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US 4,069,934 AGranted
Container with improved heat-shrunk cellular sleeve
AssigneeOwens-Illinois, Inc.
InventorJames A. Karabedian
Life of this patent
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AssigneeOwens-Illinois, Inc.
InventorJames A. Karabedian
Estimating the term…
There is disclosed herein improved packages, and methods of forming same, of the type wherein a container, such as for example a glass container, like a bottle or jar, is provided externally thereof with a heat-shrunk, cellular thermoplastic member, circumferentially and snugly engaging a sidewall portion of the container; the improvement resides in employing, as the thermoplastic member, a composite structure, or laminate, of a closed cellular polymeric layer preponderantly of polystyrene having incorporated therein from zero weight percent up to compatible amounts of a copolymer of ethylene and an alkyl ester of alpha-beta monoethylenically unsaturated carboxylic acid or a copolymer of ethylene and vinyl acetate or a copolymer of ethylene and an alpha-beta monoethylenically unsaturated carboxylic acid, or mixtures thereof, and, in adhered relationship to said cellular layer, a layer of a noncellular polymeric material preponderantly of ethylene moieties having incorporated therein moieties of vinyl acetate, or an alkyl ester of alpha-beta monoethylenically unsaturated carboxylic acid, or an alpha-beta monoethylenically unsaturated carboxylic acid, or mixtures thereof.
In an article of manufacture comprising a container having a sidewall and further including a polymeric sleeve disposed circumferentially outwardly of said sidewall and in snug heat shrunk engagement therewith, the improvement wherein said polymeric sleeve is a composite structure of a closed cellular polymeric layer preponderantly of polystyrene having incorporated therein, in an amount from zero weight percent up to compatible amounts, a copolymer of ethylene and vinyl acetate, or a copolymer of ethylene and an alkyl ester of an alpha-beta monethylenically unsaturated carboxylic acid, or a copolymer of ethylene and an alpha-beta monoethylenically unsaturated carboxylic acid, or mixtures thereof, and a noncellular polymeric layer having preponderantly ethylene moieties and incorporated therein moieties of vinyl acetate or an alkyl ester of an alpha-beta monoethylenically unsaturated carboxylic acid, or an alpha-beta monoethylenically unsaturated carboxylic acid, or a mixtures thereof, the amount of said incorporated moieties in said non-cellular layer being sufficient to promote the adhesion of said layers, said non-cellular layer being disposed outwardly of said cellular layer and in adhering engagement therewith.
A heat shrinkable, sleeve-shaped article of composite construction having a first layer of a heat-shrinkable, closed cellular polymeric material consisting essentially of preponderantly polystyrene and, from zero weight percent up to compatible amounts, of a member selected from the group consisting of a copolymer of ethylene and vinyl acetate, a copolymer of ethylene and an alkyl ester of an alpha-beta monoethylenically unsaturated carboxylic acid, a copolymer of ethylene and an alpha-beta monoethylenically unsaturated carboxylic acid, and mixtures thereof, and a second layer in adhered engagement to said first layer, said second layer being a non-cellular polymeric material consisting essentially of preponderantly ethylene moieties and moieties of a member selected from the group consisting of vinyl acetate, an alkyl ester of an alpha-beta monoethylenically unsaturated carboxylic acid, an alpha-beta monoethylenically unsaturated carboxylic acid, and mixtures thereof, the amount of said moieties being sufficient to promote the adhesion of said respective layers, said noncellular layer being disposed outwardly of said cellular layer and in adhering engagement therewith said sleeve having a greater heat shrinkage in the radial direction thereof than in the axial direction thereof.
Dependencies are inferred from the claim text.