Abstract: Liquid polyglycidyl compounds, diethyltoluylenediamine, a curing accelerator and optionally further additives form a liquid matrix system with which fibres and fibre shapes are impregnated by known techniques, particularly by filament winding, pultrusion and injection processes. The components thus produced are for example tubes capable of withstanding pressure and torsional stress.

Abstract: A process for making radiation cured silicone rubber articles is disclosed wherein a hydroxyl-terminated polysiloxane having a molecular weight from about 50,000 to about 2,000,000, optionally modified by mixing with up to 85% of an end-stopped silicone rubber, is mixed with from about 10 to about 70 parts per hundred of rubber of a finely divided silica filler with a particle size in the reinforcing range and other inlet fillers as determined by desired final properties; the composition so prepared is formed into the desired shape at room temperature; the article so formed is precured to improve the mechanical properties of the material with which it is made by exposure to ammonia gas, ammonium hydroxide, or to the vapors or solutions of a volatile amine at room temperature; and the precured article is irradiated with high energy electrons or gamma radiation to effect a permanent cure of the material from which the article is formed.

Abstract: Disclosed is a method and apparatus for continuously lubricating cable during continuous dry curing of cable insulation to reduce friction between the cable insulation and the dry curing apparatus, thereby eliminating cable oscillation and vibration to increase product quality and the speed of production.

Abstract: A single or multiple strand molded notch V-belt and a method for its production is described. The method is characterized by use of an open-ended mold having rigid transverse notches and longitudinal ribs forming a plurality of mold cavities. The belt has undulating mold-formed notches which In one embodiment carry a fabric facing of a particular design to retard initiation and propagation of undercord cracks during operation of the belt around described sheaves.

Abstract: In an apparatus and a method for the curing of a continuous length of curable material, the length of material is passed through a curing chamber defined by a tubular body 47. This body 47 is disposed in the upper part of another heated tubular body 2 which contains a heat exchange liquid. This liquid is fed to one or more injectors disposed at one or both ends of the body 47, injected along the chamber and then allowed to drain back therefrom into the body 2. The body 2 contains a further tubular body 58 downstream of and partitioned from the tubular body 47. Body 58 also has an injector 60 through which water is injected to cool the length of material. Tubular body 47 may be provided with drain holes through which heat exchange liquid can be quickly drained at the end of a curing run. It may also be provided with air vents or a longitudinal slot in its upper part to release trapped air.

Abstract: Disclosed is a method for continuously lubricating cable during continuous dry curing of cable insulation and insulation shield to reduce friction between the cable surface and the dry curing apparatus, thereby eliminating cable oscillation and vibration and increasing product quality and the speed of production, comprising coating insulation compound pellets and insulation shield compound pellets with incompatible lubricant immediately prior to extrusion of insulation and insulation shield on to the cable.

Abstract: A method is provided for producing a compression molded, fiber reinforced, plastic panel comprising a plate having an outer surface and an inner surface bearing integrally molded reinforcing members, which method comprisesA. Providing a mold with heated first and second mold members that close to form a configuration for the panel, one of the mold members having a surface interrupted by rib-forming chambers having a width about equal to or less than the thickness of the plate and a depth at least equal to the thickness;B. Introducing molding compounds between the mold members in layers positioned one atop another a first part of the layers comprising thermo setting resin and relatively short chopped fibers and the other part comprising thermo setting resin and relatively long chopped fibers;C. Closing the mold members upon the molding compound at a relatively high pressure to cause flow of the molding compound whereby the relatively short fibers flow into the rib-forming chambers;D.

Abstract: In an apparatus and a method for the curing of a continuous length of curable material, the length of material is passed through a curing chamber defined by a tubular body 47. This body 47 is disposed in the upper part of another heated tubular body 2 which contains a heat exchange liquid. This liquid is fed to one or more injectors disposed at one or both ends of the body 47, injected along the chamber and then allowed to drain back therefrom into the body 2. The body 2 contains a further tubular body 58 downstream of and partitioned from the tubular body 47. Body 58 also has an injector 60 through which water is injected to cool the length of material. With this relatively compact arrangement curing may be achieved while thermal stresses in the apparatus are reduced.

