Patents by Inventor Fumiki Murakami
Fumiki 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: 11702492Abstract: The present invention provides a methacrylic resin composition comprising 100 parts by mass of a methacrylic resin comprising 50 to 97% by mass of a methacrylic acid ester monomer unit (A), 3 to 30% by mass of a structural unit (B) having a ring structure in the backbone, and 0 to 20% by mass of an additional vinyl monomer unit (C) copolymerizable with a methacrylic acid ester monomer, and 0.001 to 0.2 parts by mass of a compound (D) having a predetermined structure, the methacrylic resin composition satisfying the following conditions (I) and (II): (I): a weight-average molecular weight of the methacrylic resin composition as measured by gel permeation chromatography (GPC) is 65,000 to 300,000, and (II): a mass ratio between the component (D) and the structural unit (B) having a ring structure in the backbone is 25?(B)/(D)?1000.Type: GrantFiled: May 10, 2019Date of Patent: July 18, 2023Assignee: ASAHI KASEI KABUSHIKI KAISHAInventors: Nobuhiro Kobayashi, Fumiki Murakami
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Patent number: 11236209Abstract: A methacrylic resin composition comprises a methacrylic resin, the methacrylic resin comprising: 50 mass % to 97 mass % of a methacrylic acid ester monomer unit (A); 3 mass % to 30 mass % of a structural unit (B) having a cyclic structure-containing main chain; and 0 mass % to 20 mass % of another vinyl monomer unit (C) that is copolymerizable with a methacrylic acid ester monomer, wherein the methacrylic resin satisfies a specific condition; and the composition has a weight average molecular weight residual ratio of 80% or more upon heating under a nitrogen atmosphere at 280° C. for 1 hour, and has a weight average molecular weight residual ratio of 80% or more upon heating in air at 280° C. for 0.5 hours.Type: GrantFiled: March 17, 2017Date of Patent: February 1, 2022Assignee: ASAHI KASEI KABUSHIKI KAISHAInventors: Chihiro Hiramoto, Fumiki Murakami
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Publication number: 20210238326Abstract: The present invention provides a methacrylic resin composition comprising 100 parts by mass of a methacrylic resin comprising 50 to 97% by mass of a methacrylic acid ester monomer unit (A), 3 to 30% by mass of a structural unit (B) having a ring structure in the backbone, and 0 to 20% by mass of an additional vinyl monomer unit (C) copolymerizable with a methacrylic acid ester monomer, and 0.001 to 0.2 parts by mass of a compound (D) having a predetermined structure, the methacrylic resin composition satisfying the following conditions (I) and (II): (I): a weight-average molecular weight of the methacrylic resin composition as measured by gel permeation chromatography (GPC) is 65,000 to 300,000, and (II): a mass ratio between the component (D) and the structural unit (B) having a ring structure in the backbone is 25?(B)/(D)?1000.Type: ApplicationFiled: May 10, 2019Publication date: August 5, 2021Applicant: Asahi Kasei Kabushiki KaishaInventors: Nobuhiro KOBAYASHI, Fumiki MURAKAMI
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Patent number: 10597524Abstract: Provided are a methacrylic resin composition and a film containing a methacrylic resin that includes: 50 mass % to 97 mass % of a methacrylic acid ester monomer unit (A); 3 mass % to 30 mass % of a structural unit (B) having a cyclic structure-containing main chain; and 0 mass % to 20 mass % of another vinyl monomer unit (C) that is copolymerizable with a methacrylic acid ester monomer. The methacrylic resin satisfies the following conditions (1) and (2): (1) the methacrylic resin has a weight average molecular weight of 65,000 to 300,000 as measured by GPC; and (2) the total content of specific components is 0.01 mass % to 0.40 mass % as determined by GC/MS.Type: GrantFiled: November 14, 2016Date of Patent: March 24, 2020Assignee: ASAHI KASEI KABUSHIKI KAISHAInventors: Fumiki Murakami, Yutaka Tada, Yumika Kurihara, Nobuhiro Kobayashi, Masami Yonemura
