公开(公告)号：US11447881B2

公开(公告)日：2022-09-20

申请号：US15491272

申请日：2017-04-19

Applicant: AGC Inc.

Inventor： Yasushi Yamaki ,  Takayuki Kaneko ,  Hiromitsu Kusano ,  Takuo Nishio ,  Kazuo Umemura

IPC: C25B1/46 ,  C25B13/08 ,  B01D69/10 ,  C25B9/23 ,  B01D71/32 ,  C08J5/22 ,  B01D71/82

Abstract: To provide an ion exchange membrane for alkali chloride electrolysis for which membrane strength is increased while membrane resistance is reduced to reduce electrolysis voltage during alkali chloride electrolysis and which prevents peeling between layers (S) and a layer (C). The ion exchange membrane for alkali chloride electrolysis comprises a layer (C) which comprises a fluorinated polymer having carboxylic acid functional groups, at least two layers (S) which comprise a fluorinated polymer having sulfonic acid functional groups, and a reinforcing material, wherein the layers (S) include a layer (Sa) and a layer (Sb), the layer (Sa) is a layer which is adjacent to the layer (C), the layer (Sb) is a layer which is not adjacent to the layer (C), the reinforcing material is disposed in the layer (Sb) substantially in parallel to the layer (Sb) in a state not in contact with the layer (Sa), and the ion exchange capacity of the layer (Sa) is lower than the ion exchange capacity of the layer (Sb).

公开(公告)号：US11434337B2

公开(公告)日：2022-09-06

申请号：US15654124

申请日：2017-07-19

Applicant: AGC Inc.

Inventor： Takayuki Kaneko ,  Hiromitsu Kusano ,  Yasushi Yamaki ,  Takuo Nishio

IPC: C08J5/22 ,  C25B13/08 ,  C25B13/02 ,  B01J39/20 ,  B01J47/12 ,  C01B7/03 ,  C25B9/00 ,  C25B1/46

Abstract: To provide an ion exchange membrane for alkali chloride electrolysis which has a low membrane resistance and which is capable of reducing the electrolysis voltage during the alkali chloride electrolysis, while increasing the membrane strength.
An ion exchange membrane 1 for alkali chloride electrolysis wherein a reinforcing material 20 obtained by weaving with reinforcing yarns 22 and sacrificial yarns 24 is embedded in a fluoropolymer having ion exchange groups, the ion exchange membrane 1 comprises elution holes (28) formed by eluting at least a portion of a material of the sacrificial yarns 24, and in a cross section perpendicular to the length direction of the yarns, the total area (S) obtained by adding the cross-sectional area of an elution hole 28 and the cross-sectional area of a sacrificial yarn 24 remaining in the elution hole 28 is from 500 to 1,200 μm2, and the number (n) of elution holes 28 between adjacent reinforcing yarns 22 is at least 10.

公开(公告)号：US11273435B2

公开(公告)日：2022-03-15

申请号：US15173916

申请日：2016-06-06

Applicant: AGC Inc.

Inventor： Hiromitsu Kusano ,  Takayuki Kaneko

IPC: B01J39/20 ,  C25B13/08 ,  B01J47/12 ,  C25B13/04 ,  C25B13/02

Abstract: To provide a method for producing a fluorinated cation exchange membrane, by which a fluorinated cation exchange membrane having a high effect to suppress attachment of the gas to the surface on the cathode side and having an excellent resistance to dropping of inorganic particles from a gas-releasing layer provided on the cathode side can be obtained.
A method for producing a fluorinated cation exchange membrane 1 for electrolysis comprising, on at least the cathode side, a layer (α1) 12 containing a perfluorocarbon polymer (A) having carboxylic acid groups or precursor groups of carboxylic acid groups, and a gas-releasing layer (α2) 10 provided on the cathode side of the layer (α1) 12, which comprises applying to the surface of the layer (α1) 12 a coating liquid containing inorganic particles having an average secondary particle size of from 0.5 to 1.5 μm, a binder and a dispersion medium in a mass ratio of the binder to the total mass of the inorganic particles and the binder of from 0.15 to 0.3, to form the gas-releasing layer (α2) 10.

公开(公告)号：US11020734B2

公开(公告)日：2021-06-01

申请号：US15491371

申请日：2017-04-19

Applicant: AGC Inc.

