Resin purification process

Details Resin purification process Resin purification process

1996-09-06

1998-08-04

Truong, Duc

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

Synthetic resins

From phenol, phenol ether, or inorganic phenolate

528491, 528499, 528501, 427352, 4273855, 430113, 430117, 430135, 524501, 524594, C08G 804

Patent

active

057895228

ABSTRACT:
The invention is directed to purification of phenolic resins and to a process for preparing an organic photoresist coating composition. The process comprises reacting one or more phenols to form a crude phenolic resin. The crude phenolic resin formed is then separated from its reaction mixture and dissolved in an aqueous insoluble organic solvent in an organic solvent that is a solvent for the photoresist coating composition. The solution so formed is then mixed with an aqueous phase to extract water soluble impurities from the resin solution into the aqueous phase. Finally, the purified resin solution is further diluted with additional photoresist solvent.

REFERENCES:
patent: 5216111 (1993-06-01), Zampini
Kirk Othmar Encyclopedia of Chemical Technology, 3rd Edition, vol. 17, pp. 384-413, 1982.

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