KR20100025741A - Resin composition for optical film and optical film comprising the same - Google Patents

Abstract

PURPOSE: An optical film is provided to ensure excellent in-plane phase difference, thickness direction phase difference, optical transparency, heat resistance and toughness, and to reduce production costs of a film. CONSTITUTION: A resin composition for an optical film comprises (a) a polyacrylate-based resin including a compound represented by chemical formula 1, (b) a polyester-based resin including a compound represented by chemical formula 2, and (c) a copolymer resin including an aromatic vinyl monomer and an acid anhydride monomer.

Description

RESIN COMPOSITION FOR OPTICAL FILM AND OPTICAL FILM COMPRISING THE SAME}

The present invention relates to a resin composition for an optical film, and an optical film comprising the same.

Recently, display technologies using various methods such as plasma display panel (PDP) and liquid crystal display (LCD), which replace conventional CRTs, have been proposed and marketed based on the development of optical technology. Polymer materials for such displays are becoming more sophisticated. For example, in the case of liquid crystal displays, as thin film thickness, light weight, and large screen area are promoted, wide viewing angles, high contrast, suppression of image color tone change according to viewing angle, and uniformity of screen display have become particularly important problems.

Accordingly, various polymer films are used for polarizing films, retardation films, plastic substrates, light guide plates, and the like, and liquid crystals include twisted nematic (TN), super twisted nematic (STN), and VA (vertical alignment). ), Various types of liquid crystal display devices using IPS (in-plane switching) liquid crystal cells have been developed. All of these liquid crystal cells have an inherent liquid crystal array, have inherent optical anisotropy, and in order to compensate for this optical anisotropy, films have been proposed in which various kinds of polymers are drawn to give a retardation function.

For example, Japanese Unexamined Patent Application Publication No. 9-304619 is mentioned as an example using polycarbonate (PC) resin. However, when extending | stretching polycarbonate resin in this way, although sufficient retardation function can be provided as a retardation film, there exists a problem that it is difficult to manufacture the film which has a large retardation change rate according to extension degree, and has a more uniform stable phase difference.

As a method of solving such a problem, a method using a cyclic polyolefin resin (cyclic olefin polymer, COP) has been proposed (Japanese Patent Laid-Open No. 2001-350017, Japanese Patent Laid-Open No. 2004-51928). However, the cyclic polyolefin resin has a problem in that adhesiveness with other substrates and the like is inferior, and there is a problem in that a sufficient retardation is not generated as a retardation film because the retardation change rate is small due to extension.

Therefore, Japanese Patent No. 2886893 uses methyl methacrylate (MMA) as a main component, and extends styrene and maleic anhydride copolymer resin to use as retardation plates. As disclosed in this patent document, when an acrylic resin is used, a phase difference plate can be produced which is transparent and has no haze, and suitable for development of phase difference through stretching.

However, when the retardation film is produced as proposed in the above patent document, due to the properties of the acrylic resin composition, the film is brittle, problems arise in the roll during film processing, and bonding with the polarizer There arises a problem that this becomes difficult, the processing process becomes difficult, and it is difficult to use with a retardation film.

In addition, since the film is expensive and the manufacturing process has a complicated problem, in order to solve this situation is being studied for an optical film excellent in heat resistance, transparency, toughness and the like.

An object of the present invention is to provide an optical film having excellent optical characteristics such as in-plane retardation, thickness direction retardation, optical transparency, excellent heat resistance, toughness, and the like, and which can reduce manufacturing costs.

Accordingly, the present invention, 1) polyarylate resin containing a compound represented by the formula (1), 2) polyester resin containing a compound represented by the formula (2), and 3) an aromatic vinyl monomer and an acid anhydride It provides the resin composition for optical films containing the copolymer resin containing a monomer.

In Chemical Formula 1,

R1 is the same or different from each other, R2 is the same or different from each other, R3 is the same or different from each other, and each independently hydrogen, halogen, C ₁ C ₁₂ is alkyl, or C ₆ to C ₂₀ aryl,

W is C ₁ C ₃₀ alkylidene, C ₁ C ₃₀ alkylene, C ₃ C ₃₀ cycloalkylene, C ₃ Cycloalkyl-C ₃₀ alkenylene, a substituted phenyl C ₁ C ₃₀ represents an alkylene, oxygen, sulfur, sulfoxide group, sulfone group or a single bond,

n is an integer of 5 to 5,000.

