Patents by Inventor Atsuhiro Nakahara
Atsuhiro Nakahara 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: 10526430Abstract: A methacrylic resin composition comprises not less than 90% by mass and not more than 100% by mass of a methacrylic resin [A] having: the total content of a structural unit derived from methyl methacrylate of not less than 90% by mass; a molecular weight MA of not less than 30000 and not more than 100000 in terms of polystyrene corresponding to the retention time indicating the value of the maximum strength in a chromatogram obtained by gel permeation chromatography; the area SgA of a region enclosed by an approximate curve obtained by fitting the data of a range indicating the strength of not less than 70% relative to the value of the maximum strength to a Gaussian function by the method of nonlinear least squares and the base line of the chromatogram of 45 to 80% of the area SA enclosed by the chromatogram and its base line; and the ratio MwgA/MngA of a weight average molecular weight MwgA to a number average molecular weight MngA of not less than 1.01 and not more than 1.Type: GrantFiled: June 30, 2015Date of Patent: January 7, 2020Assignee: KURARAY Co., Ltd.Inventors: Atsuhiro Nakahara, Toru Abe, Toru Takahashi, Hiroshi Ozawa
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Patent number: 10407524Abstract: A copolymer comprising a structural unit (I) derived from a phosphonate monomer (1) such as diethyl methacryloyloxymethyl phosphonate and diethyl 2-methacryloyloxyethyl phosphonate, a structural unit (II) derived from a radical polymerizable monomer (2) such as methacrylic acid, acrylic acid, 8-tricyclo[5.2.1.02,6]decanyl methacrylate, and t-butyl methacrylate, and a structural unit (III) derived from methyl methacrylate, the content of phosphorus atoms derived from the phosphonate monomer (1) being not less than 1.0% by mass and less than 2.0% by mass relative to the mass of the copolymer, and a formed article comprising the copolymer.Type: GrantFiled: August 12, 2015Date of Patent: September 10, 2019Assignee: KURARAY Co., Ltd.Inventors: Toru Abe, Atsuhiro Nakahara, Hiroshi Ozawa
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Patent number: 10287380Abstract: Provided are a break-resistant copolymer having high transparency and heat resistance and also having a high tensile strain at break, and a molded article. A copolymer contains 80% by mass to 98% by mass of structural units derived from a methacrylic ester monomer and 2% to 10% by mass of ester structural units derived from a cyclic ketene acetal monomer. The copolymer has a weight average molecular weight of 80,000 or more and a molecular weight distribution of 1.75 to 3.80.Type: GrantFiled: January 7, 2015Date of Patent: May 14, 2019Assignee: KURARAY CO., LTD.Inventors: Atsuhiro Nakahara, Hiroshi Ozawa, Takashi Fukumoto, Nobutaka Hiraoka
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Patent number: 10196510Abstract: A methacrylic resin [1] having a triad syndiotacticity (rr) of not less than 65% and a methacrylic resin [2] having a triad syndiotacticity (rr) of 45 to 58% are melt kneaded in a mass ratio of the methacrylic resin [1]/the methacrylic resin [2] of 40/60 to 70/30, and further melt kneaded preferably with a polycarbonate resin in a ratio of 1 to 10 parts by mass of the polycarbonate resin to the total 100 parts by mass of the methacrylic resin [1] and the methacrylic resin [2] to obtain a methacrylic resin composition.Type: GrantFiled: May 16, 2014Date of Patent: February 5, 2019Assignee: KURARAY Co., Ltd.Inventors: Toru Takahashi, Atsuhiro Nakahara, Hiroshi Ozawa, Toru Abe, Yusaku Nomoto
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Publication number: 20190016839Abstract: (Meth)acrylate polymers are provided which have a narrow molecular weight distribution on a higher molecular weight side and can impart high shear viscosity stability to lubricating oils. A (meth)acrylate polymer (A) includes specific structural units and is such that in a differential molecular weight distribution curve obtained by gel permeation chromatography (GPC) measurement which shows the polystyrene-equivalent molecular weight of the (meth)acrylate polymer (A) normalized so that the intensity of the peak-top polystyrene-equivalent molecular weight M (t) is 1, the value a represented by a=Log Mh (t1/2)?Log M (t) is not more than 0.12 wherein Mh (t1/2) is the polystyrene-equivalent molecular weight at a point on a higher molecular weight side where the intensity is 0.5.Type: ApplicationFiled: January 12, 2017Publication date: January 17, 2019Applicant: KURARAY CO., LTD.Inventors: Fumihiko OKABE, Toru TAKAHASHI, Atsuhiro NAKAHARA
