Patents by Inventor Seishi Yoshikawa

Seishi Yoshikawa 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: 20240326395
    Abstract: A laminate 10 has a layer configuration including two thermoplastic resin layers 11 and 13 and an adhesive layer 15 provided between the two thermoplastic resin layers 11 and 13. The adhesive layer 15 is formed of an adhesive incorporating a polyrotaxane. The laminate 10 contains 80 mass % or greater of an olefin-based resin with respect to a total amount of the laminate 10.
    Type: Application
    Filed: June 12, 2024
    Publication date: October 3, 2024
    Applicants: TOYO SEIKAN GROUP HOLDINGS, LTD., TOYO SEIKAN CO., LTD.
    Inventors: Atsushi EBATA, Yuki TASHIRO, Tomoaki TAGUCHI, Seishi YOSHIKAWA, Takahiro YASUUMI
  • Patent number: 12084541
    Abstract: A polylactic acid solid composition includes: a polylactic acid having a weight average molecular weight of not more than 40,000, which is measured in terms of polystyrene standard by GPC; and a basic compound of an alkali metal or an alkaline earth metal, which is a residue of a molecular weight reduction accelerator. The basic compound is contained in an amount in a range of 0.5 to 20 mass %.
    Type: Grant
    Filed: March 30, 2020
    Date of Patent: September 10, 2024
    Assignee: TOYO SEIKAN GROUP HOLDINGS, LTD.
    Inventors: Tsutaki Katayama, Seishi Yoshikawa, Koki Shibata
  • Publication number: 20240009976
    Abstract: In a packaging bag (10) including multilayer films for packaging (5) including a heat-sealable resin layer (3) on a surface and formed by bonding two of the heat-sealable resin layers (3) of the multilayer films for packaging (5), oriented crystals are present in a seal portion (7) formed by bonding the heat-sealable resin layers (3).
    Type: Application
    Filed: September 10, 2021
    Publication date: January 11, 2024
    Applicant: TOYO SEIKAN GROUP HOLDINGS, LTD.
    Inventors: Kenya MAJIMA, Seishi YOSHIKAWA, Koki SHIBATA, Atsushi EBATA
  • Publication number: 20240010404
    Abstract: The layered body for packaging of the present invention includes a barrier film (1) having an inorganic coating (1b) formed on the surface of a thermoplastic resin film (1a), and an adhesive layer 3 provided on the inorganic coating (1b). The adhesive layer (3) is formed of an epoxy-based adhesive.
    Type: Application
    Filed: September 10, 2021
    Publication date: January 11, 2024
    Applicant: TOYO SEIKAN GROUP HOLDINGS, LTD.
    Inventors: Seishi YOSHIKAWA, Koki SHIBATA, Atsushi EBATA, Kenya MAJIMA
  • Publication number: 20230415381
    Abstract: Impurities are removed from plastic by cleaning using, as a cleaning medium, water heated to a level where a dielectric constant is 60 or less.
    Type: Application
    Filed: November 15, 2021
    Publication date: December 28, 2023
    Applicant: TOYO SEIKAN GROUP HOLDINGS, LTD.
    Inventors: Yuuki TASHIRO, Seishi YOSHIKAWA, Jotaro NAGAO, Azusa OTSUKI
  • Publication number: 20220332930
    Abstract: A propylene-based resin composition including an impact polypropylene component (A), and a linear low-density polyethylene component (B) containing methylpentene as a comonomer, the composition being characterized by containing a xylene-soluble fraction in an amount of 8 mass % or higher, and having an intrinsic viscosity measured for the xylene-soluble fraction is in a range from 1.0 to 2.9 dL/g.
    Type: Application
    Filed: September 3, 2020
    Publication date: October 20, 2022
    Applicant: TOYO SEIKAN GROUP HOLDINGS, LTD.
    Inventors: Seishi YOSHIKAWA, Koki SHIBATA, Atsushi EBATA, Takayuki ISHIHARA
  • Publication number: 20220213316
    Abstract: A high volume organic solvent polymer dispersion that is prepared by dispersing a hydrolysable polymer in a non-volatile water-soluble organic solvent, has a water content of not more than 1 mass %, and has a falling time at 50° C. of not more than 120 seconds which is measured by a Zahn cup with an orifice diameter of not more than 5 mm. Also disclosed is a method of using the high volume organic solvent polymer dispersion, which includes feeding the high volume organic solvent polymer dispersion into the ground.
    Type: Application
    Filed: February 20, 2020
    Publication date: July 7, 2022
    Applicant: TOYO SEIKAN GROUP HOLDINGS, LTD.
    Inventors: Koki SHIBATA, Tsutaki KATAYAMA, Seishi YOSHIKAWA
  • Publication number: 20220185952
    Abstract: A polylactic acid solid composition includes: a polylactic acid having a weight average molecular weight of not more than 40,000, which is measured in terms of polystyrene standard by GPC; and a basic compound of an alkali metal or an alkaline earth metal, which is a residue of a molecular weight reduction accelerator. The basic compound is contained in an amount in a range of 0.5 to 20 mass %.
