Abstract: The present invention is directed to a pneumatic tire comprising a carcass and an innerliner in direct contact with the carcass, the innerliner comprising: a film comprising a blend of a polyamide, an ?-olefin graft copolymer, and an ionomer; and an adhesive layer disposed between the film and the carcass, the adhesive layer comprising: a polymeric amine and a resorcinol-formaldehyde-latex (RFL) adhesive.

Abstract: A method for treating an aromatic polyamide filament or yarn to improve its adhesion to rubber wherein, the method comprises exposing the filament or yarn to a first mixture of reagents comprising multi-functional isocyanate oligomers and multi-functional epoxy oligomers, wherein the ratio of total isocyanate groups to total epoxy groups in the mixture is in the range of from 0.8 to 1.2, and heating the exposed filament or yarn to a temperature of at least 100 degrees C. whereby the epoxy and isocyanate oligomers cross-link and form a network on the surface of the filament or yarn.

Abstract: The present invention discloses an improved tool, which comprises a reinforced member; and a resin layer is coated on the reinforced member, wherein the weight of the resin layer per unit area of the reinforced member may be less than 90 g/m2. The weight of the resin layer may be less than 15% of the total weight of the improved tool. The present invention dramatically reduces the production costs while maintaining the application performance unchanged.

Abstract: A method for treating an aromatic polyamide filament or yarn to improve its adhesion to rubber wherein, the method comprises exposing the filament or yarn to a first mixture of reagents comprising multi-functional isocyanate oligomers and multi-functional epoxy oligomers, wherein the ratio of total isocyanate groups to total epoxy groups in the mixture is in the range of from 0.8 to 1.2, and heating the exposed filament or yarn to a temperature of at least 100 degrees C. whereby the epoxy and isocyanate oligomers cross-link and form a network on the surface of the filament or yarn.

Abstract: A rubber-metal composite body constituted of a rubber composition and a metal material embedded therein is conventionally used in a rubber article requiring high strength in order to reinforce rubber to improve strength and durability thereof. The present invention provides a rubber composition having good initial adhesive properties and good heat resistant adhesive properties with respect to a metal material, mainly for use in the rubber-metal composite body as described above. Specifically, the present invention provides a rubber composition, containing a cobalt compound by an amount, according to cobalt atoms, in the range of 0.0025 to 0.05 parts by mass with respect to 100 parts by mass of a rubber component.

Abstract: The present invention relates to a dipping method applied on hybrid cords comprised of aramide and aramide-Nylon 6.6 fibers essentially comprising the steps of preparing the primary dipping solution (11), applying the primary dipping solution onto the cords (12), applying the primary heat treatment (13), preparing the secondary dipping solution (14), applying the secondary dipping solution onto the cords (15), applying the primary heat treatment (16), and used as a reinforcing material inside the rubber.

Abstract: A binder composition comprising a partially pre-oxidized drying oil and at least one co-vulcanizing agent. A method provides rapid curing of the compositions. The materials find utility in flooring, coating, and decorating applications. One preferred utility is in the manufacture of linoleum type flooring. Another preferred utility is in the manufacture of a transparent/translucent coating for improving the wear properties of surfaces.

Abstract: The present invention relates to a pulverulent adhesive for textile reinforcing inserts, which is dispersible in water, for the production of reinforced rubber products. The adhesive thereby comprises an at least partially capped, low-molecular isocyanate, a wetting agent, a binder and also possibly further additives.

Abstract: A method for bonding a material to a first substrate surface that includes providing a catalyst at the first substrate surface and then contacting that surface with a material that undergoes a metathesis reaction to bond the material to the first substrate surface. There are two embodiments of this method—a coating process and an adhesive process. In the coating embodiment, the metathesizable material is contacted with the catalyst on the substrate surface so that it undergoes metathesis polymerization to form the coating. The adhesive process includes (a) providing a catalyst at the first substrate surface, (b) providing a metathesizable material between the first substrate surface and the second substrate surface, and (c) contacting the catalyst on the first substrate surface with the metathesizable material so that the metathesizable material undergoes a metathesis reaction and bonds the first substrate surface to the second substrate surface.

