Abstract: Provided is a copolymer of a conjugated diene compound and a non-conjugated olefin, the copolymer being a block copolymer, the conjugated diene compound unit having 1,2 adduct (including 3,4 adduct) content of 5% or less or the conjugated diene compound unit having a cis-1,4 bond content of more than 92%, in which preferred examples of the conjugated diene compound include 1,3-butadiene and isoprene, and preferred examples of the non-conjugated olefin include ethylene, propylene, and 1-butene.

Abstract: Provided is a block copolymer of a conjugated diene compound and a non-conjugated olefin, a rubber composition including the block copolymer, a crosslinked rubber obtained by crosslinking the rubber composition, and a tire using the rubber composition or the crosslinked rubber composition. The copolymer of the present invention is a block copolymer of a conjugated diene compound and a non-conjugated olefin, the copolymer having a peak area in a temperature range in a range of 70° C. to 110° C. that accounts for at least 60% of a peak area in a range of 40° C. to 140° C. and a peak area in a range of 110° C. to 140° C. that accounts for 20% or less of a peak area in a range of 40° C. to 140° C., the peak areas being measured by the differential scanning calorimetry (DSC) according to JIS K 7121-1987.

Abstract: A copolymer having properties (durability (fracture resistance, abrasion resistance, and crack-growth resistance)) similar to those of natural rubber and a method of producing the copolymer are provided. An isoprene copolymer has a styrene block or a butadiene block at a terminal thereof, wherein styrene monomers account for less than 5 mol % of all monomers forming the isoprene copolymer having the styrene block; butadiene monomers account for 10 mol % or less of all monomers forming the isoprene copolymer having the butadiene block; and cis-1,4 bond content of a portion derived from isoprene accounts for at least 95% in total.

Abstract: An object of the present invention is to provide a polymer composition having properties resembling those of natural rubber, e.g. good durability (fracture resistance, wear resistance, and crack growth resistance), and a method for manufacturing the polymer composition. Specifically, the present invention provides a method for manufacturing a polymer composition including a mixture of polyisoprene and polystyrene/polybutadiene, comprising: polymerizing styrene monomer or butadiene monomer in the presence of a catalyst to synthesize polystyrene or polybutadiene; adding isoprene monomer to the polystyrene or polybutadine thus synthesized, to synthesize polyisoprene and thus generate said mixture, wherein content of the styrene monomer or the butadiene monomer is set to be 10 mol % or less with respect to the total quantity of the styrene monomer/the butadiene monomer and the isoprene monomer.

Abstract: In a copolymer of a conjugated diene compound and a non-conjugated olefin, the conjugated diene unit has a cis-1,4 bond content of greater than 70.5% and the non-conjugated olefin is contained in an amount of 10 mol % or more.

Abstract: Provided is a copolymer of a conjugated diene compound and a non-conjugated olefin, the copolymer being a random copolymer including randomly arranged monomer units of the conjugated diene compound and of the non-conjugated olefin, in which the non-conjugated olefin is preferably an acyclic olefin, the non-conjugated olefin preferably has 2 to 10 carbon atoms, and specific examples of the non-conjugated olefin preferably include ethylene, propylene, and 1-butene.

Abstract: A polymerization catalyst composition that, without accompanying excessive gelation, allows efficient synthesis of high molecular weight polyisoprene under industrial conditions is provided. The polymerization catalyst composition contains: a rare earth element compound (component (A)) represented by the following general formula (i): M-(NQ1)(NQ2)(NQ3)??(i); at least one (component (B)) selected from an ionic compound and a halogen compound; and a compound (component (C)) represented by the following general formula (X): YR1aR2bR3c??(X).

Abstract: A method for producing a polymer containing silica that does not involve long kneading time, and a polymer composition having an intended low heat generation property. A polymerization catalyst composition is produced by mixing and aging a second element and a third element, and then adding a first element to the mixture to react the first element with the mixture. The first element contains a compound that contains a rare earth metal element, the second element contains a compound represented by the following formula (X), and the third element contains silica. YR1aR2bR3c (X) (In the formula, Y is a metal; R1 and R2 are hydrogen atoms or hydrocarbon groups; and R3 is a hydrocarbon group, and R1, R2, and R3 are the same as or different from each other, a, b, and c are 0 or 1.

Abstract: The present invention provides a copolymer of a conjugated diene compound and a non-conjugated olefin that is used for manufacturing a rubber excellent in crack growth resistance, heat resistance and ozone resistance and that includes a cis-1,4 bond at a unit derived from the conjugated diene compound, a rubber composition containing the copolymer, a rubber composition for tire treads using the rubber composition for tire tread members, a crosslinked rubber composition obtained by crosslinking the rubber composition, and a tire using the rubber composition or the crosslinked rubber composition. In the copolymer of a conjugated diene compound and a non-conjugated olefin, the cis-1,4 bond content of a unit derived from the conjugated diene compound is more than 92%.

