Patents by Inventor Ayumi Iwai

Ayumi Iwai 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: 20210308633
    Abstract: The present disclosure provides a substrate for a liquid filter, including: a polyolefin microporous membrane, in which a mean flow pore size in a pore size distribution of the polyolefin microporous membrane measured by a half dry method according to gas-liquid phase substitution is from 1 nm to 50 nm, a calcium content in the polyolefin microporous membrane is 2,000 ppb or less, and a ratio of a tensile elongation in a longitudinal direction (MD) to a tensile elongation in a width direction (TD) perpendicular to the longitudinal direction (MD/TD tensile elongation ratio) of the polyolefin microporous membrane is from 0.47 to less than 0.96 or from more than 1.25 to 7.
    Type: Application
    Filed: July 23, 2019
    Publication date: October 7, 2021
    Applicant: TEIJIN LIMITED
    Inventors: Ayumi IWAI, Koji FURUYA, Yu NAGAO, Yoshikazu IKUTA
  • Patent number: 10115948
    Abstract: The present invention provides a separator for a non-aqueous secondary battery including a porous substrate, and an adhesive porous layer that is formed at one or both sides of the porous substrate, that contains polyvinylidene fluoride resin A and polyvinylidene fluoride resin B, and that has a porosity of from 30% to 60% and an average pore size of from 20 nm to 100 nm.
    Type: Grant
    Filed: October 19, 2012
    Date of Patent: October 30, 2018
    Assignee: TEIJIN LIMITED
    Inventors: Satoshi Nishikawa, Takashi Yoshitomi, Atsuhiro Otsuka, Ayumi Iwai
  • Patent number: 10096811
    Abstract: A separator for a non-aqueous secondary battery including a porous substrate, and an adhesive porous layer that is formed on one side or both sides of the porous substrate and contains the following resin A and the following resin B. Resin A: a polyvinylidene fluoride resin containing structural units derived from vinylidene fluoride (VDF) and structural units derived from hexafluoropropylene (HFP), a total content ratio of structural units derived from HFP in each of the VDF copolymers being from 0.5 mol % to 1.5 mol % of a total content of structural units in each of the VDF copolymers; and Resin B: a polyvinylidene fluoride resin containing structural units derived from VDF and structural units derived from HFP, a total content ratio of structural units derived from HFP in each of the VDF copolymers being greater than 1.5 mol % of a total content of structural units in each of the VDF copolymers.
    Type: Grant
    Filed: October 19, 2012
    Date of Patent: October 9, 2018
    Assignee: TEIJIN LIMITED
    Inventors: Satoshi Nishikawa, Takashi Yoshitomi, Atsuhiro Otsuka, Ayumi Iwai
  • Publication number: 20180280894
    Abstract: A substrate for a liquid filter that contains a polyolefin microporous membrane, in which a mean flow pore size dpp in a pore size distribution of the polyolefin microporous membrane measured by a half dry method according to gas-liquid phase substitution is from 1 nm to 20 nm, a mean flow pore size dLLP in a pore size distribution of the polyolefin microporous membrane measured by a half dry method according to liquid-liquid phase substitution is from 1 nm to 15 nm, a difference (dpp-dLLP) between the mean flow pore size dpp and the mean flow pore size dLLP is 12 nm or less, and a thickness of the polyolefin microporous membrane is from 4 to 25 ?m.
    Type: Application
    Filed: March 23, 2018
    Publication date: October 4, 2018
    Applicant: TEIJIN LIMITED
    Inventors: Ayumi IWAI, Koji FURUYA, Takao OHNO
  • Patent number: 9882189
    Abstract: Provided is a separator for a nonaqueous electrolyte battery, which includes a porous substrate and an adhesive porous layer that is provided on at least one side of the porous substrate and contains an adhesive resin. The separator has a pore size distribution such that, as measured by a pore size distribution measurement test, the pore size at the maximum value of the maximum peak is within a range of 0.02 ?m to 0.1 ?m, and the pore size distribution range value ? defined as follows is 0.4 or less. The pore size distribution range value ? herein is a value calculated by the following equation from pore sizes D90, D10, and D50 corresponding to cumulative pore size distributions of 90%, 10%, and 50%, respectively: pore size distribution range value ?=(D90?D10 )/D50.
    Type: Grant
    Filed: July 30, 2013
    Date of Patent: January 30, 2018
    Assignee: TEIJIN LIMITED
    Inventors: Ayumi Iwai, Satoshi Nishikawa, Takashi Yoshitomi
  • Patent number: 9799868
    Abstract: A separator for a non-aqueous secondary battery includes a porous substrate and an adhesive porous layer provided on one or both sides of the porous substrate, the adhesive porous layer including a polyvinylidene-fluoride resin and a filler whose difference between a particle diameter at 90% cumulative volume and a particle diameter at 10% cumulative volume is 2 ?m or less, and the adhesive porous layer satisfying Inequality (1): 0.5?a/r?3.0, wherein, in Inequality (1), “a” represents an average thickness (?m) of the adhesive porous layer on one of the sides of the porous substrate; and “r” represents a volume average particle diameter (?m) of the filler contained in the adhesive porous layer.