Abstract: A transmission belt is made of a cord, a rubber or thermoplastic matrix, and an adhesion material which is able to adhere the cord to the rubber or thermoplastic matrix. The cord is made of at least two yarns, such that a first yarn has a melting or decomposition point T1 and a second yarn has a melting point T2, wherein T1>T2. A ratio of a linear density of the first yarn to a linear density of the second yarn is between 1,000:1 and 1:1, wherein the second yarn is fused to the first yarn. A method of making such cords includes intertwining the first and the second yarn and then heating to a temperature between T1 and T2, with the heating step being integrated with or followed by a step wherein the cord is subjected to a dipping treatment with a rubber adhesion material.

Abstract: An improved adhesive composition and method for adhering textile reinforcing elements to rubber, particularly ethylene-propylene-diene rubber in the manufacture of rubber articles such as power transmission belts, wherein the adhesive composition comprises a latex of a hydrogenated styrene-butadiene rubber, a carboxylated hydrogenated styrene-butadiene rubber, a hyddogenated nitrile-butadiene rubber, a carboxylated hydrogenated nitrile-butadiene rubber, a chlorosulfonated polyethylene or blends thereof; an aqueous solution of a half-ester of maleinized liquid poybutadiene; and, optionally, up to about 15% by weight carbon black in an aqueous solution.

Abstract: The present invention is directed to a runflat tire having at least one of its components comprising the radial carcass ply, the underlay, the overlay, the bead inserts or the chippers, reinforced with polyester cords having a polyepoxide disposed on its surface. The polyester cord is formed by first obtaining a cord through twisting together a plurality of polyester yarns, secondly treating the cord with an aqueous dispersion comprising a polyepoxide, and thirdly treating the cord with an aqueous RFL dispersion comprising a resorcinol-formaldehyde resin, a styrene-butadiene copolymer latex, a vinylpyridine-styrene-butadiene terpolymer latex, and a blocked isocyanate.

Abstract: Poly(p-phenylene-2,6-benzobisoxazole) (“PBO”) yarn or cord is first coated with a subcoat of a mixture of (a) an aliphatic polyglycidyl ether having a flash point greater than 150° C. with enough OH-groups to be substantially water-soluble and (b) a vinyl pyridine-styrene-butadiene rubber latex (VPSBRL), then coated in a conventional RFL dip, yields a twice-coated PBO yarn; this yarn provides adhesive strength in sulfur-vulcanizable rubber which is substantially the same as, or better than, that provided by aramid yarn having the same physical dimensions and construction, and coated with an aromatic polyglycidyl ether.

Abstract: The present invention relates to a composition containing a hydrogenated nitrile-butadiene rubber (HNBR), a peroxide crosslinking system and a resorcinol-formaldehyde resin, to a process for the preparation of the composition, to the use of the composition as an adhesion promoter, and also to a multilayer product containing the composition according to the present invention.

Abstract: Fiber for reinforcing rubber products, which comprises fiber having a first coating film formed by a first coating agent comprising a condensate of resorcinol and formaldehyde, and a rubber latex, wherein the fiber has a second coating film formed by a second coating agent comprising an uncured phenol resin and a rubber, on the first coating film.

Abstract: A method of bonding an ethylene.&agr;-olefin rubber composition to a fiber cord. The method includes the steps of: treating a fiber cord with a first treating solution that is at least one of an isocyanate compound and an epoxy compound; after treating the fiber cord with the first treating solution, treating the fiber cord with a second treating solution including resorcinol-formalin-rubber latex; after treating the fiber cord with the second treating solution, treating the fiber cord with a third treating solution including a halogenated polymer and a vulcanizing agent; and after treating the fiber cord with the third treating solution, vulcanization-bonding an unvulcanized ethylene.&agr;-olefin rubber composition to the fiber cord.

Abstract: A treating agent comprises a nitrile group-containing highly saturated polymer rubber latex (A) having an iodine value of 120 or less, a rubber latex (B) other than the highly saturated polymer rubber latex, and a water-soluble resorcinol/formaldehyde condensate in amounts of 15 to 80%, 5 to 70% and 2 to 15%, all by weight in terms of solids, respectively. A rubber-reinforcing fiber product is coated with the treating agent. A rubber article such as a toothed belt, a tire and the like is made using this rubber-reinforcing fiber product. The glass fiber product coated with the treating agent may be further coated with a halogen-containing polymer-based adhesive as a secondary treating agent. Thus, the treating agent exhibits a large bonding force between the reinforcing fiber product and a matrix. Even if the rubber article is repeatedly subjected to a flexing stress, the strength thereof cannot be reduced. A peel-off cannot occurs between the reinforcing fiber product and the rubber matrix.

