Abstract: Thermoplastic compositions comprising mixtures of ground vulcanized rubber and polyolefin resin are described; they are improved by incorporation of functionalized olefin polymer.

Abstract: Rubber compositions are disclosed for integral attachment of polymeric and metallic materials. Improved bondability is attributed to the use of a selected base rubber blended with a selected class of inorganic or organic fillers, silane compounds and vulcanizing agents such that the finished composition is provided with a specified range of Mooney viscosities. Also disclosed is a method of hose-metal fitting connection by the application of the composition. Gas- and oil-impermeability characteristics are greatly enhanced.

Abstract: Disclosed is a thermoplastic elastomer composition excellent in the injection fusion bondability and the surface gloss, which comprises (1) an amorphous ethylene/.alpha.-olefin copolymer (a) and (2) (i) a lowly crystalline copolymer (b) of propylene with an .alpha.-olefin having at least 4 carbon atoms, (ii) a polymer (d) composed mainly of 1-butene or (iii) a combination of the copolymer (b) or the polymer (d) with a crystalline polymer (c) composed mainly of propylene, wherein the component (l) is present in an amount of 10 to 95% by weight based on the total amount of the components (1) and (2), the component (2) is present in an amount of 5 to 90% by weight based on the total amount of the components (1) and (2), and the component (1) or the components (1) and (2) are partially crosslinked.The partial crosslinking is effected by grafting of a radical-polymerizable monomer having at least two polymerizable groups.

Abstract: Polymer blends are provided comprising a glassy thermoplastic polymer having a glass transition temperature above ambient conditions, e.g., normal room temperature and between 0.1 and 4.0 weight percent of a rubbery polymer having a glass transition temperature below ambient temperature conditions, e.g., normal room temperature based on the weight of the blend. The blends can be produced by solution casting or by coagulation from solution followed by flocculation.

Abstract: Rubber mixtures for tire treads are found, which show an improved wet skid resistance coupled with balanced abrasion and rolling resistance properties. This is achieved by rubber blend mixtures which contain 3,4-polyisoprene having a 3,4-content from 55 to 75%, a glass transition temperature from 0.degree. to -25.degree. C., a number average molecular weight of 200,000 and higher and an inhomogeneity U of less than 1.8. Motor vehicle tires can be prepared in an advantageous manner with these rubber mixtures.

Abstract: The invention relates to a radial tire in which each sidewall covering and protecting the side face of the carcass is composed of a plurality of layers differing in rubber composition. In the radial tire according to the invention, the sidewall has a three-layer structure consisting of an adjesive layer adjacent to the carcass, an inner layer disposed outwardly thereon and an outer layer disposed further outwardly thereon. The rubber components in the rubber compositions respectively constituting the three layers differ in proportions of the rubber having as low degree of unsaturation and the rubber having a high degree of unsaturation and the high-unsaturation rubber content decreases in the order of adhesive layer, inner layer and out layer. While retaining the endurance characteristics and ozone resistance of the conventional tires, the radial tire according to the invention is improved in that its good appearance can be prevented from being spoiled by staining or discoloration of its side portions.

Abstract: A pneumatic tire with a tread composed of a blend of 3,4-polyisoprene rubber, cis 1,4 polyisoprene rubber and at least one additional diene based rubber.

Abstract: Pneumatic rubber tire with a rubber tread composition of styrene/butadiene copolymer rubber, cis 1,4-polyisoprene rubber and cis 1,4-polybutadiene rubber with a required glass transition temperature differentiation between the rubbers.

Abstract: A dynamically vulcanized alloy composition having improved tensile strength including a first butyl or halogenated butyl rubber-base elastomer and a second EPM and/or EPDM elastomer in a matrix of a crystalline polyolefinic resin, and processes for producing the improved composition.

