To produce a polyester film excellent in adhesion and esp. suitable for metal cans by forming the film with a polyester including a specific quantity of neopentyl glycol and having a specific unit as a principal structural one.
This objective film (pref. biaxially-oriented film) is produced by constituting the film of a polyester including 1-40 mol.% (pref. 2-35 mol.%, more pref. 4-25 mol.%) and having ethylene terephthalate and/or ethylene naphthalate unit as principal structural one. The principal melting temperature, (i.e., melting peak temperature detected by 1st run in differential scanning calorimetry) of the film is pref. 150-265°C, more pref. 200-265°C, furthermore pref. 246-260°C. The film pref. includes particles having ≥1.1 shape factor D/d (defined by the ratio of the maximum length D of particles to the minimum length d) in a content of 0.01-0.5 wt.%.
MATSUI RYOSUKE
KIMURA MASAHIRO
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