Abstract: Processed fiber for bonding to a rubber composition. The processed fiber consists of unprocessed fiber treated with a) a first processing liquid having at least one of an isocyanate compound and an epoxy compound, b) a second processing liquid having RFL that includes at least one rubber latex selected from acrylonitrile-butadiene rubber latex and hydrogenated nitrile rubber latex, and c) a third processing liquid having rubber paste including acrylonitrile-butadiene rubber composition dissolved in a solvent and an isocyanate compound. The weight ratio of the isocyanate compound to the acrylonitrile-butadiene rubber composition is from 1/1 to 1/3. The third processing liquid has a solid content of from 3-7%.

Abstract: There is disclosed a zinc-rich coated steel article which is characterized by an outer layer of rubber containing a weight ratio of sulfur vulcanizing agent to total accelerator ranging from 0.4:1 to 0.8:1.

Abstract: This invention relates to a method of promoting the adhesion of textiles to rubber compounds through a vinyl compound plasma pre-treatment procedure and a subsequent application of resorcinol-formaldehyde latex (RFL) to the textile surface. The inventive method encompasses a process through which free radicals of compounds comprising strong carbon--carbon bonds form a film over textile films and then covalently bonded to the resin component of the RFL. Such a method thus produces an extremely strong and versatile adhesive that facilitates adhesion between rubber compounds and heretofore unusable or difficult-to-use textiles. The resultant textile/rubber composites are utilized as reinforcements within such materials as automobile tires, fan belts, conveyor belts, and the like. Such materials and composites are also contemplated within this invention.

Abstract: The anchoring of the carcass reinforcing elements 1 is assured by circumferential cables 2, with the interposition of a connecting rubber composition 3. The circumferential cable 2 is arranged in several turns forming one or more helices. These circumferential cables have an operational elongation rate A.sub.f =A.sub.e +A.sub.p of more than 4%. This operational elongation rate does not include the specific elongation A.sub.s of the "cable" effect. The maximum stress R.sub.m of the cable 2 is preferably more than 2000 MPa. The cables have undergone a heat treatment which has, in combination, the features of being a recovery annealing treatment and which is carried out directly on cable comprising wires previously separately covered by an adherent coating.

Abstract: Process for treating a body of steel to promote its adherence to a composition which includes at least a rubber, containing the following points:a body at least the surface of which is of stainless steel is used, this steel containing at least 0.02% and at most 0.2% carbon, at least 3% and at most 20% nickel, at least 12% and at most 28% chromium, the sum of the nickel and the chromium being at least equal to 20% and at most equal to 35%, all of these percentage values being by weight; the structure of the steel includes at least 20% by volume of martensite and is without austenite or it comprises less than 80% thereof by volume;the surface of the body is activated and then treated with at least one starting silane so that it is covered with a film constituted only, or substantially only, of one or more silanes, in such a manner that this surface treated in this way can be placed directly in contact with the composition.

Abstract: This invention relates to a tire having a tread composed of quantitatively silica reinforced rubber composition, with a minor amount, if any, of carbon black where the tread elastomers are primarily composed of coupled styrene/isoprene/butadiene terpolymer with tin or silicon in combination with selected diene-based elastomers.

Abstract: This invention relates to the discovery that esters of aminobenzoic acid, when used as a replacement in whole or in part of conventional cobalt materials, maintains the rubber-to-wire adhesion properties.

Abstract: A process of bonding aromatic polyamide fibers to rubber compounds is disclosed, which comprises:the first step of treating fibers with an aqueous mixture comprising a resorcinol/formalin resin and a latex of a polymer containing halogens in amounts of not less than 45% by weight based on the polymer;the second step of treating the fibers with an aqueous adhesive composition comprising a resorcinol/formalin resin and a latex of an adhesive rubber which is compatible with the rubber in the rubber compound; andthe third step of placing the fibers in close contact with the rubber compound and vulcanizing the rubber together with the fibers. A second process is further disclosed wherein in the second step, the fibers are treated with an adhesive solution comprising at least one activating agent selected from the group consisting of polyisocyanates and polyepoxy compounds in organic solvents.

Abstract: A method and an apparatus for winding a cord continuously. A rotation of a winding bobbin around which a cord to be a tension member of a belt and so on is wound is detected directly or indirectly. A cord is forwarded in an axial direction of a winding bobbin at a pitch, which corresponds to a diameter of the cord, in relation to a rotation of a winding bobbin. And a bobbin axis of the winding bobbin is rotated at a constant speed by rotation driving means so that the cord is wound around the winding bobbin. The rotation of the bobbin axis is detected by rotation detection means directly or indirectly. The cord is forwarded in the axial direction of the winding bobbin in relation to the rotation of the winding bobbin at a pitch which corresponds to the diameter of the cord by receiving signals from the rotation detection means.