Abstract: Butadiene polymer rubber compositions containing a polymeric activator have particularly beneficial characteristics. The activator is an interpolymer of a vinylpyridine monomer and a diene hydrocarbon monomer which interpolymer contains from 20% to 65% by weight of vinylpyridine units. Composite articles made from these rubber compositions together with contiguous portions of a dissimilar rubber compound show greater strength and adhesion as a result of the presence of a activator in the butadiene polymer rubber composition.

Abstract: The present invention relates to an elastomeric composition suitable for tire treads comprising 1) 10-90% wt of a copolymr of a mono-aromatic vinyl compound and a conjugated diene having a vinyl content of .gtoreq.50% wt and a Tg >-35 degree C, and 2) 90-10% wt of a homopolymer of a conjugated diene or a copolymer of a mono-aromatic vinyl compound and a conjugated diene, containing <25% wt of mono-aromatic vinyl compound and having a vinyl content <25% wt and a Tg <-55 degree C, both polymers having a differential content of mono-aromatic vinyl compound which is <5 percentage points.

Abstract: An unsaturated elastomeric, asymmetrically coupled block copolymer of the formula: (A).sub.n -X-(B).sub.m, wherein block A is a block of polybutadiene having a content of uniformly distributed vinyl groups ranging from 8 to 60% and block (B) is a homopolymer of isoprene or a copolymer of at least 10% isoprene with 0 to 60% butadiene and up to 45% styrene, the copolymer having a vinyl unit content of 75 to 90%, X is a radical of a coupling agent and (m-n).gtoreq.0 and (m+n) ranges from 3 to 25.

Abstract: Tires having white sidewalls are very popular in the United States and Canada. Tires having white lettering thereon are also very popular. This invention discloses a process for preparing such tires having decorative appliques thereon. By practicing the process of this invention, tires having better uniformity can be built at lower costs than when standard tire building techniques are utilized. This invention specifically relates to a method of preparing a pneumatic rubber tire having a decorative design on the sidewall thereof which comprises (a) applying the decorative applique to the sidewall of an uncured tire and (b) curing the tire; wherein the decorative applique is comprised of from about 25 weight percent to about 75 weight percent syndiotactic 1,2-polybutadiene having a melting point which is within the range of about 70.degree. C. to about 160.degree. C.

Abstract: A processing aid for a thermoplastic resin is disclosed, which is a two-stage polymer obtained by polymerizing (B) 5 to 50 parts by weight of a monomer or monomer mixture composed mainly of methyl methacrylate in the presence of (A) 50 to 95 parts by weight of a polymer comprising 100 to 50% by weight of units of a methacrylic acid ester other than methyl methacrylate and 0 to 50% by weight of units of other monomer copolymerizable with the methacrylic acid ester and having a reduced viscosity .eta.sp/C not larger than 2.0 dl/g, so that the total amount of the components (A) and (B) is 100 parts by weight and the reduced viscosity .eta.sp of the final polymer is not larger than 2.0 dl/g. A thermoplastic resin having the processing aid incorporated therein has an improved shaping processability, and a shaped article mode therefrom has good surface characteristics.

Abstract: An unsaturated elastomeric AB block copolymer comprising 20-75 wt. % 1,3-butadiene monomer units; 5-50 wt. % isoprene monomer units; and 3-30% wt. % styrene monomer units; wherein said block copolymer contains less than 3 wt. % styrene blocks, each of said block A and block B contain all three of said monomer units, said copolymer comprises 30-90 wt. % of block A and 70-10 wt. % of block B, and wherein the average vinyl and isopropenyl content of block B are each at least 30% higher than those of block A; and a method for preparing the unsaturated AB block copolymer.

