Process for preparing heat resisting hydrobenzoic acid series po

Details Process for preparing heat resisting hydrobenzoic acid series po Process for preparing heat resisting hydrobenzoic acid series po

1989-11-03

1991-04-09

Anderson, Harold D.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

From phenol, phenol ether, or inorganic phenolate

528176, 528179, 528207, C08G 6306, C08G 6538

Patent

active

050066323

ABSTRACT:
This invention provides a process for preparing hydroxybenzoic acid polyer 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.degree. 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.

REFERENCES:
patent: 4075173 (1978-02-01), Maruyama et al.
patent: 4661579 (1987-04-01), Blocker
patent: 4745167 (1988-05-01), Iizuka et al.
patent: 4746708 (1988-05-01), Sybert
patent: 4864013 (1989-09-01), Kageyama et al.
patent: 4910284 (1990-03-01), Hijikata et al.
patent: 4920197 (1990-04-01), Hayashi et al.

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