摘要:
A process for the (co)polymerization of propylene carried out at a temperature ranging from 77 to 95° C. in the presence of a catalyst comprising the product obtained by reacting: —an organo-aluminium compound, with—-a solid catalyst component comprising Mg, Ti and electron donor compound selected from specific diolesters.
摘要:
A process for the preparation of high purity propylene polymers carried out in the presence of a catalyst comprising the product obtained by reacting:—an organo-aluminium compound, with—a solid catalyst component comprising Mg, Ti and electron donor compound selected from specific diolesters, said process being carried out employing an organo-aluminum/propylene ratio equal to or lower than 1.75 mmole/kg.
摘要:
A porous solid catalyst component 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 and the other being selected from succinates, characterized by the fact that the molar ratio ID/Ti is from 0.30 to 0.90, where ID is the total molar amount of succinate and 1,3-diether, the molar ratio of the 1,3-diether donor to the succinate donor is higher than, or equal to, 0.60.
摘要:
A catalyst system comprising the product obtained by contacting (a) a solid catalyst component containing Mg, Ti, halogen and at least an electron donor compound selected from diolesters of a specific formula (b) an alkylaluminum cocatalyst and (c) an ester of formula R′OOC—(CR″2)m—COOR′ in which m is an integer from 2 to 8, the R′ groups, equal to or different from each other, are C1-C10 alkyl groups and the R″ groups, independently, are hydrogen or C1-C15 hydrocarbon groups.
摘要:
A catalyst system comprising the product obtained by contacting (a) a solid catalyst component containing Mg, Ti, halogen and at least an electron donor compound selected from 1,3-diethers; (b) an alkylaluminum cocatalyst; and (c) an ester of formula ROOC—(CH2)n—COOR in which n is an integer from 2 to 8, R groups, equal to or different from each other, are C1-C10 alkyl groups.
摘要:
Catalyst components for the polymerization of olefins CH2=CHR wherein R is hydrogen or a hydrocarbon radical having 1-12 carbon atoms, comprising Mg, Ti, Cl and a diol or a derivative thereof. A process for the use of catalyst components for the polymerization of olefins CH2=CHR wherein R is hydrogen or a hydrocarbon radical having 1-12 carbon atoms, comprising Mg, Ti, Cl and a diol or a derivative thereof.
摘要:
Solid adducts comprising a MgCl2, ethanol and a compound (A), said compounds being present in molar ratios defined by the following formula MgCl2.(EtOH)n(A)p in which n is from 0.1 to 6, p ranges from 0.001 to 0.5 and A is a compound selected from cyclic hydrocarbon structures which are substituted with at least two hydroxy groups.
摘要:
Catalyst component for the polymerization of olefins CH2═CHR in which R is hydrogen or a hydrocarbyl radical with 1-12 carbon atoms, comprising Mg, Ti, halogen and two electron donor compounds one of which selected those of formula (I) wherein: R2, equal to or different from each other, are hydrogen atoms or C1-C20 hydrocarbon radicals optionally containing heteroatoms belonging to groups 13-17 of the periodic table of the elements or alkoxy groups of formula —OR1, two or more of the R2 groups can be connected together to form a cycle; R1, equal to or different from each other, are C1-C20 hydrocarbon radicals optionally containing heteroatoms belonging to groups 13-17 of the periodic table of the elements, with the proviso that at least one of R2 is —OR1 and the other being selected from succinates of formula (II): wherein the radicals RI and RII, 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; the radicals RIII to RVI equal to or different from each other, are hydrogen or a C1-C20 linear or branched alkyl, alkenyl, cycloalkyl, aryl, arylalkyl or alkylaryl group, optionally containing heteroatoms, and the radicals RIII to RVI which are joined to the same carbon atom of the succinate chain can be linked together to form a cycle.
摘要:
Catalyst component for the polymerization of olefins CH2═CHR in which R is hydrogen or a hydrocarbyl radical with 1-12 carbon atoms, comprising Mg, Ti, halogen and two electron donor compounds one of which selected from alkoxybenzenes and the other being selected from those of formula (II) where RI and RII are the same or different and are hydrogen or linear or branched C1-C18 hydrocarbon groups which can also form one or more cyclic structures; RIII groups, equal or different from each other, are hydrogen or C1-C18 hydrocarbon groups; RIV groups equal or different from each other, have the same meaning of RIII except that they cannot be hydrogen; each of RI to RIV groups can contain heteroatoms selected from halogens, N, O, S and Si.
摘要:
Process for the preparation of ethylene polymers having narrow MWD characterized by a F/E ratio lower than 35 carried out in the presence of a catalyst system comprising (a) a solid catalyst component comprising Ti atoms that are substantially in the +4 oxidation state, Mg, Cl, and optionally OR groups and internal donors in which R is a C1-C20 hydrocarbon group, in which the OR/Ti molar ratio is equal to or lower than 0.35 and the internal donor/Ti ratio is lower than 1, (b) an aluminum alkyl compound and (c) a compound selected from alkoxybenzenes of specified formula.