Abstract: A mixture of substances is fed to an extruder and, after being homogenized and liquefied, is extruded on an electric conductor or as a pipe. To meet electric cable specifications, the insulating material used is a polyolefin, such as polyethylene, cross-linking of which is brought about by the addition of a silane, a free-radical generator, and a silanol condensation catalyst. After extrusion, cross-linking takes place in the presence of moisture. To facilitate penetration of the moisture and accelerate cross-linking, an agent capable of reducing the rate of crystallization of the polymer, such as vinyl acetate, is used as a further additive.

Abstract: A stretch-staging method is disclosed for straightening continuous fiber columns impregnated within a resin-based tape material to increase the strength and reliability of the material. The tape material is supported about the circumference of a half-cylindrical fixture and separated therefrom by a thin lubricating film to reduce surface friction. Loads of substantially equal weight are longitudinally applied at opposite ends of the tape material about the fixture, and the combination is heated in an oven to an elevated temperature for a predetermined period of time thereby stretching and staging the tape material so that distorted fiber columns are straightened and retained in a straightened condition as the resin is advanced.

Abstract: Disclosed are polymer blends of bis(allyl carbonate) polymers with polymers of olefinically unsaturated monomers, and the precursor blends of bis(allyl carbonate) monomers with polymers of olefinically unsaturated monomers, and fabricable resins prepared therefrom. Also disclosed is a method of fabricating, e.g., molding, injection molding, extruding, and the like, the fabricable resins. The bis(allyl carbonate) polymer blend is taken to a fabricable state, i.e., a fusible pseudoplastic that does not lose liquid on fabrication, either by admixture or admixture and reaction. The fabricable resin is then fabricated, e.g., extruded, molded, or the like, and then polymerized to a hard polymer. Also disclosed are blends of bis(allyl carbonates), monomeric and polymeric, with polymers having olefinic unsaturation.

Abstract: A material web impregnated with a settable synthetic resin travels in vertical direction, from the bottom towards the top, through a first heat treatment zone where the solvent of the synthetic resin or plastic is evaporated and there occurs a chemical reaction. The tacky material web departing from the first heat or thermal treatment zone then passes through a cooling zone where it is cooled by means of a cooling medium to such a degree that it does not stick to the deflection or diverting rolls over which the material web subsequently is guided. After deflection of the material web the latter is moved in vertical direction downwardly through a second heat treatment zone where the chemical reaction proceeds. Prior to winding-up of the material web the latter is further cooled.

Abstract: A mold equipment comprises a water tub having a metal mold transfer conveyor therein, a first lift chamber for placing the metal mold onto a first lift from the outlet side of said conveyor and lifting it to an upper stage of the first lift chamber, a first push-in cylinder for transferring the metal mold from the outlet of the first lift chamber into a ceiling oven including a conveyor and held in an atmosphere of curing, a second lift chamber for placing said metal mold onto a second lift from the outlet of the ceiling oven and lowering it to a lower stage outlet, a second push-in cylinder for transferring the metal mold from the outlet of the second lift chamber into a mold release work station including a conveyor, a third lift chamber for placing the metal mold onto a third lift at the outlet of the mold release work station and lowering it to the position of the mold transfer conveyor in the water tub, and a third push-in cylinder for transferring the metal mold into the water tub from the outlet of sai

Abstract: A reinforced tubular article such as a hose is manufactured by at least partially vulcanizing a rubber composition to form an inner tube and forming on the outer surface of said inner tube an assembly of reinforcing members which are united with the inner tube by a solidifiable liquid polymer material which when solidified bonds to both the reinforcing members and the outer surface of the tube.

