Abstract: A method is shown for forming a spark plug boot having at least one internal shoulder. An outer tube is first formed of an elastomeric material having an internal bore and a selected length. An inner tube, also formed of an elastomeric material, is inserted within the bore of the outer tube. The inner tube has an external diameter selected to allow it to be slideably received within the bore of the outer tube and has a length which is less than the length of the outer tube. The inner and outer tubes thus assembled are then exposed to electromagnetic radiation for a time sufficient to bond the external diameter of the inner tube to the internal bore of the outer tube.

Abstract: A composite ribbon suitable for winding into coils, comprising an acrylate resin film destined to be used as an intermediate layer in safety glass panels, interposed between two thin protective films, is produced by means of a continuous process of polymerization induced by light radiation, using the two protective films themselves as a polymerization cell.

Abstract: A method for producing a plastic substrate having Tg of 110.degree. C. or more is disclosed, which comprises radical polymerizing a polyfunctional (meth)acrylate compound in a mold by a cast molding method, removing the resulting substrate from the mold when the glass transition temperature of the substrate reaches 10.degree. to 100.degree. C., and then post-curing the substrate. The method of the present invention can provide high quality plastic substrates with high productivity.

Abstract: A crosslinked polyolefin insulated power cable with remarkably improved AC breakdown voltage and impulse withstand voltage has been obtained by a process which comprises extrustion-coating, on the outer surface of a conductor, (1) a material for the formation of an inner semiconductive layer, comprising a base polymer and N-vinylcarbazole, (2) a crosslinkable polyolefin material for the formation of a crosslinked polyolefin insulating layer and (3) a material for the formation of an outer semiconductive layer in this order and then subjecting the coated conductor to a crosslinking treatment to form, on the outer surface of the conductor, an inner semiconductive layer, a crosslinked polyolefin insulating layer and an outer semiconductive layer in this order.

Abstract: A lightweight composite cylinder housing is provided to decrease fuel consumption, attenuate noise, and permit increased speed of operation.

Abstract: A continuous vulcanized assembly process for producing an anti-fouling material comprises cleaning the surface of a sheet of copper alloy anti-fouling material by shotblasting, use of a rotary abrasive member or by a chemical treatment. A layer of elastomeric material is extruded onto the metallic material and the elastomeric material is then cured at an elevated temperature using a rotary press. The material thus produced can be stored on reels for subsequent attachmnent to appropriate structures.

Abstract: A method of forming a fiber reinforced synthetic resin rod-like molding including a rod-like core portion having at least in the outer portion thereof a reinforcing fiber bundle integrally adhered together by a thermosetting resin and a thermoplastic resin layer coating the core portion is disclosed. The outer surface portion of the core portion and the inner surface portion of the thermoplastic resin layer are integrally adhered together due to an anchor effect generated by contacting between the thermosetting resin and the thermoplastic resin in a semifluid state under pressure.

Abstract: A process and apparatus for producing a cross-linked, extruded or sprayed product.

Abstract: A rocket motor insulator of varied thickness with an integrated flap to rce propellant stresses.

Abstract: A method for continuously vulcanizing hoses which comprises two steps: microwave vulcanization; and conventional vulcanization by heat conduction through a heating medium. A layer of heat-resistant synthetic resin which has a melting point higher than the vulcanizing temperature is provided over the outer periphery of a rubber hose in a uniform thickness. This layer is in close contact with the hose but not adherent thereto. After the resin layer is cooled and hardened, the rubber hose is heated and cured in a microwave vulcanizing tank before being subjected to vulcanization by heat conduction through a heating medium in an ordinary vulcanizing tank. After completion of vulcanization, the layer of synthetic resin is peeled off and removed.

Abstract: The present invention relates to a method of manufacturing a release paper characterized in that a mixture of polyolefin and a silicone release agent compatible therewith comprising a reaction product of polymethyl hydrogen siloxane, vinyl group-containing poly-dimethyl siloxane and at least one of olefins or polyolefins having one or more double-bonds is extruded onto a substrate of paper, fabric, film etc., the laminate is heat treated for the release agent contained in the mixed layer of the above-mentioned laminate to bleed onto the surface of the mixed layer to be thus localized and the localized release agent is fixed by curing.The release agent's compatibility with the polyolefin, and this film forming and stretching properties are improved, and since the release agent of high concentration is localized and fixed by curing on the surface of the release agent layer, only a small amount of the release agent is needed.

