Patents by Inventor Nao Murakami
Nao Murakami has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 8937146Abstract: The polycarbonate resin of the present invention comprises a structural unit derived from a dihydroxy compound represented by a specific formula (1), a structural unit derived from a dihydroxy compound represented by a specific formula (2), and a structural unit derived from a dihydroxy compound represented by any one of specific formulae (3) to (6), wherein the content of structural units derived from dihydroxy compounds represented by the specific formulae (3) to (6) is within a specific range based on the total of structural units derived from dihydroxy compounds in the polycarbonate resin.Type: GrantFiled: November 12, 2013Date of Patent: January 20, 2015Assignees: Mitsubishi Chemical Corporation, Nitto Denko CorporationInventors: Masashi Yokogi, Shingo Namiki, Tomohiko Tanaka, Nao Murakami
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Patent number: 8907044Abstract: The polycarbonate resin of the present invention comprises a structural unit derived from a dihydroxy compound represented by a specific formula (1), a structural unit derived from a dihydroxy compound represented by a specific formula (2), and a structural unit derived from a dihydroxy compound represented by any one of specific formulae (3) to (6), wherein the content of structural units derived from dihydroxy compounds represented by the specific formulae (3) to (6) is within a specific range based on the total of structural units derived from dihydroxy compounds in the polycarbonate resin.Type: GrantFiled: November 12, 2013Date of Patent: December 9, 2014Assignees: Mitsubishi Chemical Corporation, Nitto Denko CorporationInventors: Masashi Yokogi, Shingo Namiki, Tomohiko Tanaka, Nao Murakami
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Patent number: 8900656Abstract: A method for producing an optical film including a birefringent layer having a refractive index distribution satisfying nx>nz>ny that can be produced by a small number of steps, contains less foreign matter trapped therein, and has high productivity. The method includes steps of: forming a coating film by directly applying a material for forming a birefringent layer on the shrinkable film; shrinking the coating film in a first direction by shrinking the shrinkable film; and stretching a laminate of the shrinkable film and the coating film in a second direction orthogonal to the first direction, wherein the material for forming a birefringent layer contains at least one resin selected from norbornene resins, polycarbonate resins, cellulose resins, polyamides, and polyurethanes, and wherein the birefringent layer has a refractive index distribution satisfying nx>nz>ny. An optical film produced by the method.Type: GrantFiled: June 11, 2010Date of Patent: December 2, 2014Assignee: Nitto Denko CorporationInventors: Motoko Kawasaki, Toshiyuki Iida, Nao Murakami, Hiroyuki Yoshimi
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Publication number: 20140327963Abstract: The present invention provides a method of producing a retardation film excellent in stretchability and capable of achieving high alignment property. The method of producing a retardation film of the present invention is the method in which a lengthy resin film is stretched in a widthwise direction thereof while being conveyed in a lengthwise direction thereof to provide a retardation film satisfying a relationship of 0.70<Re(450)/Re(550)<0.97, including: a preheating step of heating the resin film to a temperature T1; a preliminary stretching step of stretching the resin film after the preheating while cooling the film to a temperature T2; and a main stretching step.Type: ApplicationFiled: July 24, 2013Publication date: November 6, 2014Applicant: NITTO DENKO CORPORATIONInventors: Toshiyuki Iida, Takashi Shimizu, Nao Murakami, Kazuki Uwada, Tadashi Kojima
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Publication number: 20140285888Abstract: A retardation film insusceptible to color dropout or color shift even under environment of severe temperature or humidity conditions and capable of being produced by a melt film-forming method. The retardation film is obtained by molding at least one polymer selected from polycarbonate and polyester carbonate each having a glass transition temperature of 110 to 180° C. and satisfies the relationships of the following formulae (A) and (B): 0.7<R1(450)/R1(550)<1??Formula (A): |R2(450)/R2(550)?R1(450)/R1(550)|<0.020.Type: ApplicationFiled: March 14, 2014Publication date: September 25, 2014Applicants: NITTO DENKO CORPORATION, MITSUBISHI CHEMICAL CORPORATIONInventors: Tomohiko TANAKA, Masashi YOKOGI, Shingo NAMIKI, Yuuichi HIRAMI, Masanori YAMAMOTO, Nao MURAKAMI, Toshiyuki IIDA, Takashi SHIMIZU