Abstract: What is disclosed is an improved method of preparing silicon carbide which is characterized by the preparation of a specific pre-silicon carbide polymer. The method allows the preparation of silicon carbide from specific polysilane polymers without the cumbersome extractions and purifications found in the newer methods of silicon carbide preparation.

Abstract: A method is described for the extrusion of a mixture of a water-based latex emulsion, fibers and fillers.

Abstract: A resin reinforced fiber structure is formed by coating and curing the resin of resin coated fibers in air form a hard gel surface is passed in contact with a mass of particles maintained at a temperature from about 95.degree. C. to the thermal degradation temperature of the resin to complete internal cure of the resin.

Abstract: A decorated synthetic resin sheet is formed by a continuously cast sheet of polymerized synthetic resin syrup integrally joined on at least one side with one side of an unwrinkled uniformly thick preformed film of polymerized synthetic resin that is compatible with the cast syrup. The film and sheet are integrally joined together to form a homogeneous product.

Abstract: A conductor wire is extrusion coated with a polyethylene resin containing a copolymer comprising predominantly ethylene and an unsaturated silane compound having the formula R Si R'.sub.n Y.sub.3-n, wherein: R is an ethylenically unsaturated hydrocarbyl group or hydrocarbyloxy group; R' is an aliphatic saturated hydrocarbyl group; Y is a hydrolyzable organic group; and n is zero, 1, or 2, thereby to fabricate a coated wire which is then caused to contact water in the presence of a silanol condensation catalyst in a crosslinking process step.

Abstract: Provess for improving the chemical resistance of copolyesters derived from aromatic dicarboxylic acids, certain substituted aromatic diols and, optionally, aromatic hydroxy acids. The process involves treating shaped objects made from the aromatic polyesters by subjecting them to a temperature sufficient to raise the surface temperature thereof to at least 275.degree. C. and preferably 300.degree. C. in air or other oxygen-containing atmospheres.

Abstract: A method of curing a green rubber tire (40) having a closed interior cavity (42) with two spaced ports (46,48) extending from the interior cavity to the tire exterior. The method includes the step of forming the tire on the porous, disintegratable core (44) and then positioning the tire within a pressure vessel (50). The pressure vessel and the interior cavity and porous core are then filled with a liquid (52) at an elevated temperature which is sufficient to cure the green rubber. The liquid is then circulated at the elevated temperature through the pressure vessel around the exterior of the tire and through the porous core and the interior cavity of the tire.

Abstract: A method of increasing the strength and high temperature resistance of aromatic thermoplastic polymers by adding thereto an appropriate amount of certain biphenylene terminated compounds, then heating the mixture to a crosslinking reaction temperature. The biphenylene additive has been found to function as a plasticizer for the polymer, making it easier to work, mold, extrude, etc. prior to the heating step.

Abstract: Polyethylene terephthalate having an acetaldehyde content of less than 2.5 ppm and suitable for packing of food and beverages intended for human consumption is produced by heating polyethylene terephthalate having an intrinsic viscosity of about 0.5--0.85 at a temperature of 180.degree.-230.degree. C., preferably 200.degree.-220.degree. C., for about 4 to 12 hours. The polyethylene terephthalate must not include more than 25 ppm of ester interchange catalyst or 20 ppm of phosphorous during this heating.

Abstract: A detecting material capable of being activated by neutrons is mixed with a liquid polycondensation resin capable of thermal hardening. The obtained mixture is heated until the resin is transformed into a fusible product that is then cooled to room temperature. Thus hardened mixture is ground into powder suitable for pressing into tablets.

Abstract: A process for reducing micro-voids in cross-linked cable insulation without reducing the voltage breakdown strength thereof in which process the insulation, after cross-linking, is heated at a temperature in the range from about 120.degree. C. to about 150.degree. C. and under a pressure less than 10 mm. Hg for a period from about 8 hours to 48 hours. Also, a cable having such insulation which has micro-voids less than about 10.sup.2 per mm.sup.3 and a perforation gradient greater than the perforation gradient of a cable which has not been so treated.

