A copolyester is a copolymer synthesized by modification of polyesters, which are combinations of diacids and diols.
For example, by introducing other diacids, such as isophthalic acid (IPA), or other diols, such as cyclohexane dimethanol (CHDM) to the polyester polyethylene terephthalate (PET), the material becomes a copolyester due to its comonomer content.
[1] Copolyesters retain their strength, clarity, and other mechanical properties even when exposed to a variety of chemicals that typically affect other materials, such as polycarbonates.
Copolyesters offer versatility to meet a wide variety of applications.
[1] Copolyester resins have proved to be effective in packaging applications, due to their toughness, versatility and chemical resistance.