Abstract: Pneumatic rubber tire having at least one component or a rubber composition comprised of a major portion of relatively low Tg high cis 1,4-polybutadiene elastomer (BR) and a minor portion of a relatively high Tg, styrene-rich, styrene/isoprene elastomer (SIR) wherein the Tg of said BR is at least 60° C. lower than the Tg of said SIR. Said SIR has a styrene content of at least 30 weight percent. The styrene based units of said SIR are present substantially without large blocks of styrene units. Said BR is a high cis 1,4-polybutadiene having a cis 1,4-content of at least 96 percent and preferably has a branched macrostructure. In one aspect of the invention, said tire component is a tire tread, particularly a circumferential tire tread.

Abstract: The invention relates to a process for the preparation of an aqueous dispersion of halogenated vinyl polymers by polymerization, according to which, after polymerization, a basic agent is added in an amount such that the pH of the aqueous dispersion is less than approximately 5. The invention also relates to the aqueous dispersion obtained, which can be coated onto polymeric substrates made of paper or of regenerated cellulose.

Abstract: A sound insulating composite material contains (a) a crosslinked polymer containing 100 parts by weight of an ethylene-propylene rubber, 20-100 parts by weight of a polyethylene, and 100-200 parts by weight of a polypropylene; and (b) an inorganic filler in an amount of 200-500 parts by weight relative to 100 parts by weight of the ethylene-propylene rubber. The crosslinked polymer is prepared by a dynamic crosslinking of the ethylene-propylene rubber with the polyethylene and the polypropylene in the presence of an organic peroxide. The sound insulating composite material can be produced by (a) preparing a mixture containing the ethylene-propylene rubber, the polyethylene, the polypropylene, and the organic peroxide; and (b) kneading the mixture while the mixture is in a melted condition, thereby generating the dynamic crosslinking.

Abstract: This invention relates to preparation of a rubber composition by pre-mixing at least one functionalized carbon black with an organic solvent solution or aqueous emulsion of at least one host elastomer. Functionalized carbon blacks for the purposes of this invention preferably contain a functional moiety on their surface to aid in promoting covalent bonds between the functionalized carbon black and said host polymer. The invention also contemplates the use of such rubber composition, or blend of such rubber composition with at least one additional elastomer and/or rubber compounding ingredient, as a component of an article of manufacture. Such article of manufacture may be, for example, a tire. Such article may also be an industrial product such as, for example, a hose or belt such as a conveyor belt or power transmission belt.

Abstract: A rubber composition for a solid golf ball contains a polybutadiene rubber component, a co-crosslinking agent, an organic peroxide, a filler, and an organic sulfur compound. When a core for a solid golf ball is formed by using the rubber composition for a solid golf ball, the content of a trans-structure in a cross-linked polybutadiene rubber component on the surface of the core is in a range of 20 to 39%, and a value obtained by subtracting the content of the trans-structure in the cross-linked polybutadiene rubber component at the center of the core from the content of the trans-structure in the cross-linked polybutadiene rubber component on the surface of the core is in a range of 5 to 35%. A solid golf ball produced by using such a core is excellent in hit feeling and flight characteristics. A method of producing a core for a solid golf ball makes it possible to simply produce the core specified as described above.

Abstract: The invention relates to a process for the preparation of an aqueous dispersion of halogenated vinyl polymers by polymerization, according to which, after polymerization, a basic agent is added in an amount such that the pH of the aqueous dispersion is less than approximately 5. The invention also relates to the aqueous dispersion obtained, which can be coated onto polymeric substrates made of paper or of regenerated cellulose.

Abstract: The invention aims at providing a rubber composition for adhering to steel cords which is excellent in heat-resistant adhesion and moist heat-resistant adhesion as well as initial adhesion and has performance of a level similar to or higher than that of the related art in resistance to rubber fracture, wherein the following components (A) and (B) are blended to 100 weight parts of rubber components containing natural rubber and/or diene synthetic rubber:

Abstract: The present invention provides a method of vulcanized bonding of heat resistant rubber. Vulcanized bonding of a hydrogenated acrylonitrile butadiene rubber (H-NBR) and an acrylic rubber (ACM) comprises a step for mixing zinc oxide (ZnO) and magnesium oxide (MgO) as acid acceptors into non-vulcanized H-NBR; and a step for the peroxide vulcanization of the H-NBR at the same time as the vulcanized bonding of the ACM, which is of an epoxy cross-linking type. Thus, hydrogenated acrylonitrile butadiene rubber (H-NBR) and acrylic rubber (ACM) are vulcanized bonded securely while also providing heat resistance.

