| abstract |
(57) The present invention relates to ethylene, which can produce a propylene homopolymer consisting of Ti, Mg, halogen and an electron donating compound and having an insolubility of more than 90% in xylene at 25 ° C under normal polymerization conditions. An olefin CH 2 ＣＨCHR, wherein the olefin is CH 2 ＣＨCHR, wherein the amount of the prepolymer is up to 100 g per g of the solid catalyst component. Is hydrogen or a C1 to C12 alkyl group]. These catalyst components can obtain high catalytic activity, high isotactic index and are not affected by aging. |