Abstract: A method for producing a conjugated diene polymer is provided that includes a step of polymerizing a conjugated diene-containing monomer in a hydrocarbon solvent in the presence of an alkali metal catalyst, thus giving a polymer having a catalyst-derived alkali metal at one terminus of a polymer chain comprising a conjugated diene-based monomer unit, and a step of reacting the polymer obtained in the step of polymerizing and a trialkoxysilane compound represented by the formula below. (In the formula, Y and Z independently denote an oxygen atom or a sulfur atom, R1, R2, and R3 independently denote an alkyl group having 1 to 4 carbon atoms, m denotes an integer of 1 to 5, and n denotes an integer of 0 to 5.

Abstract: Sulfenamide derivatives of 4-alkyl substituted 2-mercapto benzothiazole (4m-MBT) as accelerators used in vulcanizable rubber composition having improved ‘Reversion Resistance’ and ‘Modulus & Hardness Stabilization’ properties for sulphur vulcanized tire compounds predominantly based on Natural Rubber or its blends with Polybutadiene (BR) and styrene butadiene rubber (SBR) in which Natural Rubber is the major component thereby improving the overall tire performance, ride safety and tyre service life.

Abstract: A method for preparing a functionalized polymer, the method comprising the steps of (i) polymerizing conjugated diene monomer by employing a lanthanide-based catalyst to form a reactive polymer, and (ii) reacting the reactive polymer with a protected oxime compound.

Abstract: The present invention relates to a process for the hydrogenation of the carbon-carbon double bonds in diene-based polymers in bulk form by treatment of said diene-based polymer with hydrogen in the presence of an iridium containing catalyst and in the absence of any organic solvent.

Abstract: The present invention relates to functionalizing agents that are particularly useful for functionalizing living rubbery polymers to make the polymer more compatible with fillers, such as carbon black and silica. These functionalizing agents are comprised of a boron containing compound having a structural formula selected from the group consisting of: wherein R is selected from the group consisting of hydrogen atoms, alkyl groups and aryl groups, wherein R1, R2, and R3 can be the same or different and are selected from the group consisting of alkyl groups, and aryl groups, and wherein R4 represents an alkylene group or a bridging aromatic group.

Abstract: A sulfonated block copolymer which is solid and non-dispersible in water having at least two polymer end blocks A and at least one polymer interior block B wherein each A block is a polymer containing essentially no sulfonic acid or sulfonate functional groups and each B block is a polymer block containing 10 to 100 mol percent sulfonic acid or sulfonate functional groups based on the number of monomer units of the B block, and wherein said A and B blocks do not contain any significant levels of olefinic unsaturation. Also claimed are processes for making such block copolymers, and the various end uses and applications for such block copolymers.

Abstract: There is provided a rubber composition for a tread having excellent hardness and improving the processability and grip performance of a tire, and a tire comprising thereof. A rubber composition for a tread comprising 30 to 80 parts by weight of silica having a BET specific surface area of less than 150 m2/g and 10 parts by weight or less of carbon black based on 100 parts by weight of a rubber component comprising an epoxidized natural rubber, and a tire comprising thereof.

Abstract: This invention provides a modified natural rubber latex formed by charging a polar group-containing mercapto compound into a natural rubber latex to add the polar group-containing mercapto compound to a natural rubber molecule in the natural rubber latex, a modified natural rubber formed by coagulating and drying the modified natural rubber latex, and the rubber composition using the modified natural rubber and being excellent in the low loss factor, wear resistance and fracture characteristics.

Abstract: Rubber-modified cementitious substances and various methods of making such substances or components thereof. One embodiment of the substance includes a mix of cement and composite particles, wherein essentially each of the composite particles has a rubber core enclosed in an inorganic exterior and wherein the rubber core is chemically coupled to the inorganic exterior. The chemical coupling between the rubber core and the inorganic exterior and the bonding between the inorganic exterior and the cement result in a rubber-modified cementitious substance that has greater strength than comparable conventional rubber-modified cementitious substances.

Abstract: A carrier composition for filling a tooth root canal, comprising a cross-linkable material.

Abstract: The present invention relates to nano-structured diene polymers and their preparation and to their use.

