A vulcanizable composition comprising rubber component, a filler, and a curing agent, where the rubber component includes a block copolymer of polybutadiene and polyisoprene, and where the block copolymer has a cis content of at least 90%.

A vulcanizable composition comprising rubber component, a filler, and a curing agent, where the rubber component includes a block copolymer of polybutadiene and polyisoprene, and where the block copolymer has a cis content of at least 90%.

Provided is a method for producing an organic tellurium compound that enables the production of an organic tellurium compound in high yield using metallic tellurium as a source material and produces less amount of side products. A method for producing an organic tellurium compound includes the steps of: (A) reacting metallic tellurium with a compound represented by a general formula (1) below; and (B) reacting a compound obtained by the step (A) with an organic halogen compound, the metallic tellurium having a copper content of less than 100 ppm,

M(R.sup.1)m   Formula (1)

where R.sup.1 represents an alkyl group having 1 to 8 carbon atoms, an aryl group or an aromatic heterocyclic group, M represents an alkali metal or an alkaline earth metal, m represents 1 when M is an alkali metal, and m represents 2 when M is an alkaline earth metal.

Provided is a method for producing an organic tellurium compound that enables the production of an organic tellurium compound in high yield using metallic tellurium as a source material and produces less amount of side products. A method for producing an organic tellurium compound includes the steps of: (A) reacting metallic tellurium with a compound represented by a general formula (1) below; and (B) reacting a compound obtained by the step (A) with an organic halogen compound, the metallic tellurium having a copper content of less than 100 ppm,

M(R.sup.1)m   Formula (1)

where R.sup.1 represents an alkyl group having 1 to 8 carbon atoms, an aryl group or an aromatic heterocyclic group, M represents an alkali metal or an alkaline earth metal, m represents 1 when M is an alkali metal, and m represents 2 when M is an alkaline earth metal.

Provided are: a tellurium-containing compound represented by Formula (M1); a polymer of a tellurium-containing compound represented by any one of Formulae (M1) to (M3); and a method for producing a polymer. Each of X.sup.1 to X.sup.3, Y.sup.1 to Y.sup.3 and Z.sup.1 to Z.sup.3 independently denotes a hydrogen atom, a fluorine atom, a chlorine atom, a bromine atom, an iodine atom, or an organic group having from 1 to 20 carbon atoms; at least one of X.sup.1, Y.sup.1, or Z.sup.1 is a fluorine atom; at least one of X.sup.2, Y.sup.2, or Z.sup.2 is a chlorine atom, a perfluoroalkyl group, a monovalent hydrocarbon group having an oxyperfluoroalkylene structure, or a phenyl group; and each of R.sup.1 to R.sup.3 denotes an organic group having from 1 to 20 carbon atoms.

##STR00001##

Provided are: a tellurium-containing compound represented by Formula (M1); a polymer of a tellurium-containing compound represented by any one of Formulae (M1) to (M3); and a method for producing a polymer. Each of X.sup.1 to X.sup.3, Y.sup.1 to Y.sup.3 and Z.sup.1 to Z.sup.3 independently denotes a hydrogen atom, a fluorine atom, a chlorine atom, a bromine atom, an iodine atom, or an organic group having from 1 to 20 carbon atoms; at least one of X.sup.1, Y.sup.1, or Z.sup.1 is a fluorine atom; at least one of X.sup.2, Y.sup.2, or Z.sup.2 is a chlorine atom, a perfluoroalkyl group, a monovalent hydrocarbon group having an oxyperfluoroalkylene structure, or a phenyl group; and each of R.sup.1 to R.sup.3 denotes an organic group having from 1 to 20 carbon atoms.

##STR00001##

A method broadening a molecular weight distribution and/or broadening a chemical composition distribution of the polyolefin product can include: polymerizing a feedstock in the presence of a metallocene catalyst in a loop reactor to produce a polyolefin product, the feedstock comprising two or more monomers; and adjusting a polymerization parameter selected from the group consisting of decreasing a recycle ratio, increasing a polymer concentration, increasing a LRSU number, and any combination thereof.

A method broadening a molecular weight distribution and/or broadening a chemical composition distribution of the polyolefin product can include: polymerizing a feedstock in the presence of a metallocene catalyst in a loop reactor to produce a polyolefin product, the feedstock comprising two or more monomers; and adjusting a polymerization parameter selected from the group consisting of decreasing a recycle ratio, increasing a polymer concentration, increasing a LRSU number, and any combination thereof.

In an aspect, a curable composition comprises an acid catalyzed urethane (meth)acrylate oligomer comprising an acid catalyst; a cyanoacrylate monomer; a metallocene compound; a free radical polymerization inhibitor; and an acidic anionic polymerization inhibitor. In yet another aspect, a method of making a cured composition comprises forming the curable composition; and curing the curable composition by exposing it to light to form the cured composition.

In an aspect, a curable composition comprises an acid catalyzed urethane (meth)acrylate oligomer comprising an acid catalyst; a cyanoacrylate monomer; a metallocene compound; a free radical polymerization inhibitor; and an acidic anionic polymerization inhibitor. In yet another aspect, a method of making a cured composition comprises forming the curable composition; and curing the curable composition by exposing it to light to form the cured composition.