Multilayer container

Details Multilayer container Multilayer container

B - Operations, Transporting

32

B

B32B 27/28 (2006.01) B29C 49/00 (2006.01) B29C 67/24 (2006.01) B32B 27/34 (2006.01) B32B 27/36 (2006.01) B65D 1/00 (2006.01) B65D 1/02 (2006.01) C08J 5/00 (2006.01)

Patent

CA 2466451

The multilayer container of the present invention comprises an outermost layer, an innermost layer and at least one intermediate layer interposed between the outermost layer and the innermost layer. Each of the outermost and innermost layers is mainly made of a thermoplastic polyester resin A produced by polymerizing a dicarboxylic acid component comprising 80 mol% or higher of terephthalic acid with a diol component comprising 80 mol% or higher of ethylene glycol. At least one of the intermediate layers is mainly made of a mixed resin B of a polyamide resin C and a polyamide resin D in a mixing ratio of 99.5/0.5 to 80/20 by weight. The polyamide resin C is produced by polymerizing a diamine component comprising 70 mol% or higher of m-xylylenediamine with a dicarboxylic acid component comprising 70 mol% or higher of adipic acid. The polyamide resin D has a solubility index satisfying the formula (1): Sa < Sd < Sc (1) wherein each of Sa, Sb and Sd is a solubility index, calculated by Small method, of thermoplastic polyester resin A, the polyamide resin C and the polyamide resin D. The polyamide resin D has a glass transition temperature of 130°C or lower which is higher than that of the polyamide resin C. The multilayer container is excellent in gas-barrier property and resistant to delamination even when its shape includes indented and bending portions, allowing a broad design latitude.

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