Multilayered coextruded geomembrane

Abstract

A multilayered coextruded geomembrane system utilized in a variety of applications including, but not limited to, landfills for the disposal of wastes, surface impoundments or ponds, heap leach pads for mining or methane barriers for building and floating covers reservoirs. The geomembrane consists of three or more polymeric layers with outside layers consisting of high density polyethylene at least 0.930 g/cm.sup.3 and a very low density polyethylene inner core layer less than or equal to 0.920 g/cm.sup.3. The melt index of the very low and high density polyethylene is less than 2.0 and 1.0, respectively. Each outside layer of high density polyethylene is 10 to 40% of the total geomembrane thickness. The very low density polyethylene inner core layer is 20 to 80% of the total geomembrane thickness.

Dependencies are inferred from the claim text.