Abstract: The invention relates to a sulfur curable (and cured) rubber composition which contains one or more pentaerythritol derivatives as pentaerythritol tetrabenzoate (PTB) and/or pentaerythritol tetrakis (3,5-di-tert-butyl-4-hydroxyhydrocinnamate) (PTHC) together with a low molecular weight polyester sebacate. Such combination of materials has been observed to increase resistance to tear for a rubber composition. The invention particularly relates to a tire having a component comprised of such rubber composition.

Abstract: The invention relates to a tire with rubber tread of cap/base construction. The tread base underlies the tread cap. The tread base is relatively thick, namely at least 50 percent of the thickness of the tread cap. It is desired that the tread base rubber composition contains a significant amount of sulfur to enhance physical properties of the tread base. The tread base rubber composition contains a combination of anti-reversion agents to counteract a tendency for reversion of physical properties of the tread base which is relatively thick as compared to the tread cap. The combination of anti-reversion co-agents is 1,3-bis-(citraconimidomethyl)benzene and hexamethylene 1,6-bis(thiosulfate), disodium salt, dehydrate thereby substantially maintaining the integrity of physical properties of the tread base, reduced tire operating temperature, as well as retarded or eliminated groove cracking in the tread cap has been observed.

Abstract: This invention relates to tires which have a rubber insert within the tire sidewall of a rubber composition which contains at least one of N,N′-(m-phenylene) bis citraconamic acid and N,N′-(m-xylylene) bis citraconamic acid. Such rubber insert is preferably of a stiff rubber composition which helps to support the weight of the vehicle to which the tire is mounted in situations where there is a loss of air pressure within the tire cavity. During periods of operation after loss of air pressure, the rubber insert is intended to aid in supporting a significant amount of the load assumed by the tire which leads to an internal generation of heat with the insert rubber composition, with an accompanying rise of temperature of the insert itself It is therefore important that the rubber composition of such rubber insert have a high degree of heat durability under conditions of working at the elevated temperature.

Abstract: This invention relates to a conjugated diene-based rubber composition reinforced with silica-based reinforcement together with a non-silane coupling agent as N-3-(1,2-dihydroxypropyl)-N-oleylammonium bromide and/or N-3-(1,2-dihydroxypropyl)-N-methyl-2-mercaptoimidazolium bromide for endeavoring to both couple synthetic aggregates of precipitated silica to elastomers and enhancing electrical conductivity of such rubber compositions which contain less than 25 parts by weight carbon black per 100 parts by weight elastomer. Said coupling agent materials may be provided for mixing with said diene-based rubber(s), for example, as individual materials, as at least one of said materials being supported on a carbon black carrier or as being pre-reacted, or otherwise pre-treated, with synthetic silica aggregates. The invention includes an article of manufacture, including a tire, having at least one component comprised of such rubber composition.

Abstract: There is disclosed a rubber composition particularly suited for use in tires. The rubber composition is composed of 100 parts by weight of at least one rubber containing olefinic unsaturation; and from 1 to 150 parts per 100 parts by weight of rubber, of a silica having predispersed on the surface of the silica a liquid epoxidized butadiene polymer having a number average molecular weight of from 500 to 10,000.

Abstract: There is provided a rubber composition for breaker cushion excellent in elongation at break strength at break after aging with maintaining control stability, and a truck and bus tire using the rubber composition. A rubber composition for breaker cushion comprises 1,3-bis(citraconimidomethyl)benzene and 25 to 35 parts by weight of carbon black having a nitrogen adsorption specific surface area of 70 to 120 cm2/g based on 100 parts by weight of a rubber component.

Abstract: The subject invention is based upon the unexpected discovery that tires having outstanding dry and wet traction characteristics, including wet skid resistance, can be made by incorporating certain blends of styrene-butadiene rubber (SBR) and isoprene-butadiene rubber (IBR) into the treads thereof without greatly sacrificing rolling resistance and tread wear characteristics.

Abstract: A process for producing tires for vehicle wheels includes making a raw tire including at least one crosslinkable elastomeric material, molding the raw tire in a molding cavity defined in a vulcanization mold, and crosslinking the elastomeric material by heating the tire to a predetermined temperature for a predetermined time, wherein the raw tire includes at least one crosslinkable elastomeric material having an elastomeric polymer containing epoxide groups and an active filler containing hydroxyl groups dispersed in the elastomeric polymer, and wherein the crosslinking step is carried out essentially without additional crosslinking agents. A related composition, process for producing the composition, manufactured product, and tire are also disclosed.

