Abstract: Polyimide resin compositions that contain an end-capped rigid aromatic polyimide, graphite and carbon filaments are found to exhibit low wear at high temperatures. Such compositions are especially useful in molded articles that are exposed to wear conditions at high temperatures such as aircraft engine parts.

Abstract: Described are boron carbide nanorods that have a molar ratio of 8:1 boron to carbon.

Abstract: A process is disclosed for the manufacture of 1,1,1,3,3,3-hexafluoropropane and 1,1,1,2,3,3-hexafluoropropane, hexafluoropropene and/or 1,1,1,2,3,3,3-heptafluoropropane. The process involves (a) reacting HF, Cl2, and at least one halopropene of the formula CX3CCl?CClX (where each X is independently F or Cl) to produce a product comprising CF3CCl2CF3 and CF3CClFCClF2; (b) reacting CF3CCl2CF3 and CF3CClFCClF2 produced in (a) with hydrogen, optionally in the presence of HF, to produce a product comprising CF3CH2CF3 and at least one of CHF2CHFCF3, CF3CF?CF2 and CF3CFHCF3; and (c) recovering from the product produced in (b), CF3CH2CF3 and at least one of CHF2CHFCF3, CF3CF?CF2 and CF3CFHCF3. In (a), the CF3CCl2CF3 and CF3CClFCClF2 are produced in the presence of a chlorofluorination catalyst including (i) a crystalline alpha-chromium oxide where at least 0.

Abstract: A process for the manufacture of CF3CH?CF2 and CF3CF?CHF is disclosed. The process involves (a) reacting HF and chlorine and at least one halopropene of the formula CX3CCI?CCIX (where each X is independently F or Cl) to produce a product including both CF3CCI2CF3 and CF3CCIFCCIF2; (b) reacting CF3CCI2CF3 and CF3CCIFCCIF2 produced in (a) with hydrogen to produce a product including both CF3CH2CF3 and CF3CHFCHF2; (c) dehydrofluorinating CF3CH2CF3 and CF3CHFCHF2 produced in (b) to produce a product including both CF3CH?CF2 and CF3CF?CHF; and (d) recovering CF3CH?CF2 and CF3CF?CHF from the product produced in (c). In (a), both CF3CCI2CF3 and CF3CCIFCCIF2 are produced in the presence of a chlorofluorination catalyst consisting of (i) compositions comprising a crystalline alpha-chromium oxide where at least 0.05 atom % of the chromium atoms in the alpha-chromium oxide lattice are replaced by copper, and (H) compositions of (i) which have been treated with a fluorinating agent.

Abstract: A process is disclosed for the manufacture of 1,1,1,3,3,3-hexafluoropropane and 1,1,1,2,3,3-hexafluoropropane, hexafluoropropene and/or 1,1,1,2,3,3,3-heptafluoropropane. The process involves (a) reacting HF, Cl2, and at least one halopropene of the formula CX3CCI?CCIX (where each X is independently F or CI) to produce a product comprising CF3CCI2CF3 and CF3CCIFCCIF2; (b) reacting CF3CCI2CF3 and CF3CCIFCCIF2 produced in (a) with hydrogen, optionally in the presence of HF, to produce a product comprising CF3CH2CF3 and at least one of CHF2CHFCF3, CF3CF?CF2 and CF3CFHCF3; and (c) recovering from the product produced in (b), CF3CH2CF3 and at least one of CHF2CHFCF3, CF3CF?CF2 and CF3CFHCF3. In (a), the CF3CCI2CF3 and CF3CCIFCCIF2 are produced in the presence of a chlorofluorination catalyst including (i) a crystalline alpha-chromium oxide where at least 0.

