PROCESS FOR THE PREPARATION OF CATALYSTS

摘要

1434543 Supported organometallic polymerization catalysts MONTECATINI EDISON SpA 11 Sept 1973 [13 Sept 1972] 42758/73 Heading C3P A catalyst for the polymerization of olefins comprises a reaction product of: (a) an organometallic compound of a metal of Groups II or III of the Mendeleef Periodic System, with: (b) a magnesium dihalide carrier having a halogen-containing titanium compound chemically combined therewith or dispersed thereon, the carrier combination being in the form of spheroidal particles which are 1-350 microns in diameter, which have a mechanical resistance to supersonic vibration (defined) a mean pore radius (defined) and a surface area which satisfy one of the following relationships: (1) mechanical resistance=5-40 Watt h./l., mean pore radius=30-70 angstroms, and surface area=3-70 sq. m./gm.; or (2) mechanical resistances=1-20 Watt h./l., mean pore radius=70-150 angstroms, and surface area is greater than 70 sq. m./gm. Component (b) may be prepared by spraying hydrated magnesium chloride MgCl 2 .6H 2 O, in aqueous solution, or molten, to obtain the desired particle size, partially dehydrating, and then treating with the halo-titanium compound. Suitable titanium compounds are TiCl 4 , TiCl 2 (0C 3 H 9 ) 2 and TiBr 4 . Suitable organometallic compounds are aluminium trialkyls, aluminium dialkyl halides, and zinc and magnesium alkyls. Olefins which may be polymerized (usually in solution) are ethylene, propylene, butene-1 and 4-methyl-pentene-1. "Mean pore radius" is the ratio 2V/S.104 where V is the total porosity of the particles in cc./gm. and S is the surface area in sq. m./gm. "Mechanical resistance to supersonic vibration" is the minimum specific energy (Watt h.l.) that needs to be supplied to the particles suspended in heptane at a concentration of 2-3%, to disintegrate them.