High crystallinity, high melt flow rate polypropylene

Details High crystallinity, high melt flow rate polypropylene High crystallinity, high melt flow rate polypropylene

2007-05-30

2008-12-16

Choi, Ling-Siu (Department: 1796)

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

Synthetic resins

Polymers from only ethylenic monomers or processes of...

C526S142000, C526S125300, C526S124300, C526S158000

Reexamination Certificate

active

07465776

ABSTRACT:
High melt flow rate high crystallinity polypropylene homopolymer are produced in a bulk polymerization process using a Ziegler-Natta catalyst containing a combination of two internal electron donors and selected external donors. The high melt flow rate, high crystallinity polypropylene homopolymers produced according to the current invention display improved flexural modulus and tensile yield stress when nucleated.

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