A process for addition polymerisation of vinylic (in particuar methacrylic) monomers at a temperature in the range of -20 to 60°C, in the presence of a catalyst comprising:
(a) a first component of empirical formula (I):
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):
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.
在催化剂存在下,
乙烯基(特别是
甲基丙烯酸)单体在-20-60℃温度范围内进行加成聚合的工艺,包括
(a) 经验式 (I) 的第一组分:
其中
M 是碱
金属原子;和
T 是含有至少 4 个碳原子且任选被一个或多个下垂取代基取代的笨重烃基,或杂取代烃基,其中每个取代基在工艺条件下都是惰性的;以及
(b) 由经验式(II)化合物组成的(助催化剂)第二组分:
其中
Q 是 Al、B 或 Zn
m、n 和 p 各为 0 或整数,使得 (m + n + p) = 2 或 3(取决于 Q 的适当价数;以及
X、Y 和 Z 各自独立地是任选取代的笨重烃基,或
X 和 Y 共同为任选取代的烃基,Z 为任选取代的笨重烃基、
所有这些基团在加工条件下均为惰性。