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33results about How to "Low photoelastic coefficient" patented technology
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Fluorophosphate optical glass
ActiveCN105016619AIncrease refractionLow photoelastic coefficientOptical elementsGratingPhotoelasticity
An optical glass, having a refractive index nd which is greater than 1.59, an abbe number υd which is greater than 67, a low photoelastic coefficient and good chemical stability and grinding performance. The fluorophosphate optical glass contains, by cation percentage contents: P5+: 30％-40％, Al3+: 12％-20％, Ba2+: 30％-40％, Ca2+: 1.3％-12％, Sr2+: 1％-10％, La3+: 0％-5％, Gd3+: 0％-6％, Y3+: 0％-10％ and contains, by anion percentage contents: F+: 25%-40％, O2-: 60%-75％. The optical glass is applicable to manufacturing methods such as precision moulding, secondary hot-press forming and cold processing, and to manufacturing optical elements such as a high-performance spherical, aspheric and planar lens and a prism and an optical grating.
Owner:CDGM OPTICAL GLASS
Polycarbonate resin and transparent film formed therefrom
ActiveUS20120308796A1Low photoelastic coefficientModerate glass transition temperatureSynthetic resin layered productsPolarising elementsStructural unitPhotochemistry
The polycarbonate resin of the invention includes a first structural unit derived from a dihydroxy compound represented by a general formula (1), a second structural unit derived from a dihydroxy compound represented by a general formula (2), and a third structural unit derived from at least one dihydroxy compound selected from the group consisting of a dihydroxy compound represented by a general formula (3), a dihydroxy compound represented by a general formula (4), a dihydroxy compound represented by a general formula (5), and a dihydroxy compound represented by a general formula (6), and in which the first structural unit derived from a dihydroxy compound represented by the general formula (1) accounts for 18% by mole or more of the polycarbonate resin. The above general formulae (1) to (6) are described in the specification of the present application.
Owner:MITSUBISHI CHEM CORP +1
Polycarbonate resin and optical film using the same
ActiveUS20100196720A1Low in photo elastic coefficientLow photoelastic coefficientSynthetic resin layered productsPolarising elementsPolycarbonateChemistry
According to the present invention, a polycarbonate resin having a repeat unit represented by the following formula (1) and a repeat unit represented by the following general formula (2), and an optical film using the same, can be provided.In the formula, Y is a cycloalkylene group having a carbon number of 4 through 20 or a structure represented by the following general formula (3).In the general formula (3), R1, R2, R3 and R4 are independently a hydrogen atom or a monovalent alkyl group having a carbon number of 1 through 5.
Owner:MITSUBISHI GAS CHEM CO INC
Polyester resin composition, production method thereof and laminate polyester film
ActiveUS20100178524A1Low in coefficientLow refractive indexSynthetic resin layered productsAntimony organic compoundsForeign matterRefractive index
The present invention is a composition containing a polyester resin containing at least an alicyclic dicarboxylic acid component and an alicyclic diol component, and it is a polyester resin composition which satisfies that a glass transition temperature is 65° C. or more and 90° C. or less, a refractive index at sodium D line is 1.500 or more and 1.570 or less, a titanium element content is 5 ppm or more and 500 ppm or less, a phosphorus element content is 50 ppm or more and 500 ppm or less and a gel fraction is 50% or less. By the present invention, it is possible to obtain a polyester resin composition having a low refractive index and photoelastic coefficient, and in which a thermally degraded foreign substance is reduced.
Owner:TORAY IND INC
Polarizing plate
InactiveCN1413304ALow photoelastic coefficientIncreased durabilityPolarising elementsThin material handlingPolarizerSecondary layer
A polarizing plate which is substantially free from a decrease in the degree of polarization in a high-humidity high-temperature atmosphere, a hue change, and light leakage. The polarizing plate comprises a polarizing film based on polyvinyl alcohol and the following protective film which consists mainly of a cycloolefin resin, has the following anchoring agent coating comprising two layers, and is superposed on at least one side of the polarizing film with the following adhesive. The protective film has an optical in-plane phase difference change of 5 nm or less through 24-hr standing at 80 DEG C and had a wetting tension of 500 mu N / cm or higher (23 DEG C) on the side to be anchor-coated. The anchoring agent coating comprises a first layer formed from a polyisocyanate and a polyester polyol and / or polyether polyol and a second layer made of polyvinyl alcohol. The adhesive comprises polyvinyl alcohol.
