Abstract:
The invention provides a process for the preparation of a multimodal ethylene polymer in a multistage process in the presence of a catalyst comprising a complex of formula (lx) wherein each X is a sigma donor ligand; each Het is independently a monocyclic or multicyclic heteroaromatic or heterocyclic group containing at least one heteroatom selected from O, N or S; L is a carbon, silicon or germanium based divalent bridge in which one or two backbone atoms link the ligands; M is Ti, Zr or Hf; each R1 is the same or different and is a linear CMO alkyl group, or linear CHO alkoxy, each n is 0 to 3; each R2 is the same or different and is a C1-10 alkyl group, C1-10 alkoxy group or -Si(R)3 group; each R is the same or different and is C1-10 alkyl or phenyl group optionally substituted by 1 to 3 C1-6 alkyl groups; and eachp is 0 to 3;
Abstract:
Process for the preparation of a solid catalyst system (CS) comprising the steps of preparing a liquid clathrate (LC) comprising (a) a lattice (L) being the reaction product of (i) aluminoxane (A), (ii) an organometallic compound (O) of a transition metal (M) of Group 3 to 10 of the Periodic Table (IUPAC 2007) or of an actinide or lanthanide, and (i) a compound (B) being effective to form with the aluminoxane (A) and the organometallic compound (O) the lattice (L), and (b) a guest (G) being an hydrocarbon compound (HC), and subsequently precipitating said liquid clathrate (LC) obtaining said solid catalyst system (SC).
Abstract:
Process for the preparation of a solid catalyst system comprising the steps of generating an emulsion by dispersing a liquid clathrate in a solution wherein (i) the solution constitutes the continuous phase of the emulsion and (ii) the liquid clathrate constitutes in form of droplets the dispersed phase of the emulsion, solidifying said dispersed phase to convert said droplets to solid particles and optionally recovering said particles to obtain said catalyst system, wherein the liquid clathrate comprises a lattice being the reaction product of aluminoxane, an organometallic compound of a transition metal of Group 3 to 10 of the Periodic Table (IUPAC 2007) or of an actinide or lanthanide, and a further compound being effective to form with the aluminoxane and the organometallic compound the lattice, and a guest being an hydrocarbon compound, and the solution comprises a silicon fluid and a hydrocarbon solvent.
Abstract:
New, improved silica supported catalyst system, which comprises a specific class of metallocene complexes in combination with a boron containing cocatalyst and an aluminoxane cocatalyst, its use for producing propylene homopolymers, propylene copolymers, especially with ethylene, as well as heterophasic propylene copolymers, preferably in a multistep process including a gas phase polymerization step.
Abstract:
Supported Ziegler-Natta ethylene polymerisation procatalyst comprising special bi-(oxygen containing ring) compounds as internal donor,as well as a process for preparing the same and use of such a procatalyst for preparing a catalyst system used in the polymerisation of ethylene for producing high molecular weight polyethylenes.
Abstract:
A catalyst comprising (i) a metallocene complex of a group (IV) metal said metallocene comprising at least two cyclopentadienyl type ligands; (ii) a boron cocatalyst; and (iii) an aluminoxane cocatalyst; said catalyst being in solid form, preferably in solid particulate form, and being free from an external carrier.
Abstract:
Process for the preparation of a catalyst system comprising the steps of (a) preparing a solution (A) comprising (i) a transition metal compound of formula (I) L m R n M q wherein "M" is a transition metal of anyone of the groups 3 to 10 of the periodic table (IUPAC), each "X" is independently a monovalent σ-ligand, each "L" is independently an organic ligand which coordinates to the transition metal (M), "R" is a bridging group linking said organic ligands (L), "m" is 2 or 3, preferably 2, "n" is 0, 1 or 2, preferably 1, "q" is 1, 2 or 3, preferably 2, m+q is equal to the valency of the transition metal (M), (ii) a cocatalyst (Co) comprising an element (E) of group 13 of the periodic table (IUPAC), preferably a cocatalyst (Co) comprising a compound of A1, (iii) a solvent (A'), (b) generating an emulsion by dispersing the solution (A) in a solvent (B) and in the presence of a surfactant (S) wherein (i) the solvent (B) constitutes the continuous phase of the emulsion and (ii) the solution (A) constitutes in form of droplets the dispersed phase of the emulsion, (iii) the transition metal compound of formula (I) and the cocatalyst (Co) are present in the droplets, and (iv) the surfactant (S) is a reaction product (RP) of at least one compound of formula (II) and a compound (C) comprising an element (E) of group 13 of the periodic table (IUPAC), preferably a compound comprising A1, the formula (II) is wherein R 1 is a semi-, highly- or perfluorinated hydrocarbon residue, and R 2 is a residue selected from the group consisting of -C(R 3 )=C(R 3' )-R 4 , wherein R 3 , R 4 , R 3' , are independently from each other selected from the group consisting of H, C 1 to C 20 alkyl, C 2 to C 20 alkenyl, C 2 to C 20 alkinyl, (c) solidifying said dispersed phase to convert said droplets to solid particles and (d) optionally recovering said particles to obtain said catalyst system.
