD direction and 2.0 times in the TD direction at a glass transition temperature of + 10 ° C. of the film.
  • 40 ⁇ m thick optical film was prepared.
  • the odor generated during the optical film manufacturing process was sensed and compared.
  • the residual phase difference, tensile strength, and coefficient of thermal expansion of the prepared optical film were measured. The measurement results are shown in Table 1.
  • a resin composition was prepared in the same manner as in Example 1, except that methyl methacrylate, alpha methyl styrene, phenylmaleimide, and methyl acrylate were mixed in the amounts shown in Table 1 below, and together with the physical property measurement results, It was.
  • a resin composition was prepared in the same manner as in Example 1, except that methyl methacrylate, alpha methyl styrene, and phenylmaleimide were mixed in the amounts shown in Table 1 below, and the physical property measurement results are also shown.
  • the resin composition was prepared in the same manner as in Example 1, and the physical property measurement results are shown together.
  • a resin composition was prepared in the same manner as in Example 1, except that methyl methacrylate, alphamethylstyrene, and cyclohexyl maleimide were mixed in the amounts shown in Table 1 below, and the measurement results of the physical properties were also shown.
  • a resin composition was prepared in the same manner as in Example 1, except that methyl methacrylate, alpha methyl styrene, cyclohexyl maleimide, and methyl acrylate were mixed in the amounts shown in Table 1 below. Shown.
  • a polarizing plate As follows, the film is placed on one surface of a 25 ⁇ m thick PVA polarizer, and a 60 ⁇ m thick TAC film (Fuji, UZ TAC) is placed on the other side, and then a modified PVA-based aqueous adhesive is injected therebetween, followed by a compression roll. After hot air drying at a temperature of 80 ° C. for 5 minutes, a polarizer semi-finished product was prepared.
  • a polyester film having a release layer coated with a 20 ⁇ m thick adhesive was laminated using a roll laminator.
  • a polyester-based protective film having an adhesive layer was laminated to prepare a finished polarizing plate.
  • the physical properties of the polarizing plate thus prepared were measured by the method described below, and the single transmittance, orthogonal transmittance, and polarization degree of the polarizing plate in the semi-finished state, and the Curl of the polarizing plate in the finished state. The measurement results are shown in [Table 1].
  • the physical property evaluation method is as follows.
  • Glass transition temperature (Tg) Measured under 10 °C / min temperature conditions using a differential scanning calorimeter (DSC) DSC823 from Mettler Toledo.
  • Weight change rate It was set in the TGA (heat balance) measuring apparatus, it measured under the nitrogen stream, and heated up from 30 degreeC to 500 degreeC at the temperature increase rate of 10 degree-C / min, and measured the temperature which a 2% weight reduction generate
  • the maleimide monomer remaining in the resin after polymerization was quantitatively measured by a gas chromatograph (GC) analyzer. More specifically, first, the prepared resin pellet is completely dissolved in a certain amount of organic solvent (chloroform), and then n-hexane solvent is added to precipitate the dissolved resin component. After taking the upper part of the solution thus obtained, GC analysis is performed, and the residual maleimide component remaining in the resin is measured in comparison with the GC analysis result of the copolymer monomer measured in advance. At this time, the maleimide monomer remaining in the resin is the main cause of the odor generated during processing.
  • GC gas chromatograph
  • Retardation The retardation of the prepared film was measured using a birefringence measuring instrument (Axoscan, Axometrics), the measurement wavelength was carried out at 550nm.
  • Haze and light transmittance It measured according to ASTM1003 method.
  • CTE Thermal expansion coefficient
  • Polarizing plate optical properties The polarization degree of the polarizing plate was confirmed by measuring the single transmittance (Ts) and the orthogonal transmittance (Tc) of the polarizing plate using a P-2000 (JASCO) measuring instrument which is a digital spectro polarimeter.
  • the polarization degree is defined by the following [Equation 3] by the parallel transmittance (Tp) obtained when the two polarizing plates are arranged in parallel with the absorption axis and the orthogonal transmission (Tc) obtained after orthogonal to each other so that the absorption axis is 90 °. .
  • Tp parallel transmittance
  • Tc orthogonal transmission
  • a single transmittance value may be used instead of parallel transmittance.
  • Curl measurement A polarizer specimen cut to 200 mm x 200 mm is placed on a horizontal table at 24 ° C and 50% RH with the concave side facing up for 1 hour, and the four corners of the specimen lifted from the table. was measured using a ruler and the maximum value was defined as the amount of curl.

