WO2012133876A1 - Plaque polarisante - Google Patents

Plaque polarisante Download PDF

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Publication number
WO2012133876A1
WO2012133876A1 PCT/JP2012/058784 JP2012058784W WO2012133876A1 WO 2012133876 A1 WO2012133876 A1 WO 2012133876A1 JP 2012058784 W JP2012058784 W JP 2012058784W WO 2012133876 A1 WO2012133876 A1 WO 2012133876A1
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film
propylene
based resin
resin film
polarizing plate
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PCT/JP2012/058784
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English (en)
Japanese (ja)
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雄平 猪口
弘明 高畑
知大 岡田
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住友化学株式会社
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Publication of WO2012133876A1 publication Critical patent/WO2012133876A1/fr

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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

Definitions

  • the present invention relates to a polarizing plate in which a propylene-based resin film is laminated as a protective film on at least one surface of a polarizing film made of a polyvinyl alcohol-based resin.
  • liquid crystal display devices are rapidly expanding as thin display devices such as liquid crystal televisions, liquid crystal monitors, and personal computers.
  • market for liquid crystal televisions is remarkably expanding, and the demand for cost reduction is very high.
  • Liquid crystal display devices such as liquid crystal televisions are stacked and used in a predetermined configuration using the polarizing plate as a constituent member.
  • a polarizing plate is usually a protective film, for example, a cellulose acetate-based protective film represented by triacetyl cellulose, with an adhesive layer on one or both sides of a polarizing film made of a polyvinyl alcohol-based resin to which a dichroic dye is adsorbed and oriented. It is the composition which laminated. This is bonded to the liquid crystal cell with an adhesive via another optical film as necessary, to obtain a component part of the liquid crystal display device.
  • a protective film for example, a cellulose acetate-based protective film represented by triacetyl cellulose, with an adhesive layer on one or both sides of a polarizing film made of a polyvinyl alcohol-based resin to which a dichroic dye is adsorbed and oriented. It is the composition which laminated. This is bonded to the liquid crystal cell with an adhesive via another optical film as necessary, to obtain a component part of the liquid crystal display device.
  • a hydrophilic protective film when used, the moisture content of the polarizing film made of a polyvinyl alcohol-based resin is affected under high-temperature and high-humidity conditions, and the performance as a polarizing plate may change somewhat.
  • a protective film made of a hydrophilic resin instead of a protective film made of a hydrophilic resin, a polarizing plate having a configuration in which a hydrophobic protective film made of, for example, a propylene-based resin is used and the influence of the environment can be suppressed as much as possible has been studied (for example, JP2009). -258588-A etc.).
  • the polarizing plate described in JP2009-258588-A is a polarizing plate that has little influence on the polarizing film due to the use environment because a film made of a hydrophobic material is disposed on both sides of the polarizing film, but is a protective material made of propylene-based resin. Since the film is a flexible material with a low glass transition temperature of the propylene resin, when the polarizing film made of the polyvinyl alcohol resin greatly shrinks when used at a high temperature, the performance of suppressing the shrinkage may be slightly insufficient. In addition, there is a problem that the polarizing plate may be deformed.
  • the propylene-based resin film as the protective film is too flexible.
  • the propylene-based resin film may be formed by a method in which many crystal components are formed. However, if the propylene-based resin film is produced under more slow cooling conditions, the crystallinity can be increased, but the transparency is impaired, which is not preferable.
  • the present invention has been made in order to solve the above-mentioned problems, and the object of the present invention is to provide a propylene-based resin film with improved rigidity while maintaining transparency, and severe conditions such as high temperature conditions. It is to provide a polarizing plate that is hardly deformed in the environment.
  • a polarizing plate comprising a polarizing film made of a polyvinyl alcohol-based resin and a transparent resin film bonded to both surfaces of the polarizing film via an adhesive, at least one of the transparent resin films being a nucleating agent Is a propylene-based resin film containing 50 to 6000 ppm.
  • the nucleating agent is N, N ′, N ′′ -tris (2-methylcyclohexyl) -propane-1,2,3-tricarboxamide represented by the following structural formula: 4].
  • a polarizing plate that is provided with a propylene-based resin film with improved rigidity while maintaining transparency and is less likely to be deformed in a severe environment such as a high temperature condition.
  • Polarized light when the horizontal axis represents the total haze (%) of a film obtained by forming a propylene-based resin with or without a nucleating agent and pasted it on a polarizing film to form a polarizing plate
  • the total light transmittance (%) at the time of measuring the internal haze of the target film in FIG. 1 is plotted on the horizontal axis, and the amount of decrease in the single transmittance (%) of the polarizing plate when the polarizing film is applied to the polarizing film. Is a graph in which the relationship between the two is plotted.
  • the polarizing film used in the polarizing plate of the present invention is obtained by adsorbing and orienting a dichroic dye on a uniaxially stretched polyvinyl alcohol resin film.
  • the polyvinyl alcohol-based resin can be obtained by saponifying a polyvinyl acetate-based resin.
  • the polyvinyl acetate resin in addition to polyvinyl acetate which is a homopolymer of vinyl acetate, copolymers of vinyl acetate and other monomers copolymerizable therewith, such as ethylene-vinyl acetate copolymer, etc. Is mentioned.
  • Examples of other monomers copolymerizable with vinyl acetate include unsaturated carboxylic acids, olefins, vinyl ethers, unsaturated sulfonic acids, and acrylamides having an ammonium group.
  • the saponification degree of the polyvinyl alcohol resin is usually 85 to 100 mol%, preferably 98 mol% or more.
  • These polyvinyl alcohol resins may be modified.
  • polyvinyl formal, polyvinyl acetal, polyvinyl butyral and the like modified with aldehydes may be used.
  • the degree of polymerization of the polyvinyl alcohol-based resin is usually in the range of 1000 to 10000, preferably in the range of 1500 to 5000.
  • a film obtained by forming such a polyvinyl alcohol resin is used as an original film of a polarizing film.
  • the method for forming the polyvinyl alcohol-based resin is not particularly limited, and can be formed by a conventionally known appropriate method.
  • the film thickness of the raw film made of the polyvinyl alcohol resin is not particularly limited, but is, for example, about 10 to 150 ⁇ m.
  • a polarizing film usually includes a process of dyeing a polyvinyl alcohol resin film with a dichroic dye and adsorbing the dichroic dye (dyeing process), and a polyvinyl alcohol resin film on which the dichroic dye is adsorbed. It is manufactured through a step of treating with an acid aqueous solution (boric acid treatment step) and a step of washing with water after the treatment with the boric acid aqueous solution (water washing treatment step).
  • the polyvinyl alcohol-based resin film is usually uniaxially stretched, but this uniaxial stretching may be performed before the dyeing treatment step or during the dyeing treatment step, It may be performed after the dyeing process.
  • this uniaxial stretching may be performed before the boric acid treatment step or during the boric acid treatment step.
  • atmosphere may be sufficient
  • stretches in the state swollen with the solvent may be sufficient.
  • the draw ratio is usually about 3 to 8 times.
