Patents by Inventor Masashi Osawa
Masashi Osawa 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).
-
Patent number: 10544365Abstract: A liquid crystal composition that has a positive dielectric anisotropy and a sufficiently low viscosity and that causes no display defects when used in liquid crystal display devices is provided without decreasing or increasing the refractive index anisotropy or nematic phase-isotropic liquid phase transition temperature. This liquid crystal composition contains at least one compound selected from compounds represented by general formula (LC0) and at least one compound selected from the group consisting of compounds represented by general formulas (LC1) to (LC5). This liquid crystal composition can be used to provide a reliable liquid crystal display device capable of maintaining a high voltage-holding ratio at high temperatures. This liquid crystal display device is highly practical as a liquid crystal display and is effective in achieving quick response without significantly decreasing the cell gap.Type: GrantFiled: August 21, 2014Date of Patent: January 28, 2020Assignee: DIC CORPORATIONInventors: Masakazu Kaneoya, Kiyofumi Takeuchi, Masashi Osawa, Kenta Tojo, Tetsuo Kusumoto
-
Patent number: 9605208Abstract: A liquid crystal composition exhibits a positive dielectric anisotropy and sufficiently low viscosity without decreasing or increasing refractive index anisotropy or nematic phase-isotropic liquid phase transition temperature, and does not cause display failures. The liquid crystal composition contains one or more compounds selected from compounds represented by general formula (LC0) and one or more compounds selected from a group of compounds represented by general formula (LC1) to general formula (LC5), in which the liquid crystal composition contains one or more compounds in which at least one of A01, A02, and A11 to A42 in general formulae (LC0) to (LC4) represents a tetrahydropyran-2,5-diyl group.Type: GrantFiled: July 24, 2013Date of Patent: March 28, 2017Assignee: DIC CORPORATIONInventors: Masakazu Kaneoya, Kiyofumi Takeuchi, Masashi Osawa, Kenta Tojo, Tetsuo Kusumoto
-
Patent number: 9587175Abstract: The present invention relates to a nematic liquid crystal composition useful as an electro-optic liquid crystal display material and having a positive dielectric anisotropy (??). The liquid crystal composition has refractive index anisotropy (?n) adjusted to a desired level, a sufficiently low viscosity (?), and a positive dielectric anisotropy (??) while degradation of the temperature range of the nematic phase is avoided by suppressing the decrease in nematic phase-isotropic liquid phase transition temperature (Tni) and the increase in lower limit temperature of the nematic phase. The liquid crystal composition contains one or more compounds selected from compounds represented by general formula (LC0) and one or more compounds selected from a group of compounds represented by general formula (LC1) to general formula (LC5).Type: GrantFiled: July 24, 2013Date of Patent: March 7, 2017Assignee: DIC CORPORATIONInventors: Masakazu Kaneoya, Kiyofumi Takeuchi, Masashi Osawa, Kenta Tojo, Tetsuo Kusumoto
-
Publication number: 20160186059Abstract: A liquid crystal composition that has a positive dielectric anisotropy and a sufficiently low viscosity and that causes no display defects when used in liquid crystal display devices is provided without decreasing or increasing the refractive index anisotropy or nematic phase-isotropic liquid phase transition temperature. This liquid crystal composition contains at least one compound selected from compounds represented by general formula (LC0) and at least one compound selected from the group consisting of compounds represented by general formulas (LC1) to (LC5). This liquid crystal composition can be used to provide a reliable liquid crystal display device capable of maintaining a high voltage-holding ratio at high temperatures. This liquid crystal display device is highly practical as a liquid crystal display and is effective in achieving quick response without significantly decreasing the cell gap.Type: ApplicationFiled: August 21, 2014Publication date: June 30, 2016Applicant: DIC CorporationInventors: Masakazu Kaneoya, Kiyofumi Takeuchi, Masashi Osawa, Kenta Tojo, Tetsuo Kusumoto
-
Patent number: 9321961Abstract: Provided is a liquid crystal composition having a positive dielectric anisotropy, the liquid crystal composition containing two or more compounds selected from compounds represented by general formula (LC0-1) to general formula (LC0-3), and one or more compounds selected from groups of compounds represented by general formula (LC1) to general formula (LC5). The liquid crystal composition has features of a large ?? and a low viscosity, and provides a practical, highly reliable liquid crystal display element that can realize low-voltage driving and high-speed response. The liquid crystal composition is useful for an active matrix driving liquid crystal display element. The liquid crystal composition can be applied to a liquid crystal display element of an IPS mode or the like.Type: GrantFiled: August 29, 2013Date of Patent: April 26, 2016Assignee: DIC CORPORATION (TOKYO)Inventors: Masakazu Kaneoya, Kiyofumi Takeuchi, Masashi Osawa, Kenta Tojo, Tetsuo Kusumoto
