Patents by Inventor Junichi Kitagawa

Junichi Kitagawa 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).

  • Publication number: 20240140071
    Abstract: A resin-coated metal sheet for containers includes a metal sheet and oriented films coating both surfaces of the metal sheet and made of a polyester resin, wherein the polyester resin includes 92 mol % or more of an ethylene terephthalate unit, the full-width at half maximum of a C?O peak at 1725 cm?1±5 cm?1 is 20 cm?1 or more and 25 cm?1 or less in Raman spectroscopy in an orientation direction of the surfaces of the films after coating the metal sheet, and the ratio (I1725/I1615) of the C?O peak intensity at 1725 cm?1±5 cm?1 to the C?C peak intensity at 1615 cm?1±5 cm?1 is 0.50 or more and 0.70 or less in the Raman spectroscopy.
    Type: Application
    Filed: March 23, 2022
    Publication date: May 2, 2024
    Applicant: JFE Steel Corporation
    Inventors: Junichi Kitagawa, Tomonari Hiraguchi, Yuya Kawai, Yasuhide Yoshida
  • Patent number: 11760065
    Abstract: A resin coated metal sheet for container includes a polyester resin coating layer in which 90 mol % or more of structural units are ethylene terephthalate units. A half-value width of a peak attributable to C?O stretching vibration around 1,730 cm?1 determined from laser Raman spectroscopic analysis measured by making a plane of polarization of linearly polarized laser light incident on a thickness direction section of the polyester resin coating layer perpendicularly to a thickness direction is 18.5 cm?1 to 22.0 cm?1 at a position with a thickness of 1.0 ?m from a metal sheet side of the polyester resin coating layer and is greater than 17.0 cm?1 and 18.5 cm?1 or less at a position with a thickness of 1.0 ?m from a surface side of the polyester resin coating layer.
    Type: Grant
    Filed: July 31, 2020
    Date of Patent: September 19, 2023
    Assignee: JFE STEEL CORPORATION
    Inventors: Tomonari Hiraguchi, Yuya Kawai, Junichi Kitagawa, Soichi Fujimoto, Yasuhide Oshima
  • Publication number: 20230101851
    Abstract: A resin-coated metal sheet for containers, on which wrinkle defects are not generated during a post-process heat treatment in can making of two-piece cans that involves a high degree of processing. The resin-coated metal sheet for containers includes a metal sheet and a resin coating layer disposed on each of surfaces of the metal sheet. The resin coating layer on at least one surface contains a resin material that contains 90 mol % or more of an ethylene terephthalate unit and that has a mobile amorphous content of 80% or more.
    Type: Application
    Filed: March 3, 2021
    Publication date: March 30, 2023
    Applicant: JFE STEEL CORPORATION
    Inventors: Yuya KAWAI, Junichi KITAGAWA, Yasuhide OSHIMA
  • Patent number: 11486018
    Abstract: A steel sheet for a two-piece can, the steel sheet includes: by mass %, C: 0.010% or more and less than 0.030%; Si: 0.04% or less; Mn: 0.10% or more and less than 0.40%; P: 0.02% or less; S: 0.020% or less; Al: more than 0.030% and 0.100% or less; N: 0.0005% or more and less than 0.0030%; B: 0.0005% to 0.0030%; and balance Fe and inevitable impurities, wherein an amount of N that is present as BN and a whole amount of N satisfy the following expression (1): [N as BN]/[N]>0.5 ??(1), where N as BN represents the amount of N that is present as BN, and N represents the whole amount of N, a yield point is 280 MPa or more and less than 420 MPa, yield elongation is 3% or less, and ?r is ?0.30 to 0.20.
