摘要:
The present disclosure relates to a process for preparing a MgCl2-alcohol adduct which comprises (a) forming a mixture of an MgCl2-alcohol adduct in molten form and a liquid which is immiscible with the adduct, (b) subjecting the mixture to a shear stress to obtain an emulsion, and (c) rapidly cooling the emulsion to solidify the disperse phase and collecting the solid adduct particles, the process being characterized by the fact that step (b) is carried out in a device comprising a first outer and second inner cylindrical members that define an annulus between them, wherein at least one of the cylindrical members rotate with respect to the other.
摘要:
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.
摘要:
b) an oligomeric or polymeric organic compound having one or more terminal hydroxyl groups and a viscosity at 40° C. of at least about 20 mm2/sec (DIN 51562).
摘要:
Catalyst component for the polymerization of olefins comprising Mg, Ti, halogen and an electron donor is obtained by a batch process comprising: (A) A first step comprising reacting an adduct of formula MgCl2(ROH)n, where R is a C1-C10 alkyl group, and n is from 0.5 to 6, in a liquid medium comprising a titanium compound having at least a Ti-Cl bond at a temperature ranging from 0°C to 80°C and then removing the liquid medium; (B) A subsequent step comprising reacting the solid product obtained in (A) in a liquid medium comprising an electron donor ED selected from ethers, esters, ketones, silanes, amines, nitriles and amides, and a titanium compound having at least a Ti-Cl bond at a temperature higher than 80°C and then, after removing the liquid medium; (C) A subsequent step comprising reacting the solid product coming from (B) with a liquid medium comprising a titanium compound having at least a Ti-Cl bond at a temperature higher than 80°C.
摘要:
A gas-phase process for the homopolymerization or copolymerization of propylene with other olefins, including carrying out the polymerization in the presence of a catalyst system made from or containing: (a) a solid catalyst component made from or containing Mg, Ti, halogen, an electron donor selected from 1.3-diethers and an olefin polymer in a specific amount; (b) an aluminum alkyl compound and (c) an external electron donor (ED) compound, wherein components (b) and (c) being employed in amounts such that the Al/(ED) molar ratio ranges from about 2 to about 200.
摘要:
The present disclosure provides a catalyst system made from or containing: (A) a solid catalyst component made from or containing (i) a titanium compound supported on a magnesium dichloride; (B) an aluminum alkyl compound; and (C) a halogenated organic ester of formula A-COOR, wherein R is a C1-C10 hydrocarbon group and A is a C1-C15 saturated or unsaturated hydrocarbon group in which at least one of the hydrogen atoms is replaced by a chlorine atom. The present disclosure also provides a process for preparing an olefinic polymer, including a polymerization step of polymerizing an olefin in the presence of the catalyst system. The present disclosure also provides an olefinic polymer made therefrom.
摘要:
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.