Patents by Inventor Masahito Tada
Masahito Tada 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: 7208555Abstract: The present invention provides a polyvinylidene fluoride copolymer capable of forming a uniform film, a solution of the copolymer and a thin film comprising the polyvinylidene fluoride copolymer. The polyvinylidene fluoride copolymer of the present invention is characterized in that the ratio of the scattered-light intensity (I) for a 15% solution of the polyvinylidene fluoride copolymer in dimethylformamide solvent to the scattered-light intensity (I0) for dimethylformamide, (I/I0), is 10 or lower. The polyvinylidene fluoride copolymer solution comprises the polyvinylidene fluoride copolymer and an organic solvent capable of dissolving the copolymer.Type: GrantFiled: September 17, 2003Date of Patent: April 24, 2007Assignee: Kureha Chemical Industry Company, LimitedInventors: Masahito Tada, Takumi Katsurao, Tsukasa Ikeda, Kazuyuki Suzuki
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Patent number: 7198734Abstract: The invention provides an IC socket of synthetic resin, whose surface resistivity is strictly controlled to the desired level and which is much more improved in terms of electrical insulation properties, mechanical properties, heat resistance, chemical resistance, dimensional stability, etc. The IC socket is obtained by molding or otherwise forming a thermoplastic resin composition comprising 40 to 94% by mass of a thermoplastic resin, 5 to 30% by mass of a carbon precursor having a volume resistivity of 102 to 1010 ?·cm and 1 to 30% by mass of an electrical conductive filler having a volume resistivity of less than 102 ?·cm.Type: GrantFiled: March 27, 2002Date of Patent: April 3, 2007Assignee: Kureha CorporationInventors: Naomitsu Nishihata, Masahito Tada
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Patent number: 7151138Abstract: A resin composition comprises a resin component containing 40 to 99% by mass of a poly(aryl ketone) and 1 to 60% by mass of a poly(arylene sulfide), and 0.1 to 5 parts by mass, per 100 parts by mass of the resin component, of at least one thermosetting imide resin selected from the group consisting of a polyfunctional unsaturated imide compound and its thermoset product. The resin composition is improved in terms of compatibility, moldability or formability, melt flowability, mechanical properties, etc. while maintaining high levels of various properties such as heat resistance, flame retardancy, chemical resistance and dimensional stability.Type: GrantFiled: October 27, 2003Date of Patent: December 19, 2006Assignee: Kureha CorporationInventors: Naomitsu Nishihata, Masahito Tada
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Patent number: 7128996Abstract: The invention provides a solid polymer fuel cell separator that is molded or formed of a resin composition comprising a thermoplastic resin, a conductive carbon black having a bulk density of at least 0.3 g/ml and a DBP oil absorption of up to 150 ml/100 g and optionally a conductive filler having a volume resistivity of less than 1 ?·cm. The invention also provides a solid polymer fuel cell separator production process involving injection molding of the resin composition.Type: GrantFiled: May 10, 2002Date of Patent: October 31, 2006Assignee: Kureha CorporationInventors: Naomitsu Nishihata, Masahito Tada
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Publication number: 20050245708Abstract: The present invention provides a polyvinylidene fluoride copolymer capable of forming a uniform film, a solution of the copolymer and a thin film comprising the polyvinylidene fluoride copolymer. The polyvinylidene fluoride copolymer of the present invention is characterized in that the ratio of the scattered-light intensity (I) for a 15% solution of the polyvinylidene fluoride copolymer in dimethylformamide solvent to the scattered-light intensity (I0) for dimethylformamide, (I/I0), is 10 or lower. The polyvinylidene fluoride copolymer solution comprises the polyvinylidene fluoride copolymer and an organic solvent capable of dissolving the copolymer.Type: ApplicationFiled: September 17, 2003Publication date: November 3, 2005Inventors: Masahito Tada, Takumi Katsurao, Tsukasa Ikeda, Kazuyuki Suzuki
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Publication number: 20040146768Abstract: The invention provides a solid polymer fuel cell separator that is molded or formed of a resin composition comprising a thermoplastic resin, a conductive carbon black having a bulk density of at least 0.3 g/ml and a DBP oil absorption of up to 150 ml/100 g and optionally a conductive filler having a volume resistivity of less than 1 &OHgr;·cm. The invention also provides a solid polymer fuel cell separator production process involving injection molding of the resin composition.Type: ApplicationFiled: November 10, 2003Publication date: July 29, 2004Inventors: Naomitsu Nishihata, Masahito Tada