Abstract: Tires having white sidewalls are very popular in the United States and Canada. This invention discloses a process for preparing such tires having decorative appliques thereon. By practicing the process of this invention, tires having better uniformity can be built at lower costs than when standard tire building techniques are utilized. This invention specifically relates to a method of preparing a pneumatic rubber tire having a decorative applique on the sidewall thereof which comprises (a) applying the decorative applique to the sidewall of a cured tire and (b) binding the decorative applique to the sidewall by the application of heat and pressure; wherein the decorative applique is comprised of from about 25 weight percent to about 75 weight percent syndiotactic 1,2-polybutadiene or blends of SPBD having melting points which are within the range of about 70.degree. C. to about 160.degree. C.

Abstract: A styrene, isoprene, butadiene terpolymer rubber with a characterization according to its glass transition temperatures and unit structure and a pneumatic tire with a tread composed of such terpolymer rubber specifically in combination with selected other rubber which has been observed to provide such tread with enhanced physical properties.

Abstract: Natural rubber latex compounds are modified by the addition of a high styrene content styrene-butadiene copolymer. The films prepared from these modified NR latex compositions exhibit improved tear strength and a good balance of other properties.

Abstract: In a thread-wound golf ball comprising a thread-wound core and a cover, the cover is formed of a vulcanized rubber composition comprising a base rubber containing at least 30% by weight of transpolyisoprene and has a vulcanizing sulfur content ratio between radially outer and inner half regions of from 1/2 to 4/1. Sufficient vulcanizing sulfur available throughout the cover renders the cover to be resistant to cut and shear so that the ball becomes durable.

Abstract: The present invention relates to an elastomeric composition suitable for tire treads comprising (1) 10-90% wt of a copolymer of a mono-aromatic vinyl compound and having a vinyl content of <50% wt and a Tg<-35 degree C., and (2) 90-10% wt of a hompolymer of a conjugated diene or a copolymer of a mono-aromatic vinyl compound and a conjugated diene, containing <25% wt of mono-aromatic vinyl compound and having a vinyl content <25% wt and a Tg<-55 degree C., both polymer having a differential content of mono-aromatic vinyl compound which is <5 percentage points.

Abstract: Blends are disclosed of monoolefin rubber with high-diene hydrocarbon rubber in which the monoolefin rubber is in the form of discrete vulcanized particles dispersed in a matrix of unvulcanized high-diene hydrocarbon rubber. The blends can be easily processed, and in a subsequent step, the high-diene hydrocarbon portion cured to give rubber articles having the ozone resistance of the monoolefin rubber and the good physical properties of the high-diene hydrocarbon rubber.

Abstract: A rubber composition useful for high performance tires comprises 10-200 parts by weight of a particular low molecular weight diene series hydrogenated polymer based on 100 parts by weight of a particular high molecular weight diene series hydrogenated polymer.

Abstract: Rubber compositions for tire treads of an all-weather type are disclosed which are so designed as to exhibit high dynamic Young's modulus, sufficient resistance to snow and ice skidding, to abrasion, to cracking and to crack growth and adequate durability. A selected base rubber is combined with a selected carbon black and a selected m-cresol resin. The base rubber is a blend of two different rubbers, one being natural rubber alone or a combination with a diene rubber and the other being butadiene rubber. The carbon black has specified absorptivity of iodine and dibutyl phthalate. The m-cresol resin is a novolak condensate.

Abstract: This invention relates to mixtures of polychloroprene elastomers which are distinguished by their good processibility and excellent cold resistance.

Abstract: The wear resistance of the pneumatic tire used under a high severity region is improved by using a particular high-trans polybutadiene rubber in a rubber composition for a ground contact part of the tire tread.

Abstract: A rubber composition is disclosed which contains not less than 20% by weight in a rubber component of a block copolymer composed of polymer or copolymer block units (A) and a random copolymer block units (B). The polymer or copolymer block units (A) are obtained by singly polymerizing a conjugated diolefine or copolymerizing the conjugated diolefine and a monovinyl aromatic hydrocarbon with use of a lithium initiator and contains not more than 10% by weight of the bound monovinyl aromatic hydrocarbon. The random copolymer block unit (B) are obtained by copolymerizing the conjugated diolefine and the monovinyl aromatic hydrocarbon and contain 15 to 80% by weight of the bound monovinyl aromatic hydrocarbon.

