| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a polyester resin for producing a blow molded article having excellent heat stability and transparency, without causing whitening by draw down or crystallization during blow molding, with good productivity, the polyester resin further having excellent recyclability so that an edge material of the polyester resin once generated during blow molding can be molded favorably when used for blow molding again.SOLUTION: There is provided a polyester resin where 70 mol% or more of an acid component constituting polyester is terephthalic acid, 60 to 98 mol% of a glycol component is ethylene glycol and 2 to 20 mol% is an ethylene oxide added body of bisphenol A, intrinsic viscosity is 0.7 to 1.4, a ratio between a weight average molecular weight and a number average molecular weight (weight average molecular weight/number average molecular weight) is 1.9 to 2.5 and the carboxyl terminal group concentration is 20 equivalent/t or less. There is also provided a polyester resin having the content of a cyclic trimer of 0.6 mass% or less.</p> |
