# US 11,993,694 B2 · Conductive polyester composition > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,993,694 B2 - Document ID: US11993694B2 - Status: Granted - Kind: B2 - Application number: 17/844,144 - Filed: 2022-06-20 - Published: 2023-03-23 - Granted: 2024-05-28 - Earliest claimed: 2021-09-13 - Assignees: Nan Ya Plastics Corporation - Applicants: Nan Ya Plastics Corporation - Inventors: Te-Chao Liao; Chun-Che Tsao; Yueh-Shin Liu - Web page: https://patentgrep.com/patent/US11993694B2 ## CPC - C08K 3/041: {Carbon nanotubes} - C08L 67/00: Compositions of polyesters obtained by reactions forming a carboxylic ester link in the main chain (of polyester-amides C08L77/12; of polyester-imides C08L79/08); Compositions of derivatives of such polymers - H01B 1/124: {Intrinsically conductive polymers} - H01B 1/24: the conductive material comprising carbon-silicon compounds, carbon or silicon - C08K 2201/001: Conductive additives - C08K 2201/003: Additives being defined by their diameter - C08K 2201/004: Additives being defined by their length - C08K 2201/011: Nanostructured additives - C08L 2201/08: Stabilised against heat, light or radiation or oxydation - C08L 2310/00: Masterbatches - C08K: Use of inorganic or non-macromolecular organic substances as compounding ingredients (paints, inks, varnishes, dyes, polishes, adhesives C09) - C08L: COMPOSITIONS OF MACROMOLECULAR COMPOUNDS (compositions based on polymerisable monomers C08F, C08G; artificial filaments or fibres D01F; textile treating compositions D06) - 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 conductive polyester composition is provided, which includes a polyester base material and a conductive reinforcing material. The conductive reinforcing material includes a plurality of carbon nanotubes, and the plurality of carbon nanotubes are dispersed in the polyester base material. In each of the carbon nanotubes, a length of the carbon nanotube is defined as L, a diameter of the carbon nanotube is defined as D and is between 1 nanometer and 30 nanometers, and an L/D value of the carbon nanotube is between 300 and 2,000. The plurality of carbon nanotubes are in contact with each other to form a plurality of contact points, so that the conductive polyester composition has a surface impedance of not greater than 107 Ω/sq. ## Claims ### Claim 1 A conductive polyester composition, comprising: a polyester base material; and a conductive reinforcing material, wherein the conductive reinforcing material includes a plurality of carbon nanotubes, and the plurality of carbon nanotubes are dispersed in the polyester base material; wherein in each of the carbon nanotubes, a length of the carbon nanotube is defined as L, a diameter of the carbon nanotube is defined as D and is between 1 nanometer and 30 nanometers, and an L/D value of the carb on nanotube is between 1,000 and 2,000; wherein the plurality of carbon nanotubes are in contact with each other to form a plurality of contact points, so that the conductive polyester composition has a surface impedance of not greater than 107 Ω/sq; a compatibilizer configured to assist in dispersing the plurality of carbon nanotubes in the polyester base material, wherein, based on a total weight of the conductive polyester composition, a content of the compatibilizer is between 1.5 wt% and 10 wt%, wherein the plurality of carbon nanotubes of the conductive reinforcing material are at least one material selected from a group consisting of hydroxylated carbon nanotubes and carboxylic carbon nanotubes; wherein the compatibilizer is a polyolefin compatibilizer formed by grafting, modification or copolymerization of glycidyl methacrylate (GMA), or a siloxane compound. ### Claim 2 (depends on 1) The conductive polyester composition according to claim 1, wherein in each of the carbon nanotubes, the length is between 10 micrometers and 20 micrometers, and the diameter is between 5 nanometers and 20 nanometers. ### Claim 3 (depends on 1) The conductive polyester composition according to claim 1, wherein, based on a total weight of the conductive polyester composition, a content of the polyester base material is between 70 wt % and 95 wt %, and a content of the conductive reinforcing material is between 1.5 wt % and 10 wt %. ### Claim 4 (depends on 1) The conductive polyester composition according to claim 1, wherein the plurality of carbon nanotubes of the conductive reinforcing material are multi-walled carbon nanotubes (MWCNT) having a multi-layer carbon atom structure. ### Claim 5 (depends on 1) The conductive polyester composition according to claim 1, wherein the glycidyl methacrylate in a molecular structure of the compatibilizer is capable of carrying out a ring cleavage reaction in a mixing process, and an epoxy group in the glycidyl methacrylate is capable of carrying out a chemical reaction with a reactive functional group on a surface of the carbon nanotube and/or an ester group in a molecular structure of the polyester base material after the ring cleavage reaction, so that the carbon nanotubes are dispersed in the polyester base material; wherein the reactive functional group on the surface of the carbon nanotube is at least one of a —OH functional group and a —COOH functional group. ### Claim 6 (depends on 1) The conductive polyester composition according to claim 1, wherein the plurality of carbon nanotubes of the conductive reinforcing material are at least one material selected from a group consisting of hydroxylated multi-walled carbon nanotubes and carboxylic multi-walled carbon nanotubes. ### Claim 7 (depends on 1) The conductive polyester composition according to claim 1, wherein the compatibilizer is at least one material selected from a group consisting of an ethylene-methyl acrylate-glycidyl methacrylate copolymer (E-MA-GMA), polyolefin elastomer-grafted glycidyl methacrylate (POE-g-GMA), polyethylene-grafted glycidyl methacrylate (PE-g-GMA), and a siloxane compound. ### Claim 8 (depends on 1) The conductive polyester composition according to claim 1, further comprising: an antioxidant, wherein, based on a total weight of the conductive polyester composition, a content of the antioxidant is between 0.1 wt % and 1 wt %. ### Claim 9 (depends on 1) The conductive polyester composition according to claim 1, wherein the conductive polyester composition is capable of mixing modification of a twin-screw process, and the conductive polyester composition has a surface impedance of not greater than 107 Ω/sq after the mixing modification of the twin-screw process. ### Claim 10 (depends on 9) The conductive polyester composition according to claim 9, wherein, after the conductive polyester composition is subjected to the mixing modification of the twin-screw process, a conductive polyester sheet material is formed; wherein the conductive polyester sheet material has a surface impedance of 103 Ω/sq to 104 Ω/sq before an extension, and has a surface impedance of 104 Ω/sq to 107 Ω/sq after a 200% to 400% extension along an extension direction.