-
Publication number: 20150322343Abstract: Provided is a liquid crystal composition that has a positive dielectric anisotropy (??) and a refractive index anisotropy (?n) adjusted to a desired level, and sufficiently low viscosity (?) without degrading the nematic phase temperature range. The liquid crystal composition having positive dielectric anisotropy comprises one or more compounds selected from compounds represented by general formula (LC0) and one or more compounds selected from the group of compounds represented by general formula (LC1) to general formula (LC5), wherein the liquid crystal composition comprises a compound in which at least one of Y01 to Y41 in general formula (LC0) to general formula (LC4) represents a fluorinated C2-C5 alkyl, alkoxy, alkenyl, or alkenyloxy group.Type: ApplicationFiled: September 5, 2013Publication date: November 12, 2015Applicant: DIC CORPORATIONInventors: Masakazu Kaneoya, Kiyofumi Takeuchi, Masashi Osawa, Kenta Tojo, Tetsuo Kusumoto
-
Patent number: 9181484Abstract: There is provided a compound having a good miscibility with another liquid crystal compound and having a combination of a low viscosity (?), high storage stability, and high T?i even after being used to produce a liquid crystal composition. In particular, it is a compound having a 2-fluorophenyloxymethane structure is provided. Since the compound having a 2-fluorophenyloxymethane structure is highly miscible with another liquid crystal compound, using the compound having a 2-fluorophenyloxymethane structure as a component of a liquid crystal composition enables a production of a liquid crystal composition which exhibits a liquid crystal phase at low viscosity and in a wide temperature range and which has a high storage stability and enables production of a liquid crystal display device which responds fast and which has excellent display characteristics.Type: GrantFiled: April 24, 2013Date of Patent: November 10, 2015Assignee: DIC CORPORATIONInventors: Kenta Tojo, Tetsuo Kusumoto, Masashi Osawa, Masakazu Kaneoya, Kiyofumi Takeuchi
-
Publication number: 20150284634Abstract: A liquid crystal composition having positive dielectric anisotropy and sufficiently low viscosity without decreasing refractive index anisotropy or increasing nematic phase-isotropic liquid phase transition temperature, and prevents display failures is provided. The liquid crystal composition comprises one or more compounds selected from compounds represented by general formula (LC0) and one or more compounds selected from the group of compounds represented by general formula (LC1) to general formula (LC5), wherein the liquid crystal composition comprises one or more compounds in which at least one of A21 to A42 in general formula (LC2) to general formula (LC4) represents a tetrahydropyran-2,5-diyl group.Type: ApplicationFiled: September 5, 2013Publication date: October 8, 2015Applicant: DIC CorporationInventors: Masakazu Kaneoya, Kiyofumi Takeuchi, Masashi Osawa, Kenta Tojo, Tetsuo Kusumoto
-
Publication number: 20150218451Abstract: Provided is a liquid crystal composition having a positive dielectric anisotropy, the liquid crystal composition containing two or more compounds selected from compounds represented by general formula (LC0-1) to general formula (LC0-3), and one or more compounds selected from groups of compounds represented by general formula (LC1) to general formula (LC5). The liquid crystal composition has features of a large ?? and a low viscosity, and provides a practical, highly reliable liquid crystal display element that can realize low-voltage driving and high-speed response. The liquid crystal composition is useful for an active matrix driving liquid crystal display element. The liquid crystal composition can be applied to a liquid crystal display element of an IPS mode or the like.Type: ApplicationFiled: August 29, 2013Publication date: August 6, 2015Applicant: DIC CORPORATIONInventors: Masakazu Kaneoya, Kiyofumi Takeuchi, Masashi Osawa, Kenta Tojo, Tetsuo Kusumoto
-
Publication number: 20150203757Abstract: The present invention relates to a nematic liquid crystal composition useful as an electro-optic liquid crystal display material and having a positive dielectric anisotropy (??). The liquid crystal composition has refractive index anisotropy (?n) adjusted to a desired level, a sufficiently low viscosity (?), and a positive dielectric anisotropy (??) while degradation of the temperature range of the nematic phase is avoided by suppressing the decrease in nematic phase-isotropic liquid phase transition temperature (Tni) and the increase in lower limit temperature of the nematic phase. The liquid crystal composition contains one or more compounds selected from compounds represented by general formula (LC0) and one or more compounds selected from a group of compounds represented by general formula (LC1) to general formula (LC5).Type: ApplicationFiled: July 24, 2013Publication date: July 23, 2015Applicant: DIC CORPORATIONInventors: Masakazu Kaneoya, Kiyofumi Takeuchi, Masashi Osawa, Kenta Tojo, Tetsuo Kusumoto