Owner:GUNZE LTD +1
Polycarbonate resin and method for producing the same
ActiveCN101679623AWith transparencyHeat resistantPolarising elementsThin material handlingArylHalogen
The present invention can provide a polycarbonate resin containing a structural unit represented by the following formula (1). In the formula (1), R represents one selected from an alkyl group having1 to 9 carbon atoms, an aryl group having 6 to 12 carbon atoms, an alkenyl group having 2 to 5 carbon atoms, an alkoxy group having 1 to 5 carbon atoms, an aralkyl group having 7 to 17 carbon atoms, and halogen; and n represents the number of substituting R's on a benzene ring and is an integer of 0 to 4. Y represents an alkylene group having 1 to 4 carbon atoms; and p is an integer of 0 to 4.
Owner:MITSUBISHI GAS CHEM CO INC
Polycarbonate resin and transparent film formed therefrom
InactiveUS20140268334A1Low photoelastic coefficientModerate glass transition temperaturePolarising elementsThin material handlingStructural unitPhotochemistry
The polycarbonate resin of the invention includes a first structural unit derived from a dihydroxy compound represented by a general formula (1), a second structural unit derived from a dihydroxy compound represented by a general formula (2), and a third structural unit derived from at least one dihydroxy compound selected from the group consisting of a dihydroxy compound represented by a general formula (3), a dihydroxy compound represented by a general formula (4), a dihydroxy compound represented by a general formula (5), and a dihydroxy compound represented by a general formula (6), and in which the first structural unit derived from a dihydroxy compound represented by the general formula (1) accounts for 18% by mole or more of the polycarbonate resin. The above general formulae (1) to (6) are described in the specification of the present application.
Owner:MITSUBISHI CHEM CORP +1
Polycarbonate resin and transparent film formed therefrom
ActiveUS8778486B2Low photoelastic coefficientModerate glass transition temperatureSynthetic resin layered productsPolarising elementsStructural unitPhotochemistry
The polycarbonate resin of the invention includes a first structural unit derived from a dihydroxy compound represented by a general formula (1), a second structural unit derived from a dihydroxy compound represented by a general formula (2), and a third structural unit derived from at least one dihydroxy compound selected from the group consisting of a dihydroxy compound represented by a general formula (3), a dihydroxy compound represented by a general formula (4), a dihydroxy compound represented by a general formula (5), and a dihydroxy compound represented by a general formula (6), and in which the first structural unit derived from a dihydroxy compound represented by the general formula (1) accounts for 18% by mole or more of the polycarbonate resin. The above general formulae (1) to (6) are described in the specification of the present application.
Owner:MITSUBISHI CHEM CORP +1
Active energy beam-cured composition for optical film, optical film, polarizer protective film, and polarizing plate
InactiveCN104024294ALower latencyExcellent heat and humidity resistancePolarising elementsNon-linear opticsMethacrylateMeth-
[Problem] To provide: an active energy beam-curable composition for optical films that combines a low photoelastic coefficient and low retardation, good resistance to moist heat, and outstanding flexibility; an optical film obtained using said composition; a polarizer protective film; and a polarizing plate. [Solution] An energy beam-curable composition for forming optical films, containing: (A) urethane (meth)acrylate (A) having a photoelastic coefficient at 23°C when cured (hereinafter merely referred to as the "photoelastic coefficient") not exceeding 30 x 10-12Pa-1, and (B) a polymer other than the component (A) and which has a photoelastic coefficient not exceeding 5 x 10-12Pa-1. The photoelastic coefficient when cured does not exceed 10 x 10-12Pa-1, in-plane retardation at the front and at a diagonal of 40° and total retardation in the thickness direction when cured as measured at a thickness of 40mum does not exceed 5nm.
