| 摘要 |
PURPOSE:The title film excellent in solvent resistance and bondability, obtained by applying a specified hydrophilic self-crosslinking polyurethane composition to at least either of the surfaces of a polyester film and curing this by heating. CONSTITUTION:A hydrophilic self-crosslinking polyurethane composition is obtained by reacting a polyol of a MW of 200-20,000, containing a compound having at least three hydroxyl groups in the molecule with a polyisocyanate compound at 60 deg.C or below for 5min-1hr. An aqueous coating solution obtained by dissolving 30wt.% this composition in water is applied to at least either of the surfaces of a non-oriented polyester film at a coating weight of 0.5-20 g/m<2>, dried, stretched and heat-treated to effect curing of the polyurethane composition and the crystallization of the polyester by orientation.
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