申请人:Bridgestone Corporation
                            
                            
                                公开号:US20140187725A1
                            
                            
                                公开(公告)日:2014-07-03
                            
                            A method for preparing a coupled polymer, the method comprising the steps of: (i) polymerizing monomer to form a reactive polymer, and (ii) reacting the reactive polymer with coumarin or a substituted coumarin compound.