Abstract: Manufacture of vitreous carbon bodies in which thermoplastic materials containing aromatic groups are formed into bodies, are thermally stabilized by irradiation with ionizing radiation and are carbonized by heating them in an inert atmosphere.

Abstract: Method and apparatus for producing sealing strips and similar profiled strips of rubber and rubber-like elastomers. Rubber-like profiled sealing strips for window or door openings are frequently provided with overlay strips to facilitate installation, to enhance the relative movements, or for aesthetic-visual reasons. The material of these overlay strips generally differs considerably from the material of the base main strip. The manufacture of such two-material profiles can be undertaken in a single extrusion step by joining and directly combining a prefabricated overlay strip with the main strip in the extrusion head of an extrusion press, where the shape is provided for the profiled strip. By stretching the overlay strip, the adhesion of the latter to the main strip is significantly improved.

Abstract: Polyimide film prepared from a precursor solutions of polyamic acid in a solvent can be dried during or following the thermal or chemical conversion step, which produces a polyimide, by adding to the solution a small amount of an alkyl ester of phthalic, terephthalic, or isophthalic acid, casting the solution on a flat surface and heating the solution on the flat surface at about 100.degree.-200.degree. C.; then, removing the resulting partially converted film from the flat surface and heating it, under restraint, to about 200.degree.-375.degree. C., to bring about complete conversion and remove virtually all of the solvent. Polyimide films are useful in various applications where high temperature resistance is required, including composites for aerospace applications and for circuit boards for electronic equipment.

Abstract: A process for continuously producing pipe by coating a particulate material with a gas curable resin, compacting the coated particulate material in an annular space, treating the compacted, coated particulate material with a curing gas to form a pipe having a porous wall structure, impregnating the porous walls of the pipe with an asphalt or resinous material, and, optionally, winding a reinforcing filament binder around the pipe.

Abstract: A method of forming simulated marble articles from materials polymerizable within a cell or mould characterized in that the mould is filled under conditions in which the polymerizable materials are introduced as streams following the flow path into the cell or mould and the contents are polymerized with the cell or mould disposed so that the flow lines are on a height gradient relative to each other. Limited intermixing of the compositions during the initial stages of the curing process produce an attractive simulated marble effect. The mould may be filled so that the flow lines are disposed in a near vertical position and then rotated so that they are in a near horizontal position with adjacent flow lines on a near vertical height gradient.

Abstract: The instant invention provides a method for making a cast epoxy resin body and the epoxy formulation therefor wherein the formulation includes a two part system. Component A of the system when mixed with Component B in a ratio of 10 to 40 parts of Component B to 100 parts of Component A undergoes a polymerization reaction to form the solid body. Component A consists essentially of from 40 to 70% by weight epoxy novolac polymer, from 30 to 50% by weight vinyl 3-cyclohexene diepoxide and from 0 to 20% by weight 3,4 epoxy cyclohexylmethyl-3,4-epoxy cyclohexane carboxylate. Component B of the system is a paste anhydride consisting essentially of a mixture of a partially hydrolyzed aryl tetracarboxylic acid dianhydride and an alicylic dicarboxylic anhydride.

Abstract: The disclosure is directed to an improved method of determining a configuration or form of a piston employed for an internal combustion engine, based on investigations into and finding of a novel composite material which imparts a sufficiently high degree of smoothness to the surface of an abraded covering layer for a piston and can quickly provide a desired piston profile even for a small-sized gasoline engine, etc.

Abstract: A method of forming a friction pad utilizing two distinct compounds. One of the compounds has a high fiber content and the other has a high flow characteristic. The compounds are placed in respective layers in a mold and are compressed to form a composite piece which is placed in a second mold cavity along with a perforated metal plate. Heat and pressure are then applied to the composite piece in the second mold cavity to cause the high flow characteristic compound to flow and enclose the metal plate such that the two compounds and the metal plate are firmly bonded into an integral friction pad.

