HIGH PRESSURE LOW DENSITY POLYETHYLENE RESINS WITH IMPROVED OPTICAL PROPERTIES PRODUCED THROUGH USE OF HIGHLY ACTIVE CHAIN TRANSFER AGENTS

摘要

Disclosed is an ethylene-based polymer with a density from about 0.90 to about 0.94 in grams per cubic centimeter, with a molecular weight distribution (M_w/M_n) from about 2 to about 30, a melt index (I₂) from about 0.1 to about 50 grams per 10 minutes, and further comprising sulfur from about 5 to about 4000 parts per million. The amount of sulfur is also determined based upon the total weight of the ethylene-based polymer. Also disclosed is process for making an ethylene-based polymer which includes the steps of splitting a process fluid for delivery into a tubular reactor; feeding an upstream process feed stream into a first reaction zone and at least one downstream process feed stream into at least one other reaction zone, where the process fluid has an average velocity of at least 10 meters per second; and initiating a free-radical polymerization reaction.