Propylene homopolymers and methods of making the same
AssigneeExxon Mobil Chemical Patents Inc.
InventorsChon-Yie Lin, Michael Chia-Chao Chen, Aspy Keki Mehta, Rajan K. Chudgar
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Abstract
This invention relates to isotactic propylene homopolymer compositions obtained from metallocene catalysis wherein the polymer has a molecular weight distribution (Mw/Mn) in the range of from about 2.5 to about 20.0. The isototic propylene homopolymer composition may be prepared in a multiple stage polymerization process using the same metallocene component in at least two stages.
Claims13
A propylene polymer composition comprising:
- isotactic propylene homopolymer with a molecular weight distribution in the range from 10 to about 20.0 and hexane extractables of less than 1.0 weight percent, wherein a 50.8 mm×50.8 mm×0.508 mm film formed from the propylene polymer composition exhibits an even stretch between the temperature ranges of from 151.7° C. to 157.2° C. when stretched to a final stretched thickness of about 19 μm after preheating the film for 27 sec and stretching the film at a rate of 76.2 mm/sec.
A propylene polymer composition comprising an isotactic propylene homopolymer having a hexane extractables of less than 2.0 weight percent, and a molecular weight distribution in the range from 10 to 20.0, wherein a film formed from the propylene polymer composition can be stretched in the temperature range of from greater than 148.9° C. without breaking when stretched to a final thickness of from 2 to 100 μm.
Dependencies are inferred from the claim text.