摘要:
A process for the preparation of a random propylene copolymer comprising polymerising propylene and at least one C2-10 alpha olefin (especially ethylene) in the presence of a catalyst; wherein said catalyst comprises: (i) a complex of formula (I): wherein M is zirconium or hafnium; each X is a sigma ligand; L is a divalent bridge selected from —R′2C—, —R′2C—CR′2—, —R′2Si—, —R′2Si—SiR2—, —R′2Ge—, wherein each R′ is independently a hydrogen atom, C1-C20-hydrocarbyl, tri(C1-C20-alkyl)silyl, C6-C20-aryl, C7-C20-arylalkyl or C7-C20-alkylaryl; each R1 is a C4-C20 hydrocarbyl radical branched at the β-atom to the cyclopentadienyl ring, optionally containing one or more heteroatoms belonging to groups 14-16, or is a C3-C20 hydrocarbyl radical branched at the β-atom to the cyclopentadienyl ring where the β-atom is an Si-atom; n is 0-3; each R18 is the same or different and may be a C1-C20 hydrocarbyl radical optionally containing one or more heteroatoms belonging to groups 14-16; each R4 is a hydrogen atom or a C1-6-hydrocarbyl radical; each W is a 5 or 6 membered aryl or heteroaryl ring wherein each atom of said ring is optionally substituted with an R5 group; each R5 is the same or different and is a C1-C20 hydrocarbyl radical optionally containing one or more heteroatoms belonging to groups 14-16; and optionally two adjacent R5 groups taken together can form a further mono or multicyclic ring condensed to W optionally substituted by one or two groups R5; and (ii) a cocatalyst comprising an organometallic compound of a Group 13 metal.
摘要:
A 1-butene/propylene copolymer composition having a content of propylene derived units from 4 to 10% by weight, wherein at least 50% of the polymer is present in the thermodynamically stable, trigonal form I after 100 hours at room temperature, said composition comprising: a) from 5% by weight to 95% by weight of an atactic 1-butene propylene copolymer having the following features: i) distribution of molecular weight Mw/Mn equal to or lower than 4; ii) no enthalpy of fusion detectable at a differential scanning calorimeter (DSC); and iii) infrared crystallinity lower than 0.5%; b) from 5% by weight to 95% by weight of an isotactic 1-butene propylene copolymer having the following features: i) isotactic pentads (mmmm) measured by 13C-NMR, higher than 80%; ii) melting point (Tm(II)) higher than 70° C.; and iii) distribution of molecular weight Mw/Mn equal to or lower than 4.
摘要:
A process for preparing a polymer containing derived units of one or more alpha olefins of formula CH2═CHW wherein W is a C3-C10 hydrocarbon radical and optionally from 0 to 81% by mol of derived units of propylene or 1-butene, comprising contacting under polymerization conditions one or more alpha olefins of formula CH2═CHW and optionally propylene or 1-butene in the presence of a catalyst system obtainable by contacting:a) a metallocene compound of formula (I) wherein M, X, L, T, R1, R2, R7 and R8 are described in the text; and (b) an alumoxane or a compound capable of forming an alkyl metallocene cation.