Abstract: After hydrolyzing a phospholipid bonded to a molecular end of a natural rubber, a compound having a polar group reacting with a hydroxyl group is condensed with a hydroxyl group contained in the phospholipid-hydrolyzed natural rubber to thereby obtain a modified natural rubber in which a polar group is present at a molecular end. The modified natural rubber thus obtained in which a polar group is present at a molecular end is used for a rubber component of a rubber composition, whereby a rubber composition in which carbon black and silica as fillers are bonded to the rubber component to enhance a reinforcing effect and which is excellent in a low hysteresis loss property and abrasion resistance to a large extent is obtained. An enzyme or an alkali is used for hydrolyzing the phospholipid, and a condensing agent is used for condensing the polar group-containing compound.

Abstract: This invention relates to a method for producing functionalized cis-1,4-polydienes having a combination of a high cis-1,4-linkage content and a high functionality, the resulting polymers and the vulcanized products containing the polymers. The functionalized cis-1,4-polydienes of the present invention are produced by a method comprising the steps of: (1) preparing a reactive polymer by polymerizing conjugated diene monomer with a lanthanide-based catalyst in the presence of less than 20% by weight of organic solvent based on the total weight of monomer, organic solvent, and resulting polymer, where the lanthanide-based catalyst is the combination of or reaction product of (a) a lanthanide compound, (b) an aluminoxane, (c) an organoaluminum compound other than an aluminoxane, and (d) a halogen-containing compound; and (2) contacting the reactive polymer with a functionalizing agent.

Abstract: A macromolecule including a polymer and a polyhedral radical chemically bonded to a terminus of the polymer provides numerous processing and performance advantages. Further functionalization of this macromolecule also is described as being advantageous in certain circumstances. Methods of providing, functionalizing, and utilizing the macromolecule also are provided.

Abstract: A release agent composition includes a poly(meth)acrylate (A) containing a structural unit (1) represented by the following formula (1); in which R1 represents hydrogen or a methyl group and R2 represents a long-chain alkyl group having 12 to 28 carbon atoms, a liquid polymer (B) and a crosslinking agent (C), wherein at least one of the poly(meth)acrylate (A) and the liquid polymer (B) has a reactive functional group, and the crosslinking agent (C) is a compound having a functional group capable of reacting with the reactive functional group.

Abstract: The present invention provides a modified conjugated diene polymer that is prepared by polymerization of a conjugated diene compound using a catalyst containing a lanthanoid rare earth element compound in an organic solvent and then modifying the resulting polymer having an active organic metal site with a modifier, wherein the modification efficiency is not less than 15% and the cis-1,4 bond content in the conjugated diene moiety measured by Fourier transform infrared spectroscopy satisfies the relationship (I): cis-1,4 bond content?98.00(%)??(I), or the modification efficiency is not less than 75% and the cis-1,4 bond content in the conjugated diene moiety measured by Fourier transform infrared spectroscopy satisfies the relationship (II): 94.00(%)?cis-1,4 bond content<98.00(%)??(II).

Abstract: A vulcanized rubber composition comprising the vulcanization product of a functional polymer, where the functional polymer is defined by the formula where R is selected from C1 to C6 trialkyl-silyl groups, C1 to C20 alkyl groups, C4 to C20 cycloalkyl groups, C6 to C20 aryl groups, thienyl, furyl, and pyridyl groups; and R may optionally have attached thereto any of the following functional groups: C1 to C10 alkyl groups, C6 to C20 aryl groups, C2 to C10 alkenyl groups, C3 to C10 non-terminal alkynyl groups, ethers, tert-amines, oxazolines, thiazolines, phosphines, sulfides, silyls, and mixtures thereof; where R1 is selected from C2 to C8 alkylene groups, where X is NR, and where ? is a polymer chain.

Abstract: The invention provides a elastomeric polymer composition comprising the reaction product of at least the following: i) a living anionic elastomeric polymer; ii) a silane modifier compound represented by the Formula I or Formula 2: (RIO)3Si—R4—S—SiR33, Formula 1 (R13O)3Si—R9-N(SiR10R11R12 Formula 2 iii) a modifier compound represented by one of the following Formulas 3 to 6: (R1O)x(R2)ySi—R4—S—SiR33, Formula 3 (R13O)P(R14)qSi—R9—N(SiR10R11R12)2 Formula 4, Formule 5, Formule 6

Abstract: The invention discloses improved processes to halogenate polymers. In particular, the invention discloses to improved processes to halogenate polymers made from C4-1012 isoolefins.

