Laminar articles with good hydrocarbon barrier
AssigneeE. I. Du Pont de Nemours and Company
InventorsDavid D Zhang, Elizabeth R Griffin
Life of this patent
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Abstract
Disclosed is a laminar shaped article comprising a heterogeneous blend of (a) a composition comprising a vinyl halide or vinylidene halide polymer and optionally an ethylene copolymer containing carboxyl and/or carbon monoxide moieties, and (b) a polyolefin functionalized with a comonomer selected from the group consisting of maleic anhydride, maleic acid diesters, maleic acid monoesters, itaconic anhydride, itaconic acid diesters, itaconic acid monoesters, fumaric acid diesters, fumaric acid monoesters, or combinations thereof as a compatibilizer; and (c) a polyamide wherein the polyamide is present in the vinyl halide or vinylidene halide polymer as a multitude of overlapping layers.
Claims20
A process comprising combining a halide polymer composition, a polyamide incompatible with the halide polymer, and a compatibilizer to produce a mixture;
- heating the mixture to above the melting point of the highest melting resin in the mixture to produce a heterogeneous melt blend;
- stretching the melt blend up to five fold in at least one direction to produce a stretched body;
- and cooling the stretched body to below the melting point of the lowest melting resin in the mixture to produce an article wherein
- the article is a laminar shaped article;
- the halide polymer composition optionally comprises an ethylene copolymer;
- the halide polymer is polyvinylchloride homopolymer, polyvinylchloride copolymer, or combinations of two or more thereof;
- the polyamide is present as a multitude of thin, substantially two dimensional, parallel, and overlapping layers embedded in a continuous phase of the halide polymer composition;
- and
- the compatibilizer is a functionalized polyolefin;
- and
- combining the article with a substrate, which adheres to, or is in contact with, the article, wherein the substrate is cellular foam, fabric, or fiberglass;
- and the fabric is woven fabric or non-woven fabric.
Dependencies are inferred from the claim text.