Owner:TOAGOSEI CO LTD
Liquid crystal panel and liquid crystal display apparatus
ActiveCN1794056AThe display effect is uniformImprove display uniformityTelevision system detailsPolarising elementsColor shiftPolarizer
There is provided a liquid crystal panel having an improved contrast ratio in an oblique direction and an improved color shift in an oblique direction. Further, there is provided a liquid crystal panel with excellent display uniformity. The liquid crystal panel of the present invention includes: a liquid crystal cell; a first polarizer arranged on one side of the liquid crystal cell; a second polarizer arranged on the other side of the liquid crystal cell; a first optical element and a second optical element arranged between the first polarizer and the liquid crystal cell; and a third optical element arranged between the second polarizer and the liquid crystal cell, in which: the first optical element has substantially optically negative uniaxial property; the second optical element satisfies the following expressions (1) and (2) and is arranged between the first optical element and the liquid crystal cell; and the third optical element has substantially optical isotr.
Owner:NITTO DENKO CORP
(meth)acrylic resin
A (meth)acrylic resin comprising a (meth)acrylic resin, wherein the (meth)acrylic resin has a repeating unit represented by formula (I) (wherein R1 and R2 independently represent a hydrogen atom or an alkyl group having 1 to 8 carbon atoms; and R3 represents a ring structure) and a repeating unit represented by formula (II) (wherein R4 and R5 independently represent a hydrogen atom or an alkyl group having 1 to 8 carbon atoms; and R6 represents an alkyl group having 1 to 18 carbon atoms, a cycloalkyl group having 3 to 12 carbon atoms, or an aryl group having 6 to 10 carbon atoms).
Owner:NIPPON SHOKUBAI CO LTD
Optical film, and preparation method
InactiveCN1959440AAvoid harmSolve the problem of optical property variationOptical elementsSolventHeat treated
A method for preparing optical film includes mixing PMMA mixture with solvent uniformly to form a wet film, heating said wet film to form an optical dried film, enabling to mix PMMA mixture in any ratio as per required property with solvent to form a mixed solution then carrying out heat treatment on mixed solution to obtain optical film.
Owner:OPTIMAX TECHNOLOGY CORPORATION
Liquid crystal panel and liquid crystal display apparatus
ActiveCN1834751AIncrease contrastAvoid unevennessPolarising elementsNon-linear opticsNorbornenePolarizer
A liquid crystal panel having improved contrast ratio in an oblique direction and good display evenness without causing shift or unevenness in retardation values due to shrinkage stress of a polarizer or heat of backlight is provided. A liquid crystal panel according to an embodiment of the present invention includes: a liquid crystal cell; a polarizer arranged on both sides of the liquid crystal cell; a first optical element arranged between one polarizer and the liquid crystal cell; and a second optical element arranged between the other polarizer and the liquid crystal cell, wherein: the first optical element comprises a retardation film containing a norbornene-based resin and satisfying the following expressions (1) and (2); and the second optical element has substantially optical isotro.
Owner:NITTO DENKO CORP
Resin composition and film formed from same
ActiveCN108137913AExcellent surface hardnessLow photoelastic coefficientHeat resistanceAcrylic resin
Provided is a resin composition which contains a polycarbonate resin (A) having main repeating units that include a unit (a-1) represented by formula (a-1) and a unit (a-2) represented by formula (a-2) (wherein W represents an alkylene group having 1-20 carbon atoms or a cycloalkylene group having 6-20 carbon atoms; R represents a branched or linear alkyl group having 1-20 carbon atoms or an optionally substituted cycloalkyl group having 6-20 carbon atoms; and m represents an integer of 0-10) and an acrylic resin (B), and wherein the weight ratio of the polycarbonate resin to the acrylic resinis from 40:60 to 99:1. This resin composition exhibits a single glass transition temperature within the range from 90 DEG C to 150 DEG C, and has excellent transparency, chemical resistance, surfacehardness and heat resistance, while having low photoelastic coefficient.