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Publication number: 20190256632Abstract: Provided are a methacrylic resin composition that has adequate optical properties for practical use and excellent heat resistance, thermal stability, external appearance, and shaping processability, and a shaped product containing the same. The composition comprises a methacrylic resin, the methacrylic resin comprising: 50 mass % to 97 mass % of a methacrylic acid ester monomer unit (A); 3 mass % to 30 mass % of a structural unit (B) having a cyclic structure-containing main chain; and 0 mass % to 20 mass % of another vinyl monomer unit (C) that is copolymerizable with a methacrylic acid ester monomer, wherein the methacrylic resin satisfies a specific condition; and the composition has a weight average molecular weight residual ratio of 80% or more upon heating under a nitrogen atmosphere at 280° C. for 1 hour, and has a weight average molecular weight residual ratio of 80% or more upon heating in air at 280° C. for 0.5 hours.Type: ApplicationFiled: March 17, 2017Publication date: August 22, 2019Applicant: ASAHI KASEI KABUSHIKI KAISHAInventors: Chihiro HIRAMOTO, Fumiki MURAKAMI
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Publication number: 20180305538Abstract: Provided are a methacrylic resin composition and a film containing a methacrylic resin that includes: 50 mass % to 97 mass % of a methacrylic acid ester monomer unit (A); 3 mass % to 30 mass % of a structural unit (B) having a cyclic structure-containing main chain; and 0 mass % to 20 mass % of another vinyl monomer unit (C) that is copolymerizable with a methacrylic acid ester monomer. The methacrylic resin satisfies the following conditions (1) and (2): (1) the methacrylic resin has a weight average molecular weight of 65,000 to 300,000 as measured by GPC; and (2) the total content of specific components is 0.01 mass % to 0.40 mass % as determined by GC/MS.Type: ApplicationFiled: November 14, 2016Publication date: October 25, 2018Applicant: ASAHI KASEI KABUSHIKI KAISHAInventors: Fumiki MURAKAMI, Yutaka TADA, Yumika KURIHARA, Nobuhiro KOBAYASHI, Masami YONEMURA
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Patent number: 10017627Abstract: A methacrylic resin composition having high heat resistance, excellent birefringence, and excellent heat stability and molding processability is provided. A methacrylic resin composition comprises: a methacrylic resin including a structural unit (X) having a cyclic structure-containing main chain, the structural unit (X) being at least one type selected from the group consisting of an N-substituted maleimide monomer-derived structural unit, a glutarimide-based structural unit, and a lactone ring structural unit; and an organic phosphorous compound, wherein a glass transition temperature is more than 120° C. and 160° C. or less, a content of a phosphorus element is 10 mass ppm to 1000 mass ppm, and a ratio P3/P5 of an integral value P3 of a spectral peak assigned to trivalent phosphorus to an integral value P5 of a spectral peak assigned to pentavalent phosphorus in 31P-NMR measurement is 0.2 to 5.0.Type: GrantFiled: March 6, 2018Date of Patent: July 10, 2018Assignee: ASAHI KASEI KABUSHIKI KAISHAInventors: Katsuhiro Iwase, Keigo Sasaki, Harumi Watanabe, Toshiharu Seyama, Fumiki Murakami, Miyuki Kazunori
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Patent number: 9920148Abstract: A vehicle part cover including a methacrylic-based resin (I) having a weight average molecular weight measured by gel permeation chromatography (GPC) of 65,000 to 300,000, the methacrylic-based resin (I) comprising: 50 to 97% by mass of a methacrylate monomer unit (A); 3 to 30% by mass of a structural unit (B) having a ring structure in its main chain, and being at least one selected from the group consisting of a maleimide-based structural unit, a glutaric anhydride structural unit, a glutarimide-based structural unit, and a lactone ring structural unit; and 0 to 20% by mass of another vinyl monomer unit (C) that is copolymerizable with a methacrylate monomer.Type: GrantFiled: October 19, 2012Date of Patent: March 20, 2018Assignee: Asahi Kasei Chemicals CorporationInventor: Fumiki Murakami