Abstract: A pneumatic rubber tire is provided having inner and outer air retention quasi envelopes which individually substantially envelop the tire air chamber and which are comprised of a first inner quasi envelope as an integral innerliner and a second outer quasi envelope as a combination of sidewalls and tread. Such pneumatic tire is of a relatively conventional open toroidal shape. The innerliner and the sidewall-tread combination are termed as being quasi envelopes in a sense that a rigid rim, onto which the tire is to be mounted and inflated, is used to complete the closure of the tire's air chamber envelope.

Abstract: The present invention relates to a method for evaluating the crosslink degree of a vulcanized sample in real time during a vulcanization process or diagnosing the electrical properties of the sample after the completion of the vulcanization process, and then determining an optimal vulcanization time and an optimal content of each constituent gradient of a composition for vulcanization that optimize the properties of the composition according to the vulcanization conditions, for the sake of improving the properties of the vulcanized sample prepared from a polymer by vulcanization at a high temperature.

Abstract: The present invention provides a curable polyphenylene ether (PPE) resin, a composition made therefrom, and a process for preparing the resin. The process involves introducing a vinyl group-containing functional group to the terminal end of PPE by modifying the hydroxy and ester groups on the terminal end. Thus, a curable thermosetting PPE resin including a vinyl group on the terminal end can be obtained. Since the dehydrogenation of side chain methyl using n-BuLi is not conducted in the process of the present invention, the process is much easier, and the cost can be decreased.

Abstract: The present invention relates to a vulcanizable rubber composition which can be used for the manufacture of tires. The invention also provides for a tire, the tread of which comprises such a composition. The rubber composition posses improved hysteresis and physical properties in the vulcanized state, while retaining satisfactory processing properties in the non-vulcanized state. The rubber composition comprises a reinforcing white filler and a diene block copolymer which is intended to interact with the white filler, the block copolymer comprising a diene block polymer having on at least one chain end thereof a polyether block having a molecular weight of between 1000 g/mol and 3000 g/mol, the polyether block corresponding to the formula: O—CH2—CH2—O)n—R,  (I) in which n is an integer other than zero and R is a saturated or unsaturated hydrocarbon.

Abstract: There is disclosed a resin composition for electrodeposition paint comprising (A) a resin containing hydroxyl group, and (B) a polyisocyanate compound blocked with an amidoalcohol having at least one amide bond and at least one alcoholic hydroxyl group in the molecule, excellent in storage stability and capable of forming a coating film excellent in low temperature curability.

Abstract: A rubber vibration insulator for use in a vibration insulation device integrated into precision instruments such as acoustic, computer-associated and game instruments, which insulator has a low hardness, a small compression set, a large loss tangent and a small temperature dependence and can be prepared by curing a rubber composition comprising 100 parts by weight of a partially crosslinked butyl rubber and 50 to 200 parts by weight of an extender component as well as a vulcanizing agent.

Abstract: A golf ball comprising a center comprising a polybutadiene having a molecular weight of greater than 200,000 and a resilience index of at least about 40; and a cover layer comprising a polyurethane composition formed from a prepolymer having no greater than 7.5 percent by weight unreacted isocyanate groups.

Abstract: The present invention relates to titanium and zirconium compounds of the formulae

Abstract: A low compression, resilient golf ball having a center and a cover, made from a polybutadiene reaction product having polybutadiene, a cis-to-trans catalyst including a Group VIA element, such as at least one of sulfur, polymeric sulfur, selenium, or tellurium, and a free radical source. The reaction product typically has a first dynamic stiffness measured at −50° C. that is less than about 130 percent of a second dynamic stiffness measured at 0° C. A multi-layer golf ball having a center, at least one intermediate layer disposed concentrically about the center, and a cover. At least a portion of at least one of the center, intermediate layer, or both, are made from a reaction product including polybutadiene having a cis-to-trans catalyst that includes at least one elemental sulfur, polymeric sulfur, selenium, or tellurium component and a free radical source.

