Patents by Inventor Kiyoka Okada
Kiyoka Okada 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: 11352470Abstract: The present invention achieves higher performance (improvement in, for example, heat resistance, durability, and mechanical characteristics) of polyamide resin by a method which is not dependent on a combination with fibers. According to an embodiment of a polyamide resin member of the present invention, the polyamide resin member contains nano-oriented crystals of polyamide 66, and has a high heatproof temperature (Th?278° C.) and a high melting point (Tm?282° C.).Type: GrantFiled: May 9, 2018Date of Patent: June 7, 2022Assignee: BRIDGESTONE CORPORATIONInventors: Masamichi Hikosaka, Kiyoka Okada, Kenichiro Iwasaki, Kei Yasui, Katsuomi Tanahashi, Katsumi Nabeshima, Mai Ishikawa
-
Publication number: 20210017375Abstract: The invention provides a molded article having excellent mechanical strength, heat resistance, surface roughness, and ferroelectricity. The molded article contains a crystal of a vinylidene fluoride/tetrafluoroethylene copolymer. The crystal is a ? crystal and is a nano-oriented crystal that has a size of 100 nm or smaller. The molded article has an arithmetic average roughness of 3.0 ?m or lower.Type: ApplicationFiled: March 27, 2019Publication date: January 21, 2021Applicants: HIROSHIMA UNIVERSITY, DAIKIN INDSTRIES, LTD.Inventors: Masamichi HIKOSAKA, Kiyoka OKADA, Toshiyuki FUKUSHIMA, Kyouhei SAWAKI, Ken OKANISHI, Yasuyuki YAMAGUCHI
-
Publication number: 20200157295Abstract: The present invention achieves higher performance (improvement in, for example, heat resistance, durability, and mechanical characteristics) of polyamide resin by a method which is not dependent on a combination with fibers. According to an embodiment of a polyamide resin member of the present invention, the polyamide resin member contains nano-oriented crystals of polyamide 66, and has a high heatproof temperature (Th?278° C.) and a high melting point (Tm?282° C.).Type: ApplicationFiled: May 9, 2018Publication date: May 21, 2020Applicant: BRIDGESTONE CORPORATIONInventors: Masamichi HIKOSAKA, Kiyoka OKADA, Kenichiro IWASAKI, Kei YASUI, Katsuomi TANAHASHI, Katsumi NABESHIMA, Mai ISHIKAWA
-
Patent number: 10420209Abstract: The polyester sheet in accordance with an aspect of the present invention contains crystals of polyester which is a polycondensate of polyvalent carboxylic acid and polyalcohol. The polyester sheet contains nano-oriented crystals which contain crystals of polyester in each of which a polymer chain is highly oriented and each of which has a crystal size of 50 nm or less. A heatproof temperature of the polyester sheet is higher than a temperature that is lower than an equilibrium melting point of the polyester by 80° C., and a melting point of the polyester sheet is higher than a temperature that is lower than the equilibrium melting point of the polyester by 40° C.Type: GrantFiled: August 24, 2015Date of Patent: September 17, 2019Assignee: HIROSHIMA UNIVERSITYInventors: Masamichi Hikosaka, Kiyoka Okada, Yoshitaka Tanaka
-
Publication number: 20170295645Abstract: The polyester sheet in accordance with an aspect of the present invention contains crystals of polyester which is a polycondensate of polyvalent carboxylic acid and polyalcohol. The polyester sheet contains nano-oriented crystals which contain crystals of polyester in each of which a polymer chain is highly oriented and each of which has a crystal size of 50 nm or less. A heatproof temperature of the polyester sheet is higher than a temperature that is lower than an equilibrium melting point of the polyester by 80° C., and a melting point of the polyester sheet is higher than a temperature that is lower than the equilibrium melting point of the polyester by 40° C.Type: ApplicationFiled: August 24, 2015Publication date: October 12, 2017Applicants: HIROSHIMA UNIVERSITY, TEIJIN FILM SOLUTIONS LIMITEDInventors: Masamichi HIKOSAKA, Kiyoka OKADA, Yoshitaka TANAKA
-