Abstract: Provided herein are composition comprising a farnesene interpolymer. The farnesene interpolymer can be derived from a farnesene and at least one vinyl monomer. In some embodiments, the mole percent ratio of the farnesene to the at least one vinyl monomer is from about 1:4 to about 100:1. In certain embodiments, the farnesene is ?-farnesene, ?-farnesene or a combination thereof. In some embodiments, the at least one vinyl monomer is ethylene, an ?-olefin such as styrene, or a substituted or unsubstituted vinyl halide, vinyl ether, acrylonitrile, acrylic ester, methacrylic ester, acrylamide or methacrylamide, or a combination thereof.

Abstract: Provided herein are farnesene interpolymers derived from a farnesene and at least one vinyl monomer. In certain embodiments, the farnesene is ?-farnesene, ?-farnesene or a combination thereof. In some embodiments, the at least one vinyl monomer is ethylene, an ?-olefin such as styrene, or a substituted or unsubstituted vinyl halide, vinyl ether, acrylonitrile, acrylic ester, methacrylic ester, acrylamide or methacrylamide, or a combination thereof.

Abstract: A rubber composition having an excellent adhesion with a brass-plated wire and an excellent heat aging resistance of a vulcanite containing (A) 100 parts by weight of a diene-based rubber, (B) 0.1 to 10 parts by weight of, as a vulcanization accelerator, an amine salt compound of a carboxylic acid group-containing disulfide having the formula (I): and (C) 0.1 to 10 parts by weight of, as a vulcanization agent, a cyclic sulfide compound having the formula (V): wherein R is a substituted or unsubstituted C2-C20 alkylene group, a substituted or unsubstituted C2-C20 oxyalkylene group or an aromatic ring-containing alkylene group, x is an integer of 2-6 on average and n is an integer of 1-30.

Abstract: A method for producing a modified conjugated diene polymer includes carrying out a modification reaction that reacts a modifier that includes a specific compound with a conjugated diene polymer having a cis-1,4-bond content of 98.5% or more and possessing an active end to introduce the modifier into the active end of the conjugated diene polymer to obtain a modified conjugated diene polymer. The modified conjugated diene polymer that exhibits excellent wear resistance, excellent mechanical properties, and reduced cold flow can be obtained by the method.

Abstract: The present invention concerns an amphiphilic polymeric material which comprises a straight or branched chain carbon-carbon backbone and a multiplicity of side chains attached to the backbone, wherein the side chains have formula (I). At least one of R1 and R2 is the group —C(O)Q; wherein Q comprises a hydrophilic polymeric group terminated with an amine. Chewing gum bases and chewing gum compositions comprising the amphiphilic polymeric material are provided.

Abstract: The present invention relates to a process for the selective hydrogenation of the carbon-carbon double bonds in a diene-based polymer latex using a water-soluble catalyst and simultaneously a water-insoluble co-catalyst.

Abstract: A thermoplastic elastomer composition containing (i) a thermoplastic resin, (ii) an elastomer component discontinuously dispersed in the thermoplastic resin and (iii) a molecular chain extender, wherein the dispersed state of the particles of the elastomer component dispersed in the matrix of the thermoplastic elastomer composition is stabilized.

Abstract: The present invention relates to a process for the hydrogenation of the carbon-carbon double bonds in a diene-based polymer latex in the absence of any organic solvent by a catalytically active system prepared in-situ based on a first main catalyst component and a secondary water-insoluble catalyst component.

Abstract: A rubber composition containing 100 parts by weight of a diene-based rubber, 20 to 120 parts by weight of silica, 3 to 15% by weight, based upon the weight of silica, of a sulfur-containing silane coupling agent and (A) 1,5-diazabicyclo[4,3,0]nonene-5 (DBN) having the formula (I): and/or a salt thereof or (B) 0.1 to 3.0 parts by weight of a compound having a piperidine skeleton having the formula (II) or a salt thereof and/or formula (III): wherein n indicates 3 or 5, R1 indicates CH or N and R2 indicates H or OH when R1 is CH, or H when R1 is N, and a melamine derivative of formula (IV): wherein R3 is a methoxymethyl group (—CH2OCH3) or methylol group (—CH2OH), the number of methoxymethyl groups is 3 to 6, and the number of methylol groups is 0 to 3, and/or polymer or copolymer resins of the same and a pneumatic tire using the same.