  • the dyeing of the polyvinyl alcohol-based resin film with the dichroic dye in the dyeing process is performed, for example, by immersing the polyvinyl alcohol-based resin film in an aqueous solution containing the dichroic dye.
  • the dichroic dye for example, iodine, a dichroic dye or the like is used.
  • dichroic dyes include C.I. I. Dichroic direct dyes composed of disazo compounds such as DIRECT RED 39, and dichroic direct dyes composed of compounds such as trisazo and tetrakisazo are included.
  • the polyvinyl alcohol-type resin film performs the immersion process to water before a dyeing process.
  • iodine When iodine is used as the dichroic dye, a method of dyeing a polyvinyl alcohol-based resin film in an aqueous solution containing iodine and potassium iodide is usually employed.
  • the iodine content in this aqueous solution is usually 0.01 to 1 part by weight per 100 parts by weight of water
  • the potassium iodide content is usually 0.5 to 20 parts by weight per 100 parts by weight of water.
  • the temperature of the aqueous solution used for dyeing is usually 20 to 40 ° C.
  • the immersion time (dyeing time) in this aqueous solution is usually 20 to 1800 seconds.
  • a method of immersing and dyeing a polyvinyl alcohol-based resin film in an aqueous solution containing an aqueous dichroic dye is usually employed.
  • the content of the dichroic dye in this aqueous solution usually, 1 ⁇ 10 -4 ⁇ 10 parts by weight per 100 parts by weight of water, preferably 1 ⁇ 10 -3 ⁇ 1 parts by weight, particularly preferably 1 ⁇ 10 - 3 to 1 ⁇ 10 ⁇ 2 parts by weight.
  • This aqueous solution may contain an inorganic salt such as sodium sulfate as a dyeing assistant.
  • the temperature of the dye aqueous solution used for dyeing is usually 20 to 80 ° C.
  • the immersion time (dyeing time) in this aqueous solution is usually 10 to 1800 seconds. is there.
  • the boric acid treatment step is performed by immersing a polyvinyl alcohol resin film dyed with a dichroic dye in a boric acid-containing aqueous solution.
  • the amount of boric acid in the boric acid-containing aqueous solution is usually 2 to 15 parts by weight, preferably 5 to 12 parts by weight per 100 parts by weight of water.
  • the boric acid-containing aqueous solution used in this boric acid treatment process preferably contains potassium iodide.
  • the amount of potassium iodide in the boric acid-containing aqueous solution is usually 0.1 to 15 parts by weight, preferably 5 to 12 parts by weight, per 100 parts by weight of water.
  • the immersion time in the boric acid-containing aqueous solution is usually 60 to 1200 seconds, preferably 150 to 600 seconds, and more preferably 200 to 400 seconds.
  • the temperature of the boric acid-containing aqueous solution is usually 50 ° C. or higher, preferably 50 to 85 ° C., more preferably 60 to 80 ° C.
  • the polyvinyl alcohol-based resin film after the boric acid treatment described above is washed with water, for example, by immersing it in water.
  • the temperature of water in the water washing treatment is usually 5 to 40 ° C., and the immersion time is usually 1 to 120 seconds.
  • a drying treatment is usually performed to obtain a polarizing film.
  • the drying process is preferably performed using, for example, a hot air dryer or a far infrared heater.
  • the temperature for the drying treatment is usually 30 to 100 ° C., preferably 50 to 80 ° C.
  • the time for the drying treatment is usually 60 to 600 seconds, preferably 120 to 600 seconds.
  • the polyvinyl alcohol resin film is subjected to uniaxial stretching, dyeing with a dichroic dye, boric acid treatment and water washing treatment to obtain a polarizing film.
  • the thickness of this polarizing film is usually in the range of 5 to 40 ⁇ m.
  • the polarizing plate of the present invention is produced by laminating a transparent resin film on both sides of such a polarizing film via an adhesive, and at least one of the transparent resin films to be laminated on both sides is manufactured.
  • the polarizing plate protective film is made of a propylene-based resin film containing 50 to 6000 ppm of a nucleating agent.
  • a propylene-based resin film containing 50 to 6000 ppm of a nucleating agent is bonded to at least one surface of the polarizing film as a protective film.
  • the content of the nucleating agent is within the above range, the propylene-based resin film is improved in rigidity while maintaining transparency. This makes it a good polarizing plate with little deformation even under various usage environments.
  • the propylene-based resin may be a propylene homopolymer or a copolymer of propylene and another monomer copolymerizable therewith. These may be used in combination. Examples of other monomers copolymerizable with propylene include ethylene and ⁇ -olefin.
  • the ⁇ -olefin has 4 or more carbon atoms, preferably an ⁇ -olefin having 4 to 12 carbon atoms.
  • ⁇ -olefin having 4 to 12 carbon atoms include linear monoolefins such as 1-butene, 1-pentene, 1-hexene, 1-heptene, 1-octene and 1-decene; Branched monoolefins such as 3-methyl-1-butene, 3-methyl-1-pentene and 4-methyl-1-pentene; vinylcyclohexane and the like.
  • the copolymer of propylene and other monomers copolymerizable therewith may be a random copolymer or a block copolymer.
  • the propylene-based resin is composed of the copolymer
  • specific examples of the copolymer include propylene-ethylene random copolymer, propylene-1-butene random copolymer, and propylene-ethylene-1-butene random copolymer.
  • examples thereof include a binary or ternary copolymer of propylene and one or more monomers selected from the group consisting of ethylene and an ⁇ -olefin having 4 to 12 carbon atoms. .
  • the propylene-derived structural unit can be selected according to characteristics such as heat resistance.
  • characteristics such as heat resistance.
  • high heat resistance it is preferable to contain a large amount of structural units derived from propylene, specifically 96% by weight or more.
  • the content rate of the structural unit derived from the said other monomer in a copolymer is infrared (IR) according to the method described on page 616 of "Polymer Analysis Handbook" (1995, published by Kinokuniya). ) It can be obtained by performing a spectrum measurement.
  • the stereoregularity of the propylene homopolymer and the propylene copolymer may be any of isotactic, syndiotactic, and atactic, but is said to have excellent balance of rigidity and transparency after being formed into a film. From the viewpoint, a propylene-based polymer having high isotacticity is preferable.
  • the propylene-based resin may be a polymer or copolymer polymerized using a known polymerization catalyst.
  • the polymerization catalyst include the following.
  • A a Ti—Mg-based catalyst comprising a solid catalyst component containing magnesium, titanium and halogen as essential components;
  • B a catalyst system in which a solid catalyst component containing magnesium, titanium and halogen as essential components is combined with an organoaluminum compound and, if necessary, a third component such as an electron donating compound,
  • C Metallocene catalyst.
  • Examples of the solid catalyst component (A) include catalyst systems described in JPS61-218606-A, JPS61-287904-A, JPH07-216017-A, and the like.
  • Preferred examples of the organoaluminum compound in the catalyst system of (B) include triethylaluminum, triisobutylaluminum, a mixture of triethylaluminum and diethylaluminum chloride, tetraethyldialumoxane, and the like.
  • Preferable examples include cyclohexylethyldimethoxysilane, tert-butylpropyldimethoxysilane, tert-butylethyldimethoxysilane, dicyclopentyldimethoxysilane and the like.
