Abstract: Described is an aqueous sprayable glass fiber binding composition comprising: a) an aqueous compatible formaldehyde thermosetting coating composition; and b) a compatible aqueous latex elastomeric composition. Also described are binder compositions that decrease fallout of glass fiber and binder from the coated glass fiber. Also disclosed is a glass fiber binder composition having low odor content.

Abstract: Acid etch resistant coating compositions and their use as clear coats in color-plus-clear composite coatings is disclosed. The compositions comprise acrylic polymers prepared with high levels of cycloaliphatic or aromatic ester of (meth)acrylic acid and hydroxypropyl- or hydroxybutyl(meth)acrylates and aminoplast crosslinking agents.

Abstract: The invention relates to a molded product containing 65 to 95% by weight of a polymer composition and 5 to 35% by weight of an inorganic filler. The polymer composition is a mixture of 45 to 70 parts by weight of a polypropylene resin having a melt flow rare of 10 to 60 g/10 minute and containing 0 to 8% by weight of ethylene, and 30 to 55 parts by weight of an amorphous ethylene-.alpha.-olefin copolymer. The proportion (D) of the filler and that (C) of the copolymer have the relation expressed as D>155-37 lnC. The copolymer is a mixture of 30 to 60% by weight of a high-molecular copolymer having a weight-average molecular weight of 380,000 to 1,000,000 and 40 to 70% by weight of a low-molecular one having weight-average molecular weight of 150,000 to 330,000. The product has a coefficient of linear expansion not exceeding 5.0.times.10.sup.-5 cm/cm/.degree.C.

Abstract: Heat-stable moldings for brake linings, clutch linings and grinding tools are produced by molding and vulcanizing a mixture containing a natural or synthetic rubber in the presence of a sulfur-free vulcanizer/activator system comprising phenol resols which contain at least 90 mol % of p-(C.sub.3 -C.sub.12)-alkylphenols, based on the total amount of phenols, and a substance, or mixture of substances, which acts as a Bronsted or Lewis acid under the reaction conditions of the rubber-vulcanization, at a temperature of 120.degree. to 250.degree. C.

Abstract: This invention relates to a composition suitable for use in friction elements and comprises a frictional material and a binder, the latter being a blend of a polyvinyl alkyl ether with a phenolic resin and optionally a rubber.Compared with conventional friction elements based on organic polymers, the elements produced using the compositions of the present invention shows increases in flexural strength of up to 50% with no loss in wear or friction performance.

Abstract: Rubber vulcanizates having a reduced heat evolution when subjected to dynamic deformation, prepared from vulcanizable rubber mixtures containing at least one type of rubber, a reinforcing resin system based on curable phenolic resins and other customary constituents, the vulcanizable rubber mixtures having been prepared from at least two rubber mixtures of different compositions. A process for their preparation by preparing in each case at least two different rubber mixtures differing from one another in their content of rubber, filler, oil, reinforcing resin system and, if appropriate, thermoplastic copolymer, by mixing the constituents thereof, then mixing the resulting mixtures with one another and vulcanizing the resulting final mixture. The use of the vulcanizable rubber final mixtures is for the production of mechanical rubber goods and tires.

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: A phenolic resin composition comprising 20-40 parts by weight of a resole type phenolic resin, 5-15 parts by weight of a novolac type phenolic resin, 3-10 parts by weight of a carboxy-modified acrylonitrile-butadiene rubber and 35-65 parts by weight of an inorganic filler.

Abstract: Polyhydric alcohol rosin esters which had been modified with an aromatic dibasic acid such that the softening point of the acid-modified polyhydric alcohol rosin ester is higher than that of a comparable unmodified polyhydric alcohol rosin ester are used as tackifiers in hot melt adhesive compositions. The hot melt adhesives compositions which utilize the acid-modified rosin ester tackifiers contain at least one of an ethylenic copolymer and a styrenic block copolymer, at least one of a wax and an oil, and the acid-modified polyhydric alcohol rosin ester tackifier. The hot melt adhesive compositions may be used as, for example, hot melt carton and package sealing adhesives, sealants, bookbinding adhesives, assembly adhesives, and are useful for the assembly of disposable articles using multiline construction techniques wherein at least one polyethylene or polypropylene substrate is bonded to at least one tissue, non-woven, polyethylene or polypropylene substrate.

