Patents by Inventor Takeyuki Igarashi
Takeyuki Igarashi 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: 11279117Abstract: Provided is a fuel container composed of a multilayer structure containing: an ethylene-vinyl alcohol copolymer (A) layer; an adhesive resin (B) layer; a high-density polyethylene (C) layer; and a resin composition (D) layer, wherein the ethylene-vinyl alcohol copolymer (A) contains 15 to 44 mol % of ethylene, the adhesive resin (B) is a maleic anhydride-modified polyolefin having an acid value of 0.1 to 10 mgKOH/g and containing 1 to 8.5 ?mol/g of magnesium element, calcium element, zinc element, or a combination thereof, the resin composition (D) contains the ethylene-vinyl alcohol copolymer (A), the adhesive resin (B), and the high-density polyethylene (C), the thickness of the (A) layer, the (B) layer, and the (C) layer satisfies specific conditions, and the ethylene-vinyl alcohol copolymer (A), the adhesive resin (B), and the high-density polyethylene (C) satisfies specific conditions. The fuel container is excellent in fuel barrier properties and impact resistance and enables stable production.Type: GrantFiled: June 29, 2017Date of Patent: March 22, 2022Assignee: KURARAY CO., LTD.Inventors: Takeyuki Igarashi, Shogo Nakazawa
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Patent number: 10975236Abstract: Provided is a resin mixture, comprising: polyolefin (A); a saponified ethylene-vinyl acetate copolymer (B); and an acid modified olefin-vinyl carboxylate copolymer (C), wherein the acid modified olefin-vinyl carboxylate copolymer (C) has an olefin content of from 50 to 95 mol %, and a difference between an ethylene content of the saponified ethylene-vinyl acetate copolymer (B) and the olefin content of the acid modified olefin-vinyl carboxylate copolymer (C) is within a range of from 20 to 70 mol %. This enables to provide a resin mixture that contains polyolefin and an EVOH, and even in continuous melt molding over a long period of time, has a less amount of screw buildup of a degraded material and also is reduced in generation of fish-eyes, cords, and streaks in a molded product obtained therefrom.Type: GrantFiled: November 1, 2011Date of Patent: April 13, 2021Assignee: KURARAY CO., LTD.Inventors: Takeyuki Igarashi, Shinji Tai
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Patent number: 10633532Abstract: Provided is a resin composition, comprising: an isobutylene-based copolymer (A) containing a halogen atom; an ethylene-vinyl alcohol copolymer (B); and a halogen scavenger (C), wherein a mass ratio (B/A) of the ethylene-vinyl alcohol copolymer (B) to the isobutylene-based copolymer (A) containing a halogen atom is from 20/80 to 50/50, and a content of the halogen scavenger (C) is from 0.01 to 1 part by mass based on 100 parts by mass of a total of the isobutylene-based copolymer (A) containing a halogen atom and the ethylene-vinyl alcohol copolymer (B). Such a resin composition is excellent in gas barrier properties and flexibility and stably produced over a long period of time.Type: GrantFiled: November 2, 2016Date of Patent: April 28, 2020Assignee: KURARAY CO., LTD.Inventors: Wataru Hirose, Takeyuki Igarashi
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Patent number: 10519303Abstract: Provided is a resin composition, comprising: an ethylene-vinyl alcohol copolymer (A); an isobutylene-based copolymer (B) containing a halogen atom; and a halogen scavenger (C), wherein a mass ratio (B/A) of the isobutylene-based copolymer (B) to the ethylene-vinyl alcohol copolymer (A) is from 5/95 to 45/55, and a content of the halogen scavenger (C) is from 0.01 to 1 part by mass based on 100 parts by mass of a total of the ethylene-vinyl alcohol copolymer (A) and the isobutylene-based copolymer (B). Such a resin composition is excellent in gas barrier properties and flexibility and stably produced over a long period of time.Type: GrantFiled: November 2, 2016Date of Patent: December 31, 2019Assignee: KURARAY CO., LTD.Inventors: Takeyuki Igarashi, Wataru Hirose