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Patent number: 6762229Abstract: A poly(arylene sulfide) resin composition comprising a poly(arylene sulfide) and, as a modifier, an organic amide compound compounded in a proportion of 0.2 to 10 parts by weight per 100 parts by weight of the poly(arylene sulfide).Type: GrantFiled: May 20, 1999Date of Patent: July 13, 2004Assignee: Kureha Kagaku Kogyo K.K.Inventors: Naomitsu Nishihata, Masahito Tada, Hiroyuki Sato, Kiyomi Ohuchi
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Publication number: 20040087733Abstract: A resin composition comprises a resin component containing 40 to 99% by mass of a poly(aryl ketone) and 1 to 60% by mass of a poly(arylene sulfide), and 0.1 to 5 parts by mass, per 100 parts by mass of the resin component, of at least one thermosetting imide resin selected from the group consisting of a polyfunctional unsaturated imide compound and its thermoset product. The resin composition is improved in terms of compatibility, moldability or formability, melt flowability, mechanical properties, etc. while maintaining high levels of various properties such as heat resistance, flame retardancy, chemical resistance and dimensional stability.Type: ApplicationFiled: October 27, 2003Publication date: May 6, 2004Inventors: Naomitsu Nishihata, Masahito Tada
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Publication number: 20040082205Abstract: The invention provides an IC socket of synthetic resin, whose surface resistivity is strictly controlled to the desired level and which is much more improved in terms of electrical insulation properties, mechanical properties, heat resistance, chemical resistance, dimensional stability, etc. The IC socket is obtained by molding or otherwise forming a thermoplastic resin composition comprising 40 to 94% by mass of a thermoplastic resin, 5 to 30% by mass of a carbon precursor having a volume resistivity of 102 to 1010 &OHgr;·cm and 1 to 30% by mass of an electrical conductive filler having a volume resistivity of less than 102 &OHgr;·cm.Type: ApplicationFiled: September 8, 2003Publication date: April 29, 2004Inventors: Naomitsu Nishihata, Masahito Tada
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Patent number: 6657005Abstract: A thermoplastic resin composition is formed by mixing (A) 30-84.9 wt. % of a crystalline thermoplastic resin, (B) 15-65 wt. % of a graft copolymer obtained by graft-polymerizing an ethylenically unsaturated monomer onto a rubber trunk polymer having an alkylene oxide group and (C) 0.1-5 wt. % of an anionic surfactant. As a result, it is possible to obtain a non-black thermoplastic resin composition which shows an antistatic property at a level suitable for use as an ESD (electrical static dissipative) and can be colored into arbitrary hues.Type: GrantFiled: October 18, 2001Date of Patent: December 2, 2003Assignee: Kureha Kagaku Kogyo Kabushiki KaishaInventors: Naomitsu Nishihata, Shiro Arai, Chikau Onodera, Masahito Tada
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Patent number: 6641878Abstract: An optical pickup device-holding container, which is formed from a resin composition comprising a poly(arylene sulfide) (A) and an inorganic filler (B) and having a thermal conductivity of at least 1 W/mK; and an optical pickup device in which at least a light source, an objective lens and a light-receiving part are held in the holding container.Type: GrantFiled: October 14, 1999Date of Patent: November 4, 2003Assignee: Kureha Kagaku Kogyo K.K.Inventors: Keiichiro Suzuki, Masahito Tada
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Publication number: 20030153660Abstract: A poly(arylene sulfide) resin composition comprising a poly(arylene sulfide) and, as a modifier, an organic amide compound compounded in a proportion of 0.2 to 10 parts by weight per 100 parts by weight of the poly(arylene sulfide).Type: ApplicationFiled: May 20, 1999Publication date: August 14, 2003Inventors: NAOMITSU NISHIHATA, MASAHITO TADA, HIROYUKI SATO
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Publication number: 20030129333Abstract: An optical pickup device-holding container, which is formed from a resin composition comprising a poly(arylene sulfide) (A) and an inorganic filler (B) and having a thermal conductivity of at least 1 W/mK; and an optical pickup device in which at least a light source, an objective lens and a light-receiving part are held in the holding container.Type: ApplicationFiled: October 14, 1999Publication date: July 10, 2003Inventors: KEIICHIRO SUZUKI, MASAHITO TADA