    Type: Grant
    Filed: March 12, 2018
    Date of Patent: November 1, 2022
    Assignee: JFE STEEL CORPORATION
    Inventors: Hayato Saito, Nobusuke Kariya, Junichi Kitagawa, Katsumi Kojima
  • Publication number: 20220315794
    Abstract: A resin coated metal sheet includes: a metal sheet; and a resin layer formed on at least one face of the metal sheet. A movable amorphous amount of the resin layer measured by a temperature modulated differential scanning calorimeter being 30% to 46%. An intensity ratio I1,096/I1,119 between intensity (I1,096) of a peak attributable to a trans structure of methylene groups in polyethylene terephthalate (PET) around 1,096 cm?1 determined from laser Raman spectroscopic analysis measured by making a plane of polarization of linearly polarized laser light incident on a thickness direction section of the resin coating layer perpendicularly to a thickness direction and intensity (I1,119) of a peak attributable to a gauche structure of methylene groups in PET around 1,119 cm?1 determined from the laser Raman spectroscopic analysis being 1.1 or more and less than 1.5 at a position with a distance of 1 ?m from the metal sheet.
    Type: Application
    Filed: July 31, 2020
    Publication date: October 6, 2022
    Applicant: JFE STEEL CORPORATION
    Inventors: Tomonari HIRAGUCHI, Junichi KITAGAWA, Yuya KAWAI, Soichi FUJIMOTO, Yasuhide OSHIMA
  • Publication number: 20220274379
    Abstract: A resin coated metal sheet for container includes a polyester resin coating layer in which 90 mol % or more of structural units are ethylene terephthalate units. A half-value width of a peak attributable to C?O stretching vibration around 1,730 cm?1 determined from laser Raman spectroscopic analysis measured by making a plane of polarization of linearly polarized laser light incident on a thickness direction section of the polyester resin coating layer perpendicularly to a thickness direction is 18.5 cm?1 to 22.0 cm?1 at a position with a thickness of 1.0 ?m from a metal sheet side of the polyester resin coating layer and is greater than 17.0 cm?1 and 18.5 cm?1 or less at a position with a thickness of 1.0 ?m from a surface side of the polyester resin coating layer.
    Type: Application
    Filed: July 31, 2020
    Publication date: September 1, 2022
    Applicant: JFE STEEL CORPORATION
    Inventors: Tomonari HIRAGUCHI, Yuya KAWAI, Junichi KITAGAWA, Soichi FUJIMOTO, Yasuhide OSHIMA
  • Patent number: 11407203
    Abstract: A resin-coated metal sheet for a container includes: a metal sheet; a first resin coating layer provided on an inner face of the metal sheet after forming; and a second resin coating layer provided on an outer face of the metal sheet after forming, the second resin coating layer containing: polyester resin having a melting point of 230° C. to 254° C. as a main component; and a lubricant component, a melting point of the lubricant component being 80° C. to 230° C., an average particle diameter of the lubricant component present on a surface of the second resin coating layer being 17.0 nm or less.
    Type: Grant
    Filed: October 12, 2018
    Date of Patent: August 9, 2022
    Assignee: JFE Steel Corporation
    Inventors: Yuya Kawai, Junichi Kitagawa, Yasuhide Oshima, Katsumi Kojima
  • Patent number: 11401092
    Abstract: A resin-coated metal sheet for a container, the metal sheet including: a first resin coat layer provided on a first surface of the metal sheet; a second resin coat layer provided on a second surface of the metal sheet, wherein each of the first and the second resin coat layers is composed mainly of a polyester resin having a melting point of 230° C. to 254° C., and the first resin coat layer, in a state that the resin coat layers coat the metal sheet, is formed of a resin material having: an arithmetic average roughness (Ra) of 0.10 ?m to 1.0 ?m; a crystallization temperature of 110° C. to 160° C.; and a water contact angle of 55 degrees to 80 degrees in a state that the resin coat layers have been heated at 240° C. for 90 seconds after the resin coat layers coat the metal sheet.
