| abstract |
Disclosed are propylene copolymers produced by the aid of a specificnmetallocene catalyst system, wherein a percentage of mis-insertion in the copolymer isnhighly controlled and the copolymers possess heat-resisting property and a high meltnstrength and a low MFR and are narrow in molecular weight distribution excellent innparticulate properties as well as a process for producing the copolymers possessingnhigh steroregularity at a practical polymerization temperature. The gist of the presentninvention resides in production of propylene copolymers wherein copolymerization*nwith α,ω-diene is carried out by the aid of a supported-type catalyst systemncomprised predominantly of the following compound (A), (B), (C) and (D) at antemperature above 45°C:n the compound (A): a specific metallocene compound represented byn Q (C 5 H 4-m R 1 m ) (C 5 H 4-n R 2 n ) MXY, the compound (B): an aluminoxane, the compound (C): an organoaluminum compound, and the compound (D): a particulate carrier. nAn important feature of the propylene copolymers of the present invention resides innthe fact that the copolymers are highly stereoregular and have a ratio of a mis-insertednunit based on 2,1-insertion of propylene monomer in the total propyleneninsertion being defined within a specific range. |