Abstract: The present application relates to polymeric resinous material comprising (1) from 5 to 70 weight percent units derived from limonene; (2) from 5 to 70 weight percent units derived from dicyclopentadiene; (3) from 5 to 45 weight percent units derived from indene; and (4) from 5 to 45 weight percent units derived from tertiary-butyl styrene; wherein the sum of the weight percent units derived from limonene and dicyclopentadiene range from 40 to 75 weight percent units of the resin and the sum of the weight percent units derived from indene and tertiary-butyl styrene range from 25 to 60 weight percent units of the resin.

Abstract: A rubber composition comprising (A) at least one natural or synthetic diene rubber, (B) an inorganic filler comprising at least one of silica and silicates as the main component and (C) an addition salt of an amine represented by general formula (I): wherein R1 represents a C8 to C24 alkyl group, an aryl group or an aralkyl group, R2 and R3 represent a hydrogen atom, a C1 to C12 alkyl group, an aryl group, an aralkyl group or a hydroxyalkyl group and R4 represents a C6 to C24 alkyl or alkenyl group, an aryl group or an aralkyl group; and a pneumatic tire produced by using the rubber composition.

Abstract: The invention relates to the preparation of a rubber composition containing silica-based filler reinforcement through the utilization of a organosilane disulfide compound mixed with a rubber composition in at least one preparatory, non-productive, mixing stage followed by utilization of an organosilane polysulfide compound mixed with the rubber composition in a subsequent, productive, mixing stage. The invention further relates to the resulting rubber composition and use thereof in tires.

Abstract: The present invention relates to rubber compounds comprising one or more soluble rubbers, hydrophobized filler, and one or more sulfane-silane compounds on an inorganic or organic support and to a process for making them. The novel rubber compounds are suitable for moldings of every kind, especially tires or tire treads having low rolling resistance and high resistance to abrasion.

Abstract: The invention provides solid supported anionic catalysts, suitable for gas phase anionic polymerization of conjugated diene monomers, that are useful for anionically producing very high molecular weight branched diene polymers, such as styrene butadiene rubber, polybutadiene rubber, polyisoprene rubber, and the like. The catalysts comprise a metalatable particle, such as a bound rubber, a thermoplastic polymer or a cured elastomer, that is multiply metalated with Group IA alkali metal atoms. The multi-branched diene polymers obtained by gas phase anionic polymerization employing the catalysts exhibit desirable properties, such as an extremely high molecular weight, a controlled molecular weight distribution, Tg and vinyl content, and the ability to readily absorb hydrocarbon solvents and oils. The polymers are easily compounded to form vulcanizable elastomeric compounds and articles, such as tires, that have excellent resistance to wear and tear and exhibit reduced hysteresis properties.

Abstract: There is disclosed a rubber composition for a tire tread Which comprises 100 parts by weight of (A) a rubber component comprising a diene-based synthetic rubber or a mixture of a diene-based synthetic rubber and natural rubber and containing at least 20% by weight of a styrene-butadiene rubber; 5 to 50 parts by weight of (B) aluminum hydroxide powders; and at least 5 parts by weight of (C) silica powders, wherein the total amount of the components (B) and (C) is in the range of 40 to 80 parts by weight; and optionally chemical agents such as vulcanizing agents, vulcanization accelerators and antioxidants, and also is disclosed a pneumatic tire in which the above rubber composition is used as the tread rubber. The above rubber composition, when made into a tire tread, can maintain favorable low fuel consumption properties and low wear resistance, and besides can impart the tire with greatly improved gripping properties on wet road surfaces particularly at a low temperature.

Abstract: This invention relates to a rubber composition composed of high Tg diene-based elastomers and which contains a high Tg liquid polymer of high vinyl polybutadiene and to such a composition being sulfur cured. The invention also relates to a tire having a tread of such rubber composition.

Abstract: New carbon blacks that when incorporated into rubber compositions impart increased abrasion resistance and lower hysteresis. Also disclosed are rubber composition incorporating the novel carbon blacks, which have nitrogen surface area of at least 100, a CDBP of at least 105, a tint of 90-140 and a delta D50/Dmode ratio of 0.6-0.76.

Abstract: The invention relates to a rubber composition containing relatively low levels of carbon black and/or silica reinforcement together with a particulate calcium carbonate and selected modifiers. The invention particularly relates to a tire having a component, particularly a tread, of such composition.

Abstract: The present invention relates to rubber compositions containing borate compounds of the formula wherein R1 and R2 are independently selected from the group consisting of alkoxy radicals having from 1 to 8 carbon atoms; R3 is selected from the group consisting of alkylene groups having from 1 to 15 carbon atoms and arylene and alkyl substituted arylene groups having from 6 to 10 carbon atoms; X is selected from the group consisting of and Y is selected from the group consisting of Sx and Sex where x is an integer of from 1 to 8.