  • metallocene catalyst (C) include the catalyst systems described in JP2588251-B2, JP2627669-B2, JP2668732-B2, and the like.
  • Propylene resins include, for example, solution polymerization using an inert solvent typified by hydrocarbon compounds such as hexane, heptane, octane, decane, cyclohexane, methylcyclohexane, benzene, toluene, and xylene, and liquid monomers as solvents. It can be produced by a bulk polymerization method to be used or a gas phase polymerization method in which a gaseous monomer is polymerized as it is. Polymerization by these methods may be carried out batchwise or continuously.
  • an inert solvent typified by hydrocarbon compounds such as hexane, heptane, octane, decane, cyclohexane, methylcyclohexane, benzene, toluene, and xylene, and liquid monomers as solvents. It can be produced by a bulk polymerization method to be used or a gas phase polymerization
  • the propylene-based resin film used in the present invention is formed into a film by extruding the propylene-based resin by a melt extrusion method.
  • the propylene-based resin is a temperature of 230 ° C. and a load in accordance with JIS K7210.
  • the melt flow rate (MFR) measured at 21.18N is preferably in the range of 1 to 30 g / 10 min, more preferably in the range of 1 to 20 g / 10 min, and 1.5 to 15 g. More preferably, it is within the range of / 10 minutes.
  • the propylene resin described above is formed into a film from a resin composition in which a nucleating agent is blended at a ratio of 50 to 6000 ppm, and this is at least a transparent resin film bonded to both surfaces of a polarizing film.
  • ppm is based on weight.
  • the nucleating agent is a compound that becomes a nucleus of crystallization when the propylene-based resin composition is solidified from a molten state and crystallized.
  • Such a polarizing plate bonded with a propylene-based resin film in which a nucleating agent is blended at a predetermined ratio has improved rigidity particularly at high temperatures while maintaining transparency. If the blending ratio of the nucleating agent is less than 50 ppm, the effect of improving the rigidity may be insufficient, and if the ratio exceeds 6000 ppm, problems may occur when forming a film. is there.
  • the problem at the time of film formation is that the molten film of propylene-based resin extruded from the T-die is cooled and solidified by contact with a cooling roll and wound into a film.
  • the following will be taken. That is, for one thing, if the amount of the nucleating agent is too large, the crystallization speed becomes too fast, so that the crystallization of the molten film starts before contacting the cooling roll, and it becomes impossible to adhere to the cooling roll uniformly.
  • the film tends to be a film having a rough surface.
  • the melted film extruded from the T-die is placed in contact with the cooling roll by static electricity or air before the center in the width direction in order to ensure molding stability. If the amount of the nucleating agent is too large, crystallization will occur from the moment the molten film contacts the both ends of the cooling roll, even if crystallization does not occur in the molten film before contacting the cooling roll. As a result, only both end portions of the film first undergo volume contraction and stress is applied to the central portion. As a result, only the central portion is poorly adhered to the cooling roll, and the appearance of the film is easily damaged. From these viewpoints, the addition amount of the nucleating agent is set to 50 to 6000 ppm as described above.
  • Propylene resin nucleating agents include inorganic compounds and organic compounds.
  • Talc is a typical inorganic nucleating agent.
  • Propylene-based resin nucleating agents may be classified into a dispersion type and a dissolution type.
  • the dispersion type nucleating agent is dispersed in the resin without being dissolved even in the molten propylene resin, and becomes a starting point of crystal growth in the cooling process.
  • Talc which is an inorganic compound, is classified as a dispersion type nucleating agent.
  • the melt-type nucleating agent dissolves in the molten propylene resin, and the nucleating agent itself forms a three-dimensional network by hydrogen bonding in the molten propylene resin during the cooling process.
  • the melt-type nucleating agent is composed exclusively of organic compounds.
  • the melt type nucleating agent will be described later.
  • the dispersion-type nucleating agent is dispersed in the molten propylene-based resin and becomes the starting point of crystal growth in the cooling process. Therefore, the amount of addition is within the range of 50 to 6000 ppm. However, depending on the addition amount, the transmittance may be lowered by the nucleating agent itself, so the preferable addition amount is 50 to 2000 ppm. On the other hand, when a melt-type nucleating agent is used, it is sufficient to add an amount capable of forming a network, and therefore a preferable addition amount is 50 to 1500 ppm.
  • Dispersion type organic nucleating agents include monocarboxylic acid metal salt compounds, dicarboxylic acid metal salt compounds, phosphate ester metal salt compounds, and rosin ester metal salt compounds.
  • examples of the monocarboxylic acid metal salt nucleating agent include sodium benzoate.
  • dicarboxylic acid metal salt-based nucleating agent bicyclo [2.2.1] heptane-2,3-dicarboxylate having the structure of the following formula (1) and cyclohexane having the structure of the following formula (2)
  • An example is calcium 1,2-dicarboxylate.
  • Examples of the phosphoric acid ester metal salt nucleating agent include [phosphoric acid ⁇ 2,2'-methylenebis (4,6-di-tert-butylphenyl) ⁇ ] sodium having the structure of the following formula (3).
  • Examples of the rosin ester metal salt nucleating agent include magnesium dehydroabietic acid having a structure of the following formula (4).
  • the melt-type nucleating agent includes sorbitol-based compounds and trisamide-based compounds.
  • sorbitol nucleating agent 1-O, 3-O having the structure of the following formula (5); 2-O, 4-O-bis (4-methylbenzylidene) -D-sorbitol, the following formula (6) 1-O, 3-O having the structure: 2-O, 4-O-bis (4-ethylbenzylidene) -D-sorbitol, 1-O, 3-O having the structure of the following formula (7); 2 -O, 4-O-bis (3,4-dimethylbenzylidene) -D-sorbitol, and 1-O, 3-O having the structure of the following formula (8); 2-O, 4-O-bis (4 -Propylbenzylidene) -1-propyl-D-sorbitol is exemplified.
  • N, N ′, N ′′ -tricyclohexyl-1,3,5-benzenetricarboxamide having the structure of the following formula (9), and the structure of the following formula (10) are used.
  • N, N ′, N ′′ -tris (2-methylcyclohexyl) -propane-1,2,3-tricarboxamide is exemplified.
  • the nucleating agents exemplified above can be obtained from manufacturers such as Japan's ADEKA Co., Ltd., Shin Nippon Rika Co., Ltd., and US MILIKEN CHEMICAL.
  • a dispersed organic nucleating agent composed of a phosphate ester metal salt compound or a carboxylic acid metal salt compound or a sorbitol compound.
  • a melt type nucleating agent composed of a trisamide compound is preferable.
  • Tricarboxamide is a preferred example.
  • calcium cyclohexane-1,2-dicarboxylate having the structure of the above formula (2) and N, N ′, N ′′ -tris (2-methylcyclohexyl) -propane- having the structure of the above formula (10) 1,2,3-Tricarboxamide is a preferred nucleating agent because it has a high effect of increasing rigidity while maintaining the transparency of the propylene-based resin film with a small addition amount.
  • the amount of nucleating agent was set to 250 ppm or more from the viewpoint of reducing the total haze of the resin film. It is preferable to make it small.
