# US 8,465,839 B2 · Polyimide polybenzimidazole intermediate transfer members > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 8,465,839 B2 - Document ID: US8465839B2 - Status: Granted - Kind: B2 - Application number: 13/214,498 - Filed: 2011-08-22 - Published: 2013-02-28 - Granted: 2013-06-18 - Earliest claimed: 2011-08-22 - Assignees: Xerox Corporation - Applicants: Jin Wu - Inventors: Jin Wu - Web page: https://patentgrep.com/patent/US8465839B2 ## CPC - C08G 73/105: {with oxygen only in the diamino moiety} - C08G 73/1067: {Wholly aromatic polyimides, i.e. having both tetracarboxylic and diamino moieties aromatically bound} - C08G 73/1071: {Wholly aromatic polyimides containing oxygen in the form of ether bonds in the main chain} - C08G 73/18: Polybenzimidazoles - C08K 3/04: Carbon - C08L 79/04: Polycondensates having nitrogen-containing heterocyclic rings in the main chain; Polyhydrazides; Polyamide acids or similar polyimide precursors - C08L 79/08: Polyimides; Polyester-imides; Polyamide-imides; Polyamide acids or similar polyimide precursors - G03G 15/162: {details of the the intermediate support, e.g. chemical composition} - Y10T 428/3154: Of fluorinated addition polymer from unsaturated monomers - Y10T 428/31544: Addition polymer is perhalogenated - Y10T 428/31663: As siloxane, silicone or silane - Y10T 428/31721: Of polyimide - C08G: MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS - 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) - G03G: ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY - Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION ## Abstract An intermediate transfer member that includes a mixture of a thermoplastic polyimide, a polybenzimidazole, and an optional conductive filler. ## Claims ### Claim 1 An intermediate transfer member consisting of said member that has transferred thereto a developed xerographic image from a photoconductor and wherein said member consists of a mixture of a carbon black filler, a thermoplastic polyimide and a polybenzimidazole and wherein said thermoplastic polyimide is represented by the following formulas/structures wherein R is phenyl and wherein n is from about 100 to about 1,000 and an optional release layer. ### Claim 2 (depends on 1) An intermediate transfer member in accordance with claim 1 wherein said n is a number to arrive at a weight average molecular weight of about 45,000. ### Claim 3 (depends on 1) An intermediate transfer member in accordance with claim 1 wherein said polybenzimidazole is represented by the following formulas/structure wherein n is a number of from about 30 to about 500 ### Claim 4 (depends on 3) An intermediate transfer member in accordance with claim 3 wherein n is a number to arrive at a weight average molecular weight of about 60,000 and wherein said polybenzimidazole is present in an amount of about 5 weight percent. ### Claim 5 (depends on 1) An intermediate transfer member in accordance with claim 1 wherein said polyimide is present in an amount of from about 1 to about 95 weight percent, said polybenzimidazole is present in an amount of from about 1 to about 95 weight percent, said carbon black is present in an amount of from about 4 to about 30 weight percent of the total solids. ### Claim 6 (depends on 1) An intermediate transfer member in accordance with claim 1 wherein said thermoplastic polyimide is present in an amount of from about 2 to about 80 weight percent, said polybenzimidazole is present in an amount of from about 2 to about 80 weight percent, and said carbon black is present in an amount of from about 8 to about 20 weight percent of the total solids. ### Claim 7 (depends on 1) An intermediate transfer member in accordance with claim 1 wherein said thermoplastic polyimide is present in an amount of from about 10 to about 70 weight percent, said polybenzimidazole is present in an amount of from about 10 to about 70 weight percent, and said carbon black is present in an amount of from about 10 to about 18 weight percent of total solids. ### Claim 8 (depends on 1) An intermediate transfer member in accordance with claim 1 wherein said member has a Young's Modulus of from about 3,000 to about 8,500 Mega Pascals, and a coefficient of thermal expansion of from about 15 to about 55 ppm/K. ### Claim 9 (depends on 1) An intermediate transfer member in accordance with claim 1 wherein said thermoplastic polyimide has a number average molecular weight of from about 5,000 to about 50,000, and a weight average molecular weight of from about 10,000 to about 200,000, said polybenzimidazole has a number average molecular weight of from about 3,000 to about 40,000, and a weight average molecular weight of from about 9,000 to about 150,000, and said member has a resistivity of from about 108 to about 1013 ohm/square. ### Claim 10 (depends on 1) An intermediate transfer member in accordance with claim 1 wherein said thermoplastic polymide has a number average molecular weight of from about 10,000 to about 25,000, and a weight average molecular weight of from about 50,000 to about 150,000, and said polybenzimidazole has a number average molecular weight of from about 9,000 to about 15,000, and a weight average molecular weight of from about 20,000 to about 120,000. ### Claim 11 (depends on 1) An intermediate transfer member in accordance with claim 1 wherein said outer release layer is present and is positioned on said mixture of said thermoplastic polyimide and said polybenzimidazole, wherein said release layer is selected from the group consisting of a fluorinated ethylene propylene copolymer, a polytetrafluoroethylene, a polyfluoroalkoxypolytetrafluoroethylene, a fluorosilicone, a terpolymer of vinylidene fluoride, hexafluoropropylene, and tetrafluoroethylene, and mixtures thereof. ### Claim 12 (depends on 1) An intermediate transfer member in accordance with claim 1 wherein said polybenzimidazole is represented by the following formulas/structures wherein n represents the number of repeating segments of from about 10 to about 800. ### Claim 13 (depends on 12) An intermediate transfer member in accordance with claim 12 wherein n is a number of from about 200 about 700. ### Claim 14 (depends on 12) An intermediate transfer member in accordance with claim 12 wherein n is a number of from about 30 to about 500. ### Claim 15 (depends on 12) An intermediate transfer member in accordance with claim 12 wherein n is a number of from about 100 to about 300. ### Claim 16 An intermediate transfer member consisting of a photoconductor containing a developed xerographic image thereon and which image is transferred to said member consisting of a mixture of a conductive filler of carbon black, a thermoplastic polyimide and a polybenzimidazole, wherein said thermoplastic polyimide is selected from the group consisting of those represented by the following formulas/structures wherein R is phenyl and n is from about 100 to about 1,000 and wherein said polybenzimidazole is represented by the following formulas/structures wherein n represents the number of repeating segments of from about 30 to about 500 and wherein said member has a Young's Modulus of from about 3,000 to about 8,500 Mega Pascals, and a coefficient of thermal expansion of from about 15 to about 55 ppm/K. ### Claim 17 (depends on 16) An intermediate transfer member in accordance with claim 16 wherein n of the polybenzimidazole is from about 100 to about 400, and where said polybenzimidazole has a glass transition temperature of from about 380° C. to about 420° C. ### Claim 18 An abrasion resistant xerographic intermediate transfer member consisting of a mixture of a thermoplastic polyimide, a polybenzimidazole, and an optional carbon black conductive filler, and wherein said member possesses a Young's Modulus of from about 3,500 to about 6,500 Mega Pascals and a coefficient of thermal expansion of from about 25 ppm/K to about 55 ppm/K and wherein said thermoplastic polyimide is represented by wherein R is phenyl and n is the number of the repeating units wherein n is a number of from about 100 to about 300 and wherein said polybenzimidazole is represented by the following formulas/structures wherein n represents the number of repeating segments of from about 30 to about 500.