Patent ID: 7615272
Filing Date: 2009-11-10
Classification: B29B,B29C,B32B,B65D,Y10T

Abstract:
1. A coinjection stretch blow molded container comprising: a layer of thermoplastic polyester (A), and a layer of an ethylene-vinyl alcohol copolymer resin composition (B); wherein the layer of thermoplastic polyester (A) has an intrinsic viscosity of from 0.70 to 0.90 dl/g and a cyclic trimer content of at most 0.50% by weight of the overall weight of the layer of thermoplastic polyester (A); wherein the layer of an ethylene-vinyl alcohol copolymer resin composition (B) comprises an ethylene-vinyl alcohol copolymer (b1) having an ethylene content of from 20 to 60 mol % and a degree of saponification of at least 90 mol %, acetic acid (b2), a phosphoric compound (b3) and a boron compound (b4), wherein: the content ratio of acetic acid (b2) to the ethylene-vinyl alcohol copolymer (b1) is from 30 to 250 ppm, the content ratio of the phosphoric compound (b3) to the ethylene-vinyl alcohol copolymer (b1) is from 5 to 500 ppm in terms of the phosphoric radical, the content ratio of the boron compound (b4) to the ethylene-vinyl alcohol copolymer (b1) is from 20 to 2000 ppm in terms of the boron element, wherein the layer of an ethylene-vinyl alcohol copolymer resin composition (B) further comprises an alkali metal salt (b5), wherein the content ratio of the alkali metal salt (b5) to the ethylene-vinyl alcohol copolymer (b1) is at most 300 ppm in terms of the alkali metal and further comprises an alkaline earth metal salt (b6), and wherein the content ratio of the alkaline earth metal salt (b6) to the ethylene-vinyl alcohol copolymer (b1) is at most 10 ppm in terms of the alkaline earth metal, the melt index at 190° C., 2160 g loaded, of the layer of an ethylene-vinyl alcohol copolymer resin composition (B) is from 0.1 to 10 g/10 mm; and wherein the thickness ratio of the layer of thermoplastic polyester (A) to the layer of an ethylene-vinyl alcohol copolymer resin composition (B) in the body of the container is from 90/10 to 99/1.