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 present invention provides a method for controlling the chain structure of a copolymer. The disclosed method is capable of controlling the arrangement of monomeric units in a copolymer, and of selectively forming a random copolymer, tapered copolymer, multiblock copolymer and block copolymer. In the method for controlling the chain structure of a copolymer of a conjugated diene compound and a non-conjugated olefin, the introduction of the conjugated diene compound is controlled in the presence of the non-conjugated olefin so as to control the chain structure of the copolymer.

Abstract: The present invention provides a copolymer of a conjugated diene compound and a non-conjugated olefin, in which the conjugated diene unit has cis-1,4 bonds and the non-conjugated olefin contains many ethylene structures. In a copolymer of a conjugated diene compound and an unconjugated olefin other than the conjugated diene compound, the conjugated diene unit has a cis-1,4 bond content of 50% or more and the unconjugated olefin is contained in an amount of 20 mol % or more.

Abstract: The present invention provides a random copolymer that is used for manufacturing a tire having excellent rollability and wear resistance and that includes randomly arranged monomer units of a conjugated diene compound and of a non-conjugated olefin, a rubber composition containing the random copolymer, a cross-linked rubber composition obtained by crosslinking the rubber composition, and a tire manufactured by using the rubber composition or the cross-linked rubber composition. A copolymer of a conjugated diene compound and a non-conjugated olefin, including a random copolymer having randomly arranged monomer units of the conjugated diene compound and of the non-conjugated olefin, and containing, by more than 30 mol %, a unit derived from the conjugated diene compound.

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 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: This invention relates to a method for producing a copolymer of a conjugated diene compound and an unconjugated olefin other than the conjugated diene compound having a high cis-1,4 bond content of a conjugated diene compound portion, and more particularly to a method for producing a copolymer characterized by comprising a step of polymerizing a conjugated diene compound and an unconjugated olefin other than the conjugated diene compound in the presence of a polymerization catalyst composition including at least one complex selected from a metallocene complex represented by the following general formula (I): (wherein M is a lanthanoid element, scandium or yttrium, and CpR is independently a non-substituted or substituted indenyl, and Ra-Rf are independently an alkyl group having a carbon number of 1-3 or a hydrogen atom, and L is a neutral Lewis base, and w is an integer of 0-3) and so on.

Abstract: This invention relates to a method for producing a copolymer of a conjugated diene compound and an unconjugated olefin other than the conjugated diene compound having a high cis-1,4 bond content of a conjugated diene compound portion, and more particularly to a method for producing a copolymer characterized by comprising a step of polymerizing a conjugated diene compound and an unconjugated olefin other than the conjugated diene compound in the presence of a polymerization catalyst composition including at least one complex selected from a metallocene complex represented by the following general formula (I): (wherein M is a lanthanoid element, scandium or yttrium, and CpR is independently a non-substituted or substituted indenyl, and Ra-Rf are independently an alkyl group having a carbon number of 1-3 or a hydrogen atom, and L is a neutral Lewis base, and w is an integer of 0-3) and so on.

Abstract: Provided is a block copolymer of a conjugated diene compound and a non-conjugated olefin, a rubber composition including the block copolymer, a crosslinked rubber obtained by crosslinking the rubber composition, and a tire using the rubber composition or the crosslinked rubber composition. The copolymer of the present invention is a block copolymer of a conjugated diene compound and a non-conjugated olefin, the copolymer having a peak area in a temperature range in a range of 70° C. to 110° C. that accounts for at least 60% of a peak area in a range of 40° C. to 140° C. and a peak area in a range of 110° C. to 140° C. that accounts for 20% or less of a peak area in a range of 40° C. to 140° C., the peak areas being measured by the differential scanning calorimetry (DSC) according to JIS K 7121-1987.

Abstract: The method for manufacturing a polymer of the present invention is a method for manufacturing a polymer where a hydroxy group is added to a terminal of either one of a homopolymer of a non-conjugated olefin, a homopolymer of a conjugated diene compound, and a copolymer of a conjugated diene compound and a non-conjugated olefin, the method comprising: a first reaction step of reacting a hydrocarbon containing at least either one of the non-conjugated olefin and the conjugated diene compound with an organic aluminum compound, using a rare earth element compound-containing catalyst; a second reaction step of reacting a first reactant obtained from the first reaction step with oxygen; and a third reaction step of reacting a second reactant obtained from the second reaction step with at least either one of water and alcohol.

Abstract: Disclosed are a metallocene complex represented by the general formula (I), (II) or (III), and a polymerization catalyst composition containing such a metallocene complex. In the formulae (I), (II) and (III), M represents a lanthanoid element, scandium or yttrium; CpR independently represents an unsubstituted or substituted indenyl; CpR? represents an unsubstituted or substituted cyclopentadienyl, indenyl or fluorenyl; Ra-Rf independently represents a hydrogen or an alkyl group having 1-3 carbon atoms; X and X? respectively represent a hydrogen atom, a halogen atom, an alkoxide group, a thiolate group, an amide group, a silyl group or a hydrocarbon group having 1-20 carbon atoms; L represents a neutral Lewis base; w represents an integer of 0-3; and [B]? represents a non-coordinating anion.