Abstract:
Process for the preparation of a polypropylene, wherein propylene is polymerised optionally with a comonomer selected from the group consisting of ethylene, a C 4 -C 20 α-olefin and mixtures thereof, in the presence of a catalyst system comprising solid catalyst particles, wherein the solid catalyst particles (a) comprise a transition metal compound of formula (I) L m R n MX q (I) wherein "M" is a transition metal of anyone of the groups 3 to 10 of the periodic table (IUPAC), each "X" is independently a monovalent anionic σ-ligand, each "L" is independently an organic ligand which coordinates to the transition metal (M), each "R" is a bridging group linking two organic ligands (L), "m" is 2 or 3, preferably 2, "n" is 0, 1 or 2, preferably 1, "q" is 1, 2 or 3, preferably 2, m+q is equal to the valency of the transition metal (M), (c) comprise a cocatalyst (Co) comprising an element (E) of group 13 of the periodic table (IUPAC), preferably a cocatalyst (Co) comprising a compound of Al, wherein further the loss of activity of the solid catalyst particles during polymerization is at most 20 %.
Abstract:
Multi-stage polymerization process for the production of a multi-modal linear low density polyethylene in at least two staged reactors connected in series comprising at least (i) polymerizing in a first slurry phase stage ethylene monomers and optionally one or more alpha- olefine comonomers, in the presence of a Ziegler-Natta polymerization catalyst system to obtain a first polyethylene fraction component (A) (ii) polymerizing in a second gas or slurry phase stage ethylene monomers and one or more alpha- olefine comonomers, in the presence of a Ziegler-Natta polymerization catalyst system to obtain a second polyethylene fraction component (B), whereby the Ziegler-Natta polymerisation catalyst system comprises C) a procatalyst, which procatalyst comprises a) an Al compound having the formula AI(alkyl) x CI 3-x (l), where alkyl is an alkyl group with 1 to 12 and 0 1 ) 2-n (R 2 ) n (II), wherein each R 1 and R 2 is independently a C 1-20 hydrocarbon residue which may optionally be substituted with halogen and O y Ti(OR 3 ) 4-y (III), wherein R 3 is a C 2-20 hydrocarbon residue and y is 1, 2, 3 or 4 and compounds a), b) and c) being deposited on a particulate inorganic support and D) a halogenated aluminium alkyl cocatalyst of the formula (IV) (C 1 -C 4 -alkyl) m -AI-X 3-m , wherein X is chlorine, bromine, iodine or fluorine and m is 1 or 2, and yielding a multimodal linear low density polyethylene with a narrow molecular weight distribution, whereby the process shows a higher comonomer conversion compared to multi-stage processes using non-halogenated cocatalysts.
Abstract:
Multi-stage polymerization process for the production of a multi-modal linear low density polyethylene in at least two staged reactors connected in series comprising at least (i) polymerizing in a first slurry phase stage ethylene monomers and optionally one or more alpha-olefine comonomers, in the presence of a Ziegler-Natta polymerization catalyst system to obtain a first polyethylene fraction component (A) (ii) polymerizing in a second gas or slurry phase stage ethylene monomers and one or more alpha-olefine comonomers, in the presence of a Ziegler-Natta polymerization catalyst system to obtain a second polyethylene fraction component (B), whereby the Ziegler-Natta polymerization catalyst system comprises 1) a solid procatalyst formed by contacting at least: a) a Mg-alcoholate complex of the formula (I): Mg(OR 1 ) 2-n (R 1 ) n , wherein each R 1 independently represents a C 1 -C 20 hydrocarbyl group and 0 ≤ n 2 ) m X 3-m , wherein each R 2 independently represents an alkyl of up to 6 carbon atoms; each X is independently a halogen; 0 ≤ m 1 -C 20 -alkyl group, 0 ≤ x ≤ 2; 1 ≤ y ≤ 3; 0 ≤ z ≤ 2 and x + y + z = 3; x, y and z may or may not be an integer, yielding a multi-modal polyethylene, whereby the process shows a reduced change of comonomer response with polymerization time and a more stable comonomer conversion with polymerization time compared to multistage processes using Ziegler-Natta catalysts with 100% Ti.
Abstract translation:用于在至少两个串联反应器中连续串联生产多模式线性低密度聚乙烯的多级聚合方法,包括至少(i)在第一浆料相阶段聚合乙烯单体和任选的一种或多种α-烯烃共聚单体 在齐格勒 - 纳塔聚合催化剂体系存在下,得到第一聚乙烯级分组分(A)(ⅱ)在第二种气相或淤浆相阶段中聚合乙烯单体和一种或多种α-烯烃共聚单体,在 齐格勒 - 纳塔聚合催化剂体系,得到第二聚乙烯组分(B),其中齐格勒 - 纳塔聚合催化剂体系包括:1)通过使至少与下列物质接触而形成的固体前催化剂:a)式(I)的Mg-醇化物络合物, :Mg(OR1)2-n(R1)n,其中每个R1独立地表示C1-C20烃基,0 = n2)mX3-m,其中每个R2独立地表示至多6个碳原子的烷基; 每个X独立地是卤素; 0 = m <3和m,并且可以是或不是整数,c)钒化合物和钛化合物,以提供V:Ti的摩尔比为10:90至90:10,以产生 固体前催化剂和2)式(III)的一种或多种有机金属助催化剂,其中每个R独立地为C 1 -C 20 - 烷基,0 = x = 2; 1 = y = 3; 0 = z = 2,x + y + z = 3; x,y和z可以是或不是整数,产生多峰聚乙烯,由此与使用齐格勒 - 纳塔(Ziegler-Natta)的多阶段方法相比,该方法显示了聚合时间下共聚单体响应的变化减小和聚合时间的更稳定的共聚单体转化 具有100%Ti的催化剂。