Abstract: A continuous molding method is disclosed as providing a sliding seal chamber in which moving molding surfaces form and can provide means for the induction of such temperature changes required to produce finished products from the chosen raw material.

Abstract: A synthetic resin plate having at least two different colors is prepared by a process having the steps of supplying at least two polymerizable liquid materials differing in the color from at least two inlets, passing them through at least two groups of flow paths alternately arranged, extruding and injecting the polymerizable liquid materials into a polymerization apparatus, polymerizing the liquid materials, and withdrawing a plate-shaped product having a striped pattern extending from the surface to the interior or a plate-shaped product having said striped pattern in which the boundary area between the adjacent stripe lines of different colors is gradated.

Abstract: A composition of material for use as a friction material in a brake and its method of manufacture. Liquid double salts of dibasic and monobasic (ammonium-potassium hydrogen) phosphoric acid (DSP) is added to a dry mixture of reinforcing fiber, friction modifiers, fillers and phenolic resin to create a high viscosity slurry. Thereafter, a metallic (magnesium) oxide and para formaldehyde (para) are added to the slurry. Molds which have been previously heated are filled with the slurry and any excess removed. The metallic oxide reacts with the DSP and the para reacts with the phenolic resin to create a two binder matrix for holding the reinforcing fiber, friction material and fillers in a fixed relationship corresponding to the shape of a brake pad. The brake pads are removed from the molds and transported to a ventilated chamber where the internal curing proceeds at or near ambient temperature to complete the manufacture of the brake pad.

Abstract: An improved hydrostatically compressed elastomeric spring in which an inner metal core buried in the elastomer contained in a flattened and bent tube constitutes a heating resistor for the elastomer to control its expansion and the compression of the spring under the effects of a static load. The spring is useful in shock absorbing devices.

Abstract: A process and apparatus for the vulcanization of the insulation of an electric cable in which the cable core with the insulation thereon are passed through a tube filled with a liquid having a specific weight substantially equal to the specific weight of the insulation. The section of the tube nearer the entrance end is supplied with degassed liquid at vulcanizing temperature and the following section is supplied with degassed liquid at a temperature for cooling the insulation, and because the liquid has different viscosities at the two temperatures, a liquid interface is produced between the two portions which interface is maintained during the vulcanizing of the insulation. During the vulcanizing of the insulation, a portion of the liquid in at least one section is removed and treated to remove vulcanization products.

Abstract: An electron beam curable magnet wire enamel comprises the reaction product of a polyester prepolymer having terminal functional groups reactive with an isocyanate, and a urethane-acrylate prepolymer formed by reacting a diisocyanate and a hydroxyalkylacrylate. The resulting polymer is extrudable at 100% solids onto a magnet wire substrate and electron beam curable.

Abstract: A process for producing a clutch facing which comprises the steps of: impregnating inorganic fibers with a thermosetting resin; causing rubber composition sheets to adhere to the resin-impregnated inorganic fibers, said sheets having been obtained by causing organic fibers to add to a rubber composition as a processing aid and forming the resulting material into sheets; forming a preform therefrom; and molding the preform under heat and pressure.

Abstract: An aromatic condensation polyimide film that is approximately 90% transparent at 500 nm, useful for thermal protective coatings and the like and the process for preparing same are disclosed. An essential feature of the invention for achieving maximum optical transparency films requires utilizing recrystallized and/or sublimated specific aromatic diamines and dianhydride monomers and introducing bulky electron-withdrawing groups and separator groups into the polymer molecular structure. The incorporation of bulky electron-withdrawing groups in the diamine portion of the polymer structure serves to reduce the formation of inter-chain and intra-chain charge transfer complexes which normally cause large absorptions in the UV-visible range. Incorporation of separator atoms into either the diamine or dianhydride monomers serves to reduce the amount of conjugation and inter-and intra-chain electronic interactions and thereby lessen charge transfer complex formation.