-
Publication number: 20150184076Abstract: A liquid crystal composition exhibits a positive dielectric anisotropy and sufficiently low viscosity without decreasing or increasing refractive index anisotropy or nematic phase-isotropic liquid phase transition temperature, and does not cause display failures. The liquid crystal composition contains one or more compounds selected from compounds represented by general formula (LC0) and one or more compounds selected from a group of compounds represented by general formula (LC1) to general formula (LC5), in which the liquid crystal composition contains one or more compounds in which at least one of A01, A02, and A11 to A42 in general formulae (LC0) to (LC4) represents a tetrahydropyran-2,5-diyl group.Type: ApplicationFiled: July 24, 2013Publication date: July 2, 2015Applicant: DIC CORPORATIONInventors: Masakazu Kaneoya, Kiyofumi Takeuchi, Masashi Osawa, Kenta Tojo, Tetsuo Kusumoto
-
Publication number: 20150159086Abstract: The nematic liquid crystal composition according to the present invention is used for, for example, producing a liquid crystal display element used in TN mode, OCB mode, ECB mode, IPS mode, or VA-IPS mode. The liquid crystal composition has a positive dielectric anisotropy and allows reductions in refractive-index anisotropy and nematic phase-isotropic liquid phase transition temperature and an increase in the lower limit temperature of a nematic phase to be suppressed. As a result, the liquid crystal composition has a sufficiently low viscosity without deteriorating the temperature range of a nematic phase. The liquid crystal composition allows high-speed response and high display quality to be realized, suppresses faulty display, and is suitably used as a practical liquid crystal composition.Type: ApplicationFiled: March 13, 2013Publication date: June 11, 2015Applicant: DIC CORPORATIONInventors: Masakazu Kaneoya, Kiyofumi Takeuchi, Masashi Osawa, Kenta Tojyo, Tetsuo Kusumoto
-
Patent number: 9039929Abstract: A nematic liquid crystal composition of the present invention is used in liquid crystal display devices of the TN mode, OCB mode, ECB mode, IPS mode, or VA-IPS mode. The liquid crystal composition has positive dielectric anisotropy. Since the refractive index anisotropy and the nematic phase-isotropic liquid phase transition temperature are decreased and the increase in the lower limit temperature of the nematic phase is suppressed, the viscosity of the liquid crystal composition is sufficiently low without degrading the nematic phase temperature range. The liquid crystal composition also offers excellent features such as high-speed response, good display quality, and less display failures and is thus suitable as a practical liquid crystal composition.Type: GrantFiled: July 31, 2012Date of Patent: May 26, 2015Assignee: DIC CORPORATIONInventors: Masakazu Kaneoya, Kiyofumi Takeuchi, Masashi Osawa, Kenta Tojo, Tetsuo Kusumoto
-
Publication number: 20150087847Abstract: There is provided a compound having a good miscibility with another liquid crystal compound and having a combination of a low viscosity (?), high storage stability, and high T?i even after being used to produce a liquid crystal composition. In particular, it is a compound having a 2-fluorophenyloxymethane structure is provided. Since the compound having a 2-fluorophenyloxymethane structure is highly miscible with another liquid crystal compound, using the compound having a 2-fluorophenyloxymethane structure as a component of a liquid crystal composition enables a production of a liquid crystal composition which exhibits a liquid crystal phase at low viscosity and in a wide temperature range and which has a high storage stability and enables production of a liquid crystal display device which responds fast and which has excellent display characteristics.Type: ApplicationFiled: March 24, 2013Publication date: March 26, 2015Applicant: DIC CORPORATIONInventors: Kenta Tojo, Tetsuo Kusumoto, Masashi Osawa, Masakazu Kaneoya, Kiyofumi Takeuchi
-
Patent number: 8916718Abstract: The present invention relates to a compound having a 2-fluorophenyloxymethane structure and useful for organic electronic materials and medical and agricultural chemicals, particularly materials for liquid crystal display elements. A problem to be solved by the invention is to provide a compound having relatively large ??, relatively high T?i, low viscosity (?), and high miscibility with other liquid crystal compounds, and also provide a liquid crystal composition containing the compound as a constituent component. The present invention provides a compound having a 2-fluorophenyloxymethane structure and also provides a liquid crystal composition containing the compound and a liquid crystal display device using the liquid crystal composition.Type: GrantFiled: May 22, 2012Date of Patent: December 23, 2014Assignee: DIC CorporationInventors: Kenta Tojo, Kiyofumi Takeuchi, Masashi Osawa, Masakazu Kaneoya, Tetsuo Kusumoto