Abstract: An aqueous coating composition capable of forming a film having excellent water resistance, high hardness, excellent processability and excellent shelf stability, and the coating composition comprises:(a) 30 to 65 parts by weight of an aqueous acrylic resin, which is produced by copolymerizing monomers (i) to (v):(i) 25 to 35% by weight of at least one aromatic vinyl monomer,(ii) 25 to 45% by weight of at least one alkyl (meth)acrylate,(iii) 1 to 15% by weight of at least one .alpha.,.beta.-monoethylenically unsaturated carboxylic acid,(iv) 5 to 25% by weight of at least one hydroxyalkyl (meth)acrylate, and(v) 1 to 25% by weight of at least one N-alkoxymethyl (meth)acrylamide,(b) 20 to 50 parts by weight of an aqueous amino resin, and(c) 5 to 25 parts by weight of a polyol,provided that the total amount of the above (a), (b) and (c) is 100 parts by weight.

Abstract: A roofing adhesive particularly suited for use in connection with membrane roofing materials such as EPDM or neoprene is preferably compounded from butyl rubber, a cross-linking system for the butyl rubber and a tackifier. The tensile strength, elongation, modulus at 300% elongation and modulus at failure of the composition are adjusted within range by choice of components and concentration. The adhesive composition may preferably be formed into a tape for joining sheets of the membrane roofing material.

Abstract: A reinforced polypropylene composition comprising from 50 to 80% by weight a resin component comprising from 35 to 90 parts by weight a crystalline polypropylene (A) from 5 to 60 parts by weight a polyethylene resin (B), and from 5 to 30 parts by weight an aromatic hydrocarbon resin (C), the sum of (A), (B), and (C) being 100 parts by weight; from 15 to 45% by weight talc (D); and from 1 to 40% by weight glass fiber (E); the sum of the talc and the glass fiber being not more than 50% by weight, wherein the percentages are based on the sum of (A)+(B)+(C)+(D)+(E).

Abstract: A novel adhesive composition capable of bonding strongly polyester fibers and rubbers with reduced adhesive deterioration even at high temperatures is provided which comprises, as a predominant component, a co-condensation resin obtained by co-condensing at least one member selected from compounds (I) represented by the following general formula, ##STR1## wherein R.sub.1 and R.sub.2 are hydrogen atoms, alkyl groups or alkoxy groups, the sum of carbon atoms of R.sub.1 and R.sub.2 being 0 to 4, at least one member selected from compounds (II) represented by the following general formula, ##STR2## wherein R.sub.3, R.sub.4 and R.sub.5 are hydrogen atoms or alkyl groups, the sum of carbon atoms of R.sub.3, R.sub.4 and R.sub.5 being 0 to 4, and aldehyde.

Abstract: An aniline-resorcin-formaldehyde copolycondensation product having a particular mol ratio of aniline to resorcin is used in an adhesive composition for well adhering fibrous material to rubber.

Abstract: A coating composition comprises 0.1 to 10% by weight of a linear polyester polyurethane, 2 to 25% by weight of at least one organic solvent-soluble phenolic resin, 3 to 18% by weight of a halogenated resin selected from the group consisting of halogenated rubber, halogenated polyolefins and halogenated vinyl halide polymers and an inert solvent in an amount sufficient to provide an adhesive primer having a solids content of 10 to 70% by weight.

Abstract: A rubber composition used for passenger car tire, particularly as bead filler thereof comprises particular amounts of carbon black and at least one resin obtained by adding amine as a curing agent for resin to a novolak type phenolic resin modified with at least one of animal oil, vegetable oil, unsaturated oil, aromatic hydrocarbon and nitrile rubber for the provision of self curability, based on 100 parts by weight of particular rubber component usually used in the tire.

Abstract: Disclosed are an aqueous matte coating composition containing an aqueous dispersion (I) formed by dispersing into water (A) a water-dispersible vinyl copolymer having an acid value of 15 to 150 and a hydroxyl value of 30 to 200 and hving alkoxysilane group on its side chain and (B) a melamine resin not having complete compatibility with said vinyl copolymer (A); and an aqueous matte coating composition containing an aqueous dispersion (II) of the vinyl copolymer (A), and an aqueous dispersion (III) formed by dispersing into water (B) a melamine resin not having complete compatibility with the vinyl copolymer (A) and (C) a water-dispersible vinyl copolymer having neither alkoxysilane group nor complete compatibility with the melamine resin (B), and having an acid value of 15 to 150 and a hydroxyl value of 30 to 200.