  • the haze is defined by (diffuse transmittance / total light transmittance) ⁇ 100 (%) as defined in JIS K7136: 2000 “How to Obtain Haze of Plastic-Transparent Material”.
  • FIG. 1 shows the total haze (unit:%) of a film obtained by forming a propylene-based resin with or without a nucleating agent, including data of Examples and Comparative Examples described later. Is the amount of decrease in the single transmittance (unit:%) of the polarizing plate when iodine is adsorbed and oriented on polyvinyl alcohol, and this is applied to a polarizing film that gives a certain single transmittance.
  • the amount of decrease in single transmittance (%) when used as a polarizing plate is obtained by subtracting the single transmittance when a polarizing plate is used by attaching a propylene-based resin film from the single transmittance of the polarizing film itself. Value.
  • a polarizing plate is prepared by laminating a propylene-based resin film on one surface of a polarizing film and a cycloolefin-based resin film on the other surface, and obtaining the single transmittance. Yes.
  • FIG. 1 shows that the total haze of the propylene-based resin film and the amount of decrease in the single transmittance (%) of the polarizing plate hardly correlate.
  • the total haze described above is a value calculated as the sum of internal haze caused by foreign matter or crystal grain boundaries existing inside the film and external haze caused by irregularities on the film surface (also called surface haze). is there.
  • the internal haze itself is obtained by measuring the total light transmittance and the diffuse transmittance by entering light in a state where the resin film is immersed in a liquid having substantially the same refractive index as that of the resin film. Therefore, the total light transmittance (unit:%) when measuring the internal haze was considered as a new index.
  • the total light transmittance when measuring the internal haze corresponds to the total light transmittance in a state in which reflection and diffusion on the film surface are virtually eliminated.
  • FIG. 2 shows the total light transmittance (unit:%) when measuring the internal haze of the target film in FIG. 1 on the horizontal axis, and shows the amount of decrease in the single transmittance (unit:%) of the same polarizing plate as in FIG.
  • the total light transmittance at the time of measuring the internal haze of the propylene-based resin film that is, the film surface It has been found that it is effective to bring the total light transmittance close to 100% in a state where the reflection and diffusion of the light is virtually eliminated.
  • the total light transmittance is preferably 98% or more, more preferably 99% or more, and particularly preferably 99.5% or more.
  • the nucleating agent By blending the nucleating agent, crystallization when the propylene-based resin is solidified is promoted, and the diffusion transmittance is reduced. Therefore, although the total haze itself is reduced, the internal haze caused by the grain boundary is developed to some extent. Therefore, the total light transmittance tends to be somewhat lost when measuring the internal haze, that is, in a state where the reflection and diffusion of the surface are virtually eliminated. Therefore, it is also preferable that the crystal grains themselves do not become too small.
  • a pellet made of a resin composition containing 1 to 10 parts by weight of a nucleating agent with respect to 100 parts by weight of a propylene-based resin (sometimes referred to as “nucleating agent master batch pellet”) is manufactured in advance.
  • a method of melt-mixing this and propylene-based resin pellets to form a film so that the nucleating agent is in a predetermined amount (2) Propylene-based resin composition pellets in which a predetermined amount of a nucleating agent is blended with a propylene-based resin, and the pellet is melt-kneaded to form a film, (3) A method in which a propylene-based resin is melt-kneaded with a predetermined amount of a nucleating agent and formed into a film.
  • a nucleating agent master batch pellet is manufactured in advance as in (1), and this is not mixed with a nucleating agent.
  • a method of melt-kneading with propylene-based resin pellets is preferred.
  • Preparation of a nucleating agent master batch pellet in the method (1) and preparation of a propylene-based resin composition pellet containing a predetermined amount of the nucleating agent in the method (2) are performed by uniaxial or biaxial extrusion.
  • a twin screw extruder is preferably used from the viewpoint of increasing the shear rate and more uniformly dispersing the nucleating agent in the propylene resin.
  • antioxidants such as a phenol type and a phosphorus type
  • the amount is sufficient up to about 2 parts by weight with respect to 100 parts by weight of the propylene resin.
  • nucleating agent master batch pellets are added to propylene resins.
  • additives such as ultraviolet absorbers, lubricants, antistatic agents, antiblocking agents, and antifogging agents can be blended within a range that does not impair the effects of the present invention to form a mixed masterbatch.
  • these additives can be used alone in the form of a masterbatch with a propylene resin and added to the base propylene resin.
  • the propylene-based resin film containing a predetermined amount of the nucleating agent used in the present invention is preferably produced by a melt extrusion method.
  • the melt extrusion method is excellent in productivity and excellent in cost.
  • a powder-form or pellet-form propylene-based resin raw material is supplied to an extruder heated to about 180 to 300 ° C., melted and kneaded by an extruder screw, and formed into a sheet form from a slit of a T die. After melt extrusion, the film is produced by bringing it into contact with a cooling roll by various means and cooling.
  • a single-screw or twin-screw extruder It is also preferable to seal the vicinity of the hopper and / or die outlet with nitrogen from the viewpoint of protecting the propylene-based resin from oxidative degradation.
  • the material to be melt-extruded or melt-kneaded to the extruder it is stored in an inert gas environment in which nitrogen having an oxygen concentration of 1% by volume or less is a typical example, and oxygen contained in the material. Replacing the molecule with an inert gas such as a nitrogen molecule is often effective for suppressing deterioration of the resin.
  • the extruder may be a single screw extruder or a twin screw extruder.
  • L / D which is the ratio of the screw length L to the diameter D
  • the compression ratio which is the ratio (V 1 / V 2 ) to the space volume V 2
  • a screw such as a full flight type, a barrier type, and a type having a Maddock type kneading part is used.
  • a screw having an L / D of 28 to 36 and a compression ratio V 1 / V 2 of 2 to 3.
  • Increasing the resin pressure at the tip of the extruder by installing an orifice means increasing the back pressure at the tip, and this can improve the uniformity of melt-kneading and improve the stability of extrusion There is.
  • the diameter of the orifice used is more preferably 2 to 4 mm ⁇ .
  • the T die used for extrusion a flow channel having a coat hanger shape is used, and the flow rate and pressure of the molten propylene resin are designed to be as uniform and balanced as possible in the width direction of the T die slit portion. It is preferable. Also, it is preferable that the surface of the flow path of the resin does not have a minute step or scratch, and the lip portion may be hard chrome plating, but the fluorine-based or silicone-based impregnated fluorine-based material or silicone-based material It is preferable that the plating surface has a small coefficient of friction with the molten propylene-based resin, such as material-containing plating, or is sprayed with a hard material such as tungsten carbide.
  • the lip portion is preferably polished and has a surface with a surface roughness as flat as 0.1 S or less as much as possible, and has a surface with few irregularities.
  • the lip portion has a sharp edge shape with a lip tip polished to 0.3 mm ⁇ or less. preferable.
  • a gear pump is attached between the extruder and the T die via an adapter to stabilize the pressure and supply the resin to the T die.
  • the pressure at this time is preferably within 0.1 MPa as a fluctuation value.
