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).
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Patent number: 11931700Abstract: A substrate for a liquid filter contains a polyolefin microporous membrane. 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: GrantFiled: March 23, 2018Date of Patent: March 19, 2024Assignee: TEIJIN LIMITEDInventors: Ayumi Iwai, Koji Furuya, Takao Ohno
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Publication number: 20210308633Abstract: 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: ApplicationFiled: July 23, 2019Publication date: October 7, 2021Applicant: TEIJIN LIMITEDInventors: Ayumi IWAI, Koji FURUYA, Yu NAGAO, Yoshikazu IKUTA
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Patent number: 10115948Abstract: 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: GrantFiled: October 19, 2012Date of Patent: October 30, 2018Assignee: TEIJIN LIMITEDInventors: Satoshi Nishikawa, Takashi Yoshitomi, Atsuhiro Otsuka, Ayumi Iwai
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Patent number: 10096811Abstract: 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: GrantFiled: October 19, 2012Date of Patent: October 9, 2018Assignee: TEIJIN LIMITEDInventors: Satoshi Nishikawa, Takashi Yoshitomi, Atsuhiro Otsuka, Ayumi Iwai
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Publication number: 20180280894Abstract: 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: ApplicationFiled: March 23, 2018Publication date: October 4, 2018Applicant: TEIJIN LIMITEDInventors: Ayumi IWAI, Koji FURUYA, Takao OHNO
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Patent number: 9882189Abstract: 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: GrantFiled: July 30, 2013Date of Patent: January 30, 2018Assignee: TEIJIN LIMITEDInventors: Ayumi Iwai, Satoshi Nishikawa, Takashi Yoshitomi
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Patent number: 9799868Abstract: 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: GrantFiled: October 19, 2012Date of Patent: October 24, 2017Assignee: TEIJIN LIMITEDInventors: Ayumi Iwai, Takashi Yoshitomi, Satoshi Nishikawa
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Patent number: 9755208Abstract: 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: GrantFiled: March 5, 2014Date of Patent: September 5, 2017Assignee: TEIJIN LIMITEDInventors: Ayumi Iwai, Takashi Yoshitomi, Satoshi Nishikawa
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Patent number: 9431638Abstract: 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: GrantFiled: October 19, 2012Date of Patent: August 30, 2016Assignee: TEIJIN LIMITEDInventors: Satoshi Nishikawa, Takashi Yoshitomi, Atsuhiro Otsuka, Ayumi Iwai
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Publication number: 20150380707Abstract: 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: ApplicationFiled: March 5, 2014Publication date: December 31, 2015Applicant: TEIJIN LIMITEDInventors: Ayumi IWAI, Takashi YOSHITOMI, Satoshi NISHIKAWA
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Publication number: 20150318528Abstract: 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: ApplicationFiled: March 5, 2014Publication date: November 5, 2015Applicant: TEIJIN LIMITEDInventors: Ayumi IWAI, Takashi YOSHITOMI, Satoshi NISHIKAWA
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Publication number: 20150179997Abstract: 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: ApplicationFiled: July 30, 2013Publication date: June 25, 2015Applicant: TEIJIN LIMITEDInventors: Ayumi Iwai, Satoshi Nishikawa, Takashi Yoshitomi
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Publication number: 20140315068Abstract: 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: ApplicationFiled: October 19, 2012Publication date: October 23, 2014Applicant: TEIJIN LIMITEDInventors: Satoshi Nishikawa, Takashi Yoshitomi, Atsuhiro Otsuka, Ayumi Iwai
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Publication number: 20140308567Abstract: 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: ApplicationFiled: October 19, 2012Publication date: October 16, 2014Applicant: TEIJIN LIMITEDInventors: Satoshi Nishikawa, Takashi Yoshitomi, Atsuhiro Otsuka, Ayumi Iwai
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Publication number: 20140255754Abstract: 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: ApplicationFiled: October 19, 2012Publication date: September 11, 2014Applicant: TEIJIN LIMITEDInventors: Satoshi Nishikawa, Takashi Yoshitomi, Atsuhiro Otsuka, Ayumi Iwai
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Publication number: 20140248525Abstract: 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: ApplicationFiled: October 19, 2012Publication date: September 4, 2014Applicant: TEIJIN LIMITEDInventors: Ayumi Iwai, Takashi Yoshitomi, Satoshi Nishikawa
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Publication number: 20140242444Abstract: 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: ApplicationFiled: October 19, 2012Publication date: August 28, 2014Applicant: TEIJIN LIMITEDInventors: Satoshi Nishikawa, Takashi Yoshitomi, Atsuhiro Otsuka, Ayumi Iwai