Abstract: The present invention relates to a Ziegler-Natta catalyst comprising a solid, ligand-modified catalyst component formed at least from (a) a compound of Group 1 to 3 of the Periodic Table (IUPAC), (b) a transition metal compound of Group 4 to 10 of the Periodic Table (IUPAC), or a compound of an actinide or lanthanide, (c) one or more organic ligand compound(s) which is/are selected from organic compounds comprising a cyclopentadienyl anion backbone, and (d) a compound of Group 13 of the Periodic Table, wherein the catalyst component of said Ziegler-Natta catalyst is formed in an emulsion/solidification method, to a process for the production of such a catalyst, and to a process for the production of an olefin (co-)polymer in the presence of such a catalyst.

Abstract: Polymers of propylene with one or two olefin comonomers are produced through the use of a polymerization catalyst supported on a carrier produced by spray crystallization and having a maximum dimension of 55 ?m. Copolymers of superior properties are obtained, and the production process is de-snagged.

Abstract: Polymers of propylene with one or two olefin comonomers are produced through the use of a poymerisation catalyst supported on a carrier produced by spray crystallisation and having a maximum dimension of ?m. Copolymers of superior properties are obtained, and the production process is de-snagged.

Abstract: The invention relates to a process for the preparation of a high activity procatalyst for the production of ethylene polymers. The process according to the present invention comprises the following steps:(a) contacting the inorganic support with an alkyl metal chloride which is soluble in non-polar hydrocarbon solvents, and has the formula(R.sub.n MeCl.sub.3-n).sub.m (1)wherein R is a C.sub.1 -C.sub.20 aklyl group, Me is a metal of group III(13) of the periodic table, n=1 or 2 and m=1 or 2, to give a first reaction product,(b) contacting said first reaction product with a compound or mixture containing hydrocarbyl and hydrocarbyl oxide linked to magnesium which is soluble in non-polar hydrocarbon solvents, to give a second reaction product, and(c) contacting said second reaction product with a titanium compound which contains chlorine, having the formulaCl.sub.x Ti(OR.sup.IV).sub.4-x (2)wherein R.sup.IV is a C.sub.2 -C.sub.20 hydrocarbyl group and x is 3 or 4, to give said procatalyst.

Abstract: The invention relates to a procatalyst for the production of ethylene polymers, which procatalyst comprises an inorganic support, a chlorine compound carried on said support, a magnesium compound carried on said support, a titanium compound carried on said support, whereby the chlorine compound can be different from or the same as the magnesium compound and/or the titanium compound. The activity balance AB of the procatalyst in specified polymerization conditions, isAB>3.2wherein AB=?(A+A'):2!.multidot.?log (MFR.sub.2 ':MFR.sub.2):(A-A')!, A means polymerization activity expressed an kg PE/g cat .multidot.h, MFR.sub.2 means the melt flow rate in g/min units at a load of 2,16 kg, according to the standard ISO 1133, the absence of the upper index ' means low melt flow rate polymerization and the presence of the upper index ' means high melt flow polymerization. This means that the catalyst activity is relatively independent of the presence of chain transfer agents.