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Ethylene /Propylene (EP) Copolymer Materials

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Patents with Abstracts

Polypropylene ethylene-propylene copolymer blends and in-line process to produce them
Kiss et al of ExxonMobil, New Jersey, developed an in-line process for producing isotactic polypropylene /ethylene-propylene copolymer blends consisting of 1 to 50 wt % of isotactic polypropylene with a melt flow rate of between 0.5 and 20,000 g/10 min and a melting peak temperature of C. or higher, and wherein the difference between the DSC peak melting and the peak crystallization temperatures is less than or equal to 0.5333 times the melting peak temperature minus C., and 50 to 99 wt% ethylene-propylene copolymer including between 10 wt % and 20 wt % randomly distributed ethylene with a melt flow rate of between 0.5 and 20,000 g/10 min, wherein the copolymer is polymerized by a bulk homogeneous polymerization process, and wherein the total regio defects in the continuous propylene segments of the copolymer is between 40 and 150% greater than a copolymer of equivalent melt flow rate and wt % ethylene polymerized by a solution polymerization process. (RDC 5/16/2012)

Supertransparent high impact strength random block copolymer
Pezzutti  et al of Lummus Novolen Technology, Germany, developed a high impact strength random block copolymer including (a) 65-97 wt% of a crystalline propylene/ethylene copolymer A containing from 0.5 to 6 wt% derived from ethylene and from 94 to 99.5 wt% derived from propylene, and (b) 3-35 wt% propylene/ethylene copolymer B containing from 8 to 40 wt% ethylene and 60 to 92 wt% propylene. The crystalline to amorphous ratio Lc/La of the random block copolymer is1.00 to 2.25. The random block copolymer is characterized by both high toughness and low haze. (RDC 5/16/2012)


Roger D. Corneliussen

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Copyright 2012 by Roger D. Corneliussen.
No part of this transmission is to be duplicated in any manner or forwarded by electronic mail without the express written permission of Roger D. Corneliussen

** Date of latest addition; date of first entry is 5/16/2012.