- Email: [email protected]
High modulus polyethylene fiber bundles as reinforcement for brittle matrices
formed of woody fibres and a thermoplastic bonding agent additive with an inadequate resistance to oxidation in the above temperature range. The relatively high proportion of resin in the cover layers prevents the deterioration of the thermoplastic bonding agent during m o u l d i n g
The title product is made from a core component of a fibre-forming polymer A containing at least 5 wt % of an isotope compound, m a x i m u m diameter of 25 pro, capable of shielding against thermal neutrons, and a sheath component of a fibre forming polymer B, capable of bonding to A.
Self-crimping polyamide filaments Li, G.T.C. (E.I. Du Pont de Nemours and Company, Wilmington, DE, USA) USPat4 521 484 (4 June 1985) A synthetic filament capable of forming a helical crimp upon relaxation comprises a sheath (making up 35-50 wt % of the filament) of oriented poly(hexamethylene adipamide) and an eccentrically located core of ternary copolyamide. The latter contains at least 60 wt % hexamethylene adipamide units, 15-30 wt % hexamethylene isophthalamide units and 5-10 wt % hexamethylene terephthalamide units, with the weight ratios of the latter two components being from 1.5 to 6.0.
High modulus polyethylene fiber bundles as reinforcement for brittle matrices Eickman, N.C., Fabisiak, W. and Dix~ R. (Celanese Corporation, New York, NY, USA) US Pat 4 524 101 (18 June 1985) A discrete, coherent bundle of high modulus polyethylene fibres is formed by chopping compressed yarn in which the cross-section of individual filaments is deformed so that there is at least partial fusion between the fibre ends during chopping
Composite panel structure Fearon, W.W. a n d Macy, A.M. (Peabody Noise Control Inc, Dublin, OH, USA) US Pat4 522 284 (11 June 1985) A composite panel having acoustical absorbing properties comprises a cellular core structure with open cells on at least one side of the structure, an acoustically semi-transparent facing of fibrous material and a binder to provide a hard outer surface of partially bonded fibres with interstices between them. The facing. bonded to the structure at the open side of the core, extends into the open cells to provide mechanical interlocking and to enhance the absorption of acoustic energy. Pre-stressed fiber-resin sucker rod and method of making same (Conley, E.E., Tulsa, OK, USA) USPat4 522 529 (11 June 1985) In this plastic sucker rod having threaded ends and a substantially solid cross-section body therebetween, pre-stressed fibre strands are arranged parallel to the axis of the rod in its middle portion, but follow the peaks andvalleys of the threads in the threaded ends. Automatic tension maintaining transmission belt Matsuoka, H. and Furukawa, Y. (Bando Chemical Industries Ltd` Kobo, Japan) USPat4 522 614 (11 June 1985) Polyester cords embedded in a transmission belt and having a shrink temperature o f > 80° C shrink during operation due to the frictional heat generated by slippage and thereby increase the belt tension. Material for reinforcing core in a structure Scott, J.T. and King. C. (Metalcore Limited, Etobicoke, Canada) US Pat4 522 860 (11 June 1985) The reinforcement is a sheet material having a longitudinal and transverse axis lying in a c o m m o n plane and is made up of first and second strips extending along one of the axes. Portions of the first strip lie above the common plane, portions of the second strip lie below the c o m m o n plane and the two strips are connected in the c o m m o n plane. Neutron-shielding fabric and composite fiber and method of manufacture thereof Ohuchi, S. and Kataoka, M. (Toray Industries Inc, Tokyo, Japan) US Pat 4 522 868 (11 June 1985)
COMPOSITES. APRIL 1986
Low shrinkage curable molding compositions containing a polXacrylate) Domeier, LA. (Union Carbide Corporation, Danbury, CT, USA) US Pat 4 524 162 (18 June 1985) The empirical formula o f a polyacrylate is given which can be used to prepare injectionmoulded FRP articles. Thermosetting adhesive resins Viswanathan, T. and Richardson T. (Chemical Process Corporation, Brookfield, WI, USA) US Pat 4 524 164 (18 June 1985) A thermosetting resin for binding lignocellulosic materials is produced by heating an aqueous sugar or starch solution and a crosslinking agent (urea, phenol or mixtures of the two) in the presence of an inorganic acid or its a m m o n i u m salt and a metal ion catalyst at 50-200°C for 30 min