Abstract: A polymeric pipe lining composition consisting of 100 parts by weight of polyvinyl chloride, 0.5 to 3.5 parts of stabilizer, 5 to 30 parts of plasticizer, 0.4 to 2.0 parts of internal lubricant or wax, and 0.4 to 2.0 parts of external lubricant or wax. The composition is especially useful for in situ lining of sewers.

Abstract: A hose including at least an inner tube, a reinforcing layer and an outer cover, wherein the inner tube and the outer cover are individually composed of a thermoplastic elastomer comprising a vulcanized rubber dispersed in a thermoplastic resin, M.sub.p defined by the following formula (I) is not greater than 70 kgf/cm.sup.2, and flexural rigidity of the hose at a bending radius four times the outer diameter of the hose is 1 kgf or less: ##EQU1## wherein t.sub.1 and t.sub.2 are the thickness of the inner tube and the outer tube (mm), respectively, and M.sub.1 and M.sub.2 are stress (kgf/cm.sup.2) at 25% elongation of the inner tube and the outer cover, respectively.

Abstract: A plastic pipe having improved resistance to methanol-containing fuels and improved mechanical properties is provided. This is achieved by a multilayer plastic pipe consisting of at least one outer layer based on polyamide and at least one layer of a linear, crystalline polyester modified with isocyanates. With the aid of the invention it is possible to obtain plastic pipes having improved barrier properties against methanol-containing fuels and dimensional stability and mechanical load-bearing capacity.

Abstract: Porous pipe formed of particles of vulcanized rubber dispersed in a binder resin such as polyethylene are stabilized to reduce degradation by ultraviolet light by dispersing in the binder resin an effective amount of an ultraviolet stabilizer such as 0.1 to 10% by weight of carbon black.

Abstract: Iron pipe and other hollow articles are lined with a cementitious mortar containing a quantity of polymer particles and the pipe is rotated about its axis so as to stratify the mortar and develop a polymer rich inner surface that is subsequently cured, dried and heated to the polymer fusion temperature and then coated with a continuous layer of pure polymer.

Abstract: A centrifugally cast plastic pipe comprised of a polymer derived from monomers polymerized in bulk is provided. A pressurized cylindrical mold provides smooth inner and outer surfaces. Pipes with a wall thickness of from 1/8 inch to 3 inches and an outer diameter of 1 inch to 12 feet are provided.

Abstract: An articulated pipe used for an endoscope includes articular chips made of brittle material such as a ceramic, with joint pins for joining the articular chips in series. The joint pins are made of shape-memory material. With these joint pins, the brittle articular chips are easily joined together without being damaged.

Abstract: In a pipe coated with a resin layer on the inner surface thereof and a method for manufacturing the same, resin mixture including thermal melting fluoro resin and fluorine elastomer is applied to the inner surface of a pipe member. The resin mixture is thermally treated on the inner surface of the pipe member to be of a mesh like pattern so that a resin layer of a predetermined stripping strength is obtained thereon.

Abstract: A waterproofing agent for an optical or electric cable, formed of a cross-linked macromolecular compound containing a sulfonic acid group or a salt thereof in an amount of not less than 0.5 mg. equivalent/g and a dissociating group in an amount of not less than 1.0 mg. equivalent/g, and a method for waterproofing said cable by packing said waterproofing agent in the sheath of said cables.

Abstract: A contrast medium-containing tube is provided which is a thermoplastic resin tube incorporated with a white bismuth compound composed mainly of bismuth oxide containing 70-85 wt % bismuth and having a particle diameter substantially smaller than 20 .mu.m. This contrast medium-containing tube looks white and remains white in appearance over a long period of time. It is easy to carry out extrusion molding for producing this contrast medium-containing tube.

