MULTIFUNCTIONAL INITIATOR FOR OBTAINING STAR-SHAPED POLYMER BY ANIONIC ROUTE, CORRESPONDING STAR-SHAPED POLYMER ITS PRODUCTION, AND ITS USE

摘要

PROBLEM TO BE SOLVED: To provide a multifunctional initiator for anionic polymerization. ;SOLUTION: There is provided an initiator corresponding to the formula: (PA)_aN^n-nLi⁺ (wherein PA is a polymer block of a vinylaromatic or diene monomer A; (a) is the number of branches in block PA; N is a crosslinked core comprising no or practically no residual double bonds and has the formula: (PMc)(RLi)_p (wherein Mc is a monomer containing at least two polymerizable double bonds per molecule; PMc is a crosslinked core of at least one polymerized monomer Mc, containing 3 to 30% residual double bonds in relation to the initial double bonds originating from the monomer Mc; R is an alkyl, an aryl, an arylalkyl, an alkylaryl a cycloalkyl or an alkenyl; (p) is the number of residual double bonds in PMc which are neutralized by RLi; and (n) is the total number of anionic sites present in the crosslinked core N)).;COPYRIGHT: (C)1996,JPO