to 18 hours. An organic acid anhydride is then added to the partially polymerized resin before application to the lignocellulosic material. Surface type structural component, especially for aircraft Sarh, B. and Pasenau, H. (MesserschmittBoelkow-Blohm G m b H , Munich` FRG) US Pat 4 524 556 (25 June 1985) A structural shell component for aircraft comprises a grid structure of longitudinal and curved cross ribs and a laminated planking bonded thereto. The ribs comprise wound box frames, the wall sections of which are made from layers of fibre-reinforced tape. Reinforced plastic structure such as a valve Humphrey, F.H. and Humphrey, B.H. (IIC Mechanical Products Limited, Dowsview, Canada) US Pat 4 526 195 (2 July 1985) A valve structure is described which contains a seating m e m b e r and a spring bearing member. Each of these has an outer body portion and a centre core portion joined by arms containing groups of unidirectional reinforcing fibres in a plastic matrix. Multi-passenger aircraft seat having composite panel frame Brennan, E.J., Long. W.A. and Brunelle, R.J. (PTC Aerospace Inc,, Bantam, CT, USA) USPat 4 526 421 (2 July 1985) The frame of an aircraft seating unit has a honeycomb core with upper and lower skins of resin-impregnated fibres. Additional layers of resin-impregnated fibres are bonded to the skins at spaced apart regions to enhance the flexural resistance of the frame and to reinforce the frame at locations where other elements of the unit (eg arms and legs) are attached to it.
Anchoring element for fibrous composite materials Preis, L., Hoffmann, J. and R o m p [ K. (Bayer AG, Leverkusen, FRG) US Pat4 526 492 (2 July 1985) An anchor for a rod of FRP has a sleeve containing a bore to receive the rod, an element for widening the received end of the rod and a sealant completely filling the space in the bore between the rock the widening element and the sleeve. Multi-layer printed circuit board and process for production thereof Takahashi, A., Shimazaki, T., Wajima, M. and Morishita, H. (Hitachi Ltd, Tokyo, Japan) US Pat 4 526 835 (2 July 1985) The formula of a polyimide resin is given which can be used to impregnate reinforcing sheets and which can be cured at a temperature equal to or lower than the glass transition temperature (Tgz) of the resin after cure. The resin is used to prepare prepregs from which multilayer printed circuit boards are produced. Composite fibrous product Kumazawa` T., Doi, H., Miyadera` Y., Fujioka` A. and Nagai, T. (Hitachi Ltd, Hitachi Chemical Co Ltd and Fuji Fiber Glass Co Ltd, all of Tokyo, Japan) US Pat 4 528 223 (9 July 1985) A high rigidity composite reinforcement is formed by mix-twisting continuous aromatic polyamide filament yarn and continuous glass yarn. The polyamide comprises poly-pphenylene terephthalamide, poly-p-benzamide or copolymers of m o n o m e r units thereo[ Chemically modified asphalts and glass fibres treated therewith Uffner, W.E. and White, R.N. (Owens-Coming Fiberglas Corporation, Toledo, OIL USA) US Pat 4 528 241 (9 July 1985) A glass fibre bundle is described in which the entire surface area of the individual filaments is coated with a reaction product of asphalt, a vinyl aromatic m o n o m e r and a linear block copolymer of styrene and butadiene having polystyrene end-blocks and a polybutadiene mid-block. The product is said to have increased elastic recovery rate, increased viscosity stability, reduced tack and lower viscosity than a similar product in which the styrene-butadiene copolymer is of the A-B type. Radiation hardenable primer Fuhr, K. and Freier, H.J. (BayerAG, Leverkusen, FRG) US Pat 4 528 307 (9 July 1985) This radiation hardenable primer contains at least one prepolymer, having acryloyk methacryloyl groups or both, and organic or inorganic fibres with m a x i m u m length 50-600 #m. Drill bit for Kevlar laminates Greene, E.A. (Hughes Helicopters Inc, Culver City, CA. USA) US Pat 4 529 341 (16 July 1985) The drill bit described has a pair of helical leading edges terminating in an outer cutting point, a centre point and concavely curved cutting edges extending between the inner and outer cutting points. The cutting edges curve back sharply in a direction opposite to the normal rotation of the drill so that severed material is drawn radially inward from the edge of a bore. The reduced rake angle of the helical cutting edges increases the shearing effect of the outer cutting points and minimizes lifting of the workpiece material.