In Chemical Formula 2,

R4 is the same or different from each other, R5 is the same or different from each other, R6 is the same or different from each other, and each independently hydrogen, halogen, C ₁ C ₁₂ is alkyl, or C ₆ to C ₂₀ aryl,

p and q are the same as or different from each other, and each independently an integer of 5 to 5,000.

In addition, the present invention is 1) a polyarylate resin containing a compound represented by the formula (1), 2) a polyester resin containing a compound represented by the formula (2), and 3) an aromatic vinyl monomer and an acid anhydride An optical film comprising a blend resin of a copolymer resin containing a monomer is provided.

In addition, the present invention

1) a polyarylate resin comprising a compound represented by Formula 1, a polyester resin comprising a compound represented by Formula 2, and a copolymer resin comprising an aromatic vinyl monomer and an acid anhydride monomer Preparing a blend resin comprising; and

2) forming a film using the blend resin of step 1)

It provides a method for producing an optical film comprising a.

Moreover, this invention provides the liquid crystal display device containing the said optical film.

The optical film according to the present invention is excellent in optical properties such as in-plane retardation, thickness direction retardation, optical transparency, excellent heat resistance, toughness and the like, and can reduce the manufacturing cost of the film.

Hereinafter, the present invention will be described in detail.

The resin composition for an optical film according to the present invention comprises: 1) a polyarylate resin containing the compound represented by Chemical Formula 1, 2) a polyester resin containing the compound represented by Chemical Formula 2, and 3) an aromatic vinyl system. Copolymer resins comprising monomers and acid anhydride monomers.

In the resin composition for optical films according to the present invention, the terminal group of the compound represented by the formula (1) is not particularly limited, and preferably a hydroxyl group (-OH) or a carboxyl group (-COOH).

In the resin composition for an optical film according to the present invention, the compound represented by Chemical Formula 1 is more preferably a compound represented by the following Chemical Formula 3.

In Formula 3, n is an integer of 5 to 5,000.

Said 1) polyarylate-type resin can be manufactured by superposition | polymerization from a dihydric phenol compound and an aromatic dicarboxylic acid type compound.

Although the said dihydric phenol compound is irrelevant to the kind, it is preferable that 1 or more types of dihydric phenol compounds represented by following formula (4) are used.

In Chemical Formula 4,

R1 is the same or different from each other, R2 is the same or different from each other, and each independently hydrogen, halogen, C ₁ C ₁₂ is alkyl, or C ₆ to C ₂₀ aryl,

W is C ₁ C ₃₀ alkylidene, C ₁ C ₃₀ alkylene, C ₃ C ₃₀ cycloalkylene, C ₃ Cycloalkyl-C ₃₀ alkenylene, a substituted phenyl C ₁ C ₃₀ alkylene, oxygen, sulfur, sulfoxide group, sulfone group or a single bond.

Examples of the aromatic dicarboxylic acid compound include terephthalic acid, isophthalic acid, dibenzoic acid, naphthalenedicarboxylic acid, bis (4-carboxyphenyl) methane, 1,2-bis (4-carboxyphenyl) ethane, 2,2-bis The alkyl or halogen group of C ₁ to C ₂ is a (4-carboxyphenyl) propane, bis (4-carboxyphenyl) oxide, bis (4-carboxyphenyl) sulfide, bis (4-carboxyphenyl) sulfone, or an aromatic group thereof. Single or mixtures of substituted aromatic dicarboxylic acids, but is not limited thereto.

In the resin composition for an optical film according to the present invention, the content of the 1) polyarylate resin is preferably 30 to 90% by weight, more preferably 40 to 80% by weight. When the content of 1) polyarylate resin is less than 30% by weight, the optical film may not have sufficient heat resistance, and when it exceeds 90% by weight, it may be difficult to process the resin.

In the resin composition for optical films according to the present invention, the glass transition temperature (Tg) of the 1) polyarylate resin is 180 ° C or more, the refractive index is 1.58 to 1.59, the transmittance is 90% or more, and the weight average molecular weight (Mw) Is preferably 40,000 to 80,000, but is not limited thereto.

In the resin composition for an optical film according to the present invention, the compound represented by the formula (2) is more preferably a compound represented by the following formula (5).

In Formula 5, p and q are the same as or different from each other, and each independently an integer of 5 to 5,000.

The compound represented by Chemical Formula 5 may be prepared by copolymerizing terephthalic acid (Tephthalic acid, TPA), ethylene glycol (ethylene glycol, EG), and cyclohexane dimethanol (CHDM).

