Polyols and polyacids undergo a polycondensation reaction, and the resulting polymer backbone contains a large number of ester groups (-COO-), which are called polyesters. In the coating industry, polyester resins modified with fatty acids or oils are called alkyd resins, and polyesters containing unsaturated double bonds in the macromolecular chain are called unsaturated polyesters. Alkyd resin is a category of polyester resin. It refers to a polyester resin prepared by polycondensation reaction with polyol and polyacid modified by fatty acid (or vegetable oil). The molecular structure is based on polyol ester as the main chain, With fatty acid ester as side chain.
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