Abstract: A process for producing a conjugated diene-based polymer which comprises, in the first modification, modifying a conjugated diene-based polymer having active chain ends, which is obtained by polymerizing a diene-based monomer singly or with other monomers and has a content of a cis-1,4 unit of 75% by mole or greater in the conjugated diene portion of the main chain, by reacting the active chain ends with a hydrocarbyloxysilane compound and reacting the modified polymer with a specific compound such as a hydrocarbyloxysilane compound, and a rubber composition containing the polymer modified in accordance with the above process and, preferably, 10 to 100 parts by weight of silica and/or carbon black per 100 parts by weight of the rubber component containing the modified polymer, are provided. The rubber composition containing silica and/or carbon black exhibits improved fracture properties, abrasion resistance, low heat buildup property and excellent workability.

Abstract: The in-line repair operations in the automotive industry require high-temperature masking tapes which satisfy a particular profile of requirements. Hence such masking tapes must be temperature-stable and must have a high crosslinking potential. Masking tapes employed are tapes coated with thermally crosslinking natural rubber (NR) adhesives which have a crosslinker resin/phenolic resin component.

Abstract: Reduced hysteresis silica-containing black sidewall compounds having increased toughness properties are provided, as are methods for preparing the same. Tires comprising the black sidewall compounds prepared according to the present embodiments are also provided.

Abstract: The present invention provides a process for hydrogenation of a conjugated diene polymer comprising hydrogenating said polymer in the presence of hydrogen and a hydrogenation catalyst composition, wherein the catalyst composition comprising a titanium compound (A), a silyl hydride (B) selected from the group having a Si—H group and consisting of a monomeric silyl hydride, a polymeric silyl hydride, and a cyclic silyl hydride; and a compound (C), and conducting the hydrogenation in a middle to larger sized reactor having a capacity of 25 liters, with a temperature of 50° C. to 150° C., and a hydrogen pressure of 1 kg/cm2 to 20 kg/cm2.

Abstract: A functionalized polymer defined by the formula ?-R1-?, where ? is a polymer chain, R1 is a bond or a divalent organic group, and ? is a sulfur-containing heterocycle.

Abstract: A composition comprising alkylthio- or aryl(heteroyl)thio-substituted p-phenylenediamine, its method of preparation, and its use as an antidegradant in natural or synthetic rubber.

Abstract: A dual vessel reactor and a method of carrying out a reaction using a dual vessel reactor are provided using a non-condensable gas to substantially isolate the inner vessel from the outer vessel during the reaction and limit the heating of the outer vessel when steam from the inner vessel condenses on the interior surface of the outer vessel. By limiting the heating of the outer vessel through the condensation of the steam or other vapour from the inner vessel, the operating temperature of the outer vessel is kept below an upper threshold of the operating temperature of a seal used to seal the door in the outer vessel.

Abstract: Proposed is a process for the continuous hydrogenation of carbon-carbon double bonds in an unsaturated polymer to produce a hydrogenated polymer, said unsaturated polymer being based on a conjugated diolefin and at least one other copolymerizable monomer, in the presence of a homogeneous or heterogeneous catalyst, wherein said unsaturated polymer, hydrogen and said homogeneous or heterogeneous catalyst is passed through a multistage agitated reactor, comprising a cylindrical, elongated shell having closed ends and separated by baffles into a multiplicity of discrete chambers with access from one chamber to another through concentric circular openings, axially centered with said baffles and a continuous rotatable shaft extending concentric with said baffles within said shell with at least one impeller attached thereto positioned in each chamber, said continuous rotatable shaft and said circular openings providing annular openings and said hydrogenated polymer being withdrawn at the opposite end of the multista