171
The title product is made from a core component of a fibre-forming polymer A containing at least 5 wt % of an isotope compound, m a x i m u m diameter of 25 pro, capable of shielding against thermal neutrons, and a sheath component of a fibre forming polymer B, capable of bonding to A.
Self-crimping polyamide filaments Li, G.T.C. (E.I. Du Pont de Nemours and Company, Wilmington, DE, USA) USPat4 521 484 (4 June 1985) A synthetic filament capable of forming a helical crimp upon relaxation comprises a sheath (making up 35-50 wt % of the filament) of oriented poly(hexamethylene adipamide) and an eccentrically located core of ternary copolyamide. The latter contains at least 60 wt % hexamethylene adipamide units, 15-30 wt % hexamethylene isophthalamide units and 5-10 wt % hexamethylene terephthalamide units, with the weight ratios of the latter two components being from 1.5 to 6.0.
High modulus polyethylene fiber bundles as reinforcement for brittle matrices Eickman, N.C., Fabisiak, W. and Dix~ R. (Celanese Corporation, New York, NY, USA) US Pat 4 524 101 (18 June 1985) A discrete, coherent bundle of high modulus polyethylene fibres is formed by chopping compressed yarn in which the cross-section of individual filaments is deformed so that there is at least partial fusion between the fibre ends during chopping
Composite panel structure Fearon, W.W. a n d Macy, A.M. (Peabody Noise Control Inc, Dublin, OH, USA) US Pat4 522 284 (11 June 1985) A composite panel having acoustical absorbing properties comprises a cellular core structure with open cells on at least one side of the structure, an acoustically semi-transparent facing of fibrous material and a binder to provide a hard outer surface of partially bonded fibres with interstices between them. The facing. bonded to the structure at the open side of the core, extends into the open cells to provide mechanical interlocking and to enhance the absorption of acoustic energy. Pre-stressed fiber-resin sucker rod and method of making same (Conley, E.E., Tulsa, OK, USA) USPat4 522 529 (11 June 1985) In this plastic sucker rod having threaded ends and a substantially solid cross-section body therebetween, pre-stressed fibre strands are arranged parallel to the axis of the rod in its middle portion, but follow the peaks andvalleys of the threads in the threaded ends. Automatic tension maintaining transmission belt Matsuoka, H. and Furukawa, Y. (Bando Chemical Industries Ltd` Kobo, Japan) USPat4 522 614 (11 June 1985) Polyester cords embedded in a transmission belt and having a shrink temperature o f > 80° C shrink during operation due to the frictional heat generated by slippage and thereby increase the belt tension. Material for reinforcing core in a structure Scott, J.T. and King. C. (Metalcore Limited, Etobicoke, Canada) US Pat4 522 860 (11 June 1985) The reinforcement is a sheet material having a longitudinal and transverse axis lying in a c o m m o n plane and is made up of first and second strips extending along one of the axes. Portions of the first strip lie above the common plane, portions of the second strip lie below the c o m m o n plane and the two strips are connected in the c o m m o n plane. Neutron-shielding fabric and composite fiber and method of manufacture thereof Ohuchi, S. and Kataoka, M. (Toray Industries Inc, Tokyo, Japan) US Pat 4 522 868 (11 June 1985)
COMPOSITES. APRIL 1986
Low shrinkage curable molding compositions containing a polXacrylate) Domeier, LA. (Union Carbide Corporation, Danbury, CT, USA) US Pat 4 524 162 (18 June 1985) The empirical formula o f a polyacrylate is given which can be used to prepare injectionmoulded FRP articles. Thermosetting adhesive resins Viswanathan, T. and Richardson T. (Chemical Process Corporation, Brookfield, WI, USA) US Pat 4 524 164 (18 June 1985) A thermosetting resin for binding lignocellulosic materials is produced by heating an aqueous sugar or starch solution and a crosslinking agent (urea, phenol or mixtures of the two) in the presence of an inorganic acid or its a m m o n i u m salt and a metal ion catalyst at 50-200°C for 30 min to 18 hours. An organic acid anhydride is then added to the partially polymerized resin before application to the lignocellulosic material. Surface type structural component, especially for