| 摘要 |
A process for addition polymerisation of vinylic (in particuar methacrylic) monomers at a temperature in the range of -20 to 60 DEG C, in the presence of a catalyst comprising: (a) a first component of empirical formula (I): <CHEM> wherein M is an alkali metal atom; and T is bulky hydrocarbyl which contains at least 4 carbon atoms and is optionally substituted by one or more pendent substituents, or hetero-substituted hydrocarbyl, each of which is inert in the process conditions; and (b) a (co-catalyst) second component comprising a compound of empirical formula (II): <CHEM> wherein Q is Al, B or Zn; m, n and p are each 0 or an integer such that (m + n + p) = 2 or 3 (depending on the appropriate valency of Q; and X, Y and Z are each independently optionally substituted bulky hydrocarbyl, or X and Y together are optionally substituted hydrocarbadiyl, and Z is optionally substituted bulky hydrocarbyl, all of which groups are inert in the process conditions. a |
