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US 5,330,696 AGranted
Process of making laminar articles of a polyolefin and a nylon/polyvinyl alcohol blend
AssigneeE. I. Du Pont de Nemours and Company
InventorVinod K. Mehra
Life of this patent
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Abstract
A laminar article with good barrier properties to oxygenated and hydrocarbon compounds is prepared by blending a polyolefin with about 2 to 39% of a melt blend of a nylon and a polyvinyl alcohol component, using an alkylcarboxyl-substituted polyolefin as a compatibilizer.
Claims10
A process for preparing a laminar article of polymeric material, comprising the steps of:
- (a) selecting a polyamide and a polyvinyl alcohol component, to function as a barrier in said laminar article;
- (b) preparing a melted blend of said polyamide and said polyvinyl alcohol component;
- (c) combining about 2 to about 39 percent by weight of the melted blend with about 60 to about 97 percent by weight of a polyolefin and about 0.25 to about 12 percent by weight of an alkylcarboxyl-substituted polyolefin at a sufficient temperature to melt all the components, thereby forming a melted heterogeneous mixture;
- (d) forming the melted heterogeneous mixture by (i) stretching a body of the mixture and (ii) cooling the stretched body to below the melting point of the lowest melting polymer component
- whereby the blend of (b) is present in a polyolefin matrix as a multitude of thin, substantially two-dimensional, parallel, and overlapping layers.
2 more elements
A process for preparing a laminar article of polymeric material, comprising the steps of:
- (a) selecting a polyamide and a polyvinyl alcohol component, to function as a barrier in said laminar article;
- (b) preparing a melted blend of said polyamide and said polyvinyl alcohol component;
- (c) pelletizing the blend of polyamide and polyvinyl alcohol component to form pellets having dimensions of about 1 to about 5 mm;
- (d) combining about 2 to about 39 percent by weight of said pelletized blend with particles of about 60 to about 97 percent by weight of a polyolefin and about 0.25 to about 12 percent by weight of an alkylcarboxyl-substituted polyolefin;
- (e) heating said combination at a sufficient temperature to melt all the components, thereby forming a melted heterogeneous mixture;
- and
- (f) forming the melted heterogeneous mixture by (i) stretching a body of the mixture and (ii) cooling the stretched body to below the melting point of the lowest melting polymer component
- whereby the blend of (b) is present in a polyolefin matrix as a multitude of thin, substantially two-dimensional, parallel, and overlapping layers.
5 more elements
Dependencies are inferred from the claim text.