In the resin composition for an optical film according to the present invention, the content of the 2) polyester resin is preferably 10 to 70% by weight, more preferably 20 to 60% by weight. When the content of the polyester resin 2) is less than 10% by weight, it may be difficult to process the resin composition, and when it exceeds 70% by weight, there may be a problem in the heat resistance of the resin.

In the resin composition for an optical film according to the present invention, the 2) polyester-based resin has a glass transition temperature (Tg) of 75 to 90 ° C, a refractive index of 1.56 to 1.57, a transmittance of 90% or more, and a weight average molecular weight (Mw) Silver 50,000 ~ 80,000, and melt index (MI, 220 ℃, 5kg) is preferably 7 to 10, but is not limited thereto.

In the resin composition for an optical film according to the present invention, the monomer having a structure in which the benzene nucleus is substituted or unsubstituted with at least one C ₁ to C ₅ alkyl group or halogen group as the aromatic vinyl monomer of the 3) copolymer resin. Preference is given to using. For example, one or more styrene monomers selected from the group consisting of styrene, α-methylstyrene, p-methylstyrene, vinyltoluene and the like are preferable.

As the acid anhydride monomer of the above-mentioned 3) copolymer resin, carboxylic anhydride may be used, and monovalent or divalent or higher polyhydric carboxylic acid anhydride may be used. Preferably, maleic anhydride or a derivative thereof can be used.

The 3) copolymer resin is more preferably a styrene-maleic anhydride copolymer resin, it may include a compound represented by the following formula (6).

The styrene-maleic anhydride copolymer is a styrene-maleic anhydride random copolymer, and the weight average molecular weight is preferably 100,000 to 200,000.

In the resin composition for an optical film according to the present invention, the content of the 3) copolymer resin is preferably 0.1 to 10% by weight, more preferably 0.5 to 5% by weight. 3) Since the copolymer resin imparts polarity to the resin composition, when the content thereof is less than 0.1 wt%, there may be a problem in adhesion to other materials, and when it exceeds 10 wt%, haze may occur.

In the resin composition for optical films according to the present invention, the glass transition temperature (Tg) of the copolymer resin containing the 3) aromatic vinyl monomer and the acid anhydride monomer is 125 ° C or higher, the refractive index is 1.56 to 1.58, and the transmittance. Is preferably at least 90%, but is not limited thereto.

The resin composition for an optical film according to the present invention may further include additives such as a UV absorber, a plasticizer, and a retardation increasing agent.

1 type of said UV absorbers may be used, and 2 or more types may be used together. The UV absorbers include, but are not limited to, triazine-based UV absorbers, triazole-based UV absorbers, and HALS (hindered amine light stabilizer) -based UV absorbers. The triazine-based UV absorber may be commercially available Tinuvin 360, Tinuvin 1577 (Ciba Chemicals), Cyasorb UV-1164, Cyasorb UV-2908, Cyasorb UV-3346 (Cytec), etc. Tinuvin 384, Tinuvin 1130, Cyasorb UV-2337, Cyasorb UV-5411 and the like can be used as a HALS-based UV absorber Cyasorb UV-3853 and the like can be used.

As the plasticizer, plasticizers such as phosphate ester, carboxylic acid ester, phthalic acid and phosphoric acid may be used, and more specifically, triphenyl phosphate, phthalic acid ester, dimethyl phthalate, diethyl phthalate, diphenyl phthalate, and the like. Can be. The content of the plasticizer can be added within the limits not impair the physical properties of the retardation film.

The retardation synergist may be added to control the phase difference of the retardation film, a material having an aromatic ring is mainly used, the number of the aromatic ring is not particularly limited, but preferably about 2 to 6 is suitable. For example, trans-stilbene, diphenylacetylene, trans, trans-1,4-diphenyl-1,3-butadiene (trans, trans-1,4-diphenyl-1, 3-butadiene, biphenyl, fluorine, dibenzofuran, 2,7-dibromofluorene, carbazole, N-vinyl N-vinyl carbazole and the like can be used.

The content of the retardation synergist may vary depending on the desired retardation value and the amount of the additive, and stretching conditions, so long as the optical properties of the retardation film are not impaired.

The content of the additive is preferably 0 to 30 parts by weight based on 100 parts by weight of the polyarylate resin and the polyester resin.

