Isotactic polypropylene produced from supercritical...

Details Isotactic polypropylene produced from supercritical... Isotactic polypropylene produced from supercritical...

2007-12-20

2010-10-05

Rabago, Roberto (Department: 1796)

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

Synthetic resins

Polymers from only ethylenic monomers or processes of...

C526S073000, C526S134000, C526S160000

Reexamination Certificate

active

07807769

ABSTRACT:
This invention relates to an isotactic propylene homopolymer having:more than 15 and less than 100 regio defects (sum of 2,1-erythro and 2,1-threo insertions and 3,1-isomerizations) per 10,000 propylene units;an Mw of 35000 g/mol or more;a peak melting temperature of greater than 149° C.;an mmmm pentad fraction of 0.85 or more;a heat of fusion of 80 J/g or more; anda peak melting temperature minus peak crystallization temperature (Tmp−Tcp) of less than or equal to (0.907 times Tmp) minus 99.64 (Tmp−Tcp<(0.907×Tmp)−99.64), as measured in ° C. on the homopolymer having 0 wt % nucleating agent.

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