Abstract: This disclosure relates to a method of manufacturing a pipe having a rubber lining within a layer of looped fabric and a resin layer.The method comprises placing a tubular layer of unvulcanized rubber on an expansible mandrel, then wrapping a layer of looped fabric on the rubber layer, with the loops outwardly directed. The mandrel is expanded to draw the looped fabric partially into the rubber, the protruding loops then being impregnated with uncured thermosetting resin, and glass fabric is then wrapped on the resin.

Abstract: A horizontal type vulcanizer for continuous production of an elongated member made of a natural or synthetic polymer. The elongated member passes through a pressurized liquid heat medium to achieve vulcanization. Leakage from the liquid bath seal is prevented by having an intermediate separation portion and balancing the pressure in the bath with that in the intermediate portion. Thermal deterioration of the seal is prevented by cooling the liquid bath in the region adjacent the seals to increase the viscosity of the bath in that region. A water jacket positioned in contact with the front face of the extruder head prevents scorching of the elongated member prior to vulcanization.

Abstract: A cure-in-place process which allows a rubber seal element to be deformed to its service configuration before it is cross-linked and, hence, is a plastic and does not build up internal stress as a result of the deformation. This provides maximum residual strength to resist the differential pressure. Furthermore, the process allows use of high modulus formulations of the rubber seal element which would otherwise crack if cured and then deformed to its service configuration, resulting in a seal which has better gap bridging capability. Basically, the process involves positioning an uncured seal element in place, deforming it to its service configuration, heating the seal element, curing it in place, and then fully seating the seal.

Abstract: A method for the production of curved tubular elastomeric articles such as hose is described which uses a rigid, deformable mandrel. An uncured hose assembly is placed on the mandrel, and the assembly, including the mandrel, is deformed to a preselected curvilinear configuration, and then partially cured. The partially cured hose is straightened and the mandrel is removed. The partially cured hose is then returned to the curing chamber to complete the curing.

Abstract: This invention relates to a gasket apparatus for providing a fluid tight seal between a pipe and a porthole in the wall of a manhole riser. The gasket is in the form of an elongated sleeve of elastomeric material having at one end an outwardly turned, reflexly curved annular flange. The body portion extends axially beyond the flange. An annular recess is provided in the inner surface of the flange and another annular recess is provided on the outer surface of the body portion at the opposite end thereof. The flange and body portion are made sufficiently flexible that they can be turned inside out to form a tubular shape with the two recesses on the outer circumference thereof.The recess in the flange is so formed as to receive in coaxial relation a rigid reinforcing ring.

Abstract: A molding process for compression molding blanks from a polymerizable, thermosetting resinous composition in which pearlescent particulate materials are mixed: Upper and lower mold parts, at least one of which has mold cavities formed in it, are held in an open condition. The resinous composition is sandwiched between two sheets of a film material and is placed on the lower mold part. At least one of the layers of film material is stretchable. The mold parts are moved together until the upper mold part contacts, without applying pressure to, the top of the resinous composition. The mold parts are held at this semi-closed condition for a period of time at an elevated temperature, thereby causing the viscosity of the resinous composition to rise significantly. The mold parts are then moved to the fully closed condition at which molding pressure is applied to the resinous material, and the resinous composition is then forced into and shaped by the mold cavities in the mold parts.

Abstract: In cables where the conductor is provided with an insulation of thermoplastic or cross-linked polyethylene, the insulation may be covered with a strippable outer semiconductive layer consisting of a cross-linked polymer composition which comprises a copolymer of ethylene and vinyl acetate and further carbon black and an organic peroxide. The strippable layer is applied on the conductor insulation by extrusion of the polymer composition in an extrusion machine and by a subsequent crosslinking in the polymer composition.

Abstract: Fine particles of acetylene end-capped polyimide oligomers are copression-molded at ambient temperature. The preformed moldings are cured without melting the resin by heating to an elevated temperature which is lower than the oligomer's melting point.

