Abstract: A renewable solvent composition having a high i-paraffin content of at least 91.0 wt.-% and a boiling in a range of from 150° C. to 260° C. is disclosed. The solvent composition can provide a good balance between solvency power and cold properties and is usable in a broad application field.

Abstract: A waterless hand cleaner that pulls dirt and debris particles out of the crevices and pores of skin, thus removing harmful contaminants and bacteria along with it. The hand cleaner is a flexible sticky hand cleaner sheet with a sticky adhesive that secures and removes dirt and exfoliates loose and/or dead skin from the palms and fingers of the user's hand. The hand cleaner sheets can be dispensed from a roll, or dispensed as individual sheets.

Abstract: Provided herein are organic solvent-based processes for the isolation of purified natural rubber from non-Hevea plants. The processes are particularly useful with plant matter that comprises at least 90% by weight roots sourced from Taraxacum kok-saghyz (Russian dandelion), Scorzonera tau-saghyz (Tau-Saghyz), Scorzonera uzbekistanica, and combinations thereof. Also provided herein is a purified non-Hevea rubber product containing 100 phr of rubber sourced from Taraxacum kok-saghyz, Scorzon-era tau-saghyz, Scorzonera uzbekistanica, and combinations thereof, having a specified purity level. Additionally provided are sulfur-vulcanizable rubber compounds and sulfur-vulcanized rubber compounds that incorporate 10-100 phr of purified non-Hevea rubber product sourced from Taraxacum kok-saghyz, Scorzonera tau-saghyz, Scorzonera uzbekistanica, and combinations thereof, having a specified purity level.

Abstract: Provided is a rubber composition including a rubber component. The rubber component contains at least a polymer that is a synthesized polyisoprene or an isoprene copolymer and that has 20% or less gel fraction.

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: It has been found that certain cells in culture can convert more than about 0.002 percent of the carbon available in the cell culture medium into isoprene. These cells have a heterologous nucleic acid that (i) encodes an isoprene synthase polypeptide and (ii) is operably linked to a promoter. The isoprene produced in such a cultured medium can then be recovered and polymerized into synthetic rubbers and other useful polymeric materials. The synthetic isoprene containing polymers of this invention offer the benefit of being verifiable as to being derived from non-petrochemical based resources. They can also be analytically distinguished from rubbers that come from natural sources. The present invention more specifically discloses a polyisoprene polymer which is comprised of repeat units that are derived from isoprene monomer, wherein the polyisoprene polymer has ?13C value of greater than ?22‰.

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: Provided herein are organic solvent-based processes for the removal of rubber from non-Hevea plants such as guayule shrubs. By the use of the processes, solid purified rubber can be obtained that contains 0.05-0.5 weight % dirt, 0.2-1.5 weight % ash, and 0.1-4 weight % resin (when it has been dried so as to contain 0.8 weight % volatile matter).

Abstract: The polymer of the present invention is a synthesized polyisoprene or an isoprene copolymer. The polymer has a number average molecular weight (Mn) of 1.5 million or more when measured by using gel permeation chromatography (GPC).

Abstract: The invention provides highly cross-linked polydicyclopentadiene matrices and methods for using such matrices to separate components having varying cross-sectional areas.

Abstract: This invention relates to compositions and methods for producing polymers of isoprene derived from renewable resources, such as isoprene produced from cultured cells that use renewable carbon sources. A starting isoprene composition, such as a bioisoprene composition, is distinguished from petroleum based isoprene by its purity profile (such as lower levels of certain C5 hydrocarbons other than isoprene, presence of certain compounds associated with the biological process for production) and the relative content of the carbon isotopes. Polymers obtained by polymerization of such starting isoprene composition according to this invention, such as a polyisoprene homopolymer or a copolymer having repeat units that are derived from isoprene, are distinguishable from isoprene containing polymers from petrochemical resources.

Abstract: The present invention provides a polar group-containing copolymer which can provide a rubber composition and a winter tire achieving the abrasion resistance, performance on ice, and handling stability on dry roads in a balanced manner. The present invention relates to a polar group-containing copolymer obtainable by copolymerizing a conjugated diene compound and a polar group-containing vinyl compound, wherein the polar group-containing vinyl compound is a compound that has a polymerizable unsaturated bond and a polar group, wherein any one of carbon atoms forming the polymerizable unsaturated bond and a carbon atom linked to the polar group are connected to each other via at least one carbon atom, and wherein a cis content of the double bond portion of the conjugated diene compound in the polar group-containing copolymer is 80 mol % or more.

