Patent ID: 6140026
Filing Date: 2000-10-31
Classification: C07C,C07D,G03F

Abstract:
A process of forming a positive patterned image on a substrate, comprising the steps of:(1) coating said substrate with a radiation sensitive mixture useful as a positive working photoresist, said mixture comprising an admixture of an alkali soluble binder resin and at least one photosensitive compound comprising at least one o-quinonediazide sulfonic acid ester of a phenol compound, said ester having formula (II): ##STR21## wherein R.sub.1, R.sub.2, R.sub.3, R.sub.4, R.sub.5, and R.sub.6 are each independently selected from the group consisting of H and a lower alkyl group having 1-4 carbon atoms;v and w are each an integer from 0 to 2 with the proviso that v and w cannot simultaneously be 0;each S and T are independently selected from the group consisting of oxygen and --CH.sub.2 --, with the proviso that S and T cannot simultaneously be --CH.sub.2 --;X is an integer from 1-4;R is a bivalent alkali-soluble moiety selected from the formulae (A'), (B'), (C'), (D'), and (E'): ##STR22## wherein R.sub.7, R.sub.8, and R.sub.9 are independently selected from the group consisting of hydrogen, lower alkyl groups having 1-4 carbon atoms, araalkyl and cycloalkyl; andOD is either hydrogen or an o-quinonediazide sulfonic acid ester group, subject to the proviso that not all Ds are hydrogen and at least about 75% of the hydroxyl groups on said phenolic rings having the cyclic ether moieties have been esterified with an o-quinonediazide sulfonic acid moiety, and less than about 25% of the hydroxyl groups on phenolic rings having no cyclic ether moieties have been esterified;wherein the amount of said photosensitive compound is from about 5% to about 40% by weight, based on the total solid content of said radiation sensitive mixture;(2) subjecting said coating on said substrate to an image-wise exposure of radiation; and(3) subjecting said image-wise exposed coated substrate to a developing solution wherein the exposed area of said radiation-exposed coatings are dissolved and removed from the substrate, thereby resulting in positive image-wise pattern in the coating.