| abstract |
Provided is a multi-layer structure comprising the following layers: a layer (A) consisting primarily of a polyethylene terephthalate resin, which comprises a dicarboxylic acid component that contains terephthalic acid and a diol component that consists primarily of ethylene glycol, wherein the copolymer fraction of non-terephthalic-acid dicarboxylic acids in the dicarboxylic acid component is 15-40 mol% of the entire dicarboxylic acid component; and a layer (B) that is adjacent to the abovementioned layer (A) and consists primarily of a polyvinyl alcohol resin having the structural unit represented by general formula (1). This results in increased interlayer adhesion between the layers (A and B), yielding a multi-layer structure that is highly resistant to separation of the layers thereof. (1) (In formula (1), R 1 , R 2 , and R 3 each independently represent a hydrogen atom or an organic group, and X represents a single bond or a bond chain. R 4 , R 5 , and R 6 each independently represent a hydrogen atom or an organic group.) |