Abstract: A pneumatic tire with tread composed of a sulfur cured rubber comprised of, based on the rubber (A) cis 1,4-polyisoprene; (B) at least one of isoprene/acrylonitrile rubber and butadiene/acrylonitrile rubber and, optionally; (C) at least one additional rubber which includes cis 1,4-polybutadiene characterized in that the cis 1,4-polybutadiene is a primary rubber constituent.

Abstract: A rubber-modified styrene resin composition is disclosed, in which a soft component comprising an elastomer is dispersed in a resin matrix comprising a styrene resin in the form of particles, wherein:(1) the soft component particles dispersed in the composition have an average particle size of from 0.2 to 2.6 .mu.m;(2) the soft component has such a particle size distribution as having two maxima, one in the range less than 0.8 .mu.m and the other in the range not less than 0.8 .mu.m;(3) the elastomer is present in an amount of from 5.0 to 10.0% by weight based on the resin composition; and(4) the resin matrix has an intrinsic viscosity [.eta.] of at least 0.65.The resin composition exhibits markedly improved impact strength, stiffness and gloss.

Abstract: A degradable polymer composition is disclosed which comprises a blend of a normally stable chemically saturated polymer, such as polyethylene, a less stable chemically unsaturated polymer or copolymer, such as a styrene/butadiene block copolymer, or natural rubber, an antioxidant active over a limited period and a latent pro-oxidant, such as an organic salt of a transition metal, e.g. cobalt naphthenate. The presence together of the anti-oxidant and the pro-oxidant give rise to a period of induction before a sharp loss of physical strength occurs, whereby the period of induction can be exploited as the effective working life of the polymer composition.

Abstract: Butadiene polymer rubber compositions containing a polymeric activator have particularly beneficial characteristics. The activator is an interpolymer of a vinylpyridine monomer and a diene hydrocarbon monomer which interpolymer contains from 20% to 65% by weight of vinylpyridiene units. Composite articles made from these rubber compositions together with contiguous portions of a dissimilar rubber compound show greater strength and adhesion as a result of the presence of a activator in the butadiene polymer rubber composition.

Abstract: Tires having a sidewall composed of a composition formed by curing a blend comprised of (A) high molecular weight (6.times.10.sup.5 Mu) ethylene/alphaolefin/nonconjugated polyene terpolymer; (B) a highly unsaturated rubber; and (C) a curative system comprised of sulfur and/or a sulfur-donor compound, an organic(hydro)peroxide curative and a sulfur cure accelerator exhibit desirable reduced internal heat buildup and improved adhesion to adjacent rubber carcass and tread portions of the tire.

Abstract: Tires having white sidewalls are very popular in the United States and Canada. Tires having white lettering thereon are also very popular. This invention discloses a process for preparing such tires having decorative appliques thereon. By practicing the process of this invention, tires having better uniformity can be built at lower costs than when standard tire building techniques are utilized. This invention specifically relates to a method of preparing a pneumatic rubber tire having a decorative design on the sidewall thereof which comprises (a) applying the decorative design to the sidewall of an uncured tire and (b) curing the tire; wherein the decorative design is comprised of from about 25 weight percent to about 75 weight percent syndiotactic 1,2-polybutadiene having a melting point which is within the range of about 100.degree. C. to about 160.degree. C.

Abstract: Natural rubber latex compounds are modified by the addition of a high styrene content styrene-butadiene copolymer. The films prepared from these modified NR latex compositions exhibit improved tear strength and a good balance of other properties.

Abstract: A pneumatic tire comprises a tread portion comprised of a rubber composition consisting of a particular rubber blend and a particular carbon black and having specified rubber properties as a vulcanizate, and has highly improved all-weather type running performances and excellent wear resistance.

