Patents by Inventor Akihiko Iwashita

Akihiko Iwashita 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: 11492471
    Abstract: A propylene polymer satisfying (a) below, a soft propylene copolymer satisfying (b) below, and a polyolefin containing a structural unit derived from an unsaturated carboxylic acid and/or a derivative thereof, wherein (a) a melting point is 100° C. or more, and (b) an MFR is in the range of 0.01 to 100 g/10 min, at least one of the following requirements (b-1) and (b-2) is satisfied: (b-1) a syndiotactic triad fraction s 60% or more, and (b-2) a structural unit derived from propylene is 55 to 90 mol % and a structural unit derived from at least one olefin having 2 to 20 carbon atoms (excluding propylene) is contained at 10 to 45 mol % (with provisos), and the relation between an intrinsic viscosity [?] (dL/g) and the MFR satisfies the relation: 1.50×MFR?0.20?[?]?2.65×MFR?0.20.
    Type: Grant
    Filed: July 18, 2017
    Date of Patent: November 8, 2022
    Assignee: MITSUI CHEMICALS, INC.
    Inventors: Akihiko Iwashita, Shigeyuki Yasui
  • Patent number: 11292945
    Abstract: An adhesive resin composition of the invention includes an ethylene polymer (A) including an ethylene polymer graft-modified with an unsaturated carboxylic acid or a derivative thereof, and satisfies the following requirements (1) to (4). (1) The melt flow rate (MFR) measured at a temperature of 190° C. and a load of 2160 g in accordance with ASTM D 1238 is 0.1 to 3 g/10 min. (2) The density is 910 to 930 kg/m3. (3) The proportion of fractions that elute at 50° C. and below in crystallization elution fractionation chromatography measurement is not less than 20 mass %. (4) The proportion of fractions that elute at 90° C. and above in crystallization elution fractionation chromatography measurement is not less than 25 mass %.
    Type: Grant
    Filed: April 5, 2019
    Date of Patent: April 5, 2022
    Assignee: MITSUI CHEMICALS, INC.
    Inventors: Akihiko Iwashita, Yoshiyuki Ogawa
  • Publication number: 20220081598
    Abstract: An adhesive resin composition including a propylene polymer (A), an ethylene polymer (B), and a thermoplastic resin (C) including a copolymer containing not less than 60 mol % and not more than 99 mol % of structural units derived from 4-methyl-1-pentene, and not less than 1 mol % and not more than 40 mol % of structural units derived from a C2-C20 ?-olefin other than 4-methyl-1-pentene, these structural units representing total 100 mol % of the copolymer, the thermoplastic resin (C) showing a melting point Tm of not more than 199° C. or showing substantially no melting point as analyzed with a differential scanning calorimeter (DSC). The total of the components (A), (B) and (C) includes 45 to 75 parts by mass of the component (A), 5 to 20 parts by mass of the component (B), and 15 to 45 parts by mass of the component (C).
    Type: Application
    Filed: January 6, 2020
    Publication date: March 17, 2022
    Applicant: MITSUI CHEMICALS, INC.
    Inventors: Akihiko IWASHITA, Ryohei SHIGA, Motoyasu YASUI, Yoshisada FUKAGAWA, Kyoko KOBAYASHI, Masahiko OKAMOTO
  • Publication number: 20210108112
    Abstract: An adhesive resin composition of the invention includes an ethylene polymer (A) including an ethylene polymer graft-modified with an unsaturated carboxylic acid or a derivative thereof, and satisfies the following requirements (1) to (4). (1) The melt flow rate (MFR) measured at a temperature of 190° C. and a load of 2160 g in accordance with ASTM D 1238 is 0.1 to 3 g/10 min. (2) The density is 910 to 930 kg/m3. (3) The proportion of fractions that elute at 50° C. and below in crystallization elution fractionation chromatography measurement is not less than 20 mass %. (4) The proportion of fractions that elute at 90° C. and above in crystallization elution fractionation chromatography measurement is not less than 25 mass %.
