Copolymer, polymer composition, and crosslinked polymer
A copolymer having a structural unit derived from a conjugated diene compound and a structural unit derived from an α-olefin having 3 to 8 carbon atoms, wherein the copolymer has a melting point within a temperature range of 0 to 10° C. and has a fusion enthalpy of 5 J/g or more as measured on a differential scanning calorimeter under the following conditions. Conditions: (1) cooling from 200° C. to −150° C. at a rate of 10° C./min; (2) retaining at −150° C. for 1 minute; and (3) heating from −150° C. to 200° C. at a rate of 20° C./min.
1. A copolymer, comprising a structural unit derived from a conjugated diene compound and a structural unit derived from an α-olefin having 3 to 8 carbon atoms,
wherein the copolymer is an alternating copolymer of the structural unit derived from the conjugated diene compound and the structural unit derived from the α-olefin copolymer, and
wherein the copolymer has a melting point within a temperature range of 0 to 10° C. and has a fusion enthalpy of 5 J/g or more as measured on a differential scanning calorimeter under the following conditions:
Conditions:
(1) cooling from 200° C. to −150° C. at a rate of 10° C./min;
(2) retaining at −150° C. for 1 minute; and
(3) heating from −150° C. to 200° C. at a rate of 20° C./min.
2. A polymer composition, comprising the copolymer according to claim 1 and a crosslinking agent.
3. A crosslinked polymer obtained by crosslinking the polymer composition according to claim 2 .
4. The copolymer according to claim 1 , wherein the copolymer has a melting point within a temperature range of 0 to 8° C.
5. The copolymer according to claim 1 , wherein the copolymer has a melting point within a temperature range of 1 to 7° C.
6. The copolymer according to claim 1 , wherein the copolymer has a fusion enthalpy of 10 J/g or more.
7. The copolymer according to claim 1 , wherein the copolymer has a fusion enthalpy of 15 J/g or more.
8. The copolymer according to claim 1 , wherein the copolymer optionally comprises a structural unit derived from a monomer other than the conjugated diene compound or the α-olefin having 3 to 8 carbon atoms, an amount of the monomer being 10 weight % or less with respect to a total amount of monomers used in a polymerization of the copolymer.
9. The copolymer according to claim 1 , wherein the copolymer optionally comprises a structural unit derived from a monomer other than the conjugated diene compound or the α-olefin having 3 to 8 carbon atoms, an amount of the monomer being 5 weight % or less with respect to a total amount of monomers used in a polymerization of the copolymer.
10. The copolymer according to claim 1 , wherein the copolymer optionally comprises a structural unit derived from a monomer other than the conjugated diene compound or the α-olefin having 3 to 8 carbon atoms, an amount of the monomer being 1 weight % or less with respect to a total amount of monomers used in a polymerization of the copolymer.