  • the gear pump is preferably a direct acting type, and it is most preferable to use a gear pump of the type that eliminates the phase for feeding resin with three gears instead of two.
  • a leaf disk filter to remove foreign substances in the propylene resin.
  • the number of leaf disk filters and the filtration area per sheet can be arbitrarily selected depending on the viscosity and extrusion amount (flow rate) of the molten propylene resin and the heat resistance of the resin.
  • the amount of foreign matter in the film can be reduced by using a filter having a foreign matter collection rate of 98% or more and a foreign matter size of 10 ⁇ m or less. It is preferable because the quality as a film can be improved.
  • the filtration accuracy is more preferably 5 ⁇ m or less, and most preferably 3 ⁇ m or less.
  • the leaf disk filter is preferably installed in the order of the extruder, the gear pump, the leaf disk filter, and the T die from the viewpoint that stable foreign matter removal is possible.
  • the molten film-like propylene-based resin extruded from the T-die is subsequently cooled by coming into contact with a metal cooling roll (also referred to as a chill roll or a casting roll) and closely contacting the cooling roll.
  • a metal cooling roll also referred to as a chill roll or a casting roll
  • the adhesion method to the cooling roll may affect the transparency.
  • the adhesion to the cooling roll is, for example, a) a method in which static electricity is imparted to the molten sheet-like propylene resin and the surface state is adhered to the cooling roll having a mirror surface, and b) a molten sheet-like propylene resin.
  • a method in which a cooling roll having a mirror surface and a metal roll (also referred to as a touch roll) or a metal belt having a mirror surface having a mirror surface is sandwiched between the cooling roll and closely contacting the cooling roll to cool the sheet, and c) a molten sheet
  • a known method such as a method in which the propylene-based resin is cooled by being brought into close contact with the cooling roll by the air blown from the air chamber.
  • the method of a) is a method sometimes referred to as an electrostatic pinning method, and only the both end portions (sometimes referred to as ear portions) of a film-like product of a molten propylene resin extruded from a T die, or A core-like, thread-like or belt-like power source is installed on the front side in the width direction of the film-like material, a high voltage is applied to the molten propylene resin using a high-frequency power source, static electricity is charged, and the cooling roll is used. It is the method of making it contact and cooling and solidifying.
  • the surface of the roll is preferably 0.5S or less in surface roughness.
  • the surface material may be a conductive material such as hard chrome plating or tungsten carbide spraying, but is preferably a spraying surface such as chromium oxide that does not conduct electricity.
  • the method of b) is a method called touch roll molding, in which a molten propylene-based resin film-like material extruded from a T-die is sandwiched between a cooling roll and an elastically deformable metal roll or metal belt.
  • the film is brought into close contact with a cooling roll, and the film is cooled and solidified to obtain a film having excellent transparency.
  • An elastically deformable metal roll has a roll surface with a thickness of 5 mm or less, and a resin pool (sometimes referred to as a bank) when a molten propylene-based resin is sandwiched between cooling rolls.
  • a metal roll that is clamped without making, and a metal belt is a metal endless belt having a thickness of 1 mm or less, supported by a rubber roll or a metal roll, moved, and a film of molten propylene resin between the cooling roll The object is clamped.
  • This method is preferable from the viewpoint of easily increasing the molding speed when using a crystalline resin whose transparency is impaired depending on cooling conditions.
  • each surface has a surface roughness of 0.3 S or less.
  • the film since the film is made of a molten propylene-based resin in some cases, it may be too close to the cooling roll or the elastically deformable metal roll or metal belt surface, resulting in poor roll separation. There is also.
  • silicone-based materials or fluorine-based materials are used, or a sprayed surface such as chromium oxide or tungsten carbide or its sealing is used.
  • a treated surface is also preferred.
  • the method of c) is a method called “air chamber method”.
  • air chamber method When the film-like product of the molten propylene resin extruded from the T-die is brought into contact with the cooling roll, it is melted from the opposite side of the cooling roll. Air is blown onto the film-like material of the propylene-based resin by an air chamber, thereby causing the film-like material of the molten propylene-based resin to adhere to the cooling roll.
  • the air chamber a commercially available appropriate one can be used without particular limitation.
  • the air to be blown is sucked through a high performance air filter (HEPA filter: High Efficiency Particulate Air Filter) with a blower or the like.
  • HEPA filter High Efficiency Particulate Air Filter
  • the air chamber is preferably in a pressurized state of 50 to 500 Pa. If the pressure in the air chamber is within this range, the air pressure applied to the film will be moderate. Therefore, the distance between the lip of the T die and the molten sheet-shaped resin contacting the cooling roll (air gap) will fluctuate. This makes it possible to form a stable film, and naturally the stability such as the thickness accuracy of the film is improved. For this reason, it is more preferable that the pressure in the air chamber is 100 to 400 Pa.
  • the surface state of the cooling roll in the method c) tends to be transferred to the propylene-based resin film, it is not as much as in the method a) or b), and is a mirror-state cooling roll. Is used, there is no escape from the air entrained between the film of the molten propylene-based resin and the cooling roll, and uniform molding becomes difficult. Therefore, in the case of the method c), a cooling roll having a surface roughness of about 0.6 to 4S is used. From the viewpoint of improving the uniformity of the film surface, about 0.8 to 2S is preferable.
  • the surface temperature of the cooling roll in the methods a) to c) is adjusted in the range of 30 to 120 ° C., for example.
  • the molten sheet-like propylene-based resin extruded from the above-mentioned T-die generally has a thickness of about 0.5 to 2.0 mm and is in contact with the cooling roll (air gap). It is gradually extended and thinned, and after contacting the cooling roll, it is extended to a predetermined thickness while being rapidly cooled.
  • the propylene-based resin used in the present invention has a nucleating agent added thereto, whereby the molten sheet-like propylene-based resin has a high crystallization speed, so the surface temperature of the cooling roll is not optimal, For example, when the temperature is too low, crystallization occurs radically at the time of contact with the cooling roll, so that it is considered that the expansion of the molten sheet-like propylene resin is insufficient. Further, when the temperature is too high, the propylene-based resin is not cooled and solidified, so that it may not be separated from the cooling roll and may be undesirably wound or may be deformed when leaving.
  • the optimum surface temperature of the cooling roll is 40 in order to avoid the above trouble. It is preferable to select between ⁇ 100 ° C.
  • the processing speed when producing a propylene-based resin film is about 10 to 100 m / min.
  • the transparency index When the processing speed is high, the transparency tends to deteriorate from the viewpoint of uneven cooling.
  • the total haze value measured according to JIS K7136 is adopted as the transparency index, the total haze value is preferably 10% or less, and more preferably 6% or less.
  • the total light transmittance at the time of internal haze measurement measured according to JIS K7136 described above that is, the total light transmittance in a state in which reflection and diffusion on the film surface are virtually eliminated.
  • the total light transmittance is preferably 98% or more, more preferably 99% or more, and particularly preferably 99.5% or more.
  • the total light transmittance in a state in which reflection and diffusion on the latter film surface are virtually eliminated. If this total light transmittance is small, there is a possibility that the luminance will be lowered when incorporated in a liquid crystal television or the like.
