Abstract: A tire is provided with an outer sidewall, said outer sidewall comprising at least a rubber composition based on at least an elastomer, a reinforcing filler, a crosslinking system and more than 25 phr of a crumb rubber.

Abstract: The invention relates to a sulfur-crosslinkable rubber mixture comprising a rubber blend composed of at least one solution-polymerized diene polymer A of high molecular weight and at least one solution-polymerized polymer B of low molecular weight, wherein at least one of polymers A and B has been functionalized at the chain end and/or along the polymer chain and/or at a coupling site with at least one group selected from epoxy groups, hydroxyl groups, carboxyl groups, silane sulfide groups, amino groups, siloxane groups, organosilicon groups, phthalocyanine groups and amino group-containing alkoxysilyl groups, 30 to 300 phr of at least one silica and 1 to 20 phf of at least one substance of formula I) as silane coupling agent (R1R2R3)Si—S4—Si(R3R2R1)??II) where R1, R2, R3 in the structure may be the same or different and may be selected from linear or branched alkoxy, cycloalkoxy, alkyl, cycloalkyl or aryl groups having 1 to 20 carbon atoms.

Abstract: The present disclosure provides a fuel composition for improving the lubricity property. Further provided is a process for preparation of the composition.

Abstract: The present invention relates to polymer blend that includes (a) 50 to 90 percent by weight of a first elastomeric polymer having a high molecular weight, (b) 5 to 50 percent by weight, preferably 5 to 40 percent by weight, more preferably 10 to 35 percent by weight, of a second elastomeric polymer having a low molecular weight and being coupled, wherein the amounts of the components (a) and (b) are based on the total weight of the polymer blend.

Abstract: Provided is a resin composition for a solid polymer fuel cell sealing material, the resin composition including a copolymer resin having a weight average molecular weight of 150,000 or more and formed by copolymerizing raw material components including: (a1) 5% by mass or more of styrene; and (b) 20% by mass or less of glycidyl (meth)acrylate. Preferably, the raw material components are configured to further include (c) one or more kinds of other polymerizable monomers selected from a hydroxyalkyl (meth)acrylate and an alkyl (meth)acrylate.

Abstract: A rubber composition for vibration damping rubbers, comprises a rubber component, a sulfur-based vulcanizing agent, a resin, and a bismaleimide. The resin is a mixed resin comprising at least an aromatic hydrocarbon resin and an aliphatic hydrocarbon resin. When the total amount of the rubber component is regarded as 100 parts by weight, the rubber composition preferably contains 1.5 parts by weight or less of the sulfur-based vulcanizing agent.

Abstract: A rubber composition for vibration damping rubbers, comprises a rubber component, a sulfur-based vulcanizing agent, a resin, and a bismaleimide. The resin is a mixed resin comprising at least an aromatic hydrocarbon resin and an aliphatic hydrocarbon resin. When the total amount of the rubber component is regarded as 100 parts by weight, the rubber composition preferably contains 1.5 parts by weight or less of the sulfur-based vulcanizing agent.

Abstract: A rubber composition for tires which enables a balanced improvement in rolling resistance, abrasion resistance, and wet-skid performance which contains a rubber blend, including a diene rubber A modified with a specific acrylamide compound, and a diene rubber B modified with either a combination of a specific silicon or tin compound and a specific modifying compound or with the modifying compound, the combined rubbers A and B having a weight average molecular weight of 300,000 to 1,400,000; and a specific silica.

Abstract: This invention provides a rubber composition being excellent in the workability during production and the heat resistance and high in the storage elastic modulus (G?) and small in the loss tangent (tan ?), which is formed by compounding 1-60 parts by mass of a low-molecular weight conjugated diene-based polymer (B) having a weight average molecular weight as measured through a gel permeation chromatography and converted to polystyrene of 10,000-200,000 and a vinyl bond content in a conjugated diene compound portion of not less than 40% based on 100 parts by mass of a rubber component (A) comprised of at least one selected from the group consisting of natural rubber, polyisoprene rubber, styrene-butadiene copolymer rubber, polybutadiene rubber and isobutylene isoprene rubber, wherein the rubber component (A) comprises natural rubber and/or polyisoprene rubber and a proportion of styrene units in total of the low-molecular weight conjugated diene-based polymer (B) is less than 5% by mass.

