Method for production of conjugated diene rubber
AssigneeZeon Corporation
InventorsEijun Ueda, Takashi Iizuka
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Abstract
A method of production of conjugated diene rubber including a first step of polymerizing a compound represented by a following formula (1) by using a polymerization initiator to obtain a polymer block of the compound represented by the formula (1) having an active end, and a second step of polymerizing a monomer containing at least a conjugated diene compound by using the active end of the polymer block, wherein, in the formula (1), R1 is a hydrogen atom or a hydrocarbon group having 1 to 20 carbon atoms, R2 is a hydrocarbon group having 3 to 20 carbon atoms and containing a ring structure, each of R3 and R4 independently is a hydrogen atom or a hydrocarbon group having 1 to 20 carbon atoms which is substituted or unsubstituted, and X is arbitrary monovalent group.
Claims10
A method of production of a conjugated diene rubber comprising:
- a first step comprising polymerizing a compound represented by a following formula (1) by using a polymerization initiator to obtain a polymer block of the compound represented by the formula (1) having an active end, and
- a second step comprising polymerizing at least a monomer containing a conjugated diene compound by using the active end of the polymer block,
- wherein:
- the weight average molecular weight (Mw) of the polymer block is 400 to 60,000;
- the weight average molecular weight (Mw) of the conjugated diene rubber obtained at the second step is 100,000 to 1,000,000;
- and
- in the formula (1), R1 is a hydrogen atom or a hydrocarbon group having 1 to 20 carbon atoms, R2 is a hydrocarbon group having 3 to 20 carbon atoms and containing a ring structure, each of R3 and R4 independently is a hydrogen atom or a hydrocarbon group having 1 to 20 carbon atoms which is substituted or unsubstituted, and X is arbitrary monovalent group.
The method of production of a conjugated diene rubber according to claim h wherein the compound represented by the formula (1) is a compound represented by a following formula (1′):
- wherein, in the formula (1′), R1 to R4 are the same as those in formula (1), R5 is a hydrocarbon group having 3 to 20 carbon atoms and containing a ring structure, and each of R6 and R7 independently is a hydrogen atom or a hydrocarbon group having 1 to 20 carbon atoms which is substituted or unsubstituted.
The method of production of a conjugated diene rubber according to claim h further comprising:
- a third step of reacting an active end of a polymer chain obtained in the second step with a silane compound having a functional group able to react at the active end.
Dependencies are inferred from the claim text.