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4759839 Process for producing pitch useful as raw material for carbon fibers
New Patents Pyrolyzed carbon fibers are intercalated with alkali metal by contacting the fibers with hot metal vapors at a specified temperature to produce an infrared emissive chaff. This chaff can be released into the air to produce a heat generating cloud, which can serve as an infrared decoy or screen to protect military targets against weapons having infrared detectors. The chaff gives off a longer lasting, more moderate heat supply due to the intercalation of its active element, and is much easier to store and handle than prior art pyrophorics.
4756818 A METHOD FOR THE PRODUCTION OF A CARBON FIBER PRECURSOR Siegfried Peter, Herbert Beneke, Franz Oeste, Wolfgang Fexer, Wolfgan Jaumann, Manfre Meinbreckse, Joachim Kempfert, Uttenreuth Weher, Federal Republic Of Germany assigned to Rutgerswerke Aktiengesellschaft A method for the production of a carbon fiber precursor from coal tar pitch comprising extracting coal tar pitch at elevated temperatures and pressures with a mixture of a supercritical gas and an entraining agent to obtain a solution free of quinoline-insoluble components, recovering from the solution by lowering the pressure and/or raising the temperature to obtain at least one fraction selected from the group consisting of quinoline-soluble fraction and toluenesoluble fraction, treating the said fraction(s) at 380 degrees to 450 degrees C. under a nonoxidizing atmosphere at atmosphere pressure until 40 to 65% by volume of the product is converted into pitch containing mesophase, extracting the latter pitch with a mixture of supercritical gas and an entraining agent to remove isotropic pitch and recovering isotropic pitch with a mesophase content of at least 75% by volume, a pyridine-insoluble matter content of 20 to 50% by weight, a mean molecular weight of 900 to 1200 and a melting point of 330 degrees to 360 degrees C. and the isotropic pitch product produced therefrom and carbon fibers made from the isotropic pitch.
4758326 METHOD OF PRODUCING PRECURSOR PITCHES FOR CARBON FIBERS Yukihiro Ohsugi, Kozo Yudate, Mamor Kamishita, Chiba, Japan assigned to Kawasaki Steel Corporation; Nitto Boseki Co Ltd
III
A method of producing a precursor pitch suitable for the production of carbon fibers, which method includes dissolving a coal tar pitch in a particular solvent to remove a solvent insoluble matter, distilling off the solvent to obtain a purified pitch containing no free carbon, and heat-treating the purified pitch to obtain an objective precursor pitch.
4759839 PROCESS FOR PRODUCING PITCH USEFUL AS RAW MATERIAL FOR CARBON FIBERS Seiji Ishikawa, Shuuich Hirano, Yuki Matsumoto, Tutomu Kaibara, Kenji Sugiyama, Taku Morishige, Chiba, Japan assigned to Ube Industries Ltd; Seibu Oil Company Limit A process for producing a pitch useful as a raw material for carbon fibers, which comprises (1) heat-treating at least one starting material selected from the group consisting of a heavy oil obtained by fluid catalytic cracking of a petroleum, a distillate or a residual oil obtained by distilling the heavy oil, and a pitch obtained by heattreating any of the foregoing materials at a temperature of 350 degrees to 550 degrees C., (2) separating and removing insoluble substances from the reaction mixture obtained in step (1) to obtain a first treated mixture, (3) heating the first treated mixture obtained in step (2) at a temperature of 250 degrees to 400 degrees C. and removing light fractions which distill at said temperature to obtain a second treated mixture, and (4) treating the second treated mixture obtained in step (3) at a temperature of 430 degrees to 550 degrees C.