    Type: Grant
    Filed: May 24, 2018
    Date of Patent: August 2, 2022
    Assignee: JFE STEEL CORPORATION
    Inventors: Junichi Kitagawa, Tomonari Hiraguchi, Norihiko Nakamura, Hayato Saito, Yasuhide Oshima, Katsumi Kojima
  • Publication number: 20200377274
    Abstract: A resin-coated metal sheet for a container includes: a metal sheet; a first resin coating layer provided on an inner face of the metal sheet after forming; and a second resin coating layer provided on an outer face of the metal sheet after forming, wherein a polar component of surface free energy of the second resin coating layer is 3.5 mN/m or more, after the second resin coating layer is subjected to heat treatment at a melting point of the second resin coating layer plus 8° C. for 2 minutes, and a static friction coefficient of the second resin coating layer, at 145° C., is 0.16 or less.
    Type: Application
    Filed: October 12, 2018
    Publication date: December 3, 2020
    Applicant: JFE Steel Corporation
    Inventors: Yuya Kawai, Junichi Kitagawa, Yasuhide Oshima, Katsumi Kojima
  • Publication number: 20200338863
    Abstract: A resin-coated metal sheet for a container includes: a metal sheet; a first resin coating layer provided on an inner face of the metal sheet after forming; and a second resin coating layer provided on an outer face of the metal sheet after forming, the second resin coating layer containing: polyester resin having a melting point of 230° C. to 254° C. as a main component; and a lubricant component, a melting point of the lubricant component being 80° C. to 230° C., an average particle diameter of the lubricant component present on a surface of the second resin coating layer being 17.0 nm or less.
    Type: Application
    Filed: October 12, 2018
    Publication date: October 29, 2020
    Applicant: JFE Steel Corporation
    Inventors: Yuya Kawai, Junichi Kitagawa, Yasuhide Oshima, Katsumi Kojima
  • Publication number: 20200262183
    Abstract: A laminated steel sheet for a both-sided resin-coated container includes a steel sheet, a first polyester resin layer formed on a surface of the steel sheet serving as an inner side of a container after the container is formed, and a second polyester resin layer formed on a surface of the steel sheet serving as an outer side of the container after the container is formed. The first polyester resin layer includes a polyethylene terephthalate content of 95% by weight or more and has a degree of crystallinity in a range of 3% to 25%. The second polyester resin layer includes polyethylene terephthalate and polybutylene terephthalate and has a proportion of polybutylene terephthalate in a range of 40% by weight to 80% by weight.
    Type: Application
    Filed: October 21, 2016
    Publication date: August 20, 2020
    Applicant: JFE STEEL CORPORATION
    Inventors: Norihiko Nakamura, Yasuhide Oshima, Junichi Kitagawa, Hiroki Nakamaru, Yoichiro Yamanaka
  • Publication number: 20200172308
    Abstract: A resin-coated metal sheet for a container, the metal sheet including: a first resin coat layer provided on a first surface of the metal sheet; a second resin coat layer provided on a second surface of the metal sheet, wherein each of the first and the second resin coat layers is composed mainly of a polyester resin having a melting point of 230° C. to 254° C., and the first resin coat layer, in a state that the resin coat layers coat the metal sheet, is formed of a resin material having: an arithmetic average roughness (Ra) of 0.10 ?m to 1.0 ?m; a crystallization temperature of 110° C. to 160° C.; and a water contact angle of 55 degrees to 80 degrees in a state that the resin coat layers have been heated at 240° C. for 90 seconds after the resin coat layers coat the metal sheet.
    Type: Application
    Filed: May 24, 2018
    Publication date: June 4, 2020
    Applicant: JFE STEEL CORPORATION
    Inventors: Junichi KITAGAWA, Tomonari HIRAGUCHI, Norihiko NAKAMURA, Hayato SAITO, Yasuhide OSHIMA, Katsumi KOJIMA
  • Publication number: 20200102624
    Abstract: A steel sheet for a two-piece can, the steel sheet includes: by mass %, C: 0.010% or more and less than 0.030%; Si: 0.04% or less; Mn: 0.10% or more and less than 0.40%; P: 0.02% or less; S: 0.020% or less; Al: more than 0.030% and 0.100% or less; N: 0.0005% or more and less than 0.0030; B: 0.0005% to 0.0030%; and balance Fe and inevitable impurities, wherein an amount of N that is present as BN and a whole amount of N satisfy the following expression (1): [N as BN]/[N]>0.5 ??(1), where N as BN represents the amount of N that is present as BN, and N represents the whole amount of N, a yield point is more than 280 MPa and less than 420 MPa, yield elongation is 3% or less, and ?r is ?0.30 to 0.20.