Abstract: Disclosed in accordance with the invention is a method for fiberboard manufacture comprising the steps of steaming and grinding woodchips to obtain a wood pulp, using said wood pulp to prepare a slurry of wood pulp in water, mixing said slurry with a binder, a cure catalyst for the binder, a water-repellent additive, peat, and carbamide to obtain a mixture, casting said mixture and dewatering said mixture to obtain a mat, and compacting said mat to obtain fiberboard which is subjected to heat treatment, in which method the peat used has a moisture content of between 25 and 70 percent and the peat content in said mixture is between 2.5 and 50 percent by mass, with the ratio of absolutely dry peat to said binder equal to between 1.0-7:1.0, respectively, while the carbamide content in said mixture is between 0.2 and 2.0 percent by mass, with the ratio of said carbamide to said binder equal to between 0.02-1:1, respectively.

Abstract: An aromatic condensation polyimide film that is approximately 90% transparent at 500 nm, useful for thermal protective coatings and the like, and the processes for preparing same by thermal and chemical conversion are disclosed. An essential feature of the invention for achieving maximum optical transparency films requires utilizing recrystallized and/or sublimated specific aromatic diamines and dianhydride monomers and introducing phenoxy or thiophenyl separator groups and isomeric m,m'- or o,p'-oriented diamines into the polymer molecular structure. The incorporation of these groups in the polymer structure serves to separate the chromaphoric centers and reduce the formation of inter-chain and intra-chain charge transfer complexes which normally cause absorptions in the UV-visible range.

Abstract: A method for the manufacture of a cross-linked extruded elongated product from polyethylene or other suitable polymer. The polymer is fed into the hopper of a screw extrusion machine. The polymer is heated and melted while being conveyed through the barrel of the screw extruder. A liquid silane compound which comprises a modified vinyl functional silane, a free-radical generator, and a condensation catalyst is carefully metered and injected into the melted polymer. The melted polymer and the liquid silane compound are then mixed and blended to obtain a uniform blended mixture thereof. The blended mixture is then extruded through an extrusion die to form an elongated product of a required final shape and the elongated product is then subjected to the action of moisture and heat until the polymer in the elongated product is cross-linked.

Abstract: A process and apparatus for producing a homogeneous and highly transparent sheet or film from a mixture of a plurality of components which comprises mixing the combined reaction components and depositing the reaction mixture on a molding substrate where the reaction is carried out in a layer thereon, wherein the combined reaction components are mixed, first, in a static mixer and, immediately thereafter, in a dynamic mixer.The invention can be advantageously applied to the manufacture of polyurethane sheets which can be employed in laminated glass sheets.

Abstract: The invention relates to a method for impregnating and embedding electrical windings, especially coils of transformers, by means of an impregnating or casting resin based upon polyepoxide-polyisocyanate mixtures in the presence of a reaction accelerator latent at the processing conditions, which employs conditions that prevent the formation of gas and shrinkage voids in the cast in winding. To this end, the resin including, if applicable, additives, is dried at reduced pressure and while stirring at temperatures of up to 110.degree. C. and the winding is cast-in with the dried resin at reduced pressure and at temperature of up to 110.degree. C.; then the reduced pressure is removed and the winding is exposed to overpressure. Subsequently, generating by an elevated temperature in the electrical winding by Joule heat in the conductor, the cross-linking reaction of the resin is started and is controlled as a function of the reaction heat, until the winding is removed from the mold and post-hardened.

Abstract: A machine for manufacturing foam building blocks (39) and the like wherein a plurality of two-piece forming molds (21) are continuously moved by a conveyor mechanism along a closed path-of-travel (22) is disclosed. Filling, curing and injection stations (31, 32 and 33) are located along the path-of-travel (22). As a mold (21) enters the filling station (31), the nozzle (37) of a foam gun (35) enters a hole (34) in the top of the mold (21) and moves with the mold (21) as that mold continues to move along the path-of-travel (22). At the end of the filling station (31), after the foam gun (35) has injected a suitable amount of resin, curing and foaming agent materials into the mold (21), the nozzle (37) rises from the hole (34). Thereafter, a cap-latch (36) is moved into a hole closed position. In addition to closing the hole (34), the cap-latch (36) forms one of two latches that latch the two mold pieces (21a and 21b) together. The other latch (38) is located on the opposite side of the forming molds (21).

Abstract: A curing mold for curing glass fiber pipe insulation contains alternating positive and negative pressure zones and hot curing gases are introduced to the glass fibers during advancement through the positive pressure zones, and the curing gases are exhausted from elongated exhaust openings in the mold during advancement through the negative pressure zones, and the exhaust openings are cleaned without interrupting the advancement of the glass fibers through the curing mold.