    Type: Grant
    Filed: October 19, 2012
    Date of Patent: October 24, 2017
    Assignee: TEIJIN LIMITED
    Inventors: Ayumi Iwai, Takashi Yoshitomi, Satoshi Nishikawa
  • Patent number: 9755208
    Abstract: Provided is a non-aqueous-secondary-battery separator including: a microporous membrane; and an adhesive porous layer which is provided on one or both surfaces of the microporous membrane and includes a fibrillar polyvinylidene fluoride resin, in which an average hole diameter acquired from the specific surface area of the microporous membrane is greater than 90 nm and equal to or smaller than 250 nm, peeling strength between the microporous membrane and the adhesive porous layer is equal to or greater than 0.10 N/cm, and a fibrillar diameter acquired from the specific surface area of the adhesive porous layer is from 50 nm to 70 nm.
    Type: Grant
    Filed: March 5, 2014
    Date of Patent: September 5, 2017
    Assignee: TEIJIN LIMITED
    Inventors: Ayumi Iwai, Takashi Yoshitomi, Satoshi Nishikawa
  • Patent number: 9431638
    Abstract: The present invention provides a separator for a non-aqueous secondary battery including a porous substrate and an adhesive porous layer that is formed at at least one side of the porous substrate and contains the following polyvinylidene fluoride-based resin A and the following polyvinylidene fluoride-based resin B. (1) Polyvinylidene fluoride resin A selected from the group consisting of vinylidene fluoride homopolymers having a weight average molecular weight of from 600,000 to 2,500,000, and vinylidene fluoride copolymers having a weight average molecular weight of from 600,000 to 2,500,000 and containing a structural unit derived from vinylidene fluoride and a structural unit derived from hexafluoropropylene, the total content of structural units derived from hexafluoropropylene in each of the vinylidene fluoride copolymers being 1.5 mol % or less of the total content of structural units in each of the vinylidene fluoride copolymer.
    Type: Grant
    Filed: October 19, 2012
    Date of Patent: August 30, 2016
    Assignee: TEIJIN LIMITED
    Inventors: Satoshi Nishikawa, Takashi Yoshitomi, Atsuhiro Otsuka, Ayumi Iwai
  • Publication number: 20150380707
    Abstract: Provided is a non-aqueous-secondary-battery separator including: a microporous membrane; and an adhesive porous layer which is provided on one or both surfaces of the microporous membrane and includes a fibrillar polyvinylidene fluoride resin, in which an average hole diameter acquired from the specific surface area of the microporous membrane is greater than 90 nm and equal to or smaller than 250 nm, peeling strength between the microporous membrane and the adhesive porous layer is equal to or greater than 0.10 N/cm, and a fibrillar diameter acquired from the specific surface area of the adhesive porous layer is from 50 nm to 70 nm.
    Type: Application
    Filed: March 5, 2014
    Publication date: December 31, 2015
    Applicant: TEIJIN LIMITED
    Inventors: Ayumi IWAI, Takashi YOSHITOMI, Satoshi NISHIKAWA
  • Publication number: 20150318528
    Abstract: Provided is a non-aqueous-secondary-battery separator including: a microporous membrane containing a fibrillar resin; and an adhesive porous layer which is provided on one or both surfaces of the microporous membrane and contains a fibrillar polyvinylidene fluoride resin, in which an average pore diameter acquired from a specific surface area of the microporous membrane is from 50 nm to 90 nm or a fibrillar diameter acquired from a specific surface area of the microporous membrane is from 150 nm to 350 nm.
    Type: Application
    Filed: March 5, 2014
    Publication date: November 5, 2015
    Applicant: TEIJIN LIMITED
    Inventors: Ayumi IWAI, Takashi YOSHITOMI, Satoshi NISHIKAWA
  • Publication number: 20150179997
    Abstract: Provided is a separator for a nonaqueous electrolyte battery, which includes a porous substrate and an adhesive porous layer that is provided on at least one side of the porous substrate and contains an adhesive resin. The separator has a pore size distribution such that, as measured by a pore size distribution measurement test, the pore size at the maximum value of the maximum peak is within a range of 0.02 ?m to 0.1 ?m, and the pore size distribution range value ? defined as follows is 0.4 or less. The pore size distribution range value ? herein is a value calculated by the following equation from pore sizes D90, D10, and D50 corresponding to cumulative pore size distributions of 90%, 10%, and 50%, respectively: pore size distribution range value ?=(D90?D10)/D50.
