Basic Classification of Polyester Resins-Jiangsu Baiside New Materials Co., Ltd. — a manufacturer specializing in polyester resins for thermosetting powder coatings.

Basic Classification of Polyester Resins

Release Date:

2021-12-06

By using different polybasic acids and polyols, it is possible to synthesize saturated polyester resins of various types and with distinct properties. If only linear diols and dicarboxylic acids are employed, the resulting resin contains exclusively linear chains; if the polybasic acids include aromatic rings—such as phthalic anhydride, terephthalic acid, or trimellitic anhydride—the product will feature aromatic ring structures. Furthermore, when additional components are introduced via chemical reactions beyond polyols and polybasic acids, the resulting resin is classified as a modified polyester. When synthesizing polyester resins with linear polyols and polybasic acids, the resulting polymer exhibits a linear architecture and excellent flexibility, making it suitable primarily for certain applications.

By using different polybasic acids and polyols, it is possible to synthesize saturated polyester resins of various types and with distinct properties. If only linear diols and dicarboxylic acids are employed, the resulting polyester resin will contain exclusively linear chains. When the polybasic acids include aromatic rings—such as phthalic anhydride, terephthalic acid, or trimellitic anhydride—the resulting polyester resin will incorporate aromatic ring structures. Furthermore, if additional components are introduced via chemical reactions in addition to the polyols and polybasic acids, the product is a modified polyester resin.

When linear polyols and polycarboxylic acids are used to synthesize polyester resins, the resulting polymers exhibit a linear structure and excellent flexibility; their primary applications, however, lie outside the coatings industry. Nylon, which we encounter in everyday life and at work, is a quintessential example of a linear polyester. A typical linear polyester, nylon‑66, is produced from hexamethylenediamine and adipic acid; structurally speaking, it can also be synthesized from 1,6‑hexanediol and adipic acid.

When synthetic polyester resins are prepared by reacting polybasic acids containing benzene rings with polyols, the resulting resin incorporates a benzene-ring structure. The rigidity of the benzene ring imparts hardness to the resin, while its stable structural characteristics confer chemical resistance.

Saturated polyester resin

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Saturated polyester resin

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