Propylene block copolymer, process for preparation thereof and p

Details Propylene block copolymer, process for preparation thereof and p Propylene block copolymer, process for preparation thereof and p

1996-06-26

1998-06-02

Warzel, Mark L.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Mixing of two or more solid polymers; mixing of solid...

525 89, 525 98, 524505, C08L 2300, C08F21000

Patent

active

057601410

ABSTRACT:
A propylene block copolymer, a process for preparation of the propylene block copolymer, and a propylene resin composition comprising the propylene block copolymer. The propylene block copolymer comprises (a) from 35 to 95% by weight of a polypropylene block and (b) from 10 to 65% by weight of a block of a copolymer of a propylene and other .alpha.-olefins, the propylene block copolymer having: (i) in a crystallization temperature curve determined by a differential scanning calorimeter, besides a main peak, secondary peaks in a temperature range of from 90.degree. to 100.degree. C., and a proportion of the area of the secondary peaks to that of a main peak of from 1.5 to 10%; and (ii) a relationship between an amount of a soluble content on xylene extraction at 25.degree. C. and a proportion of the area of the secondary peaks to that of the main peak represented by equation (I):

REFERENCES:
Macromolecular Rapid Communications, vol. 15, 1995, Zug, CH, pp. 247-252, "Synthesis of polypropene-block-poly(ethylene-co-propene) by short-period polymerization with MgC12-supported Ziegler catalyst".

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