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Proceedings Paper

Solvents in novolak synthesis
Author(s): Chet J. Sobodacha; Thomas J. Lynch; Dana L. Durham; Valerie R. Paradis
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Paper Abstract

Novolac resins may be prepared with or without a solvent present. We have found that solvent power greatly affects the properties of the finished resin and thus gives the resist chemist another variable with which to `fine-tune' resist properties. Using designed experiments, we investigated the effect of solvent power, as measured by Hansen's Solubility Parameters, of a number of solvents and solvent mixtures on the final properties of the novolac resin. We found that the relative molecular weight (RMW) and dissolution rate of a novolac resin can be varied by selection of a solvent or solvent mixture with the appropriate polarity and hydrogen- bonding characteristics. The solvent polarity and hydrogen-bonding characteristics may affect the stability of the cresol/formaldehyde transition state, thus causing the observed changes in RMW and dissolution rate.

Paper Details

Date Published: 15 September 1993
PDF: 11 pages
Proc. SPIE 1925, Advances in Resist Technology and Processing X, (15 September 1993); doi: 10.1117/12.154793
Show Author Affiliations
Chet J. Sobodacha, Hoechst Celanese Corp. (United States)
Thomas J. Lynch, Hoechst Celanese Corp. (United States)
Dana L. Durham, Hoechst Celanese Corp. (United States)
Valerie R. Paradis, Hoechst Celanese Corp. (United States)


Published in SPIE Proceedings Vol. 1925:
Advances in Resist Technology and Processing X
William D. Hinsberg, Editor(s)

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