| 摘要 |
A polyester resin composition containing an oxycarboxylic acid as a constituent unit, wherein an oxycarboxylic acid unit having five or less carbon atoms accounts for 2 to 75 mole % relative to 100 mole % of the total thereof, and the formula: 0.03 < SAA/SBB < 30 is satisfied where SAA represents the mole ratio of the oxycarboxylic acid unit having two oxycarboxylic acid units as both units adjacent thereto and SBB represents the mole ratio of the oxycarboxylic acid unit having one or no oxycarboxylic acid unit as the unit adjacent thereto. The polyester resin composition exhibits improved gas-barrier properties while retaining excellent mechanical properties and color, in particular, transparency and thermal resistance, comparable to those of a crystalline polyester.
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