aircraft Sarh, B. and Pasenau, H. (MesserschmittBoelkow-Blohm G m b H , Munich` FRG) US Pat 4 524 556 (25 June 1985) A structural shell component for aircraft comprises a grid structure of longitudinal and curved cross ribs and a laminated planking bonded thereto. The ribs comprise wound box frames, the wall sections of which are made from layers of fibre-reinforced tape. Reinforced plastic structure such as a valve Humphrey, F.H. and Humphrey, B.H. (IIC Mechanical Products Limited, Dowsview, Canada) US Pat 4 526 195 (2 July 1985) A valve structure is described which contains a seating m e m b e r and a spring bearing member. Each of these has an outer body portion and a centre core portion joined by arms containing groups of unidirectional reinforcing fibres in a plastic matrix. Multi-passenger aircraft seat having composite panel frame Brennan, E.J., Long. W.A. and Brunelle, R.J. (PTC Aerospace Inc,, Bantam, CT, USA) USPat 4 526 421 (2 July 1985) The frame of an aircraft seating unit has a honeycomb core with upper and lower skins of resin-impregnated fibres. Additional layers of resin-impregnated fibres are bonded to the skins at spaced apart regions to enhance the flexural resistance of the frame and to reinforce the frame at locations where other elements of the unit (eg arms and legs) are attached to it.
Anchoring element for fibrous composite materials Preis, L., Hoffmann, J. and R o m p [ K. (Bayer AG, Leverkusen, FRG) US Pat4 526 492 (2 July 1985) An anchor for a rod of FRP has a sleeve containing a bore to receive the rod, an element for widening the received end of the rod and a sealant completely filling the space in the bore between the rock the widening element and the sleeve. Multi-layer printed circuit board and process for production thereof Takahashi, A., Shimazaki, T., Wajima, M. and Morishita, H. (Hitachi Ltd, Tokyo, Japan) US Pat 4 526 835 (2 July 1985) The formula of a polyimide resin is given which can be used to impregnate reinforcing sheets and which can be cured at a temperature equal to or lower than the glass transition temperature (Tgz) of the resin after cure. The resin is used to prepare prepregs from which multilayer printed circuit boards are produced. Composite fibrous product Kumazawa` T., Doi, H., Miyadera` Y., Fujioka` A. and Nagai, T. (Hitachi Ltd, Hitachi Chemical Co Ltd and Fuji Fiber Glass Co Ltd, all of Tokyo, Japan) US Pat 4 528 223 (9 July 1985) A high rigidity composite reinforcement is formed by mix-twisting continuous aromatic polyamide filament yarn and continuous glass yarn. The polyamide comprises poly-pphenylene terephthalamide, poly-p-benzamide or copolymers of m o n o m e r units thereo[ Chemically modified asphalts and glass fibres treated therewith Uffner, W.E. and White, R.N. (Owens-Coming Fiberglas Corporation, Toledo, OIL USA) US Pat 4 528 241 (9 July 1985) A glass fibre bundle is described in which the entire surface area of the individual filaments is coated with a reaction product of asphalt, a vinyl aromatic m o n o m e r and a linear block copolymer of styrene and butadiene having polystyrene end-blocks and a polybutadiene mid-block. The product is said to have increased elastic recovery rate, increased viscosity stability, reduced tack and lower viscosity than a similar product in which the styrene-butadiene copolymer is of the A-B type. Radiation hardenable primer Fuhr, K. and Freier, H.J. (BayerAG, Leverkusen, FRG) US Pat 4 528 307 (9 July 1985) This radiation hardenable primer contains at least one prepolymer, having acryloyk methacryloyl groups or both, and organic or inorganic fibres with m a x i m u m length 50-600 #m. Drill bit for Kevlar laminates Greene, E.A. (Hughes Helicopters Inc, Culver City, CA. USA) US Pat 4 529 341 (16 July 1985) The drill bit described has a pair of helical leading edges terminating in an outer cutting point, a centre point and concavely curved cutting edges extending between the inner and outer cutting points. The cutting edges curve back sharply in a direction opposite to the normal rotation of the drill so that severed material is drawn radially inward from the edge of a bore. The reduced rake angle of the helical cutting edges increases the shearing effect of the outer cutting points and minimizes lifting of the workpiece material.
171