# US 9,520,209 B2 · Flame retardant twin axial cable > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 9,520,209 B2 - Document ID: US9520209B2 - Status: Granted - Kind: B2 - Application number: 14/648,461 - Filed: 2013-02-20 - Published: 2015-10-22 - Granted: 2016-12-13 - Earliest claimed: 2012-12-17 - Assignees: 3M Innovative Properties Company - Applicants: 3M Innovative Properties Company - Inventors: Chuang-Wei Chiu; Douglas B. Gundel; Haohao Lin; Mark T. Palmer; Eumi Pyun - Web page: https://patentgrep.com/patent/US9520209B2 ## CPC - H01B 7/295: using material resistant to flame - H01B 3/10: metallic oxides (ceramics H01B3/12) - H01B 3/307: {Other macromolecular compounds} - H01B 3/441: {from alkenes} - H01B 3/442: {from aromatic vinyl compounds} - H01B 7/0807: {Twin conductor or cable} - H01B 11/203: {forming a flat arrangement} - H01B: CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES (selection for magnetic properties H01F1/00; waveguides H01P {; printed circuits H05K}) ## Abstract A cable includes a plurality of conductor sets. Each conductor set extending along a length of the cable and includes two or more insulated conductors, each insulated conductor including a central conductor surrounded by a dielectric material that includes polyolefin, a brominated flame retardant, and antimony trioxide. First and second conductive shielding films are disposed on opposite first and second sides of the conductor set, including cover portions and pinched portions arranged such that, in transverse cross section, the cover portions of the first and second shielding films in combination substantially surround the conductor set, and the pinched portions of the first and second shielding films in combination form pinched portions of the conductor set on each side of the conductor set. The cable includes an adhesive layer bonding the first shielding film to the second shielding film in the pinched portions of the conductor set. ## Claims ### Claim 1 A cable comprising: a plurality of conductor sets, each conductor set extending along a length of the cable and comprising: two or more insulated conductors, each insulated conductor comprising a central conductor surrounded by a dielectric material; first and second conductive shielding films disposed on opposite first and second sides of the conductor set, the first and second conductive shielding films including cover portions and pinched portions arranged such that, in transverse cross section, the cover portions of the first and second shielding films in combination substantially surround the conductor set, and the pinched portions of the first and second shielding films in combination form pinched portions of the conductor set on each side of the conductor set; and an adhesive layer bonding the first shielding film to the second shielding film in the pinched portions of the conductor set, wherein the dielectric material comprises: 100 parts by weight of polyolefin; 18 to 40 parts by weight of a brominated flame retardant selected from a group consisting of decabromodiphenylethane, N,N′-ethylene-bis(tetrabromophthalimide), poly(pentabromobenzyl acrylate), and mixtures thereof; and 12 to 20 parts by weight of antimony trioxide. ### Claim 2 (depends on 1) The cable of claim 1, wherein each conductor set further comprises an insulating jacket covering the first and second conductive shielding films. ### Claim 3 (depends on 1) The cable of claim 1, wherein each conductor set extends along the entire length of the cable. ### Claim 4 (depends on 1) The cable of claim 1, wherein a wire diameter of each insulated conductor of each conductor set in the plurality of conductor sets is not greater than 20 AWG. ### Claim 5 (depends on 1) The cable of claim 1, wherein each insulated conductor of each conductor set in the plurality of conductor sets has a nominal characteristic impedance in a range of 40-60 ohms. ### Claim 6 (depends on 1) The cable of claim 1, wherein each conductor set further includes one or more drain ground wires extending along the length of the cable and in capacitive contact with at least one of the first and second conductive shielding films of the conductor set. ### Claim 7 (depends on 6) The cable of claim 6, wherein at least one drain ground wire in the one or more drain wires is disposed between two insulated conductors. ### Claim 8 (depends on 1) The cable of claim 1 further comprising one or more drain ground wires disposed between the conductor sets. ### Claim 9 (depends on 1) The cable of claim 1, wherein the first and second conductive shielding films comprise at least one of copper, aluminum, and silver. ### Claim 10 (depends on 1) The cable of claim 1, wherein the cover portions of the first and second shielding films of each conductor set in combination substantially surround the conductor set by encompassing at least 70% of a periphery of each conductor set. ### Claim 11 (depends on 1) The cable of claim 1, wherein a weight ratio of the brominated flame retardant and the antimony trioxide is in a range from about 1.5 to about 3.5. ### Claim 12 (depends on 1) The cable of claim 1, wherein the brominated flame retardant is decabromodiphenylethane. ### Claim 13 (depends on 1) The cable of claim 1, wherein said polyolefin is selected from a group consisting of propylene/ethylene copolymer, 1-hexene/ethylene copolymer, and blends thereof.