| abstract |
PURPOSE: A propylene polymer composition, containing a specific propylene homopolymer and a propylene-ethylene random copolymer in a specific proportion, and having improved rigidity, heat resistant shrinkage, impact resistance, transparency, drawing workability and heat resistance. n CONSTITUTION: A composition obtained by incorlporating 30W70pts.wt. propylene homopolymer, obtained by first polymerizing propylene in the presence of a catalyst formed from a highly active titanium catalyst component consisting of magnesium, titanium, a halogen and an electron donor, an organoaluminum compound catalyst component and an organosilicon compound catalyst component having Si-O-C bonds or Si-N-C bonds in two stages, and preferably having 96.5% Iso value with 30W70pts.wt. propylene-ethylene random copolymer, obtained by copolymerizing subsequently propylene randomly with ethylene, and having 0.3W 3.0mol% ethylene content (Ec mol%) and Iso ≥95.0W0.67 Ec to give the total amount of 100pts.wt. n COPYRIGHT: (C)1984,JPO&Japio |