High-molecular weight unsaturated polyester resin.

摘要

An unsaturated alkyd having a number-average molecular weight of at least 5000 obtained by esterification and then deglycolization reaction of (a) at least 10 mol% of an alpha , beta -unsaturated polybasic acid or an anhydride thereof relative to 100 mol% of the total polybasic acid including any saturated or non- alpha , beta -unsaturated polybasic acid (or anhydride thereof) and (b) at least 50 mol% of a polyhydroxy alcohol having a boiling point of 300 DEG C or less at 760 mmHg relative to 100 mol% of the total polyhydroxy alcohol summed up with another polyhydroxy alcohol not defined above. The polyester resin can be widely used in a various applications by employing the excellent physical properties thereof.