Diene / monovinylarene copolymers and methods of production and continuous polymerization method for preparing oil-extended rubber and conjugated

The present invention relates to a method for producing 1,3-conjugated diene / monovinylarene copolymers and continuous polymerization, which comprises a monomer containing a, an organic solvent, 1,2-butadiene, alkyl-tetrahydro- the reaction mass furfuryl alcohol ether, and an organic lithium continuously fed reactor, at a reaction temperature of 130-150 deg.] C, a reaction pressure of 0.5-0.9MPa polymerizing a monomer 30-270 minutes to obtain a copolymer, the monomers a monovinyl aromatic hydrocarbons and conjugated diene, monomer a has a weight basis, the amount of 1,2-butadiene is 75-225ppm. Copolymers obtained by the present invention, can be both a high vinyl content, Mooney viscosity and molecular weight distribution, gel content and reasonably. The present invention also relates to oil-extended rubber and a preparation method. The present invention provides an oil-extended rubber is suitable for subsequent processing.