Abstract: (A) Water-absorbent coating compositions comprising (1) a nonaqueous dispersion of a resin, or a solution of a resin, and (2) a water-in-oil type emulsion of a water-swellable polymer with an average particle size not greater than 10 .mu.m; and a process for coating the same which uses a proper primer. (B) Water-absorbent coating compositions which comprise 100 parts by weight (on dry basis) of a resinous solution and 10 to 150 parts by weight (on solid basis) of a dehydrated water-in-oil type emulsion of a water-swellable polymer with an average particle size not greater than 10 .mu.m and which gives coated film with an elongation not lower than 30%.

Abstract: A coating composition comprising about 50 to 30% by weight of a blocked isocyanate-functional urethane prepolymer, 2 to 25% by weight of at least one organic solvent-soluble phenolic resin, 0.5 to 18% by weight of a halogenated resin selected from the group consisting of halogenated rubber, halogenated polyolefins and halogenated vinyl halide polymers and an inert solvent in an amount sufficient to provide an adhesive primer having a solid content of 10 to 70% by weight.

Abstract: Elastomer structures having exposed controlled surface release characteristics can be made by coating at least a portion of their surface with a releasing composition comprising (a) a chlorosulphonated polymer; (b) a reinforcing filler and (c) a green tackifying agent. Optionally, these compositions can also contain a chemical curing system and one or more volatile solvent/diluent viscosity-reducing vehicle. In a specific example, the coating are applied to flexible structures used in machines for the manufacture of articles having natural tack due to their rubber or elastomer content.

Abstract: A hair-treating and skin-treating composition comprising a liquid preferably aqueous dispersion containing a mixture of two type of polysiloxanes, one being amino- and hydroxy- or alkoxy-functional, the other being carboxy- or carboxyl-ester-functional containing at least two carboxyl groups, the composition being characterized by ready removability from hair and skin after drying by washing.

Abstract: Rubber vulcanizates having a reduced heat evolution when subjected to dynamic deformation, prepared from vulcanizable rubber mixtures containing at least one type of rubber, a reinforcing resin system based on curable phenolic resins and other customary constituents, the vulcanizable rubber mixtures having been prepared from at least two rubber mixtures of different compositions. A process for their preparation by preparing in each case at least two different rubber mixtures differing from one another in their content of rubber, filler, oil, reinforcing resin system and, if appropriate, thermoplastic copolymer, by mixing the constituents thereof, then mixing the resulting mixtures with one another and vulcanizing the resulting final mixture.The use of the vulcanizable rubber final mixtures for the production of mechanical rubber goods and tires.

Abstract: A sonic window suitable for use in sonar applications wherein an elastomer such as natural or synthetic natural rubbers, a low air entrapping fiber or fibril used for reinforcement, fillers, and thermosetting resins are formed into desired window configuration. The low air entrapment associated with the fiber or fibrils produces a remarkably sonicly transparent window.

Abstract: The present invention provides thermoplastic flame-retardant moulding compositions containing halogen-containing copolycarbonates, styrene/maleic anhydride copolymers, phosphorus compounds of the formula (I) ##STR1## and tetrafluoroethylene polymers and, if desired, further known additives.

Abstract: A coating composition comprises 5 to 30 wt % of a blocked isocyanate-functional urethane prepolymer, 2 to 25 wt % of at least one organic solvent-soluble phenolic resin, 3 to 18 wt % of a halogenated resin selected from the group consisting of halogenated rubber, halogenated polyolefins and halogenated vinyl halide polymers and an inert solvent in an amount sufficient to provide an adhesive primer having a solids content of 10 to 70 wt %.

Abstract: Disclosed is a composition that is polymerizable by contacting it with an olefin metathesis catalyst comprising dicyclopentadiene, red phosphorus, and a brominated aromatic compound selected from the group consisting of decabromodiphenyl oxide, N,N'-ethylene-bis-(tetrabromophthalimide), brominated polystyrene, brominated polyphenylene oxide, tetradecabromodiphenoxy benzene, tetrabromoxylene, and octabromodiphenyl oxide.

