Method for Producing Copolymer Having Improved Oil Retainability

3:

• The method for producing according to claim 2,
• wherein the cooling comprises maintaining a temperature change during the polymerizing to be less than 15° C.

4:

• The method for producing according to claim 1,
• wherein a starting temperature of the polymerizing is from 10 to 90° C.

5:

• The method for producing according to claim 1,
• wherein the monomers include butadiene.

6:

• The method for producing according to claim 1,
• wherein the monomers include isoprene.

7:

• The method for producing according to claim 1,
• wherein the monomers include 7,11-dimethyl-3-methylene-1,6,10-dodecatriene (β-farnesene).

8-10. (canceled)

11:

• The method for producing according to claim 1, further comprising hydrogenating the copolymer, thereby producing a α-olefin random copolymer.

(canceled)

13:

• The method for producing according to claim 1,
• wherein the copolymer has a weight-average molecular weight from 10,000 to 500,000 Da.

14:

• The method according to claim 1,
• wherein the copolymer contains a content of 5 to 85 mol % of the vinyl bond structural unit of monomer units to a total molar amount of conjugated diene (1,3-diene structure) monomer units incorporated in the bonding mode of 3,4-, 1,4-, and 1,2-bonds of a conjugated diene monomer.

(canceled)

18:

• The method for producing according to claim 15,
• wherein the first and second aromatic vinyl compounds each independently comprise a compound selected from the group consisting of styrene, α-methylstyrene, 4-methylstyrene, o-methylstyrene, m-methylstyrene, β-methylstyrene, 2,6-dimethylstyrene, 2,4-dimethylstyrene, α-methyl-o-methylstyrene, α-methyl-m-methylstyrene, α-methyl-p-methylstyrene, β-methyl-o-methylstyrene, β-methyl-m-methylstyrene, β-methyl-p-methylstyrene, 2,4,6-trimethylstyrene, α-methyl-2,6-dimethylstyrene, α-methyl-2,4-dimethylstyrene, 3-methyl-2,6-dimethylstyrene, f-methyl-2,4-dimethylstyrene, o-chlorostyrene, m-chlorostyrene, p-chlorostyrene, 2,6-dichlorostyrene, 2,4-dichlorostyrene, α-chloro-o-chlorostyrene, α-chloro-m-chlorostyrene, α-chloro-p-chlorostyrene, β-chloro-o-chlorostyrene, β-chloro-m-chlorostyrene, β-chloro-p-chlorostyrene, 2,4,6-trichlorostyrene, α-chloro-2,6-dichlorostyrene, α-chloro-2,4-dichlorostyrene, β-chloro-2,6-dichlorostyrene, β-chloro-2,4-dichlorostyrene, o-t-butylstyrene, m-t-butylstyrene, p-butylstyrene, o-methoxystyrene, m-methoxystyrene, p-methoxystyrene, o-chloromethylstyrene, m-chloromethylstyrene, p-chloromethylstyrene, o-bromomethylstyrene, m-bromomethylstyrene, p-bromomethylstyrene, silyl group-substituted styrene derivatives, indene, and vinylnaphthalene.

19-21. (canceled)

22:

• The method for producing according to claim 17,
• wherein the tri-block copolymer is a hydrogenated tri-block copolymer, and
• wherein a crystallization peak temperature (Tc) measured by DSC at 10° C./min of the hydrogenated tri-block copolymer is −8° C. to 4° C.

(canceled)

25-31. (canceled)

32:

• The method for producing according to claim 1,
• wherein the solvent comprises at least one selected from the group consisting of saturated aliphatic hydrocarbons, saturated alicyclic hydrocarbons, and aromatic hydrocarbons.

33-38. (canceled)

39:

• The method for producing according to claim 1, further comprising adding a polymerization terminator to the solvent.

(canceled)

41:

• The method for producing according to claim 17, further comprising precipitating the tri-block copolymer in another solvent.

42:

• The method for producing according to claim 1, further comprising:
• washing the polymerization reaction liquid with water, separating, and drying.

43:

• A tri-block copolymer produced by the method of claim 17.