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Publication number: 20140268333Abstract: An object of the present invention is to provide a retardation film succeeded in solving those conventional problems, that is, a retardation film insusceptible to color dropout or color shift even under environment of severe temperature or humidity conditions and capable of being produced by a melt film-forming method. The retardation film of the present invention satisfies the relationships of the following formulae (A) and (B): 0.7<R1(450)/R1(550)<1??Formula (A): |R2(450)/R2(550)?R1(450)/R1(550)|<0.Type: ApplicationFiled: March 14, 2014Publication date: September 18, 2014Applicants: NITTO DENKO CORPORATION, MITSUBISHI CHEMICAL CORPORATIONInventors: Tomohiko TANAKA, Masashi Yokogi, Nao Murakami, Toshiyuki IIDA
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Publication number: 20140268334Abstract: 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.Type: ApplicationFiled: May 30, 2014Publication date: September 18, 2014Applicants: MITSUBISH CHEMICAL CORPORATION, NITTO DENKO CORPORATIONInventors: Tomohiko TANAKA, Masashi YOKOGI, Nao MURAKAMI, Toshiyuki IIDA
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Publication number: 20140225288Abstract: A method for manufacturing a novel tilt alignment type optical compensation film formed using a non-liquid crystal polymer material, instead of a conventional tilt alignment type optical compensation film using a liquid crystal material. The method for manufacturing including: melting a non-liquid crystal polymer to prepare a molten resin; applying a shear force to the melted non-liquid crystal polymer by a shear force application device, thereby forming a film having an optical axis that tilts with respect to a thickness direction of the film; and stretching the film. The step of forming the film is carried out under conditions where a temperature T3 of the melted non-liquid crystal polymer, a glass transition point Tg of the non-liquid crystal polymer, and a temperature T2 of the shear force application device satisfy relationships represented by the following formulae (A) and (B): T3>Tg+25° C.; and??(A) T3>T2.Type: ApplicationFiled: July 4, 2012Publication date: August 14, 2014Applicants: TOYO KOHAN CO., LTD., NITTO DENKO CORPORATIONInventors: Nobuyuki Haida, Hironori Yaginuma, Nao Murakami, Motoko Kawasaki, Kunihiro Seike, Keigo Ehara, Shogo Yamamoto
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Patent number: 8778486Abstract: 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.Type: GrantFiled: May 17, 2012Date of Patent: July 15, 2014Assignees: Mitsubishi Chemical Corporation, Nitto Denko CorporationInventors: Tomohiko Tanaka, Masashi Yokogi, Nao Murakami, Toshiyuki Iida
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Patent number: 8730434Abstract: An optical compensation film according to an embodiment of the present invention includes: non-liquid crystal polymers arranged in a tilt alignment, wherein the optical compensation film satisfies the following expressions (1) and (2): 3 [nm]?(nx?ny)×d;??(1) and 5°<?,??(2) where, when an X-axis and a Y-axis, which are plane direction axes of a three-dimensional coordinate system, are perpendicular to each other and an axis vertical to the X-axis and the Y-axis in a thickness direction is defined as a Z-axis, nx and ny indicate a maximum refractive index and a minimum refractive index in an XY-plane of the optical compensation film, respectively, d indicates a film thickness [nm], and ? indicates an angle formed between a direction for providing the minimum refractive index ny and a direction for providing a maximum refractive index nb in a YZ-plane of the optical compensation film.Type: GrantFiled: April 7, 2011Date of Patent: May 20, 2014Assignee: Nitto Denko CorporationInventors: Nao Murakami, Motoko Kawasaki, Hiroyuki Yoshimi
