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US 6,306,503 B1Granted
Multilayer fluoropolymer films with improved adhesion
AssigneeAlliedSignal Inc.
InventorMingliang Lawrence Tsai
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AssigneeAlliedSignal Inc.
InventorMingliang Lawrence Tsai
Estimating the term…
Multilayer fluoropolymer films are formed from a layer of a fluoropolymer, a tie layer and a thermoplastic layer. The tie layer is a blend of an olefin-containing polymer, preferably at least one polyolefin having at least one functional moiety, such as an unsaturated carboxylic acid or anhydride thereof, and a styrene-containing polymer. Preferably, the fluoropolymer is a chlorotrifluoroethylene homopolymer or copolymer and the thermoplastic layer is a polyethylene. The preferred styrene-containing polymer is a styrene-ethylene-butylene-styrene block copolymer. These films exhibit increased adhesion between the layers as compared to a multilayer structure in which the tie layer is formed only from the olefin-containing polymer. The multilayer films are useful in packaging applications, including pharmaceutical packaging.
A multilayer film which comprises at least one fluoropolymer layer selected from the group consisting of chlorotrifluoro ethylene homopolymers, chlorotrifluoro ethylene-containing copolymers and blends thereof, and at least one thermoplastic layer comprising at least one thermoplastic homopolymer or copolymer, attached to a surface of the fluoropolymer layer by an intermediate adhesive layer, said intermediate adhesive layer comprising a blend of (1) an olefin-containing polymer selected from the group consisting of at least one functionalized polyolefin;
A pharmaceutical packaging material which comprises a multilayer film which comprises at least one fluoropolymer layer selected from the group consisting of chlorotrifluoro ethylene homopolymers, chlorotrifluoro ethylene-containing copolymers and blends thereof, and at least one thermoplastic layer comprising at least one thermoplastic homopolymer or copolymer, attached to a surface of the fluoropolymer layer by an intermediate adhesive layer, said intermediate adhesive layer comprising a blend of (1) an olefin-containing polymer selected from the group consisting of at least one functionalized polyolefin;
Dependencies are inferred from the claim text.