-
Publication number: 20140275577Abstract: The present invention relates to a compound having a 2-fluorophenyloxymethane structure and useful for organic electronic materials and medical and agricultural chemicals, particularly materials for liquid crystal display elements. A problem to be solved by the invention is to provide a compound having relatively large ??, relatively high T?i, low viscosity (?), and high miscibility with other liquid crystal compounds, and also provide a liquid crystal composition containing the compound as a constituent component. The present invention provides a compound having a 2-fluorophenyloxymethane structure and also provides a liquid crystal composition containing the compound and a liquid crystal display device using the liquid crystal composition.Type: ApplicationFiled: May 22, 2012Publication date: September 18, 2014Applicant: DIC CORPORATIONInventors: Kenta Tojo, Kiyofumi Takeuchi, Masashi Osawa, Masakazu Kaneoya, Tetsuo Kusumoto
-
Publication number: 20140225036Abstract: A nematic liquid crystal composition of the present invention is used in liquid crystal display devices of the TN mode, OCB mode, ECB mode, IPS mode, or VA-IPS mode. The liquid crystal composition has positive dielectric anisotropy. Since the refractive index anisotropy and the nematic phase-isotropic liquid phase transition temperature are decreased and the increase in the lower limit temperature of the nematic phase is suppressed, the viscosity of the liquid crystal composition is sufficiently low without degrading the nematic phase temperature range. The liquid crystal composition also offers excellent features such as high-speed response, good display quality, and less display failures and is thus suitable as a practical liquid crystal composition.Type: ApplicationFiled: July 31, 2012Publication date: August 14, 2014Applicant: DIC CORPORATIONInventors: Masakazu Kaneoya, Kiyofumi Takeuchi, Masashi Osawa, Kenta Tojo, Tetsuo Kusumoto
-
Patent number: 7145047Abstract: Disclosed in a novel liquid-crystalline compound which is a naphthalene derivative useful as an electro-optical liquid crystal display material, a liquid crystal composition containing such naphthalene derivatives and a liquid crystal display device comprising the same. The naphthalene derivative provided by the present invention exhibits an excellent liquid-crystallinity and miscibility with currently widely used liquid crystal compositions or compositions. The addition of the naphthalene derivative makes it possible to drastically lower the threshold voltage of the liquid crystal composition while maintaining its high response. The naphthalene derivative of the present invention is characterized by a large birefringence index. Further, most of the naphthalene derivative of the present invention has no strongly polar group in its molecule and thus can also be used for active matrix driving.Type: GrantFiled: August 21, 2002Date of Patent: December 5, 2006Assignee: Dainippon Ink and Chemicals, Inc.Inventors: Sadao Takehara, Masashi Osawa, Haruyoshi Takatsu, Makoto Negishi
-
Patent number: 6693223Abstract: A novel liquid crystal compound, a nematic liquid crystal composition, and a liquid crystal display system using the composition are disclosed herein. The liquid crystal compound is represented by the general formula (I): wherein R represents a hydrogen atom or a straight chain alkyl group having 1 to 7 carbon atoms and each of X, Y and Z independently represents hydrogen atom or fluorine atom. The nematic liquid crystal composition of the present invention can provide liquid crystal materials in response to desired purposes even by its addition in a small amount without spoiling other characteristics.Type: GrantFiled: February 27, 2003Date of Patent: February 17, 2004Assignee: Dainippon Ink and Chemicals, Inc.Inventors: Kiyofumi Takeuchi, Haruyoshi Takatsu, Sadao Takehara, Masashi Osawa
-
Patent number: 6607791Abstract: A liquid crystal composition comprises as a first liquid crystal component a compound represented by the following general formula (I): and as a second liquid crystal component a compound selected from the group consisting of compounds represented by the following general formulae (II) and (III): and has a nematic phase upper temperature limit of 75° C. or higher and &Dgr;n of from 0.07 to 0.18.Type: GrantFiled: October 27, 2000Date of Patent: August 19, 2003Assignee: Dainippon Ink and Chemicals, Inc.Inventors: Shinji Ogawa, Masashi Osawa, Hiroyuki Ohnishi, Haruyoshi Takatsu, Kiyofumi Takeuchi, Shotaro Kawakami, Takeshi Kuriyama