Patent number: 9605116Abstract: A method for secondary-molding a polymer nano oriented crystal material in accordance with an embodiment of the present invention includes the steps of: heating the polymer nano oriented crystal material so that the polymer nano oriented crystal material changes into a mobile phase or a melt having a dense entanglement network structure; molding the polymer nano oriented crystal material which changed into the mobile phase or the melt including the dense entanglement network in the step; and cooling the polymer nano oriented crystal material, which has undergone the step, until the polymer nano oriented crystal material changes into an ordered phase.Type: GrantFiled: October 7, 2011Date of Patent: March 28, 2017Assignees: SUNALLOMER LTD., HIROSHIMA UNIVERSITYInventors: Masamichi Hikosaka, Kiyoka Okada, Junichiro Washiyama, Takeshi Nakajima, Yuka Akiyama, Shingo Ueno
-
Patent number: 9138933Abstract: A process and apparatus for manufacturing a crystalline resin film or sheet. This manufacturing apparatus includes: an extruder that melts crystalline resin while supplying it; a gear pump that is provided on the downstream side of the extruder; a die which is provided on the downstream side of the gear pump, and which has a slit-shaped aperture; a cooling apparatus which cools film-shaped or sheet-shaped crystalline resin (A) discharged in a melted state from the die to a temperature which is not less than the crystallization temperature but not more than the melting point; and a pair of pinch rolls that press-roll between them the film-shaped or sheet-shaped crystalline resin (B) which has passed through the cooling apparatus (40), wherein the pair of guide rolls are positioned such that the thickness of the film-shaped or sheet-shaped crystalline resin (B) which has passed through the cooling apparatus is between 1.3 and 8.0 times the thickness of the film or sheet (C, D) after it has been press-rolled.Type: GrantFiled: January 22, 2010Date of Patent: September 22, 2015Assignee: SunAllomer Ltd.Inventors: Junichiro Washiyama, Hideharu Kimura, Koji Yamada, Takeshi Nakajima, Akihiro Otsubo, Masamichi Hikosaka, Kiyoka Okada, Kaori Watanabe
-
Patent number: 8735523Abstract: One embodiment of the present invention provides polymer crystalline materials containing crystals of the polymer and satisfying the following requirements (I) and (II) or the following requirements (I) and (III): (I) the polymer crystalline materials a crystallinity of 70% or greater; (II) the crystals are 300 nm or less in size; and (III) the crystals have a number density of 40 ?m?3 or greater. This allows an embodiment of the present invention to provide polymer crystalline materials which are excellent in properties such as mechanical strength, heat tolerance, and transparency or, in particular, polymer crystalline materials, based on a general-purpose plastic such as PP, which is excellent in properties such as mechanical strength, heat tolerance, and transparency.Type: GrantFiled: February 27, 2008Date of Patent: May 27, 2014Assignee: Hiroshima UniversityInventors: Masamichi Hikosaka, Kaori Watanabe, Kiyoka Okada
-
Patent number: 8728616Abstract: A polymer sheet according to at least one embodiment of the present invention is a polymer sheet whose main component is oriented nanocrystals of a polymer, and which satisfies the following conditions (I), (II), and (III): (I) having a crystallinity of not less than 70%; (II) having a tensile strength at break of not less than 100 MPa and a tensile modulus of not less than 3 GPa; and (III) having an average thickness of not less than 0.15 mm. According to at least one embodiment of the present invention, it is possible to provide a polymer sheet excelling in properties such as mechanical strength, heat tolerance, and transparency, particularly a polymer sheet having excellent properties such as mechanical strength, heat tolerance, and transparency in general-purpose plastics such as polypropylene.Type: GrantFiled: January 21, 2010Date of Patent: May 20, 2014Assignees: Hiroshima University, Sunallomer Ltd.Inventors: Masamichi Hikosaka, Kiyoka Okada, Kaori Watanabe, Junichiro Washiyama, Hideharu Kimura, Koji Yamada, Takeshi Nakajima, Akihiro Otsubo
-
