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US 5,399,396 AGranted
Multi-layer film
AssigneeExxon Chemical Patents Inc.
InventorsStefan B. Ohlsson, Philippe De Cambourg, Willy J. J. Leysen
Life of this patent
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Abstract
Multi-layered films are disclosed which have a barrier layer and at least one seal layer. The seal layer is made with a copolymer of ethylene and ethylenically unsaturated ester. The seal layer is radio frequency (RF) sealable and the seal layer has an anti-block matted surface. The matted seal layer surface permits a lower slip and anti-block additive level which improves RF sealing and heat sealing.
Claims17
A multi-layer film comprising:
- (a) a barrier layer, said barrier layer selected from the group consisting of polyethylene, a composite layer of a polyethylene and a polyamide and a composite layer of a polyethylene and an EVOH;
- and
- (b) a seal layer, said seal layer being an ethylene copolymer, having in the range of from about 5 to about 12 mol percent of a comonomer selected from the group consisting of vinyl acetate, ethyl acrylate, methyl acrylate and butyl acrylate;
- wherein said multi-layer film is RF weldable in the range of from about 10 to about 50 MHz to form a non-peelable seal and wherein said seal layer has an anti-block matted surface.
1 more element
A film comprising:
- (a) a barrier layer, said barrier layer selected from the group consisting of:
- (i) a linear polyethylene having a density of from about 0.90 to about 0.96 g/cc,
- (ii) a composite layer of a polyethylene layer and a polyamide layer, and
- (iii) a composite layer of a polyethylene layer and an EVOH layer;
- and
- (b) a seal layer comprising a copolymer of ethylene and an ethylenically unsaturated ester, said ester being selected from the group consisting of vinyl acetate and methyl acrylate, said ester being present in said seal layer in the range of from about 20 to about 25 weight percent based on the total weight of the ethylene copolymer;
- wherein said film is RF weldable in the range of from about 10 to about 50 MHz to form a non-peelable seal and said seal layer has an anti-block matted surface.
4 more elements
Dependencies are inferred from the claim text.