| 摘要 |
PROBLEM TO BE SOLVED: To highly keep a color tone by a method wherein the outermost layer of a film and at least other one film layer are made of a polyester, to specify the compounding amounts of virgin polyesters respectively including in the above-mentioned layers or the like and the color difference represented by the formula between the outermost layer of the film and the other one film layer is specified. SOLUTION: When the constitution of a film layer is, for example, layers consisting of two kinds and three layers or the outermost layer/a layer/the outermost layer, at least one outermost film layer is made of a polyester, the virgin polyester content in which is 90 wt.% or more and at least the other one film layer is made of a polyester, the regenerated polyester content obtained from a colored pigment polyester film in which is 10-70 wt.% and, at the same time, the virgin polyester content in which is 30-90 wt.%. Further, the color differenceΔE represented by the formula, in which Ls, as and bs represent the color tone of the outermost layer and Lm, am and bm represent the color tone of the other layer, is 5.0 or less, preferably 3.0 or less and especially preferably 2.0 or less.
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