Abstract: By utilizing the process of this invention, the adhesion between polymeric reinforcements and rubber compositions can be greatly improved. This invention more specifically discloses a process for preparing a rubber article containing a polymeric reinforcement which comprises: (1) plasma treating the polymeric reinforcement in a manner whereby reactive groups containing Zerewitinoff active hydrogen atoms are bonded to the surface thereof; (2) incorporating the polymeric reinforcement having Zerewitinoff active hydrogen atoms bonded to the surface thereof into an uncured rubber composition, wherein said rubber composition has pendant blocked isocyanate groups bound thereto; and (3) curing the uncured rubber into the desired shape for the rubber article at an elevated temperature sufficient to deblock the isocyanate groups bonded to the uncured rubber allowing for the isocyanate groups to react with the Zerewitinoff active hydrogen atoms bonded to the surface of the polymeric reinforcement.

Abstract: A process of bonding aromatic polyamide fibers to rubber compounds is disclosed, which comprises:the first step of treating fibers with an aqueous mixture comprising a resorcinol/formalin resin and a latex of a polymer containing halogens in amounts of not less than 45% by weight based on the polymer;the second step of treating the fibers with an aqueous adhesive composition comprising a resorcinol/formalin resin and a latex of an adhesive rubber which is compatible with the rubber in the rubber compound; andthe third step of placing the fibers in close contact with the rubber compound and vulcanizing the rubber together with the fibers.A second process if further disclosed wherein in the second step, the fibers are treated with an adhesive solution comprising at least one activating agent selected from the group consisting of polyisocyanates and polyepoxy compounds in organic solvents.

Abstract: A pneumatic radial tire for airplanes comprises a toroidal carcass of at least two carcass plies, a tread rubber superimposed on the carcass, and a belt disposed between the carcass and the tread rubber, in which the belt is comprised of a plurality of radially inner belt plies and a plurality of radially outer belt plies, and each of the radially inner belt plies contains cords extending substantially zigzag at a cord angle A of 5.degree.-15.degree. with respect to the equatorial plane in the circumferential direction while axially being bent at both side ends of the ply, and each of the outer belt plies contains cords having a cord angle B larger than the cord angle A. In this tire, the occurrences of standing wave and cut peel off are prevented with the reduction of tire weight.

Abstract: A rubbery composite material comprising a substrate and a rubber composition bonded thereto is prepared by metallizing a substrate with a thin film of zinc, copper, cobalt or an alloy thereof by dry plating such as vacuum deposition, ion plating, DC magnetron sputtering, bipolar sputtering, and RF sputtering processes, and pressing a vulcanizable rubber composition to the metallized substrate under heat and pressure to effect vulcanization bonding.

Abstract: A laminate of rubber and steel cord, which may be brass coated steel where the rubber is comprised of elastomer, carbon black, optionally silica, dithiodipropionic acid and prescribed methylene donor material. In one aspect, a tire is provided having at least one component as such laminate.

Abstract: When polyester fiber cords having elongations under loads of 0.5 g/d and 2.25 g/d within particular ranges and a heat shrinkage (177.degree. C. 30 minutes) within a particular range are used in a carcass ply of a pneumatic radial tire, the ride comfortability, tire uniformity and tire appearance can simultaneously be improved.

Abstract: A heavy duty high speed cross ply tire has a carcass composed of at least one aromatic polyamide fiber cord ply, the product T.sqroot.D of the cable twist number T (turns/10 cm) of the belt cord and the square root of the total denier number D (deniers) of the cord is 2.466.times.10.sup.3 to 3.036.times.10.sup.3 and the elongation E (%) at breakage of the belt cord divided by the total denier number D is 7.78.times.10.sup.-4 to 12.22.times.10.sup.-4.

