Propylene copolymer for heat seal Characteristic film, heat seal Characteristic film, propylene copolymer and heat seal Characteristic container null for heat seal Characteristic container

摘要

PURPOSE: To obtain a propylene copolymer excellent in stiffness, surface hardness, heat resistance, impact strength, clarity, heat sealability, blocking resistance. and bleed-out resistance. ;CONSTITUTION: The copolymer comprises 95-99.5mol% propylene units and 0.5-5mol% ethylene units and has a triad tacticity of propylene chains comprising head-to-tail-bonded propylene units (obtd. by ¹³C-NMR) of 95.0 % or higher, a ratio of position-irregular units due to 2,1-insertion of propylene units to all the propylene units inserted (obtd. by ¹³C-NMR) of 0.05-0.5%, and an intrinsic viscosity [η] (measured in decalin at 135°C) of 0.1-12dl/g.;COPYRIGHT: (C)1996,JPO