Abstract:
Catalysts systems for the polymerization of olefins CH 2 =CHR, wherein R is an alkyl, cycloalkyl or aryl radical having 1-12 carbon atoms, comprising (A) a solid catalyst component comprising Ti, Mg, and halogen (B) an aluminum alkyl compound and (C) a halogenated cyclic ether compound show improved polymerization activity.
Abstract:
Catalyst components for the polymerization of olefins CH 2 =CHR wherein R is hydrogen or a hydrocarbon radical having 1-12 carbon atoms, comprising Mg, Ti, CI and a diol or a derivative thereof.
Abstract:
Catalyst components for the(co)polymerization of ethylene comprising Ti, Mg, halogen, ORI groups, where RI is a C1-C12 hydrocarbon group optionally containing heteroatoms, having ORI/Ti molar ratio in the range 0.1-1.5, a Mg/Ti molar ratio of less than 8, an amount of titanium, with respect to the total weight of said solid catalyst component, higher than 4% by weight characterized by a specific SS-NMR pattern are particularly useful for preparing narrow MWD crystalline ethylene polymers.
Abstract translation:含有Ti,Mg,卤素,ORI基团的乙烯(共)聚合的催化剂组分,其中RI是任选含有杂原子的C 1 -C 12烃基,ORI / Ti摩尔比在0.1-1.5范围内,Mg / Ti 摩尔比小于8,相对于所述固体催化剂组分的总重量,钛的量高于4重量%,其特征在于特定的SS-NMR图案,特别适用于制备窄MWD晶体乙烯聚合物。
Abstract:
A solid catalyst component for the polymerization of olefins 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 selected from 1,3 diethers (DE) and the other being selected from dicarbamates (DC), said catalyst component being characterized by the fact that said electron donor compounds are present in a molar ratio DE:DC ranging from 4.5:1 to 20:1.
Abstract:
A gas-phase process for the homo or copolymerization of propylene with other olefins, carried out in the presence of a catalyst system comprising: (a) a solid catalyst component comprising 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 compound selected from specific classes; said components (a) and (c) being employed in amounts such that the Al/(ED) molar ratio ranges from 2 to 200. The process is capable to give polypropylene product having good morphological properties, high stereoregularity, and capable to show self- extinguishing properties such that the negative effects caused by the fine catalyst particle polymerization can be selectively solved or mitigated.
Abstract:
A catalyst system for the (co)polymerization of olefins, comprising (A) a solid catalyst component comprising a titanium compound supported on magnesium dichloride (B) an aluminum alkyl compound and (C) an halogenated organic ester of formula A-COOR in which R is a C 1 C 10 hydrocarbon group and A is a C 1 C 5 saturated or unsaturated hydrocarbon group in which at least one of the hydrogen atoms is replaced by chlorine. Said catalyst systems has improved polymerization activity and reduced ethane generation.
Abstract:
A pre-polymerized catalyst component for the polymerization of olefins CH 2 =CHR, wherein R is hydrogen or a C1-C12 hydrocarbon group, characterized by comprising a non-stereospecific solid catalyst component, comprising Ti, Mg and a halogen, said pre-polymerized catalyst component containing an amount of a (co)polymer of a monomer having formula CH 2 =CHA, where A is a C6 aliphatic or aromatic ring, optionally substituted, up to 5g per g of said solid catalyst component. Said prepolymerized catalyst shows an excellent balance in terms of activity, morphological stability, reduced tendency to agglomeration and hydrogen response.
Abstract:
Catalyst components for the polymerization of olefins CH 2 =CHR wherein R is hydrogen or a hydrocarbon radical having 1-12 carbon atoms, comprising Mg, Ti, Cl and a compound (L) or its derivatives, selected from condensed cyclic structures which are formed by at least an aromatic ring and which are substituted with at least two hydroxy groups, said Cl and Ti atoms being in an amount such as to have a molar ratio ranging from 5 to 50.
Abstract:
A catalyst component comprising Ti, Mg, Al, Cl, and optionally OR I groups in which R I is a C1-C20 hydrocarbon group, optionally containing heteroatoms, up to an amount such as to give a molar OR I /Ti ratio lower than 0.5, characterized by the fact that substantially all the titanium atoms are in valence state of 4, that the porosity (P F ), measured by the mercury method and due to pores with radius equal to or lower than 1μm, is at least 0.3 cm 3 /g, and by the fact that the Cl/Ti molar ratio is lower than 29. The said catalysts are characterized by high morphological stability under the low molecular weight ethylene polymerization conditions while at the same time maintaining characteristics of high activity.
Abstract:
A process for preparing crystalline ethylene (co)polymers comprising (co)polymerizing ethylene in the presence of carried out in the presence catalyst system comprising (a) a solid catalyst component comprising Ti, Mg, halogen, ORI groups, where RI is a C1-C12 hydrocarbon group optionally containing heteroatoms, having ORI/Ti molar ratio of at least 0.5, an amount of titanium, with respect to the total weight of said solid catalyst component, higher than 4% by weight, and showing a specific pattern of the SS-NMR; and (b) an aluminum alkyl compound as a cocatalyst. The process allows to obtain in good yelds ethylene polymers with narrow MWD.