- Email: [email protected]
Heat-adhesive composite fibres and their method of manufacture
(Dynamit Nobel Aktiengesellschaft, Troisdorf, W. Germany) US Pat 4 833 005 (23 May 1989) The laminate comprises at least one fibrereinforced support layer formed from synthetic organic fibres and/or glass fibres penetrated with a polypropylene material containing a crosslinking agent. Microwave susceptor packaging material Huang, H-F. (Du Pont, Wilmington, DE, USA) US Pat 4 833 007 (23 May 1989) Composite materials for wrapping around food to be cooked in a microwave made from a dielectric substrate which is transparent to microwave radiation and a microwave susceptor material. The energy absorbed by the susceptor browns the food adjacent to it without affecting the cooking process of the bulk of the food. Flake proof fabric McKinney, J.M., Hatfield, A.C. and Samson, R.D. (Graniteville Co., Graniteville, SC, USA) US Pat 4 833 006 (23 May 1989) A substrate is woven from yarns of synthetic fibre and coated with a polymeric binder, flame and water retarders. The flake resistance derives from the combination of an unblocked polyisocyanate adduct adhesion promoter and a binder. Metallized fabric Derby, N.C. (B.A.G. Corpn., Dallas, Texas, USA) US Pat 4 833 008 (23 May 1989) The fabric consists of an outer layer of woven fabric and an inner layer of plastic film and a continuous layer of electrically conductive metal, vapour deposited on the other side of the plastic film. Fibre entanglements and their method of production Makimura, M. and Kogame, K. (Kuraray Co.Ltd., Japan) US Pat 4 833 012 (23 May 1989) A three-dimensional fibre entanglement is made from elastic fibres, nonshrinkable, nonelastic fibres and shrinkable, nonelastic fibres. The production method involves forming a fibre blend into a web. Composite chemical barrier fabric Langley, J.D. (Kappler Safety Group, Guntersville Alabama, USA) US Pat 4 833 010 (23 May 1989) The fabric comprises a base sheet with internal pores and two further multilayers. The first multilayer consists of ethylene vinyl alcohol, nylon and polyethylene. The second multilayer consists of polyvinylidine chloride, ethylene vinyl acetate and polyethylene. Composite vehicle-interior finish material Segawa, S. and Tomizawa, T. (Kureha Kagaku Kogyo K.K. Japan) US Pat4833 016 (23 May 1989) The material has high adhesive strength and excellent heat resistance. It consists of a first layer of polyvinyl chloride or leather, a second layer of copolymer latex impregnated soft foam, and a third layer of copolymer latex bonded base material. Polymer impregnated and carbonized carbon/ carbon composite Petersen, R.B. (Hitco, Irving CA, USA) US Pat 4 833 030 (23 May 1989) The composite is prepared by impregnating
186
COMPOSITES. MARCH 1990
porous carbon/carbon composite with a polymer from the reaction product of (1) furfuryl alcohol and (2) a metal complex. Composite silver base electrical contact material Bornstein, N.S. (Hamilton Standard Controls Inc., Conn, USA) US Pat 4 834 939 (30 May 1989) A blend of oxidised nickel powder and internally oxidised silver-cadnium powder gives a product containing 4-15 weight % cadmium oxide, 2-8 weight % oxidised nickel with the balance of silver. Fabric based on glass and carbon fibres and articles made from it Auduc, H. and Aucagne, J. (Brochier S A., Decines, France) US Pat 4 835 046 (30 May 1989) The fire-resistant fibre-based fabric comprises a mixture of about 50-90 weight % of textured fibres and 10-50 weight % technical fibres. Glass fibres having organosilsesquioxane coatings and claddings Bagley, B.G., Kurkjian, C.R. and Quinn, W.E. (AT and T Bell Labs, Murray Hill, N J, USA) US Pat 4 835 057 (30 May 1989) Light guiding glass fibres with a thin organosilsesquioxane polymer coating. Glass fibres resistant to basic media and their application to reinforcing of cement Chopinet, M-H. (Vetrotex Saint-Gobain, Hamberv, France) US Pat 4 835 122 (30 May 1989) A continuous glass fibre comprising 56-68 weight % silica, 14-17% zirconia, 12-20% soda, 0 - 8 % potassia and 1-9% alumina with the sum of soda and potassia between 14 and 22% and sum of silica and alumina is less than 70%. Biconstituent polypropylene/polyethylene fibres Jezic, Z. and Young, G.P. (Dow Chemical Co. Midland, MI, USA) US Pat 4 839 228 (13 June 1989) A blend of highly crystalline polypropylene and LLDPE fibres is produced by melt blending and melt extruding in the ratio 78/22 to about 55/45 respectively. Fibre-reinforced metallic composite Nakatani, M. and Nishio, I-I. (Sumitomo Chemical Co., Osaka, Japan) US Pat 4 839 238 (13 June 1989) The matrix is a metal selected from aluminium, magnesium, copper, nickel and titanium and an alloy thereof with a combination of 0.05 to 10 weight % lead and 0.01 to 5 % of at least one metal selected from the group sodium, potassium, calcium, strontium, caesium, barium and radium. The reinforcement is an inorganic fibre. Composite zinc-silica electro-galvanised steel sheet with excellent corrosion resistance Abe, M., Shiohara, Y., Adaniya, T. and Naemura, H. (Nippon Kokan Kabushiki Kaisha, Tokyo, Japan) US Pat 4 839 241 (13 June 1989) 0.1 to 20 weight % silica particles are uniformly dispersed in the zinc plating layer.
