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AssigneeHoechst Aktiengesellschaft
InventorsAndreas Winter, Volker Dolle, J urgen Rohrmann, Walter Spaleck, Martin Antberg
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A syndiotactic propylene copolymer is obtained in high yields by copolymerization of propylene with small amounts of other olefins in the presence of a catalyst comprising a metallocene of the formula I ##STR1## in which M.sup.1 is titanium, zirconium, hafnium, vanadium, niobium or tantalum and an aluminoxane. This copolymer has a very high molecular weight, a very narrow molecular weight distribution, very high syndiotaxicity, advantageously low melting points and rubber-like behavior. Molded articles produced from the polymer are distinguished by high transparency, flexibility and tear strength. Their main areas of application are packagings of any type.
A process for the preparation of a syndiotactic propylene copolymer comprising 99.9 to 50% by weight, relative to the entire polymer, of propylene units and 0.1 to 50% by weight, relative to the entire polymer, of units derived from ethylene or an olefin having at least 4 carbon atoms of the formula R.sup.a --CH.dbd.CH--R.sup.b, in which R.sup.a and R.sup.b are identical or different and are a hydrogen atom or an alkyl radical having 1 to 20 carbon atoms or R.sup.a and R.sup.b together with the carbon atoms linking them form a ring of 4 to 10 carbon atoms, said process comprising polymerization of 50 to 99.5% by weight, relative to the total amount of the monomers, of propylene and 0.5 to 50% by weight, relative to the total amount of the monomers, of at least one representative from the group comprising ethylene and olefins having at least 4 carbon atoms of the formula R.sup.a --CH.dbd.CH--R.sup.b, in which
A process for the preparation of a syndiotactic propylene copolymer comprising 99.9 to 50% by weight, relative to the entire polymer, of propylene units and 0.1 to 50% by weight, relative to the entire polymer, of units derived from ethylene or an olefin having at least 4 carbon atoms of the formula R.sup.a --CH.dbd.CH--R.sup.b, in which R.sup.a and R.sup.b are identical or different and are a hydrogen atom or an alkyl radical having 1 to 20 carbon atoms or R.sup.a and R.sup.b together with the carbon atoms linking them form a ring of 4 to 10 carbon atoms, said process comprising polymerization of 50 to 99.5% by weight, relative to the total amount of the monomers, of propylene and 0.5 to 50% by weight, relative to the total amount of the monomers, of at least one representative from the group comprising ethylene and olefins having at least 4 carbon atoms of the formula R.sup.a --CH.dbd.CH--R.sup.b, in which R.sup.a and R.sup.b have the above mentioned meaning, at a temperature of -40.degree. C. to 150.degree. C. and a pressure of 0.5 to 100 bar in solution, in suspension or in the gas phase, in the presence of a catalyst which comprises a metallocene as the transition metal component and an aluminoxane of the formula II ##STR17## for the linear type and/or the formula III ##STR18## for the cyclic type, R.sup.9 in formulae II and III being a C.sub.1 -C.sub.6 -alkyl group or phenyl or benzyl and n an integer from 2 to 50, which comprises carrying out the polymerization in the presence of a catalyst whose transition metal component is a metallocene, wherein said metallocene compound is (arylalkylidene)(9-fluorenyl)(cyclopentadienyl) zirconium dichloride, (diarylmethylene)(9-fluorenyl)(cyclopentadienyl)zirconium dichloride or (dialkylmethylene)(9-fluorenyl)(cyclopentadienyl) zirconium dichloride or the corresponding hafnium analogs of said metallocene compounds.
A process for the preparation of a syndiotactic propylene copolymer comprising 99.9 to 50% by weight, relative to the entire polymer, of propylene units and 0.1 to 50% by weight, relative to the entire polymer, of units derived from ethylene or an olefin having at least 4 carbon atoms of the formula R.sup.a --CH.dbd.CH--R.sup.b, in which R.sup.a and R.sup.b are identical or different and are a hydrogen atom or an alkyl radical having 1 to 20 carbon atoms or R.sup.a and R.sup.b together with the carbon atoms linking them form a ring of 4 to 10 carbon atoms, said process comprising polymerization of 50 to 99.5% by weight, relative to the total amount of the monomers, of propylene and 0.5 to 50% by weight, relative to the total amount of the monomers, of at least one representative from the group comprising ethylene and olefins having at least 4 carbon atoms of the formula R.sup.a --CH.dbd.CH--R.sup.b, in which R.sup.a and R.sup.b have the above mentioned meaning, at a temperature of -40.degree. C. to 150.degree. C. and a pressure of 0.5 to 100 bar in solution, in suspension or in the gas phase, in the presence of a catalyst which comprises a metallocene as the transition metal component and an aluminoxane of the formula II ##STR19## for the linear type and/or the formula III ##STR20## for the cyclic type, R.sup.9 in formulae II and III being a C.sub.1 -C.sub.6 -alkyl group or phenyl or benzyl and n an integer from 2 to 50, which comprises carrying out the polymerization in the presence of a catalyst whose transition metal component is a metallocene, wherein said metallocene compound is (methyl(phenyl)methylene)(9-fluorenyl)(cyclopentadienyl) zirconium dichloride, (diphenylmethylene)(9-fluorenyl)(cyclopentadienyl) zirconium dichloride, or (dimethylmethylene)(9-fluorenyl)(cyclopentadienyl)zirconium chloride or the corresponding hafnium analogs of said metallocene compounds.
Dependencies are inferred from the claim text.