POLYESTER SHEET

PROBLEM TO BE SOLVED: To obtain a sheet exhibiting excellent transparency and flexibility by forming a polyester resin comprising a carboxylic acid monomer unit containing an aromatic dicarboxylic acid and a polybasic carboxylic acid each in a specific amount and a glycol monomer unit containing a polyalkylene glycol and a polyhydric alcohol each in a specific amount. SOLUTION: There is provided a sheet comprising a polyester resin containing a carboxylic acid monomer unit comprising 80-100 mole % of an aromatic dicarboxylic acid such as terephthalic acid or the like and 0.05-2 mole % of a polybasic carboxylic acid having a functionality of at least three such as trimellitic acid or the like and a glycol monomer unit comprising 0.5-15 mole % of a polyalkylene glycol from ethylene glycol or the like, having a number average mol.wt. of 500-3,000, and 0.05-2 mole % of a polyhydric alcohol having a functionality of at least three such as glycerol or the like. It has an intrinsic viscosity of 0.8-1.2 dl/g and a glass transition temperature of 20-50 deg.C. A polyester sheet having a thickness of 0.1-5 mm formed after compounding necessary additives has a haze value at a thickness of 2 mm of not more than 2.