Polyester Resins

1. Saturated Polyester Resin

Polyester resins are a part of the polymer family containing ester functional groups in their backbone. They have a common presence of the industry in products such as Polyethylene Terephthalate (PET) and Polycarbonate (PC). Based on their chemical structure, the polyesters can be broadly classified into two main types which are
known as saturated and unsaturated polyesters. PET represents the typical structure of a saturated polyester resin. Saturated polyester resins are prepared by the esterification of polybasic acids and polyols with its characteristic property is excellent flexibility while it maintains high hardness. Saturated polyester resins have both liquid form (solvent based) or solid form. Solvent based liquid saturated polyester resins have applications in coatings used on metal sheets, can and coil coatings as well as automotive paints. They are also used in anti-corrosion coatings on iron and steel structures that have been coated with epoxy-based primers.
Characteristics of saturated polyester resins include;
- Versatility and weather resistance
- Excellent chemical resistance
- Prominent hardness and toughness
- Stain resistance
- Excellent color retention


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