# US 2008/0185751 A1 · Polybenzimidazole-polyetherketoneketone blends and miscible blends > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2008/0185751 A1 - Document ID: US20080185751A1 - Status: Published application - Kind: A1 - Application number: 11/671,169 - Filed: 2007-02-05 - Published: 2008-08-07 - Earliest claimed: 2007-02-05 - Assignees: PBI Performance Products, Inc. - Inventors: Bobby G. Dawkins; Michael Gruender; Gregory S. Copeland; Tim Hsu - Web page: https://patentgrep.com/patent/US20080185751A1 ## CPC - C08L 79/04: Polycondensates having nitrogen-containing heterocyclic rings in the main chain; Polyhydrazides; Polyamide acids or similar polyimide precursors - B29C 48/40: using two or more parallel screws {or at least two parallel non-intermeshing screws}, e.g. twin screw extruders - B29C 48/625: characterised by the ratio of the threaded length of the screw to its outside diameter [L/D ratio] - B29C 48/793: upstream of the plasticising zone, e.g. heating in the hopper - B29C 48/802: {Heating} - B29C 48/832: {Heating} - B29C 48/865: {Heating} - B29C 48/875: for achieving a non-uniform temperature distribution, e.g. using barrels having both cooling and heating zones - B29C 48/92: Measuring, controlling or regulating - C08G 65/4012: {Other compound (II) containing a ketone group, e.g. X-Ar-C(=O)-Ar-X for polyetherketones} - C08G 73/22: Polybenzoxazoles - C08J 3/005: {Processes for mixing polymers} - C08L 65/00: Compositions of macromolecular compounds obtained by reactions forming a carbon-to-carbon link in the main chain (C08L7/00 - C08L57/00, C08L61/00 take precedence); Compositions of derivatives of such polymers - C08L 71/00: Compositions of polyethers obtained by reactions forming an ether link in the main chain (of polyacetals C08L59/00; of epoxy resins C08L63/00; of polythioether-ethers C08L81/02; of polyether-sulfones C08L81/06); Compositions of derivatives of such polymers - B29C 48/022: {characterised by the choice of material} - B29C 48/09: Articles with cross-sections having partially or fully enclosed cavities, e.g. pipes or channels - B29C 48/83: {Heating or cooling the cylinders} - C08G 2261/3442: Polyetherketones - C08G 2650/40: containing ketone groups, e.g. polyarylethylketones, PEEK or PEK - C08J 2365/00: Characterised by the use of macromolecular compounds obtained by reactions forming a carbon-to-carbon link in the main chain (C08J2307/00 - C08J2357/00, C08J2361/00 take precedence); Derivatives of such polymers - C08J 2371/00: Characterised by the use of polyethers obtained by reactions forming an ether link in the main chain; Derivatives of such polymers - C08J 2379/04: Polycondensates having nitrogen-containing heterocyclic rings in the main chain; Polyhydrazides; Polyamide acids or similar polyimide precursors - C08L: COMPOSITIONS OF MACROMOLECULAR COMPOUNDS (compositions based on polymerisable monomers C08F, C08G; artificial filaments or fibres D01F; textile treating compositions D06) - 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) - C08G: MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS - C08J: WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H (working, e.g. shaping, of plastics B29) ## Abstract A process for producing a solution blend of a polybenzimidazole (PBI) and a polyetherketoneketone (PEKK). The PBI is mixed with sulfuric acid at a temperature between 40° C. and 80° C. for 30 minutes to 2 hours to produce a PBI solution then cooled to room temperature to form a cooled PBI solution. Then PEKK is added to the cooled PBI solution to form a mixture and that mixture is stirred from 30 minutes to 2 hours at room temperature to form a stirred mixture. The stirred mixture is poured into an excess of water being stirred swiftly to form an aqueous mixture. The aqueous mixture is filtered to produce a blend. The blend is washed with water and dried. The resulting blend can yield a blend in all proportion from 1/99 PBI/PEKK to 99/1 PBI/PEKK. ## Claims ### Claim 1 A process for producing a solution blend of a polybenzimidazole (PBI) and a polyetherketoneketone (PEKK) which comprises the steps of: providing a polybenzimidazole (PBI) and a polyetherketoneketone (PEKK); mixing said PBI with sulfuric acid at a temperature between 40° C. and 80° C. for 30 minutes to 2 hours to produce a PBI solution; cooling said PBI solution to room temperature to form a cooled PBI solution; adding said PEKK to said cooled PBI solution to form a mixture; stirring said mixture from 30 minutes to 2 hours at room temperature to form a stirred mixture; pouring said stirred mixture into an excess of water being stirred swiftly to form an aqueous mixture; filtering said aqueous mixture to remove the water and sulfuric acid to produce a blend; washing said blend with water; and drying said blend to yield a blend in all proportion from 1/99 PBI/PEKK to 99/1 PBI/PEKK. ### Claim 2 (depends on 1) The process for producing a blend of a polybenzimidazole (PBI) and a polyetherketoneketone (PEKK) according to claim 1 where sulfuric acid has a concentration of between 85% and 110%. ### Claim 3 (depends on 1) The process for producing a blend of a polybenzimidazole (PBI) and a polyetherketoneketone (PEKK) according to claim 1 further comprising the steps of: neutralizing said blend in a base to produce a neutralized