Patent ID: 6448350
Filing Date: 2002-09-10
Classification: C08F

Abstract:
A process for the preparation of copolymers of ethylene having a reactivity r1*r2 lower than 0.30, wherein r1 is the relative reactivity if the comonomer versus ethylene and r2 is the relative reactivity of ethiylene, md an intrinsic viscosity (I.V.) higher than 0.5 dl/g measured in tertralin at 135Â° C., comprising the polymerization reaction of ethylene with at least one alpha-oleflin, and optionally with one or more polyenes, in the presence of a catalyst obtained by contacting:(A) a metallocene compound of the formula (I): whereinsubstituents R1 are hydrogen atoms or C1-C10-alyl groups, substituents R2 are CHR10R11, SiR12R13R14 or GeR15R16R17 groups, wherein R10, R11, R12, R15 are hydrogen atoms, C1-C20-alkyl, C3-C20-cycloalkyl, C2-C20-alkenyl, C6-C20-aryl, C7-C20-alkylaryl or C7-C20-arylalkyl radicals, optionally containing silicon or germanium atoms; R13, R14, R16, R17 are C1-C20-arylakyl, C3-C20-cycloalkyl, C2-C20-alkenyl, C6-C20-aryl, C7-C20-alkylaryl or C7-C20-arylalkyl radicals, optionaly containing silicon or germanium atoms; R3 and R4, same or different, are hydrogen atoms or CHR5W6 groups; R3 and R4 can form a ring having 3 to 8 carbon atoms which can contain hetero atoms, R5 and R6, same or different are hydrogen atoms, C1-C20-alkyl, C3-C20-cycloalkyl, C2-C20-alkenyl, C6-C20-aryl, C7-C20-alkylaryl or C7-C20-arylalkyl radicals, which can form a ring having 3 to 8 carbon atoms which can contain hetero atoms; the R7 substituents, same or different, are C1-C20-alkyl, C3-C20-cycloalkyl, C2-C20-alkenyl, C6-C20-aryl, C7-C20-anlkylaryl or C7-C20-alkylaryl radicals, optionally contaning silicon or germanium atoms; and optionally two adjacent R7 substituents can form a ring comprising from 5 to 8 carbon atoms, n being an integer from 0 to 4; M is a tradtion metal atom selected from the group consiing of the atoms of groups 3, 4, 5, 6, and the lanthanide and actinide groups of the Periodic Table of the Elements (new IUPAC version), X same or different, is a mono anionic ligand selected from the group consisting of a hydrogen atom, a halogen atom, an R8, OR8, OSO2CF3, OCOR8, SR8, NR82 and PR82 group, wherein the substituents R8 are a C1-C20-alkyl, C3-C20-cycloalkyl, C2-C20-alkenyl, C6-C20-aryl, C7-C20-alkylaryl or C7-C20-arylalkyl radical, optionally containig silicon or germanium atoms, p is an integer of from 0 to 3, being equal to the oxidation state of the metal M minus two; and (B) an aloxane andor a compound capable of fdrming an alkyl metallocene cation.