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Publication number: 20190248115Abstract: Provided is a fuel container composed of a multilayer structure containing: an ethylene-vinyl alcohol copolymer (A) layer; an adhesive resin (B) layer; a high-density polyethylene (C) layer; and a resin composition (D) layer, wherein the ethylene-vinyl alcohol copolymer (A) contains 15 to 44 mol % of ethylene, the adhesive resin (B) is a maleic anhydride-modified polyolefin having an acid value of 0.1 to 10 mgKOH/g and containing 1 to 8.5 ?mol/g of magnesium element, calcium element, zinc element, or a combination thereof, the resin composition (D) contains the ethylene-vinyl alcohol copolymer (A), the adhesive resin (B), and the high-density polyethylene (C), the thickness of the (A) layer, the (B) layer, and the (C) layer satisfies specific conditions, and the ethylene-vinyl alcohol copolymer (A), the adhesive resin (B), and the high-density polyethylene (C) satisfies specific conditions. The fuel container is excellent in fuel barrier properties and impact resistance and enables stable production.Type: ApplicationFiled: June 29, 2017Publication date: August 15, 2019Applicant: KURARAY CO., LTD.Inventors: Takeyuki IGARASHI, Shogo NAKAZAWA
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Patent number: 10329411Abstract: A resin composition, containing: (A) polyolefin; (B) a saponified ethylene-vinyl acetate copolymer having an ethylene content of from 20 to 65 mol % and a degree of saponification of vinyl acetate units of 96% or more; (C) a saponified ethylene-vinyl acetate copolymer having an ethylene content of from 68 to 98 mol % and a degree of saponification of vinyl acetate units of 20% or more; (D) a random copolymer consisting of ethylene and vinyl acetate; (E) a pigment comprising titanium oxide particles comprising a surface coated with a compound of a metal other than titanium or a silicon compound; and (I) a lubricant; wherein a mass ratio (AB) is from 3 to 99.5, a mass ratio (B/C) is from 1 to 100, a mass ratio of (D/C) is from 0.1 to 15, a mass ratio (E/C) is from 0.04 to 50, and a content of (C) is from 0.01 to 2.4 parts, particularly 0.33 to 1.5 parts, by mass based on 100 parts by mass of (A) and (B).Type: GrantFiled: March 25, 2011Date of Patent: June 25, 2019Assignee: KURARAY CO., LTD.Inventors: Takeyuki Igarashi, Yasuhiko Haneda, Masahiro Kitamura, Shinji Tai
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Patent number: 10246537Abstract: A resin composition according to an aspect of the present invention comprises: an ethylene-vinyl alcohol copolymer (A); and a block copolymer (B) having a block (b1) that includes a vinyl aromatic monomer unit, and a block (b2) that includes an isobutylene unit, wherein the ethylene-vinyl alcohol copolymer (A) and the block copolymer (B) form a co-continuous phase structure; and a DSC curve obtained following heating the resin composition up to a melting point and cooling at a rate of 50° C./min in a differential scanning calorimetry analysis shows two peaks, with a higher peak top temperature falling within a range of 130° C. or greater and 170° C. or less, and a lower peak top temperature falling within a range of 100° C. or greater and less than 130° C. A resin composition may thus be obtained that is able to give a molded article that is superior in balance between gas barrier properties and flexibility.Type: GrantFiled: August 19, 2015Date of Patent: April 2, 2019Assignee: KURARAY CO., LTD.Inventors: Wataru Hirose, Takeyuki Igarashi
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Publication number: 20180327578Abstract: Provided is a resin composition, comprising: an ethylene-vinyl alcohol copolymer (A); an isobutylene-based copolymer (B) containing a halogen atom; and a halogen scavenger (C), wherein a mass ratio (B/A) of the isobutylene-based copolymer (B) to the ethylene-vinyl alcohol copolymer (A) is from 5/95 to 45/55, and a content of the halogen scavenger (C) is from 0.01 to 1 part by mass based on 100 parts by mass of a total of the ethylene-vinyl alcohol copolymer (A) and the isobutylene-based copolymer (B). Such a resin composition is excellent in gas barrier properties and flexibility and stably produced over a long period of time.Type: ApplicationFiled: November 2, 2016Publication date: November 15, 2018Applicant: KURARAY CO., LTD.Inventors: Takeyuki IGARASHI, Wataru HIROSE