Inventor： Yasushi Yamaki ,  Takayuki Kaneko ,  Hiromitsu Kusano ,  Takuo Nishio

IPC: C25B13/08 ,  B01J39/05 ,  B01J39/20 ,  B01J47/12 ,  C08F214/26 ,  C08F216/14 ,  C25B9/10 ,  C08J5/22 ,  C25B9/23 ,  C25B1/46

Abstract: To provide an ion exchange membrane for alkali chloride electrolysis which has high membrane strength and low membrane resistance, thereby capable of reducing the electrolysis voltage during alkali chloride electrolysis. In this ion exchange membrane (1) for alkali chloride electrolysis, a reinforcing material 20 formed by weaving reinforcing yarns 22 and sacrificial yarns 24 is disposed in a layer (S) 14, and layer (S) 14 has elution portions 28 formed by elution of at least portions of the sacrificial yarns 24. In a cross section perpendicular to reinforcing yarns of the warp, the average distance (d1) from the center of a reinforcing yarn 22 to the center of the adjacent reinforcing yarn 22, the total area (P) obtained by adding the cross-sectional area of an elution portion 28 and the cross-sectional area of a sacrificial yarn 24 remaining in the elution portion 28, the number (n) of elution portions between adjacent reinforcing yarns 22, and the ion exchange capacity of a layer (Sa) located on the most anode side in the layer (S) 14 during alkali chloride electrolysis, are controlled to be within specific ranges, respectively.

公开(公告)号：US20190040538A1

公开(公告)日：2019-02-07

申请号：US16156360

申请日：2018-10-10

Applicant: AGC Inc.

Inventor： Yasushi Yamaki ,  Takayuki Kaneko ,  Hiromitsu Kusano ,  Takuo Nishio

IPC: C25B13/08 ,  C25B1/46 ,  C25B9/10 ,  B01J39/05 ,  B01J39/20 ,  B01J47/12

Abstract: To provide an ion exchange membrane for alkali chloride electrolysis which is a membrane having a high water permeability and being capable of maintaining a low electrolysis voltage while suppressing the amount of water supplied to a cathode chamber to be minimum, and which is capable of forming an aqueous alkali hydroxide solution having a high caustic alkali quality. The ion exchange membrane for alkali chloride electrolysis comprises a layer 12 made of a fluorinated polymer having carboxylic acid functional groups, and a layer 14A and a layer 14B made of a fluorinated polymer having sulfonic acid functional groups, wherein a reinforcing material 20 containing reinforcing threads 22 is disposed between the layer 14A and the layer 14B, the thickness when dried, of the layer 12 is from 9 to 28 μm, the layer 14B includes a layer having an ion exchange capacity of from 1.3 to 2.5 meq/g, the thickness when dried, of the layer 14B is from 6 to 100 μm, the layer 14A includes a layer having an ion exchange capacity of from 0.9 to 1.25 meq/g, and the thickness when dried, of the layer 14A is from 40 to 110 μm.

公开(公告)号：US10926253B2

公开(公告)日：2021-02-23

申请号：US15728694

申请日：2017-10-10

Applicant: AGC Inc.

Inventor： Takayuki Kaneko ,  Hiromitsu Kusano ,  Yasushi Yamaki ,  Takuo Nishio

IPC: B01J39/05 ,  B01J39/20 ,  B01J47/12 ,  C25B13/08 ,  D02G3/36 ,  D02G3/04 ,  B01J39/04 ,  C08J5/22 ,  C25B13/02 ,  C25B1/46 ,  C25B9/08

Abstract: To provide a process for producing an ion exchange membrane for electrolysis which has a low membrane resistance and which is capable of reducing the electrolysis voltage during the electrolysis, even if the membrane strength is increased, an ion exchange membrane for electrolysis, a precursor membrane of an ion exchange membrane for electrolysis, and an electrolysis apparatus.
In a fluorinated polymer having groups convertible to ion exchange groups, a reinforcing fabric 20A formed by weaving covered yarns 21 each comprising a reinforcing fabric 22 and a sacrificial material covering at least a portion of the outer peripheral surface of the reinforcing yarn 22, to produce a precursor membrane of an ion exchange membrane, and from the precursor membrane, at least a portion of the sacrificial material in the reinforcing fabric is eluted to form a reinforcing material and at the same time, the groups convertible to ion exchange groups are converted to ion exchange groups, to produce an ion exchange membrane for electrolysis.

公开(公告)号：US10669641B2

公开(公告)日：2020-06-02

申请号：US16156320

申请日：2018-10-10

Applicant: AGC Inc.

