BROAD MWD, COMPOSITIONALLY UNIFORM ETHYLENE INTERPOLYMER COMPOSITIONS, PROCESS FOR MAKING THE SAME AND ARTICLE MADE THEREFROM

摘要

The present invention pertains to a continuous process and polymerization system characterized by separate injection of catalyst and make-up feed, an ethylene interpolymer composition characterized as having broad molecular weight distribution (MWD) and optimized compositional uniformity, a process for making such a composition and a fabricated article made from such composition. The novel composition is characterized as having a melt flow ratio, I10/I2, from 8 to 10.4, a M w/M n of greater than 4 as determined by gel permeation chromatography, a melt index, I2, from 0.1 to 10 gram/10 minutes, a density less than 0.945 gram/cubic centimeter, and based on the total weight of crystallizable polymer portions, a weight percent at the dominant peak temperature above 75 .degree.C, as determined using crystallization analysis fractionation in the range of 20 to 100 .degree.C, equal to or greater than the mathematical product of 1.7946.times.10 -28 .times. 10?(31.839 .times. composition density)~ for composition density in grams/cubic centimeter. The novel composition exhibits good processibility and improved toughness properties, especially excellent film tear and impact resistance, and is particularly well-suited for use in applications such as high performance trash can liners and heavy dutyshipping bags.