Patent ID: 6201090
Filing Date: 2001-03-13
Classification: C08F

Abstract:
A propylene-ethylene block copolymer characterized by the following (a), (b) and (c):(a) its melt flow rate (MFR) (at 230.degree. C. under a load of 2.16 kg) falls between 0.01 and 1000 g/10 min;(b) the room-temperature xylene-insoluble component thereof, as measured through .sup.13 C-NMR, has a stereospecificity index [mmmm] fraction of not smaller than 98.9%; and(c) the room-temperature xylene-soluble component thereof is characterized by the following (c1), (c2) and (c3):(c1) its amount falls between 3 and 50% by weight;(c2) the T1 relaxation time component thereof, as measured through pulse NMR, is of a single relaxation component; and(c3) the ethylene content thereof, x % by weight, as measured through .sup.13 C-NMR, and the T1 relaxation time for it, y (milliseconds), as measured through pulse NMR, satisfy the following relational formula (I):y.ltoreq.0.0014x.sup.3 -0.0897x.sup.2 -1.0593x+231.6 (I).