Abstract 1. A COMPOSITE FILM COMPRISING (A) A BIAXIALLY DRAWN FILM OF A POLYAMIDE CONTAINING IN THE MOLECULE NOT LESS THAN 70% (MOL) OF THE REPEATING UNIT CONSISTING OF METAXYLYLENEDIAMINE OR ITS MIXTURE WITH PARAXYLYENEDIAMINE, WHEREIN THE PARAXYLYLENEDIAMINE CONTENT IS NOT MORE THAN 30% (MOL) ON THE BASIS OF THE TOTAL AMOUNT OF METHAXYLYLENEDIAMINE AND PARAXYLYLENEDIAMINE, AND AN A,W-ALIPHATIC DICARBOXYLIC ACID HAVING 6 TO 10 CARBON ATOMS AND (B) A LAYER OF A THERMOPLASTIC RESIN HAVING A MELTING POINT OR A SOFTENING POINT AT LEAST 50*C. BELOW THE MELTING POINT OR THE SOFTENING POINT OF THE POLYAMIDE PROVIDED ON AT LEAST ONE SURFACE OF THE BIAXIALLY DRAWN FILM; THE BIAXIALLY DRAWN FILM HAVING THE FOLLOWING PHYSICAL CONSTANTS: (7) YIELD ELONGATION: 2 TO 6% IN MACHINE AND TRANSVERSE DIRECTION; AND THE COMPOSITE FILM HAVING THE FOLLOWING PHYSICAL CONSTANT; (8) GAS TRANSMISSION RATE (AT 30*C.): NOT MORE THAN 50 ML./M.2 24 HR. ATM.
A COMPOSITE FILM COMPRISING (A) A BIAXIALLY DRAWN FILM OF A POLYAMIDE CONTAINING IN THE MOLECULE NOT LESS THAN 70% (MOL) OF THE REPEATING UNIT CONSISTING OF METAXYLYLENEDIAMINE OR ITS MIXTURE WITH PARAXYLYENEDIAMINE, WHEREIN THE PARAXYLYLENEDIAMINE CONTENT IS NOT MORE THAN 30% (MOL) ON THE BASIS OF THE TOTAL AMOUNT OF METHAXYLYLENEDIAMINE AND PARAXYLYLENEDIAMINE, AND AN A,W-ALIPHATIC DICARBOXYLIC ACID HAVING 6 TO 10 CARBON ATOMS AND (B) A LAYER OF A THERMOPLASTIC RESIN HAVING A MELTING POINT OR A SOFTENING POINT AT LEAST 50*C. BELOW THE MELTING POINT OR THE SOFTENING POINT OF THE POLYAMIDE PROVIDED ON AT LEAST ONE SURFACE OF THE BIAXIALLY DRAWN FILM; THE BIAXIALLY DRAWN FILM HAVING THE FOLLOWING PHYSICAL CONSTANTS: (7) YIELD ELONGATION: 2 TO 6% IN MACHINE AND TRANSVERSE DIRECTION; AND THE COMPOSITE FILM HAVING THE FOLLOWING PHYSICAL CONSTANT; (8) GAS TRANSMISSION RATE (AT 30*C.): NOT MORE THAN 50 ML./M.2 24 HR. ATM.
Claim 2
Dependent Claim
149 words
A COMPOSITE FILM COMPRISING (A) A BIAXIALLY DRAWN FILM OF A POLYAMIDE CONTAINING IN THE MOLECULE NOT LESS THAN 70% (MOL) OF THE REPEATING UNIT CONSISTING OF METAXYLYLENEDIAMINE OR ITS MIXTURE WITH PARAXYLYENEDIAMINE, WHEREIN THE PARAXYLYLENEDIAMINE CONTENT IS NOT MORE THAN 30% (MOL) ON THE BASIS OF THE TOTAL AMOUNT OF METHAXYLYLENEDIAMINE AND PARAXYLYLENEDIAMINE, AND AN A,W-ALIPHATIC DICARBOXYLIC ACID HAVING 6 TO 10 CARBON ATOMS AND (B) A LAYER OF A THERMOPLASTIC RESIN HAVING A MELTING POINT OR A SOFTENING POINT AT LEAST 50*C. BELOW THE MELTING POINT OR THE SOFTENING POINT OF THE POLYAMIDE PROVIDED ON AT LEAST ONE SURFACE OF THE BIAXIALLY DRAWN FILM; THE BIAXIALLY DRAWN FILM HAVING THE FOLLOWING PHYSICAL CONSTANTS: (7) YIELD ELONGATION: 2 TO 6% IN MACHINE AND TRANSVERSE DIRECTION; AND THE COMPOSITE FILM HAVING THE FOLLOWING PHYSICAL CONSTANT; (8) GAS TRANSMISSION RATE (AT 30*C.): NOT MORE THAN 50 ML./M.2 24 HR. ATM.