Owner:TEIJIN LTD
Laminated phase-difference film
InactiveCN101251614AHigh transparencyImprove heat resistanceLayered productsPolarising elementsLiquid-crystal displayHeat resistance
The invention provides a laminated phase difference film with good transparency, heat resistance and mechanical property, good wavelength disperse property and small photo-elastic coefficient, and a laminated phase difference film capable of implementing good contrast and wide visible angle in a liquid crystal display. A laminated phase difference film is characterized by that the laminated phase difference film is composed of film A and film B are adhered with delay phase shafts thereof vertical to each other and meets the following formulas (1) to (4); wherein, the film A is formed by directional extension of a polymer with positive photo-elastic coefficient, while the film B is formed by directional extension of a polymer with negative photo-elastic coefficient; beta is no more than 20*10<-12>Pa<-1> (1); dA+dB is no less than 50mum but no more than 180mum (2); R(550) is no less than R(450) but no more than R(650) (4).
Owner:TEIJIN KASEK KK
Retardation film and a liquid-crystal display device comprising the same
ActiveUS20110211144A1Low photoelastic coefficientExcellent optical propertiesSynthetic resin layered productsOptical articlesPolymer chemistryCrystal display
The present invention relates to a retardation film that comprises a blend resin of 1) an acryl-based copolymer resin that comprises an alkyl methacrylate-based monomer and a cycloalkyl methacrylate-based monomer, and 2) a resin that comprises an aromatic ring or aliphatic ring in a polymer main chain, a method for manufacturing the retardation film, and a liquid crystal display device that comprises the retardation film. The retardation film according to the present invention has excellent heat resistance, optical transparency, mechanical strength, and durability.
Owner:LG CHEM LTD
Mixed resin, retardation film and a liquid-crystal display device comprising the same
ActiveCN106939111AExcellent optical propertiesGood optical clarityNon-linear opticsOptical elementsOptical transparencyLiquid-crystal display
The present invention relates to mixed resin for a retardation film, a retardation film and a liquid-crystal display device comprising the same, the mixed resin comprising: 1) a copolymer resin comprising 70-99.9wt% of an alkyl methacrylate and 0.1-30wt% of a cycloalkyl methacrylate; and 2) polycarbonate-based resin comprising an aromatic ring or an aliphatic ring on the polymer main chain. The retardation film according to the present invention has outstanding properties including heat resistance, optical transparency, mechanical strength and durability.
Owner:LG CHEM LTD
Double-refraction optical film, elliptic polarizing piece using same and liquid crystal display using said polarizing piece
InactiveCN100454112CLow photoelastic coefficientPolarising elementsNon-linear opticsLiquid-crystal displayPolymer science
The present invention provides a birefringent optical film having a high orientation for easily obtaining a desired retardation value and also a small photoelastic coefficient. The birefringent optical film includes at least two kinds of polymer materials. A total of products of Cn and Wn satisfies a numerical formula (1): Sigma(CnxWn)<=20X10<-8 >cm<2> / N (1) where Cn and Wn denote respectively a photoelastic coefficient and a volume fraction of each polymer material, and at least one of the polymer materials of the film has a photoelastic coefficient value of at least 60x10<-8 >cm<2> / N, while at least one of the remaining polymer materials has a negative value of photoelastic coefficient.
Owner:NITTO DENKO CORP
Resin composition, stretched film, circularly polarizing plate, and image display device
ActiveUS9518150B2Excellent optical propertiesIncreased latitudeOrganic compound preparationCarboxylic acid esters preparationPolymer chemistryCarbon atom
The invention relates to a resin composition which comprises a polymer having a divalent oligofluorene as a repeating unit therein, wherein the divalent oligofluorene contains at least two fluorene units optionally having a substituent, and the 9-positioned carbon atoms of the fluorene units bond to each other via a direct bond or via an alkylene group optionally having a substituent, an arylene group optionally having a substituent, or an aralkylene group optionally having a substituent, and a ratio of a retardation measured at a wavelength of 450 nm (Re450) to a retardation measured at a wavelength of 550 nm (Re550) satisfies the following formula (2): Re450 / Re550≦1.0.
