Patents by Inventor Michiko Doi
Michiko Doi 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: 11898661Abstract: Provided is a fluororubber composition capable of providing a crosslinked fluororubber article that exhibits not only heat resistance, but also excellent mechanical properties at high temperatures. The fluororubber composition includes a fluororubber (A), a carbon black (B), and an aromatic petroleum resin (E), and the fluororubber composition has a difference ?G? (G? (1%)?G? (100%)) of not lower than 120 kPa and not higher than 3,000 kPa, where G? (1%) denotes a shear modulus at a dynamic strain of 1%, G? (100%) denotes a shear modulus at a dynamic strain of 100%, and G? (1%) and G? (100%) are determined by a dynamic viscoelasticity test carried out on an unvulcanised rubber with a rubber process analyzer (RPA) in a condition that the measurement frequency is 1 Hz and the measurement temperature is 100° C.Type: GrantFiled: February 22, 2013Date of Patent: February 13, 2024Assignee: DAIKIN INDUSTRIES, LTD.Inventors: Daisuke Ota, Akinori Ueda, Yuu Kadowaki, Mayuko Taeda, Masanori Kitaichi, Kazuhiro Yamamura, Michiko Doi, Shoji Fukuoka
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Patent number: 9976016Abstract: A fluororubber composition including a fluororubber having an iodine content of 10 to 90 mol % for the total mole of the polymer end groups and a carbon black (B), wherein a difference (?G?), represented by G?(1%)-G?(100%), is not lower than 120 kPa and not higher than 3,000 kPa, where G?(1%) denotes a shear modulus at a dynamic strain of 1% under an uncrosslinked state and G?(100%) denotes a shear modulus at a dynamic strain of 100% under an uncrosslinked state, and G?(1%) and G?(100%) are determined by a dynamic viscoelasticity test with a rubber process analyzer (RPA) in a condition that the measurement frequency is 1 Hz and the measurement temperature is 100° C.Type: GrantFiled: February 22, 2013Date of Patent: May 22, 2018Assignee: DAIKIN INDUSTRIES, LTD.Inventors: Daisuke Ota, Shigeru Morita, Akinori Ueda, Yuu Kadowaki, Masanori Kitaichi, Michiko Doi, Kazuhiro Yamamura, Shoji Fukuoka, Mayuko Taeda
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Patent number: 9499678Abstract: A fluororubber composition which includes a fluororubber (A) and a carbon black (B). The fluororubber (A) is a vinylidene fluoride-based fluororubber including a structural unit (VdF unit) derived from vinylidene fluoride and a structural unit derived from at least one monomer selected from the group consisting of hexafluoropropylene (HFP), 2,3,3,3-tetrafluoro propylene, and perfluoro(alkyl vinyl ether) (PAVE). The molar ratio of the VdF unit to the structural unit derived from at least one monomer selected from the group consisting of HFP, 2,3,3,3-tetrafluoro propylene, and PAVE is 50/50 to 78/22. The fluororubber composition has a difference ?G? (G? (1%)-G? (100%)) of not lower than 120 kPa and not higher than 3,000 kPa, where G? (1%) denotes a modulus of shearing elasticity at a dynamic strain of 1%, G? (100%) denotes a modulus of shearing elasticity at a dynamic strain of 100%, and G? (1%) and G? (100%) are determined by a dynamic viscoelasticity test.Type: GrantFiled: February 22, 2013Date of Patent: November 22, 2016Assignee: DAIKIN INDUSTRIES, LTD.Inventors: Daisuke Ota, Akinori Ueda, Yuu Kadowaki, Mayuko Taeda, Masanori Kitaichi, Kazuhiro Yamamura, Michiko Doi, Shoji Fukuoka
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Patent number: 9403954Abstract: The invention provides a fluororubber composition able to produce a crosslinked fluororubber article that exhibits not only heat resistance, but also excellent mechanical properties at high temperatures, and a method for producing same. The fluororubber composition contains: a fluororubber (A); and carbon black (B), wherein when the aforementioned fluororubber composition is immersed for 160 hours in an extraction solvent of acetone and hexane at an acetone:hexane mass ratio of 42.29:57.71 at 40° C. and an extraction residue that is not extracted and remains as a solid is separated from the aforementioned extraction solvent and dried and then the dry weight of the extraction residue is measured, the quantity of a solvent-insoluble polymer is not lower than 5%.Type: GrantFiled: January 18, 2013Date of Patent: August 2, 2016Assignee: DAIKIN INDUSTRIES, LTD.Inventors: Daisuke Ota, Akinori Ueda, Yuu Kadowaki, Mayuko Taeda, Masanori Kitaichi, Michiko Doi, Kazuhiro Yamamura, Shoji Fukuoka
