# US 11,028,954 B2 · Accumulator having a diaphragm or bladder with a metallized barrier film > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,028,954 B2 - Document ID: US11028954B2 - Status: Granted - Kind: B2 - Application number: 16/447,070 - Filed: 2019-06-20 - Published: 2020-12-24 - Granted: 2021-06-08 - Earliest claimed: 2019-06-20 - Assignees: Freudenberg-NOK General Partnership - Applicants: Freudenberg-NOK General Partnership - Inventors: Joe Walker; Paul J. Hochgesang; Nate Tuckerman - Web page: https://patentgrep.com/patent/US11028954B2 ## CPC - B32B 1/00: Layered products having a non-planar shape - F16L 55/053: the gas in the reservoir being separated from the fluid in the pipe - B32B 3/18: characterised by an internal layer formed of separate pieces of material {which are juxtaposed side-by-side (B32B5/02 takes precedence)} - B32B 7/12: using interposed adhesives or interposed materials with bonding properties - B32B 25/08: of synthetic resin - B32B 25/14: comprising {synthetic rubber copolymers (B32B25/18 and B32B25/20 take precedence)} - B32B 25/20: comprising silicone rubber - B32B 27/16: specially treated, e.g. irradiated - B32B 27/306: {comprising vinyl acetate or vinyl alcohol (co)polymers} - B32B 27/322: {comprising halogenated polyolefins, e.g. PTFE} - B32B 27/34: comprising polyamides - B32B 27/36: comprising polyesters - B32B 27/38: comprising epoxy resins - B32B 38/0008: {Electrical discharge treatment, e.g. corona, plasma treatment; wave energy or particle radiation (heat treatment B32B38/0036)} - C23C 14/20: on organic substrates - B32B 2250/03: 3 layers - B32B 2250/40: Symmetrical or sandwich layers, e.g. ABA, ABCBA, ABCCBA - B32B 2255/10: on synthetic resin layer or on natural or synthetic rubber layer - B32B 2255/205: Metallic coating - B32B 2270/00: Resin or rubber layer containing a blend of at least two different polymers - B32B 2274/00: Thermoplastic elastomer material - B32B 2307/7242: Non-permeable - B32B 2307/732: Dimensional properties - B32B: LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM - F16L: PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL - C23C: COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL (making metal-coated products by extrusion B21C23/22; covering with metal by connecting pre-existing layers to articles, see the relevant places, e.g. B21D39/00, B23K; metallising of glass C03C; metallising mortars, concrete, artificial stone, ceramics or natural stone C04B41/00; enamelling of, or applying a vitreous layer to, metals C23D; treating metal surfaces or coating of metals by electrolysis or electrophoresis C25D; single-crystal film growth C30B; by metallising textiles D06M11/83; decorating textiles by locally metallising D06Q1/04) ## Abstract A diaphragm and a bladder for an accumulator each include a thermoplastic film formed in a dome or bulbous shape. A metallic vapor deposition layer is disposed on at least one side of the thermoplastic. Inner and outer rubber layers are adhered on opposite sides of the metallic coated film so that the metallized thermoplastic film provides a barrier film to effectively slow the permeation of a gas such as nitrogen through the diaphragm or bladder. ## Claims ### Claim 1 A diaphragm for an accumulator, comprising: a thermoplastic film formed in a defined shape, wherein the thermoplastic film has a thickness of between 4 and 8 mils; a metallic layer disposed on both sides of the thermoplastic film to form a metallic coated film; and inner and outer rubber layers adhered on opposite sides of the metallic coated film. ### Claim 2 (depends on 1) The diaphragm according to claim 1, wherein the thermoplastic film is made from one of polychlorotrifluoroethylene, FEP, CTFE, ECTFE, PVF, EvOH containing laminates with polyamides, and fluorocarbon film laminates with polyesters. ### Claim 3 (depends on 1) The diaphragm according to claim 1, wherein the inner and outer rubber layers are adhered to the metallic coated film by an adhesive. ### Claim 4 (depends on 1) The diaphragm according to claim 1, wherein the metallic layer disposed on the dome-shaped thermoplastic film has a thickness of between 1500 and 5000 angstroms. ### Claim 5 (depends on 1) The diaphragm according to claim 1, wherein the metallic layer is made from aluminum. ### Claim 6 (depends on 1) The diaphragm according to claim 1, wherein each of the inner and outer rubber layers are made from one of a polyurethane, HNBR, silicone rubber, fluorocarbon rubber, and ECO rubber. ### Claim 7 A bladder for an accumulator, comprising: a thermoplastic film formed in a bulbous-shape, wherein the thermoplastic film has a thickness of between 4 and 8 mils; a metallic layer disposed on both sides of the bulbous-shaped thermoplastic film to form a metallic coated bulbous-shaped film; and inner and outer rubber layers adhered on opposite sides of the metallic coated bulbous-shaped thermoplastic film. ### Claim 8 (depends on 7) The bladder according to claim 7, wherein the thermoplastic film is made from one of polychlorotrifluoroethylene, FEP, CTFE, ECTFE, PVF, EvOH containing laminates with polyamides, and fluorocarbon film laminates with polyesters. ### Claim 9 (depends on 7) The bladder according to claim 7, wherein the inner and outer rubber layers are adhered to the metallic coated bulbous-shaped film by an adhesive. ### Claim 10 (depends on 7) The bladder according to claim 7, wherein the metallic layer disposed on the dome-shaped thermoplastic film has a thickness of between 1500 and 5000 angstroms. ### Claim 11 (depends on 7) The bladder according to claim 7, wherein the metallic layer is made from aluminum. ### Claim 12 (depends on 7) The bladder according to claim 7, wherein the inner and outer rubber layers are made from one of a polyurethane, HNBR, silicone rubber, flourocarbon rubber and ECO rubber.