Abstract: A process of bonding aromatic polyamide fibers to rubber compounds is disclosed, which comprises:the first step of treating fibers with an aqueous mixture comprising a resorcinol/formalin resin and a latex of a polymer containing halogens in amounts of not less than 45% by weight based on the polymer;the second step of treating the fibers with an aqueous adhesive composition comprising a resorcinol/formalin resin and a latex of an adhesive rubber which is compatible with the rubber in the rubber compound; andthe third step of placing the fibers in close contact with the rubber compound and vulcanizing the rubber together with the fibers.A second process is further disclosed wherein in the second step, the fibers are treated with an adhesive solution comprising at least one activating agent selected from the group consisting of polyisocyanates and polyepoxy compounds in organic solvents.

Abstract: A method for preparing a rubber-based composite material by joining a base material and a rubber composition together by heat pressure bonding can achieve strong bonding without using any adhesives, wherein a monomer is polymerized by atmospheric-pressure glow discharge plasma technique to form a polymerized film having unsaturated bonds on the surface of the base material and then the rubber composition is bonded to said polymerized film by heat pressure bonding to join the base material and the rubber together.

Abstract: A method for preparing a rubber-based composite material by joining a base material and a rubber composition together by heat pressure bonding can achieve strong bonding without using any adhesives, wherein a monomer is polymerized by low-pressure glow discharge plasma technique to form a polymerized film having unsaturated bonds on the surface of the base material and then the rubber composition is bonded to said polymerized film by heat pressure bonding to join the base material and the rubber together.

Abstract: A heavy duty high speed radial tire has a belt composed of at least one aromatic polyamide fiber cord ply, the product T.multidot..sqroot.D of the cable twist number T (turns/10 cm) of the belt cord and the square root of the total denier number D (deniers) of the cord is 2.466.times.10.sup.3 to 3.036.times.10.sup.3, and the elongation E (%) at breakage of the belt cord divided by the total denier number D is 7.78.times.10.sup.-4 to 12.22.times.10.sup.-4.

Abstract: The present invention is directed to bead wires which has a Cu/Sn deposit having an Sn content of 9 to 13% by weight and a Cu content of 91 to 87% by weight, in an amount of 0.65 to 0.85 g per kilogram of the wire. The present invention is also directed to rubber-coated bead wires for tires comprising the plated bead wire as mentioned above, a rubber layer formed on the bead wire from a composition comprising 100 parts of a rubber polymer, 80 to 140 parts of a carbon, 4 to 10 parts of sulfur, 0.4 to 0.9 part of a vulcanization accelerator, 10 to 7 parts of zinc oxide, and 1 to 4 parts of stearic acid, and to tires prepared by using the above-mentioned bead wires. The bead wires of the present invention have excellent adhesion between the plated bead wire and the rubber layer, so that the tires obtained using such bead wires avoid wild wires.

Abstract: A process for producing a fiber-rubber composite comprising:a polyester fiber treated with (1) an adhesive composition (AR) consisting mainly of a latex (A) of a vinylpyridine-conjugated diene type copolymer containing a vinylpyridine unit in an amount of not less than 20% by weight but not more than 70% by weight and a resorcinol-formaldehyde resin and then with (2) an adhesive composition (BR) consisting mainly of a latex (B) of a nitrile group-containing highly saturated copolymer rubber having an iodine value of 120 or less obtained by emulsion polymerization or by emulsion polymerization followed by hydrogenation in the emulsion state and a resorcinol-formaldehyde resin, anda nitrile group-containing highly saturated copolymer rubber having an iodine value of 20 or less, which process comprises bonding said polyester filber and said nitrile group-containing highly saturated copolymer rubber having an iodine value of 20 or less, by vulcanizing by a peroxide vulcanizing system.

Abstract: Rubber-reinforcing fiber cords are disclosed which are constituted by at least one kind of fibers selected from a group consisting of aromatic polyamide fibers, entire aromatic polyester fibers and polyvinylalcohol fibers having a tenacity of not less than 15 g/d. Spaces among filaments constituting the cord are each impreganted with a rubbery material. Radial tires are also disclosed which each comprise at least one pair of bead wires, at least one carcass ply cord layer and at least one belt ply cord layer. Carcass ply cords and/or belt ply cords are constituted by the above rubber-reinforcing fiber cords.

Abstract: A method of granulating resorcinol/silica mixtures which comprises transporting a mixture of resorcinol and precipitated silica by conveyor worms to two pressing rollers whose shafts are attached vertically above one another and whose contact pressure can be varied, compacting said mixture between said rollers, breaking up the compacted mixture with a cake breaker to obtain a granulate with minimum grain size and separating the remaining dusty portion of said mixture. The mixtures can be added to vulcanizable rubber to provide improved adhesion to rubber reinforcements.

