The activity of an in situ prepared Ziegler Natta catalyst in a solution polymerization may be tuned on a continuous basis by monitoring the catalyst activity (conversions) and on a frequent periodic basis incrementally adjusting the alkyl halide in the catalyst to optimize the activity.

The activity of an in situ prepared Ziegler Natta catalyst in a solution polymerization may be tuned on a continuous basis by monitoring the catalyst activity (conversions) and on a frequent periodic basis incrementally adjusting the alkyl halide in the catalyst to optimize the activity.

A method for producing a solid catalyst component (Aa) for ?-olefin polymerization, which includes: bringing components (A1) to (A4) into contact with one another in an inert solvent; and without washing the contact product with an inert solvent, aging the contact product by keeping for a holding time of 3 days or more and 180 days or less, regarding the time point that all of the components (A1) to (A4) first come into contact, as a starting point.

The present disclosure provides the use of quinolinyldiamido transition metal complexes, an activator and a metal hydrocarbenyl chain transfer agent, such as an aluminum vinyl-transfer agent, to produce long chain branched propylene polymers.

A solid catalyst component for the polymerization of olefins made from or containing Mg, Ti, halogen and an electron donor of formula (I) or (II): ##STR00001##
When activated with an aluminum alkyl and optionally an external electron donor, the solid catalyst component can give high activity and stereospecificity in the polymerization of olefins.

A solid catalyst component for the polymerization of olefins made from or containing Mg, Ti, halogen and an electron donor of formula (I) or (II) ##STR00001## When activated with an aluminum alkyl and optionally an external electron donor, solid catalyst component can give high activity and stereospecificity in the polymerization of olefins.

The present disclosure relates to a catalyst component for the polymerization of olefins comprising Mg. Ti and an electron donor such as mercaptoester derivatives of the general formula (I). ##STR00001##
in which Z is selected from C, Si, O, N, S or P, with the proviso that the atoms O, S, P and N are not directly linked to either the carboxylic group or the sulfur atom of formula (I), the R.sup.2 groups, equal to or different from each other, are selected from hydrogen or a C.sub.1-C.sub.20 hydrocarbon radicals, optionally containing a heteroatom selected from halogen, P, S, N, O and Si, which can be fused together to form one or more cycles, m is a number satisfying the valences of Z and n is an integer ranging from 1 to 10, X is O or S, Y is OR.sup.3, NR.sup.4R.sup.5) or R.sup.6 groups in which R.sup.1 and R.sup.3 are selected from C.sub.1-C.sub.15 hydrocarbon groups, optionally containing a heteroatom selected from halogen, P, S, N, O, and Si, R.sup.4-R.sup.5 groups, independently, are hydrogen or R.sup.1 groups, and R.sup.6 groups have the same composition as R.sup.1 groups.

Catalyst systems with single site transition metal complexes (such as quinolinyldiamide transition metal complexes), an activator, and a metal hydrocarbenyl transfer agent (preferably an aluminum vinyl-transfer agent) are disclosed for use in alkene polymerization.

A solid catalyst component for the polymerization of olefins made from or containing Mg, Ti, halogen and an electron donor of formula (I) or (II)

##STR00001##

When activated with an aluminum alkyl and optionally an external electron donor, solid catalyst component can give high activity and stereospecificity in the polymerization of olefins.

A solid catalyst component for the polymerization of olefins made from or containing Mg, Ti, halogen and an electron donor of formula (I) or (II):

##STR00001##

When activated with an aluminum alkyl and optionally an external electron donor, the solid catalyst component can give high activity and stereospecificity in the polymerization of olefins.