| 摘要 |
PURPOSE:To produce a polyester film which is excellent in adhesive properties in printing ink and a metallic vapor-deposited film and resistance to moisture by melting oxyketone metallic complex compd. and mixing this complex compd. with polyester in vacuum and extruding this mixture. CONSTITUTION:The content of oxyketone metallic complex compd. is regulated to 0.01 - 3 wt.% for polyester resin. In the case less than this range, the adhesive properties to a metallic vapor-deposited layer expecially at high humidity and curing are not made remarkable. Further the case exceeding the above-mentioned range is made unpreferable because degree of polymerization is lowered at a time for heating and melting polyester or coloring is easily casued. In the case of mixing oxyketone metallic complex compd. with polyester, such a method is shown that for example, these are supplied to a vacuum vent-type biaxial extruder, heated and melted in vacuum and mixed with each other. At this time, degree of vacuum is preferably regulated to a range within 0.1 - 10 mmHg and heating temp. is preferably regulated to m.p. or more of polyester resin. Further oxyketone metallic complex compd. is melted on at least single side of a film made of polyethylene terephthalate and mixed therewith. A composite film can be formed by laminating a film made of this obtained polyester. |
