Multicomponent copolymer, rubber composition, and tire
Provided is a polymer that contributes to the improvement of the durability and weather resistance of rubber compositions or rubber products such as a tire, and has low crystallinity. Disclosed is a multicomponent copolymer comprising a conjugated diene unit, a non-conjugated olefin unit, and an aromatic vinyl unit, wherein the multicomponent copolymer has a main chain consisting only of an acyclic structure, and the content of cis-1,4 bonds in the entire conjugated diene unit is 50% or more.
1. A multicomponent copolymer comprising a conjugated diene unit, a non-conjugated olefin unit, and an aromatic vinyl unit, wherein the multicomponent copolymer has a main chain consisting only of an acyclic structure, the content of cis-1,4 bonds in the entire conjugated diene unit is 50% or more, the content of the conjugated diene unit is 1 to 99 mol %, the total content of the non-conjugated olefin unit and the aromatic vinyl unit is 1 to 99 mol %, and a mole ratio represented by the non-conjugated olefin unit:the aromatic vinyl unit is 13.2:86.8 to 98.3:1.7.
2. The multicomponent copolymer according to claim 1 , wherein the non-conjugated olefin unit is an acyclic non-conjugated olefin unit.
3. The multicomponent copolymer according to claim 2 , wherein the acyclic non-conjugated olefin unit consists only of an ethylene unit.
4. The multicomponent copolymer according to claim 1 , wherein the highest melting point (T m ) is 100° C. or lower, or the melting point (T m ) has disappeared.
5. The multicomponent copolymer according to claim 1 , wherein the aromatic vinyl unit comprises a styrene unit.
6. The multicomponent copolymer according to claim 1 , wherein the conjugated diene unit comprises a 1,3-butadiene unit and/or an isoprene unit.
7. The multicomponent copolymer according to claim 1 , wherein the conjugated diene unit consists only of a 1,3-butadiene unit.
8. The multicomponent copolymer according to claim 1 , which is a terpolymer consisting only of a 1,3-butadiene unit, an ethylene unit, and a styrene unit.
9. A rubber composition comprising the multicomponent copolymer according to claim 1 .
10. A tire, wherein the rubber composition according to claim 9 is used.
11. A multicomponent copolymer comprising a conjugated diene unit, a non-conjugated olefin unit, and an aromatic vinyl unit, wherein the multicomponent copolymer has a main chain consisting only of an acyclic structure, the content of cis-1,4 bonds in the entire conjugated diene unit is 50% or more, the content of the conjugated diene unit is 1 to 52.1 mol % and the total content of the non-conjugated olefin unit and the aromatic vinyl unit is 47.9 to 99 mol %.
12. The multicomponent copolymer according to claim 11 , wherein the non-conjugated olefin unit is an acyclic non-conjugated olefin unit.
13. The multicomponent copolymer according to claim 12 , wherein the acyclic non-conjugated olefin unit consists only of an ethylene unit.
14. The multicomponent copolymer according to claim 11 , wherein the highest melting point (T m ) is 100° C. or lower, or the melting point (T m ) has disappeared.
15. The multicomponent copolymer according to claim 11 , wherein the aromatic vinyl unit comprises a styrene unit.
16. The multicomponent copolymer according to claim 11 , wherein the conjugated diene unit comprises a 1,3-butadiene unit and/or an isoprene unit.
17. The multicomponent copolymer according to claim 11 , which is a terpolymer consisting only of a 1,3-butadiene unit, an ethylene unit, and a styrene unit.
18. A rubber composition comprising the multicomponent copolymer according to claim 11 .
19. A tire, wherein the rubber composition according to claim 18 is used.