Patent ID: 6326432
Filing Date: 2001-12-04
Classification: C08F,C08L

Abstract:
A polypropylene composition comprised of 20-95% by weight of a polypropylene defined in the following [I] and 5-80% by weight of a propylene-.alpha.-olefin copolymer defined in the following [II]:[I] a polypropylene featured by having:(1) a ratio of isotactic pentad (mmmm) is 0.900-0.949,(2) the 2,1- and 1,3-propylene units in the polymer chain is 0-1 mole %,(3) a weight average molecular weight (Mw) is 40,000-1,000,000,(4) a ratio of a weight average molecular weight (Mw) to a number average molecular weight (Mn), i.e. (Mw)/(Mn) is 1.5-3.8, and(5) in case of elevating the temperature of o-dichlorobenzene continuously or stepwise up to given temperatures to measure the amount of eluted polypropylene at each temperature, the position of a main elution peak is 95-110.degree. C. and the amount of components existing in the range of .+-.10.degree. C. of the main elution peak is at least 90% of the total amounts of components eluted at a temperature higher than 0.degree. C. and[II] a propylene-.alpha.-olefin copolymer containing 10-90% by weight of a constituent derived from propylene and 10-90% by weight of a constituent derived from .alpha.-olefin other than propylene.