Abstract: A process for the manufacture of CF3CH?CF2 and CF3CF?CHF is disclosed. The process involves (a) reacting HF and chlorine and at least one halopropene of the formula CX3CCl?CClX (where each X is independently F or Cl) to produce a product including both CF3CCl2CF3 and CF3CCIFCClF2; (b) reacting CF3CCl2CF3 and CF3CCIFCClF2 produced in (a) with hydrogen to produce a product including both CF3CH2CF3 and CF3CHFCHF2; (c) dehydrofluorinating CF3CH2CF3 and CF3CHFCHF2 produced in (b) to produce a product including both CF3CH?CF2 and CF3CF?CHF; and (d) recovering CF3CH?CF2 and CF3CF?CHF from the product produced in (c). In (a), both CF3CCl2CF3 and CF3CCIFCClF2 are produced in the presence of a chlorofluorination catalyst consisting of (i) compositions comprising a crystalline alpha-chromium oxide where at least 0.05 atom % of the chromium atoms in the alpha-chromium oxide lattice are replaced by copper, and (H) compositions of (i) which have been treated with a fluorinating agent.

Abstract: Disclosed herein are compositions and articles that are useful in environments exposed to heat, wear, and oxidizing agents, which are improved by means of specific kinds of carbon filaments. The compositions and articles comprise high-temperature polymer, high-temperature filler, and a mixture of carbon filament, wherein said mixture of carbon filament comprises multiwall axial carbon filament.

Abstract: A crystalline alpha-chromium oxide where from about 0.05 atom % to about 5 atom % of the chromium atoms in the alpha-chromium oxide lattice are replaced by divalent copper (Cu+2) atoms is disclosed. Also disclosed is a chromium-containing catalyst composition comprising as a chromium-containing component the crystalline copper-substituted alpha-chromium oxide; and methods for preparing a composition comprising the crystalline copper-substituted alpha-chromium oxide. One method involves (a) co-precipitating a solid by adding ammonium hydroxide to an aqueous solution of a soluble copper salt and a soluble trivalent chromium salt that contains at least three moles of nitrate per mole of chromium in the solution and has a copper concentration of from about 0.

Abstract: This invention relates to free-flowing compositions of carbon nanosheets and core-shell particles, and to a plasma-torch process for making them.

Abstract: A process for the manufacture of CF3CH?CHF and/or CF3CF?CH2 is disclosed. The process involves (a) reacting HF and chlorine and at least one halopropene of the formula CX3CCI?CCIX (where each X is independently F or Cl) to produce a product including both CF3CCI2CCIF2 and CF3CCIFCCI2F; (b) reacting CF3CCI2CCIF2 and CF3CCIFCCI2F produced in (a) with hydrogen to produce a product including both CF3CH2CHF2 and CF3CHFCH2F; (c) dehydrofluorinating CF3CH2CHF2 and CF3CHFCH2F produced in (b) to produce a product including both CF3CH?CHF and CF3CF?CH2; and (d) recovering CF3CH?CHF and/or CF3CF?CH2 from the product produced in (c). In (a), both CF3CCI2CCIF2 and CF3CCIFCCI2F are produced in the presence of a chlorofluorination catalyst consisting of (i) compositions comprising a crystalline alpha-chromium oxide where at least 0.05 atom % of the chromium atoms in the alpha-chromium oxide lattice are replaced by copper, and (ii) compositions of (i) which have been treated with a fluorinating agent.

Abstract: A process for the manufacture of CF3CH?CHF and/or CF3CH?CF2 is disclosed. The process involves (a) reacting HF and at least one halopropene of the formula CX3CCI?CCIX (where each X is independently F or CI) to produce a product including both CF3CCI?CF2 and CF3CHCICF3; (b) reacting CF3CCI?CF2 and/or CF3CHCICF3 produced in (a) with hydrogen to produce a product including CF3CH2CHF2 and/or CF3CH2CF3; (c) dehydrofluorinating CF3CH2CHF2 and/or CF3CH2CF3 produced in (b) to produce a product comprising CF3CH?CHF and/or CF3CH?CF2; and (d) recovering CF3CH?CHF and/or CF3CH?CF2 from the product produced in (c). In (a), the CF3CCI?CF2 and CF3CHCICF3 are produced in the presence of a fluorination catalyst comprising at least one chromium-containing component selected from (i) a crystalline alpha-chromium oxide where at least 0.