Abstract: Thermoplastic compositions of matter useful as gasketing materials as well as flexible boots and seals which are soft, have low compression set and high tensile. The compositions comprise a polyolefin resin and at least two different rubbers, one of which is vulcanized to a fully cured state by a cure system which leaves the other rubber(s) unvulcanized. The preferred embodiment comprises a blend of polypropylene and ethylene vinylacetate as the polyolefin resin component, EPDM as the uncured rubber component and a ZnO cured halogenated butyl rubber. In another embodiment of the invention, the resin is excluded and the uncured rubber is a high crystallinity EPDM.

Abstract: Blends comprised of (A) a high molecular weight elastomeric polymer; (B) a sufficient amount of an ethylene/alphaolefin/nonconjugated polyene terpolymer having a number average molecular weight of between about 1,000 and about 15,000 such that the variety of the blend is at least about 5% lower than the viscosity of component (A) alone, and (c) a curative, exhibit increased processability, and, when cured, exhibit unexpectedly desirable tensile strength, ozone resistance and oil resistance.

Abstract: A package comprised of (A) compounding ingredients for unvulcanized rubber packaged in (B) a film comprised of syndiotactic-1,2-polybutadiene, sulfur, accelerator and retarder. The invention further relates to a compounded rubber comprised of a mixture of such package and sulfur curable rubber. The film may also contain additional selected rubbers.

Abstract: To provide a selective and repetitive junction system by adhesion of separate parts an adhesive element is suggested which is capable of being jointed only with another identical or similar element, which comprises a carrier and an adhesive layer on at least one side of the carrier, said layer being composed by an elastomeric material firmly anchored to the carrier. The layer is preferably rather thin and smooth.

Abstract: The present invention provides a rubber composition which comprises 100 parts by weight of ethylene.multidot..alpha.-olefin.multidot.non-conjugated diene copolymer rubber, 5-40 parts by weight of solid diene rubber and 4-15 parts by weight of sulfur, the butadiene content of said solid diene rubber being 50% by weight or more, the butadiene portions of said solid diene rubber having 40% or more of 1,2 bonds based on all the bonds of said portion, and the ratio of weight-average molecular weight to number-average molecular weight being 2 or less. The rubber composition is a vulcanized rubber excellent in properties such as hardness and strength.

Abstract: A rubber composition which gives a rubber vibration insulator having excellent low-temperature properties comprises as a main rubber component a blend composed of (a) 10 to 90 parts by weight of a tapered styrene/butadiene copolymer rubber which has an average bound styrene content of 10 to 40% by weight and a 1,2-bond content in the butadiene portion of at least 50% by weight and in which the bound styrene content increases or decreases in one direction along the copolymer molecular chain and (b) 90 to 10 parts by weight of natural rubber and/or synthetic polyisoprene rubber.

Abstract: There are disclosed copolymers of aromatic vinyl compounds, e.g., styrene, and conjugated diolefins, e.g., butadiene, possessing a differential content of the aromatic vinyl compound such that in at least one of the end portions of the copolymer the differential content shows a sharp and substantial increase in the direction of the outer extremity of the end portion. Preferred compolymers are styrene-butadiene copolymers having a vinyl content of at least 30%. In special embodiments, the copolymer have a styrene content changing in a portion of no more than 5% of the copolymer chain from a first value to a second value, the second value being at least 25 percentage points greater than the first value, and the portion is present within a 10% terminal portion of the copolymer. The copolymers are useful in the tread portions of tires as tires containing such copolymers in the tread composition have improved rolling resistance and/or grip on wet road surfaces.

Abstract: Novel system for providing anti-corrosion protective coatings, e.g. for metal pipes and the like, comprising: (1) a rubber-based primer coating mixture; and (2) an adhesive tape comprising a backing carrying a rubber-based adhesive coating comprising a mixture of pre-crosslinked butyl rubber and virgin butyl rubber alone or in combination with reclaimed butyl rubber, the system further including a crosslinking agent and a crosslinking activator adapted to provide an incipient or in situ crosslinking of the system after the primer coating and tape are applied.Preferably, the crosslinking agent is contained initially in the adhesive coating; and the activator is contained initially in the primer.

