John A Donahue

US Patent:

20200325320, Oct 15, 2020

Filed:

Apr 27, 2018

Appl. No.:

16/613468

Inventors:

- Baytown TX, US
George J. Pehlert - Houston TX, US
Anthony Poloso - Marriottsville MD, US
Adrian G. Barry - Houston TX, US
John M. Donahue - Greenville SC, US

International Classification:

C08L 23/14
C08L 23/08
B29C 48/00

Abstract:

A polypropylene comprising within a range from 0.1 wt % to 4 wt % ethylene and/or C4 to C12 α-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.