Abstract: A method of producing a rubber compound for a tread portion designed to assume, with use, a porous surface with a 75 to 800 ?m pore area. The method includes a first mixing step, in which a polymer base, recycled rubber, and silica are mixed together; and a second mixing step, in which a curing system is added and mixed to the compound from the first mixing step. 5 to 20 phr of recycled rubber is added at the first mixing step. The recycled rubber is 75 to 800 um in size, and is treated beforehand cryogenically. And the polymer base is selected from SBR, BR, NR and mixtures thereof. The invention also relates to a rubber compound for producing a tread portion, a tread portion and a winter tire comprising said tread portion.

Abstract: A golf ball endowed with a good rebound and an excellent flight performance can be obtained using a golf ball composition of good workability which contains a diene polymer having a peak top molecular weight (Mp) on a molecular weight distribution curve measured using gel permeation chromatography (GPC) of at least 40×104 and not more than 100×104.

Abstract: The present invention provides a functional diene polymer, a preparation method thereof and a rubber composition comprising the functional diene polymer. The functional diene polymer comprises at least one type of conjugated diene structural units and silane coupler functional units represented by formula (I) in its molecular chain, and the number-average molecular weight of the functional diene polymer is 50,000˜1,000,000; R1-R4 are C1-C20 linear or branched alkyl or heteroatom-containing C1-C20 linear or branched alkyl, and the heteroatom is selected from one or more of halogen, oxygen, sulfur, silicon, and phosphorus. Not only the relationship between the wet slip resistance and the rolling resistance of the functional diene polymer is effectively improved, but also the offensive odor produced in the rubber mixing process owing to the addition of the silane coupler is reduced.

Abstract: Multi-piece golf balls having a core made of a composition comprising a polybutadiene rubber blend are provided. The blend includes a non-metallocene catalyzed polybutadiene rubber and a metallocene-catalyzed polybutadiene rubber. Catalysts such as neodymium, nickel, and cobalt based catalysts may be used to make the non-metallocene catalyzed rubber. Catalysts such as ferrocene, cobaltocene, nickelocene, titanocene dichloride, zirconocene dichloride, and samraocene based catalysts may be used to make the metallocene-catalyzed rubber. The golf ball may contain single layered core or multi-layered cores. The core is surrounded by a cover having at least one layer. The resulting ball has high resiliency and a soft compression feel.

Abstract: The present invention provides a rubber composition for a sidewall or base tread, which offers good flex crack growth resistance, crack initiation resistance, durability, and fuel economy despite the use of a softener derived from non-petroleum resources; and also provides a pneumatic tire formed from the rubber composition. The present invention relates to a rubber composition for a sidewall or base tread, containing a rubber component including at least two kinds of diene rubbers, and a myrcene polymer, wherein the rubber component includes at least one kind of diene rubber selected from the group consisting of natural rubber, epoxidized natural rubber, and butadiene rubber, and the myrcene polymer has a weight average molecular weight of 1000 to 500000.

Abstract: The invention relates to a composition, especially for an elastomer body of an elastic coupling, comprising the following components:—polyisoprene rubber having a proportion of 20 to 30% by weight,—butadiene rubber having a proportion of 20 to 30% by weight, based in each case on the total weight of the composition. The invention further relates to the use of the composition for production of an elastomer body, especially for an elastic coupling, preferably elastic shaft coupling. The invention additionally relates to an elastomer body, especially for an elastic coupling, which comprises the composition. The invention also relates to a coupling comprising the composition or the elastomer body.

