The present invention relates to a method for preparing a liquid rubber, and relates to a method for preparing a liquid rubber, including performing polymerization reaction of a conjugated diene-based monomer in the presence of an organic solvent and a catalyst composition (S10), wherein the catalyst composition includes a catalyst including a compound represented by the following Formula 1, and a liquid rubber prepared therefrom:

##STR00001## wherein R, R.sub.1 to R.sub.4, and o, p, q and r are described herein.

The present invention relates to a method for preparing a liquid rubber, and relates to a method for preparing a liquid rubber, including performing polymerization reaction of a conjugated diene-based monomer in the presence of an organic solvent and a catalyst composition (S10), wherein the catalyst composition includes a catalyst including a compound represented by the following Formula 1, and a liquid rubber prepared therefrom:

##STR00001## wherein R, R.sub.1 to R.sub.4, and o, p, q and r are described herein.

The present invention provides a conjugated diene polymer containing a low vinyl portion having a vinyl content of 2 to 20% by mol and a high vinyl portion having a vinyl content of 50% by mol or more, and a method for producing the same; a rubber composition containing a rubber component containing the conjugated diene polymer, at least one filler selected from the group consisting of carbon black and silica, a silane coupling agent, and a crosslinking agent; crosslinked rubber prepared by crosslinking the rubber composition; and a rubber product and a tire containing the crosslinked rubber. The tire can achieve both the abrasion resistance and the low fuel consumption capability, the conjugated diene polymer, the rubber composition, and the crosslinked rubber are preferred for producing the tire, and the rubber product is excellent in abrasion resistance and low heat generation property.

The present disclosure provides ethanol comprising an inorganic component and/or an organic component. The inorganic component may contain at least one component selected from the group consisting of: silicon having a content of 10 mg/L or more and 100 mg/L or less; chromium having a content of 0.6 mg/L or less; iron having a content of 2.0 mg/L or less; sodium having a content of 150 mg/L or more and 1000 mg/L or less; and potassium having a content of 1.0 mg/L or more and 10 mg/L or less. The organic component may contain at least one component selected from the group consisting of: aliphatic hydrocarbon having a content of 0.16 mg/L or more and 10 mg/L or less; aromatic hydrocarbon having a content of 0.4 mg/L or more and 10 mg/L or less; and dialkyl ether having a content of 0.1 mg/L or more and 100 mg/L or less.

A method of preparing a conjugated diene-based polymer is provided including: a step of polymerizing a first conjugated diene-based monomer in solution in a first polymerization reactor to prepare a first polymer solution including a first conjugated diene-based polymer; a step of polymerizing a second conjugated diene-based monomer in solution in a second polymerization reactor to prepare a second polymer solution including a second conjugated diene-based polymer; a step of supplying a first fluid separated from the first polymer solution to a first purification unit and purifying the first fluid; and a step of supplying a second fluid separated from the second polymer solution to a second purification unit and purifying the second fluid. An apparatus for preparing a conjugated diene-based polymer is also provided.

A method of preparing a conjugated diene-based polymer is provided including: a step of polymerizing a first conjugated diene-based monomer in solution in a first polymerization reactor to prepare a first polymer solution including a first conjugated diene-based polymer; a step of polymerizing a second conjugated diene-based monomer in solution in a second polymerization reactor to prepare a second polymer solution including a second conjugated diene-based polymer; a step of supplying a first fluid separated from the first polymer solution to a first purification unit and purifying the first fluid; and a step of supplying a second fluid separated from the second polymer solution to a second purification unit and purifying the second fluid. An apparatus for preparing a conjugated diene-based polymer is also provided.

The present invention is directed to a functionalized elastomer comprising the reaction product of a living anionic elastomeric polymer and a polymerization terminator of formula (1)

##STR00001##

where the substituent structures are further defined.

A method for producing a dispersion of metal-containing particles includes contacting a metal-supported material obtained by supporting a metal and/or a metal compound on a carrier with a polymeric protective agent showing affinity for the metal and/or the metal compound in a solvent to obtain a dispersion of metal-containing particles in which the metal and/or the metal compound is dispersed in the solvent in the form of particles.

A method for producing a dispersion of metal-containing particles includes contacting a metal-supported material obtained by supporting a metal and/or a metal compound on a carrier with a polymeric protective agent showing affinity for the metal and/or the metal compound in a solvent to obtain a dispersion of metal-containing particles in which the metal and/or the metal compound is dispersed in the solvent in the form of particles.

The present invention relates to a process for preparing a diene elastomer/polylactide copolymer, the weight percentage of polylactide being between 10% and 45% by weight, relative to the weight of the copolymer, characterized in that lactide, an elastomer functionalized by at least one group bearing at least one function capable of initiating a ring-opening polymerization of the lactide and a catalytic system are introduced into an extruder (A).