    Type: Application
    Filed: March 12, 2018
    Publication date: April 2, 2020
    Applicant: JFE Steel Corporation
    Inventors: Hayato Saito, Nobusuke Kariya, Junichi Kitagawa, Katsumi Kojima
  • Patent number: 10576712
    Abstract: A resin-coated metal sheet for containers that has excellent content releasability is provided. The resin-coated metal sheet includes a resin layer (A) and a resin layer (B). The resin layer (A) has a multilayer structure and is disposed on a side which, after the metal sheet is formed into a container, becomes the inner side of the container. The resin layer (B) is disposed on a side that becomes the outer side of the container. The resin layer (A) contains polyester as a main component and includes an uppermost resin layer (a1). A Raman band intensity ratio (I2968/I3085) on the surface of the resin layer (a1) is 0.6 to 0.9. The resin layer (B) includes polyester (I) composed mainly of polyethylene terephthalate and a polyester (II) composed mainly of polybutylene terephthalate. A Raman band intensity ratio on the surface of the resin layer (B) is 0.8 to 1.0.
    Type: Grant
    Filed: March 25, 2016
    Date of Patent: March 3, 2020
    Assignee: JFE STEEL CORPORATION
    Inventors: Yoichiro Yamanaka, Junichi Kitagawa, Hiroki Nakamaru, Norihiko Nakamura
  • Patent number: 10427381
    Abstract: A laminated metal sheet 1 includes a film 3 including a laminated resin layer including at least two layers with polyester as a main component formed on one face or both faces of a metal sheet 2. A polyester resin layer serving as a lower layer 3a in contact with the metal sheet 2 of the laminated resin layer contains 90 mol % or more of terephthalic acid as a polycarboxylic acid component and contains a polyol component containing ethylene glycol and 1,4-butanediol, in which the polyol component contains 30 to 50 mol % of ethylene glycol, 50 to 70 mol % of 1,4-butanediol, and 10 mol % or less of other polyol components. A polyester resin layer serving as an upper layer 3b of the laminated resin layer contains polyester containing terephthalic acid as a polycarboxylic acid component and 1,4-butanediol as a polyol component both of which are 90 mol % or more of the respective components, has a total thickness of 3 to 25 ?m, and has a ratio (I011/I100) of peak intensity (I011) observed in the range of 2?=15.
    Type: Grant
    Filed: March 31, 2016
    Date of Patent: October 1, 2019
    Assignee: JFE STEEL CORPORATION
    Inventors: Norihiko Nakamura, Junichi Kitagawa, Hiroki Nakamaru, Yoichiro Yamanaka
  • Patent number: 10399303
    Abstract: A resin-coated metal sheet for can lids includes a metal sheet coated with thermoplastic resin films on both surfaces and formed into a can lid. A thermoplastic resin film A based on polybutylene terephthalate (PBT) and polyethylene terephthalate (PET) is heat-fused on a surface of the metal sheet serving as an exterior surface of the can lid, and a thermoplastic resin film B based on polyethylene terephthalate (PET) is heat-fused on a surface of the metal sheet serving as an interior surface of the can lid. A composition ratio (wt %) of PBT/PET in the thermoplastic resin film A on the exterior surface is (PBT/PET)=(40/60) to (80/20), and the thermoplastic resin film B on the interior surface includes 95 mol % or more of PET.
    Type: Grant
    Filed: December 8, 2015
    Date of Patent: September 3, 2019
    Assignee: JFE STEEL CORPORATION
    Inventors: Norihiko Nakamura, Yoichiro Yamanaka, Junichi Kitagawa, Hiroki Nakamura, Hiroshi Kubo, Yusuke Nakagawa
  • Patent number: 10252319
    Abstract: A laminated steel sheet for a two-piece can body with a high strain level satisfying the following formulae, the polyester resin layer composing the laminated steel sheet having a center line surface roughness (Ra) of 0.2 ?m to 1.8 ?m: r1?r,0.1?r1/R?0.25, and 1.5?h/(R?r)?4 wherein h is the height of the two-piece can body, r is the maximum radius, r1 is the minimum radius, and R is the radius of the circular laminated steel sheet before forming having the same weight as the can body.