Abstract: A high-hardness rubber composition which is obtained by vulcanizing an unvulcanized rubber composition comprisingan unvulcanized ethylene..alpha.-olefin rubber composition (A) comprising 100 parts by weight of an ethylene..alpha.-olefin copolymer rubber, 60-150 parts by weight of a reinforcing agent and 0-70 parts by weight of a softener;5-40 parts by weight of a solid diene rubber (B) based on 100 parts by weight of said ethylene..alpha.-olefin copolymer rubber; and4-15 parts by weight of sulfur (C) based on 100 parts by weight of said ethylene..alpha.-olefin copolymer rubber,wherein said unvulcanized rubber composition is obtained by adding said solid diene rubber (B) and said sulfur (C) to said unvulcanized ethylene..alpha.-olefin rubber composition (A).

Abstract: A tire tread rubber composition having a two-peak tan.delta. characterized in that the temperature distribution curve for loss tangent (tan.delta.) has two peaks in the range from -120.degree. C. to +100.degree. C. is useful as a tire tread rubber composition.

Abstract: Rubber compositions for tire treads well balanced in the performances of rolling registance, sliding coefficient of friction on wet road surfaces and wear resistance and which are superior in the processability and workability, including at least 20 parts by weight of styrene-butadiene random copolymer prepared by using an organic lithium as a polymerization catalyst and coupled with a mono- or difunctional tin compound as well as a tri- or more functional compound and having a tin content of 300 ppm or more which is bonded to the polymer and further include a carbon black having the value of N.sub.2 SA/IA of 1.1 or more.

Abstract: An elastomeric composition suitable for tires comprising(A) 5 to 50% by weight of copolymer block (A) of an aromatic vinyl compound and a conjugated diene and containing 52-90% wt of vinyl compound and having an average mol. wt. >20,000 and a vinyl content in the diene units of <20% wt, and(B) 95-50% by weight of a block (B) which is a homopolymer of a conjugated diene or a copolymer block of an aromatic vinyl compound and a conjugated diene, block (B) containing <20% wt. of aromatic vinyl compound and having a Tg <-40.degree..degree.C.,after vulcanization blocks (A) and (B) being incompatible.

Abstract: Thermoplastic moulding materials, of vinyl chloride polymers, which contain a polymer, prepared in the presence of mercaptans, from styrene, .alpha.-methylstyrene, vinyltoluene, acrylonitrile, methyl methacrylate or mixtures thereof and which possess improved processing properties.

Abstract: NR/EPDM co-cured rubber blends with sulfur and organic peroxide used together as the co-curing agents to achieve ozone resistant, high tensile property rubber compositions. Sulfur accelerators MBTS and DPG are also employed in the curing process. NR/EPDM blends of from 70/30 to 55/45 are cured in an air cure process with sulfur in the range of 0.64-1.6 phr and with organic peroxide in the range of 0.6-1.6 phr.

Abstract: There is disclosed an improved method for open steam curing of mineral-loaded elastomers. It has been discovered that use of a vulcanization agent comprising a mixture of an alkyl phenol disulfide and a guanidine compound provides a synergistic curing system that is superior over the use of either component alone. The improved curing system of the present invention is particularly suited for the open steam curing of mineral-loaded chlorobutyl compounds. The cure system may be used in addition to zinc oxide and results in excellent states of cure as determined by tensile elongation and hardness measurements.

Abstract: A rubber composition for a solid golf ball comprising a rubber component containing at least 40% by weight of a polybutadiene rubber which has a Mooney viscosity [ML.sub.1+4 (100.degree. C.)] of 45 to 90 and a cis-1,4 bond of at least 80%, a co-crosslinking agent and a peroxide.