4759977 FLEXIBLE
CARBON
MATERIAL
Hiroyuki Fukuda, Yukihir Shibuya, Kiyomi Ohuchi, Masumi Sagi, Naohir Murayama, Masatom Shigeta, Iwaki, Japan assigned to Kureha Kagaku Kogyo Kabushiki Kaisha A flexible carbon material is produced by carbonizing a composite material comprising carbon fibers having an average length of 6 to 50 mm and a binding agent. Carbon lumps are derived from the binding agent and are dispersed in a matrix of the carbon fibers so as to restrain a plurality of the carbon fibers while yet permitting relative slippage to occur as between the carbon fibers and carbon lumps such that the
4756818 A METHOD FOR THE PRODUCTION OF A CARBON FIBER PRECURSOR Siegfried Peter, Herbert Beneke, Franz Oeste, Wolfgang Fexer, Wolfgan Jaumann, Manfre Meinbreckse, Joachim Kempfert, Uttenreuth Weher, Federal Republic Of Germany assigned to Rutgerswerke Aktiengesellschaft A method for the production of a carbon fiber precursor from coal tar pitch comprising extracting coal tar pitch at elevated temperatures and pressures with a mixture of a supercritical gas and an entraining agent to obtain a solution free of quinoline-insoluble components, recovering from the solution by lowering the pressure and/or raising the temperature to obtain at least one fraction selected from the group consisting of quinoline-soluble fraction and toluenesoluble fraction, treating the said fraction(s) at 380 degrees to 450 degrees C. under a nonoxidizing atmosphere at atmosphere pressure until 40 to 65% by volume of the product is converted into pitch containing mesophase, extracting the latter pitch with a mixture of supercritical gas and an entraining agent to remove isotropic pitch and recovering isotropic pitch with a mesophase content of at least 75% by volume, a pyridine-insoluble matter content of 20 to 50% by weight, a mean molecular weight of 900 to 1200 and a melting point of 330 degrees to 360 degrees C. and the isotropic pitch product produced therefrom and carbon fibers made from the isotropic pitch.
4758326 METHOD OF PRODUCING PRECURSOR PITCHES FOR CARBON FIBERS Yukihiro Ohsugi, Kozo Yudate, Mamor Kamishita, Chiba, Japan assigned to Kawasaki Steel Corporation; Nitto Boseki Co Ltd
III
A method of producing a precursor pitch suitable for the production of carbon fibers, which method includes dissolving a coal tar pitch in a particular solvent to remove a solvent insoluble matter, distilling off the solvent to obtain a purified pitch containing no free carbon, and heat-treating the purified pitch to obtain an objective precursor pitch.
4759839 PROCESS FOR PRODUCING PITCH USEFUL AS RAW MATERIAL FOR CARBON FIBERS Seiji Ishikawa, Shuuich Hirano, Yuki Matsumoto, Tutomu Kaibara, Kenji Sugiyama, Taku Morishige, Chiba, Japan assigned to Ube Industries Ltd; Seibu Oil Company Limit A process for producing a pitch useful as a raw material for carbon fibers, which comprises (1) heat-treating at least one starting material selected from the group consisting of a heavy oil obtained by fluid catalytic cracking of a petroleum, a distillate or a residual oil obtained by distilling the heavy oil, and a pitch obtained by heattreating any of the foregoing materials at a temperature of 350 degrees to 550 degrees C., (2) separating and removing insoluble substances from the reaction mixture obtained in step (1) to obtain a first treated mixture, (3) heating the first treated mixture obtained in step (2) at a temperature of 250 degrees to 400 degrees C. and removing light fractions which distill at said temperature to obtain a second treated mixture, and (4) treating the second treated mixture obtained in step (3) at a temperature of 430 degrees to 550 degrees C.
4759977 FLEXIBLE
CARBON
MATERIAL
Hiroyuki Fukuda, Yukihir Shibuya, Kiyomi Ohuchi, Masumi Sagi, Naohir Murayama, Masatom Shigeta, Iwaki, Japan assigned to Kureha Kagaku Kogyo Kabushiki Kaisha A flexible carbon material is produced by carbonizing a composite material comprising carbon fibers having an average length of 6 to 50 mm and a binding agent. Carbon lumps are derived from the binding agent and are dispersed in a matrix of the carbon fibers so as to restrain a plurality of the carbon fibers while yet permitting relative slippage to occur as between the carbon fibers and carbon lumps such that the