| 摘要 |
<p>PURPOSE:To improve the aging change in thickness and picking height of an EVOH layer in a multi-layered structure molded by a multi cavity mold, by setting a specific relation between two kinds of EVOH (saponified substance of ethylene-vinyl acetate copolymer) which constitute an intermediate layer of said multi-layered structure and have respectively restricted containing am ount of ethylene, saponification degree of vinyl acetate components and melt index(MI). CONSTITUTION:The present container consists of an inner and an outer layers formed of thermoplastic polyester and an intermediate layer formed of a com pound composed of at least two kinds of saponified substances of ethylene-vinyl acetate copolymer. This intermediate layer formed of two kinds a EVOH contains 20-60mol% of ethylene, with the saponification degree of components of vinyl acetate of not smaller than 90% and the melt index of 0.1-100g/10min. Supposing that the EVOH having a higher MI is saponified substance (A) of ethylene-vinyl acetate copolymer and the other EVOH having a lower MI is a saponified substance (B) of ethylene-vinyl acetate copolymer, the compound should be constituted such that equations (I)-(IV) are satisfied and moreover, the mixing ratio (weight) (A)/(B) is 95/5-5/95.</p> |