Abstract: The present disclosure is directed to plasticized elastomer compositions and methods of preparing plasticized elastomers. The plasticized elastomer compositions comprise an elastomer, and an unsaturated linear or branched dicarboxylic acid diester plasticizer. The compositions are formed by combining the elastic polymer and reactive ester plasticizer with a curing agent to react at least 5% by weight of the diester plasticizer to the elastic polymer. The elastomer includes natural and synthetic rubbers, such as nitrile butadiene rubber, hydrogenated nitrile butadiene rubber, chlorinated polyethylene rubber, and ethylene propylene diene monomer rubber. The plasticized elastomer compositions disclosed herein provide improved solvent immersion properties, and are useful, for example, for hoses, belts, conveyor belts, motor mounts, gaskets, automotive drive train belts, including transmission belts, roofing compounds, and the like.

Abstract: The present invention relates to a method to produce highly branched polymers with a polyolefin backbone structure of ethylene and precise control of the nature of the branching. In particular, the distribution of branch length and number of branches can be more precisely controlled via the polymerization method of the present invention. The method comprises using anionic chemistry to make unsaturated polydienes with a well-defined, highly-branched structure, and then hydrogenating these polydienes to form highly branched or dendritic saturated hydrocarbon polymers. Highly branched or dendritic polyethylene, ethylene-propylene copolymer and atactic polypropylene are among the saturated hydrocarbon polymers that can be anionically synthesized via the proper selection of diene monomer type, coupling agent, and hydrogenation conditions.

Abstract: A method for preparing a functionalized polymer, the method comprising the steps of (i) polymerizing conjugated diene monomer by employing a lanthanide-based catalyst to form a reactive polymer, and (ii) reacting the reactive polymer with a hydrobenzamide compound.

Abstract: A functionalized polymer defined by the formula where ? is a polymer chain, R10 is a divalent organic group, and ? is a hydroxyl group, an alkoxyl group, or an amine group, where the amine group can be represented by the formula —NR2, where at least one R is a monovalent organic group and where the second R is hydrogen or a monovalent organic group, and where the alkoxyl group can be represented by the formula —OR?, where R? is a monovalent organic group.

Abstract: The present invention is directed to rubbery block polymers containing a polylactone, such as polycaprolactone, methods of making the same, and to rubber compounds containing those block polymers. The rubbery block polymer is an anionically polymerized block polymer defined by A-B, wherein A includes at least one type of polymerized conjugated diene monomer, a polymerized vinyl aromatic monomer, or a mixture thereof and wherein B is a polylactone, such as polycaprolactone, which is hydroxy terminated. The rubbery block polymer may be compounded so to provide, for example, a tire tread with desirable properties for use in an automobile tire. Such rubber compound, for example, can include the rubbery block polymer, an organosilane coupling agent, such as a bis(trialkoxysilyl) alkane, bis(trialkoxysilylalkyl) polysulfide, or mixtures thereof, and silica filler in specified amounts.

Abstract: Adhesive composition comprises a polyfarnesene and a tackifier. The polyfarnesene can be a farnesene homopolymer derived from a farnesene (e.g., ?-farnesene or ?-farnesene) or a farnesene interpolymer derived from a farnesene and at least a vinyl monomer. In some embodiments, the at least one vinyl monomer is ethylene, an ?-olefin such as styrene, or a substituted or unsubstituted vinyl halide, vinyl ether, acrylonitrile, acrylic ester, methacrylic ester, acrylamide or methacrylamide, or a combination thereof. The composition disclosed herein can be used as a hot melt adhesive, a pressure sensitive adhesive or the like.

Abstract: The present invention pertains to polyisobutylene urethane, urea and urethane/urea copolymers, to methods of making such copolymers and to medical devices that contain such polymers. According to certain aspects of the invention, polyisobutylene urethane, urea and urethane/urea copolymers are provided, which comprise a polyisobutylene segment, an additional polymeric segment that is not a polyisobutylene segment, and a segment comprising a residue of a diisocyanate. According to other aspects of the invention, polyisobutylene urethane, urea and urethane/urea copolymers are provided, which comprise a polyisobutylene segment and end groups that comprise alkyl-, alkenyl- or alkynyl-chain-containing end groups.