Abstract: The method for preparation of polyisoprene includes conducting polymerization reaction of isoprene in a first organic solvent under the presence of rare earth catalyst I and rare earth catalyst II, to obtain polyisoprene with bimodal molecular weight distribution, wherein the polymerization reaction conditions are controlled to ensure the peak molecular weight of the high molecular weight component fraction in the polyisoprene is 1×106-2×106 and the peak molecular weight of the low molecular weight component fraction is 2×105-4×105, and the weight ratio of content of the high molecular weight component fraction to the low molecular weight component fraction is 1-25:1. The molecular weight distribution of the polyisoprene obtained with the method provided is bimodal distribution; therefore, the polyisoprene not only has the mechanical properties of polyisoprene with high molecular weight, but also has the processability of polyisoprene with low molecular weight.

Abstract: Provided are: a polymer capable of providing a crosslinked rubber composition with improved durability (i.e., breaking resistance, abrasion resistance, and crack growth resistance) and a method for producing the same, a rubber composition containing the polymer, a crosslinked rubber composition obtained by crosslinking the rubber composition, and a tire having the crosslinked rubber composition. The polymer is either a synthesized polyisoprene or an isoprene copolymer, and contains a residual catalyst in an amount of 300 ppm or less.

Abstract: The present invention relates to a rubber composition for a conveyor belt that enables the provision of a conveyor belt having sufficiently good tensile strength, tear resistance, abrasion resistance, and cut resistance and, more specifically, to a rubber composition for a conveyor belt that contains, with respect to 100 parts by mass of a rubber component containing 40 to 70 mass % of natural rubber, 10 to 25 mass % of styrene butadiene rubber, and 15 to 35 mass % of butadiene rubber, 1 to 5 parts by mass of a resin component.

Abstract: Provided is a studless winter tire which provides good performance on ice and snow and good abrasion resistance, and suffers little change in hardness and little discoloration on the tire surface. The present invention relates to a studless winter tire including a tread formed from a rubber composition containing a predetermined amount of a farnesene resin obtained by polymerizing farnesene. The present invention relates to a studless winter tire including a tread formed from a rubber composition containing a predetermined amount of at least one myrcene resin selected from the group consisting of myrcene polymers with a Mw of 1,000-500,000, myrcene-butadiene copolymers with a Mw of 1,000-500,000, and myrcene-styrene copolymers with a Mw of 1,000-150,000; and a predetermined amount of a silica with an N2SA of 40-400 m2/g, the rubber component containing a predetermined amount of a high-cis polybutadiene with a cis content of 95% by mass or more.

Abstract: A biaxially oriented multilayer film having (a) a polyolefinic core layer containing (i) a thermoplastic material containing an alpha-olefin/polypropylene-containing copolymer, the thermoplastic material being in an amount of about 10% to 70% by weight of the core layer and (ii) an isotactic polypropylene-containing copolymer in an amount of greater than 0% to about 50% by weight of the core layer and (b) a skin layer containing a styrene-butadiene copolymer or a cyclic olefin copolymer is disclosed.

Abstract: The present invention has its object to provide a rubber composition excellent in low-exothermic property, breaking strength, and crack growth resistance, and a pneumatic tire including at least one of a base tread, a cushion, a carcass and a tie gum that are prepared using the rubber composition. The present invention relates to a rubber composition including: a rubber component which contains (a) 10 to 30% by mass of at least one of a butadiene rubber modified by a compound represented by the formula (1): and a tin-modified polybutadiene rubber resulting from polymerization with a lithium initiator (b) 10 to 40% by mass of a modified styrene-butadiene rubber having a bound-styrene content of 21% by mass or less; and (c) 20 to 80% by mass of a diene rubber other than (a) and (b), and (d) 7 to 50 parts by mass of silica per 100 parts by mass of the rubber component.

Abstract: The present invention provides a rubber composition for a sidewall or base tread, which offers good flex crack growth resistance, crack initiation resistance, durability, and fuel economy despite the use of a softener derived from non-petroleum resources; and also provides a pneumatic tire formed from the rubber composition. The present invention relates to a rubber composition for a sidewall or base tread, containing a rubber component including at least two kinds of diene rubbers, and a myrcene polymer, wherein the rubber component includes at least one kind of diene rubber selected from the group consisting of natural rubber, epoxidized natural rubber, and butadiene rubber, and the myrcene polymer has a weight average molecular weight of 1000 to 500000.

