Olefin copolymers and processes for preparing same

摘要

The present invention provides a propylene random copolymer comprising structural units (a) derived from propylene and structural units (b) derived from an alpha -olefin of 4 to 20 carbon atoms, and having (i) the structural units (a) in an amount of 90 to 99 mol% and the structural units (b) in an amount of 1 to 10 mol%, (ii) an intrinsic viscosity [ eta ] as measured in decaline at 135 DEG C of 0.5 to 6 dl/g, (iii) a melting point [Tm] as measured by a differential scanning calorimeter falling within the range of 90 < Tm < 155 - 3.5 (100 - P) wherein P is the propylene content (mol%) present in the copolymer, (iv) a ratio (Mw/Mn) of a weight average molecular weight (Mw) to a number average molecular weight (Mn) as measured by gel permeation chromatography of less than 3.5, and (v) a boiling trichloroethylene-insoluble content of less than 5% by weight.