    Type: Application
    Filed: March 30, 2020
    Publication date: June 16, 2022
    Applicant: TOYO SEIKAN GROUP HOLDINGS, LTD.
    Inventors: Tsutaki KATAYAMA, Seishi YOSHIKAWA, Koki SHIBATA
  • Publication number: 20220033572
    Abstract: A method of producing a polyoxalate copolymer using, as a diol component, an ethylene glycol and other diol in combination, and subjecting the diol component and a dimethyl oxalate to an esterification polymerization reaction. The esterification polymerization reaction is executed through a step that includes: a step of a normal-pressure polymerization inclusive of the esterification polymerization reaction of a oxalic acid formed from the dimethyl oxalate and the ethylene glycol, and a step of a reduced-pressure polymerization that is accompanied by a removal of diol after the step of the normal-pressure polymerization. Further, the other diol is added to the polymerization system at a predetermined temperature in the step of the normal-pressure polymerization.
    Type: Application
    Filed: October 13, 2021
    Publication date: February 3, 2022
    Applicant: TOYO SEIKAN GROUP HOLDINGS,LTD.
    Inventors: Tsutaki KATAYAMA, Seishi YOSHIKAWA
  • Patent number: 11148402
    Abstract: A multilayer container including: an outermost layer (1) containing a propylene-based polymer A containing homopolypropylene as a main component having a melt flow rate in a range of 2.0 to 10.0 g/10 min; an inner layer (2) containing 50 to 99% by weight of a propylene-based polymer B containing homopolypropylene as a main component having a melt flow rate of not more than 5.0 g/10 min and an isotactic index of not less than 93%, and 1 to 50% by weight of an ethylene-?-olefin copolymer C; and a barrier layer (4) occupying 5 to 20% by weight of the whole container. The ratio (L/D) of container height (L) to diameter (D) is not less than 0.5, and a volume shrinkage based on volume measured before and after heat sterilization at 121° C. for 30 minutes is not more than 5%.
    Type: Grant
    Filed: August 30, 2019
    Date of Patent: October 19, 2021
    Assignee: TOYO SEIKAN GROUP HOLDINGS, LTD.
    Inventors: Yuuki Tashiro, Takayuki Ishihara, Azusa Otsuki, Kenji Ichikawa, Toshiki Yamada, Seishi Yoshikawa, Koki Shibata
  • Publication number: 20210269587
    Abstract: A polylactic acid copolymer having more improved hydrolizability and hydrophilic property than those of the polylactic acid. The polylactic acid copolymer is obtained by the copolymerization of a polylactic acid with an acid-releasing ester polymer capable of releasing an acid other than the lactic acid upon the hydrolysis. The polylactic acid copolymer has a quantity of heat of fusion ?H of not more than 20 J/g as measured by using the DSC when the temperature is elevated the second time, contains the copolymer units stemming from the acid-releasing ester polymer in an amount of 0.5 to 35% by mass, and has a weight average molecular weight in a range of 15,000 to 40,000.
    Type: Application
    Filed: July 9, 2019
    Publication date: September 2, 2021
    Applicant: TOYO SEIKAN GROUP HOLDINGS, LTD.
    Inventors: Kouki SHIBATA, Seishi YOSHIKAWA, Tsutaki KATAYAMA
  • Patent number: 11104840
    Abstract: A method of extracting underground resources including a step of mixing hydrolysable particles and a proppant to an aqueous dispersion fluid, and introducing the fluid with pressure into an ore chute formed under the ground, wherein as the hydrolysable particles, use is made of spherical particles that include a hydrolysable resin of a weight average molecular weight (Mw) of not less than 5,000 and, specifically, not less than 10,000, and that have an average particle size (D50) in a range of 300 to 1,000 ?m, and a circularity of a short diameter/long diameter ratio of not less than 0.8. The spherical particles have a hyrolysable capability, a circularity and a particle size adapted to the hydraulic fracturing.
    Type: Grant
    Filed: February 4, 2016
    Date of Patent: August 31, 2021
    Assignee: TOYO SEIKAN GROUP HOLDINGS, LTD.
    Inventors: Seishi Yoshikawa, Tsutaki Katayama
  • Publication number: 20210197538
    Abstract: A multilayer container including: an outermost layer (1) containing a propylene-based polymer A containing homopolypropylene as a main component having a melt flow rate in a range of 2.0 to 10.0 g/10 min; an inner layer (2) containing 50 to 99% by weight of a propylene-based polymer B containing homopolypropylene as a main component having a melt flow rate of not more than 5.0 g/10 min and an isotactic index of not less than 93%, and 1 to 50% by weight of an ethylene-?-olefin copolymer C; and a barrier layer (4) occupying 5 to 20% by weight of the whole container. The ratio (L/D) of container height (L) to diameter (D) is not less than 0.5, and a volume shrinkage based on volume measured before and after heat sterilization at 121° C. for 30 minutes is not more than 5%.