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Publication number: 20140073757Abstract: The polycarbonate resin of the present invention comprises a structural unit derived from a dihydroxy compound represented by a specific formula (1), a structural unit derived from a dihydroxy compound represented by a specific formula (2), and a structural unit derived from a dihydroxy compound represented by any one of specific formulae (3) to (6), wherein the content of structural units derived from dihydroxy compounds represented by the specific formulae (3) to (6) is within a specific range based on the total of structural units derived from dihydroxy compounds in the polycarbonate resin.Type: ApplicationFiled: November 12, 2013Publication date: March 13, 2014Applicants: NITTO DENKO CORPORATION, MITSUBISHI CHEMICAL CORPORATIONInventors: Masashi YOKOGI, Shingo NAMIKI, Tomohiko TANAKA, Nao MURAKAMI
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Liquid crystal cell substrate, liquid crystal cell, liquid crystal panel, and liquid crystal display
Patent number: 8665404Abstract: The present invention provides a liquid crystal cell substrate, a liquid crystal panel, and a liquid crystal display whose thicknesses and weights can be reduced and optical characteristics at the time of producing them are easily controlled. The liquid crystal cell substrate 10 of the present invention is a liquid crystal cell substrate including a resin substrate 11 and an optical compensation layer 12, and the optical compensation layer 12 is laminated on the resin substrate 11. The optical compensation layer 12 has a refractive index distribution satisfying nx?ny>nz, and the optical compensation layer 12 is formed by applying a material for forming an optical compensation layer to the resin substrate 11 or a base substrate that is different from the resin substrate 11.Type: GrantFiled: October 29, 2008Date of Patent: March 4, 2014Assignee: Nitto Denko CorporationInventors: Nao Murakami, Hiroyuki Yoshimi -
Publication number: 20130249378Abstract: A retardation film which comprises a stretched polymer film and satisfies the following formulae (1) to (3): 0.70<Re[450]/Re[550]<0.97??(1); 1.5×10?3<?n<6×10?3??(2); and 1.13<NZ<1.50??(3), wherein: Re[450] and Re[550] represent in-plane retardation values of the retardation film as measured at 23° C. using light with a wavelength of 450 nm and light with a wavelength of 550 nm, respectively; ?n represents an in-plane birefringence equal to (nx?ny) (where nx and ny represent refractive indexes in a slow axis direction and a fast axis direction of the retardation film, respectively); and NZ represents a ratio of a thickness-direction birefringence equal to (nx?nz) (where nz represents a refractive index in a thickness direction of the retardation film) to the in-plane birefringence equal to (nx?ny).Type: ApplicationFiled: December 6, 2011Publication date: September 26, 2013Applicant: NITTO DENKO CORPORATIONInventors: Nao Murakami, Takashi Shimizu
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Patent number: 8531630Abstract: There is provided a liquid crystal display panel having a high contrast ratio in a front direction. A liquid crystal panel of the present invention includes: a liquid crystal cell; a first polarizing plate placed on one side of the liquid crystal cell; and a second polarizing plate placed on another side of the liquid crystal cell. A transmittance (T1) of the first polarizing plate is higher than a transmittance (T2) of the second polarizing plate. Preferably, a difference (?T=T1?T2) between the transmittance (T1) of the first polarizing plate and the transmittance (T2) of the second polarizing plate is 0.1% to 6.0%.Type: GrantFiled: June 22, 2007Date of Patent: September 10, 2013Assignee: Nitto Denko CorporationInventors: Takashi Shimizu, Kentarou Yoshida, Naotaka Kinjo, Nao Murakami
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Patent number: 8493527Abstract: The liquid crystal panel according to an embodiment of the present invention includes a liquid crystal cell, a first polarizing plate placed on one side of the liquid crystal cell, a second polarizing plate and a third polarizing plate placed on the other side of the liquid crystal cell in an order starting from a side of the liquid crystal cell, and a retardation plate (A) placed between the liquid crystal cell and the second polarizing plate, wherein a refractive index ellipsoid of the retardation plate (A) has a relationship of nx?ny>nz, a difference (?T2?1=T2?T1) between a transmittance (T2) of the second polarizing plate and a transmittance (T1) of the first polarizing plate is larger than 0%, a difference (?T3?2=T3?T2) between a transmittance (T3) of the third polarizing plate and a transmittance (T2) of the second polarizing plate is 4.0% to 7.5%, and the third polarizing plate is a linearly polarized light separation type reflective polarizing plate.Type: GrantFiled: June 23, 2009Date of Patent: July 23, 2013Assignee: Nitto Denko CorporationInventors: Takaaki Ishii, Masatsugu Higashi, Nao Murakami
