Patent ID: 6720053
Filing Date: 2004-04-13
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 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 X-ray photoelectron spectroscopy (XPS) of the surface of the (layer b) as exposed by peeling the layers a and b of the body of the container at their interface gives a pattern that satisfies the following formula (3):0.015&lE;PC/(PA+PB+PC)&lE;0.3â€ƒâ€ƒ(3) wherein:PA represents the area of the highest peak (peak A) of the peaks for the binding energy of C1 electrons, PB represents the area of the peak (peak B) appearing in the side higher by from 1.1 to 1.8 eV than the position of the peak A, and PC represents the area of the peak (peak C) appearing in the side higher by from 3.6 to 4.3 eV than the position of the peak, and 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): 25&lE;ETb1&lE;48â€ƒâ€ƒ(6) 99&lE;SDb1â€ƒâ€ƒ(7) 25&lE;ETb2&lE;48â€ƒâ€ƒ(8) 92&lE;SDb2&lE;99â€ƒâ€ƒ(9) â€ƒ|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).