Abstract: A polyvinyl choride resin pipe serves as an inner lining material for the existing pipes. The resin pipe is formed of a resin composition which comprises as a main component either a polyvinyl chloride having a degree of polymerization DP of 600 to 1,050, or a mixture of 40 to 60% by weight of a polyvinyl chloride having a lower average degree of polymerization DP.sub.L of 400 to 600 and 60 to 40% by weight of another polyvinyl chloride having a higher average degree of polymerization DP.sub.H of 1,050 to 1,350. The resin composition further comprises 3 to 25 parts by weight of a modifying agent blended with 100 parts by weight of the main component. The modifying agent is composed of MMA- and/or MBS-modifiers.

Abstract: Novel synthetic elastomer and/or natural rubber-based adhesive liquid coatings adapted for use as a primer coating for pipelines, which coatings include an amphipathic metal complexing reagent in an amount effective to provide protection against cathodic disbondment; and novel protective pipewrap systems including same.

Abstract: A refrigerant transporting hose including a polyamide resin innermost layer, at least one intermediate rubber layer positioned radially outwardly of the innermost layer, a reinforcing fiber layer positioned radially outwardly of the intermediate rubber layer or layers, an outer tube which is positioned radially outwardly of the fiber layer and has at least one layer including an outermost layer, and at least one phenolic resin layer formed of a phenolic resin and having a total thickness within a range of 5-100 .mu.m. Each phenolic resin layer is provided at a corresponding one of interfaces between adjacent layers which are selected from the innermost layer, the intermediate layer or layers, the fiber layer and the layer or layers of the outer tube.

Abstract: Composite tube, which is a sandwich structure, comprising a plurality of fiber strata, each made of epoxy-saturated fibers, and at least one layer of a honeycomb material sandwiched between. The fiber strata and the honeycomb layers are in alternating sequence. Each fiber stratum may include a fiber web surrounded by a fiber cable, which consists essentially of a large number of twisted fibers arranged in the axial direction and parallel to each other. The composite tube of this invention is very light in weight, yet has tensile strength and other mechanical properties corresponding to those of conventional tubes made of steel. The tube of this invention is especially useful as a guide roller or an expansion shaft.

Abstract: A layered tubing for use in a motor vehicle has five layers, namely a thick tubular outer layer formed of a Nylon 11 or Nylon 12, a thick tubular intermediate layer of Nylon 6, a thin tubular intermediate bonding layer between and bonded to the thick outer and intermediate layers and formed of polyethylene or polypropylene, a thin tubular intermediate solvent-blocking layer inside the thick layers and formed of a copolymer of ethylene and vinylalcohol, and an inner layer of Nylon 6 inside the blocking layer. The thick outer and intermediate layers each have a thickness of between 0.2 mm and 0.7 mm. The thin intermediate blocking layer comprises by weight 30% to 45% polyethylene and the intermediate blocking layer has a thickness of between 0.1 mm and 0.2 mm. The inner layer has a thickness of at most 0.1 to 0.5 mm and the bonding layer has active side chains of maleic acid anhydride and a thickness of between 0.05 mm and 0.2 mm.

Abstract: A reinforced hose including an inner pipe layer, an intermediate reinforcing layer and an outer pipe layer, each of the inner and outer pipe layers being made of synthetic rubber having a polarity at least at the surface thereof which contacts the intermediate reinforcing layer. The intermediate reinforcing layer is coated with nitrile rubber or a blended material of nitrile rubber and a high-molecular material.

Abstract: A rubber hose having an outer tube formed of a rubber material, and an inner tube located radially inwardly of the outer tube, the inner tube including an inner layer formed of a first composition containing a fluoro rubber as a major constituent thereof, and an outer layer located radially outwardly of the inner layer, the outer layer of the inner tube being formed of a second composition containing as a major constituent thereof a blend of chlorosulphonated polyethylene and polyvinyl chloride.

