B - Operations – Transporting – 65 – D
Patent
B - Operations, Transporting
65
D
B65D 1/40 (2006.01) B29C 49/00 (2006.01) B29C 49/22 (2006.01) B32B 27/30 (2006.01) B32B 27/36 (2006.01) B65D 65/40 (2006.01)
Patent
CA 2330274
Multi-layered, coinjection stretch blow molded containers are obtained by stretch-blow molding a preform prepared by coinjection-molding a polyester resin and an EVOH resin mixture. Even though not having an adhesive resin layer, the containers have good impact delamination resistance and good gas-barrier properties. Their transparency is high, and the resin melts for them are stable. The containers comprise thermoplastic polyester layers (layers a) and a resin composition layer (layer b) of a mixture of two ethylene-vinyl alcohol copolymers (b1, b2) with the layers a being kept in direct contact with the both surfaces of the layer b, wherein the dispersion morphology of the resin composition is such that the particles of the ethylene-vinyl alcohol copolymer (b2) having an ethylene content of from 35 to 48 mol% and a degree of saponification of from 92 to 99 % are dispersed in the matrix of the ethylene-vinyl alcohol copolymer (b1) having an ethylene content of from 25 to 40 mol% and a degree of saponification of at least 99 %, the resin composition gives at least two peaks for crystal fusion in its differential scanning calorimetry (DSC), the difference between b1 and b2 in the ethylene content falls between 8 and 23 mol%, the difference therebetween in the degree of saponification falls between 1 and 8 %, and the blend ratio of b1 to b2 falls between 60/40 and 90/10.
Shimo Hiroyuki
Tai Shinji
Kirby Eades Gale Baker
Kuraray Co. Ltd.
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