In addition, the optical film according to the present invention is 1) a polyarylate resin containing a compound represented by the formula (1), 2) a polyester resin containing a compound represented by the formula (2), and 3) an aromatic vinyl monomer And blend resins of copolymer resins comprising acid anhydride monomers.

In the optical film according to the present invention, specific details such as the polyarylate resin, the polyester resin, the aromatic vinyl monomer, and the copolymer resin including the acid anhydride monomer are the same as described above. Will be omitted.

It is preferable that it is 20-200 micrometers, and, as for the thickness of the optical film which concerns on this invention, it is more preferable that it is 40-120 micrometers.

In addition, the optical film according to the present invention has a glass transition temperature of 100 to 140 ° C and excellent toughness. In addition, the haze of the optical film is 0.1 to 4%, the transmittance is preferably 88 to 93%.

In the optical film according to the present invention, the in-plane retardation value represented by Equation 1 is 0 to 50 nm, and the thickness direction retardation value represented by Equation 2 is preferably -30 to -200 nm.

R _in = (n _x -n _y ) × d

R _th = (n _z -n _y ) × d

In Equation 1 and Equation 2,

n _x is a refractive index of the direction of the largest refractive index in the plane direction of the film,

n _y is a refractive index in the vertical direction in the n _x direction in the plane direction of the film,

n _z is the refractive index in the thickness direction,

d is the thickness of the film.

In addition, the manufacturing method of the optical film according to the present invention 1) a polyarylate resin represented by the formula (1), a polyester resin represented by the formula (2), and the air containing an aromatic vinyl monomer and an acid anhydride monomer Preparing a blend resin including a copolymer resin; and 2) forming a film using the blend resin of step 1).

The method of manufacturing an optical film according to the present invention may further include 3) uniaxially or biaxially stretching the film.

Through the stretching process of step 3), it is possible to more effectively control the plane direction retardation value and the thickness direction retardation value of the film.

In the method of manufacturing a phase difference film according to the present invention, the method of forming the film of step 2) may use a solution casting method or an extrusion molding method.

The solution casting method is a method of manufacturing a film using a solution (dope) in which a material is dissolved in an organic solvent.

Examples of the organic solvent used in the solution casting method include halogenated hydrocarbons such as methylene chloride, chloroform, dichloroethane, acetone, methyl ethyl ketone, di Ketones such as ethyl ketone, cyclohexanone, di-isopropyl ether, tetrahydrofuran, 1,3-dioxane, 1 Ethers such as 1,4-dioxane, esters such as methyl acetate and ethyl acetate, dimethyl formamide, dimethyl acetamide Amide systems, such as acetamide), etc., but it is not limited to this.

In the solution casting method, the dope may be prepared by a general method known in the art. 10 to 50% by weight of a solid resin such as a blend resin and an additive of the polyarylate resin and the polyester resin may be added to the organic solvent to stir the solution. The production temperature is not particularly limited and can be adjusted according to the characteristics of the organic solvent. This solution may be prepared even under pressurized conditions.

The order of addition of each component is not particularly limited and may be produced under an inert gas such as nitrogen gas. The prepared dope can be passed through a coat hanger type T-die, cast into a chrome plating casting drum or belt, dried on a drying roll and wound up to produce a film.

As a method of forming the film of step 2), in addition to the solution casting method, it may be prepared by the following melt casting method.

Blended resin of polyarylate resin, polyester resin, and copolymer resin comprising aromatic vinyl monomer and acid anhydride monomer was vacuum dried to remove moisture and dissolved oxygen, and then other additives were added, and then the raw material hopper The hopper to the extruder was fed to a nitrogen-substituted single or twin extruder, melted at high temperature to obtain raw material pellets, and the obtained raw material pellets were vacuum dried and nitrogen-substituted from the raw material hopper to the extruder. A single extruder can be melted, passed through a T-die of a coat hanger type, and then produced via a chrome plated casting roll and a drying roll.

The film produced by the solution casting method or the extrusion molding method can obtain a desired phase difference through the stretching step of step 3). The stretching step may be performed in the longitudinal direction (MD) stretching or in the transverse direction (TD) stretching, or both. When extending | stretching both a longitudinal direction and a lateral direction, after extending | stretching either one, you can extend in another direction and you may extend | stretch both directions simultaneously. Stretching can be extended in one step or stretched in multiple steps. When extending | stretching in a longitudinal direction, extending | stretching by the speed difference between rolls can be performed, and when extending | stretching in a lateral direction, a tenter is used. The rail starting angle of the tenter is usually within 10 degrees, thereby suppressing a boeing phenomenon occurring in the lateral stretching and regularly controlling the angle of the optical axis. The same boeing suppression effect can also be obtained by making transverse stretching into multiple stages.