摘要:
A 1-butene polymer composition comprising: a) from 10% to 90% by weight of an isotactic 1-butene polymer having the following features: i) isotactic pentad (mmmm) measured by 13C-NMR, higher than 90%; ii) melting point (TmII) higher than 90° C.; and iii) intrinsic viscosity (IV) measured in tetrahydronaphthalene (THN) at 135° C. comprised between 0.5 dl/g and 5.0 dl/g. b) from 90% to 10% by weight of a copolymer of 1-butene and at least a C8-C12 alpha-olefin derived units, containing from 0% to 10% by mole of propylene or pentene derived units, and/or containing from 0% to 5% by mole of ethylene derived units having a content of C8-C12 alpha-olefin derived units higher than 4.0% by mol and lower than 20.0% by mol; endowed with the following features: i) isotactic pentad mmmm higher than or equal to 90%; pentads (mmrr+mrrm) lower than 4 and pentad rmmr not detectable by C NMR. ii) intrinsic viscosity (IV) measured in tetrahydronaphthalene at 135° C. comprised between 0.8 and 5.0 dL/g; iii) the melting point measured by DSC (TmI) and the C8-C12 alpha-olefin content fulfil the following relationship: TmI
摘要:
A terpolymer of 1-butene, ethylene and a at least a C8-C12 alpha-olefin derived units, containing from 0.1% to 5% by mole of ethylene derived units and from 1 from 20% by mol of C8-C12 alpha-olefin derived units, endowed with the following properties: i) isotactic pentad mmmm higher than or equal to 90%; pentads (mmrr+mrrm) lower than 4 and pentad rmmr not detectable by 13C NMR. ii) intrinsic viscosity (IV) measured in tetrahydronaphthalene at 135° C. comprised between 0.8 and 5.0 dL/g; iii) the melting point measured by DSC (TmI) and the C8-C12 alpha-olefin content fulfil the following relationship: TmI
摘要:
A catalyst system solution obtainable by a process comprising the following steps: (a) contacting a solution of methylalumoxane in an aromatic solvent (solvent a) with a solution of one or more organo-aluminium in a solvent (solvent b), or a solution of one or more alumoxanes different from methylalumoxane in a solvent (solvent b); (b) when solvent b) is an aromatic solvent or if solvent b) has a boiling point lower than solvent a) add to the solution formed in step a) an alifatic solvent (solvent c) having a boiling point higher than solvent a) and solvent b); or (c) solubilizing a metallocene compound in the solution obtained in step a) or in step b); and (d) substantially removing solvent a) or solvent a) and solvent b) from the solution.
摘要:
A bridged metallocene compound of formula (I) wherein: M is a transition metal; X, is a hydrogen atom, a halogen atom, or a hydrocarbon group optionally containing heteroatoms; L is a divalent bridging group; R1 is a linear C1-C40 hydrocarbon radical optionally containing heteroatoms; T1 and T4 are a oxygen, sulfur atom or a C(R18)3 group; wherein R18, are hydrogen atoms or a C1-C40 hydrocarbon radical; T3 and T4 are C1-C40 hydrocarbon radicals; R4 is a hydrogen atom or a C1-C40 hydrocarbon radical; W is an aromatic 5 or 6 membered ring.
摘要:
A process for obtaining 1-butene polymers comprising the step of contacting under polymerization conditions 1-butene and optionally ethylene, propylene or said alpha-olefin, in the presence of a catalyst system obtainable by contacting: a) a metallocene compound of formula (I): wherein: M is an atom of a transition metal belonging to group 3, 4, 5, 6 or to the lanthanide or actinide groups in the Periodic Table of the Elements; p is an integer from 0 to 3; X, is a hydrogen atom, a halogen atom, or a hydrocarbon group; R1 is a hydrocarbon group; R2, R3 and R6 are hydrogen atoms or hydrocarbon groups; R4 and R5 join to form a condensed saturated or unsaturaded 4–7 membered ring; and L is a divalent bridging group; and b) an alumoxane or a compound able to form an alkylmetallocene cation.
摘要:
A process for polymerizing 1-butene comprising the step of contacting under polymerization conditions 1-butene and optionally from 0 to 20% by mol of an alpha olefin with a catalyst system obtainable by contacting a bridget metallocene compound of formula (I) wherein R1 and R2 are an hydrocarbon radical A is a carbon atom, a germanium atom or a silicon atom; m is 1, 2; M is a metal of group 4 of the Periodic Table of the Elements; X, is hydrogen, a halogen atom, or a group R, OR, OSO2CF3, OCOR, SR, NR2 or PR2, wherein the substituents R are hydrocarbon radical; L is a moiety of formula (IIa) or (IIb) wherein T is an oxigen (O) or sulphur (S) atom or a CH2 group; and R3 and R4 are hydrogen atoms or hydrocarbon radicals; one or more alumoxanes or compounds able to form an alkylmetallocene cation; and optionally an organo aluminium compound.
摘要:
An isotactic 1-butene copolymer having a content up to 30% by mol of at least one alpha-olefin of formula CH2═CHZ derived units, wherein Z is a C3-C20 hydrocarbon group, having the following features: isotactic pentads (mmmm) >90%; and a percentage of soluble fraction in diethylether (% SD) and a molar content of said alpha olefins (% O) in the polymer chain meeting the following relation: % SD>2.8% O+8.