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Publication number: 20180319972Abstract: Provided is a resin composition, comprising: an isobutylene-based copolymer (A) containing a halogen atom; an ethylene-vinyl alcohol copolymer (B); and a halogen scavenger (C), wherein a mass ratio (B/A) of the ethylene-vinyl alcohol copolymer (B) to the isobutylene-based copolymer (A) containing a halogen atom is from 20/80 to 50/50, and a content of the halogen scavenger (C) is from 0.01 to 1 part by mass based on 100 parts by mass of a total of the isobutylene-based copolymer (A) containing a halogen atom and the ethylene-vinyl alcohol copolymer (B). Such a resin composition is excellent in gas barrier properties and flexibility and stably produced over a long period of time.Type: ApplicationFiled: November 2, 2016Publication date: November 8, 2018Applicant: KURARAY CO., LTD.Inventors: Wataru HIROSE, Takeyuki IGARASHI
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Publication number: 20180148528Abstract: A resin composition according to an aspect of the present invention comprises: an ethylene-vinyl alcohol copolymer (A); and a block copolymer (B) having a block (b1) that includes a vinyl aromatic monomer unit, and a block (b2) that includes an isobutylene unit, wherein the ethylene-vinyl alcohol copolymer (A) and the block copolymer (B) form a co-continuous phase structure; and a DSC curve obtained following heating the resin composition up to a melting point and cooling at a rate of 50° C./min in a differential scanning calorimetry analysis shows two peaks, with a higher peak top temperature falling within a range of 130° C. or greater and 170° C. or less, and a lower peak top temperature falling within a range of 100° C. or greater and less than 130° C. A resin composition may thus be obtained that is able to give a molded article that is superior in balance between gas barrier properties and flexibility.Type: ApplicationFiled: August 19, 2015Publication date: May 31, 2018Applicant: KURARAY CO., LTD.Inventors: Wataru HIROSE, Takeyuki IGARASHI
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Publication number: 20170275403Abstract: A resin composition according to an aspect of the present invention comprises: an ethylene-vinyl alcohol copolymer (A); and a block copolymer (B) having a block (b1) that includes a vinyl aromatic monomer unit, and a block (b2) that includes an isobutylene unit, wherein the ethylene-vinyl alcohol copolymer (A) and the block copolymer (B) form a co-continuous phase structure; and a DSC curve obtained following heating the resin composition up to a melting point and cooling at a rate of 50° C./min in a differential scanning calorimetry analysis shows two peaks, with a higher peak top temperature falling within a range of 130° C. or greater and 170° C. or less, and a lower peak top temperature falling within a range of 100° C. or greater and less than 130° C. A resin composition may thus be obtained that is able to give a molded article that is superior in balance between gas barrier properties and flexibility.Type: ApplicationFiled: August 19, 2015Publication date: September 28, 2017Applicant: KURARAY CO., LTD.Inventors: Wataru HIROSE, Takeyuki IGARASHI
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Patent number: 9457545Abstract: Provided is a method of producing a multilayered structure, comprising the steps of: obtaining a regrind (C) by grinding a multilayered structure (B) having a layer of a resin composition (A), followed by sieving; and obtaining a multilayered structure (F) having a layer of a resin composition (E) made by melt kneading the regrind (C) and a polyolefin (D), wherein the resin composition (A) contains a polyolefin (G), a saponified ethylene-vinyl acetate copolymer (H) having an ethylene content of from 20 to 65 mol % and having a degree of saponification of vinyl acetate units of 96% or more, a saponified ethylene-vinyl acetate copolymer (I) having an ethylene content of from 68 to 98 mol % and having a degree of saponification of vinyl acetate units of 20% or more, and an antistatic agent (J), and a mass ratio (H/I) is from 0.1 to 10.Type: GrantFiled: April 27, 2011Date of Patent: October 4, 2016Assignee: KURARAY CO., LTD.Inventors: Takeyuki Igarashi, Yasuhiko Haneda, Masahiro Kitamura
