Method for cleaving coordinate bond of complex polymer
AssigneeBridgestone Corporation
InventorTomoyuki Kosai
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Abstract
A method for cleaving a coordinate bond of a complex polymer that contains at least one polymer chain and a plurality of nitrogen- and/or phosphorus-containing functional groups which are bonded to the polymer chain and capable of forming coordinate bonds, wherein the coordinately-bondable nitrogen- and/or phosphorus-containing functional groups form a coordinate bond via a metal ion, characterized in that the method includes dissolving the complex polymer in a solvent containing a free ligand, to cleave the coordinate bond.
Claims20
A method for cleaving a coordinate bond of a complex polymer that contains at least two polymer chains and a plurality of nitrogen- and/or phosphorus-containing functional groups which are bonded to the polymer chains and capable of forming coordinate bonds, the complex polymer containing a conjugated diene unit and/or an olefin unit, wherein the coordinately-bondable nitrogen- and/or phosphorus-containing functional groups form coordinate bonds via a metal ion intramolecularly and intermolecularly, thereby forming a crosslink between the polymer chains, so that the complex polymer constitutes a rubber, characterized in that the method comprises:
- dissolving the complex polymer in a solvent containing a free ligand, to cleave the coordinate bond of the complex polymer by a ligand exchange reaction between the free ligand and the complex polymer, thereby either completely or partially dissociating the metal ion from the plurality of nitrogen- and/or phosphorus-containing functional groups and breaking down the crosslink between the polymer chains of the rubber, and
- wherein the method involves no hydrolysis.
Dependencies are inferred from the claim text.