Abstract: The reduction of hysteresis in a silica-filled, vulcanized elastomeric compound is produced by mixing diene monomer and optionally monovinyl aromatic monomer with an initiator and a coordinator; effecting polymerization conditions; terminating polymerization with a terminator containing an organo-tin group to form a tin-coupled diene elastomer; compounding the tin-coupled diene elastomer with an amorphous silica filler and a vulcanization agent; and, effecting vulcanization. A pneumatic tire tread stock incorporating the vulcanized elastomer compound exhibits decreased rolling resistance in the tire.

Abstract: The present invention relates to titanium and zirconium compounds of the formulae (R1—O&Parenclosest;yX&Parenopenst;O—R2—W)z  I wherein each R1 is independently selected from the group consisting of alkyl radicals having from 1 to 8 carbon atoms; R2 is a divalent radical selected from the group consisting of alkylenes having 1 to 15 carbon atoms, arylene and alkyl substituted arylene groups having 6 to 10 carbon atoms; W is an epoxy group; and y is an integer of from 1 to 3, z is an integer of from 1 to 3 and the sum of y and z equals 4; and X is titanium or zirconium.

Abstract: Improved compositions of the present invention are made from a rubber latex component (A) and an oil carrier component (B) having hygroscopic and vulcanizing agents. Upon intermixing of the components A and B, an elastomeric composition is formed that can undergo a rheological transformation from a flowable liquid to a solidified elastomeric solid. An improved linear slope between fluidity and temperature is achieved by using naphthenic oil in the oil carrier component (B) with an organic rheology modifier, such as a modified castor oil and/or a polyamide. Further exemplary compositions comprise an inorganic rheology modifier such as an activated clay.

Abstract: The present invention provides a novel improved method for crosslinking an isoprene-isobutylene rubber, an ethylene-propylene-diene rubber containing ethylidenenorbornene as an unsaturated component, or a mixture of an isoprene-isobutylene rubber and an ethylene-propylene-diene rubber containing ethylidenenorbornene as an unsaturated component, which method comprises thermally crosslinking the above rubber or rubber mixture using an alkylphenol-formaldehyde resin, 3-(N-salicyloyl)amino-1,2,4-triazole and, as necessary, a hydrazide compound. The method can produce a crosslinked rubber product low in compression set and corrosivity to metals, without using any halogen compound as a crosslinking co-agent.

Abstract: One-component, heat-curing reactive compositions based on liquid rubbers containing reactive olefinic double bonds and optionally solid rubbers and vulcanization systems based on sulfur have high maxima of the acoustic loss factor over a broad in-use temperature range of around +10° C. to +40° C. in their vulcanized state. These compositions optionally contain fine-particle thermoplastic polymers as an additional component. The compositions are suitable for use as acoustically damping adhesives, sealing compounds or coating compositions.

Abstract: A curable resin composition comprising a modified cycloolefin addition polymer (A) obtained by introducing a functional group into a cycloolefin addition polymer containing a repeating unit (a) derived from a cycloolefin monomer having an organic group having at least 4 carbon atoms at its side chain at a rate of introduction of the functional group of 0.1 to 50 mol % based on the whole repeating unit of the cycloolefin addition polymer, and a hardening agent (B), and a modified cycloolefin addition polymer (A) obtained by introducing a functional group into a cycloolefin addition polymer containing a repeating unit (a) derived from a cycloolefin monomer having an organic group having at least 4 carbon atoms at its side chain at a rate of introduction of the functional group of 0.1 to 50 mol % based on the whole repeating unit of the cycloolefin addition polymer, and having a weight average molecular weight (Mw) of 1,000 to 1,000,000.

Abstract: Medical devices of synthetic rubber are prepared from cis-1,4-polyisoprene by dip molding without the use of sulfur containing components. The devices have surprisingly favorable tensile characteristics despite what is known in regard to synthetic cis-1,4-polyisoprene. In addition, the absence of both the proteins present in natural rubber and the sulfur components that are typically used in vulcanization of both natural rubber and cis-1,4-polyisoprene of the prior art renders the devices freely usable without causing the user to suffer Type I or Type IV allergic reactions that typically arise from contact with natural rubber.

Abstract: One-component, heat-curing reactive compositions based on liquid rubbers containing reactive olefinic double bonds and optionally solid rubbers and vulcanization systems based on sulfur have high maxima of the acoustic loss factor over a broad in-use temperature range of around +10° C. to +40° C. in their vulcanized state. These compositions optionally contain fine-particle thermoplastic polymers as an additional component. The compositions are suitable for use as acoustically damping adhesives, sealing compounds or coating compositions.

