Bridged metallocenes for olefin copolymerization

The invention relates to a a soluble with a metallocene catalyst for preparing the aliphatic series solvent, specifically suitable for the solution olefin polymerization method, which can be specifically under the polymerization temperature and catalyst activity of preparing olefin copolymer by weight average. The concrete, invention relates to a method for preparing density of the polymerization method for a 0.850~0.940 ethylene copolymer, comprising in the solution polymerization conditions, the reaction temperature is 60℃ or greater than 60℃ to 250℃, wherein the ethylene and one or more of inserted into the polymerized comonomer and with a metallocene catalyst preparation steps, the metallocene catalyst preparing derived from the group consisting of assistant, wherein each ligand is a substituted or un-substituted, wherein the ligand of comprises a substitution at least one group is connected with a connecting, wherein at least one of the substitution part comprises a aryl, Wherein the aryl at least comprises a hydrocarbyl) silyl group; A B) a first promoter.