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Patent number: 9074088Abstract: Laminates in which a layer of a polar resin (C) is laminated with a layer of a polyolefin (D) or a recovered resin (E) via a layer of an adhesive resin composition (A), including an ethylene-vinyl alcohol copolymer, the adhesive resin composition (A) is produced by mixing a resin having an unsaturated carboxylic acid anhydride or derivative thereof (a1) with a ring-opening polymer or condensation polymer (a2) having a hydroxyl group or an amino group at both ends or at one end; or partially grafting the (a2) with the (a1).Type: GrantFiled: March 28, 2008Date of Patent: July 7, 2015Assignee: Kuraray Co., Ltd.Inventors: Takeyuki Igarashi, Kaoru Ikeda, Tomoyuki Watanabe
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Patent number: 8784960Abstract: A multilayer structure, comprising: a layer of a resin composition (A); a layer of a saponified ethylene-vinyl acetate copolymer (B); and a layer of polyolefin (C) arranged on one side or both sides of those layers, wherein the resin composition (A) contains polyolefin (D), a saponified ethylene-vinyl acetate copolymer (E) and a saponified ethylene-vinyl acetate copolymer (F1) and/or an acid-modified ethylene-vinyl acetate copolymer (F2), the copolymer (E) has a mass ratio [E/(F1+F2)] of from 0.05 to 30, the polyolefin (D) has the copolymer (E) having an average particle diameter of from 0.1 to 1.8 ?m dispersed in a matrix thereof, the layers of (A) and of (C) have thicknesses of from 50 to 1000 ?m, and from 25 to 1000 ?m, respectively, which enables provision of a multilayer structure having good gas barrier properties after retort processing and a good appearance.Type: GrantFiled: March 30, 2011Date of Patent: July 22, 2014Assignee: Kuraray Co., Ltd.Inventors: Takeyuki Igarashi, Yasuhiko Haneda, Masahiro Kitamura
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Patent number: 8759447Abstract: A compatibilizer contains a polymer (A) obtained by reacting a modified olefin-based polymer (a-1) with a polymer (a-2) containing a terminal functional group, wherein the modified olefin-based polymer (a-1) is a polymer modified with from 0.01 to 2 mass % of unsaturated carboxylic acid or a derivative thereof, and the polymer (a-2) is a ring opening polymer or condensation polymer containing a terminal functional group, capable of reacting with the modified olefin-based polymer (a-1), at both ends or one end thereof and has a number average molecular weight from 1,500 to 100,000. This provides an excellent compatibilizer. Particularly, upon melt processing a recovery of a multilayer structure including an EVOH layer and a thermoplastic resin layer, a recycling agent is provided that gives sufficient improvement effects to any of the adhesion of a degraded resin to a screw of a molding machine, the generation of die build-up, the generation of fish eyes, and the decrease in transparency.Type: GrantFiled: September 30, 2010Date of Patent: June 24, 2014Assignee: Kuraray Co., Ltd.Inventors: Takeyuki Igarashi, Shinji Tai, Tomoyuki Watanabe
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Publication number: 20130244048Abstract: A resin composition, containing: (A) polyolefin; (B) a saponified ethylene-vinyl acetate copolymer having an ethylene content of from 20 to 65 mol % and a degree of saponification of vinyl acetate units of 96% or more; (C) a saponified ethylene-vinyl acetate copolymer having an ethylene content of from 68 to 98 mol % and a degree of saponification of vinyl acetate units of 20% or more; and a pigment (E), wherein a mass ratio (A/B) is from 3 to 99.5, a mass ratio (B/C) is from 1 to 100, a mass ratio (E/C) is from 0.04 to 50, and a content of (C) is from 0.01 to 2.4 parts by mass based on 100 parts by mass of (A) and (B). A molded product, in particular a multilayered structure, obtained by melt molding the resin composition has good dispersibility of the pigment, and improved uneven coloration.Type: ApplicationFiled: March 25, 2011Publication date: September 19, 2013Applicant: KURARAY CO., LTD.Inventors: Takeyuki Igarashi, Yasuhiko Haneda, Masahiro Kitamura, Shinji Tai
