Patent ID: 6395358
Filing Date: 2002-05-28
Classification: B29B,B29C,B29K,B32B,Y10T

Abstract:
A coinjection stretch blow molded container, comprising a thermoplastic polyester layer (layer a) and an ethylene-vinyl alcohol copolymer layer (layer b), with the (layer a) being kept in direct contact with the both surfaces of the (layer b), and having a configuration of the layers of one of a/b/a or a/b/a/b/a viewed in a cross-section of the container, wherein the ethylene-vinyl alcohol copolymer is a mixture of two ethylene-vinyl alcohol copolymers (b1, b2) in a ratio by weight, (B1, b2) falling between 10/90 and 90/10, and satisfies the following formulae (6) to (11) and its differential scanning calorimetry (DSC) gives a single peak for crystal fusion:25&lE;ETb1&lE;48â€ƒâ€ƒ(6) 99&lE;SDb1â€ƒâ€ƒ(7) 25&lE;ETb2&lE;48â€ƒâ€ƒ(8) â€ƒ92&lE;SDb2&lE;98â€ƒâ€ƒ(9)|ETb2âˆ’ETb1|&lE;8â€ƒâ€ƒ(10) 1&lE;(SDb1âˆ’SDb2)&lE;8â€ƒâ€ƒ(11) wherein:ETb1 represents the ethylene content (mol %) of the ethylene-vinyl alcohol copolymer (b1), SDb1 represents the degree of saponification (%) of the ethylene-vinyl alcohol copolymer (b1), ETb2 represents the ethylene content (mol %) of the ethylene-vinyl alcohol copolymer (b2), and SDb2 represents the degree of saponification (%) of the ethylene-vinyl alcohol copolymer (b2).