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Publication number: 20150299360Abstract: A vehicle part cover including a methacrylic-based resin (I) having a weight average molecular weight measured by gel permeation chromatography (GPC) of 65,000 to 300,000, the methacrylic-based resin (I) comprising: 50 to 97% by mass of a methacrylate monomer unit (A); 3 to 30% by mass of a structural unit (B) having a ring structure in its main chain, and being at least one selected from the group consisting of a maleimide-based structural unit, a glutaric anhydride structural unit, a glutarimide-based structural unit, and a lactone ring structural unit; and 0 to 20% by mass of another vinyl monomer unit (C) that is copolymerizable with a methacrylate monomer.Type: ApplicationFiled: October 19, 2012Publication date: October 22, 2015Applicant: Asahi Kasei Chemicals CorporationInventor: Fumiki MURAKAMI
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Patent number: 8617708Abstract: A methacrylic resin, including 80 to 99.5% by mass of a methacrylic acid ester monomer unit, and 0.5 to 20% by mass of other vinyl monomer unit which is copolymerizable with at least one of the methacrylic acid ester, wherein the methacrylic resin satisfies the following conditions (I) to (III): (I) having a weight average molecular weight measured by gel permeation chromatography (GPC) of 60,000 to 300,000; (II) having a content of a molecular weight component 1/5 or less the peak molecular weight (Mp) obtained from a GPC elution curve, said content being 7 to 40% based on a region area ratio obtained from the GPC elution curve; and (III) having an angle of repose of 20 to 40°.Type: GrantFiled: October 22, 2010Date of Patent: December 31, 2013Assignee: Asahi Kasei Chemicals CorporationInventor: Fumiki Murakami
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Patent number: 8562873Abstract: A flame retardant resin composition comprising a specified metal oxide and/or trivalent phosphorus compound (A) and a specified phosphazene compound (B) together with an aromatic resin (C) added according to necessity. This flame retardant composition when mixed into resins, can provide resin compositions excelling in flame resistance, low smoke emission, heat resistance, moisture absorption resistance, dielectric performance, extrudability, mold release, thermal stability, mechanical properties, etc.Type: GrantFiled: November 5, 2004Date of Patent: October 22, 2013Assignee: Asahi Kasei Chemicals CorporationInventor: Fumiki Murakami
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Publication number: 20120196127Abstract: A methacrylic resin, including 80 to 99.5% by mass of a methacrylic acid ester monomer unit, and 0.5 to 20% by mass of other vinyl monomer unit which is copolymerizable with at least one of the methacrylic acid ester, wherein the methacrylic resin satisfies the following conditions (I) to (III): (I) having a weight average molecular weight measured by gel permeation chromatography (GPC) of 60,000 to 300,000; (II) having a content of a molecular weight component 1/5 or less the peak molecular weight (Mp) obtained from a GPC elution curve, said content being 7 to 40% based on a region area ratio obtained from the GPC elution curve; and (III) having an angle of repose of 20 to 40°.Type: ApplicationFiled: October 22, 2010Publication date: August 2, 2012Applicant: ASAHI KASEI CHEMICALS CORPORATIONInventor: Fumiki Murakami
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Patent number: 7759418Abstract: A flame retardant composition comprising a specific phenolic-based resin (A) and a specific phosphor compound (B) can be suitably used for a resin and can provide a resin composition which is excellent in flame retardancy, thermal resistance, moisture resistance, extrusion workability, demolding availability, thermal stability, impact resistance, mechanical properties and the like.Type: GrantFiled: October 13, 2005Date of Patent: July 20, 2010Assignee: Asahi Kasei Chemicals CorporationInventors: Fumiki Murakami, Jun-ichi Nakahashi
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Publication number: 20080051495Abstract: A flame retardant composition comprising a specific phenolic-based resin (A) and a specific phosphor compound (B) can be suitably used for a resin and can provide a resin composition which is excellent in flame retardancy, thermal resistance, moisture resistance, extrusion workability, demolding availability, thermal stability, impact resistance, mechanical properties and the like.Type: ApplicationFiled: October 13, 2005Publication date: February 28, 2008Applicant: Asahi Kasei Chemicals CorporationInventors: Fumiki Murakami, Jun-Ichi Nakahashi