Referring to the stretching process of step 3) in detail as follows.

The longitudinal uniaxial stretching method according to the present invention can be carried out by performing a preheating step, a stretching step and a heat treatment step, respectively, which can be carried out continuously. The longitudinal uniaxial stretching method may be performed using a manufacturing apparatus provided in the order of a preheating zone, a stretching zone and a heat treatment zone.

The preheating step refers to a step of already heating and softening so that the unstretched film can be well stretched in the subsequent stretching step.

In the preheating step, when the glass transition temperature of the unstretched film is called Tg, it is preferable to heat it so that it becomes a fixed temperature in the range of (Tg-30 degreeC)-Tg. The preheating time is preferably 1 to 10 minutes, more preferably 1 to 5 minutes, in order to suppress the deformation more than necessary. If the film is sufficiently preheated in the preheating step, the film is softened sufficiently and there is little variation in the retardation value at the time of stretching.However, preheating for a long time requires a high magnification of the film due to the softening degree of the film, and it is difficult to express sufficient birefringence. do.

In the stretching step proceeding after the preheating step, it is preferable to uniaxially stretch the film in the advancing direction of the film in the temperature range of (Tg-20 ° C) to (Tg + 20 ° C) of the unstretched film. Here, the stretching temperature, the stretching speed, and the draw ratio may be determined by the type, thickness, in-plane retardation value of the retardation film required, and the like. In such a longitudinal uniaxial stretching method, the stretching temperature is more preferably set to (Tg-10 ° C) to (Tg + 10 ° C) of the unstretched film. When the stretching temperature is lower than (Tg-20 ° C) of the unstretched film, the phase difference deviation of the stretched film obtained by concentrating stress when stretching is tended to be large, and when the temperature is higher than (Tg + 20 ° C), the molecular orientation is also high. Low is difficult to express birefringence.

In the method for producing a retardation film according to the present invention, the stretching temperature in step 3) is different depending on the type of resin used, but is usually preferably 80 to 250 ^o C, more preferably 100 to 200 ^o C, More preferably, 120 to 180 ^o C.

In the step 3), the draw ratio is set by the expression of the thickness of the unstretched film and the appropriate retardation value, but is preferably 1.1 to 3 times. When the draw ratio is lower than 1.1 times, it is difficult to obtain a film having a sufficient retardation value due to the low birefringence expressed. When the draw ratio exceeds 3 times, the deviation of the retardation value of the stretched film becomes large, and neck in There is an increasing problem.

In the step 3), the stretching speed is preferably 10 to 500% / min.

In step 3), the ratio of the width to the length of the stretching section of the film is preferably less than 3, more preferably 0.5 to 3, and even more preferably 0.5 to 1.5.

Further, in the heat treatment step performed after the preheating step and the stretching step, for the purpose of fixing the orientation of the longitudinal uniaxially stretched film, the temperature of the film is between (stretch temperature-50 ° C) and (stretch temperature-10 ° C). Cool to the range and heat treatment.

When manufacturing the retardation film according to the present invention described above using a manufacturing apparatus provided in the order of preheating zone, stretching zone and heat treatment zone, the film transferred into the preheating zone, stretching zone and heat treatment zone is continuously heated and Although stretched and heat treated to cool, some intermediate temperature region may inevitably occur at the boundaries of these zones. As a means for reducing this intermediate temperature range as much as possible, although not particularly limited, a narrow slit-shaped passage can be provided where the film moves between the zones. In addition, the other section can maintain the temperature of each zone by a method of shielding with a heat insulating partition wall, a shielding with an air curtain, or a combination thereof.

As described above, the optical film manufactured according to the method of the present invention preferably has an in-plane retardation value of 0 to 50 nm and a thickness direction retardation value of -30 to -200 nm.

In addition, the present invention provides a liquid crystal display device comprising one or two or more optical films.

In particular, since the liquid crystal display according to the present invention may include an optical film having an in-plane retardation value of 0 to 50 nm and a thickness direction retardation value of -30 to -200 nm, it is preferable that the liquid crystal display is a VA mode liquid crystal display device. It is not limited.

