Exxonmobil Chemical Patents Inc.

John M Donahue

George James Pehlert

Anthony Poloso

Caitlin A Spofford

Lyn B Greenwood

Adrian G Barry

A polypropylene comprising within a range from 0.1 wt % to 4 wt % ethylene and/or C4 to C12 &#x3b1;-olefin derived units, one or more clarifiers, or both; wherein the polypropylene has a flexural modulus of at least 200 kpsi (0.05 in/min ASTM D790(A)) and an Mz/Mw of at least 4. The polypropylenes may be made by combining propylene and a comonomer with a Ziegler-Natta catalyst and at least two external electron donors, wherein the concentration of the electron donors is within a range from 1 to 100 ppm. The concentration of electron donors may be decreased to control the haze level of the polypropylene, and/or the level of comonomer derived units may be controlled to reduce the haze level of the polypropylene.

High melt strength polypropylene with high stiffness and clarity

The invention relates to a fiber comprising a polymer blend of (a) from about 90 to about 99 wt % of a propylene polymer and (b) from about 1 to about 10 wt % of a polymer blend modifier, comprising a first propylene-based polymer wherein the first propylene-based polymer is a homopolymer of propylene or a copolymer of propylene and ethylene or a Cto Calpha-olefin and a second propylene-based polymer wherein the second propylene-based polymer is a homopolymer of propylene or a copolymer of propylene and ethylene or a Cto Calpha-olefin, wherein the second propylene-based polymer is different than the first propylene-based polymer and wherein the polymer blend modifier has a MFR of greater than about 1,000 g/10 min to less than about 10,000 g/10 min; and wherein the propylene polymer has a MFR of less than about 15 g/10 min.

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Greenville, SC, United States of America

John M Donahue