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Patent number: 9964669Abstract: A film obtained by molding a methacrylic resin composition, the methacrylic resin composition comprises: a methacrylic resin having a triad syndiotacticity (rr) of not less than 50% and a weight average molecular weight of 80000 to 200000 and comprising not less than 92% by mass of a structural unit derived from methyl methacrylate, and a polycarbonate resin having a melt volume-flow rate of 130 to 250 cm3/20 min at 300° C. and 1.2 Kg, in which a mass ratio of the methacrylic resin to the polycarbonate resin is 91/9 to 99/1, and the total content of the methacrylic resin and the polycarbonate resin is 80 to 100% by mass. The film is layered to at least one surface of a polarizer to give a polarizing plate.Type: GrantFiled: January 23, 2015Date of Patent: May 8, 2018Assignee: KURARAY Co., Ltd.Inventors: Atsuhiro Nakahara, Toru Abe, Yusaku Nomoto, Wataru Tsuji, Yuuki Takasuka, Takao Hoshiba
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Patent number: 9856342Abstract: A copolymer comprising a structural unit (I) derived from a phosphonate monomer (1) such as diethyl methacryloyloxymethyl phosphonate, diethyl 2-methacryloyloxyethyl phosphonate and the like, and a structural unit (II) derived from a radical polymerizable monomer (2) such as methacrylic acid, acrylic acid, 8-tricyclo[5.2.1.02,6]decanyl methacrylate, t-butyl methacrylate and the like, wherein the content of phosphorus atoms from the phosphonate monomer (1) is 2.0 to 6.0% by mass relative to the mass of the copolymer. A formed article comprising the copolymer.Type: GrantFiled: December 27, 2013Date of Patent: January 2, 2018Assignee: KURARAY Co., Ltd.Inventors: Toru Abe, Atsuhiro Nakahara, Hiroyuki Konishi, Hiroshi Ozawa
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Publication number: 20170313834Abstract: A methacrylate resin composition containing a methacrylate resin and a phenoxy resin and a film consisting of the same, each having high transparency, small phase differences in a thickness direction, low heat shrinkage rate, high strength and good adhesion properties are provided. The methacrylate resin composition contains a methacrylate resin with a triad syndiotacticity (rr) of equal to or more than 58% and a phenoxy resin, and the content of the phenoxy resin per 100 parts by mass of the methacrylate resin is in a range of 0.1 to 8 parts by mass, and the total content of the methacrylate resin and phenoxy resin is 80 mass % or more.Type: ApplicationFiled: November 11, 2015Publication date: November 2, 2017Applicant: KURARAY CO., LTD.Inventors: Nobutaka HIRAOKA, Toru ABE, Atsuhiro NAKAHARA, Yuuki TAKASUKA, Masayasu OGUSHI
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Publication number: 20170226249Abstract: A copolymer comprising a structural unit (I) derived from a phosphonate monomer (1) such as diethyl methacryloyloxymethyl phosphonate and diethyl 2-methacryloyloxyethyl phosphonate, a structural unit (II) derived from a radical polymerizable monomer (2) such as methacrylic acid, acrylic acid, 8-tricyclo[5.2.1.02,6]decanyl methacrylate, and t-butyl methacrylate, and a structural unit (III) derived from methyl methacrylate, the content of phosphorus atoms derived from the phosphonate monomer (1) being not less than 1.0% by mass and less than 2.0% by mass relative to the mass of the copolymer, and a formed article comprising the copolymer.Type: ApplicationFiled: August 12, 2015Publication date: August 10, 2017Applicant: KURARAY Co., Ltd.Inventors: Toru ABE, Atsuhiro NAKAHARA, Hiroshi OZAWA
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Publication number: 20170183428Abstract: A methacrylic resin composition comprises not less than 90% by mass and not more than 100% by mass of a methacrylic resin [A] having: the total content of a structural unit derived from methyl methacrylate of not less than 90% by mass; a molecular weight MA of not less than 30000 and not more than 100000 in terms of polystyrene corresponding to the retention time indicating the value of the maximum strength in a chromatogram obtained by gel permeation chromatography; the area SgA of a region enclosed by an approximate curve obtained by fitting the data of a range indicating the strength of not less than 70% relative to the value of the maximum strength to a Gaussian function by the method of nonlinear least squares and the base line of the chromatogram of 45 to 80% of the area SA enclosed by the chromatogram and its base line; and the ratio MwgA/MngA of a weight average molecular weight MwgA to a number average molecular weight MngA of not less than 1.01 and not more than 1.Type: ApplicationFiled: June 30, 2015Publication date: June 29, 2017Applicant: KURARAY Co., Ltd.Inventors: Atsuhiro NAKAHARA, Toru ABE, Toru TAKAHASHI, Hiroshi OZAWA
