| 摘要 |
<p>PURPOSE:To obtain a heat-resistant vessel provided with retort sterilizability and gas barrier property, by a method wherein an ethylene-vinyl alcohol copolymer (EVOH) layer, containing drying agent, is provided with a crystallized polyester resin (PET) layer on at least one surface thereof. CONSTITUTION:The principal constituent of crystallized PET is polyester, containing 80mol.% or more of ethylene terephthalate unit, and crystallization promoter such as polyolefin or the like is blended therewith. The ethylene unit of EVOH is preferably 25-60mo.% or more, and the degree of saponification of vinyl acetate unit is preferably 96% or higher. Drying agent is preferably hydrate forming salt, and especially phosphate. The drying agent is required that it is dispersed finely into the matrix, and the volume area average diameter of particles having major diameter 10mu or more is 30mu or less while high gas permeability is obtained by the fine dispersion. The ratio of EVOH to drying agent is preferably 97:3-50:50 in weight ratio. Thermoplastic polyester adhesive resin is preferably employed for the bonding of PET and EVOH.</p> |