Microwave absorbent composite material Flynn, N. and Clark, N. (Lantor Ltd, Bolton, England) US Pat 4 840 840 (20 June 1989) The material comprises a plurality of layers of fabric with adjacent layers containing a comminuted conductive material the amount of conductive material being different in successive fabric layers. Heat-adhesive composite fibres and their method of manufacture Ejima, S., Sugihara, T. and Abe, M. (Chisso Corpn. Osaka, Japan) US Pat 4 840 846 (20 June 1989) The fibre comprises a core made of different side by side polypropylene base polymers and a sheath portion of a polyethylene base polymer having a melting point at least 20°C lower than the two melting points of the core material.
PROCESSES Method of preparing metal matrix composite materials using metallo-organic solutions for fibre pretreatment Goddard, D.M., and Sexton, R.W. (Fiber Materials Inc. Biddeford, ME, USA) US Pat 4 831 707 (23 May 1989) A method is described in which a fibre (glass, ceramic, or metal) is coated with a noble metal containing metallo-organic liquid compound. The fibre is heated to give a noble metal thickness of 0.3 to 0.5 microns and bonded to a dissimilar metal matrix. The fibre is made of a material which will maintain its structural integrity at the temperature of metal deposition. Method and apparatus for determining vertical density profiles in wood composites using acoustic emission Lemaster, R.L. and Dornfield, D.A. (University of California at Berkeley, CA, USA) US Pat 4 831 880 (23 May 1989) The method comprises a fly cutter across the edge of a wood composite panel to produce acoustic emissions that themselves produce an RMS voltage which is recorded. Process for preparation of a water absorptive composite material Itoh, K. and Shibano, T. (Mitsubishi Chemical Co.Tokyo Japan) US Pat 4 835 020 (30 May 1989) An aqueous solution of polymerisable monomers is applied to a prefabricated fibrous substrate. Polymerisation is carried out with a water soluble initiator and enhanced by heating to give the water absorptive composite. Process for producing silica glass fibres Ohta, H., Kawaguchi, T., Mukaiyama, T. et al. (Asahi Glass Co., Tokyo, Japan) US Pat4 838 914 (13 June 1989) A silica glass fibre spinning solution is made by adding a polymerisation regulator to a silica sol obtained by hydrolysis and condensation of a silicon alkoxide in the presence of an acid catalyst. The solution is spun into gel fibres by extrusion through nozzles, the fibres are oiled and wound on a bobbin forming a fibre cake which is aged at 0-50C for i hour to 10 days. The vibres are unwound and given a two step sintering treatment.
