Geo-Membrane Applications
The resent invention discloses geo-membrane applications having good processability, high stress crack resistance, good tensile properties and high impact toughness prepared with a bimodal medium density polyethylene resin.
1 . Geo-membrane applications produced by flat sheet extrusion or by blown sheet extrusion with a bimodal resin consisting of medium density polyethylene (MDPE) having a density of from 0.925 to 0.945 g/cm 3 .
2 . The geo-membranes applications of claim 1 wherein the MDPE resin is prepared by chemical blending with a single metallocene catalyst system in a double loop reactor.
3 . The geo-membranes applications of claim 2 wherein the metallocene catalyst system is based on a bis-indenyl catalyst component.
4 . The geo-membranes applications of claim 3 wherein the bis-indenyl catalyst component is a bis-tetrahydro-indenyl catalyst component.
5 . Use of a bimodal resin consisting of a medium density polyethylene having high molecular weight, a density of from 0925 to 0.945 g/cm 3 , high level of short chain branching and optimised distribution of short chain branches to prepare geo-membrane applications.
6 . The use of claim 5 wherein the bimodal MDPE is prepared by physical blending.
7 . The use of claim 5 wherein the bimodal MDPE is prepared by chemical blending.