Abstract: A bis-imine pyridine complex of lanthanides having general formula (I). Said bis-imine pyridine complex of lanthanides having general formula (I) can be advantageously used in a catalytic system for the (co)polymerization of conjugated dienes.

Abstract: The present invention relates to a method of reducing type IV rubber allergy of synthetic rubber latex products caused by chemical residues remaining after manufacture of the synthetic rubber products by reducing levels of chemical residues found for said products, said method comprising the steps of: subjecting said products to a wash in a strong alkaline solution to remove the chemical residues remaining after manufacture of the rubber latex products, and a system for reducing type IV allergenicity of synthetic rubber products caused by chemical residues remaining after manufacture of the synthetic rubber latex products by reducing residual levels of chemical residues found for said products, and a product, such as a glove, manufactured from synthetic rubber latex processed in accordance with the method and/or using the system.

Abstract: Disclosed are a polybutadiene having a controlled microstructure, a narrow molecular weight distribution, minimal gel content, and a low APHA color, a modified polybutadiene, producing methods for both, and a rubber-reinforced styrene resin composition using the same. The polybutadiene of the present invention is characterized in that the ratio (Tcp/ML1+4) of a 5% toluene melting viscosity (Tcp) measured at 25° C. and the Mooney viscosity (ML1+4) at 100° C. is 2.0 or higher, the molecular weight distribution (Mw/Mn) is 2.80 or less, the gel content is 0.06 wt % or less, and the APHA color is 20 or less.

Abstract: Provided are methods of preparing polymers, such as polyisoprene, polybutadiene, polypiperylene, polycyclohexadiene, poly-?-farnesene, or poly-?-myrcene, using iron complexes. Also provided are novel iron complexes, pre-catalysts, intermediates, and ligands useful in the inventive polymerization system.

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 features compositions and methods for producing polymers of isoprene derived from renewable resources such as isoprene produced from cultured cells that use renewable carbon sources. A starting isoprene composition, such as a bioisoprene composition, is distinguished from petroleum based isoprene by the purity profile (such as lower levels of certain C5 hydrocarbons other than isoprene, presence of certain compounds associated with the biological process for production) and the relative content of the carbon isotopes. Polymers obtained by polymerization of such starting isoprene composition according to this invention, such as a polyisoprene homopolymer or a copolymer having repeat units that are derived from isoprene, are distinguishable from isoprene containing polymers from petrochemical resources.

Abstract: It has been found that certain cells in culture can convert more than about 0.002 percent of the carbon available in the cell culture medium into isoprene. These cells have a heterologous nucleic acid that (i) encodes an isoprene synthase polypeptide and (ii) is operably linked to a promoter. The isoprene produced in such a cultured medium can then be recovered and polymerized into synthetic rubbers and other useful polymeric materials. The synthetic isoprene containing polymers of this invention offer the benefit of being verifiable as to being derived from non-petrochemical based resources. They can also be analytically distinguished from rubbers that come from natural sources. The present invention more specifically discloses a polyisoprene polymer which is comprised of repeat units that are derived from isoprene monomer, wherein the polyisoprene polymer has ?13C value of greater than ?22‰.

Abstract: It has been found that certain cells in culture can convert more than about 0.002 percent of the carbon available in the cell culture medium into isoprene. These cells have a heterologous nucleic acid that (i) encodes an isoprene synthase polypeptide and (ii) is operably linked to a promoter. The isoprene produced in such a cultured medium can then be recovered and polymerized into synthetic rubbers and other useful polymeric materials. The synthetic isoprene containing polymers of this invention offer the benefit of being verifiable as to being derived from non-petrochemical based resources. They can also be analytically distinguished from rubbers that come from natural sources. The present invention more specifically discloses a polyisoprene polymer which is comprised of repeat units that are derived from isoprene monomer, wherein the polyisoprene polymer has ?13C value of greater than ?22‰.

