Copolymerized polyester resin and preparation method thereof

Abstract

A copolymerized polyester resin and a preparation method thereof are disclosed. Particularly, the copolymerized polyester resin contains a repeating unit derived from a diol component; and a dicarboxylic acid or a repeating unit derived from a derivative component of a dicarboxylic acid. By controlling the contents of a first diol to a third diol included in the diol component, the copolymerized polyester resin does not have degraded transparency and mechanical properties and exhibits excellent heat resistance and hydrolysis resistance, and thus exhibits low haze degradation even in high-temperature and humid conditions. Therefore, the copolymerized polyester resin may be applied to various fields requiring high heat resistance, hydrolysis resistance, and mechanical properties, such as a packaging material such as food containers, a vehicle interior material and the like, to exhibit excellent properties.

Dependencies are inferred from the claim text.