  • the thickness of the propylene-based resin film in the polarizing plate of the present invention is preferably about 5 to 200 ⁇ m. More preferably, it is 10 ⁇ m or more and 150 ⁇ m or less.
  • the propylene-based resin film used in the present invention can be subjected to a surface treatment such as a corona treatment or a plasma treatment as long as the effects of the present invention are not impaired. Further, an antireflection layer, a hard coat layer, or the like may be provided on the surface by a technique such as coating.
  • the transparent resin film is also bonded by the surface on the opposite side to which the propylene-type resin film of the polarizing film mentioned above was bonded.
  • a transparent resin film bonded to the surface opposite to the one where such a propylene-based resin film is bonded an in-plane retardation and a thickness-direction retardation are within a specific range, respectively.
  • a retardation film made of is preferable.
  • the norbornene resin film here is a film made of a thermoplastic resin having a monomer unit made of a cyclic olefin (cycloolefin) such as norbornene or a polycyclic norbornene monomer.
  • the norbornene-based resin film can be a hydrogenated product of the ring-opening polymer of the cycloolefin or a ring-opening copolymer using two or more kinds of cycloolefin, and has a cycloolefin and a cyclic olefin or a vinyl group.
  • An addition copolymer with an aromatic compound or the like may be used.
  • a polar group may be introduced.
  • examples of the chain olefin include ethylene and propylene
  • examples of the aromatic compound having a vinyl group include styrene
  • the monomer unit composed of cycloolefin may be 50 mol% or less (preferably 15 to 50 mol%).
  • the amount of the monomer unit composed of the cycloolefin can be made relatively small as described above.
  • the unit of monomer comprising a chain olefin is usually 5 to 80 mol%
  • the unit of monomer comprising an aromatic compound having a vinyl group is usually 5 to 80 mol%.
  • Cycloolefin-based resins are commercially available as appropriate, for example, TOPAS (Topas Advanced Polymers GmbH), Arton (manufactured by JSR Corporation), ZEONOR (ZEON Corporation), ZEONEX (ZEONEX Japan) (Made by Mitsui Chemical Co., Ltd.) etc. can be used conveniently.
  • TOPAS Topas Advanced Polymers GmbH
  • Arton manufactured by JSR Corporation
  • ZEONOR ZeroNOR
  • ZEONEX ZEONEX Japan
  • ZEONEX Japan Mide by Mitsui Chemical Co., Ltd.
  • escina manufactured by Sekisui Chemical Co., Ltd.
  • SCA40 manufactured by Sekisui Chemical Co., Ltd.
  • zeonoa film manufactured by Nippon Zeon Co., Ltd.
  • arton film manufactured by JSR Co., Ltd.
  • this norbornene-based resin film has an in-plane retardation value R 0 in the range of 40 to 100 nm, more preferably 40 to 80 nm, and a thickness direction retardation value R th of 80 to 250 nm, more preferably 100 to 100 nm. It is preferably in the range of 250 nm.
  • the in-plane retardation value R 0 and the thickness direction retardation value R th of the birefringent film are the refractive index in the in-plane slow axis direction of the film, n x , and the direction (advanced in the plane perpendicular to the slow axis).
  • the refractive index in the direction of the phase axis) is defined as n y , the refractive index in the thickness direction as n z , and the thickness of the film as d.
  • R 0 (n x -n y ) ⁇ d
  • Rth [( nx + ny ) / 2- nz ] * d
  • the stretching ratio and stretching speed are adjusted appropriately, and various temperatures such as preheating temperature, stretching temperature, heat set temperature, and cooling temperature during stretching are used. And the change pattern thereof may be appropriately selected.
  • a refractive index characteristic can be obtained by stretching under relatively loose conditions.
  • the stretching ratio is preferably in the range of 1.05 to 1.6 times, and more preferably 1.1 to 1. More preferably, it is 5 times.
  • the stretching ratio in the maximum stretching direction may be in the above range.
  • the thickness of the stretched norbornene-based resin film used in the present invention is not particularly limited, but is preferably in the range of 20 to 80 ⁇ m, and more preferably in the range of 40 to 80 ⁇ m. This is because when the thickness of the norbornene-based resin film is less than 20 ⁇ m, it is difficult to handle the film and it is difficult to express a predetermined retardation value. On the other hand, the thickness of the norbornene-based resin film is 80 ⁇ m. When exceeding, it will become inferior to workability, there exists a possibility that transparency may fall or the weight of the obtained polarizing plate may become large.
  • a polypropylene resin film and, for example, the above-described norbornene-based resin film are bonded to both surfaces of the above-described polarizing film via an adhesive.
  • the same type of adhesive may be used for the resin film bonded to both surfaces of the polarizing film, or different types of adhesive may be used.
  • a preferable adhesive from the viewpoint of thinning the adhesive layer includes an aqueous adhesive, that is, an adhesive component dissolved in water or dispersed in water.
  • a photo-curable adhesive that is cured by light itself can be used.
  • the photocurable adhesive examples include a mixture of a photocurable epoxy resin and a photocationic polymerization initiator. A combination of this adhesive and a propylene-based resin film to which a specific ultraviolet absorber is added is most preferable in terms of adhesive strength.
  • This photocurable adhesive is cured by irradiation with active energy rays.
  • the light source of the active energy ray is not particularly limited, but an active energy ray having a light emission distribution at a wavelength of 400 nm or less is preferable.
  • a microwave excitation mercury lamp, a metal halide lamp and the like are preferable.
  • a method of laminating the above-mentioned transparent resin film on the polarizing film generally known methods may be used, for example, Mayer bar coating method, gravure coating method, comma coater method, doctor blade method, die coating method, dip coating.
  • coating an adhesive agent to the adhesive surface of a polarizing film and / or the film bonded there by the method, the spraying method, etc., and superimposing both is mentioned.
  • the gravure coating method or the die coating method is preferable from the viewpoint of the thickness accuracy of the coating film, the coating thickness, the size of equipment, and the like, and the gravure coating method is more preferable from the same viewpoint.
  • the gravure coating method is a coating method that uses a selected gravure roll in consideration of the coating amount, and a chamber is installed at a position surrounding the gravure roll that rotates in the opposite direction to the flow direction of the film to be coated. It is the method of apply
  • the surface of the polarizing film and / or transparent resin film to which the adhesive is applied is appropriately subjected to surface treatment such as plasma treatment, corona treatment, ultraviolet irradiation treatment, flame (flame) treatment, saponification treatment, etc. in order to increase adhesion. May be.
  • surface treatment such as plasma treatment, corona treatment, ultraviolet irradiation treatment, flame (flame) treatment, saponification treatment, etc.
  • saponification treatment include a method of immersing in an aqueous alkali solution such as sodium hydroxide or potassium hydroxide.
  • the thickness of the adhesive layer can be 0.1 ⁇ m or less.
  • the adhesive when a photocurable adhesive is used, the adhesive is cured by irradiation with active energy rays, and the polarizing film and the transparent resin films on both sides are adhered.
  • the thickness of the adhesive layer is usually 0.5 to 5 ⁇ m, preferably 1 to 4 ⁇ m, and more preferably 1.5 to 4 ⁇ m.