Abstract: There is disclosed a pneumatic tire for heavy duty use having a tread which is composed of a rubber composition comprising 100 parts by weight of an (A) isoprene-based rubber and 30 to 70 parts by weight of (B) carbon black which has a nitrogen-adsorption specific surface area (BET) of 120 to 160 m2/g; a dibutyl phthalate absorption amount (DBP) of 80 to 130 ml/100 g; a most frequent value of aggregate diameter distribution (Dst) of 60 to 70 nm; and a half peak width (&Dgr;D50) of 65 to 80 nm, and as the case may be, 3 to 20 parts by weight of (C) silica which has a nitrogen-adsorption specific surface area (BET) of 210 to 260 m2/g; and an oil absorption amount of 200 to 260 ml/100 g. The above pneumatic tire is capable of enhancing the low heat-buildup property without detriment to the abrasion resistance of a tread rubber, and favorably reconciling both the low heat-buildup property and the abrasion resistance of itself.

Abstract: The invention relates to a rubber composition containing a modified silanol-containing carbon black reinforcement which has a grafted hydrocarbon on its surface. The invention also relates to an article such as, for example, a tire having at least one component of such rubber composition.

Abstract: Aluminum hydroxide is disclosed, wherein a mean particle size of a secondary particle is from 0.1 to 8 .mu.m, a BET specific surface area is not less than about 30 m.sup.2 /g and a pore size distribution has a maximum value within the range from 5 to 100 nm, a method for producing the same, and a method of using the same, comprising containing the same in a rubber, a method for using the same as a filler of a rubber composition for tire tread, and a rubber composition for tire tread using the same.

Abstract: A silica-blended rubber composition comprising 100 parts by weight of sulfur-vulcanizable rubber blended with 10 to 100 parts by weight of silica, 3 to 20% by weight of a silane coupling agent based on the silica and 1 to 20% by weight of sodium borate based on the silica. An alkoxy group-containing silane coupling agent is preferred as the silane coupling agent, and sodium tetraborate is preferred as the sodium borate.

Abstract: A pneumatic tire comprising a tread which contacts a road surface and comprises a rubber composition which contains a rubber component composed of 70% by weight or more of a copolymer of a conjugated diene and a vinyl aromatic hydrocarbon and a remaining amount of another synthetic rubber and/or natural rubber, at least one reinforcing filler selected from a group consisting of carbon black and silica, and at least one type of vulcanization accelerator, such as bis(4-methylbenzothiazolyl-2)-disulfide, bis(5-methylbenzothiazolyl-2)-dis ulfide, mercapto-4-methylbenzothiazole, and mercapto-5-methylbenzothiazole, an amount of the reinforcing filler being 45 to 120 parts by weight and an amount of the vulcanization accelerator being 0.5 to 5.0 parts by weight per 100 parts by weight of the rubber component. Decrease in chipping resistance during tire use is suppressed, and both abrasion resistance and controllability on wet roads after use of the tire are improved.

Abstract: A tire is described which has a tread pattern provided with a large central channel (2) interposed between two continuous circumferential ribs (8), and a pair of large circumferential grooves (4) located at symmetrically opposite positions relative to the central channel (2). Also provided are transverse grooves (3) having a symmetrically converging inclined extension, the axial inclination of which increasingly grows larger towards the central channel (2). The longitudinal grooves (4) each consist of a sequence of oblique portions (4a) giving the grooves a broken-line course, so that each land portion or block (5, 6) delimited by the grooves (3, 4) has a corner (5a, 6a) projecting inwardly of the corresponding circumferential groove (4) with respect to the opposite corner (5b, 6b) of the circumferentially adjacent block.

Abstract: This invention relates to a rubber composition and to a tire with tread of rubber composition prepared with filler reinforcement, a majority of which is silica reinforcement, together with a silica coupling agent, and a minority is carbon black and conventional rubber compounding ingredients wherein at least one of said compounding ingredients and/or coupling agent is liquid and is provided as being deposited on a specified carbon black carrier. In particular, the carbon black carrier is characterized by having a DBP value in a range of about 280 to about 600 cm.sup.3 /100 g and a BET value in a range of about 550 to about 1200 m.sup.2 /g. The selection of the said carbon black carrier is intended to reduce the electrical volume resistivity of the tread composition.

Abstract: The invention relates to a tire with a tread which is reinforced with a quantitative amount of silica, including a silica coupler, where the tread rubbers are of a blend comprised of styrene/isoprene/butadiene terpolymer rubber and cis 1,4-polybutadiene rubber or styrene/isoprene/butadiene terpolymer rubber, cis 1,4-polybutadiene rubber and isoprene/butadiene copolymer rubber. Optionally, the rubber blend can contain a minor amount of cis 1,4-polyisoprene natural rubber.