Abstract: The present invention relates to a method of improving the adhesion between an aramid cord and sulfur vulcanized rubber comprising (a) treating the aramid cord with a copolymer of the structural formula: ##STR1## wherein w is an integer of from 1 to 100, y is an integer of from 10 to 500; z is an integer of from 1 to 120; X is: ##STR2## or mixtures thereof; B is: ##STR3## or mixtures thereof; wherein R is selected from the group consisting of H, Cl or CH.sub.3 ; and(b) vulcanizing a composite of the treated cord and rubber.

Abstract: A pneumatic radial tire including at least one ply of carcass layer comprising a number of cords disposed at right angle with respect to a circumferential direction of the tire and anchored at a pair of beads, said cords of the carcass layer being treated with adhesive treating agents, i.e. an epoxy treating agent and a RFL treating agent, at the stage of both yarns and cords, said cords being formed by twisting at least two treated strands which are formed by twisting yarns treated with both the epoxy treating agent and the RFL treating agent and said cords being further treated with at least the RFL treating agent.

Abstract: A tensile cord manufacture wherein polyester multifilament cords are heat treated and drawn to provide tensile cords for use in power transmission belts. Preselected characteristics of the original cord, parameters of heat treating and drawing, and characteristics of the formed tensile cords required to provide the improved features of the invention are set forth.

Abstract: High strength steel wire for use e.g. in tire reinforcement is treated so as to have a cementite free surface region. This can be achieved by electroplating or other coating methods, or be decarburizing the surface. The wire has increased resistance to hydrogen embrittlement and corrosion fatigue. The wire with its ferrous surface region is then covered with a rubber adherent outer layer of e.g. brass.

Abstract: A method of bonding fibers to hydrogenated nitrile rubber which comprises:the first step of treating fibers with an activating agent selected from the group consisting of polyisocyanates, epoxy compounds and silane coupling agents;the second step of dipping the fibers into a resorcinol/formalin/latex solution;the third step of treating the fibers with an adhesive composition which comprises (a) 1-90% by weight of polymers, based on the composition, the polymers containing halogens in amounts of 25-70% by weight based on the polymers, and (b) 10-99% by weight of polyisocyanates, aromatic polynitroso compounds or polyepoxy compounds; andthe fourth step of placing the fibers in close contact with hydrogenated nitrile rubber and vulcanizing the rubber together with the fibers.The resultant composites have large strength and high resistance to fatigue from repeated flexure.

Abstract: A composition for the adhesive activation of polymeric material. The composition is comprised of a non-resinous quaternary ammonium salt of a polyepoxide wherein the nitrogen atom of the ammonium group is bonded directly to a carbon atom of the polyepoxide and wherein the composition is substantially free of free amine. The composition may be used as a spin finish or topcoat composition and is particularly useful in the preparation of polyethylene terephthalate tire cord which is ultimately incorporated into rubber.

Abstract: A rubbery composite material comprising a substrate and a rubber composition bonded thereto is prepared by metallizing a substrate with a thin film of zinc, copper, cobalt or an alloy thereof by dry plating such as vacuum deposition, iron plating, DC magnetron sputtering, bipolar sputtering, and RF sputtering processes, and pressing a vulcanizable rubber composition to the metallized substrate under heat and pressure to effect vulcanization bonding.

Abstract: A process for the improvement of the adhesion to rubber or a thermoplastic elastomer of synthetic yarns, cords or fabrics made therefrom by applying thereto an adhesive consisting of an aqueous solution or dispersion of a polyurethane with ionic groups, capped isocyanate groups and groups with a Zerewitinoff-active H atom, followed by drying the product thus treated. The polyurethane corresponds to the structure: ##STR1## wherein X has the meaning of an O or S atom or of an O-, S-, N- or P-containing group with a Zerewitinoff-active H atom or to which prior to reaction with an isocyanate group a Zerewitinoff-active H atom had been attached,R.sub.1 represents the remainder of a capping agent,R.sub.2 represents an at least divalent organic group which remains after removal of isocyanate groups from a polyisocyanate,R.sub.3 represents an at least divalent organic group which remains after removal of --XH groups from an organic compound having a molecular weight of 62 to 2000,R.sub.

Abstract: An improved halogenated butyl rubber wherein the polymer has a conjugated diene content of less than 0.25 mole % and a halogen content of at least 0.6 wt. %; at least 20 mole % of the halogen being in a primary allylic configuration.