Ziegler catalyst for alpha:mono:olefin (co)polymerisation - has solid titanium component treated with acyl halide, facilitating mol. wt. control

摘要

Ziegler catalyst for the (co)polymerisation of 2-6 C alpha-monoolefins at 30-200 degrees C. and 0.1-200 bar consists of a Ti-contg. component (I) and a metal cpd. (II) of formula MAm-nXn (in which M is Al, Mg, and/or Zn. A is a 1-12C hydrocarbyl gp. X is Cl, Br, I and/or H. m is the valency of M. n is 0 to m-1), the Ti:M atomic ratio being 1:0.1-500. The novelty is that (I) is a solid phase prod. obtd. as follows. A finely-divided porous SiO2.aAl2O3 (III) (a = 0-2) with a particle dia. of 1-1000 mu m, pore vol. of 0.3-3 cm.3/g. and a surface area of 100-1000 m.2/g. is dispersed in a soln. (IV) contg. 100 (wt.) pts. alcohol Z-OH (in which Z is a satd. 1-8C hydrocarbyl gp.). 0.06-1 pts. (as Ti) of TiX'o (in which X' is Cl and/or Br) and 0.01-4 pts. (as Mg) of a Mg cpd. (V) of formula Mg6Alw(OH)xYy(B-OH)z (in which Y is Cl or Br. B is a satd. 1-8C hydrocarbyl gp. w is 0-3, x is 0-8, y = 12+3w-z and z is 0-36), which is soluble in Z-OH, to give a wt. ratio of (III):Ti in TiX'3 of 1:0.001-0.2 and of (III):Mg in (V) of 1:0.01-0.25. The dispersion is evapd. to dryness at 200 degrees C. and above the m.pt. of Z-OH. The solid intermediate obtd. is suspended in an acyl halide opt. dissolved in an organic solvent, to give a wt. ratio of Ti in the intermediate : R-CO-X of 1 : 0.01-100, giving a suspension of (I). Good mol. wt. control is attainable with less mol.wt. regulator than usual and the polymers have much better morphological properties (bulk density and flow). Polymerisation can be carried out (dis)continuously by the suspension, soln., or dry phase process.