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US 6,582,828 B1Granted
Deep-drawn slidable foil based on polyolefins and polyamide
AssigneeWolff Walsrode AG
InventorGregor Kaschel
Life of this patent
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Abstract
A thermoformable, puncture-resistant multi-layered film with surface slip, prepared by coextrusion and built up from polyolefin-based, polyamide-based and adhesion promoting polymer layers and its use for packaging sharp-edged goods, in particular foodstuffs.
Claims17
A multi-layered film prepared by coextrusion, with a structure comprising
- a) a first outer layer consisting of:
- (1) one or more polyolefins or olefin copolymers or a mixture of these polymers;
- (2) lubricants;
- and
- (3) antiblocking agents,
- b) a second outer layer consisting of:
- (1) one or more polyolefins or olefin copolymers or a mixture of these polymers;
- (2) lubricants;
- and
- (3) antiblocking agents,
- wherein the melting point of the second outer layer is lower than that of the first outer layer,
- c) a first inner layer containing an adhesion-promoting polymer or an adhesion-promoting polymer mixture based on polyolefins or olefin copolymers or a mixture of these polymers, which is situated between the first outer layer and the second inner layer,
- d) a second inner layer containing a polyamide or a mixture of several polyamides, which is situated between the first inner layer and the third inner layer,
- e) a third inner layer containing an adhesion-promoting polymer or an adhesion-promoting polymer mixture based on polyolefins or olefin copolymers or a mixture of these polymers, which is situated between the second inner layer and the fourth inner layer,
- f) a fourth inner layer containing a polyolefin or olefin copolymer or a mixture of these polymers, which is situated between the third inner layer and the second outer layer.
12 more elements
Dependencies are inferred from the claim text.