Abstract: A process for the manufacture of CF3CH2CHF2 and/or CF3CH2CF3 is disclosed. The process involves (a) reacting HF and at least one halopropene of the formula CX3CCI?CCIX (where each X is independently F or Cl) to produce a product including both CF3CCI?CF2 and CF3CHCICF3; (b) reacting CF3CCI?CF2 and/or CF3CHCICF3 produced in (a) with hydrogen to produce a product including CF3CH2CHF2 and/or CF3CH2CF3; and (c) recovering CF3CH2CHF2 and/or CF3CH2CF3 from the product produced in (b). In (a), the CF3CCI?CF2 and CF3CHCICF3 are produced in the presence of a fluorination catalyst comprising at least one chromium-containing component selected from (i) a crystalline alpha-chromium oxide where at least 0.05 atom % of the chromium atoms in the alpha-chromium oxide lattice are replaced by divalent copper, and (ii) a chromium-containing composition of (i) which has been treated with a fluorinating agent.

Abstract: A process is disclosed for the manufacture of CF3CH2CHF2 and CF3CHFCH2F. The process involves (a) reacting hydrogen fluoride, chlorine, and at least one halopropene of the formula CX3CCl?CClX (where each X is independently F or Cl) to produce a product including both CF3CCl2CClF2 and CF3CClFCCl2F; (b) reacting CF3CCl2CClF2 and CF3CClFCCl2F produced in (a) with hydrogen to produce a product including both CF3CH2CHF2, and CF3CHFCH2F; and (c) recovering CF3CH2CHF2 and CF3CHFCH2F from the product produced in (b). In (a), the CF3CCl2CF3 and CF3CClFCClF2 are produced in the presence of a chlorofluorination catalyst including (i) a crystalline alpha-chromium oxide where at least 0.05 atom % of the chromium atoms in the alpha-chromium oxide lattice are replaced by divalent copper, and/or (ii) a chromium-containing composition of (i) which has been treated with a fluorinating agent.

Abstract: A process for the manufacture of CF3CH2CHF2 and/or CF3CH2CF3 is disclosed. The process involves (a) reacting HF and at least one halopropene of the formula CX3CCI?CCIX (where each X is independently F or Cl) to produce a product including both CF3CCI?CF2 and CF3CHCICF3; (b) reacting CF3CCI?CF2 and/or CF3CHCICF3 produced in (a) with hydrogen to produce a product including CF3CH2CHF2 and/or CF3CH2CF3; and (c) recovering CF3CH2CHF2 and/or CF3CH2CF3 from the product produced in (b). In (a), the CF3CCI?CF2 and CF3CHCICF3 are produced in the presence of a fluorination catalyst comprising at least one chromium-containing component selected from (i) a crystalline alpha-chromium oxide where at least 0.05 atom % of the chromium atoms in the alpha-chromium oxide lattice are replaced by divalent copper, and (ii) a chromium-containing composition of (i) which has been treated with a fluorinating agent.

Abstract: A process is disclosed for the manufacture of CF3CH2CHF2 and CF3CHFCH2F. The process involves (a) reacting hydrogen fluoride, chlorine, and at least one halopropene of the formula CX3CCI?CCIX (where each X is independently F or CI) to produce a product including both CF3CCI2CCIF2 and CF3CCIFCCI2F; (b) reacting CF3CCI2CCIF2 and CF3CCIFCCI2F produced in (a) with hydrogen to produce a product including both CF3CH2CHF2, and CF3CHFCH2F; and (c) recovering CF3CH2CHF2 and CF3CHFCH2F from the product produced in (b). In (a), the CF3CCI2CF3 and CF3CCIFCCIF2 are produced in the presence of a chlorofluorination catalyst including (i) a crystalline alpha-chromium oxide where at least 0.05 atom % of the chromium atoms in the alpha-chromium oxide lattice are replaced by divalent copper, and/or (ii) a chromium-containing composition of (i) which has been treated with a fluorinating agent.

