| 摘要 |
PROBLEM TO BE SOLVED: To provide a degradable plastic film that has good adhesion to a printing ink and prevents the blocking which occurs when it is processed and whose transparency can be positively held by forming a coating film layer comprising a mixture of a thermoplastic polyester resin and a cellulose derivative on a surface of the film. SOLUTION: A mixing ratio (wt.%) of a polyester resin to a cellulose derivative is preferably 50:50-80:20. As a polyester resin, a thermoplastic saturated polyester resin produced by polycondensation of a dicarboxylic acid component and a diol component is preferable and especially, copolymerized polyester resin produced by copolycondensation thereof is more preferable but it is not necessarily limited to these resins. As a cellulose derivative, a nitrocellulose, an acetyl cellulose, a methyl cellulose, an ethyl cellulose or a mixture thereof can be used and among them a nitrocellulose is particularly preferable. The coating film layer is preferably as thin as possible, taking the environmental load at the time of its degradation into consideration and the film thickness of the coating film layer is preferably in a range of 0.1-5μm.
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