A liquid crystal display including one or two or more retardation films will be described in more detail as follows.

In a liquid crystal display device comprising a liquid crystal cell and a first polarizing plate and a second polarizing plate respectively provided on both surfaces of the liquid crystal cell, the optical film may be provided between the liquid crystal cell and the first polarizing plate and / or the second polarizing plate. have. That is, an optical film may be provided between the first polarizing plate and the liquid crystal cell, and one optical film may be provided 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. 2 or more It may be provided.

The first polarizing plate and the second polarizing plate may include a protective film on one or both surfaces. The inner protective film may include a triacetate cellulose (TAC) film, a polynorbornene-based film made of ring opening metathesis polymerization (ROMP), and a hydrogenated cyclic olefin-based polymer that is ring-opened polymerized. ring opening metathesis polymerization followed by hydrogenation) may be a polymer film, a polyester film, or a polynorbornene-based film prepared by addition polymerization. In addition, a film made of a transparent polymer material may be used as a protective film, but is not limited thereto.

In addition, the present invention provides an integrated polarizing plate including a polarizing film and including the optical film according to the present invention on one or both surfaces of the polarizing film as a protective film.

When the retardation film according to the present invention is provided only on one surface of the polarizing film, the other surface may be provided with a protective film known in the art.

As the polarizing film, a film made of polyvinyl alcohol (PVA) containing iodine or dichroic dye may be used. The polarizing film may be prepared by dyeing iodine or dichroic dye on a PVA film, but a method of manufacturing the same is not particularly limited. In the present specification, the polarizing film means a state not including a protective film, and the polarizing plate means a state including a polarizing film and a protective film.

In the integrated polarizing plate of the present invention, the protective film and the polarizing film may be laminated by a method known in the art.

For example, the lamination of the protective film and the polarizing film may be made by an adhesive method using an adhesive. That is, first, an adhesive is coated on the surface of the PVA film, which is a protective film of the polarizing film or a polarizing film, using a roll coater, a gravure coater, a bar coater, a knife coater or a capillary coater. Before the adhesive is completely dried, the protective film and the polarizing film are laminated by heat pressing at room temperature or pressing at room temperature. 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 polarizing plate are laminated include one-component or two-component PVA adhesives, polyurethane adhesives, epoxy adhesives, styrene butadiene rubber (SBR) adhesives, or hot melt adhesives, but are not limited thereto. Do not. When using a polyurethane adhesive, it is preferable to use the polyurethane adhesive manufactured using the aliphatic isocyanate type compound which does not yellow by light. When using one-component or two-component dry laminate adhesives or adhesives with relatively low reactivity between isocyanates and hydroxyl groups, a solution-type adhesive diluted with an acetate solvent, a ketone solvent, an ether solvent, or an aromatic solvent may be used. Can also be used. At this time, it is preferable that adhesive viscosity is a low viscosity type of 5,000 cps or less. It is preferable that the adhesives have excellent storage stability and have a light transmittance of 90% or more at 400 to 800 nm.

A tackifier can also be used if it can exert sufficient adhesive force. It is preferable that the adhesive is sufficiently cured by heat or ultraviolet rays after lamination, and thus the mechanical strength is improved to the level of the adhesive. It is preferable.

Specific examples of the pressure-sensitive adhesive that can be used include a natural rubber, a synthetic rubber or an elastomer having excellent optical transparency, a vinyl chloride / vinyl acetate copolymer, a polyvinyl alkyl ether, a polyacrylate or a modified polyolefin-based pressure-sensitive adhesive, and a curing type in which a curing agent such as isocyanate is added thereto. An adhesive is mentioned.

In addition, the present invention provides a liquid crystal display including the integrated polarizer.

Even when the liquid crystal display according to the present invention includes the aforementioned integrated polarizing plate, one or more optical films according to the present invention may be further included between the polarizing plate and the liquid crystal cell.

Hereinafter, preferred examples are provided to aid in understanding the present invention. However, the following examples are merely provided to more easily understand the present invention, and the contents of the present invention are not limited thereto.

< Example >

< Example  1>

A polyarylate resin (PAR) having a weight average molecular weight of 55,000, a polyester resin (PETG) having a weight average molecular weight of 60,000, and a styrene-maleic anhydride copolymer resin (S-MAH) having a weight average molecular weight of 185,000 were 38 The resin composition uniformly mixed at a weight ratio of 60: 2 was supplied to a 16 φ extruder in which nitrogen was substituted from the raw material hopper to the extruder, and melted at 250 ° C. to prepare a raw material pellet.