Owner:MITSUBISHI CHEM CORP
Retardation film and a liquid-crystal display device comprising the same
ActiveUS9670352B2Low photoelastic coefficientGood optical performanceSynthetic resin layered productsPolarising elementsOptical transparencyLiquid-crystal display
The present invention relates to a retardation film that comprises a blend resin of 1) an acryl-based copolymer resin that comprises an alkyl methacrylate-based monomer and a cycloalkyl methacrylate-based monomer, and 2) a resin that comprises an aromatic ring or aliphatic ring in a polymer main chain, a method for manufacturing the retardation film, and a liquid crystal display device that comprises the retardation film. The retardation film according to the present invention has excellent heat resistance, optical transparency, mechanical strength, and durability.
Owner:LG CHEM LTD
Optical film, retardation film, and polarizing plate
ActiveUS11016232B2Low photoelastic coefficientIncrease resistancePolarising elementsPolymer sciencePolyester resin
Optical films comprising a polyester resin comprising a structural unit (A) of the following formula (1) wherein the content of the structural unit (A) based on the total structural units of the polyester resin is 76 mol % or greater:wherein R1 is a hydrogen atom, CH3, or C2H5; R2 and R3 is each independently a hydrogen atom or CH3; and n is 1, for example, Decahydro-1,4:5,8-dimethanonaphthalene-2-methoxycarbonyl-6(7)-methanol. Retardation films and circularly or elliptically polarizing plates comprising the optical films are also provided.
Owner:MITSUBISHI GAS CHEM CO INC
Thermoplastic acrylic resin, and molded product thereof
ActiveUS8895682B2Improve thermal stabilityImprove heat resistancePolarising elementsMethacrylateAcrylic resin
The present invention provides a thermoplastic acrylic resin of a copolymer comprising 10 to 70% by weight of a repeating unit derived from the particular methacrylate monomer, 5 to 40% by weight of a repeating unit derived from the particular vinyl aromatic monomer, and 20 to 50% by weight of a repeating unit of the particular cyclic acid anhydride, characterized in that a molar ratio (B / A) is within the range of more than 1 to not more than 10, wherein (A) is a content of the repeating unit of the vinyl aromatic monomer and (B) is a content of the repeating unit of the cyclic acid anhydride, and the total amount of remaining monomers to 100 parts by weight of the copolymer is not more than 0.5 part by weight.
Owner:ASAHI KASEI CHEM CORP
Fluorophosphate optical glass
ActiveCN105016619BIncrease refractionLow photoelastic coefficientOptical elementsGratingPhotoelasticity
An optical glass has refractive index nd greater than 1.59, Abbe number υd greater than 67, low photoelastic coefficient, good chemical stability and excellent grinding property. Fluorophosphate optical glass contains, by cation percentage contents, 30-40% of P5+, 12-20% of Al3+, 30-40% of Ba2+, 1.3-12% of Ca2+, 1-10% of Sr2+, 0-5% of La3+, 0-6% of Gd3+, 0-10% of Y3+, and contains, by anion percentage contents, 25-40% of F+ and 60-75% of O2−. The optical glass is applicable to the manufacturing methods such as high precision molding, secondary hot molding and cold working, in order to produce optical elements like high-performance sphere, aspheric surface, plane lens, prism and raster.
Owner:CDGM OPTICAL GLASS
Thermoplastic resin, molded object, and monomer for thermoplastic resin
Provided is a thermoplastic resin which includes a constituent unit represented by general formula (I). [In formula (I), R1 represents a hydrocarbon group having 1-6 carbon atoms, and R2 and R3 each independently represent a hydrogen atom or a methyl group.].
Owner:MITSUBISHI GAS CHEM CO INC
Lc panel and LCD device
InactiveCN100407001CImprove display uniformityLow photoelastic coefficientNon-linear opticsPolarizerEngineering
The present invention provides a liquid crystal panel having improved contrast ratio in an oblique direction and good display evenness without causing shift or unevenness in retardation values due to shrinkage stress of a polarizer or heat of backlight. A liquid crystal panel according to an embodiment of the present invention includes: a liquid crystal cell; a polarizer arranged on both sides of the liquid crystal cell; a first optical element arranged between one polarizer and the liquid crystal cell; and a second optical element arranged between the other polarizer and the liquid crystal cell, wherein: the first optical element comprises a retardation film containing a styrene-based resin and a polycarbonate-based resin and satisfying the following expressions (1) and (2); and the second optical element has substantially optical isotro. 240nm<=Re(590)<=350nm (1); 0.20<=Rth(590) / Re(590)<=0.80 (2).
