Multilayer films having reduced curling
AssigneeEquistar Chemicals, LP
InventorJeffrey C. Haley
Life of this patent
Estimating the term…
Abstract
Disclosed is a multilayer film. The multilayer film has the general structure of A/B/A/C or B/A/B/C, wherein A is a nucleated high density polyethylene (HDPE) layer, B is a single or multilayer structure, and C is a seal layer. Adding a nucleating agent to HDPE improves the water vapor barrier property of the HDPE layer and the multilayer film, but it also causes the multilayer film to curl in the conventional multilayer film structures. The invention provides a multilayer film, which includes at least one layer of nucleated HDPE, with reduced or eliminated curling while retaining high water vapor barrier.
Claims17
A multilayer film having a general structure of A/B/NC or B/A/B/C, wherein A is a nucleated high density polyethylene (HDPE) layer, B is a single or multilayer structure, and C is a seal layer.
A method for reducing or eliminating the curling of a multilayer film having a general structure of A/B/C or B/NC, said method comprising adding a layer to the multilayer film to form a new film structure of A/B/A/C or B/A/B/C;
- wherein A is a nucleated high density polyethylene (HDPE) layer, B is a single or multilayer structure, and C is a seal layer.
Dependencies are inferred from the claim text.