Abstract: Apparatus for treatment of elastomers and polymers has an inner tube of rectangular section in an outer tubular shell. A treatment medium, for example, a liquid mixture of eutectic salts, is circulated by a pump from a reservoir to a manifold and then to the tube to fill the tube apart from its ends. The medium issues from the ends of the tube into the shell from which it drains to the reservoir. Conveyors are arranged to feed an elongate article through the tube. A hot, gaseous wipe is provided by a device. The interior of the shell is filled with gas under pressure through an inlet. A pressurized water cooling system is included.

Abstract: Crystalline polymers having a relatively high melt index and low structured carbon black together produce positive temperature coefficient material which can attain suitable volume resistivity with a greatly reduced annealing time. Temperature self-regulating resistive heating elements may be made with the material in a continuous process where annealing is conducted in a heated zone while the extruded element is in motion or during a short interval when its motion is interrupted.

Abstract: A handgrip, such as a golf club grip, having improved non-slip features is shown which is formed from a silicone rubber composition. The silicone rubber composition comprises an organopolysiloxane gum, a silica filler material, as organosilicone processing aid, a texturizing material, and a quantity of hollow spheres. The texturizing material and spheres are first blended into the composition while heating the composition. The rubber composition is then placed in a suitable mold and cured with a peroxide catalyst to form the handgrip. The external surface of the cured handgrip is buffed to fracture the hollow spheres nearest the surface and improve the non-slip character of the handgrip.

Abstract: A method of forming a spark plug boot which utilizes an extrusion process. An elastomeric tube is extruded, then heated to a partially cured condition. The tube is then cut into individual pieces. The individual pieces are stretched over a pin which has at least one external shoulder. The pin and tube are then heated to a temperature and for a time to provide a final cure. The tube is stripped from the pin. The compression set and shrinkage results in an internal shoulder in the tube, allowing it to serve as a spark plug boot.

Abstract: An elastomeric spring is formed by extruding a rubbery material into a reinforcing sleeve in a mold during relative motion between the mold and nozzle, and thereafter vulcanizing.

Abstract: A method for making curved hose using a curved mandrel by applying a melted material to an inside surface of an uncured hose and solidifying the material. The material is remeltable and forms a lubricant when the hose is pushed onto and removed from a hot curved mandrel.

Abstract: Elastomers are plasticized with a polymerizable monomer, in homogeneous admixture therewith, by adding the monomer to a latex of the elastomer, free of polymerization initiator, followed by coagulation of the monomer and polymer solids. The coagulated solids recovered from the latex may be compounded with a polymerization initiator for the monomer and a vulcanizing agent for the polymer and, optionally, an inorganic filler, and shaped into the desired product form. Polymerization of the polymer and vulcanization of the elastomeric polymer are initiated after shaping.

Abstract: A polyester having a melt anisotropy, which consists essentially of structural units represented by the following formulae is described. ##STR1## wherein X is hydrogen, chlorine, methyl, ethyl, propyl, butyl, methoxy, ethoxy, nitro or cyano, Ar is selected from 1,4-phenylene, chloro-1,4-phenylene, methyl-1,4-phenylene, 4,4'-biphenylene, 3,5,3',5'-tetramethyl-4,4'-biphenylene, 1,4-naphthalene, 1,5-naphthalene, 2,6-naphthalene, dimethyl-1,4-phenylene, trimethyl-1,4-phenylene and oxy-4,4'-diphenylene, and k, l, m and n represent molar fractions of the corresponding units and they satisfy the following requirements: ##EQU1## andk+l.apprxeq.m (3)The polyester is shaped into articles such as fiber and film. The shaped article is prepared by melt shaping the polyester to form a shaped article and then heating the shaped article at a temperature in the range of from a temperature lower by 50.degree. C. than the softening point to the softening point.

Abstract: In a method of producing an extruded, cross-linked cable coating of filled polyethylene wherein the extruder is charged with commingled polyethylene pellets and filler-EPR masterbatch pellets containing a peroxide cross-linking agent, the peroxide is incorporated in the masterbatch pellets by application to and absorption in the pellets during advance of the pellets to the extruder, while the pellets are continuously maintained at an elevated temperature for preventing bleed-out of absorbed peroxide.