Owner:NITTO DENKO CORP
(Meth)acrylic resin
A (meth)acrylic resin comprising a (meth)acrylic resin, wherein the (meth)acrylic resin has a repeating unit represented by formula (I) (wherein R1 and R2 independently represent a hydrogen atom or an alkyl group having 1 to 8 carbon atoms; and R3 represents a ring structure) and a repeating unit represented by formula (II) (wherein R4 and R5 independently represent a hydrogen atom or an alkyl group having 1 to 8 carbon atoms; and R6 represents an alkyl group having 1 to 18 carbon atoms, a cycloalkyl group having 3 to 12 carbon atoms, or an aryl group having 6 to 10 carbon atoms).
Owner:NIPPON SHOKUBAI CO LTD
Polyester resin composition, production method thereof and laminate polyester film
ActiveUS9238710B2Low in coefficientLow in indexSynthetic resin layered productsAntimony organic compoundsForeign matterRefractive index
The present invention is a composition containing a polyester resin containing at least an alicyclic dicarboxylic acid component and an alicyclic diol component, and it is a polyester resin composition which satisfies that a glass transition temperature is 65° C. or more and 90° C. or less, a refractive index at sodium D line is 1.500 or more and 1.570 or less, a titanium element content is 5 ppm or more and 500 ppm or less, a phosphorus element content is 50 ppm or more and 500 ppm or less and a gel fraction is 50% or less. By the present invention, it is possible to obtain a polyester resin composition having a low refractive index and photoelastic coefficient, and in which a thermally degraded foreign substance is reduced.
Owner:TORAY IND INC
Double-refraction optical film, elliptic polarizing piece using same, and liquid crystal display using said polarizing piece
InactiveCN100437298CGood orientationLow photoelastic coefficientSynthetic resin layered productsPolarising elementsPolymer scienceLiquid-crystal display
The present invention provides a birefringent optical film having a high orientation for easily obtaining a desired retardation value and also a small photoelastic coefficient. The birefringent optical film includes at least two kinds of polymer materials. A total of products of Cn and Wn satisfies a numerical formula (1): Sigma(CnxWn)<=30X10<-8 >cm<2> / N (1) where Cn and Wn denote respectively a photoelastic coefficient and a volume fraction of each polymer material, and at least one of the polymer materials of the film has a photoelastic coefficient value of at least 60x10<-8 >cm<2> / N.
Owner:NITTO DENKO CORP
Optical film, retardation film, and polarizing plate
ActiveUS20200033523A1Low photoelastic coefficientImprove heat resistancePolarising elementsOptical propertyPhotoelasticity
An object is to provide: an optical film such as a retardation film, the optical film having a low photoelastic coefficient (superior optical characteristics) and being superior in heat resistance and transparency; and a polarizing plate including the film. The optical film contains a polyester resin containing a unit (A) of the following formula (1).
Owner:MITSUBISHI GAS CHEM CO INC
Liquid crystal panel and liquid crystal display apparatus
ActiveCN100407000CIncrease contrastImprove the display effectPolarising elementsNon-linear opticsNorborneneEngineering
A liquid crystal panel having improved contrast ratio in an oblique direction and good display evenness without causing shift or unevenness in retardation values due to shrinkage stress of a polarizer or heat of backlight is provided. A liquid crystal panel according to an embodiment of the present invention includes: a liquid crystal cell; a polarizer arranged on both sides of the liquid crystal cell; a first optical element arranged between one polarizer and the liquid crystal cell; and a second optical element arranged between the other polarizer and the liquid crystal cell, wherein: the first optical element comprises a retardation film containing a norbornene-based resin and satisfying the following expressions (1) and (2); and the second optical element has substantially optical isotro.
Owner:NITTO DENKO CORP
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