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Patent number: 6545075Abstract: A thermoplastic resin composition improved in compatibility, molding or forming ability, melt-flow properties and mechanical properties, which comprises 100 parts by weight of a resin component containing 40 to 99 wt. % of a poly(arylene sulfide) (A) and 1 to 60 wt. % of polyamide-imide (B), and 0.01 to 10 parts by weight of a silane compound (C) containing at least one functional group selected from the group consisting of amino, ureido, epoxy, isocyanate and mercapto groups.Type: GrantFiled: May 19, 2000Date of Patent: April 8, 2003Assignee: Kureha Kagaku Kogyo K.K.Inventors: Naomitsu Nishihata, Hiroyuki Sato, Masahito Tada
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Patent number: 6545081Abstract: A moderately conductive synthetic resin composition comprising a synthetic resin (A), a carbon precursor (B) and at least one conductive filler (C) selected from the group consisting of a non-fibrous conductive filler and a metallic fibrous material, both, having a volume resistivity lower than 102 &OHgr;·cm, and a moderately conductive synthetic resin composition comprising a synthetic resin (A), a carbon precursor (B) and carbon fiber (E).Type: GrantFiled: June 8, 2001Date of Patent: April 8, 2003Assignee: Kureha Kagaku Kogyo K.K.Inventors: Naomitsu Nishihata, Kiyomi Ohuchi, Masahito Tada
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Patent number: 6469606Abstract: A coil part which is obtained by sealing at least part of the periphery of a coil with a conductor wound on a bobbin with a high heat-conductive and magnetism-impermeable resin composition, and can efficiently guide out a magnetic flux generated to the outside and efficiently radiate heat generated to the outside.Type: GrantFiled: July 6, 2000Date of Patent: October 22, 2002Assignee: Kureha Kagaku Kogyo, K.K.Inventors: Masahito Tada, Keiichiro Suzuki, Sadao Nakanishi
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Publication number: 20020107335Abstract: A thermoplastic resin composition improved in compatibility, molding or forming ability, melt-flow properties and mechanical properties, which comprises 100 parts by weight of a resin component containing 40 to 99 wt. % of a poly(arylene sulfide) (A) and 1 to 60 wt. % of polyamide-imide (B), and 0.01 to 10 parts by weight of a silane compound (C) containing at least one functional group selected from the group consisting of amino, ureido, epoxy, isocyanate and mercapto groups.Type: ApplicationFiled: May 19, 2000Publication date: August 8, 2002Inventors: NAOMITSU NISHIHATA, HIROYUKI SATO, MASAHITO TADA
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Patent number: 6342557Abstract: A resin composition comprising a synthetic resin and a powdered magnetic material, wherein (1) the powdered magnetic material is soft ferrite powder having a rate of permeability change by temperature ranging from −0.040 to 0.010%/° C. in a temperature range of from 20° C. to 80° C. and an average particle diameter ranging from 2 to 1,000 &mgr;m, and (2) the powdered magnetic material is contained in a proportion of 50 to 1,400 parts by weight per 100 parts by weight of the synthetic resin, and a molded or formed product which is formed from the resin composition and exhibits a permeability stable to changes in environmental temperature.Type: GrantFiled: September 3, 1999Date of Patent: January 29, 2002Assignee: Kureha Kagaku Kogyo K.K.Inventors: Keiichiro Suzuki, Masahito Tada
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Patent number: 6338900Abstract: A soft magnetic composite material obtained by dispersing a powdered magnetic material (A) composed of soft ferrite in a polymer (B), wherein the powdered magnetic material (A) is a powdered magnetic material of a random form obtained by grinding a sintered magnetic material, and the average particle size (d2) of the powdered magnetic material (A) is greater than the average crystal grain size (d1) of the sintered magnetic material by at least twice.Type: GrantFiled: August 24, 1999Date of Patent: January 15, 2002Assignee: Kureha Kagaku Kogyo K.K.Inventors: Masahito Tada, Keiichiro Suzuki
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Patent number: 6130279Abstract: A resin composition comprising a poly(phenylene sulfide) resin and .alpha.-alumina, wherein the composition comprises (A) 15 to 45 wt. % of a poly(phenylene sulfide) resin having a melt viscosity of 5 to 100 Pa.multidot.s as measured at 310.degree. C. and a shear rate of 1200/sec, and (B) 85 to 55 wt. % of .alpha.-alumina which contains .alpha.-alumina composed of .alpha.-crystals having an average particle size of at least 5 .mu.m in a proportion of at least 40 wt. %.Type: GrantFiled: April 15, 1999Date of Patent: October 10, 2000Assignee: Kureha Kagaku Kogyo K.K.Inventors: Keiichiro Suzuki, Masahito Tada