blend; washing said neutralized blend in water to produce a washed blend; and drying said washed blend to yield a blend in all proportion from 1/99 PBI/PEKK to 99/1 PBI/PEKK. ### Claim 4 A process for producing a solution blend of a polybenzimidazole (PBI) and a polyetherketoneketone (PEKK) which comprises the steps of: providing a polybenzimidazole (PBI) and a polyetherketoneketone (PEKK); providing a strong acid which is selected from a group consisting of: sulfuric acid, methane sulfonic acid, trifluoromethane sulfonic acid, trifluoroacetic acid, dichloroacetic acid, formic acid and combinations thereof; mixing said PBI and PEKK with said strong acid at a temperature between 40° C. and 80° C. for 30 minutes to 2 hours to produce a mixture; cooling said mixture to room temperature; dropping said mixture into a bath where said bath is selected from the group of water or a water methanol blend; stirring swiftly said mixture and said bath to form an aqueous mixture; filtering said aqueous mixture to remove the water and strong acid to produce a blend; washing said blend with water; and drying said blend to yield a blend in all proportion from 1/99 PBI/PEKK to 99/1 PBI/PEKK. ### Claim 5 (depends on 1) The process for producing a blend of a polybenzimidazole (PBI) and a polyetherketoneketone (PEKK) according to claim 1 where said process is performed at atmospheric pressure. ### Claim 6 (depends on 5) The process for producing a blend of a polybenzimidazole (PBI) and a polyetherketoneketone (PEKK) according to claim 5 where said process is absent of added pressure. ### Claim 7 (depends on 1) The process for producing a blend of a polybenzimidazole (PBI) and a polyetherketoneketone (PEKK) according to claim 1 where the step of being swiftly stirred is done in a Waring blender. ### Claim 8 (depends on 3) The process for producing a blend of a polybenzimidazole (PBI) and a polyetherketoneketone (PEKK) according to claim 3 where said base is ammonium hydroxide. ### Claim 9 (depends on 3) The process for producing a blend of a polybenzimidazole (PBI) and a polyetherketoneketone (PEKK) according to claim 3 where said drying step is performed at a temperature from 90° C. to 180° C. ### Claim 10 (depends on 9) The process for producing a blend of a polybenzimidazole (PBI) and a polyetherketoneketone (PEKK) according to claim 9 where said drying step is performed from 4 to 12 hours. ### Claim 11 (depends on 10) The process for producing a blend of a polybenzimidazole (PBI) and a polyetherketoneketone (PEKK) according to claim 10 where said drying step is performed in a vacuum. ### Claim 12 (depends on 1) The process for producing a blend of a polybenzimidazole (PBI) and a polyetherketoneketone (PEKK) according to claim 1 where said blend is a miscible blend of a polybenzimidazole (PBI) and a polyetherketoneketone (PEKK) where said blend is miscible in all proportions from 50/50 to 90/10 (PBI/PEKK). ### Claim 13 (depends on 12) The process for producing said miscible blend of a polybenzimidazole (PBI) and a polyetherketoneketone (PEKK) according to claim 12 where said blend has a glass transition temperature, Tg, of greater than 400° C. ### Claim 14 (depends on 1) A miscible blend of a polybenzimidazole (PBI) and a polyetherketoneketone (PEKK) made by the process of claim 1 where said blend is miscible in all proportions from 50/50 to 90/10 (PBI/PEKK) having a glass transition temperature, Tg, of greater than 400° C. ### Claim 15 (depends on 1) A miscible blend of a polybenzimidazole (PBI) and a polyetherketoneketone (PEKK) made by the process of claim 1 where said blend has from 50/50 to 90/10 (PBI/PEKK) where said blend has a weight loss of less than 20% at 600° C. ### Claim 16 (depends on 1) A miscible blend of a polybenzimidazole (PBI) and a polyetherketoneketone (PEKK) made by the process of claim 1 where said blend has from 50/50 to 90/10 (PBI/PEKK) where said blend has a weight loss of 30% or less at 800° C. ### Claim 17 A process for producing a melt blend of a polybenzimidazole (PBI) and a polyetherketoneketone (PEKK) which comprises the steps of: providing a polybenzimidazole (PBI) and a polyetherketoneketone (PEKK); providing an extruder with a plurality of heating zones; pre-dry-mixing said PBI with said PEKK to obtain a dry mix; feeding said dry mix to said extruder; setting said heating zones in the range 240° C. to 410° C.; melting said dry mix blend as it passes through said extruder; and obtaining said melt blend of PBI/PEKK in all proportion from 1/99 PBI/PEKK to 80/20 PBI/PEKK. ### Claim 18 (depends on 18) The process for producing a melt blend of a polybenzimidazole (PBI) and a polyetherketoneketone (PEKK) according to claim 18 where said extruder is a screw extruder where said screw is run in a range of 30 to 160 rpm. ### Claim 19 (depends on 18) A miscible blend of a polybenzimidazole (PBI) and a polyetherketoneketone (PEKK) made by the process of claim 18 where said blend has from 60/40 to 80/20 (PBI/PEKK) where said blend has a weight loss of less than 20% at 600° C. ### Claim 20 (depends on 18) A miscible blend of a polybenzimidazole (PBI) and a polyetherketoneketone (PEKK) made by the process of claim 18 where said blend has from 60/40 to 80/20 (PBI/PEKK) where said blend has a glass transition temperature, Tg, of greater than 400° C.