Abstract: This invention relates to a functionalized co-oligomer having an Mn of 300 to 30,000 g/mol comprising 10 to 90 mol % propylene and 10 to 90 mol % of ethylene, wherein the oligomer has at least X % allyl chain ends, where: 1) X=(?0.94(mole % ethylene incorporated)+100), when 10 to 60 mole % ethylene is present in the co-oligomer, and 2) X=45, when greater than 60 and less than 70 mole % ethylene is present in the co-oligomer, and 3) X=(1.83*(mole % ethylene incorporated)?83), when 70 to 90 mole % ethylene is present in the co-oligomer. This invention also relates to a functionalized homo-oligomer, comprising propylene, wherein the oligomer has: at least 93% allyl chain ends, an Mn of about 500 to about 20,000 g/mol, an isobutyl chain end to allylic vinyl group ratio of 0.8:1 to 1.2:1.0, and less than 100 ppm aluminum. This invention also relates to a process of making functionalized homo- or co-oligomer, comprising propylene, wherein the productivity is greater than 4500 g/mmol Hf (or Zr)/hour.

Abstract: An isoprene or butadiene cis 1,4-selective polymerization catalyst system together with its polymerization method is provided. This catalyst system is composed of NCN-imine pincer type rare earth metal complex of formula [2,6-(CH?N—R1)2-4-R2-1-C6H2]LnX2(THF)n and alkylating reagent. In an hydrocarbon solvent or under bulk conditions, at a polymerization temperature in a range of ?20-120° C., the conjugated diene is polymerized by using the catalyst system, to produce polyisoprene and polybutadiene having controllable number-average molecular weight, molecular weight distribution of 3.0 or less than, and cis 1,4-content of 95% or more, even 99% or more. The crude rubber and vulcanized rubber of the polyisoprene have high strength, stretching crystallization capability and transparency.

Abstract: The invention provides highly cross-linked polydicyclopentadiene matrices and methods for using such matrices to separate components having varying cross-sectional areas.

Abstract: The present invention is directed to compositions of a linear polyol and a salt of a crosslinked cation exchange polymer comprising a fluoro group and an acid group. These compositions are useful to bind potassium in the gastrointestinal tract.

Abstract: The present invention provides a polar group-containing copolymer which can provide a rubber composition and a winter tire achieving the abrasion resistance, performance on ice, and handling stability on dry roads in a balanced manner. The present invention relates to a polar group-containing copolymer obtainable by copolymerizing a conjugated diene compound and a polar group-containing vinyl compound, wherein the polar group-containing vinyl compound is a compound that has a polymerizable unsaturated bond and a polar group, wherein any one of carbon atoms forming the polymerizable unsaturated bond and a carbon atom linked to the polar group are connected to each other via at least one carbon atom, and wherein a cis content of the double bond portion of the conjugated diene compound in the polar group-containing copolymer is 80 mol % or more.

Abstract: In the production of isobutylene-based elastomers the product obtained from the polymerization process is often in the form of a stream. Described herein are an apparatus and a process for removal of hydrocarbon liquids from the elastomer. The process comprises the steps of obtaining a stream comprising hydrocarbon liquids, either solvents or diluents, and an isobutylene-based elastomer; passing the stream through a kneader to volatize the hydrocarbon liquids from the elastomer.

Abstract: A polymer is described that is stable in the presence of a free-radical initiator, but which cures when subjected to a small amount of free-radical initiator when in the presence of a co-agent. The polymer's main chain comprises polymerized olefin monomers, isobutylene-co-isoprene, or isobutylene-co-methylstyrene. The polymer's side chains comprise a functionality that crosslinks when subjected to a free-radical initiator in the presence of a co-agent. Suitable co-agents include bis-maleimide. Methods for preparing and for crosslinking such polymers are described. Cured product is halo-free and has low odour.

Abstract: The present disclosure describes systems and methods that utilize an extendable tracheal tube system. The extendable tracheal tube system includes an extendable tracheal tube having a distal end portion and a proximal end portion. The proximal end portion and the distal end portion of the extendable tracheal tube are capable of moving axially relative to each other. An obturator is also provided that is capable of aiding in the intubation and/or extubation of the extendable tracheal tube. The use of the extendable tracheal tube system and methods enables the secure attachment of the extendable tracheal tube to a patient airway while allowing for certain movements of the patient, such as neck and head movements.