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Publication number: 20070040154Abstract: A flame retardant resin composition comprising a specified metal oxide and/or trivalent phosphorus compound (A) and a specified phosphazene compound (B) together with an aromatic resin (C) added according to necessity. This flame retardant composition when mixed into resins, can provide resin compositions excelling in flame resistance, low smoke emission, heat resistance, moisture absorption resistance, dielectric performance, extrudability, mold release, thermal stability, mechanical properties, etc.Type: ApplicationFiled: November 5, 2004Publication date: February 22, 2007Applicant: ASAHI KASEI CHEMICALS CORPORATIONInventor: Fumiki Murakami
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Patent number: 7091266Abstract: A flame-retardant composition comprises a polyphenylene ether resin having a number average molecular weight in terms of polystyrene of 500 to 5,000 and a phosphazene compound, the content of the polyphenylene ether being 20 to 95% by weight and that of the phosphazene compound being 80 to 5% by weight. The flame-retardant composition is excellent in processability when added to resins, and can provide a resin composition that contains no halogens and has an excellent balance of processability, heat resistance and flame retardancy.Type: GrantFiled: May 27, 2003Date of Patent: August 15, 2006Assignee: Asahi Kasei Kabushiki KaishaInventors: Fumiki Murakami, Junnichi Nakahashi, Atsushi Nanasawa
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Patent number: 7060744Abstract: A phosphazene composition which has a content of volatile components of not less than 0.02% by weight and not more than 1.0% by weight when it is heated at 200° C. for 2 hours; is excellent in resistance to hydrolysis, and when the phosphazene composition is added to a resin, there is provided a resin composition which highly maintains the balance of resistance to hydrolysis, flame retardancy and stability of electric characteristics in a high-frequency field of not less than 1 GHz.Type: GrantFiled: August 27, 2003Date of Patent: June 13, 2006Assignee: Asahi Kasei Chemicals CorporationInventors: Fumiki Murakami, Jun-ichi Nakahashi, Atsushi Nanasawa, Tomoyuki Fujita
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Publication number: 20050228087Abstract: A flame-retardant composition comprises a polyphenylene ether resin having a number average molecular weight in terms of polystyrene of 500 to 5,000 and a phosphazene compound, the content of the polyphenylene ether being 20 to 95% by weight and that of the phosphazene compound being 80 to 5% by weight. The flame-retardant composition is excellent in processability when added to resins, and can provide a resin composition that contains no halogens and has an excellent balance of processability, heat resistance and flame retardancy.Type: ApplicationFiled: May 27, 2003Publication date: October 13, 2005Inventors: Fumiki Murakami, Junnichi Nakahashi, Atsushi Nanasawa
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Publication number: 20040039134Abstract: A phosphazene composition which has a content of volatile components of not less than 0.02% by weight and not more than 1.0% by weight when it is heated at 200° C. for 2 hours; is excellent in resistance to hydrolysis, and when the phosphazene composition is added to a resin, there is provided a resin composition which highly maintains the balance of resistance to hydrolysis, flame retardancy and stability of electric characteristics in a high-frequency field of not less than 1 GHz.Type: ApplicationFiled: August 27, 2003Publication date: February 26, 2004Inventors: Fumiki Murakami, Jun-Ichi Nakahashi, Atsushi Nanasawa, Tomoyuki Fujita
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Patent number: 4533750Abstract: A process for isolating methacrylic acid by solvent extraction from an aqueous methacrylic acid solution obtained from a gas phase catalytic oxidation reaction, characterized in that the aqueous methacrylic acid solution is previously first contacted with an extraction solvent, polymers precipitated out from the aqueous methacrylic acid solution are removed and the remainder is fed into an extraction column.Type: GrantFiled: July 17, 1980Date of Patent: August 6, 1985Assignee: Mitsubishi Rayon Co. Ltd.Inventors: Hiroshi Matsumura, Masato Otani, Fumiki Murakami