Abstract: A method of lining a pipe comprises the steps of laying hose means along the bottom of a pipe to be lined, the hose means having been filled with a predetermined quantity of settable lining composition, anchoring the hose means at each end along the bottom of the pipe, advancing a centrifugal lining machine along the length of the hose means, slitting the hose means in front of the advancing centrifugal lining machine to permit egress of the lining composition from the hose means, and delivering the admixed settable composition to a centrifugal impellor of the centrifugal lining machine for application of the settable composition to the pipe wall as the centrifugal lining machine advances along the pipe. The method is characterised by the step of guiding the slit and emptied hose means through an axial bore in the centrifugal lining machine to lie in a flattened condition on the bottom of the lined pipe wall rearwardly of the centrifugal lining machine.

Abstract: An extruded thermoplastic polymer conduit having a conduit wall of substantially uniform crystalline morphology through the entire thickness thereof free of any oriented surface zone and the process of making such conduits.

Abstract: In rubber hoses for conveying fuels, the inner tube rubber layer coming into contact with fuels generally comprises two sublayers, namely the inside fluororubber layer coming into direct contact with fuels and the outside layer of an NBR and the like. The fluororubber layer is undesirably subject to degradation due to amine type additives contained in fuels and is poor in adhesion to the outside layer. In accordance with the invention, the contents of vinylidene fluoride, one of the fluororubber constituents, is reduced to 10-50 mole percent and at the same time a monomer capable of causing crosslinking of the fluororubber in the presence of a peroxide is newly added as a component of the fluororubber composition in a specified amount. The results are prevention of the degradation due to amine type additives and improved adhesion to the outside layer.

Abstract: A hose for refrigerant fluid or fuel oil service which comprises a core tube, a reinforcing layer and an outer cover, the core tube being of a composite structure having an inner plastic peripheral wall, an intermediate plastic peripheral wall and an outer rubbery peripheral wall. The inner and intermediate walls are formed of a selected class of polyamides and polyolefins, whereby the hose is rendered highly impermeable to fluid and moisture, greatly resistant to stress cracking and sufficiently flexible.

Abstract: A hose for transporting or otherwise handling refrigerants is disclosed which comprises an inner tube, an outer cover and a reinforcing layer disposed therebetween, the inner tube including a resinous inner wall and a rubbery outer peripheral wall. The inner peripheral wall is formed by a selected class of polymers having specified compositions, whereby the hose is rendered highly resistant to gas permeation and stress cracking and highly flexible and moisture-proofing.

Abstract: High performance hose is disclosed which is characterized by enhanced heat resistance, leading to prolonged service life, and hence are suitable for use in automobile power steering units. The inner tube has a double-layered construction composed of an inner layer of hydrogenated acrylonitrile/butadiene copolymer rubber and an outer layer of rubber composition which comprises specified amounts of a selected class of sulfurs, organic peroxide and triazine compounds combined with selected sulfur-curable base rubbers.

Abstract: A recording implement comprises at least an ink storing member and an ink feeding member, wherein a part or all of the site of said recording implement which is in contact with ink is formed of a polyolefin as the main component obtained by addition of an inorganic metal salt as the neutralizing agent for the catalyst during polymerization.

Abstract: A reinforced composite tubular body comprises a metallic reinforcement of helical convolutions completely embedded in a tubular body of thermosetting polymer which has a coefficient of elongation at rupture less than 15%. The reinforcement comprises at least one metallic reinforcing strip wound helically around the longitudinal axis of the tubular body so as to form a plurality of successive helical convolutions completely embedded in the wall thickness of the tubular body and separated from one another by the polymeric material. The extent of overlap of adjacent helical convolutions is at least equal to e.multidot..sigma..sub.r /2.tau. where e designates the thickness of the strip, .sigma..sub.r the ultimate breaking strength of the strip and .tau. the shear strength of the metallic strip/polymeric material interface.

Abstract: This invention is concerned with a hose construction particularly suitable for Freon service in refrigeration systems. The hose comprises (1) a core tube of polyamide covered by an elastomeric friction layer such as EPDM rubber having incorporated therein a calcium ion source and an adhesion system and a curative, (2) a layer of tensioned reinforcement strands, (3) an adhesive/barrier/friction layer such as an ethylene acrylic acid copolymer, (4) a second layer of tensioned reinforcement strands, and (5) a cover selected from chlorobutyl rubber or other suitable materials wherein the chlorobutyl rubber utilizes a bis-dienophile as a crosslinker.