After drying the prepared pellet (pellet), an extruded film having a thickness of 60 μm was prepared at 260 ° C. using an extruder including a T-die. The physical property values of the film thus prepared, the retardation values of the stretched film, and the like are shown in Table 2 below.

< Example  2 to 4>

A film was prepared using the same method as in Example 1, except that the composition shown in Table 1 was used. The physical property values of the prepared film, the phase difference values of the stretched film, and the like are shown in Table 2 below.

< Comparative example  1 to 3>

A film was prepared using the same method as in Example 1, except that the composition shown in Table 1 was used. The physical property values of the film thus prepared, the retardation values of the stretched film, and the like are shown in Table 2 below.

PAR: U-100 by Unitica with a weight average molecular weight of 55,000

PETG: K2012 by SK chemical with a weight average molecular weight of 60,000

S-MAH: Nova D332 with a weight average molecular weight of 185,000

(1) Tg (glass transition temperature): It measured using Pyris 6 Differential Scanning Calroimeter (DSC) from Perkin Elmer.

(2) Toughness: The film produced to a thickness of 60 占 퐉 was observed by bending 10 times by hand, and evaluated according to the following criteria.

○: never broken,

△: 1 to 3 times broken,

X: Cut off 4 times.

(3) Adhesiveness: The adhesive force with the device was measured by the Peel-off test.

(4) Permeability, haze: Measured according to ASTM 1003 method.

(5) Retardation value: The refractive index was measured with an Abbe refractometer and measured by the above equations (1) and (2) using a sample inclination type automatic birefringence meter.

Claims (21)

1) a polyarylate resin comprising a compound represented by the following formula (1), 2) a polyester resin comprising a compound represented by the following formula (2), and 3) an air comprising an aromatic vinyl monomer and an acid anhydride monomer Resin composition for optical films containing coalescing resin: [Formula 1]

In Chemical Formula 1, R1 is the same or different from each other, R2 is the same or different from each other, R3 is the same or different from each other, and each independently hydrogen, halogen, C ₁ C ₁₂ is alkyl, or C ₆ to C ₂₀ aryl, W is C ₁ C ₃₀ alkylidene, C ₁ C ₃₀ alkylene, C ₃ C ₃₀ cycloalkylene, C ₃ Cycloalkyl-C ₃₀ alkenylene, a substituted phenyl C ₁ C ₃₀ represents an alkylene, oxygen, sulfur, sulfoxide group, sulfone group or a single bond, n is an integer from 5 to 5,000, [Formula 2]

In Chemical Formula 2, R4 is the same or different from each other, R5 is the same or different from each other, R6 is the same or different from each other, and each independently hydrogen, halogen, C ₁ C ₁₂ is alkyl, or C ₆ to C ₂₀ aryl, p and q are the same as or different from each other, and each independently an integer of 5 to 5,000. The resin composition for an optical film according to claim 1, wherein the compound represented by Formula 1 is a compound represented by Formula 3 below: [Formula 3]

In Formula 3, n is an integer of 5 to 5,000. The resin composition for an optical film according to claim 1, wherein the content of the 1) polyarylate resin is 30 to 90 wt%. The method according to claim 1, wherein the glass transition temperature (Tg) of the 1) polyarylate resin is 180 ℃ or more, the refractive index is 1.58 ~ 1.59, the transmittance is 90% or more, and the weight average molecular weight (Mw) is characterized in that 40,000 ~ 80,000. The resin composition for optical films which makes it a. The resin composition of claim 1, wherein the compound represented by Chemical Formula 2 is a compound represented by the following Chemical Formula 5. [Formula 5]

In Formula 5, p and q are the same as or different from each other, and each independently an integer of 5 to 5,000. The resin composition for an optical film according to claim 1, wherein the content of the 2) polyester resin is 10 to 70 wt%. The method according to claim 1, wherein 2) the polyester resin has a glass transition temperature (Tg) of 75 to 90 ℃, refractive index of 1.56 to 1.57, transmittance of 90% or more, weight average molecular weight (Mw) of 50,000 to 80,000, and melting The index (MI, 220 degreeC, 5 kg) is 7-10, The resin composition for optical films characterized by the above-mentioned. The resin composition for an optical film according to claim 1, wherein the 3) copolymer resin is a styrene-maleic anhydride copolymer resin. The resin composition of claim 1, wherein the 3) copolymer resin is a styrene-maleic anhydride random copolymer and has a weight average molecular weight of 100,000 to 200,000. The resin composition for an optical film according to claim 1, wherein the 3) copolymer resin includes a compound represented by Formula 6 below: [Formula 6]