Abstract: It has been found that certain cells in culture can convert more than about 0.002 percent of the carbon available in the cell culture medium into isoprene. These cells have a heterologous nucleic acid that (i) encodes an isoprene synthase polypeptide and (ii) is operably linked to a promoter. In some cases, these cells are cultured in a culture medium that includes a carbon source, such as, but not limited to, a carbohydrate, glycerol, glycerine, dihydroxyacetone, one-carbon source, oil, animal fat, animal oil, fatty acid, lipid, phospholipid, glycerolipid, monoglyceride, diglyceride, triglyceride, renewable carbon source, polypeptide (e.g., a microbial or plant protein or peptide), yeast extract, component from a yeast extract, or any combination of two or more of the foregoing. The isoprene produced in such a cultured medium can then be recovered and polymerized into synthetic rubbers and other useful polymeric materials.

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

Abstract: The invention relates to a process for extruding plastic compositions, in particular polymer melts and mixtures of polymer melts, above all thermoplastics and elastomers, particularly preferably polycarbonate and polycarbonate blends, also with the incorporation of other substances such as for example solids, liquids, gases or other polymers or other polymer blends with improved optical characteristics, with the assistance of a multi-screw extruder with specific screw geometries.

Abstract: Methods and apparatus for the purification of isoprene, such as the purification of a bioisoprene composition from fermentor off-gas. The apparatus includes two columns that process the fermentor off-gas, which includes isoprene and various impurities. A solvent is added to the off-gas in the first column, and the isoprene is stripped from the solvent in the second column. Also provided is a downstream further purification process. Also provided are the resulting purified isoprene compositions.

Abstract: Randomly branched polymers, such as homopolymers, copolymers, block copolymers and functionalized polymers are disclosed which may be formed by polymerizing a polymerizable monomer, such as styrene with a dithioester chain transfer agent which includes a polymerizable group. The reaction may be performed in one pot. The randomly branched polymer can have high molecular weight and broad molecular weight distribution.

Abstract: The present invention provides 1) a complex comprising a mono-anionictridentate ligand, represented by the following general formula (I); 2) a polymerization catalyst composition, comprising the complex; and 3) a cis-1,4-isoprene polymer, a cis-1,4-butadiene polymer, a cis-1,4-isoprene-styrene copolymer, a cis-1,4-butadiene-styrene copolymer, a cis-1,4-butadiene-cis-1,4-isoprene copolymer, and a cis-1,4-butadiene-cis-1,4-isoprene-styrene copolymer, each of which has high-cis-1,4 content in a micro structure and a sharp molecular-weight distribution.

Abstract: The present invention is directed to a catalyst system for synthesizing rubbery polymers, such as polybutadiene rubber, styrene-butadiene rubber, isoprene-butadiene rubber, or styrene-isoprene-butadiene rubber, that are amine functionalized and have a high trans microstructure. The catalyst system, in one embodiment, includes (a) an organolithium amine compound, (b) a group IIa metal salt of an amino glycol or a glycol ether, (c) an organoaluminum compound, and optionally (d) an amine compound. The amine functionalized rubbery polymers can be utilized in tire tread rubbers where the rubbery polymers may provide desirable wear properties without substantially sacrificing other performance characteristic(s), e.g., traction properties.

Abstract: An isoprene-based polymer cyclized product obtained by cyclization of an isoprene-based polymer containing structural units expressed by the general formula (1) and having a ratio of content of the structural units to all repeating structural units of 60 mol % or more; an alicyclic polymer obtained by hydrogenation of 50% or more of the carbon-carbon double bonds of the isoprene-based polymer; and an optical resin comprising the isoprene-based polymer cyclized product and alicyclic polymer. (in the general formula (1), R1 indicates a C1 to C10 alkyl group).