Abstract: A mixture of virgin crumb rubber sized to between 30 mesh and 100 mesh containing less than 5%+100 fines and thermoplastic binder, such as carbon black filled polyethylene containing a coating promoter, such as a citrate salt and lubricant, such as a calcium stearate, is mixed in a vented Banburg mixer heated to at least 350.degree. F. to remove volatiles through vent before extrusion. The mixture is formed into sheet in the nip of a two roll assembly and cooled in air before diced into pellets by a dicer.The pellets are formed into porous pipe by extrusion in a pipe extruder having the feeding, transition and metering zones separately heated to temperatures from 320.degree. F. to 400.degree. F. (T.sub.1, T.sub.2, T.sub.3). The die has a separate jacket receiving heat exchange fluid for heating the die to a temperature from 290.degree. F. to 380.degree. F. to form a porous pipe having more uniformly spaced and sized pores and a smoother inner wall surface.

Abstract: Polyamide plastic fuel lines which are dimensionally stable and resistant to fuels, alcoholic fuels and alcohols as fuels are prepared from aliphatic high molecular weight polyamides. The fuel lines are prepared by extruding a hot melt of the polyamide, sizing through a die having a diameter in excess of the given diameter of the fuel line, cooling the fuel line in a cooling bath, removing the fuel line from the bath and sizing the fuel line adiabatically through a disk having a diameter less than the given diameter.

Abstract: Structures, such as pressure vessels or pipes, for the storage and transportation of fluids under pressure are wrapped with a composite material including a high-strength unidirectional filament material in a matrix of a flexibilized isophthalic polyester resin which has an elongation at least equal to the elongation of the material of the structure. The index of refraction of the resin is matched to the index of refraction of the filament material so that the pressure vessel is visible through the wrapping. The resin discolors when exposed to a heat above which the material of the structure weakens, thus acting as an indicator that the structure is unsuitable for use.

Abstract: A soft vinyl chloride resin-silicone composite shaped article consisting of a soft vinyl chloride resin shaped article and a cured layer of an addition polymerization type silicone composition adhered to the surface of the vinyl chloride resin shaped article, wherein said addition polymerization type silicone composition contains an organohydrogenpolysiloxane having at least two hydrogen atoms directly bonding with silicon atoms in each molecule, in an amount enough to provide one to six such hydrogen atoms per one vinyl group of the silicone composition. The above composite shaped article has a very high bonding strength between the vinyl chloride resin shaped article and the cured layer of an addition polymerization type silicone composition.

Abstract: A conduit tube of an electrode device for electrically heating underground hydrocarbon resources, which comprises: a metal conduit tube and an electrically insulative covering adhered on and around the outer peripheral surface of said metal conduit tube, said electrically insulative covering being formed by adhering polyether/ether/ketone resin in powder form having particle size of a range of from 10 to 100 .mu.m on and around said metal conduit tube which has been preheated to a temperature range of from 350.degree. C. to 450.degree. C. by the electrostatic coating method, and fusion-bonding the electrically insulative covering material thereon at said temperature range of the preheating.

Abstract: A process for coating metallic substrates in several stages with heat-hardenable synthetic resins having functional groups from the group comprising hydroxyl-containing polyesters, crosslinkable acrylate resins and epoxy resins, thermally stabilized ethylene copolymers and, if appropriate, polyolefins, in which, in the first stage, a powder mixture of these components is applied to a metallic substrate at a preheating temperature which is above the melting point of the (A) resins and which is adequate for their crosslinking, and, in the second stage, an olefin polymer layer is applied to the hot, coated substrate. The metallic substrates are pipes, large moldings, vessels and building elements, the coated pipes being advantageously used as pipelines for petroleum and natural gas.