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Publication number: 20170183463Abstract: A methacrylic resin composition that has high transparency and a small phase difference in the thickness direction, and is easily stretched is provided. A methacrylic resin composition according to the present invention includes a methacrylic resin and a polycarbonate resin, in which the polycarbonate resin has a viscosity-average molecular weight larger than 15,000 and smaller than 32,000, a content of the polycarbonate resin based on 100 pts.mass of the methacrylic resin is no less than 1 pts.mass and no greater than 4 pts.mass, and a total amount of the methacrylic resin and the polycarbonate resin based on the methacrylic resin composition is 80 to 100 mass %.Type: ApplicationFiled: April 16, 2015Publication date: June 29, 2017Applicant: KURARAY CO., LTD.Inventors: Atsuhiro NAKAHARA, Toru ABE, Yusaku NOMOTO
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Publication number: 20170174802Abstract: A copolymer comprising structural units derived from a monomer represented by formula (1) and structural units derived from another monomer (A). (In formula (1), ring Z1 represents a C3-10 ring structure optionally having an oxygen atom at any position formed together with two carbon atoms on ?-butyrolactone. R1 represents a hydrogen atom or C1-10 alkyl group.Type: ApplicationFiled: February 3, 2015Publication date: June 22, 2017Applicant: KURARAY CO., LTD.Inventors: Atsuhiro NAKAHARA, Takashi FUKUMOTO, Hiroyuki KONISHI
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Patent number: 9605121Abstract: A film is obtained by forming a methacrylic resin composition comprising 100 parts by mass of a methacrylic resin (A) and preferably 1 to 10 parts by mass of a polycarbonate resin, the methacrylic resin (A) having a triad syndiotacticity (rr) of not less than 58%, a weight average molecular weight of 50000 to 150000, a content of fraction having a molecular weight of not less than 200000 of 0.1 to 10% by mass and a content of fraction having a molecular weight of less than 15000 of 0.2 to 5% by mass. A polarizer protective film comprising the above film is obtained.Type: GrantFiled: May 16, 2014Date of Patent: March 28, 2017Assignee: KURARAY Co., Ltd.Inventors: Toru Takahashi, Atsuhiro Nakahara, Hiroshi Ozawa, Toru Abe, Yusaku Nomoto
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Publication number: 20170010390Abstract: A film obtained by molding a methacrylic resin composition, the methacrylic resin composition comprises: a methacrylic resin having a triad syndiotacticity (rr) of not less than 50% and a weight average molecular weight of 80000 to 200000 and comprising not less than 92% by mass of a structural unit derived from methyl methacrylate, and a polycarbonate resin having an MVR of 130 to 250 cm3/20 min at 300° C. and 1.2 Kg, in which a mass ratio of the methacrylic resin to the polycarbonate resin is 91/9 to 99/1, and the total content of the methacrylic resin and the polycarbonate resin is 80 to 100% by mass. The film is layered to at least one surface of a polarizer to give a polarizing plate.Type: ApplicationFiled: January 23, 2015Publication date: January 12, 2017Applicant: KURARAY CO.,LTD.Inventors: Atsuhiro NAKAHARA, Toru ABE, Yusaku NOMOTO, Wataru TSUJI, Yuuki TAKASUKA, Takao HOSHIBA
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Publication number: 20160326288Abstract: Provided are a break-resistant copolymer having high transparency and heat resistance and also having a high tensile strain at break, and a molded article. A copolymer contains 80% by mass to 98% by mass of structural units derived from a methacrylic ester monomer and 2% to 10% by mass of ester structural units derived from a cyclic ketene acetal monomer. The copolymer has a weight average molecular weight of 80,000 or more and a molecular weight distribution of 1.75 to 3.80.Type: ApplicationFiled: January 7, 2015Publication date: November 10, 2016Applicant: KURARAY CO., LTD.Inventors: Atsuhiro NAKAHARA, Hiroshi OZAWA, Takashi FUKUMOTO, Nobutaka HIRAOKA