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Patent number: 8355102Abstract: There is provided a liquid crystal panel exhibiting a high contrast ratio and a liquid crystal display apparatus including the liquid crystal panel. The liquid crystal panel of the present invention includes a first polarizer, a first optical compensation layer, a liquid crystal cell, a second optical compensation layer, and a second polarizer in the stated order from a viewer side. The first optical compensation layer and the second optical compensation layer have a refractive index profile of nx>ny>nz, and a light transmittance (T2) of the second polarizer is larger than a light transmittance (T1) of the first polarizer.Type: GrantFiled: April 23, 2008Date of Patent: January 15, 2013Assignee: Nitto Denko CorporationInventors: Takeharu Kitagawa, Kentarou Takeda, Nao Murakami, Hiroyuki Yoshimi
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Publication number: 20120308796Abstract: 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.Type: ApplicationFiled: May 17, 2012Publication date: December 6, 2012Applicants: NITTO DENKO CORPORATION, MITSUBISHI CHEMICAL CORPORATIONInventors: Tomohiko Tanaka, Masashi Yokogi, Nao Murakami, Toshiyuki Iida
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Patent number: 8274624Abstract: The present invention provides a liquid crystal panel that can provide a neutral display that is free from coloring in every direction. The liquid crystal panel includes a first polarizer 14a, a second polarizer 14b, and a liquid crystal cell 13. The first polarizer 14a is arranged on the visible side of the liquid crystal cell 13 and the second polarizer 14b is arranged on the backlight side of the liquid crystal cell 13. The liquid crystal panel further includes a first retardation layer 11 and a second retardation layer 12. A refractive index ellipsoid of the first retardation layer 11 has a relationship of nx=ny>nz, and a refractive index ellipsoid of the second retardation layer 12 has a relationship of nx>ny?nz. The first retardation layer 11 and the second retardation layer 12 are arranged between the liquid crystal cell 13 and the second polarizer 14b.Type: GrantFiled: May 27, 2008Date of Patent: September 25, 2012Assignee: Nitto Denko CorporationInventors: Takeharu Kitagawa, Daisuke Hayashi, Hideki Ishida, Takeshi Nishibe, Nao Murakami
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Patent number: 8269928Abstract: The present invention provides a polarizing plate that includes: a transparent protective film; a polarizer; and an optical compensation layer. The transparent protective film, the polarizer, and the optical compensation layer are laminated in this order. A moisture percentage of the polarizing plate is 2.8% by mass or less. The optical compensation layer includes a retardation film. The retardation film includes at least one resin selected from the group consisting of norbornene resins, cellulose resins, polyvinyl acetal resins, polyimide resins, polyester resins, and polycarbonate resins. The optical compensation layer shows an optical property represented by the following formula (I): nx>ny>nz??(I).Type: GrantFiled: April 7, 2010Date of Patent: September 18, 2012Assignee: Nitto Denko CorporationInventors: Masatsugu Higashi, Takashi Kumano, Kazuki Uwada, Nao Murakami
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Publication number: 20120231255Abstract: A polycarbonate resin film of the present invention is formed from a polycarbonate resin which contains at least a constitutional unit derived from a dihydroxy compound having a bonded structure represented by the following structural formula (1) and satisfies the following expression (2) when subjected to a tensile test at a standard stretching temperature for the polycarbonate resin and at a pulling speed (strain rate) of 1,000%/min. [Chem. 1] ?CH2—O???(1) (No hydrogen atom is bonded to the oxygen atom contained in the structural formula (1).) 0.Type: ApplicationFiled: May 18, 2012Publication date: September 13, 2012Applicants: NITTO DENKO CORPORATION, MITSUBISHI CHEMICAL CORPORATIONInventors: Tomohiko Tanaka, Michiaki Fuji, Nao Murakami, Takashi Shimizu