Conjugated diene polymer and method for producing conjugated diene polymer
AssigneeSumitomo Chemical Company, Limited
InventorHiroshi Aoshima
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Abstract
The method for producing a conjugated diene-based polymer of the invention comprises step 1 in which a polymerization initiator is added to a monomer including a conjugated diene compound in a hydrocarbon solvent to obtain a polymerization solution, and step 2 in which a polymerization initiator is further added to the polymerization solution either once or two or more times to obtain a polymer with an active end, wherein in step 1 and/or step 2, a modifying agent is added which has a functional group that is copolymerizable with the conjugated diene compound.
Claims7
A method for producing a conjugated diene-based polymer comprising:
- step 1 in which a polymerization initiator is added to a monomer including a conjugated diene compound in a hydrocarbon solvent to obtain a polymerization solution, and
- step 2 in which a polymerization initiator and the monomer including a conjugated diene compound are further added to the polymerization solution either once or two or more times and polymerization reaction is further conducted to obtain a polymer with an active end,
- wherein in step 1 and/or step 2, a modifying agent is added which has a functional group that is copolymerizable with the conjugated diene compound.
A method for producing a conjugated diene-based polymer comprising:
- step 1 in which a polymerization initiator is added to a monomer including a conjugated diene compound in a hydrocarbon solvent to obtain a polymerization solution,
- step 2 in which a polymerization initiator and the monomer including a conjugated diene compound are further added to the polymerization solution either once or two or more times and polymerization reaction is further conducted to obtain a polymer with an active end, and
- step 3 in which the polymer with the active end is reacted with a modifying agent having a functional group that is reactive with the active end, to introduce the modifying agent-based unit at the end of the polymer.
A conjugated diene-based polymer having at least a peak with a peak top molecular weight greater than 800,000, a peak with a peak top molecular weight in the range of 100,000 to 800,000 and a peak with a peak top molecular weight less than 100,000, as measured by gel permeation chromatography, and having a monomer unit derived from at least one type of modifying agent selected from the group consisting of compounds with the structure represented by the following formula (6), compounds with the structure represented by the following formula (7) and compounds with the structure represented by the following formula (8),
- [In formula (6), X1, X2 and X3 each independently represent a hydrocarbyl group, a hydrocarbyloxy group, a halogen atom or a functional group capable of reacting with the active end of the conjugated diene-based polymer, R61 and R62 each independently represent a hydrogen atom or a hydrocarbyl group, and when multiple R61 and R62 groups are present they may be the same or different, A1 represents an organic group having at least one atom selected from the group consisting of oxygen atoms, nitrogen atoms, phosphorus atoms, sulfur atoms and silicon atoms, optionally having a ring structure, with a portion of the structure of X1, X2 or X3 optionally bonded to a portion of A1, and “a” represents an integer of 0 to 10],
- [In formula (7), R71 represents a hydrogen atom or a hydrocarbyl group, s represents 0 or 1 (an integer of 0 or 1), R72 represents a hydrocarbylene group, and A2 represents a substituted amino group, a nitrogen-containing heterocyclic group or a substituted silyl group],
- [In formula (8), R81 and R82 each independently represent an optionally substituted hydrocarbyl group, or they represent a hydrocarbylene group wherein a portion of R81 and a portion of R82 are bonded, optionally having a nitrogen atom and/or an oxygen atom, or R84 represents an optionally substituted hydrocarbyl group or a hydrogen atom, or a portion of either R81 or R82 and a portion of R84 are bonded together to form a hydrocarbylene group, which optionally has a nitrogen atom and/or an oxygen atom, R83 represents a divalent group, and n is 0 or 1.
Dependencies are inferred from the claim text.