| 摘要 |
This invention provides a process for preparing hydroxybenzoic acid polyester resins with a high degree of heat resistance and a high degree of polymerization, and is characterized in that: with the aid of intermediate transformation of phenol and by means of esterification, polyester can directly be obtained by polycondensation from the only starting material hydroxybenzoic acid. The transfer medium phenol existing in the distillates mixture can directly and repeatedly be used without any compensation. The product obtained in this invention is low cost, having a high degree of polymerization, 80-90% yield and in less than 1 hr, with 3% weight loss percentage at 400 DEG C. It can be used for various industrial and engineering purposes wherever heat-resistant, abrasion-resistant, self-lubricating, good heat conducting, dielectric, solvent and radiation resisting properties are required.
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