Abstract: A phenolic compound having improved retention of useful properties over long periods of time at elevated temperatures is presented. The novel phenolic compound, preferably a glass reinforced phenol-formaldehyde with mineral fillers has incorporated therein elastomers which primarily undergo crosslinking on oxidative aging, such as butadiene based rubbers, and/or molecular sulfur or sulfur donor components. These additives unexpectedly retard thermal degradation with time of aging and provide exceptionally good retention of weight, molded dimensions and mechanical properties.

Abstract: The present invention relates to thermoplastic moulding compositions consisting of halogen-free polycarbonates, styrene/maleic anhydride copolymers, phosphorus compounds of the formula (I) ##STR1## and tetrafluoroethylene polymers and, where appropriate, other known additives.

Abstract: Disclosed is a high-performance tire in which a bead filler formed of a rubber composition fills up a space between each turn-up portion of the carcass and a major portion of the carcass and extends to some extent along the carcass toward the tread. The rubber composition is anisotropic such that the elastic modulus in the direction circumferential of the tire is distinctly higher than in the direction radial of the tire. Such anisotropy can be produced by incorporating short fiber of a suitable thermoplastic polymer such as nylon into the rubber composition. This tire provides both improved controllability and a good ride.

Abstract: An acrylic modified styrenic/N-arylmaleimide copolymer containing composition which exhibits excellent melt flow properties, impact strength and gloss upon molding is disclosed.

Abstract: A reinforced rubber mixture composed of (A) at least one natural, styrene/butadiene, polybutadiene, polyisoprene, transpolyoctenylene, ethylene/propylene/diene terpolymer and butyl rubber, (B) at least one phenol novolak resin and/or reactive polyphenol, (C) curing agents and, if appropriate, (D) customary additives, wherein the rubber mixture contains, as an additional component (E), at least one polar, chlorine-free rubber in the form of nitrile rubber having a nitrile content of at least 32% or polyurethane rubber in a proportion by weight of 1 to 49% by weight, relative to the total amount of rubber. Process for the preparation thereof and the use of the reinforced rubber mixtures for the production of industrial rubber goods, in particular for the production of antivibration units, rubber sleeves, coatings, conveyor belts and tires.

Abstract: Polynetwork EPDM rubber is EPDM rubber containing both ionomeric and covalent cross-links, and can be formed by treating EPDM rubber with maleic acid or anhydride or fumaric acid to attach succinic groups to the rubber, forming an ionomer thereof with a polyvalent metal oxide, hydroxide or salt, and then covalently cross-linking the rubber, for example, by sulfur vulcanization. Compositions are shown containing the polynetwork rubber in combination with oil and black, optionally in blends with high-diene hydrocarbon rubber, such as natural rubber.

Abstract: A phenolic compound having improved retention of useful properties over long periods of time at elevated temperatures is presented. The novel phenolic compound, preferably a glass reinforced phenol-formaldehyde with mineral fillers has incorporated therein elastomers which primarily undergo crosslinking on oxidative aging, such as butadiene based rubbers, and/or molecular sulfur or sulfur donor components. These additives unexpectedly retard thermal degradation with time of aging and provide exceptionally good retention of weight, molded dimensions and mechanical properties.

Abstract: Adhesive compositions for bonding EPDM elastomers comprise (a) a neutralized sulfonated EPDM elastomeric terpolymer; (b) an organic hydrocarbon solvent; (c) an ionic plasticizer or mixture of ionic plasticiziers; (d) a phenolic hydrocarbon resin or mixture of phenolic hydrocarbon resins and (e) a material selected from mineral oils, petroleum oils, polybutenes, polyisobutylenes and ethylene/propylene copolymers. Such adhesive compositions are particularly suitable for bonding sheets of black EPDM, especially sheets of cured black EPDM, elastomeric membranes together and may also be utilized to bond sheets of cured black EPDM to other uncured elastomers and to non-elastomeric substrates as well.The adhesive compositions to proper selection of the component (e) material and the addition of a color pigment or dye thereto may also be used to bond colored EPDM elastomers such as white, blue, yellow, green, etc.