Publication number: 20130196168Abstract: A method for secondary-molding a polymer nano oriented crystal material in accordance with an embodiment of the present invention includes the steps of: heating the polymer nano oriented crystal material so that the polymer nano oriented crystal material changes into a mobile phase or a melt having a dense entanglement network structure; molding the polymer nano oriented crystal material which changed into the mobile phase or the melt including the dense entanglement network in the step; and cooling the polymer nano oriented crystal material, which has undergone the step, until the polymer nano oriented crystal material changes into an ordered phase.Type: ApplicationFiled: October 7, 2011Publication date: August 1, 2013Applicants: SUNALLOMER LTD., HIROSHIMA UNIVERSITYInventors: Masamichi Hikosaka, Kiyoka Okada, Junichiro Washiyama, Takeshi Nakajima, Yuka Akiyama, Shingo Ueno
-
Publication number: 20120018917Abstract: A process and apparatus for manufacturing a crystalline resin film or sheet. This manufacturing apparatus includes: an extruder that melts crystalline resin while supplying it; a gear pump that is provided on the downstream side of the extruder; a die which is provided on the downstream side of the gear pump, and which has a slit-shaped aperture; a cooling apparatus which cools film-shaped or sheet-shaped crystalline resin (A) discharged in a melted state from the die to a temperature which is not less than the crystallization temperature but not more than the melting point; and a pair of pinch rolls that press-roll between them the film-shaped or sheet-shaped crystalline resin (B) which has passed through the cooling apparatus (40), wherein the pair of guide rolls are positioned such that the thickness of the film-shaped or sheet-shaped crystalline resin (B) which has passed through the cooling apparatus is between 1.3 and 8.0 times the thickness of the film or sheet (C, D) after it has been press-rolled.Type: ApplicationFiled: January 22, 2010Publication date: January 26, 2012Applicant: SunAllomer Ltd.Inventors: Junichiro Washiyama, Hideharu Kimura, Koji Yamada, Takeshi Nakajima, Akihiro Otsubo, Masamichi Hikosaka, Kiyoka Okada, Kaori Watanabe
-
Publication number: 20110300364Abstract: A polymer sheet according to at least one embodiment of the present invention is a polymer sheet whose main component is oriented nanocrystals of a polymer, and which satisfies the following conditions (I), (II), and (III): (I) having a crystallinity of not less than 70%; (II) having a tensile strength at break of not less than 100 MPa and a tensile modulus of not less than 3 GPa; and (III) having an average thickness of not less than 0.15 mm. According to at least one embodiment of the present invention, it is possible to provide a polymer sheet excelling in properties such as mechanical strength, heat tolerance, and transparency, particularly a polymer sheet having excellent properties such as mechanical strength, heat tolerance, and transparency in general-purpose plastics such as polypropylene.Type: ApplicationFiled: January 21, 2010Publication date: December 8, 2011Applicants: SUNALLOMER LTD., HIROSHIMA UNIVERSITYInventors: Masamichi Hikosaka, Kiyoka Okada, Kaori Watanabe, Junichiro Washiyama, Hideharu Kimura, Koji Yamada, Takeshi Nakajima, Akihiro Otsubo
-
Publication number: 20100063235Abstract: One embodiment of the present invention provides polymer crystalline materials containing crystals of the polymer and satisfying the following requirements (I) and (II) or the following requirements (I) and (III): (I) the polymer crystalline materials a crystallinity of 70% or greater; (II) the crystals are 300 nm or less in size; and (III) the crystals have a number density of 40 ?m?3 or greater. This allows an embodiment of the present invention to provide polymer crystalline materials which are excellent in properties such as mechanical strength, heat tolerance, and transparency or, in particular, polymer crystalline materials, based on a general-purpose plastic such as PP, which is excellent in properties such as mechanical strength, heat tolerance, and transparency.Type: ApplicationFiled: February 27, 2008Publication date: March 11, 2010Inventors: Masamichi Hikosaka, Kaori Watanabe, Kiyoka Okada