Inventor： Yasushi Yamaki ,  Takayuki Kaneko ,  Hiromitsu Kusano ,  Takuo Nishio

IPC: C25B13/08 ,  B01J39/20 ,  B01J47/12 ,  C25B1/46 ,  B01J39/05 ,  B01J39/07 ,  C25B9/10

Abstract: To provide an ion exchange membrane for alkali chloride electrolysis whereby it is possible to make the electrolysis voltage low and the current efficiency high at the time of performing electrolysis of an alkali chloride; a method for its production; and an alkali chloride electrolysis apparatus using it. The ion exchange membrane for alkali chloride electrolysis has a layer (C) comprising a fluorinated polymer having carbonic acid functional groups, and a layer (S) comprising a fluorinated polymer having sulfonic acid functional groups; a reinforcing material containing reinforcing threads is disposed in the layer (S); and when measured after the ion exchange membrane for alkali chloride electrolysis is immersed and held in a 32 mass % sodium hydroxide aqueous solution warmed at 90° C. for 16 hours and subsequently immersed in a 32 mass % sodium hydroxide aqueous solution at 25° C. for 3 hours, the AC resistance value A of the layer (S) and the AC resistance value B of the layer (C) satisfy the following formulae at the same time: 1(Ω·cm2)≤A≤10(Ω·cm2) and 200(Ω·cm2)≤B≤450(Ω·cm2).

公开(公告)号：US12246313B2

公开(公告)日：2025-03-11

申请号：US17242848

申请日：2021-04-28

Applicant: AGC Inc.

Inventor： Yasushi Yamaki ,  Hiromitsu Kusano

IPC: C08L27/12 ,  B01D67/00 ,  B01J39/05 ,  B01J39/20 ,  B01J47/12 ,  C08J5/22 ,  C09D127/14 ,  C09D127/16 ,  C09D127/18 ,  C09D127/20

Abstract: The present invention provides composite particles which are capable of forming an ion exchange membrane with fewer defects and an ion exchange membrane. The composite particles according to the present invention comprise pellets comprising a fluorinated polymer having groups convertible to ion exchange groups, and a powder held on the pellet surface which comprises a polymer, wherein the powder has an average particle diameter of at least 1 μm and at most 1,000 μm, and the ratio of the average particle diameter of the pellets to the average particle diameter of the powder is 2 to 4,500.

公开(公告)号：US11066751B2

公开(公告)日：2021-07-20

申请号：US16156360

申请日：2018-10-10

Applicant: AGC Inc.

Inventor： Yasushi Yamaki ,  Takayuki Kaneko ,  Hiromitsu Kusano ,  Takuo Nishio

IPC: C25B13/08 ,  B01J39/20 ,  B01J47/12 ,  C25B1/46 ,  B01J39/05 ,  B01J39/07 ,  C25B9/23

Abstract: To provide an ion exchange membrane for alkali chloride electrolysis which is a membrane having a high water permeability and being capable of maintaining a low electrolysis voltage while suppressing the amount of water supplied to a cathode chamber to be minimum, and which is capable of forming an aqueous alkali hydroxide solution having a high caustic alkali quality. The ion exchange membrane for alkali chloride electrolysis comprises a layer 12 made of a fluorinated polymer having carboxylic acid functional groups, and a layer 14A and a layer 14B made of a fluorinated polymer having sulfonic acid functional groups, wherein a reinforcing material 20 containing reinforcing threads 22 is disposed between the layer 14A and the layer 14B, the thickness when dried, of the layer 12 is from 9 to 28 μm, the layer 14B includes a layer having an ion exchange capacity of from 1.3 to 2.5 meq/g, the thickness when dried, of the layer 14B is from 6 to 100 μm, the layer 14A includes a layer having an ion exchange capacity of from 0.9 to 1.25 meq/g, and the thickness when dried, of the layer 14A is from 40 to 110 μm.

公开(公告)号：US10370511B2

公开(公告)日：2019-08-06

申请号：US15291121

申请日：2016-10-12

Applicant: AGC Inc.

Inventor： Hiromitsu Kusano ,  Takayuki Kaneko ,  Yasushi Yamaki ,  Takayuki Endo

IPC: B01J39/20 ,  C08J5/22 ,  C08F8/44 ,  C25B13/08 ,  C25B1/16 ,  B01J39/04 ,  C01D1/04 ,  C25B9/08 ,  B01J47/12 ,  C08F214/26

Abstract: To provide a cation exchange membrane which is less susceptible to swelling or elongation during electrolysis of a potassium chloride aqueous solution even without permitting water absorption or swelling immediately prior to mounting it in an electrolyzer, and a method whereby it possible to stably produce a potassium hydroxide aqueous solution without necessity to conduct an operation for water absorption or swelling immediately prior to mounting the membrane in the electrolyzer. A cation exchange membrane comprising a polymer having cation exchange groups, wherein in cations (100 mol %) contained in the cation exchange membrane, the total of potassium ions and sodium ions is at least 99 mol %, and in the total (100 mol %) of potassium ions and sodium ions contained in the cation exchange membrane, the potassium ions are 80-98 mol % and the sodium ions are 20-2 mol %.