Patent ID: 8138293
Filing Date: 2012-03-20
Classification: C08F,Y10S

Abstract:
1. A process for preparing a copolymer, the process comprising: copolymerizing a monomer comprising ethene and a comonomer comprising 3-methybut-1-ene, in the presence of a cocatalyst comprising an aluminum- or boron-comprising compound and a catalyst of formula I wherein: Cp* is selected from the group consisting of a substituted cyclopentadienyl group, an unsubstituted cyclopentadienyl group, an unsubstituted indenyl group, a substituted indenyl group, an unsubstituted tetrahydroindenyl group, a substituted tetrahydroindenyl group, an unsubstituted octahydrofluorenyl group, a substituted octahydrofluorenyl group, an unsubstituted fluorenyl group, and a substituted fluorenyl group; Y is selected from the group consisting of a substituted cyclopentadienyl group, an unsubstituted cyclopentadienyl group, an unsubstituted indenyl group, a substituted indenyl group, an unsubstituted tetrahydroindenyl group, a substituted tetrahydroindenyl group, an unsubstituted octahydrofluorenyl group, a substituted octahydrofluorenyl group, an unsubstituted fluorenyl group, and a substituted fluorenyl group, or an anionic ligand group comprising nitrogen, phosphorus, oxygen, or sulfur, and up to 20 atoms which are not hydrogen, wherein Cp* and Y are optionally joined to one another covalently or via a Z group; Z is boron or a group which comprises an element of group 14 of the Periodic Table of the Elements and has up to 20 atoms which are not hydrogen atoms; M is a metal of group 3 to 10, with the exception of scandium, or of the lanthanoids, of the Periodic Table of the Elements; X is in each case independently a halogen atom, a pseudohalogen, a hydrogen atom, a silyl group, a phosphide, a sulfide, or an organic radical; and m is a number which is sufficient to saturate the valences of M with the X, wherein the copolymer produced comprises 1 to 10 mol% 3-methylbut-1-ene and has a melting point between 90 and 130° C. and a weight average molar mass of 6500 to 8500 g/mol, or wherein the copolymer produced comprises 0.5 to 6 mol% 3-methylbut-1-ene and has a melting point between 90 and 130° C. and a weight average molar mass of 10,000 to 500,000 g/mol, or wherein the copolymer produced comprises 3 to 6 mol% 3-methylbut-1-ene and has a melting point between 90 and 115° C. and a weight average molar mass of 15,000 to 75,000 g/mol, with the proviso that the compound of formula I is not [Me