# US 2022/0045338 A1 · Compositions for bipolar plates and methods for preparing same > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2022/0045338 A1 - Document ID: US20220045338A1 - Status: Published application - Kind: A1 - Application number: 17/278,642 - Filed: 2019-09-20 - Published: 2022-02-10 - Earliest claimed: 2018-09-21 - Assignees: Arkema France; Eisenhuth GmbH & Co. KG - Applicants: Arkema France; Eisenhuth GmbH & Co. KG - Inventors: Stéphane BIZET; Jérôme CHAUVEAU; Thorsten HICKMANN - Web page: https://patentgrep.com/patent/US20220045338A1 ## CPC - H01M 8/0221: Organic resins; Organic polymers - B29C 43/003: {characterised by the choice of material} - H01M 8/0213: Gas-impermeable carbon-containing materials - H01M 8/0226: in the form of mixtures - B29K 2027/16: {PVDF, i.e. polyvinylidene fluoride} - B29K 2507/04: Carbon - B29K 2995/0005: Conductive - Y02E 60/50: Fuel cells - H01M: PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY - B29C: SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING (making preforms B29B11/00; making laminated products by combining previously unconnected layers which become one product whose layers will remain together B32B37/00 - B32B41/00) - B29K: INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR {MOULDS, } REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS - Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION ## Abstract The invention relates to a method for producing a composition comprising the steps of: melt-blending a fluorinated polymer, preferably a polyvinylidene fluoride polymer, with a first conductive filler so as to obtain a conductive fluorinated polymer; grinding to powder said conductive fluorinated polymer; mixing the powder of conductive fluorinated polymer with a second conductive filler. The invention also relates to a composition comprising a second conductive filler and particles of conductive fluorinated polymer, wherein the particles of conductive fluorinated polymer comprise a fluorinated polymer matrix in which a first conductive filler is dispersed The invention also relates to a method for producing a bipolar plate and to a bipolar plate. ## Claims ### Claim 1 A method for producing a composition comprising the steps of: melt-blending a fluorinated polymer with a first conductive filler so as to obtain a conductive fluorinated polymer; grinding to powder said conductive fluorinated polymer; mixing the powder of conductive fluorinated polymer with a second conductive filler. ### Claim 2 (depends on 1) The method according to claim 1, wherein the second conductive filler is graphite. ### Claim 3 (depends on 1) The method according to claim 1, wherein the first conductive filler is selected from the group consisting of electronically conductive polymers, carbon black, carbon nanotubes, graphene, graphite, carbon fibers and a mixture thereof. ### Claim 4 (depends on 1) The method according to claim 1, wherein the step of mixing the powder of conductive fluorinated polymer with a second conductive filler is a step of compounding the powder of conductive fluorinated polymer with the second conductive filler in an extruder. ### Claim 5 (depends on 1) The method according to claim 1, wherein the first conductive filler is present in an amount of from 0.1% to 35% by weight, based on the weight of the conductive fluorinated polymer. ### Claim 6 (depends on 1) The method according to claim 1, wherein the conductive fluorinated polymer is present in an amount of from 10% to 40%, and the second conductive filler is present in an amount of from 60% to 90%, based on the total weight of the composition. ### Claim 7 (depends on 1) The method according to claim 1, wherein the conductive fluorinated polymer is ground to a powder having a volume median diameter Dv50 ranging from 10 μm to 1 mm. ### Claim 8 (depends on 1) The method according to claim 1, wherein the fluorinated polymer has a viscosity measured by capillary rheometry at a shear rate of 100 s−1 and at 230° C. lower than 3000 Pa·s. ### Claim 9 (depends on 1) A composition obtainable by the method according to claim 1. ### Claim 10 A composition comprising a second conductive filler and particles of conductive fluorinated polymer, wherein the particles of conductive fluorinated polymer comprise a fluorinated polymer matrix in which a first conductive filler is dispersed. ### Claim 11 (depends on 10) The composition according to claim 10, wherein the fluorinated polymer matrix is a polyvinylidene fluoride matrix and/or the second conductive filler is graphite and/or the first conductive filler is selected from the group consisting of electronically conductive polymers, carbon black, carbon nanotubes, graphene, graphite, carbon fibers and a mixture thereof. ### Claim 12 (depends on 10) The composition according to claim 10, wherein the second conductive filler is present in an amount of from 60% to 90%, based on the total weight of the composition and/or the first conductive filler is present in an amount of 0.01% to 14%, based on the total weight of the composition. ### Claim 13 (depends on 10) The composition according to claim 10, wherein the fluorinated polymer has a viscosity measured by capillary rheometry at a shear rate of 100 s 1 and at 230° C. lower than 3000 Pa·s. ### Claim 14 (depends on 1) A method for producing a bipolar plate, comprising the steps of: producing a composition according to the method of claim 1; compression-molding the composition. ### Claim 15 (depends on 10) A bipolar plate comprising the composition according to claim 10. ### Claim 16 (depends on 1) The method according to claim 1, wherein the fluorinated polymer is a polyvinylidene fluoride polymer. ### Claim 17 (depends on 9) A method for producing a bipolar plate, comprising the steps of: providing the composition of claim 9; compression-molding the composition. ### Claim 18 (depends on 10) A method for producing a bipolar plate, comprising the steps of: providing the composition of claim 10; compression-molding the composition. ### Claim 19 (depends on 14) A bipolar plate obtainable by the method of claim 14. ### Claim 20 (depends on 9) A bipolar plate comprising the composition according to claim 9.