Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Polymers from only ethylenic monomers or processes of...
Reexamination Certificate
2006-04-04
2006-04-04
Choi, Ling-Sui (Department: 1713)
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Polymers from only ethylenic monomers or processes of...
C526S142000, C526S124200, C526S124300, C526S158000
Reexamination Certificate
active
07022796
ABSTRACT:
A method of preparing ultra high melt flow polypropylene having reduced xylene solubles is provided. The method utilizes a diether internal donor-containing Ziegler-Natta catalyst system to polymerize propylene. The polypropylene produced is characterized by having a melt flow of at least about 300 g/10 min and a xylene solubles of not more than about 3.5% and no peroxide residue. The catalyst system may also include an internal phthalate donor. The method of the invention allows the amount of external donors to be reduced, or even eliminated, without significant increases in xylene solubles.
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Barthel-Rosa Luis Paulo
Blackmon Kenneth Paul
Daumerie Michel M.
Malbari Shabbir Ahmedbhai
Rauscher David J.
Choi Ling-Sui
Fina Technology, Inc.
Krueger Tenley R.
Madan Mossman & Sriram
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