  • the thickness of the adhesive layer is less than 0.5 ⁇ m, the adhesion may be insufficient, and when the thickness of the adhesive layer exceeds 5 ⁇ m, the appearance of the polarizing plate may be poor.
  • the polarizing plate of this invention may have the adhesive layer laminated
  • This pressure-sensitive adhesive layer can be suitably used, for example, for bonding with a liquid crystal cell when the polarizing plate is applied to a liquid crystal display device.
  • the adhesive layer is usually It is provided on a norbornene-based resin film.
  • a conventionally well-known appropriate adhesive can be used for an adhesive layer without a restriction
  • an acrylic pressure-sensitive adhesive is preferably used from the viewpoints of transparency, adhesive strength, reliability, reworkability, and the like.
  • the pressure-sensitive adhesive layer can be provided by a method in which a solution containing a pressure-sensitive adhesive is applied to a norbornene-based resin film with a die coater or a gravure coater and dried, and a plastic film that has been subjected to a release treatment (called a separate film) )
  • the pressure-sensitive adhesive layer formed thereon can also be provided by a method of transferring to a norbornene-based resin film.
  • the thickness of the pressure-sensitive adhesive layer is preferably in the range of 2 to 40 ⁇ m.
  • the polarizing plate of the present invention can be suitably applied to a liquid crystal display device.
  • the polarizing plate of the present invention is preferably disposed on the back side of the liquid crystal panel via an adhesive layer.
  • the polarizing plate of this invention is arrange
  • liquid crystal display device regarding the portions other than the above-described features, an appropriate configuration in a conventionally known liquid crystal display device can be adopted, and the constituent members (light diffusing plate, backlight) that the liquid crystal display device normally includes other than the liquid crystal panel Etc.) can be provided as appropriate.
  • the “rear side” of the liquid crystal panel means the backlight side when the liquid crystal panel is mounted on the liquid crystal display device, while the “front side” of the liquid crystal panel mounts the liquid crystal panel on the liquid crystal display device. It means the viewer side.
  • the total haze of the film was measured using a haze meter HM150 manufactured by Murakami Color Research Laboratory Co., Ltd., which conforms to JIS K7136: 2000 “Plastics—How to Obtain Haze of Transparent Materials”. Moreover, the total light transmittance was measured using the same haze meter in the state which immersed the film in the quartz cell filled with dimethyl phthalate. The state in which the film is immersed in a quartz cell filled with dimethyl phthalate corresponds to a state in which the internal haze of the film is measured, that is, the reflection and diffusion of the film surface are virtually eliminated.
  • the polarizing plate is cut into 200 mm ⁇ 300 mm (short side is the absorption axis of the polarizing plate), bonded to soda glass via an adhesive, put into an oven at 80 ° C. and kept for 100 hours, and then glass and polarized light. Whether or not peeling occurred between the plates was observed and evaluated according to the following criteria.
  • ⁇ There is no peeling of the polarizing plate from the glass surface or even if it is smaller than 1 mm.
  • X The peeling of the polarizing plate from the glass surface is 1 mm or more.
  • Example 1 A propylene / ethylene copolymer having an ethylene content of 0.4% and an MFR of 9 g / 10 min was added to a trisamide nucleating agent N, N ′, N ′′ -tris (2-methylcyclohexyl) -propane-1. , 2,3-tricarboxamide [having a structure of the above formula (10), obtained from Shin Nippon Rika Co., Ltd.] was melt-kneaded in a 50 mm ⁇ extruder heated to 275 ° C. Next, it was extruded in a molten state from a T-die having a width of 600 mm, and cooled with a cooling roll whose temperature was adjusted to 50 ° C.
  • a photocurable adhesive containing a photocurable epoxy resin and a photocationic polymerization initiator is applied to the corona-treated surface at a thickness of 4 ⁇ m. Worked.
  • the corona treatment was performed on one side of a norbornene-based resin film that was biaxially stretched and had a thickness of 50 ⁇ m, an in-plane retardation value R 0 of 55 nm, and a thickness direction retardation value R th of 124 nm, the corona treatment The same photo-curable adhesive as above was applied to the surface with a thickness of 4 ⁇ m.
  • an adhesive layer of the propylene resin film is bonded to one surface of a polarizing film in which iodine is adsorbed and oriented to polyvinyl alcohol, and an adhesive layer of the norbornene resin film is bonded to the other surface. And pressed with a pair of nip rolls of 100 mm ⁇ . Thereafter, ultraviolet rays were irradiated from the norbornene-based resin film side to cure both adhesive layers to produce a polarizing plate. When the durability of the polarizing plate thus obtained was evaluated by the method shown above, no peeling was observed between the glass surface and the polarizing plate.
  • the polarizing film used here had a single-piece transmittance of 42.3% by itself, but the single-piece transmittance when the above resin films were bonded to both sides to form a polarizing plate was 41.9%. Thus, the amount of decrease (difference) in single transmittance (%) when the polarizing plate was obtained was 0.4 points.
  • the value obtained by subtracting the single transmittance (unit:%) when the polarizing film itself is used from the single transmittance of the polarizing film itself is the amount of decrease in the single transmittance (%) when the polarizing film is used. In Table 1, it is indicated by the item name “amount of decrease in transmittance (%)”.
  • Example 2 A propylene-based resin film was produced in the same manner as in Example 1 except that the blending amount of the nucleating agent was changed to 1000 ppm.
  • the physical properties of the resulting propylene-based resin film are summarized in Table 1. Moreover, there was no problem in processing characteristics when the film in this example was formed.
  • a polarizing plate was produced in the same manner as in Example 1 except that the propylene-based resin film obtained here was used, and the durability was evaluated. As a result, no peeling was observed between the glass surface and the polarizing plate. Table 1 shows the amount of decrease in single transmittance (%) when the polarizing plate is used.
  • Example 3 The nucleating agent was changed to a carboxylic acid metal salt-based nucleating agent calcium cyclohexane-1,2-dicarboxylate (obtained from MILKEN CHEMICAL, USA, having the structure of the above formula (2)), and the amount was changed.
  • a propylene-based resin film was produced in the same manner as in Example 1 except that the concentration was 1000 ppm.
  • the physical properties of the resulting propylene-based resin film are summarized in Table 1. The adhesion with the cooling roll was good in the visible range, but when passing through the cooling roll, some unevenness was observed on the surface of the central portion in the width direction (adhesion was not good in the unknown range) ).
  • a polarizing plate was produced in the same manner as in Example 1 except that the propylene-based resin film obtained here was used, and the durability was evaluated. As a result, no peeling was observed between the glass surface and the polarizing plate. Table 1 shows the amount of decrease in single transmittance (%) when the polarizing plate is used.
  • Example 4 A propylene-based resin film was produced in the same manner as in Example 3 except that the blending amount of the nucleating agent was 3000 ppm.
  • the physical properties of the resulting propylene-based resin film are summarized in Table 1.
  • the adhesion with the cooling roll was good in the visible range, but when passing through the cooling roll, some unevenness was observed on the surface of the central portion in the width direction (adhesion was not good in the unknown range) ).
