PROPYLENE HOMOPOLYMER AND BIAXIALLY STRETCHED FILM PRODUCED THEREFROM

摘要

PURPOSE: To obtain a propylene homopolymer which is heat-resistant and gives a biaxially stretched polypropylene film improved in stretchability, clarity, and surface characteristics such as antistatic properties. CONSTITUTION: The homopolymer has an MI of 0.5-5g/10min, a pentad fraction fmmmm of 70-92mol% obtd. by<13> C-NMR, an isotactic index W (wt.%) satisfying the relation: W<0.35×fmmmm +65, and an m.p. Tm ( deg.C) and a heat of fusionΔH (J/g) satisfying the relation: Tm>0.5×ΔH+113.