    Type: Application
    Filed: April 5, 2019
    Publication date: April 15, 2021
    Applicant: MITSUI CHEMICALS, INC.
    Inventors: Akihiko IWASHITA, Yoshiyuki OGAWA
  • Publication number: 20210002465
    Abstract: Resin composition comprises 35 to 59.9 parts by mass of a propylene polymer (A) satisfying below; 25 to 40 parts by mass of a soft propylene copolymer (B); 0.1 to 10 parts by mass of a polyolefin (C) containing a structural unit derived from an unsaturated carboxylic acid and/or a derivative thereof; and 15 to 30 parts by mass of an ethylene polymer (D) (provided that the total of (A), (B), (C), and (D) is 100 parts by mass), wherein an MFR measured at 230° C. and a load of 2.16 kg according to ASTM D-1238 is 7 g/10 min or more and 25 g/10 min or less, with each component satisfying certain requirements.
    Type: Application
    Filed: February 8, 2019
    Publication date: January 7, 2021
    Applicant: MITSUI CHEMICALS, INC.
    Inventors: Akihiko IWASHITA, Yoshiyuki OGAWA, Youhei HOUTANI
  • Publication number: 20190300688
    Abstract: A propylene polymer satisfying (a) below, a soft propylene copolymer satisfying (b) below, and a polyolefin containing a structural unit derived from an unsaturated carboxylic acid and/or a derivative thereof, wherein (a) a melting point is 100° C. or more, and (b) an MFR is in the range of 0.01 to 100 g/10 min, at least one of the following requirements (b-1) and (b-2) is satisfied: (b-1) a syndiotactic triad fraction s 60% or more, and (b-2) a structural unit derived from propylene is 55 to 90 mol % and a structural unit derived from at least one olefin having 2 to 20 carbon atoms (excluding propylene) is contained at 10 to 45 mol % (with provisos), and the relation between an intrinsic viscosity [?] (dL/g) and the MFR satisfies the relation: 1.50×MFR?0.20?[?]?2.65×MFR?0.20.
    Type: Application
    Filed: July 18, 2017
    Publication date: October 3, 2019
    Applicant: MITSUI CHEMICALS, INC.
    Inventors: Akihiko IWASHITA, Shigeyuki YASUI
  • Patent number: 9771448
    Abstract: An olefin resin having requirements (I) to (VI) is provided: (I) a grafted olefin polymer containing a main chain with an ethylene/?-olefin copolymer and a side chain with a propylene polymer; (II) the ratio P wt % of propylene polymer is from 5 to 60 wt %; (III) when the ratio of the amount of a component(s) having a peak temperature of a differential elution curve as measured by CFC using o-dichlorobenzene of less that 65° C., to the amount of (?) taken as E wt %, the value a represented by an equation (Eq-1), is 1.4 or more; (IV) the melting point (Tm) is 120 to 165° C. and the glass transition temperature (Tg) is ?80 to ?30° C., as measured by DSC; (V) the hot xylene-insoluble content is less than 3 wt %; and, (VI) the limiting viscosity as measured in decalin at 135° C. is 0.5 to 5.0 dl/g.
    Type: Grant
    Filed: March 26, 2015
    Date of Patent: September 26, 2017
    Assignee: Mitsui Chemicals, Inc.
    Inventors: Yasushi Yanagimoto, Tomoaki Matsugi, Akihiko Iwashita, Tatsuya Nakamura, Keita Itakura, Ryoichi Tsunori
  • Patent number: 9714306
    Abstract: The present invention provides an olefin resin with an improved heat resistance, reduced stickiness, excellent optical and low temperature properties, as well as the balance between these physical properties. The olefin resin according to the present invention satisfies the following requirements: (I) a melting peak (Tm) is observed within the range of from 60° C. to 130° C., and the heat of fusion ?H at the melting peak is within the range of from 5 to 150 J/g; (II) the percentage E (wt %) of a portion soluble in o-dichlorobenzene at 20° C. or lower, and the heat of fusion ?H satisfy certain relationships; (III) the glass transition temperature (Tg) is from ?80 to ?30° C.