  • a polarizing plate was produced in the same manner as in Example 1 except that the propylene-based resin film obtained here was used, and the durability was evaluated. As a result, no peeling was observed between the glass surface and the polarizing plate.
  • Table 1 shows the amount of decrease in single transmittance (%) when the polarizing plate is used.
  • Example 5 A propylene-based resin film was produced in the same manner as in Example 3 except that the blending amount of the nucleating agent was 5000 ppm.
  • the physical properties of the resulting propylene-based resin film are summarized in Table 1.
  • the adhesion with the cooling roll was good in the visible range, but when passing through the cooling roll, some unevenness was observed on the surface of the central portion in the width direction (adhesion was not good in the unknown range) ).
  • a polarizing plate was produced in the same manner as in Example 1 except that the propylene-based resin film obtained here was used, and the durability was evaluated. As a result, no peeling was observed between the glass surface and the polarizing plate.
  • Table 1 shows the amount of decrease in single transmittance (%) when the polarizing plate is used.
  • the nucleating agent is 1-O, 3-O; 2-O, 4-O-bis (4-propylbenzylidene) -1-propyl-D-sorbitol [formula (8), which is a sorbitol nucleating agent.
  • the propylene-based resin film was produced in the same manner as in Example 1 except that the structure was changed to “MILKEN CHEMICAL, USA” and the amount was changed to 3000 ppm.
  • the physical properties of the resulting propylene-based resin film are summarized in Table 1. There was no problem in processing characteristics when the film was formed.
  • a polarizing plate was produced in the same manner as in Example 1 except that the propylene-based resin film obtained here was used, and the durability was evaluated. As a result, no peeling was observed between the glass surface and the polarizing plate. Table 1 shows the amount of decrease in single transmittance (%) when the polarizing plate is used.
  • Example 7 A propylene-based resin film was produced in the same manner as in Example 6 except that the blending amount of the nucleating agent was 5000 ppm.
  • the physical properties of the resulting propylene-based resin film are summarized in Table 1. There was no problem in processing characteristics when the film was formed.
  • a polarizing plate was produced in the same manner as in Example 1 except that the propylene-based resin film obtained here was used, and the durability was evaluated. As a result, no peeling was observed between the glass surface and the polarizing plate. Table 1 shows the amount of decrease in single transmittance (%) when the polarizing plate is used.
  • the nucleating agent is a phosphoric acid ester metal salt nucleating agent [phosphoric acid ⁇ 2,2′-methylenebis (4,6-di-tert-butylphenyl) ⁇ ] sodium [the structure of the above formula (3)
  • the propylene-based resin film was produced in the same manner as in Example 1 except that the amount was changed to 2000 ppm, and the amount was changed to 2000 ppm.
  • the physical properties of the resulting propylene-based resin film are summarized in Table 1.
  • the adhesion with the cooling roll was good in the visible range, but when passing through the cooling roll, some unevenness was observed on the surface of the central portion in the width direction (adhesion was not good in the unknown range) ).
  • a polarizing plate was produced in the same manner as in Example 1 except that the propylene-based resin film obtained here was used, and the durability was evaluated. As a result, no peeling was observed between the glass surface and the polarizing plate. Table 1 shows the amount of decrease in single transmittance (%) when the polarizing plate is used.
  • Example 1 A propylene resin film was produced in the same manner as in Example 1 except that no nucleating agent was added to the propylene resin.
  • the physical properties of the resulting propylene-based resin film are summarized in Table 1. There was no problem in processing characteristics when the film was formed. Except using the propylene-type resin film obtained here, the polarizing plate was produced similarly to Example 1 and durability was evaluated, and 1.1 mm peeling occurred between the glass surface and the polarizing plate. . Table 1 shows the amount of decrease in single transmittance (%) when the polarizing plate is used.
  • Example 9 The same procedure as in Example 1 was conducted except that the amount of N, N ′, N ′′ -tris (2-methylcyclohexyl) -propane-1,2,3-tricarboxamide, which is a trisamide nucleating agent, was changed to 100 ppm. Then, a propylene-based resin film was produced, and a polarizing plate was produced in the same manner as in Example 1 using the propylene-based resin film. There was no problem in processing characteristics when forming a propylene-based resin film. The physical properties of the propylene-based resin film, the durability test results of the polarizing plate, and the amount of decrease in the single transmittance (%) when the polarizing plate is obtained are summarized in Table 2 in the same manner as in Table 1.
  • Example 10 A propylene-based resin film was prepared in the same manner as in Example 3 except that the compounding amount of the carboxylic acid metal salt-based nucleating agent calcium cyclohexane-1,2-dicarboxylate was changed to 100 ppm.
  • a polarizing plate was produced in the same manner as in Example 3 using the film. There was no problem in processing characteristics when forming a propylene-based resin film.
  • the physical properties of the propylene-based resin film, the durability test results of the polarizing plate, and the amount of decrease in the single transmittance (%) when the polarizing plate is obtained are summarized in Table 2 in the same manner as in Table 1.
  • the resulting propylene-based resin film has a small total haze, and the tensile modulus at 80 ° C. is also 200 MPa or more. Therefore, the polarizing plate to which the rigidity is applied is excellent in durability.
  • the propylene-based resin film has a total light transmittance slightly less than 100% in a state where reflection and diffusion on the surface are eliminated, and the amount of decrease in the single transmittance (%) when it is made a polarizing plate is slightly large. Become.
  • the blending amount of the nucleating agent is 250 ppm or less, the resulting propylene-based resin film has a slightly increased total haze, but the tensile modulus at 80 ° C. is 200 MPa or more. Rigidity is imparted, and the polarizing plate to which it is applied has excellent durability.
  • the propylene-based resin film has a total light transmittance of approximately 100% in a state where reflection and diffusion on the surface are eliminated, and the amount of decrease in the single transmittance (%) when the polarizing plate is made is further reduced.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Polarising Elements (AREA)
  • Manufacture Of Macromolecular Shaped Articles (AREA)
  • Liquid Crystal (AREA)
  • Compositions Of Macromolecular Compounds (AREA)
  • Laminated Bodies (AREA)

Abstract

La présente invention concerne une plaque polarisante dans laquelle des films de résine transparente sont, chacun en ce qui le concerne, liés aux deux faces d'un film polarisant en résine d'alcool polyvinylique, un film adhésif étant intercalé entre chaque film de résine transparente et chaque face du film polarisant. L'un au moins des films en résine transparente est un film en résine de propylène qui contient un agent de nucléation présent à raison de 50 à 6.000 ppm. L'un des films en résine transparente liés aux deux faces du film polarisant est de préférence le film fait de ladite résine de propylène, l'autre film en résine transparente étant de préférence un film en résine de norbornène.
PCT/JP2012/058784 2011-03-31 2012-03-27 Plaque polarisante WO2012133876A1 (fr)

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JP2013101335A (ja) * 2011-10-21 2013-05-23 Sumitomo Chemical Co Ltd 偏光板の製造方法

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JP5570329B2 (ja) * 2010-07-08 2014-08-13 サン・トックス株式会社 保護フィルム及びその製造方法
JP6800046B2 (ja) * 2017-02-24 2020-12-16 花王株式会社 メルトブロー不織布の製造方法

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