Light-sensitive o-quinone diazide composition and product with phenolic novolak prepared by condensation with haloacetoaldehyde

摘要

A phenolic novolak resin comprising the product of a condensation reaction of an aldehyde comprising a haloacetaldehyde source or a mixture of a haloacetaldehyde source and a formaldehyde source with a phenolic monomer comprising at least one compound of the formula: <IMAGE> wherein R1, R2 and R3 are individually selected from hydrogen or a one to four carbon alkyl group and wherein the ratio of total carbon atoms in the sum of R1, R2 and R3 to the total number of phenolic nuclei in said resin is from about 0.5:1 to about 1.5:1 in the presence of a solvent; said resin made by employing a molar ratio of total aldehyde to total phenolic monomers from about 0.33:1 to about 0.70:1. These phenolic resins are suitable for use in light-sensitive compositions (e.g. positive-working photoresists).