The resin composition for an optical film according to claim 1, wherein the content of the 3) copolymer resin is 0.1 to 10 wt%. The resin composition for an optical film according to claim 1, wherein the glass transition temperature (Tg) of the copolymer resin 3 is 125 ° C or more, the refractive index is 1.56 to 1.58, and the transmittance is 90% or more. The resin composition for an optical film according to claim 1, wherein the resin composition for an optical film further comprises at least one additive selected from the group consisting of a UV absorber, a plasticizer, and a retardation increasing agent. 1) a polyarylate resin comprising a compound represented by the following formula (1), 2) a polyester resin comprising a compound represented by the following formula (2), and 3) an air comprising an aromatic vinyl monomer and an acid anhydride monomer Optical films comprising blended resins of copolymer resins: [Formula 1]

In Chemical Formula 1, R1 is the same or different from each other, R2 is the same or different from each other, R3 is the same or different from each other, and each independently hydrogen, halogen, C ₁ C ₁₂ is alkyl, or C ₆ to C ₂₀ aryl, W is C ₁ C ₃₀ alkylidene, C ₁ C ₃₀ alkylene, C ₃ C ₃₀ cycloalkylene, C ₃ Cycloalkyl-C ₃₀ alkenylene, a substituted phenyl C ₁ C ₃₀ represents an alkylene, oxygen, sulfur, sulfoxide group, sulfone group or a single bond, n is an integer from 5 to 5,000, [Formula 2]

In Chemical Formula 2, R4 is the same or different from each other, R5 is the same or different from each other, R6 is the same or different from each other, and each independently hydrogen, halogen, C ₁ C ₁₂ is alkyl, or C ₆ to C ₂₀ aryl, p and q are the same as or different from each other, and each independently an integer of 5 to 5,000. The optical film according to claim 14, wherein the in-plane retardation value of the optical film represented by Equation 1 is 0 to 50 nm, and the thickness direction retardation value represented by Equation 2 is -30 to -200 nm. : [Equation 1] R _in = (n _x -n _y ) × d [Equation 2] R _th = (n _z -n _y ) × d In Equation 1 and Equation 2, n _x is a refractive index of the direction of the largest refractive index in the plane direction of the film, n _y is a refractive index in the vertical direction in the n _x direction in the plane direction of the film, n _z is the refractive index in the thickness direction, d is the thickness of the film. 1) preparing a blend resin comprising a polyarylate resin represented by Formula 1 below, a polyester resin represented by Formula 2 below, and a copolymer resin comprising an aromatic vinyl monomer and an acid anhydride monomer, And 2) forming a film using the blend resin of step 1) Method for producing an optical film comprising: [Formula 1]

In Chemical Formula 1, R1 is the same or different from each other, R2 is the same or different from each other, R3 is the same or different from each other, and each independently hydrogen, halogen, C ₁ C ₁₂ is alkyl, or C ₆ to C ₂₀ aryl, W is C ₁ C ₃₀ alkylidene, C ₁ C ₃₀ alkylene, C ₃ C ₃₀ cycloalkylene, C ₃ Cycloalkyl-C ₃₀ alkenylene, a substituted phenyl C ₁ C ₃₀ represents an alkylene, oxygen, sulfur, sulfoxide group, sulfone group or a single bond, n is an integer from 5 to 5,000, [Formula 2]

In Chemical Formula 2, R4 is the same or different from each other, R5 is the same or different from each other, R6 is the same or different from each other, and each independently hydrogen, halogen, C ₁ C ₁₂ is alkyl, or C ₆ to C ₂₀ aryl, p and q are the same as or different from each other, and each independently an integer of 5 to 5,000. The method of claim 16, wherein the method of forming the film of step 2) uses a solution casting method or an extrusion molding method. A liquid crystal display device comprising one or two or more optical films of claim 14 or 15. 19. The liquid crystal display of claim 18, wherein the liquid crystal display is in a vertical alignment (VA) mode. An integrated polarizing plate comprising a polarizing film, comprising the optical film of claim 14 or 15 as a protective film on one or both surfaces of the polarizing film. A liquid crystal display device comprising the integrated polarizing plate of claim 20.