4830845 Precursor for production of preoxidized fibers or carbon fibers

NEW PATENTS This Section contains abstracts and, where appropriate, illustrations of recently issued United States patents and published patent applications filed from over 30 countries under the Patent Cooperation Treaty. This information

was obtained from recent additions to the Pergamon PATSEARCH” online database in accordance with interest profiles developed by the Editors. Further information about Pergamon PATSEARCH” can be obtained from Pergamon Orbit InfoLine Inc., 8000 Westpark Drive, McLean, Virginia 22102 U.S.A. Copies of complete patents announced in this Section are available from Pergamon Orbit InfoLine Inc. for $8 per copy. Payment with order is required. Orders outside North America add $2 for air postage. Order by patent number for Pergamon Orbit InfoLine only.

4825635

4826669

CARBON FIBER YARN

METHOD FOR CARBON BLACK PRODUCTION

Jean Guevel, Marc Francois, Guy Bontemps, Viriat, France assigned to S A Schappe A process is provided for producing carbon fiber yarns which comprise an intimate association of carbon fibers having an average length of between 100 and 120 mm. The process comprises transforming tows of multifilaments whose count is between 0.5 and 1 dtex by cracking, by drawing, and controlled breaking to obtain long fibers having an average length of between 100 and 120 mm. These fibers are then transformed on standard spinning equipment for long fibers into a range of yarns which have counts ranging from Mn 1 to Mn 100. The yarns of the present invention can be used for making prepreg fabrics for composites, fabrics for dry and wet filtration, fabrics for making Faraday shields, fabrics for carbonization for carbon/carbon pieces and high-performance seals.

4826181 SEAL UTILIZING COMPOSITES OF FLEXIBLE GRAPHITE PARTICLES AND AMORPHOUS CARBON Ronald Howard Corporation

assigned to Union

Carbide

Composites of flexible graphite particles and an amorphous carbon phase useful for applications such as valve packing end rings.

John R Casperson assigned to Phillips Petroleum Company High structure carbon black is produced in an oil furnace reactor characterized by abrupt expansions in the reaction flow passage following the reactor throat.

4830845 PRECURSOR FOR PRODUCTION OF PREOXIDIZED FIBERS OR CARBON FIBERS Hiroyasu Ogawa, Tetsuro Shigei, Shizuoka, Japan assigned to Toho Belson Co Ltd An acrylic fiber having applied thereto a polyaminopolysiloxane compound oxyalkylene having a viscosity of from 5 to 500 poises at 25 degrees C. and which is represented by formula (I) as an oiling agent: See Patent for Chemical Structure (1) wherein Rl, R2, R3, R4, R5, and R6 each represents a lower alkyl group or an aryl group, R7 represents a hydrogen atom, a lower alkyl group or an aryl group, R8 represents H or -CH3, or See Patent for Chemical Structure (wherein RlO, Rl 1 and R12 each represents a hydrogen atom, a lower alkyl group or an aryl group), R9 represents an alkylene group having not more than 5 carbon atoms, an arylene group, or a single bond, A represents a group See Patent for Chemical Structure (wherein R13 and R14 each represents H, -CH3, -C2H5), B represents a

II

New Patents

group See Patent for Chemical Structure (wherein R15: H or -CH3, and m and n each represents 0 or an integer of from 1 to 10, pro-

vided that m+ n) or = l), X and Z each represents an integer from 1 or more, and Wand Y each represents 0 or an integer of 1 or more.

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