| 摘要 |
PROBLEM TO BE SOLVED: To provide a polyester sheet excellent in flexibility, transparency and mechanical characteristics and not detereorating in transparency in particular with time. SOLUTION: The polyester sheet has a haze value of 3 or lower at a thickness of 200μm and comprises a polyester block copolymer consisting of units of specified carboxylic acid monomers (A) and units of specified glycol monomers (B), wherein the total of the content of dibasic acid units other than terephthalic acid units in the units of carboxylic acid monomers (A) and the content of diacidic base units other than ethylene glycol units in the units of glycol monomers (B) is at least 20 mol%, which contains tribasic or higher carboxylic acid units and/or trihydric or higher alcohol units in the specified proportions, and which has an intrinsic viscosityηof 0.6-1.2 dl/g, a glass transition temperature Tg of 0-30 deg.C and a heat quantity of crystal fusionΔHc of 0-10 J/g.
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