    Type: Grant
    Filed: March 26, 2015
    Date of Patent: July 25, 2017
    Assignee: MITSUI CHEMICALS, INC.
    Inventors: Yasushi Yanagimoto, Tomoaki Matsugi, Akihiko Iwashita, Tatsuya Nakamura, Junji Saito
  • Publication number: 20170101492
    Abstract: The present invention provides an olefin resin with an improved heat resistance, reduced stickiness, excellent optical and low temperature properties, as well as the balance between these physical properties. The olefin resin according to the present invention satisfies the following requirements: (I) a melting peak (Tm) is observed within the range of from 60° C. to 130° C., and the heat of fusion ?H at the melting peak is within the range of from 5 to 150 J/g; (II) the percentage E (wt %) of a portion soluble in o-dichlorobenzene at 20° C. or lower, and the heat of fusion ?H satisfy certain relationships; (III) the glass transition temperature (Tg) is from ?80 to ?30° C.
    Type: Application
    Filed: March 26, 2015
    Publication date: April 13, 2017
    Applicant: MITSUI CHEMICALS, INC.
    Inventors: Yasushi YANAGIMOTO, Tomoaki MATSUGI, Akihiko IWASHITA, Tatsuya NAKAMURA, Junji SAITO
  • Publication number: 20170096514
    Abstract: The present invention provides an olefin resin (?) satisfying the following requirements (I) to (VI), and a propylene resin composition including the same. (I) (?) includes a grafted olefin polymer [R1] containing a main chain composed of an ethylene/?-olefin copolymer and a side chain composed of a propylene polymer. (II) The ratio P wt % of the amount of the propylene polymer contained in (?) is from 5 to 60 wt %. (III) When the ratio of the amount of a component(s) having a peak temperature of a differential elution curve as measured by cross-fractionation chromatography (CFC) using o-dichlorobenzene as a solvent of less than 65° C., to the amount of (?) is taken as E wt %, the value a represented by the following equation (Eq-1), in relation to the ratio E and the ratio P, is 1.4 or more. (IV) The melting point (Tm) and the glass transition temperature (Tg), as measured by differential scanning calorimetry (DSC), are from 120 to 165° C. and from ?80 to ?30° C., respectively.
    Type: Application
    Filed: March 26, 2015
    Publication date: April 6, 2017
    Applicant: MITSUI CHEMICALS, INC.
    Inventors: Yasushi YANAGIMOTO, Tomoaki MATSUGI, Akihiko IWASHITA, Tatsuya NAKAMURA, Keita ITAKURA, Ryoichi TSUNORI
  • Patent number: 8134019
    Abstract: The present invention provides a method for producing a fullerene derivative, comprising the organic group addition step B in which an organic group is further added by reacting at least a basic compound and a halogen compound with a fullerene derivative, which is obtained by addition of a hydrogen atom and an organic group in the organic group addition step A, in which an organic group is added by reacting at least a Grignard reagent and a polar substance with a fullerene or fullerene derivative.
    Type: Grant
    Filed: November 6, 2007
    Date of Patent: March 13, 2012
    Assignee: Japan Science and Technology Agency
    Inventors: Eiichi Nakamura, Yutaka Matsuo, Akihiko Iwashita
  • Publication number: 20100048934
    Abstract: The present invention provides a method for producing a fullerene derivative, comprising the organic group addition step B in which an organic group is further added by reacting at least a basic compound and a halogen compound with a fullerene derivative, which is obtained by addition of a hydrogen atom and an organic group in the organic group addition step A, in which an organic group is added by reacting at least a Grignard reagent and a polar substance with a fullerene or fullerene derivative.
    Type: Application
    Filed: November 6, 2007
    Publication date: February 25, 2010
    Applicant: JAPAN SCIENCE AND TECHNOLOGY AGENCY
    Inventors: Eiichi Nakamura, Yutaka Matsuo, Akihiko Iwashita