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Polyethylene with controlled swelling.

U.S. Patent 8,609,792 (December 17, 2013), "Bimodal Polyethylene for Blow-Moulding Applications," Aurelien Vantomme, Daniel Siraux, Alain Van Sinoy, and Jean-Leon Gielens (Total Research 8< Technology Feluy, Seneffe (Feluy), Belgium).

Polyethylene is a popular resin for many applications, but problems remain. Certain applications, such as blow-molding, require careful balance of flow properties. A property that is especially important for blow-molding is extrudate swell. When a resin has too-little swell, it can become difficult to fill out intricate molds, such as the handles of blow-molded bottles.

Vantomme et al. developed biomodal polyethylenes with a controlled swell using two slurry loop reactors connected to each other. This reactor chain produces a bimodal resin with a molecular weight distribution of 7.0, a melt index of 1 to 100 g/10 min., and a density from 0.935 to 0.960 g/[cm.sup.3], with the proper extrudate swell.
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Author:Corneliussen, Roger
Publication:Plastics Engineering
Article Type:Brief article
Geographic Code:1USA
Date:Mar 1, 2014
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