Abstract: Method and apparatus are disclosed for continuously manufacturing a cable of the type having a central conductor around which are concentrically arranged successive outer layers; electrostatic shielding, insulation and jacket layers. The method and apparatus includes unique means for vulcanizing the insulation layer and for subsequent cooling.

Abstract: A method of curing phenolic resin near exposed polyethyleneterephthalate subject to degradation by vaporous materials, comprises removing free phenol from the phenolic resin and heating the resin to a cured state.

Abstract: A method for manufacturing a power cable wherein an inner polymeric electrically-conducting layer is extruded into surrounding relationship with respect to a conductor core element, an initially thermoplastic, heat cross-linkable polymeric layer of insulation is then extruded into surrounding relationship with respect to the conducting layer, and thereafter cross-linking is caused to occur in the layer of insulation by heating the same under pressure. The conductor element with the applied inner conducting layer is heated prior to the extrusion thereon of the insulation layer to increase the rate of production of the cable. To facilitate this heating operation, the material used for the inner polymeric conducting layer is characterized by sufficient resistance to indentation at the extrusion temperature of the insulation layer to prevent the inner electrically-conducting layer from being deformed or damaged during the extrusion thereon of the insulation layer.

Abstract: A method wherein an article is molded of a heat-fusing material or plastisol in a mold having first and second groups of liquid passages disposed adjacent the mold surface for controlling the temperature over respective first and second areas of the mold surface. The mold is supported for rotation about an axis by a stationary pedestal. A movable module supports plastisol storage tanks, heat exchangers, valves, conduits, etc., for supplying the plastisol to the mold. The movable module also supports a dump tank which is disposed beneath the mold for receiving and retrieving the liquid plastisol which is emptied or dumped from the mold when it is rotated to an inverted position. There is included first and second liquid circuits including a pump and heat exchanger for supplying liquid at different temperatures to the passages associated with the mold.

Abstract: A leather-like sheet material bearing a remarkable resemblance to high-quality leathers of natural origin, especially in respect of flatness, bending crimp, grain and feeling, is produced by providing a substrate consisting of a fibrous base material and a porous coating layer with a thin layer of a polymer, subjecting the surface to a specific heat treatment, providing the resulting material with another thin layer of a polymer, and, if desired, embossing the material.

Abstract: Synthetic resin bodies reinforced with fiber, roving or the like can be made, in accordance with the invention, by impregnating the reinforcing material with synthetic resin and then casting a hardenable liquid around the resulting body to form a mold in situ therefor. The synthetic resin material is thus permitted to harden in the solidified mold material whereupon the mold material is removed.

Abstract: The process comprises forming a mixture containing a thermoplastic material and a cross-linking agent and causing the mixture to enter a die head. A pressure is exerted on the mixture in the die head along the axis of the die head so as to sinter the mixture. The die head is heated to a temperature lower than the temperature at which the cross-linking agent becomes substantially decomposed so as to cause fusion of the mixture and produce a formed material. The formed material is passed through a bath of molten salt downstream of the die head. The temperature of the molten salt is such as to achieve the decomposition of the cross-linking agent and the cross-linking of the formed material. A device is described for carrying out the process.

Abstract: A flexible preferably tubular article is described having an outer abrasion-resistant protective sleeve which is cured-in-place on a flexible core or tube to form a unitary flexible composite.

Abstract: Disclosed is a process for producing fiber-reinforced elastic articles comprising: 1 to 20 parts by weight of 1,2-polybutadiene fibrils dispersed in a matrix of 100 parts by weight of a rubber material. In the process, the 1,2-polybutadiene in the form of particles are dispersed in the matrix of rubber material; the dispersion is extruded through a die at a temperature of at least 5.degree. C. above the melting point of 1,2-polybutadiene, but not exceeding 240.degree. C., to convert the particles of 1,2-polybutadiene into fibrils; the extruded dispersion is rolled by means of a pair of rollers to increase the degree of molecular orientation of the 1,2-polybutadiene fibrils, and; a composition comprising an elastic material matrix, the 1,2-polybutadiene fibrils dispersed in the elastic material matrix and a vulcanizing agent is shaped and vulcanized at an elevated temperature.

