초록 ▼

Coinjection stretch blow molded containers containing thermoplastic polyester resin and an EVOH resin are obtained, which have greatly improved impact delamination resistance. The containers comprise a thermoplastic polyester layer (layer a) and an ethylene-vinyl alcohol copolymer layer (layer b), w

Coinjection stretch blow molded containers containing thermoplastic polyester resin and an EVOH resin are obtained, which have greatly improved impact delamination resistance. The containers comprise 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 surf aces of the layer b, wherein the ethylene-vinyl alcohol copolymer satisfies the following formulae (1) and (2) and its differential scanning calorimetry (DSC) gives a single peak f or crystal fusion: 25.ltoreq.ETb.ltoreq.48 (1) 92.ltoreq.SDb.ltoreq.99 (2) wherein ETb indicates the ethylene content (mol %) of the ethylene-vinyl alcohol copolymer, and SDb indicates the degree of saponification (%) of the ethylene-vinyl alcohol copolymer.

대표청구항 ▼

1. 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/

1. 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.ltoreq.ETb1.ltoreq.48 (6) 99.ltoreq.SDb1 (7) 25.ltoreq.ETb2.ltoreq.48 (8) 92.ltoreq.SDb2.ltoreq.98 (9) `ETb2-ETb1`.ltoreq.8 (10) 1.ltoreq.(SDb1-SDb2).ltoreq.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).