Coinjection stretch blow molded container

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≦PC/(PA+PB+PC)≦0.3 (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≦ETb1≦48 (6)
• 99≦SDb1 (7)
• 25≦ETb2≦48 (8)
• 92≦SDb2≦99 (9)
• |ETb2−ETb1|≦8 (10)
• 1≦(SDb1−SDb2)≦8 (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).