Patent ID: 6165675
Filing Date: 2000-12-26
Classification: C08G,C08L,G03F

Abstract:
A process for producing a positive photoresist composition comprising:a) producing a water insoluble, aqueous alkali soluble novolak resin by condensing one ore more methyl phenols and an aldehyde, in the presence of an acid catalyst, in a suitable reaction solvent, distilling said novolak resin utilizing sub surface forced steam distillation, at a temperature of 100.degree. C. to 160.degree. C. and thereby isolating said novolak resin;b) providing an admixture of:1) a photosensitive component in an amount sufficient to uniformly photosensitize the photoresist composition; and2) the water insoluble, aqueous alkali soluble novolak resin from step a);3) a suitable solvent.