Abstract: [1] A ?-phellandrene polymer which is a polymerization product of ?-phellandrene. [2] The ?-phellandrene polymer comprising ?-phellandrene units represented by chemical formulae (I-1), (I-2), (II-1) and (II-2), a total amount of the ?-phellandrene units being 50% by mass or more. [3] The ?-phellandrene polymer, which has a number average molecular weight Mn of 40,000 or more. [4] The ?-phellandrene polymer, wherein at least a part of olefinic carbon-carbon double bonds thereof are hydrogenated. [5] The ?-phellandrene polymer, which has a glass transition temperature of 80° C. or more.

Abstract: [1] A ?-phellandrene polymer which is a polymerization product of ?-phellandrene. [2] The ?-phellandrene polymer comprising ?-phellandrene units represented by chemical formulae (I-1), (I-2), (II-1) and (II-2), a total amount of the ?-phellandrene units being 50% by mass or more. [3] The ?-phellandrene polymer, which has a number average molecular weight Mn of 40,000 or more. [4] The ?-phellandrene polymer, wherein at least a part of olefinic carbon-carbon double bonds thereof are hydrogenated. [5] The ?-phellandrene polymer, which has a glass transition temperature of 80° C. or more.

Abstract: To provide a ?-pinene polymer excellent in heat resistance while having thermoplasticity, and further also having excellent strength, without impairing the inherent characteristics of small specific gravity and excellent transparency. A desired ?-pinene polymer having a weight average molecular weight of 90,000 to 1,000,000 and a glass transition temperature of 80° C. or more was obtained by polymerizing ?-pinene in the presence of a bifunctional vinyl compound.

Abstract: To provide a ?-pinene polymer excellent in heat resistance while having thermoplasticity, and further also having excellent strength, without impairing the inherent characteristics of small specific gravity and excellent transparency. A desired ?-pinene polymer having a weight average molecular weight of 90,000 to 1,000,000 and a glass transition temperature of 80° C. or more was obtained by polymerizing ?-pinene in the presence of a bifunctional vinyl compound.

Abstract: An organolithium compound represented by the following general formula (i): (i) [wherein A represents a heteroatom selected among oxygen, nitrogen, sulfur, and phosphorus; Ar represents optionally substituted aryl; R1 represents C1-10 alkyl; R2 represents C1-10 alkylene; R3 represents C1-10 alkyl or a protective group for the functional group -A-H (A is the heteroatom); and when the heteroatom A is oxygen or sulfur, then m and n each is 0 or 1, provided that the sum of m and n is 1, and when the heteroatom A is nitrogen or phosphorus, then m and n each is 0, 1, or 2, provided that the sum of m and n is 2], which has not hitherto been used in anionic polymerization, is used as an anionic polymerization initiator to easily and smoothly produce a polymer having a functional group at an end.