Servicio de Información Comunitario sobre Investigación y Desarrollo - CORDIS

Improved polymer blends for postponing extrusion defects

Linear polyethylenes exhibiting processing instabilities were modified by blending. Various combinations of low and/or high molecular weight linear polyethylene fractions were added to the main polymer. A small-scale processing study involving a capillary rheometer enabled estimating the dependence of onset and severity of various extrudate distortions on molecular weight. It was shown that various combinations lead to higher onset rates, whereas others lead to lower onset rates. Several promising candidate blends were produced in larger quantity. Blown films were made under different conditions. It was concluded that blending enables postponing the occurrence of the instabilitites to higher production rates. In general, the final mechanical properties of the film will be worse than for the base material. However, the effect is small enough to make this a viable route for various applications.

Reported by

Dow Benelux B.V.
P.O. Box 48
4530 AA Terneuzen
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