Patent ID: 6503993
Filing Date: 2003-01-07
Classification: C08F,C08L

Abstract:
A nucleated propylene polymer containing 0.0001 to 1 wt-% of a polymerized vinyl compound having the formula wherein R1 and R2 together form a 5 or 6 membered saturated or unsaturated or aromatic ring, comprising a propylene homopolymer or a homopolymer matrix of a block copolymer having a xylene soluble fraction at 23Â° C. of less than 2.5%, a crystallization temperature of over 126Â° C., and a degree of crystallization of more than 50%, wherein the tensile modulus of the homopolymer or homopolymer matrix is greater than 2,000 MPa, said polymer being produced by polymerization of propylene optionally with comonomers in the presence of a transesterified Ziegler-Natta catalyst system modified with a polymerized vinyl compound and comprising a strongly coordinating external donor, and said polymer containing less than 0.01 wt-ppm of any unpolymerized vinyl compound.