Abstract: Method and apparatus for continuously vulcanizing unsheathed and unvulcanized elastomeric or plastomeric material by passing the material through an enclosure, within which it is subjected to vulcanizing conditions, in the form of a helix, the helix convolutions in part contacting a drive member and idler member and in part being freely suspended. A resilient elastomeric diaphragm is disposed on the surface of one of the said members.

Abstract: A one-step curing method for the manufacture of neutron absorbing articles, such as those of long thin plate form for use in storage racks for spent nuclear fuel, includes curing a mixture of boron carbide particles, phenolic resin in liquid state and phenolic resin in particulate solid form at an elevated temperature to produce a neutron absorbing article containing at least 6% of B.sup.10 content from the boron carbide thereof, 60% to 80% of boron carbide particles and 40% to 60% of irreversibly cured phenolic polymer, with the proportion of weight of phenolic resin in liquid state to that of phenolic resin in solid state being within the range of about 1:0.5 to 1:4, the temperature of the cure being in the range of about 130 to 200.degree. C. and the cure being effected over a period of about two to twenty hours.

Abstract: A cured or uncured linear aromatic polyester composition melt-blended and composed of(A) 100 parts by weight of a saturated linear aromatic polyester in which at least 70 mole % of the acid component consists of an aromatic dicarboxylic acid, and(B) 0.1 to 50 parts by weight of a reactive compound which is solid at room temperature or is a liquid having a boiling point of at least 200.degree. C. under atmospheric pressure, and which contains in its molecule at least one aliphatic unsaturated group substantially non-reactive with the polyester (A) and the aliphatic unsaturated group of the reactive compound (B) under conditions of melt-blending with the polyester (A) and at least one epoxy group reactive with the polyester (A) under the melt-blending conditions. The cured linear aromatic polyester composition can be prepared by extruding the uncured linear aromatic polyester composition under melting conditions, and subjecting the resulting extrudate to a curing treatment.

Abstract: A process for the production of seals between surfaces operating at elevated temperatures is disclosed wherein a vulcanizable elastomer mixture is vulcanized by the heat transferred from the surfaces, and by the pressure created by adjustment of the space between the surfaces. In the invention, spacers are arranged between the surfaces to determine the final position thereof and hence the thickness of the seals and the pressure resistance of the spacers is higher than that of the elastomer mixture before or during vulcanization.

Abstract: Inclusion of an effective amount of substantially anhydrous acetic acid in a zinc oxide cured liquid polysulfide polymer based composition results in a cured composition which is suitable for extrusion under heat and pressure and which on cooling reverts to a rubbery solid with essentially unchanged physical properties. The compositions are useful for the manufacture of sealants and extrudible goods such as hoses.

Abstract: Mechanical properties of compression molded composites having thick sections and made from molding compounds comprising thermosetting resin and reinforcing fiber in a thickened dispersion are improved by a preheating stage and mold cycle times that are longer than the time necessary to reach the highest peak exotherm temperature of the composite during molding. Slow post cooling allows for development of properties especially when mold opening times are shorter than that required for removal of all thermal gradients.

Abstract: Polysulfide rubber formulations that become fluid at elevated temperatures but regain the rubbery state upon cooling are disclosed. The products possess a lower permanent set at room temperature and process more easily, particularly in extrusion processes, at elevated temperatures.

Abstract: The invention relates to a method of manufacturing a metallized plastic reflector in which a layer of fibrous material is provided on the convex surface of a mold. The layer is then just saturated with a thermohardening synthetic resin, and after partial hardening, a metal layer is applied onto the partially hardened resin layer by means of a spraying process. A supporting layer of a fiber reinforced thermohardening synthetic resin is then provided on the metal layer and after hardening the reflector is finally removed from the mold.