Patent ID: 8715918
Filing Date: 2014-05-06
Classification: G03F

Abstract:
1. A method for forming a photoresist relief image on a substrate comprising: (a) applying on a substrate a layer of the photoresist composition comprising a resin binder comprising an acid labile group where the resin binder is a reaction product formed in the absence of a catalyst between (i) a novolak polymer, (ii) a polymer comprising substituted or unsubstituted hydroxystyrene and acrylate, methacrylate or a mixture of acrylate and methacrylate, the acrylate and/or methacrylate being protected by an acid labile group that requires a high activation energy for deblocking, and (iii) a compound selected from a group consisting of vinyl ether and an unsubstituted or substituted heteroalicyclic, further where the components (i-iii) are reacted together at between 80° C. to 140° C., and (b) exposing the photoresist layer to activating radiation and developing the exposed photoresist layer wherein the layer is applied in a film of thickness in the range of 2 microns to 200 microns on a substrate and provide images with aspect ratios greater than 3.