A method of manufacturing tapes of carbon fibres Whitney, I. (Secretary of State for Defence) UK Pat 1 315 716 (2 May 1973) Many tows of synthetic polymer fibre tows are spread out to form many narrow tapes; these are juxtaposed to form a sheet which is heated to form carbon fibres, dividing the sheet at the junctions between at least some pairs of narrow tapes to produce wide tapes each of which comprise multitudes of narrow tapes,
Polymer impregnated board (Consolidated paper (Bahamas) Ltd) UK Pat 1 315 729 (2 May 1973) A corrugated paper board adapted to form a carbon consisting of two liners with a corrugated medium in between. The board contains 5-40% by weight of a hydrocabon polymer derived predominantly from cyclic and acyclic diofins with 5 - 6 C atEms this conferring wet strength and dry compression strength, Production of graphitized filamentary materials (Celanese Corp) UK Pat 1 315 744 (2May 1973) Process for graphitization of carbonized filaments by passage through inert gas at 2 000°C until substantial graphitization has occurred while still retaining its filament structure, then catalyzing further graphitization with a volatile alkyl borate. Process for the manufacture of carbon fibres Magre, E. P. and Yutema, K. (Akzo NV) UK Pat 1 315 758 (2 May 1973) Carbon fibres are prepared by processing fibres of polyacrylacylamidrazones and heating in inert gas at 360-1 000°C to carbonize them.
US PA TENTS
Process for disper~dng fibre in an aqueous mix Kempster, E. (NRDC) US Pat 3 716 386 (13 Feb 1973) Fibre is immersed in a solution of polyethylene oxide and methyl celtulose prior to incorporation in a mix, the examples include cement and plaster matrices and steel or nylon fibres,
COMPOSITES. J A N U A R Y 1974
Processfor producing polyester of improved rubber adhesion and p r o ducts Shirano, K. and Yoshitaka, T. (Kuraray Co Ltd) US Pat 3 716 396 (13 Feb 1973) Fibre adhesion is improved by applying a solution of an amine (polyethylene amine), heat treating, then applying a solution of polycarboxylic acid halide (adipic acid dichloride). Heat treatment of molten carbonaceous material prior to its conversion to carbon fibre and other shapes Otani, S. (Kureha Kagaku Kogyo Kabushiki Kaisha) US Pat 3 716 607 (13 Feb 1973) Carbon articles are produced from yarn, filaments, ribbon, sheets, fibres and tubes by (i) heating synthetic organic polymer at 300-500°C in inert gas, (ii) raising the temperature to below the carbonization point and shaping, (iii) contacting the shape with oxidizing gas and carbonization at 500°C. Zirconium diffusion barrier in titaniumsilicon-carbide composite materials McMurray, N. D. and Tumey, N.J. (General Motors Corp) US Pat 3 717 443 (20 Feb 1973) Silicon carbide filaments in a titanium metal or alloy matrix are coated with zirconium which acts as a barrier to the inter diffusion of the fibre or matrix thus preventing structure weakening. Method and apparatus for making fused bundles of energy conducting fibres Smith, L. W. (American Optical Corp) US Pat 3 7] 7 531 (20 Feb 1973) Fibre bundles are placed endwise in a non-wetting preferably heavy liquified metal in an open container adjacent to a corner where the metal effects tight bundling and fluid clamping of the fibres against the wall; this is followed by heat fusing, Flexible rubber articles reinforced with fibre of certain polyamidehydrazide polymers Daniels, B. M. and Preston, J. (Monsanto Co) US Pat 3 717 542 (20 Feb 1973) Aromatic polymers with melting points >200°C and an intrinsic viscosity of>3.5 are made into fibres with a density of>1.37 and high initial modulus >700 g/denier at >2% elongation; these are used as rubber reinforcement,
Graphite fluoride synthetic resin composite material Hiratsucha, T. and Shimata, T. (Nippon Carbon Co) US Pat 3 717 5 76 (20 Feb 1973) Synthetic resin, graphite fluoride and a third component selected from synthetic and natural graphite, or non-crystalline carbon are mixed and moulded to make composite bearings. Truxene polymer and method for its preparation Harper, W. L. and Smith, W. E. (USAEC) US Pat 3 717 622 (20 Feb 1973) Truxene polymerizes in an oxygenated containing atmosphere at a lower temperature than for carbonization/3 truxene polymer will yield graphite, a yields amorphous carbon while mixtures of predominantly/3 truxene yield a graphitized composite. Sizing coating and combined sizing and coating composition for glass fibre Fahey, D. M. (PPG Industries Inc) US Pat 3 718 449 (27 Feb 1973) Individual fibres are coated with an agueous size coating composition of furfuryl alcohol, ammonia, a polymer latex blend, an ammino silane coupling agent and a resorcinol-formaldehyde resin; fibres are gathered into strands, dried, and collected on a forming tube as reinforcement for rubbers. See also US Pat 3 718 448
Processfor production of carbon filaments from coal tar pitch Joo, L. A. and McKee, J. A. (Great Lakes Carbon Corp) US Pat 3 718 493 (27Feb 1973) High temperature coal tar pitch is filtered and heat treated to remove volatiles by distillation, then filament spun, partly oxidized and carefully carbonized yielding filaments with a tensile strength >6.89 x 108 N/ m 2 (>105 lbf/in2). These may be graphitized. Apparatus for impregnating yarns and more particularly glass yarns with synthetic resins Voilleau, A. and Coffy, R. L. (Societe Nationale Industrielle Aerospatiale) US Pat 3 718 521 (27Feb 1973) Process includes one yarn spool for impregnation, an impregnation unit formed by two chambers in an enclosed space (i) a chemical process chamber