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Publication number: 20160096937Abstract: A film is obtained by forming a methacrylic resin composition comprising 100 parts by mass of a methacrylic resin (A) and preferably 1 to 10 parts by mass of a polycarbonate resin, the methacrylic resin (A) having a triad syndiotacticity (rr) of not less than 58%, a weight average molecular weight of 50000 to 150000, a content of fraction having a molecular weight of not less than 200000 of 0.1 to 10% by mass and a content of fraction having a molecular weight of less than 15000 of 0.2 to 5% by mass. A polarizer protective film comprising the above film is obtained.Type: ApplicationFiled: May 16, 2014Publication date: April 7, 2016Applicant: KURARAY CO., LTD.Inventors: Toru TAKAHASHI, Atsuhiro NAKAHARA, Hiroshi OZAWA, Toru ABE, Yusaku NOMOTO
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Publication number: 20160090479Abstract: A methacrylic resin [1] having a triad syndiotacticity (rr) of not less than 65% and a methacrylic resin [2] having a triad syndiotacticity (rr) of 45 to 58% are melt kneaded in a mass ratio of the methacrylic resin [1]/the methacrylic resin [2] of 40/60 to 70/30, and further melt kneaded preferably with a polycarbonate resin in a ratio of 1 to 10 parts by mass of the polycarbonate resin to the total 100 parts by mass of the methacrylic resin [1] and the methacrylic resin [2] to obtain a methacrylic resin composition.Type: ApplicationFiled: May 16, 2014Publication date: March 31, 2016Applicant: KURARAY CO., LTD.Inventors: Toru TAKAHASHI, Atsuhiro NAKAHARA, Hiroshi OZAWA, Toru ABE, Yusaku NOMOTO
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Publication number: 20160053062Abstract: An acrylic resin film is obtained by a method comprising bulk-polymerizing methyl methacrylate and an alkyl acrylate ester to obtain an acrylic thermoplastic resin component comprising more than 99% by mass of a methyl methacrylate unit and not more than 1% by mass of an alkyl acrylate ester unit, extruding, through a T-die, a resin composition comprising 70 to 95% by mass of the acrylic thermoplastic resin component and 5 to 30% by mass of a crosslinked rubber particle component, and forming the resultant into a thickness of 20 to 300 ?m with no bank.Type: ApplicationFiled: April 11, 2014Publication date: February 25, 2016Applicant: KURARAY CO., LTD.Inventors: Kaori MAEDA, Takuya TSUJIMOTO, Takao HOSHIBA, Atsuhiro NAKAHARA
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Publication number: 20160002380Abstract: A copolymer comprising a structural unit (I) derived from a phosphonate monomer (1) such as diethyl methacryloyloxymethyl phosphonate, diethyl 2-methacryloyloxyethyl phosphonate and the like, and a structural unit (II) derived from a radical polymerizable monomer (2) such as methacrylic acid, acrylic acid, 8-tricyclo[5.2.1.02,6]decanyl methacrylate, t-butyl methacrylate and the like, wherein the content of phosphorus atoms from the phosphonate monomer (1) is 2.0 to 6.0% by mass relative to the mass of the copolymer. A formed article comprising the copolymer.Type: ApplicationFiled: December 27, 2013Publication date: January 7, 2016Applicant: KURAKAY CO., LTD.Inventors: Toru ABE, Atsuhiro NAKAHARA, Hiroyuki KONISHI, Hiroshi OZAWA
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Publication number: 20150284520Abstract: A methacrylic resin composition, comprising a methacrylic resin which comprises 50-90% by mass of a structural unit derived from methyl methacrylate and 10-50% by mass of a structural unit derived from methacrylic acid alicyclic hydrocarbon ester, wherein the difference between the yellow index (YI4) at an optical path length of 200 mm for an injection molded article obtained at a cylinder temperature of 280° C. and a molding cycle of 4 minutes and the yellow index (YI1) at an optical path length of 200 mm for an injection molded article obtained at a cylinder temperature of 280° C. and a molding cycle of 1 minute is 3 or less, and the melt flow rate at a temperature of 230° C. and under a load of 3.8 kg is 5 g/10 min or more.Type: ApplicationFiled: November 8, 2013Publication date: October 8, 2015Applicant: KURARAY CO., LTD.Inventors: Hiroshi Ozawa, Takuro Niimura, Atsushi Matsumura, Atsuhiro Nakahara