Method for manufacturing thermotropic liquid-crystalline...

Details Method for manufacturing thermotropic liquid-crystalline... Method for manufacturing thermotropic liquid-crystalline...

2006-08-08

2006-08-08

Acquah, Samuel A. (Department: 1711)

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

Synthetic resins

From phenol, phenol ether, or inorganic phenolate

C528S180000, C528S193000, C528S194000, C528S207000, C528S212000, C528S219000, C524S740000, C524S742000

Reexamination Certificate

active

07087704

ABSTRACT:
It is an object of the present invention to manufacture high quality thermotropic liquid-crystalline polymer generating no low boiling gas and inducing no discoloration resulted from thermal degradation at high yield. To manufacture a liquid-crystalline polymer having 50 mol % or larger ratio of constitutive unit introduced from 4-hydroxybenzoic acid, the reaction is conducted under the presence of an acylating agent and of a catalyst quantity of aromatic sulfonic acid.

REFERENCES:
patent: 6716367 (2004-04-01), Kanaka et al.
patent: 6956072 (2005-10-01), Kanaka et al.
patent: 02153922 (1990-06-01), None
patent: 2002363281 (2002-12-01), None

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