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Publication number: 20150330537Abstract: Provided is a fluororubber composition capable of providing a crosslinked fluororubber article that exhibits not only heat resistance, but also excellent mechanical properties at high temperatures. The fluororubber composition includes a fluororubber (A), a carbon black (B), and an aromatic petroleum resin (E), and the fluororubber composition has a difference ?G? (G? (1%)?G? (100%)) of not lower than 120 kPa and not higher than 3,000 kPa, where G? (1%) denotes a shear modulus at a dynamic strain of 1%, G? (100%) denotes a shear modulus at a dynamic strain of 100%, and G? (1%) and G? (100%) are determined by a dynamic viscoelasticity test carried out on an unvulcanised rubber with a rubber process analyzer (RPA) in a condition that the measurement frequency is 1 Hz and the measurement temperature is 100° C.Type: ApplicationFiled: February 22, 2013Publication date: November 19, 2015Applicant: DAIKIN INDUSTRIES, LTD.Inventors: Daisuke OTA, Akinori UEDA, Yuu KADOWAKI, Mayuko TAEDA, Masanori KITAICHI, Kazuhiro YAMAMURA, Michiko DOI, Shoji FUKUOKA
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Patent number: 9102769Abstract: There is provided a polyol-crosslinkable fluorine-containing elastomer composition which is excellent in chemical resistance, solvent resistance (especially resistance to an acidic solvent) and fuel resistance (especially biofuel resistance) and is crosslinkable at the same crosslinking speed as in the case of using calcium hydroxide in a usual amount even without blending calcium hydroxide (or decreasing a blending amount of calcium hydroxide). The fluorine-containing elastomer composition comprises a polyol-crosslinkable fluorine-containing elastomer, a polyol crosslinking agent and a silicate of an alkali metal.Type: GrantFiled: June 7, 2013Date of Patent: August 11, 2015Assignee: DAIKIN INDUSTRIES, LTD.Inventors: Michiko Doi, Mitsuhiro Otani
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Publication number: 20150031822Abstract: A fluororubber composition which includes a fluororubber (A) and a carbon black (B). The fluororubber (A) is a vinylidene fluoride-based fluororubber including a structural unit (VdF unit) derived from vinylidene fluoride and a structural unit derived from at least one monomer selected from the group consisting of hexafluoropropylene (HFP), 2,3,3,3-tetrafluoro propylene, and perfluoro(alkyl vinyl ether) (PAVE). The molar ratio of the VdF unit to the structural unit derived from at least one monomer selected from the group consisting of HFP, 2,3,3,3-tetrafluoro propylene, and PAVE is 50/50 to 78/22. The fluororubber composition has a difference ?G? (G? (1%)-G? (100%)) of not lower than 120 kPa and not higher than 3,000 kPa, where G? (1%) denotes a modulus of shearing elasticity at a dynamic strain of 1%, G? (100%) denotes a modulus of shearing elasticity at a dynamic strain of 100%, and G? (1%) and G? (100%) are determined by a dynamic viscoelasticity test.Type: ApplicationFiled: February 22, 2013Publication date: January 29, 2015Applicant: DAIKIN INDUSTRIES, LTD.Inventors: Daisuke Ota, Akinori Ueda, Yuu Kadowaki, Mayuko Taeda, Masanori Kitaichi, Kazuhiro Yamamura, Michiko Doi, Shoji Fukuoka
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Publication number: 20150017364Abstract: A fluororubber composition including a fluororubber having an iodine content of 10 to 90 mol % for the total mole of the polymer end groups and a carbon black (B), wherein a difference (?G?), represented by G?(1%)-G?(100%), is not lower than 120 kPa and not higher than 3,000 kPa, where G?(1%) denotes a shear modulus at a dynamic strain of 1% under an uncrosslinked state and G?(100%) denotes a shear modulus at a dynamic strain of 100% under an uncrosslinked state, and G?(1%) and G?(100%) are determined by a dynamic viscoelasticity test with a rubber process analyzer (RPA) in a condition that the measurement frequency is 1 Hz and the measurement temperature is 100° C.Type: ApplicationFiled: February 22, 2013Publication date: January 15, 2015Applicant: DAIKIN INDUSTRIES, LTD.Inventors: Daisuke Ota, Shigeru Morita, Akinori Ueda, Yuu Kadowaki, Masanori Kitaichi, Michiko Doi, Kazuhiro Yamamura, Shoji Fukuoka, Mayuko Taeda
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Publication number: 20140288226Abstract: The invention provides a method for producing a fluororubber composition that is able to give a crosslinked article that exhibits not only heat resistance, but also excellent mechanical properties at high temperatures. A method for producing a fluororubber composition includes: a step (1-1) of mixing a fluororubber (A) and a carbon black (B) by means of an internal mixer until the maximum temperature reaches 80 to 220° C. so as to obtain an intermediate composition; a step (1-2) of cooling the intermediate composition to a temperature of less than 50° C.; and a step (2-1) of mixing the cooled intermediate composition until the maximum temperature reaches not lower than 10° C. but lower than 80° C. so as to obtain a fluororubber composition.Type: ApplicationFiled: January 18, 2013Publication date: September 25, 2014Applicant: DAIKIN INDUSTRIES, LTD.Inventors: Daisuke Ota, Akinori Ueda, Yuu Kadowaki, Mayuko Taeda, Masanori Kitaichi, Michiko Doi, Kazuhiro Yamamura, Shoji Fukuoka