    Type: Application
    Filed: July 30, 2013
    Publication date: June 25, 2015
    Applicant: TEIJIN LIMITED
    Inventors: Ayumi Iwai, Satoshi Nishikawa, Takashi Yoshitomi
  • Publication number: 20140315068
    Abstract: The present invention provides a separator for a non-aqueous secondary battery, including a porous substrate and an adhesive porous layer that is formed at at least one side of the porous substrate and contains the following polyvinylidene fluoride-based resin A and the following polyvinylidene fluoride-based resin B. (1) Polyvinylidene fluoride resin A selected from the group consisting of vinylidene fluoride homopolymers, and vinylidene fluoride copolymers containing a structural unit derived from vinylidene fluoride and a structural unit derived from hexafluoropropylene, the total content of structural units derived from hexafluoropropylene in each of the vinylidene fluoride copolymers being 1.5 mol % or less of the total content of structural units in each of the vinylidene fluoride copolymer.
    Type: Application
    Filed: October 19, 2012
    Publication date: October 23, 2014
    Applicant: TEIJIN LIMITED
    Inventors: Satoshi Nishikawa, Takashi Yoshitomi, Atsuhiro Otsuka, Ayumi Iwai
  • Publication number: 20140308567
    Abstract: The present invention provides a separator for a non-aqueous secondary battery including a porous substrate and an adhesive porous layer that is formed at at least one side of the porous substrate and contains the following polyvinylidene fluoride-based resin A and the following polyvinylidene fluoride-based resin B. (1) Polyvinylidene fluoride resin A selected from the group consisting of vinylidene fluoride homopolymers having a weight average molecular weight of from 600,000 to 2,500,000, and vinylidene fluoride copolymers having a weight average molecular weight of from 600,000 to 2,500,000 and containing a structural unit derived from vinylidene fluoride and a structural unit derived from hexafluoropropylene, the total content of structural units derived from hexafluoropropylene in each of the vinylidene fluoride copolymers being 1.5 mol % or less of the total content of structural units in each of the vinylidene fluoride copolymer.
    Type: Application
    Filed: October 19, 2012
    Publication date: October 16, 2014
    Applicant: TEIJIN LIMITED
    Inventors: Satoshi Nishikawa, Takashi Yoshitomi, Atsuhiro Otsuka, Ayumi Iwai
  • Publication number: 20140255754
    Abstract: The present invention provides a separator for a non-aqueous secondary battery including a porous substrate, and an adhesive porous layer that is formed at one or both sides of the porous substrate, contains (1) polyvinylidene fluoride resin A and (2) polyvinylidene fluoride resin B described below, and has a porosity of from 30% to 60% and an average pore size of from 20 nm to 100 nm: (1) polyvinylidene fluoride resin A is selected from the group consisting of vinylidene fluoride homopolymers and DVF copolymers containing structural units derived from vinylidene fluoride (VDF) and structural units derived from hexafluoropropylene (HFP), a total content of structural unit derived from HFP in each of the VDF copolymers being 1.
    Type: Application
    Filed: October 19, 2012
    Publication date: September 11, 2014
    Applicant: TEIJIN LIMITED
    Inventors: Satoshi Nishikawa, Takashi Yoshitomi, Atsuhiro Otsuka, Ayumi Iwai
  • Publication number: 20140248525
    Abstract: A separator for a non-aqueous secondary battery includes a porous substrate and an adhesive porous layer provided on one or both sides of the porous substrate, the adhesive porous layer including a polyvinylidene-fluoride resin and a filler whose difference between a particle diameter at 90% cumulative volume and a particle diameter at 10% cumulative volume is 2 ?m or less, and the adhesive porous layer satisfying Inequality (1): 0.5?a/r?3.0, wherein, in Inequality (1), “a” represents an average thickness (?m) of the adhesive porous layer on one of the sides of the porous substrate; and “r” represents a volume average particle diameter (?m) of the filler contained in the adhesive porous layer.
    Type: Application
    Filed: October 19, 2012
    Publication date: September 4, 2014
    Applicant: TEIJIN LIMITED
    Inventors: Ayumi Iwai, Takashi Yoshitomi, Satoshi Nishikawa
  • Publication number: 20140242444
    Abstract: A separator for a non-aqueous secondary battery including a porous substrate, and an adhesive porous layer that is formed on one side or both sides of the porous substrate and contains the following polyvinylidene fluoride resin A and the following polyvinylidene fluoride resin B: Polyvinylidene fluoride resin A: a polyvinylidene fluoride resin containing structural units derived from vinylidene fluoride and structural units derived from hexafluoropropylene, a total content ratio of structural units derived from hexafluoropropylene in each of the vinylidene fluoride copolymers being from 0.5 mol % to 1.
    Type: Application
    Filed: October 19, 2012
    Publication date: August 28, 2014
    Applicant: TEIJIN LIMITED
    Inventors: Satoshi Nishikawa, Takashi Yoshitomi, Atsuhiro Otsuka, Ayumi Iwai