Abstract: The invention provides a rubber composition for tires, enabling a balanced improvement of processability, rubber strength, fuel economy, and crack growth resistance; and a pneumatic tire formed from the rubber composition. The invention relates to a rubber composition for tires, including: a butadiene rubber (a) having a cis content of 96% by mass or more, a Mooney viscosity of 35 to 75, and a ratio of (Weight average molecular weight (Mw))/(Number average molecular weight (Mn)) of 2.7 or less; and a butadiene rubber (b) containing 1,2-syndiotactic polybutadiene crystals with a melting point of 90 to 140° C., and having a weight average molecular weight of 50,000 to 500,000.

Abstract: Provided are a pressure-sensitive adhesive composition comprising, as a rubber component, at least two modified rubbers modified with a polar functional group and having different modification rates with each other, a laminate body comprising (A) a resin film layer and (B) a rubber elastic body layer wherein they are adhered via (C) the said pressure-sensitive adhesive composition, and a pneumatic tire having the said laminate body as an inner liner layer; and thus, provided are the pressure-sensitive adhesive composition that can firmly bond between the resin film layer and the rubber elastic body layer while the laminate body obtained therefrom does not generate cracks at low temperature, the laminate body using the said pressure-sensitive adhesive composition, and the pneumatic tire.

Abstract: Methods for making elastomer compounds are described. The compounds include reclaimed vulcanized elastomer materials such as micronized rubber powders (MRP). The elastomeric compositions exhibit lower tensile strength variability. As described herein, shorter mixing times can be used to achieve the same minimum tensile strength as composition containing no reclaimed material. The elastomeric compositions may include various proportions of reclaimed vulcanized elastomer materials. A rubber compound is also described which comprises reclaimed material and which has a minimum tensile strength equal to or higher than a predetermined minimum tensile strength associated with a compound containing no reclaimed material. The rubber compound is manufactured with a reduced mixing time compared to that of the compound with no MRP.

Abstract: A rubber composition for sidewall and a tire having sidewall using thereof as well as a rubber composition for clinch and a tire having clinch using thereof that adjust scorch time and suppress surface bloom, reduce rolling resistance, can obtain sufficient rigidity as sidewall and clinch, and can improve elongation at break and durability is disclosed. Specifically, a rubber composition for sidewall and a rubber composition for clinch including specific amount of an alkylphenol-sulfur chloride condensate indicated by the formula (B1): and specific filler, based on a rubber component including specific amount of a natural rubber and/or an isoprene rubber and a butadiene rubber and/or an epoxidized natural rubber, and a tire having sidewall using thereof and clinch using thereof is disclosed.

Abstract: A rubber composition for a sidewall is disclosed, which includes a specific amount of an alkylphenol-sulfur chloride condensate indicated by the formula (B1): and a specific filler, based on a rubber component including a specific amount of a natural rubber and/or an isoprene rubber and a modified butadiene rubber. A tire having the above sidewall is also disclosed.

Abstract: The disclosure is directed to a thermoplastic vulcanizate composition comprising a dynamically-cured rubber; from about 20 to about 300 parts by weight of a thermoplastic resin per 100 parts by weight rubber and from about 30 to about 250 parts by weight additional oil per 100 parts by weight rubber; wherein the rubber comprises a multimodal polymer composition cured with a curing agent, the multimodal polymer composition comprising 45 to 75 wt % of a first polymer fraction and 25 to 55 wt % of a second polymer fraction, each comprising ethylene, a C3-C10 alpha-olefin, and a non-conjugated diene. A method of producing the thermoplastic vulcanizate is also disclosed.

Abstract: The method for preparation of polyisoprene includes conducting polymerization reaction of isoprene in a first organic solvent under the presence of rare earth catalyst I and rare earth catalyst II, to obtain polyisoprene with bimodal molecular weight distribution, wherein the polymerization reaction conditions are controlled to ensure the peak molecular weight of the high molecular weight component fraction in the polyisoprene is 1×106-2×106 and the peak molecular weight of the low molecular weight component fraction is 2×105-4×105, and the weight ratio of content of the high molecular weight component fraction to the low molecular weight component fraction is 1-25:1. The molecular weight distribution of the polyisoprene obtained with the method provided is bimodal distribution; therefore, the polyisoprene not only has the mechanical properties of polyisoprene with high molecular weight, but also has the processability of polyisoprene with low molecular weight.