186
COMPOSITES. MARCH 1990
porous carbon/carbon composite with a polymer from the reaction product of (1) furfuryl alcohol and (2) a metal complex. Composite silver base electrical contact material Bornstein, N.S. (Hamilton Standard Controls Inc., Conn, USA) US Pat 4 834 939 (30 May 1989) A blend of oxidised nickel powder and internally oxidised silver-cadnium powder gives a product containing 4-15 weight % cadmium oxide, 2-8 weight % oxidised nickel with the balance of silver. Fabric based on glass and carbon fibres and articles made from it Auduc, H. and Aucagne, J. (Brochier S A., Decines, France) US Pat 4 835 046 (30 May 1989) The fire-resistant fibre-based fabric comprises a mixture of about 50-90 weight % of textured fibres and 10-50 weight % technical fibres. Glass fibres having organosilsesquioxane coatings and claddings Bagley, B.G., Kurkjian, C.R. and Quinn, W.E. (AT and T Bell Labs, Murray Hill, N J, USA) US Pat 4 835 057 (30 May 1989) Light guiding glass fibres with a thin organosilsesquioxane polymer coating. Glass fibres resistant to basic media and their application to reinforcing of cement Chopinet, M-H. (Vetrotex Saint-Gobain, Hamberv, France) US Pat 4 835 122 (30 May 1989) A continuous glass fibre comprising 56-68 weight % silica, 14-17% zirconia, 12-20% soda, 0 - 8 % potassia and 1-9% alumina with the sum of soda and potassia between 14 and 22% and sum of silica and alumina is less than 70%. Biconstituent polypropylene/polyethylene fibres Jezic, Z. and Young, G.P. (Dow Chemical Co. Midland, MI, USA) US Pat 4 839 228 (13 June 1989) A blend of highly crystalline polypropylene and LLDPE fibres is produced by melt blending and melt extruding in the ratio 78/22 to about 55/45 respectively. Fibre-reinforced metallic composite Nakatani, M. and Nishio, I-I. (Sumitomo Chemical Co., Osaka, Japan) US Pat 4 839 238 (13 June 1989) The matrix is a metal selected from aluminium, magnesium, copper, nickel and titanium and an alloy thereof with a combination of 0.05 to 10 weight % lead and 0.01 to 5 % of at least one metal selected from the group sodium, potassium, calcium, strontium, caesium, barium and radium. The reinforcement is an inorganic fibre. Composite zinc-silica electro-galvanised steel sheet with excellent corrosion resistance Abe, M., Shiohara, Y., Adaniya, T. and Naemura, H. (Nippon Kokan Kabushiki Kaisha, Tokyo, Japan) US Pat 4 839 241 (13 June 1989) 0.1 to 20 weight % silica particles are uniformly dispersed in the zinc plating layer.
Microwave absorbent composite material Flynn, N. and Clark, N. (Lantor Ltd, Bolton, England) US Pat 4 840 840 (20 June 1989) The material comprises a plurality of layers of fabric with adjacent layers containing a comminuted conductive material the amount of conductive material being different in successive fabric layers. Heat-adhesive composite fibres and their method of manufacture Ejima, S., Sugihara, T. and Abe, M. (Chisso Corpn. Osaka, Japan) US Pat 4 840 846 (20 June 1989) The fibre comprises a core made of different side by side polypropylene base polymers and a sheath portion of a polyethylene base polymer having a melting point at least 20°C lower than the two melting points of the core material.
PROCESSES Method of preparing metal matrix composite materials using metallo-organic solutions for fibre pretreatment Goddard, D.M., and Sexton, R.W. (Fiber Materials Inc. Biddeford, ME, USA) US Pat 4 831 707 (23 May 1989) A method is described in which a fibre (glass, ceramic, or metal) is coated with a noble metal containing metallo-organic liquid compound. The fibre is heated to give a noble metal thickness of 0.3 to 0.5 microns and bonded to a dissimilar metal matrix. The fibre is made of a material which will maintain its structural integrity at the temperature of metal deposition. Method and apparatus for determining vertical density profiles in wood composites using acoustic emission Lemaster, R.L. and Dornfield, D.A. (University of California at Berkeley, CA, USA) US Pat 4 831 880 (23 May 1989) The method comprises a fly cutter across the edge of a wood composite panel to produce acoustic emissions that themselves produce an RMS voltage which is recorded. Process for preparation of a water absorptive composite material Itoh, K. and Shibano, T. (Mitsubishi Chemical Co.Tokyo Japan) US Pat 4 835 020 (30 May 1989) An aqueous solution of polymerisable monomers is applied to a prefabricated fibrous substrate. Polymerisation is carried out with a water soluble initiator and enhanced by heating to give the water absorptive composite. Process for producing silica glass fibres Ohta, H., Kawaguchi, T., Mukaiyama, T. et al. (Asahi Glass Co., Tokyo, Japan) US Pat4 838 914 (13 June 1989) A silica glass fibre spinning solution is made by adding a polymerisation regulator to a silica sol obtained by hydrolysis and condensation of a silicon alkoxide in the presence of an acid catalyst. The solution is spun into gel fibres by extrusion through nozzles, the fibres are oiled and wound on a bobbin forming a fibre cake which is aged at 0-50C for i hour to 10 days. The vibres are unwound and given a two step sintering treatment.