Production of graphitized filamentary materials

forms a solid decomposition or oxidation product. The decomposed polymer composite forms a porous carbonaceous char containing a metallic compound. This is heated with CO 2 or CO 2/inert gas at >740°C but < the melting point of the metallic compound. This results in partial elimination of free carbon and is followed by sintering the residue.

Method and apparatus for forming a densified fibrous article (Hitco) UK Pat 1 282 974 (18 Oct 1972) A shaped fibrous composite is compressed and densified between male and female members which can be moved relative to each other in a longitudinal direction while restraining one surface of the fibres adjacent to one of the movable members. Improvements in or relating to the manufacture of tubes of fibre reinforced plastics (Kunstoffe Buro Porta GmbH and Co KG) UK Pat i 293 019 (18 Oct 1972)' Reinforcement layer dry blends in widths corresponding to the required tube lengths are fed to a winding mandrel of the same length and wound with wetting by liquid plastic. Friction and pressure are applied simultaenously to cause thorough impregnation. Composite material articles Sturgeon, J. B. and Wood, G. (Secretary of State for Defence) UK Pat 1 293 639 (18 Oct 1972) This composite consists of a carbon fibre reinforced matrix containing an insert of metal wires bonded at a point where a pin-joint can be made. Fibreglass resin gum coating (Fibreglass Ltd) UK Pat 1 293 744 (25 Oct 1972) A binder for glass fibre reinforced composite used as insulation consists of a water soluble resin, 5 - 4 5 % of urea and 10-20% ammonium lignosulphonate.

Process for production of carbon fibres Araki, T. and Takita, H. (Kureha Kagaku Kogyo Kabushiki Kaisha) UK Pat 1 293 900 (25 Oct 1972)

190

Polymethyl vinyl ketone is spun into fibres, stretched to orient in an axial direction, then dehydrated by cyclisation followed by carbonisation in an inert atmosphere.

Improvements in or relating to the making of composite articles (TRW lnc) UK Pat 1 294 285 (25 Oct 1972) A composite aerofoil consists of a body compound of many layers of refractory fibre reinforced metal tapes, each layer being several layers of tapes in side-by-side relation encased in a sheath and diffusion bonded to the body. Composite material and its use in polishing glass Valerio, P. F. and Werner, R. H. (Eastman Kodak Co) UK Pat 1 295 146 (1 Nov 1972) The composite consists of 5 50% by weight of diamonds of diameter 1-50/a dispersed in a solid matrix, which is the reaction product of an epoxy equivalent of 150-450 and a hardener. Production of graphitized filamentary materials (Celanese Corp) UK Pat 1 295 301 (S Nov 1972) A substantially acrylonitrile polymer is heated below its melting point, yielding a stabilised product retaining its filament structure and having a carbon content of up to 65% and a combined 02 content of >7%. This is impregnated with an organic substance or solution so that on heating at 1 900°C for 2 seconds it retains its structure. The product is tensioned to prevent sagging and graphitized without loss of its structure. Rubber articles reinforced with filaments (Teijin Ltd) UK Pat 1 295 450 (8 Nov 1972) A rubber article is reinforced with a substantially linear polyester of recurring units of ethylene naphthalene-2-6dicarboxylate having an intrinsic viscosity of>0.5 at a concentration of carboxyl groups of <60 gm equivalent per million gm polyester. These composites in application such as belting and tyres show excellent dynamic properties.

Method of manufacturing composite filaments (Mitsui Mining and Smelting Co Ltd) UK Pat 1 295 620 (8 Nov 19 72) A molten metal of lower melting point than the extrusion temperature of a thermoplastic, flows through a nozzle inside a spinneret. Simultaneous resin extrusion yields a composite resin sheathed metal filament. Process for the production of fibrous oxides Erfurth, H. and Mansmann, M. (Bayer AG) UK Pat I 295 786 (8 Nov 1972) Fibrous oxides of Be, Mg, Ca, Zn, B, A1, Si, Sn, Zr, Sb, V, Cr, Mn, Fe, rare earths, a mixture of these or admixed with titanium oxide are produced by heating at >600°C compounds of the above with oxyacids capable of forming volatile anhydrides. Fibrous oxides are recovered from the reaction zone. Process for the production of a composite sheet material having one or more layers of microporous structure (Kalle AG) UK Pat 1 296 237 (15 Nov 1972) A textile web with a microporous polymer surface layer is impregnated with a liquid medium compatible with a polymer solution applied to one side while still wet. The solution is coagulated yielding a microporous layer, the coated web is wholly immersed in coagulent immediately after the polymer solution Payer has assumed its final thickness. Fibrous rigid material Oswitch, S. and Galownia, R. F. (Ferro Corp) UK Pat 1 296 325 (15 Nov 1972) A fibrous mat suitable for road surfaces is impregnated with cobalt naphthenate and an aromatic amine of formula RN(C2H4OH)2 where R is phenyl or m-tolyl. Composite materials Feakes, F. and Padawer, G. (National Res Corp) UK Pat 1 296 617 (15 Nov 1972) Stiff composite reinforcement is selected from A1, B; B, Si and Ti carbides; Ti and A1 borides and Be. A supported core substrate with at least two opposing faces and a source of stiff material in vapour from in line of site relation, are introduced into an evacuated chamber so the

C O M P O S I T E S . JU L Y 1 9 7 3