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  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
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Abstract

La présente invention concerne une composition de résine et un film optique formé à partir de cette composition. Plus précisément, l'invention concerne une composition de résine copolymère formée par la polymérisation d'un monomère à base d'un méthacrylate d'alkyle, d'un monomère à base de styrène, d'un monomère à base de phénylmaléimide et d'un monomère à base d'un acrylate d'alkyle, ainsi qu'un film optique formé à partir de cette composition. La composition de résine selon la présente invention permet de réduire l'odeur âcre créée au moment de l'extrusion du film, et est excellente en termes de résistance thermique et de stabilité thermique.
PCT/KR2014/009137 2013-09-30 2014-09-29 Composition de résine pour film optique, film optique formé à partir de cette composition, et plaque de polarisation et dispositif d'affichage d'image la comprenant Ceased WO2015047005A1 (fr)

Priority Applications (4)

Application Number Priority Date Filing Date Title
JP2016545704A JP6389261B2 (ja) 2013-09-30 2014-09-29 光学フィルム用樹脂組成物、これを用いて形成された光学フィルム、これを含む偏光板及び画像表示装置
US15/024,719 US20160245970A1 (en) 2013-09-30 2014-09-29 Resin composition for optical film, optical film formed using same, and polarizing plate and image display device comprising same
EP14848370.4A EP3054322B1 (fr) 2013-09-30 2014-09-29 Composition de résine pour film optique, film optique formé à partir de cette composition, et plaque de polarisation et dispositif d'affichage d'image la comprenant
CN201480054157.0A CN105683783A (zh) 2013-09-30 2014-09-29 用于光学膜的树脂组合物、使用其形成的光学膜和包括该光学膜的偏光板和图像显示装置

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KR1020140123606A KR101914815B1 (ko) 2013-09-30 2014-09-17 광학 필름용 수지 조성물, 이를 이용하여 형성된 광학 필름, 이를 포함하는 편광판 및 화상 표시 장치

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US10633530B2 (en) 2016-08-09 2020-04-28 Lg Chem, Ltd. Resin composition for optical material and optical film comprising the same
US10816712B2 (en) 2016-06-22 2020-10-27 Lg Chem, Ltd. Optical film and polarization plate comprising the same

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US4826937A (en) * 1986-02-03 1989-05-02 Arco Chemical Technology, Inc. Thermoplastic interpolymers of methyl methacrylate, N-substituted maleimides, and alkyl acrylates
JP3648271B2 (ja) * 1993-08-19 2005-05-18 ローム アンド ハース カンパニー 改良されたポリカーボネートブレンド
WO2009112425A1 (fr) * 2008-03-12 2009-09-17 Basf Se Film optique pour écran plat
US20100296031A1 (en) * 2008-01-03 2010-11-25 Nam-Jeong Lee Optical film, protection film for polarizer, polarizing plate fabricated therefrom, and display device employing thereof
JP2012082358A (ja) * 2010-10-14 2012-04-26 Kaneka Corp 光学用フィルム

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US4826937A (en) * 1986-02-03 1989-05-02 Arco Chemical Technology, Inc. Thermoplastic interpolymers of methyl methacrylate, N-substituted maleimides, and alkyl acrylates
JP3648271B2 (ja) * 1993-08-19 2005-05-18 ローム アンド ハース カンパニー 改良されたポリカーボネートブレンド
US20100296031A1 (en) * 2008-01-03 2010-11-25 Nam-Jeong Lee Optical film, protection film for polarizer, polarizing plate fabricated therefrom, and display device employing thereof
WO2009112425A1 (fr) * 2008-03-12 2009-09-17 Basf Se Film optique pour écran plat
JP2012082358A (ja) * 2010-10-14 2012-04-26 Kaneka Corp 光学用フィルム

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10816712B2 (en) 2016-06-22 2020-10-27 Lg Chem, Ltd. Optical film and polarization plate comprising the same
US10633530B2 (en) 2016-08-09 2020-04-28 Lg Chem, Ltd. Resin composition for optical material and optical film comprising the same

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