Abstract: The invention relates to golf ball formulations formed from blends of linear and branched polybutadienes catalyzed with neodymium that have improved properties and processing characteristics. Golf ball components may be formed from the blends to provide high coefficient of restitution.

Abstract: The invention relates to a functionalized diene elastomer composed: a) of a diene elastomer functionalized, at the chain end or in the middle of the chain, by a tin functional group, exhibiting a monomodal distribution of molecular weights before functionalization and a polydispersity index before functionalization of less than or equal to 1.3, b) of a diene elastomer star-branched with a tin compound, exhibiting a monomodal distribution of molecular weights before star-branching and a polydispersity index before star-branching of less than or equal to 1.3, and c) of a content of less than 15% by weight, with respect to the total weight of the functionalized diene elastomer, of a non-tin-functional diene elastomer, the said diene elastomers a), b) and c) being, before optional functionalization or optional star-branching, the same in nature.

Abstract: The present invention describes a composition comprising a diene-based rubber and at least one cyclo-aliphatic epoxide-based polyether or polyglycol ether. The present invention also describes a composition comprising at least one extending oil and at least one cyclo-aliphatic epoxide-based polyether or polyglycol ether, wherein the at least one extending oil is selected from the group consisting of an aromatic oil, an aliphatic oil, a naphthenic oil, and mixtures thereof.

Abstract: Polyolefin based sealing element compositions with good oxygen barrier properties particularly suitable for forming sealing elements, for example gaskets and cap liners that are especially useful for sealing containers having products such as liquids or food-stuffs therein. The compositions when formed as sealing elements do not appreciably contribute taste and/or odor to a packaged product including the sealing element. The compositions have desirable rheological properties and are thus readily processable at various temperatures.

Abstract: A pneumatic tire for a commercial vehicle with a tread, wherein at least the part of the tread which comes into contact with the road contains a sulphur-vulcanized rubber mixture. The sulphur-vulcanized rubber mixture contains 90 to 50 phr (parts by weight, based on 100 parts by weight, of all of the rubbers in the mixture) of natural rubber, 10 to 50 phr of at least one polybutadiene having a glass transition temperature Tg of ?110 to ?65° C. and 5 to 50 phr of at least one aliphatic and/or aromatic hydrocarbon resin having a softening point (ring and ball to ASTM E 28) of 0 to 150° C., and a mean molecular weight Mn of less than 2000 g/mol and a polydispersity D=Mw/Mn of 1 to 5.

Abstract: A method for processing rubber granules or rubber powders containing different types of rubber. Vehicle tires containing natural rubber in the tread and butyl rubber in the inner liner are granulated or ground to prepare rubber granules or rubber powders, which are processed in a flotation cell under stirring and with the addition of air. The natural rubber fraction of the rubber granules has a higher tendency to adsorb air bubbles and to rise in the flotation cell, while the butyl rubber fraction remains at the bottom. The rubber granules are separated into two or more rubber fractions with an increased amount of a specific rubber type in each fraction.

Abstract: The invention provides a first composition comprising at least the following: i) a modified polymer comprising at least one branched modified polymer macromolecule (b1) and at least one linear modified polymer macromolecule (a1), and wherein the at least one branched modified polymer macromolecule and the at least one linear modified polymer macromolecule each, independently, comprises at least one amine group selected from the group consisting of formulas (1A-1F), each as described above: and combinations thereof; and wherein the at least one branched modified polymer macromolecule further comprises one of the structures (ib1-ib4) as described above, and the at least one linear modified polymer macromolecule further comprises one of the structures (iib1) as described above (see Formula 3A)

Abstract: This invention relates to a pneumatic tire with an outer, running surface containing, circumferential tread comprised of a styrene/butadiene (SBR) rich rubber composition containing two SBR's with spaced apart glass transition temperatures (Tg's), one of which is a functionalized SBR with a functional group reactive with hydroxyl groups on a precipitated silica, together with a combination of at least three resins with spaced apart softening points. The filler reinforcement is a combination of precipitated silica and specialized rubber reinforcing carbon black.