Abstract: An apparatus attached to the tree of a saddle in lieu of a conventional saddle horn consisting of a post of rectangular prismatic configuration with a receiving chamber for insertion of a quick release locking pin, a cap with a quick release locking pin attached to and protruding from the bottom thereof that may be detached and reattached to the post within seconds, and a dally device with a rectangular prismatic central void of complimentary dimensions to the post, having a hyperboloid external configuration and being symmetrical in both the horizontal and vertical planes such that the device may be rotated and/or inverted about the post so that it may be quickly and easily manipulated to numerous positions to generate even wear about the exterior, thus increasing the longevity of the device and improving the safety and effectiveness of dallying.

Abstract: A cationic polymerization process for isoolefins using a zinc halide initiator. The zinc halide initiator is added to a solution of the isoolefin in a suitable solvent, preferably a halocarbon solvent. Polymerization reactions are normally conducted at temperatures high enough to allow the zinc halide initiator to dissolve in the solution. An alkyl halide activator may optionally be used and is preferably added to the solution prior to the zinc halide initiator. A multiolefin may optionally be present in the solution. The process is particularly useful in the formation of isoolefin homopolymers and co-polymers of isoolefins and multiolefins, such as butyl rubber.

Abstract: 3,4-isoprene-based polymer having high isotacticity can be produced by polymerizing an isoprene compound using a complex represented by the general formula (A) and a catalyst activator: wherein R1 and R2 independently represent an alkyl group, a cyclohexyl group, an aryl group or an aralkyl group; R3 represents an alkyl group, an alkenyl group, an alkynyl group, an aryl group, an aralkyl group, an aliphatic, aromatic or cyclic amino group, a phosphino group, a boryl group, an alkylthio or arylthio group, or an alkoxy or aryloxy group; M represents a rare earth element selected from Sc, Y, and La to Lu with promethium (Pm) excluded; Q1 and Q2 independently represent a monoanionic ligand; L represents a neutral Lewis base; and w represents an integer of 0 to 3.

Abstract: The present invention is directed to a catalyst system for synthesizing rubbery polymers, such as polybutadiene rubber, styrene-butadiene rubber, isoprene-butadiene rubber, or styrene-isoprene-butadiene rubber, that are amine functionalized and have a high trans or high vinyl microstructure. The catalyst system, in one embodiment, includes an organolithium amine compound, and one or more of (a) a group IIa metal salt of an amino glycol or a glycol ether, (b) an organoaluminum compound, or (c) an amine compound. The amine functionalized rubbery polymers can be utilized in tire tread rubbers where the rubbery polymers may provide desirable wear properties without substantially sacrificing other performance characteristic(s), e.g., traction properties.

Abstract: This invention relates to a novel polymerization initiator capable of introducing an active amino proton into a polymerization starting terminal without losing polymerization activity, and a novel modified conjugated diene polymer being excellent in the interaction with a filler and capable of improving a low heat buildup of a rubber composition, and more particularly to a polymerization initiator being a diamine compound in which one amino group is protected with a silylating agent and an active proton of the other amino group is replaced with an alkali metal or an alkaline earth metal, and a modified conjugated diene polymer which can be produced by using such a polymerization initiator and is a homopolymer of a conjugated diene compound or a copolymer of a conjugated diene compound and an aromatic vinyl compound and has a residue derived from a diamine compound at its polymerization starting terminal.

Abstract: Provided herein are compositions comprising a polyfarnesene. 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.

Abstract: The present invention provides a novel dicarbanionic initiator of formula (I). The present process further provides a process for the preparation of dicarbanionic initiator of formula (I) comprising reacting 1-bromo-4-(4?-bromophenoxy)-2-pentadecyl benzene of formula (II) with alkyllithium compound for an effecting halogen-lithium exchange reaction of 1-bromo-4-(4?-bromophenoxy)-2-pentadecyl benzene with sec-butyllithium in the presence of a non polar solvent, at a temperature in the range of 0 to 25° C. and its use as an initiator for the synthesis of telechelic polydienes and polystyrenes and SBS or SIS triblock copolymers.

Abstract: Lithium-terminated polymers of one or more conjugated dienes and of one or more mono alkenyl arenes are coupled by reaction with an alkoxy silane coupling agent having the formula Rx—Si—(OR?)y, where x is 0 or 1, x+y=4, R and R? are the same or different, R is selected from aryl hydrocarbon radicals, linear alkyl hydrocarbon radicals and branched alkyl hydrocarbon radicals, and R? is selected from linear and branched alkyl hydrocarbon radicals, such that the resulting polymer composition contains less than about ten weight percent of uncoupled polymer diblock. The polymer compositions are subsequently selectively hydrogenated, and are useful in a variety of compounds and end use applications.