Abstract: A process for the manufacture of CF3CH?CHF and/or CF3CF?CH2 is disclosed. The process involves (a) reacting HF and chlorine and at least one halopropene of the formula CX3CCI?CCIX (where each X is independently F or Cl) to produce a product including both CF3CCI2CCIF2 and CF3CCIFCCI2F; (b) reacting CF3CCI2CCIF2 and CF3CCIFCCI2F produced in (a) with hydrogen to produce a product including both CF3CH2CHF2 and CF3CHFCH2F; (c) dehydrofluorinating CF3CH2CHF2 and CF3CHFCH2F produced in (b) to produce a product including both CF3CH?CHF and CF3CF?CH2; and (d) recovering CF3CH?CHF and/or CF3CF?CH2 from the product produced in (c). In (a), both CF3CCI2CCIF2 and CF3CCIFCCI2F are produced in the presence of a chlorofluorination catalyst consisting of (i) compositions comprising a crystalline alpha-chromium oxide where at least 0.05 atom % of the chromium atoms in the alpha-chromium oxide lattice are replaced by copper, and (ii) compositions of (i) which have been treated with a fluorinating agent.

Abstract: A crystalline alpha-chromium oxide where from about 0.05 atom % to about 2 atom % of the chromium atoms in the alpha-chromium oxide lattice are substituted by nickel atoms, and optionally, additional chromium atoms in the alpha-chromium oxide lattice are substituted by trivalent cobalt atoms (provided that the total amount of the nickel atoms and the trivalent cobalt atoms in the alpha-chromium oxide lattice is no more than 6 atom %) is disclosed. Also disclosed is a chromium-containing catalyst composition comprising as a chromium-containing component the crystalline substituted alpha-chromium oxide; and a method for preparing a composition comprising the crystalline substituted alpha-chromium oxide.

Abstract: A process for the manufacture of CF3CH?CHF and/or CF3CH?CF2 is disclosed. The process involves involves (a) reacting HF and at least one halopropene of the formula CX3CCI?CCIX (where each X is independently F or CI) to produce a product including both CF3CCI?CF2 and CF3CHCICF3; (b) reacting CF3CCI?CF2 and/or CF3CHCICF3 produced in (a) with hydrogen to produce a product including CF3CH2CHF2 and/or CF3CH2CF3; (c) dehydrofluorinating CF3CH2CHF2 and/or CF3CH2CF3 produced in (b) to produce a product comprising CF3CH?CHF and/or CF3CH?CF2; and (d) recovering CF3CH?CHF and/or CF3CH?CF2 from the product produced in (c). In (a), the CF3CCI?CF2 and CF3CHCICF3 are produced in the presence of a fluorination catalyst comprising at least one chromium-containing component selected from (i) a crystalline alpha-chromium oxide where at least 0.

Abstract: A chromium-containing catalyst is disclosed which includes both ZnCr2O4 and crystalline ?-chromium oxide. The ZnCr2O4 contains between about 10 atom percent and 67 atom percent of the chromium in the composition and at least about 70 atom percent of the zinc in the composition, and at least about 90 atom percent of the chromium present as chromium oxide in the composition is present as ZnCr2O4 or crystalline ?-chromium oxide. Also disclosed are a method for preparing this composition comprising ZnCr2O4 and crystalline ?-chromium oxide; and a chromium-containing catalyst composition prepared by treatment of the composition comprising ZnCr2O4 and crystalline ?-chromium oxide with a fluorinating agent.

Abstract: A catalyst composition is disclosed that includes chromium, oxygen, and gold as essential constituent elements. The amount of gold in the composition is from about 0.05 atom % to about 10 atom % based on the total amount of chromium and gold. Also disclosed is a process for changing the fluorine distribution (i.e., content and/or arrangement) in a hydrocarbon or halogenated hydrocarbon in the presence of the catalyst composition; and methods for preparing said catalyst composition. One preparation method involves; (a) co-precipitating a solid by adding ammonium hydroxide (aqueous ammonia) to an aqueous solution of a soluble gold salt and a soluble chromium salt that contains at least three moles of nitrate per mole of chromium in the solution and has a gold content of from about 0.