摘要:
Catalyst component having average particle size equal to or lower than 40 μm comprising a magnesium halide, a titanium compound having at least a Ti-halogen bond and at least two electron donor compounds one of which being present in an amount from 15 to 50% by mol with respect to the total amount of donors and selected from succinates of formula (I) below in which the radicals R1 and R2, equal to, or different from, each other are a C1-C20 linear or branched alkyl, alkenyl, cycloalkyl, aryl, arylalkyl or alkylaryl group, optionally containing heteroatoms; and the radicals R3 and R4 equal to, or different from, each other, are C1-C20 alkyl, C3-C20 cycloalkyl, C5-C20 aryl, arylalkyl or alkylaryl group with the proviso that at least one of them is a branched alkyl; said compounds being, with respect to the two asymmetric carbon atoms identified in the structure of formula (I), stereoisomers of the type (S,R) or (R,S) and at least another electron donor compound which is extractable, under the test of extractability disclosed in the characterization section, for more than 30% by mol
摘要:
Process for the preparation of a solid catalyst component for the polymerization of olefins, the process comprising the steps of: —continuously contacting solid particles of a MgCl2.mROH adduct, wherein 0.5
摘要:
A method for continuously recovering titanium tetrachloride TiCl4 from a waste liquid comprising TiCl4 and by-products, wherein said waste liquid is subjected, as a flowing liquid film, to an evaporation step for a residence time of less than 15 minutes at a temperature higher than 90° C.
摘要:
A multistage process for the continuous production of an emulsion comprising subjecting at least two immiscible liquids to a sequence of at least two mixing stages carried out in at least two successive stator-rotor devices, wherein a peripheral outlet from a first stator-rotor device is connected to an axial inlet in the successive stator-rotor device by means of a duct in which the Reynold number ReT inside said duct is higher than 5000, and the peripheral velocity of each rotor of said stator-rotor devices ranges from 5 to 60 m/s.
摘要:
Disclosed are a crystalline propylene copolymer composition, film, sheet and plate made therefrom and laminates wherein at least one layer is made therefrom, having low seal initiation temperature and good ink adhesion properties. The composition comprises (percent by weight):A) 20-60% of a crystalline copolymer of propylene with 1 to 5% ethylene; andB) 40-80% of a crystalline copolymer of propylene with 1 to 5% ethylene and 6 to 15% C.sub.4 -C.sub.8 .alpha.-olefin.In the composition the total content of ethylene being 1% to 5% and of C.sub.4 -C.sub.8 .alpha.-olefin being 2.4% to 12%.