Abstract: A rubber composition for a tire, and a pneumatic tire are provided in which the fuel economy, abrasion resistance, and deterioration resistance can be improved in a good balance. The present invention relates to a rubber composition for a tire, containing a rubber component that contains: a modified natural rubber having a phosphorus content of not more than 200 ppm; and butadiene rubber, wherein 60 to 95% by mass of the modified natural rubber and 5 to 40% by mass of the butadiene rubber are contained based on 100% by mass of the rubber component.

Abstract: The copolymer rubber composition comprises 60 to 75% by weight of a copolymer rubber (1) and 40 to 25% by weight of a copolymer rubber (2), and [iodine value of the copolymer rubber (1)?iodine value of the copolymer rubber (2)] is 5 to 30. The copolymer rubber (1) is an ethylene-?-olefin-nonconjugated polyene copolymer rubber having an ethylene unit of 50 mol % to 70 mol %, an ?-olefin unit of 50 mol % to 30 mol %, and an iodine value of 15 to 45, and the copolymer rubber (2) is an ethylene-?-olefinic copolymer rubber having an ethylene unit of more than 70 mol % and 95 mol % or less, an ?-olefin unit of less than 30 mol % and 5 mol % or more, and an iodine value of 10 to 30.

Abstract: Elastomer compositions comprising uncured elastomer and reclaimed elastomer are described. In one embodiment, the compositions comprise reclaimed elastomer material (micronized rubber powder) of broad particle size distribution, which is less expensive than traditional reclaimed elastomer material with narrow particle size distribution. Further, compositions comprising reclaimed elastomer materials with broad particle size distribution perform comparably to those comprising reclaimed elastomer materials with narrow particle size distribution. In other embodiments, the compositions comprise both vulcanized and devulcanized elastomer materials. Advantageously, by using a combination of vulcanized and devulcanized material, it is possible to incorporate a greater percentage by weight of reclaimed material in to an elastomer composition, thus providing additional cost savings while maintaining high levels of mechanical properties.

Abstract: The present invention has its object to provide a rubber composition for a cap tread capable of improving the performance on snow and ice and the wet performance in good balance, and a studless tire having a cap tread produced from the rubber composition. The present invention relates to a rubber composition for a cap tread, including a rubber component that contains epoxidized natural rubber and butadiene rubber, the rubber component containing 1 to 85% by mass of the epoxidized natural rubber, based on 100% by mass of the rubber component, and the epoxidized natural rubber having an epoxidation degree of 1.5 to 40 mol %.

Abstract: The instant disclosure is directed to a thermoplastic vulcanizate composition comprising a dynamically-cured rubber; from about 20 to about 300 parts by weight of a thermoplastic resin per 100 parts by weight rubber and from about 30 to about 250 parts by weight additional oil per 100 parts by weight rubber; wherein the rubber comprises a multimodal polymer composition cured with a curing agent, the multimodal polymer composition comprising 45 to 75 wt % of a first polymer fraction and 25 to 55 wt % of a second polymer fraction, each comprising ethylene, a C3-C10 alpha-olefin, and a non-conjugated diene, wherein the polymer fractions have been polymerized using a Ziegler-Natta catalyst system, wherein the first polymer fraction has a Mooney viscosity of greater than or equal to about 150 ML(1+4@125° C.), and the second polymer fraction has a Mooney viscosity of about 20 ML to about 120 ML; and about 10 phr to about 50 phr of an extender oil.

Abstract: Branched polymers including multi-branched polymers, functionalized branched polymers, star-branched polymers, and dendigraft polymers. Methods for the synthesis of branched polymers and method for the use of branched polymers in tire components are also included.