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Publication number: 20140228482Abstract: The invention provides a fluororubber composition able to produce a crosslinked fluororubber article that exhibits not only heat resistance, but also excellent mechanical properties at high temperatures, and a method for producing same. The fluororubber composition contains: a fluororubber (A); and carbon black (B), wherein when the aforementioned fluororubber composition is immersed for 160 hours in an extraction solvent of acetone and hexane at an acetone:hexane mass ratio of 42.29:57.71 at 40° C. and an extraction residue that is not extracted and remains as a solid is separated from the aforementioned extraction solvent and dried and then the dry weight of the extraction residue is measured, the quantity of a solvent-insoluble polymer is not lower than 5%.Type: ApplicationFiled: January 18, 2013Publication date: August 14, 2014Applicant: DAIKIN INDUSTRIES, LTD.Inventors: Daisuke Ota, Akinori Ueda, Yuu Kadowaki, Mayuko Taeda, Masanori Kitaichi, Michiko Doi, Kazuhiro Yamamura, Shoji Fukuoka
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Publication number: 20130267662Abstract: There is provided a polyol-crosslinkable fluorine-containing elastomer composition which is excellent in chemical resistance, solvent resistance (especially resistance to an acidic solvent) and fuel resistance (especially biofuel resistance) and is crosslinkable at the same crosslinking speed as in the case of using calcium hydroxide in a usual amount even without blending calcium hydroxide (or decreasing a blending amount of calcium hydroxide). The fluorine-containing elastomer composition comprises a polyol-crosslinkable fluorine-containing elastomer, a polyol crosslinking agent and a silicate of an alkali metal.Type: ApplicationFiled: June 7, 2013Publication date: October 10, 2013Inventors: Michiko DOI, Mitsuhiro OTANI
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Patent number: 8481140Abstract: A molded article prepared by polyol-crosslinking a fluorine-containing elastomer composition containing a polyol-crosslinkable fluorine-containing elastomer, a polyol crosslinking agent and a silicate of an alkali metal.Type: GrantFiled: December 5, 2008Date of Patent: July 9, 2013Assignee: Daikin Industries, Ltd.Inventors: Michiko Doi, Mitsuhiro Otani
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Publication number: 20120231196Abstract: The present invention provides a laminated article having improved adhesion of the fluorine-containing resin layer to the elastomer layer. The laminated article comprises a fluorine-containing resin layer (a) formed using a fluorine-containing resin having a carbonyl group, an olefin group or an amino group at an end of a polymer trunk chain or an end of a polymer side chain, and an elastomer layer (b) formed using an elastomer composition.Type: ApplicationFiled: May 24, 2012Publication date: September 13, 2012Applicant: DAIKIN INDUSTRIES, LTD.Inventors: Toshiki ICHISAKA, Michiko DOI, Haruhisa MASUDA, Katsuhide OHTANI, Tomihiko YANAGIGUCHI, Tsuyoshi ONO, Tomohiro KINO, Tadahiro YABU
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Publication number: 20110287202Abstract: The present invention provides a laminated article having improved adhesion of the fluorine-containing resin layer to the elastomer layer. The laminated article comprises a fluorine-containing resin layer (a) formed using a fluorine-containing resin having a carbonyl group, an olefin group or an amino group at an end of a polymer trunk chain or an end of a polymer side chain, and an elastomer layer (b) formed using an elastomer composition.Type: ApplicationFiled: August 7, 2008Publication date: November 24, 2011Applicant: DAIKIN INDUSTRIES, LTD.Inventors: Toshiki Ichisaka, Michiko Doi, Haruhisa Masuda, Katsuhide Ohtani, Tomihiko Yanagiguchi, Tsuyoshi Ono, Tomohiro Kino, Tadahiro Yabu
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Publication number: 20110200777Abstract: There is provided a polyol-crosslinkable fluorine-containing elastomer composition which is excellent in chemical resistance, solvent resistance (especially resistance to an acidic solvent) and fuel resistance (especially biofuel resistance) and is crosslinkable at the same crosslinking speed as in the case of using calcium hydroxide in a usual amount even without blending calcium hydroxide (or decreasing a blending amount of calcium hydroxide). The fluorine-containing elastomer composition comprises a polyol-crosslinkable fluorine-containing elastomer, a polyol crosslinking agent and a silicate of an alkali metal.Type: ApplicationFiled: December 5, 2008Publication date: August 18, 2011Applicant: DAIKIN INDUSTRIES, LTD.Inventors: Michiko Doi, Mitsuhiro Otani