| 摘要 |
PROBLEM TO BE SOLVED: To enhance gas barrier properties by monolithically laminating a film layer made up of a polytrimethylene 2,6-naphthalate polyester and biaxially orientating the film on one face of a film layer consisting of a polyethylene terephthalate polyester. SOLUTION: A film layer formed of a polytrimethylene 2, 6-naphthalate polyester which is composed mainly of naphthalene 2,6-dicarboxylic acid as a main acid component, or composed mainly of a copolymerized dicarboxylic acid other than the naphthalene 2,6-dicarboxylic acid using naphthalene 2,7- dicarboxylic acid, naphthalene 1,4-dicarboxylic acid, terephthalic acid and ester derivatives thereof, is monolithically laminated and biaxially orientated on one face of a film layer comprising a polyethylene terephthalate polyester composed mainly of the terephthalic acid as a main acid component and ethylene glycol as a main glycol component.
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