Abstract: A process of preparing a telechelic polyolefin is disclosed by performing steps 1a, 2, and 1b in this order in the presence of an olefin polymerizing catalyst and subsequently performing step 3 if necessary. Step 1a involves reacting the olefin polymerizing catalyst with a polar-group-containing olefin (C). Step 2 involves reacting the resultant compound of step 1a with at least one olefin (D) selected from ethylene and olefins having 3 to 20 carbon atoms n times wherein n is an integer of 1 or more, provided that when n is an integer of 2 or more, the olefins (D) used in the respective contact operations are different in kind or composition. Step 1b involves reacting the resultant compound of step 2 with the same or different polar-group-containing olefin (C). Step 3 involves chemically converting the Y? group in the general formula (II) to a different group.

Abstract: The present invention relates to an acrylic foam composition comprising an acrylic polymer and an acrylic processing aid which exhibits increased flexibility characteristics over other types of foam compositions.

Abstract: A catalyst for polymerization of conjugated diene is provided, which facilitates manufacture of a conjugated diene polymer with a high 1,4-cis structure content, leaves less aluminum residue on polymerization, and has high activity. A method of manufacturing conjugated diene polymers using the catalyst is also provided. A catalyst for polymerization of conjugated diene comprises (A) an yttrium compound; (B) an ionic compound including a non-coordinate anion and a cation; and (C) an organometallic compound including an element selected from the groups 2, 12 and 13 of the periodic table.

Abstract: A conjugated diene polymer rubber is provided that includes component (A) and component (B) below, component (A) having a content, with the total amount of component (A) and component (B) as 100% by weight, of from 5% to 90% by weight, and component (B) having a content of from 95% to 10% by weight, Component (A): a conjugated diene polymer rubber component modified with a carbonyl group- and substituted amino group-containing compound Component (B): a conjugated diene polymer rubber component modified with a compound represented by formula (IIa) below (R21O)mSi(R22A)nR234-m-n??(IIa) wherein m denotes a number from 1 to 3, n denotes a number from 1 to 3, m+n is from 2 to 4, R21 and R23 denote a hydrocarbyl group, R22 denotes a hydrocarbylene group, A denotes a substituted amino group or an optionally substituted hydrocarbyloxy group, when there are a plurality of R21s the plurality of R21s may be identical to or different from each other, when there are a plurality of R22s the plurality of R22s may be i

Abstract: A telechelic polyolefin represented by the following general formula (I): X—P—Y??(1) wherein X and Y are each a group containing at least one element selected from oxygen, sulfur, nitrogen, phosphorus and halogens, X and Y may be the same or different, P represents a chain made mainly of an olefin composed only of carbon and hydrogen atoms, and X and Y are bonded to both terminals of P, wherein the molecular weight distribution (Mw/Mn) obtained by gel permeation chromatography (GPC) is from 1.0 to 1.5, is useful for various purposes.

Abstract: A process of making a polymer is described. The process includes contacting one or more olefinic monomers in the presence of at least a high molecular weight (HMW) catalyst and at least a low molecular weight (LMW) catalyst in a polymerization reactor system; and effectuating the polymerization of the one or more olefinic monomers in the polymerization reactor system to obtain an olefin polymer, wherein the LMW catalyst has an RvL, defined as R v L = [ vinyl ] [ vinyl ] + [ vinylidene ] + [ cis ] + [ trans ] wherein [vinyl] is the concentration of vinyl groups in the olefin polymer produced by the low molecular weight catalyst expressed in vinyls/1,000 carbon atoms; [vinylidene], [cis] and [trans] are the concentration of vinylidene, cis and trans groups in the olefin polymer expressed in the number of the respective groups per 1,000 carbon atoms, of greater than 0.12, and wherein the HMW catalyst has a reactivity ratio, r1 of about 5 or less.

Abstract: A polymer composition that has a backbone chain; and a plurality of long chain branches connected to the backbone is described. The polymer composition also has a value of 2g?LCB-1g?LCB g?2LCB-g?1LCB that is less than about 0.22, where 1g?LCB g?2LCB is the long chain branching index for a fraction of the composition having a Mw of 100,000 and 2g?LCB g?1LCB is the long chain branching index for a fraction of the composition having a Mw of 500,000.