Abstract: A halogen-free flameproofed thermoplastic molding material consists of a halogen-free thermoplastic resin (A) and one or more further halogen-free components.The thermoplastic resin (A) is present in an amount of from 30 to 90% by weight, based on the molding material. The latter contains, as further components, from 1 to 50% by weight of a phenol/aldehyde resin (B), from 1 to 50% by weight of a nitrogen-containing organic compound (C) and from 3 to 50% by weight of a phosphorus-containing organic compound (D), the percentages in each case being based on the molding material.The molding material is used for the production of flameproofed moldings.

Abstract: A particulate material adapted to be poured into the opening in the bottom of a top pouring ingot mold, tamped in the opening and then cured therein to form a mold plug is comprising of a plug forming aggregate and first and second binders of thermosetting resinous material having different temperatures at which polymerization of the corresponding resin commences.

Abstract: There is disclosed a method for adhering rubber to reinforcing materials which comprises embedding a textile fiber or metal reinforcing material in a vulcanizable rubber composition comprising rubber, a vulcanizing agent, reinforcement, a methylene donor, and a phenolic ester as a methylene acceptor.

Abstract: A material intended to form a joint between at least two bodies on the outside of their interface, at least one of the bodies being deformable, is characterized by the following features:(a) it is formed of a fluid mixture having a viscosity, measured at normal temperature, of from 0.3 Pa.s to 700 Pa.s;(b) a dry extract of the fluid mixture, measured at normal temperature and pressure, is from 20% by weight to 80% by weight, based on the weight of the fluid mixture;(c) the dry extract of the fluid mixture comprises an elastomer fraction at least 20% by weight of which elastomer fraction is formed of at least one unsaturated elastomer capable of cross-linking either at ambient temperature or by heating for a period of time of less than one minute.Methods for producing assemblies with this material, consisting, for instance, of manufacturing, repairing or recapping a tire.Assemblies obtained by these methods.

Abstract: An adhesive composition for bonding fibers to a rubber is made of an aqueous dispersion composed mainly of a resorcinol/formaldehyde resin and a rubbery vinylpyridine copolymer latex. Particles of the rubbery vinylpyridine copolymer latex having a weight-average particle size of at least 0.15 micron, provided when the weight-average particle size is less than 0.16 micron, the particles having a particle size of at least 0.18 micron amount to at least 5% by weight.

Abstract: Rubber vulcanisates based on mixtures which contain at least 55% of active fillers and at least 10% of plasticizing oils, having Shore A hardnesses of below 65.degree. in which the active filler contains inorganic active fillers and 10 to 60% of phenolic resin systems consisting of novolaks and hardeners therefor, all these percentages being based on the weight of the rubber, the weight ratio of active inorganic fillers to the phenolic resin systems being from (9:1) to (1:9); the invention further relates to a process for producing such vulcanisates and rubber articles and tires produced from said vulcanisates.

Abstract: In a process for the preparation of reinforced vulcanisates by vulcanisation of compositions comprising natural rubber or synthetic diene rubber with novolak resins in the presence of from 0.5 to 120% by weight, based on the novolak resin, of a hardener of a reactive melamine resin obtained by reacting melamine with 0.5 to 6 mol of an aldehyde the improvement comprises that, instead of or together with the reactive melamine resins other aminoplast forming compounds containing hydroxy groups are used and the total amount of the aminoplast-forming compounds is also from 0.5 to 120% by weight, referred to novolak resin, a rubber article and vehicle tire prepared according to this process.

Abstract: Novel copolyester-carbonates exhibiting improved processability comprised of the polymerized reaction products of (i) at least one dihydric phenol, (ii) at least one difunctional carboxylic acid or a reactive derivative thereof, (iii) a carbonyl halide carbonate precursor, and (iv) a processability improving amount of at least one particular bishaloformate.

Abstract: A rubber mixture is provided for direct bonding to metal surfaces, and includes a base of natural and/or synthetic rubber which contains fillers, processing aids, vulcanizing agents, a bonding agent in the form of a phenol, or derivatives thereof, which form phenolic resins with formaldehyde, a source of formaldehyde, and metallic compounds, preferably oxides of metals, the outer electron shell of which has 2s electrons. The metallic compounds are present in a measured quantity which is about 30 to 400 mMol above the conventional dosage of 40 to 60 mMol for activating the polymerization, with this measured quantity being applicable to each 100 g of rubber. The measured quantity of bonding agent ranges from two to four times the conventional quantity of 40 mMol per 100 g rubber.

