Polymer films
AssigneeIRPLAST S.p.A.
InventorsCarmelo DI COSTANZO, Angelo MONTAGANO, Michael PIERSE, Roberto TROILO
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Abstract
Multi-layer polyolefin films for envelope windows, comprising at least three layers wherein the central layer comprises a propylene homopolymer; the layer of film on the outer part of the envelope, which forms the anti-reflective layer, is based on propylene copolymers in mixture with HDPE, HDPE being comprised between 40 and 50% by weight of the mixture; the inner layer in contact with the contents of the envelope is based on ethylene/propylene/butene copolymers, the film being isotropic in relation to shear strength.
Claims15
A multi-layer polyolefin film for an envelope window, comprising at least three layers, the at least three layers including an inner layer, a central layer, and an outer layer, wherein the central layer comprises a propylene homopolymer;
- the outer layer comprises a layer of film on the outer part of the envelope and is based on propylene copolymers in mixture with HDPE, HDPE comprising between 40 and 50% by weight of the mixture;
- and the inner layer is in contact with the contents of the envelope and is based on propylene copolymers, and wherein the multi-layer polyolefin film is isotropic in relation to shear strength.
Dependencies are inferred from the claim text.