Abstract:
A process for preparing a catalyst component comprising Mg, Ti, and at least an electron donor compound (ID) said process comprising two or more steps of reaction in which in a first step (a) carried out at a temperature ranging from 0 to 150°C, a Mg based compound is reacted with a Ti compound, having at least a Ti-Cl bond, in an amount such that the Ti/Mg molar ratio is greater than 3 so as to generate an intermediate solid catalyst component containing Mg and Ti and, in a following step (b), the intermediate solid catalyst component (a) is contacted, in a gaseous dispersing medium, with a gaseous stream containing the electron donor compound (ID) thereby obtaining a final solid catalyst component having an ID/Ti molar ratio ranging from 0.5:1 to 20:1.
Abstract:
Feeding a supported antistatic compound that does not comprise a transition- metal-based catalyst component to an olefin polymerization reactor allows avoiding the formation of polymer agglomerates in the reactor while at the same time minimizing negative effects on catalyst yield.
Abstract:
A solid catalyst component for the polymerization of olefins comprising Mg, Ti, halogen, and an electron donor compound selected from glutarates said catalyst being characterized by specific porosity features and being able to produce olefin polymers endowed with low bulk density and relatively high porosity.
Abstract:
A solid catalyst component comprising Ti, Mg, chlorine and an internal donor selected from esters of aliphatic monocarboxylic acids (EAA) and another internal donor selected from cyclic ethers (CE) such as the EAA/CE molar ratio ranges from 0.2 to less than 20. The so obtained catalyst component when converted into a catalyst is able to produce ethylene polymers with good morphological properties even under drastic polymerization conditions.
Abstract:
Feeding a supported antistatic compound that does not comprise a transition-metal-based catalyst component to an olefin polymerization reactor allows avoiding the formation of polymer agglomerates in the reactor while at the same time minimizing negative effects on catalyst yield.
Abstract:
Feeding a supported antistatic compound that does not comprise a transition-metal-based catalyst component to an olefin polymerization reactor allows avoiding the formation of polymer agglomerates in the reactor while at the same time minimizing negative effects on catalyst yield.