Composite sheet having improved adhesive properties and methods of making same
AssigneeImperial Chemical Industries PLC
InventorsThane Colin Gough, Pamela Moira Jeffels, Anthony Garry Harrison
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Abstract
A composite sheet has a substrate layer, a coating layer and a flexible adhesive layer. The substrate layer is preferably a polyester film. The coating layer contains a layer mineral. The flexible adherent layer has a percentage elongation to break of greater that 150%. The composite sheet exhibits oxygen barrier properties and is suitable for use as a packaging film, particularly when laminated to a heat-sealable layer.
Claims20
A composite sheet comprising a substrate layer having on at least one surface thereof a coating layer comprising a layer mineral, the remote surface of said coating layer having thereon a flexible adherent layer having a percentage elongation to break of greater than 150% and a tensile modulus (1% secant modulus) of less than 2.0 MPa.
A method of producing a composite sheet by forming a substrate layer, applying to at least one surface thereof a coating layer comprising a layer mineral, and applying to the remote surface of said coating layer a flexible adherent layer having a percentage elongation to break of greater than 150% and a tensile modulus (1% secant modulus) of less than 2.0 MPa.
Dependencies are inferred from the claim text.