Abstract: A connector member (11) is disclosed for sealed connection with a second connector member (30), to permit sealed flow of material through the joined connector members. The connector member (11) is made of a material selected from the group consisting of aliphatic hydrocarbon resins, aliphatic polyester resins, copolymers of olefins and vinyl acetate, and olefin-acrylate copolymers. The material also contains an effective amount of an antioxidant agent being selected to provide to the material the characteristic of permitting transmission of at least 15 percent of at least one wavelength of ultraviolet radiation having a wavelength between 220 and 300 nanometers through a thickness of 0.003 inch of the material.

Abstract: Disclosed is a welded side-seamed can formed by welding a can blank comprising a steel plate substrate having, formed thereon, a coating layer consisting of a metallic chromium layer and a chromium oxide layer formed on the metallic chromium layer, wherein the so-formed side seam has an exposed steel plate layer consisting of a compact and dense steel oxide formed mainly of magnetite, which has a thickness of 50 to 800 A, especially 50 to 400 A, and a coating of a resin or resinous composition consisting of carbonyl, hydroxyl, ether and epoxy groups at a concentration of 10 to 2000 millimoles per 100 g of the resin is formed on at least one surface portion of said side seam through said steel oxide layer.

Abstract: This is an improved blast joint for subterranean wells which is ideally suited for applications where corrosive compounds such as hydrogen sulfide and carbon dioxide are encountered. The blast joint comprises a plurality of temperature and corrosion resistant hard rings which are in a stacked end face-to-face array, coaxially carried on a length of tubing. The rings are resiliently compressed in the array by spring washers interspaced by flat washers and this assembly is retained by end collars distally carried on the tubing. The end collars which are employed in this invention have a collet type construction; each collar comprising a clamp ring slidably received over the end of the production tubing, having an internally threaded outer end and a tapered inside wall. A collet sleeve with a tapered outside wall is received in the clamp ring.

Abstract: A fiber reinforced epoxy resin article in which a Lewis base is employed as the catalyst for the addition reaction of a phenolic or alcoholic hydroxyl group and the oxirane group of the epoxy resin. The resin system has improved flexibility and pot life and the cured article has improved chemical resistance.

Abstract: A fiber reinforced plastic pipe is provided with an integral flange, comprising circumferentially extending glass fiber fabrics. As the width of the fabrics exceeds the width of the finished flange, the fabrics are provided with inwardly bent parts at one or both side walls of the flange, or with undulating parts.

Abstract: A hose resistant to deformation is described which includes the usual polymeric tube and outer cover, and at least one annular reinforcement layer of fiber bundles sandwiched between the tube and cover. A polymeric aqueous-insoluble continuous film impregnates the fiber bundles and binds the reinforcement to at least one of the cover and tube, the continuous polymeric film serving to unexpectedly stiffen the hose appreciably. A method for producing the hose is described wherein the adhesive film is formed by applying a latex dispersion to the hose tube and/or reinforcement.

Abstract: Flexible coextruded tubing having an outer portion (14) of polyvinyl chloride plastic containing a minor amount of intimately mixed silicone oil and having an inner portion (12) of plastic free of silicone oil.

Abstract: A polyester resin composition is disclosed. The composition consists essentially of a blend of a diethylene glycol:neopentyl glycol:maleic:isophthalic acid polyester and a propylene glycol:isophthalic acid:maleic polyester, together with a copolymerizable monomer in an amount sufficient for reaction with the polyester blend to produce a thermoset article. In a preferred disclosed composition, the blend is composed from about 5 to 15 percent by weight of the diethylene glycol polyester and from about 95 to 85 percent of the propylene glycol polyester, together with from 35 to 45 percent by weight of styrene as a copolymerizable monomer, based upon the weight of the polyester blend and styrene.

Abstract: The present invention provides a process for treating polyvinyl fluoride surfaces to enhance adhesion of other polymers thereto comprising applying to at least one surface thereof a solution consisting essentially of a coating polymer selected from a polyurethane or an alkyl polymethacrylate and at least one aprotic polar solvent in which said polymer is soluble, and exposing said surface to a temperature of from about 120.degree. C. to 230.degree. C. for a time sufficient to evaporate said solvent. The treated polyvinyl fluoride having an adhering intermediary surface of polyurethane or alkyl polymethacrylate usefully serves as a means to secure the polyvinyl fluoride to another polymer which otherwise would not adhere to polyvinyl.