    Type: Grant
    Filed: May 19, 2016
    Date of Patent: April 9, 2019
    Assignee: JFE STEEL CORPORATION
    Inventors: Yasuhide Oshima, Junichi Kitagawa, Hiroki Iwasa, Katsumi Kojima, Hiroshi Kubo
  • Patent number: 10227156
    Abstract: A laminated metal sheet for a two-piece can includes: a metal sheet; and first and second polyester resin layers formed on outer and inner face sides of the container, respectively. The first polyester resin layer contains polyethylene terephthalate or a copolymerized polyethylene terephthalate with a content of a copolymerized component of less than 6 mol % in a ratio of 30% to 60% by mass, polybutylene terephthalate or a copolymerized polybutylene terephthalate with a content of a copolymerized component of less than 5 mol % in a ratio of 40% to 70% by mass, and a polyolefinic wax in an amount of 0.01% to 3.0% in outer percentage, the second polyester resin layer is a copolymerized polyethylene terephthalate with a content of a copolymerized component of less than 22 mol %, and residual degrees of orientation of the first and the second polyester resin layers are less than 30%.
    Type: Grant
    Filed: December 26, 2013
    Date of Patent: March 12, 2019
    Assignee: JFE STEEL CORPORATION
    Inventors: Yusuke Nakagawa, Junichi Kitagawa, Yoichiro Yamanaka, Yoichi Tobiyama
  • Patent number: 9993998
    Abstract: Provided is a resin-coated metal sheet for containers having a resin layer (A) on a side of the metal sheet, the side being a side that will serve as a container inner surface when the metal sheet is formed into a container. The resin layer (A) has a polyester-based multilayer structure. The resin layer (A) contains 85 mol % or more of terephthalic acid. The resin layer (A) includes at least two layers, and an uppermost resin layer (a1), which is to be in contact with contends, contains 0.10 to 2.0 mass % of a wax compound with respect to the uppermost resin layer (a1). The maximum value of the Raman band intensity ratio (I1720/I1615) when measured for the cross section of the uppermost resin layer (a1) by using a laser polarization plane parallel to the surface of the resin layer (a1) is in the range of 0.45 or more and 0.80 or less. The uppermost resin layer (a1) has a thickness of 0.5 ?m or more and 10 ?m or less.
    Type: Grant
    Filed: February 17, 2015
    Date of Patent: June 12, 2018
    Assignee: JFE STEEL CORPORATION
    Inventors: Yoichiro Yamanaka, Junichi Kitagawa, Hiroki Nakamaru
  • Publication number: 20180065339
    Abstract: A resin-coated metal sheet for containers that has excellent content releasability is provided. The resin-coated metal sheet includes a resin layer (A) and a resin layer (B). The resin layer (A) has a multilayer structure and is disposed on a side which, after the metal sheet is formed into a container, becomes the inner side of the container. The resin layer (B) is disposed on a side that becomes the outer side of the container. The resin layer (A) contains polyester as a main component and includes an uppermost resin layer (a1). A Raman band intensity ratio (I2968/I3085) on the surface of the resin layer (a1) is 0.6 to 0.9. The resin layer (B) includes polyester (I) composed mainly of polyethylene terephthalate and a polyester (II) composed mainly of polybutylene terephthalate. A Raman band intensity ratio on the surface of the resin layer (B) is 0.8 to 1.0.
    Type: Application
    Filed: March 25, 2016
    Publication date: March 8, 2018
    Applicant: JFE STEEL CORPORATION
    Inventors: Yoichiro YAMANAKA, Junichi KITAGAWA, Hiroki NAKAMARU, Norihiko NAKAMURA