    Type: Application
    Filed: August 30, 2019
    Publication date: July 1, 2021
    Applicant: TOYO SEIKAN GROUP HOLDINGS, LTD.
    Inventors: Yuuki TASHIRO, Takayuki ISHIHARA, Azusa OTSUKI, Kenji ICHIKAWA, Toshiki YAMADA, Seishi YOSHIKAWA, Kouki SHIBATA
  • Patent number: 10626246
    Abstract: A polylactic acid composition of a dispersion structure using, as a matrix, a lowly crystalline or amorphous polylactic acid having a crystallinity of not more than 40%, the matrix containing, as a pulverization promotor dispersed therein, an organically modified polysaccharide or a lamellar silicate that is swollen or that is treated to be swollen. The polylactic acid composition has excellent hydrolysable capability and property of being mechanically pulverized.
    Type: Grant
    Filed: February 17, 2015
    Date of Patent: April 21, 2020
    Assignee: TOYO SEIKAN GROUP HOLDINGS, LTD.
    Inventors: Seishi Yoshikawa, Toshiki Yamada, Tsutaki Katayama
  • Patent number: 10487620
    Abstract: A method of extracting the underground resources by pressurizing a fluid filled in an ore chute in which cracks are formed and by, further, forming or growing the cracks, the underground resources being extracted through the cracks, wherein a hydrolysis-blocking agent is introduced with pressure into the fluid to block a diverting agent that works to temporarily close the cracks.
    Type: Grant
    Filed: October 22, 2015
    Date of Patent: November 26, 2019
    Assignee: TOYO SEIKAN GROUP HOLDINGS, LTD.
    Inventors: Seishi Yoshikawa, Tsutaki Katayama
  • Patent number: 10385171
    Abstract: A powder comprising hydrolyzable resin particle, containing particles which do not pass through a sieve having an opening size of 500 ?m in an amount of 50 mass % or more and having a repose angle of 51° or more. This powder is preferably used as an additive for drilling to enhance the drilling properties of a drilling fluid and improve the retentivity of a fracture extending from a winze.
    Type: Grant
    Filed: August 11, 2015
    Date of Patent: August 20, 2019
    Assignee: TOYO SEIKAN GROUP HOLDINGS, LTD.
    Inventors: Seishi Yoshikawa, Toshiki Yamada, Tsutaki Katayama
  • Patent number: 10246625
    Abstract: A method of extracting underground natural resources through an ore chute located in a temperature region where temperature in the ground is not higher than 60° C., comprising introducing a dispersion solution obtained by dispersing polyoxaylate in water into the ore chute with pressure to hydrolyze the polyoxalate.
    Type: Grant
    Filed: July 12, 2016
    Date of Patent: April 2, 2019
    Assignee: TOYO SEIKAN GROUP HOLDINGS, LTD.
    Inventor: Seishi Yoshikawa
  • Publication number: 20190055348
    Abstract: A polyoxalate copolymer including an acid-constituting unit derived from an oxalic acid and a diol-constituting unit derived from a diol component, the diol-constituting unit being derived from a combination of an ethylene glycol and other diols, and having a temperature differential between a 5% weight loss temperature as measured by the TG-DTA and a melting point thereof in a range of 50 to 80° C.
    Type: Application
    Filed: January 11, 2017
    Publication date: February 21, 2019
    Applicant: Toyo Seikan Group Holdings, Ltd.
    Inventors: Tsutaki KATAYAMA, Seishi YOSHIKAWA
  • Patent number: 10040983
    Abstract: A dispersion solution for drilling obtained by dispersing, in an aqueous medium, a hydrolysable resin material that contains a resin that is hydrolysable but sparingly and a hydrolysable resin that accelerates the decomposition of esters. The dispersion solution for drilling exhibits a highly hydrolysable capability despite of using an inexpensive hydrolysable resin material, and can be favorably used for extracting resources relying on a well drilling method such as hydraulic fracturing method, rotary drilling method or riserless drilling method.
    Type: Grant
    Filed: December 12, 2013
    Date of Patent: August 7, 2018
    Assignee: TOYO SEIKAN GROUP HOLDINGS, LTD.
    Inventors: Seishi Yoshikawa, Tsutaki Katayama
  • Publication number: 20180010037
    Abstract: A method of extracting underground resources including a step of mixing hydrolysable particles and a proppant to an aqueous dispersion fluid, and introducing the fluid with pressure into an ore chute formed under the ground, wherein as the hydrolysable particles, use is made of spherical particles that include a hydrolysable resin of a weight average molecular weight (Mw) of not less than 5,000 and, specifically, not less than 10,000, and that have an average particle size (D50) in a range of 300 to 1,000 ?m, and a circularity of a short diameter/long diameter ratio of not less than 0.8. The spherical particles have a hyrolysable capability, a circularity and a particle size adapted to the hydraulic fracturing.
    Type: Application
    Filed: February 4, 2016
    Publication date: January 11, 2018
    Applicant: TOYO SEIKAN GROUP HOLDINGS, LTD.
    Inventors: Seishi YOSHIKAWA, Tsutaki KATAYAMA