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Publication number: 20130225756Abstract: Provided is a resin mixture, comprising: polyolefin (A); a saponified ethylene-vinyl acetate copolymer (B); and an acid modified olefin-vinyl carboxylate copolymer (C), wherein the acid modified olefin-vinyl carboxylate copolymer (C) has an olefin content of from 50 to 95 mol %, and a difference between an ethylene content of the saponified ethylene-vinyl acetate copolymer (B) and the olefin content of the acid modified olefin-vinyl carboxylate copolymer (C) is within a range of from 20 to 70 mol %. This enables to provide a resin mixture that contains polyolefin and an EVOH, and even in continuous melt molding over a long period of time, has a less amount of screw buildup of a degraded material and also is reduced in generation of fish-eyes, cords, and streaks in a molded product obtained therefrom.Type: ApplicationFiled: November 1, 2011Publication date: August 29, 2013Applicant: KURARAY CO., LTD.Inventors: Takeyuki Igarashi, Shinji Tai
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Publication number: 20130037980Abstract: Provided is a method of producing a multilayered structure, comprising the steps of: obtaining a regrind (C) by grinding a multilayered structure (B) having a layer of a resin composition (A), followed by sieving; and obtaining a multilayered structure (F) having a layer of a resin composition (E) made by melt kneading the regrind (C) and a polyolefin (D), wherein the resin composition (A) contains a polyolefin (G), a saponified ethylene-vinyl acetate copolymer (H) having an ethylene content of from 20 to 65 mol % and having a degree of saponification of vinyl acetate units of 96% or more, a saponified ethylene-vinyl acetate copolymer (I) having an ethylene content of from 68 to 98 mol % and having a degree of saponification of vinyl acetate units of 20% or more, and an antistatic agent (J), and a mass ratio (H/I) is from 0.1 to 10.Type: ApplicationFiled: April 27, 2011Publication date: February 14, 2013Inventors: Takeyuki Igarashi, Yasuhiko Haneda, Masahiro Kitamura
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Publication number: 20130040157Abstract: A resin composition, containing: (A) polyolefin; (B) a saponified ethylene-vinyl acetate copolymer having an ethylene content of from 20 to 65 mol % and a degree of saponification of vinyl acetate units of 96% or more; (C) a saponified ethylene-vinyl acetate copolymer having an ethylene content of from 68 to 98 mol % and a degree of saponification of vinyl acetate units of 20% or more; and a pigment (E), wherein a mass ratio (A/B) is from 3 to 99.5, a mass ratio (B/C) is from 1 to 100, a mass ratio (E/C) is from 0.04 to 50, and a content of (C) is from 0.01 to 2.4 parts by mass based on 100 parts by mass of (A) and (B). A molded product, in particular a multilayered structure, obtained by melt molding the resin composition has good dispersibility of the pigment, and improved uneven coloration.Type: ApplicationFiled: March 25, 2011Publication date: February 14, 2013Applicant: KURARAY CO., LTD.Inventors: Takeyuki Igarashi, Yasuhiko Haneda, Masahiro Kitamura, Shinji Tai
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Publication number: 20130022768Abstract: Provided is a multilayer structure, comprising: a layer of a resin composition (A); a layer of a saponified ethylene-vinyl acetate copolymer (B) having an ethylene content of from 20 to 65 mol % and having a degree of saponification of vinyl acetate units of 96% or more; and a layer of polyolefin (C) arranged on one side or both sides of those layers, wherein the resin composition (A) contains polyolefin (D), a saponified ethylene-vinyl acetate copolymer (E) having an ethylene content of from 20 to 65 mol % and having a degree of saponification of vinyl acetate units of 96% or more, and a saponified ethylene-vinyl acetate copolymer (F1) having an ethylene content of from 68 to 98 mol % and having a degree of saponification of vinyl acetate units of 20% or more and/or an acid-modified ethylene-vinyl acetate copolymer (F2) having an ethylene content of from 68 to 98 mol %, the saponified ethylene-vinyl acetate copolymer (E) has a mass ratio [E/(F1+F2)] of from 0.Type: ApplicationFiled: March 30, 2011Publication date: January 24, 2013Applicant: KURARAY CO., LTD.Inventors: Takeyuki Igarashi, Yasuhiko Haneda, Masahiro Kitamura