Abstract: The invention provides a method for the preparation of a cured silicone rubber body by curing at room temperature and yet free from the problems of the low shape-retainability before curing of the conventional room temperature-vulcanizable silicone rubber compositions and the relatively poor mechanical strengths of the cured bodies thereof due to the use of relatively low molecular weight components therein. The method comprises shaping an organopolysiloxane composition comprising an organopolysiloxane of a sufficiently high molecular weight having at least two aliphatically unsaturated hydrocarbon groups, e.g. vinyl groups, per molecule and a platinum catalyst into a desired form and contacting the shaped form with an organohydrogenpolysiloxane in a liquid form so that the latter siloxane diffuses through the shaped body and pertains to the crosslinking reaction with the unsaturated groups in the former siloxane as catalyzed by the platinum catalyst to give a cured silicone rubber body.

Abstract: A process is disclosed for the manufacture of products from silicone rubber stock which includes forming a mixture of silicone rubber components, such as silicone monomers, oligomers, or polymers, microcapsules containing a cross-linking agent for silicone rubber components and, optionally, one or more additives. The cross-linking agent is maintained in microcapsules isolated from the silicone rubber components until a predetermined temperature and pressure are reached. The mixture is flowed into a mold cavity under heat and pressure prior to any significant cross-linking agent-induced cross-linking during a first portion of the molding cycle. During a second portion of the molding cycle, the cross-linking agent is released to effect substantially all cross-linking agent-induced cross-linking. The cured mixture is removed from the mold cavity to provide a silicone rubber product.

Abstract: A process for the manufacture of glass fiber-reinforced polyester products is disclosed. A ready-to-mold resin and reinforcement composite is prepared using an initiator which has been microencapsulated in order to prevent initiator-induced cross-linking of the resin reactants. The initiator is released during the molding of the composite by rupture of the microcapsules due to internal vapor pressure developed at a preselected molding temperature. The encapsulation of the initiator provides improved homogeneity and increased flowability of the composites during molding, and enables the provision of molded polyester products having higher degrees of cure and more defect-free finish surfaces.

Abstract: A composite which has a high flexural strength to density ratio and which is resistant to strength loss incident to exposure to water, is formed by reinforcing unsaturated thermosetting resin with glass fibers sized with selected maleic anhydride adduct of polybutadiene utilized in critical amounts.

Abstract: A blanket formed of heat and flame resistant materials and adapted to be placed adjacent to a structural part to isolate it thermally from other, adjacent structural parts. The blanket is comprised of a layer of insulation material coupled to a layer of fibrous material impregnated with a thermosetting resin. When the blanket is in a desired shape, the resin is cured to render the layer of fibrous material substantially rigid so it can support itself as well as the layer of insulating material coupled to it. Layers of a heat and fire resistant fabric such as glass fabric are placed on opposed sides of the layer of insulating material to keep the insulating material intact. In one application, the blanket is molded in the form of a box-like structure which can at least partially surround a structural part, such as an aircraft engine, to form a fireshield to isolate the engine from adjacent structural parts of an aircraft.

Abstract: A method of producing accurately sized sintered material of ultra high molecular weight polyethylene including the steps of mixing an organic peroxide and a lubricant with an ultra high molecular weight polyethylene powder having more than 1,000,000 of mean molecular weight by a viscosity method and more than 3,000,000 by a light scattering method, and forming a ram extrusion of the mixture. The transverse dimensional accuracy, or displacement, i.e. the difference between the maximum surface diameter and the minimum surface diameter at longitudinally spaced positions of the extruded product, is extremely small, thereby providing highly accurate size, roundness, etc. Further, a product is formed by the method having uniform electroconductivity.

Abstract: A method of polymerizing a thermosetting resin such as an epoxy resin charged with silver particles in which shaped bodies of the resin are brought cold into contact with vapor of an organic liquid boiling at a temperature of above 100.degree. C. so that a condensate from this liquid forms on the bodies in temperature equilibrium so that the heat of vaporization is transferred upon such condensation rapidly to the bodies and the latter are polymerized rapidly under the constant temperature and pressure conditions.