Abstract: Various pipe wall constructions comprising thermosetting resin, randomly disposed chopped glass fibers, sand, circumferentially extending continuous glass filaments, and axially extending glass fibers in various percentages in structural wall portions thereof, and having various protective inner liner and outer wall portions.

Abstract: There are applied in layers on the surface of a metal pipe, a rapid hardening and cure type corrosion preventive material consisting essentially of isocyanate terminated polyurethane prepolymer, amine base hardener and petroleum resin, and a reinforcing material consisting of silica sand, blast furnace slag or the like. Thus there are provided a plurality of coatings or layers on the metal pipe, which are excellent in impact resisting and corrosion preventive properties.

Abstract: A synthetic resinous tube having a plurality of bonded coaxial layers with at least one layer being thermoplastic and another substantially non-thermoplastic is formed by the simultaneous coaxial extrusion of thermoplastic tubes and electron irradiation of one of the layers of the tube to convert it from a thermoplastic resin.

Abstract: A resinous product has high resistance to flame spread, good heat release and exhibits a low smoke-developed rating when exposed to flame or to indirect or radiant heat, and is flexible, tough and resistant to cracking and embrittlement upon curing. Such a product is the condensation product of resorcinol with or without included phenol, and an admixture of paraformaldehyde and furfural or furfuryl alcohol or both. The resorcinol starting material of this invention can also suitably be used in the form of a B-stage or partially cured resin of resorcinol-phenol-formaldehyde which is then condensed with the aforesaid aldehydes or such aldehyde substance and furfuryl alcohol. The product is useful in making castings or moldings which are resistant to embrittlement or cracking upon curing, and in making tough fiberglass parts, and it can contain fillers or the like. A method of making the product and articles is provided.

Abstract: A tetrafluoroethylene polymer comprising primary particles having core and shell portions, the core portion comprising tetrafluoroethylene polymerized in the presence of a perfluoroalkyl or alkoxy trifluoroethylene comonomer, particularly hexafluoropropylene, and shell portion consisting of tetrafluoroethylene homopolymer, or a copolymer of tetrafluoroethylene in which the comonomer concentration is less than half that in the core portion.

Abstract: A well installation, such as casing, tubing, a line movable in the well, and surface equipment, consists of high strength, light weight, non-metallic material.

Abstract: A method for the preparation of a hydrophilic acrylonitrile-containing polymer comprising admixing a solution of said polymer in 47% to 75%, preferably 50 to 72% concentrated HNO.sub.3, with solid particles of a substance insoluble in said acid solution and soluble in water, aqueous solutions of said substance being operative to precipitate said polymer from said HNO.sub.3, shaping the mixture of the dissolved polymer with said solid substance to a desired physical shape, coagulating said shaped polymer in an aqueous medium and washing said solid particles out from the coagulated polymer, and articles made therefrom.The added solid substance either may react with nitric acid forming a water-soluble nitrate, or it may remain in the mixture unchanged.

Abstract: The invention relates to the fabrication of composite rigid tubular structures which include a rigidified tubular core member, an initially open-cell resilient foam material helically wrapped about the core member, a layer of reinforcing elements helically wrapped about and radially compressing said foam material, and a thermoset resinous matrix filling the compressed open-cells of said foam material and encapsulating said reinforcing elements.

Abstract: A flexible self-retracting coiled tubing having desirable recoil strength and elastic memory is described. The coiled tubing is adaptable especially as a self-retracting air tube for transmitting fluids under pressure to pneumatic equipment. The coiled tubing comprises an extruded seamless plastic tube prepared by extruding a mixture comprising a chemically extended polyester and from about 10% to about 50% of a polybutylene terephthalate polymer.