Selected methylol-substituted trihydroxybenzophenones and their use in phenolic resin compositions
AssigneeOCG Microelectronic Materials, Inc.
InventorMedhat A. Toukhy
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Abstract
A methylol-substituted trihydroxybenzophenone of the formula (I): ##STR1## This methylol-substituted trihydroxybenzophenone may be reacted with selected phenolic monomers during or after the formation of a phenolic novolak resin thereby said resin having at least one unit of formula (II): ##STR2## wherein R and R.sub.1 are individually selected from hydrogen, a lower alkyl group having 1 to 4 carbon atoms or a lower alkoxy group having 1 to 4 carbon atoms.
Claims3
A phenolic novolak resin composition comprising the condensation reaction of precursors comprising para-creson, meta-creson, formaldehyde, and a methylol-substituted trihydroxybenzophenone having formula (I):
- ##STR9## and said phenolic novolak binder resin containing units of formula (II):
- ##STR10## wherein the starting mole ratio of meta-cresol to para-cresol is from about 70:30 to about 30:70;
- wherein the starting mole ratio of said methylol-substituted trihydroxybenzophenone to the other phenolic precursors is from 0.1:99.9 to 20:80;
- and wherein said resin has from about 0.1% to about 30% by moles of the units of formula (II).
Dependencies are inferred from the claim text.