Abstract: Stretch films are disclosed, the films having at least one layer formed of or including a polyethylene copolymer and having a natural draw ratio of at least 250%, a tensile stress at the natural draw ratio of at least 22 MPa, and a tensile stress at second yield of at least 12 MPa. In some embodiments, the polyethylene copolymer can have a CDBI of at least 70%, a melt index I2.16 of from 0.1 to 15 g/10 min., a density of from 0.910 to 0.940 g/cm3, a melt index ratio I21.6/I2.16 of from 30 to 80, and an Mw/Mn ratio of from 2.5 to 5.5. The stretch films are particularly useful in bundling and packaging applications.

Abstract: Disclosed is a method of producing a polyolefin composition comprising contacting a metallocene pre-catalyst with a substoichiometric amount of a co-catalyst; adding a first olefin monomer; and polymerizing the first monomer for a time sufficient to form the polyolefin. The method allows for the use of a minimum amount of activating co-catalyst, and allows for the production of stereoregular and non-stereoregular polyolefins. The use of configurationally stable metallocene pre-catalysts allows for the production of monomodal isotactic polyolefins having narrow polydispersity. The use of configurationally unstable metallocene pre-catalysts allows for the production of monomodal atactic polyolefins having narrow polydispersity. The method of the present invention optionally further comprises contacting the polyolefin with a second amount of said co-catalyst; adding a second olefin monomer; polymerizing said second olefin monomer to form a block-polyolefin composition.

Abstract: A halogenated butyl polymer having improved properties, the butyl polymer derived from a monomer mixture comprising a C4 to C8 monoolefin monomer, a C4 to C14 multiolefin monomer and a styrenic monomer with a catalyst system to produce the butyl polymer. The improved properties include faster cure, higher maximum torque, higher delta torque, relatively stable modulus over time, improved hot air aging properties and improved aged flexure properties. These improved properties are believed to result from direct interaction between the styrenic moieties in the polymer backbone with a crosslinking agent added to vulcanize the halogenated butyl rubber.

Abstract: The present invention relates to resin compositions for radical curing comprising a component (I) containing reactive carbon-carbon unsaturations and a component (II) containing XH-groups, with X not being C or O, which resin compositions (a) are substantially free of photoinitiators; (b.) have an average number of reactive carbon-carbon unsaturations of component (I) higher than 2; (c) have an average number of XH-groups of component (II) equal to or higher than 2, with at least one of the XH-groups of the XH-component being a thiol group, and; (d) whereby at least one of the average numbers of (b) and (c) is higher than 2; (e) and at most 5 mol % of the reactive unsaturations is capable of undergoing homopolymerisation; (f) respectively is present in the form of a mono-ene functional alkylene; and (g) the molar ratio of the XH-groups and of the reactive unsaturations is in the range of from 4:1 to 1:4; with the proviso that the RU component is not tris-(norborn-5-ene-2-carboxy) propoxypropane.

Abstract: A rubber composition used for an inner liner layer that reduces an amount of air permeation, lessens density of the rubber composition and does not lower fracture property of the rubber composition is provided. The rubber composition is used for an inner liner layer of an inner surface of a tire and comprises 1 to 30 parts by weight of thermal expansion microcapsules based on 100 parts by weight of rubber components containing a butyl rubber in an amount of not less than 80% by weight, wherein an outer shell portion of independent thermal expansion microcapsules is made of a thermoplastic resin, and an average particle diameter of the thermal expansion microcapsules is 10 to 95 ?m.

Abstract: The present invention provides 3,4-isoprene-based polymer with high regioregularity, in particular high tacticity. Specifically, the present invention provides an isoprene-based polymer, including a structural unit represented by Formula (I) in Claims, wherein the isotacticity of an arrangement of the structural units is 99% mmmm or more in terms of pentad content. Further, the present invention provides a production method for the isoprene-based polymer, which comprises polymerizing an isoprene-based compound in the presence of a polymerization catalyst containing a complex represented by the following Formula (A) in Claims.