Abstract: This disclosure relates to novel adhesive compositions and composite structures utilizing the same, wherein said adhesive compositions contain an elastomer, a chemically compatible ethylenically unsaturated monomer, a tackifier, an adhesion promoter, and optionally, pigments, fillers, thickeners and flow control agents which are converted from the liquid to the solid state by exposure to high energy ionizing radiation such as electron beam. A particularly useful application for such adhesive compositions comprises the assembly of certain composite structures or laminates consisting of, for example, a fiber flocked rubber sheet and a metal base with the adhesive fulfilling the multiple functions of adhering the flocked fiber to the rubber sheet as well as adhering the rubber sheet to the metal base.

Abstract: A resin composition comprising(I) a granular or powdery resin which is a condensation product of a phenol, an aldehyde and optionally a nitrogen-containing compound having at least two active hydrogens and is characterized by (A) containing spherical primary particles and their secondary agglomerated particles each having a particle diameter of 0.1 to 150 microns, (B) having such a size that at least 50% by weight thereof can pass through a 100 Tyler mesh sieve, and (C) having a free phenol content, determined by liquid chromatography, of not more than 500 ppm, and(II) at least one member selected from the group consisting of (1) a rubbery elastic material, (2) a thermoplastic resin and (3) a curable reisn other than said granular or powdery resin (I) and/or a filler material other than said granular or powdery resin (I).

Abstract: A method of preparing a thermoplastic, water-soluble, phenolic aldehyde resin and the composition are provided to enhance the flexibility and resistance to compression fatigue breakage of glass fibers to which the resin has been applied. The method involves two steps. In the first step, the phenolic compound and the aldehyde are reacted to less than 100 percent completion in an amount so that the aldehyde to phenolic compound ratio is in the range of about 0.6 to about 1.5 and at an acidic pH and for a period of time equivalent to about 3 hours to about 10 hours when the temperature is in the range of about 55.degree. F. (13.degree. C.) to about 90.degree. F. (32.degree. C.) to produce a resinous mixture. In the second stage the pH of the reaction is adjusted within the range above about 7.0 to about 7.

Abstract: In a process of curing solution-polymerized synthetic rubbers, the improvement effected is the retardation of the cure rate and increasing of time to scorch by the addition of small amounts of a heat-curable phenol-formaldehyde resin. This method of controlling cure rate and scorch time complements other techniques known in the art (e.g., cure accelerators), and can be used to adjust the properties of solution-polymerized rubbers to match those of emulsion-polymerized rubbers.

Abstract: An adhesive composition for bonding cured layers of EPDM together is provided which comprises a neutralized sulfonated EPDM elastomeric terpolymer, an organic hydrocarbon solvent or mixture of an organic hydrocarbon solvent and an aliphatic alcohol, a para-alkylated phenol formaldehyde tackifying resin and an alkylphenol or ethoxylated alkylphenol. A method for bonding the cured layers of EPDM together utilizing the adhesive composition is also provided.

Abstract: A method and composition for forming a dry free-flowing particulate solid is disclosed which utilizes a novel binder system for bonding particles of carbon, sand and/or other solid particulate materials. The solid, non-sticky binder system comprises furfural, solid resin, (such as a phenolic resin), which is not sticky at room temperature and is soluble in furfural, and a liquid amine having free hydrogens on the amine nitrogen which amine is capable of reacting with furfural. This system is capable of adhering to such particles while retaining the free-flowing characteristics of the particles. The free-flowing particulate solid thus formed may be shaped, extruded or compression molded as necessary to form the desired article. A shaped mass of this particulate material is converted to an integral mass by warming or compressing. While the binder is curable at room temperature over a long period of time, the cure rate may be accelerated by increases in temperature.

Abstract: A sealant composition particularly suitable for vehicle tires comprising a cured butyl rubber present only in the form of a copolymer having a molecular weight in excess of 100,000 and one or more tackifiers, the tensile strength, elongation and cross-link density of the composition being adjusted to produce the necessary properties for tire sealants.