Abstract: A process for the preparation of a functionalized, coupled or starred block copolymer which is usable in a sulphur-cross-linkable rubber composition of reduced hysteresis in the cross-linked state, one at least of said blocks consisting of a polyisoprene and at least one other block consisting of a diene elastomer other than a polyisoprene the molar ratio of units originating from one or more conjugated dienes of which is greater than 15%.

Abstract: To modify a diene-based rubber whereby the dispersibility of silica and the abrasion resistance or heat buildup resistance are improved. A modified diene-based rubber obtained by adding and reacting, to a diene-based rubber (A), a compound (B) having, in the molecule thereof, a nitroxide free radical stable at an ordinary temperature and in the presence of oxygen, a radical initiator (C) and a radical polymerizable monomer (D) having a functional group in the molecule thereof and a rubber composition and pneumatic tire containing the same.

Abstract: A method for hydrogenation of a conjugated diene polymer is provided. The conjugated diene polymer in an inert organic solvent is brought into contact with hydrogen in the presence of a hydrogenation catalyst composition to selectively hydrogenate the unsaturated double bonds in the conjugated diene units of the conjugated diene polymer. The hydrogenation catalyst composition includes: (a) a titanium compound; (b) a compound represented by formula (II) or formula (III): wherein R is C1-C12 alkyl, C3-C12 cycloalkyl, aryl or alkyl aryl, M is C1-C12 alkyl, C1-C12 alkoxy, aryl, alkyl aryl, phenoxy or hydroxyl, and n=1˜3; and (c) a alkylaluminum compound.

Abstract: A production method of a low viscosity or low constant viscosity natural rubber obtained by treating a natural rubber latex by adding a water-soluble ammonium salt so as to decrease the metal content and spraying the treated natural rubber latex or the latex after addition of a constant viscosity agent into a pulse wave atmosphere for pulse drying to obtain solid rubber, a natural rubber obtained by the same, and a rubber composition including the same, whereby a low viscosity or low constant viscosity natural rubber having superior mechanical properties and low viscosity or low constant viscosity and superior processability, a natural rubber obtained by the same and a rubber composition containing the same were provided.

Abstract: The present invention relates to functionalizing agents that are particularly useful for functionalizing living rubbery polymers to make the polymer more compatible with fillers, such as carbon black and silica. These functionalizing agents are comprised of a boron containing compound having a structural formula selected from the group consisting of: wherein R is selected from the group consisting of hydrogen atoms, alkyl groups and aryl groups, wherein R1, R2, and R3 can be the same or different and are selected from the group consisting of alkyl groups, and aryl groups, and wherein R4 represents an alkylene group or a bridging aromatic group.

Abstract: The instant invention discloses a process for preventing contact discoloration of substrates coming into contact with elastomers and stabilizing elastomers to prevent oxidative, thermal, dynamic, light-induced and/or ozone-induced degradation, which comprises incorporating into the elastomers, or applying to these, at least a compound of the formula (I) wherein R1 is C1-C12alkyl, R2 is C1-C12alkyl, or R1 and R2 together with the carbon atom to which they are attached form an unsubstituted or with C1-C4alkyl substituted C5-C12cycloalkyl ring; R3 is hydrogen or —CH2—S(O)m—R5, R4 and R5 independently of each other are unsubstituted or with cyano substituted C5-C18-alkyl; C7-C9phenylalkyl, unsubstituted or with halogen, hydroxyl, cyano or C1-C4alkyl substituted phenyl or naphthyl; benzothiazolyl or —R6—CO2—R7, R6 is C1-C18alkylene, R7 is C1-C18alkyl, and m is 0, 1 or 2.

Abstract: A subject-matter of the present invention is a rubber composition intended for the manufacture of tyres or of tyre semi-finished products, based on at least one isoprene elastomer, an inorganic filler as reinforcing filler and a polyfunctional organosiloxane coupling agent capable of providing the bonding between the reinforcing inorganic filler and the isoprene elastomer, comprising per molecule, grafted to its silicon atoms, on the one hand at least one hydroxyl or hydrolysable functional group allowing it to be grafted to the reinforcing inorganic filler and, on the other hand, at least one group bearing at least one azodicarbonyl functional group —CO—N?N—CO— allowing it to be grafted to the isoprene elastomer.