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US 6,638,465 B1Granted
Process of manufacturing evoh/polyester bistretched film and the film thus obtained
AssigneeDuPont Teijin Films U.S. Limited Partnership
InventorsChristine Andreis-Olinger, Gusty Feyder
Life of this patent
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Abstract
A multilayer film is formed by coextruding and bistretching EVOH, binder and polyester followed by heat treating for less than 8 seconds at a temperature between 170° C. and 250° C.
Claims13
A process for manufacturing a multilayer film, comprising at least a layer of EVOH, a layer of a coextrusion binder, and a layer of polyester, comprising the steps of:
- (i) coextruding a layer of EVOH, a layer of a coextrusion binder and layer of polyester;
- (ii) simultaneously bistretching the layers of (i);
- and
- (iii) heat treating the layers of (ii) at a temperature between 170° C. and 250° C. and during a heat treatment time below 8 sec.
1 more element
Dependencies are inferred from the claim text.