Method for manufacturing copolymer
An object of the present disclosure is to provide a method for manufacturing a copolymer, wherein a crystal content and a vinyl bond content (or a glass transition temperature) of the copolymer can be controlled. Specifically, the present disclosure provides a method for manufacturing a copolymer, wherein the method comprises a process of copolymerizing ethylene with isoprene under the presence of a polymerization catalyst composition containing a half metallocene cation complex represented by following general formula (I) (In formula (I), M represents a lanthanoid element, scandium or yttrium; Cp R′ represents substituted cyclopentadienyl, substituted indenyl or substituted fluorenyl; X represents hydrogen atom, halogen atom, alkoxy, thiolate, amide, silyl, or a C 1-20 monovalent hydrocarbon group; L represents a neutral Lewis base; w represents an integer in the range of 0 to 3; and [B] − represents a non-coordinating anion), wherein Cp R′ in general formula (I) has at least two substituent groups.
1. A method for manufacturing a copolymer, wherein the method comprises:
a process of copolymerizing ethylene with isoprene under the presence of a polymerization catalyst composition containing a half metallocene cation complex represented by following general formula (I)
(In formula (I), M represents a lanthanoid element, scandium or yttrium; Cp R′ represents substituted cyclopentadienyl, substituted indenyl or substituted fluorenyl; X represents hydrogen atom, halogen atom, alkoxy, thiolate, amide, silyl, or a C 1-20 monovalent hydrocarbon group; L represents a neutral Lewis base; w represents an integer in the range of 0 to 3; [B] − represents a non-coordinating anion), and
Cp R′ in general formula (I) has at least two substituent groups; and
a process of controllably setting a crystal content, a vinyl bond content or the glass transition temperature, of a copolymer to be manufactured, at desired values by selecting type of at least one of the core metal M and the ligand Cp R′ ,
wherein the vinyl bond content is the sum of a content of 1,2-bonding unit and a content of 3,4-bonding unit of isoprene, and
the copolymer thus manufactured has the vinyl bond content in the range of 20 mass % to 50 mass % and the crystal content in the range of 10% to 50%.
2. The method for manufacturing a copolymer of claim 1 , wherein each of the at least two substituent groups of Cp R′ independently represents tert-butyl, phenyl, benzyl, or metalloid group.
3. The method for manufacturing a copolymer of claim 1 , wherein Cp R′ in general formula (I) is a substituted indenyl and at least one substituent group of the substituted indenyl contains Si.
4. The method for manufacturing a copolymer of claim 3 , wherein at least one substituent group of the substituted indenyl exists on the five-membered ring of the substituted indenyl.
5. The method for manufacturing a copolymer of claim 1 , wherein the polymerization catalyst composition contains no halogen compound.
6. The method for manufacturing a copolymer of claim 2 , wherein the polymerization catalyst composition contains no halogen compound.
7. The method for manufacturing a copolymer of claim 3 , wherein the polymerization catalyst composition contains no halogen compound.
8. The method for manufacturing a copolymer of claim 4 , wherein the polymerization catalyst composition contains no halogen compound.
9. The method for manufacturing a copolymer of claim 1 , wherein the copolymer thus manufactured has the crystal content in the range of 14% to 30%.