Abstract: The invention relates to polymeric sulfur compounds, their preparation and their use as vulcanizing agcnts for unsaturated rubber mixtures.

Abstract: A base rubber selected from natural rubber and diene rubber is blended with, based on 100 parts by weight of the base rubber, 0.5 to 5 parts by weight of a 2,2,4-trimethyl-1,2-dihydroquinoline polymer having a primary amine content of not more than 1% by weight, a monomer content of not more than 3% by weight and a dimer content of at least 30% by weight. The resulting rubber composition is vulcanized in contact with a reinforcing material such as an organic fiber or a steel cord. The rubber article thus obtained and reinforced with the reinforcing material is excellent in adhesiveness between the rubber and the reinforcing material, and further in thermal resistance.

Abstract: There is disclosed a resin composition for electrodeposition paint comprising (A) a resin containing hydroxyl groups, and (B) a polyisocyanate compound blocked with an amidoalcohol having at least one amide bond and at least one alcoholic hydroxyl group in the molecule, excellent in storage stability and capable of forming a coating film excellent in low temperature curability.

Abstract: Disclosed herein is a game ball and method for making the same. The game ball has a non-ionomeric cover which has been crosslinked by incorporating a dialkyl peroxide in the polymer mix prior to molding. The game ball cover is superior in at least one of cut resistance and scuff resistance to a conventional cover that does not have covalent crosslinks but is otherwise substantially identical in composition. The game ball cover of the invention is particularly useful for improving the durability of golf balls to be struck with sharp-grooved clubs. The peroxide may be omitted and the cover crosslinked using post formation irradiation.

Abstract: The invention relates to preparation of EPDM-based and EPR-based rubber compositions which are vulcanized with peroxide together with a specified combination of sulfur and acrylate co-agents. The invention further relates to articles having at least one component thereof.

Abstract: The present invention provides a solid golf ball which attains long flying distance and is superior in hit feeling and durability. The present invention provides a solid golf ball in which at least a portion thereof is made of rubber, wherein the rubber portion is a crosslinked, molded rubber composition comprising a base rubber, a co-crosslinking agent and peroxides, the base rubber comprising a polybutadiene modified with a tin compound and having a cis content of 40% or more.

Abstract: Tire rubbers which are prepared by anionic polymerization are frequently coupled with a suitable coupling agent, such as a tin halide, to improve desired properties. It has been unexpectedly found that greatly improved properties for tire rubbers, such as lower hysteresis, can be attained by asymmetrically coupling the rubber.

Abstract: The reduction of hysteresis in a silica-filled, vulcanized elastomeric compound is produced by mixing diene monomer and optionally monovinyl aromatic monomer with an initiator and a coordinator; effecting polymerization conditions; terminating polymerization with a terminator containing an organo-tin group to form a tin-coupled diene elastomer; compounding the tin-coupled diene elastomer with an amorphous silica filler and a vulcanization agent; and, effecting vulcanization. A pneumatic tire tread stock incorporating the vulcanized elastomer compound exhibits decreased rolling resistance in the tire.

Abstract: A vulcanizate that has improved damping properties where the vulcanizate is prepared by the steps comprising blending a saturated damping additive within a vulcanizable composition of matter, wherein the vulcanizable composition of matter includes a vulcanizable elastomer, and effecting vulcanization of the elastomer.

Abstract: High vinyl styrene-butadiene rubber is cured through the use of organic peroxides. The organic peroxide may be used singly or in combination with sulfur curing ingredients to cure the high vinyl styrene-butadiene rubber wherein the organic peroxide to sulfur curing ingredient is at a molar ratio of from about 3:1 to about 1:3.

Abstract: A process for producing a vulcanizable rubber composition containing silica and carbon black, comprises the step of intimately mixing at a temperature of from 130° to 180° C. at least a first cross-linkable unsaturated chain polymer with a first carbon black-based reinforcing filler, so as to obtain a first rubber composition capable of allowing a subsequent effective dispersion of a second silica-based reinforcing filler and of a second cross-linkable unsaturated chain polymer. The rubber composition thus obtained shows a homogeneous dispersion of the reinforcing fillers, in particular of the silica-based reinforcing filler, constant physical-mechanical characteristics, and improved drawability, and is particularly suitable for the manufacture of tire treads with low rolling resistance.