Patent ID: 6686121
Filing Date: 2004-02-03
Classification: C08F,C08L,C09D,G03F,Y10S

Abstract:
A method for forming an image on a substrate, said method comprising:a) providing a photoresist composition that is made comprising the steps of: (I) providing a solution of a resist material made by a process comprising reacting (i) at least one alkali-soluble polymer having a phenolic hydroxyl or carboxyl group with (ii) at least one vinyl ether compound and/or (iii) at least one dialkyl dicarbonate in the presence of a catalyst in an aprotic solvent suitable as a resist coating solvent in which these materials can be dissolved; wherein step (I) consists of a process that does not isolate or purify the reaction product of (i) and (ii) and/or (iii); (II) thereafter, adding at least one photoacid generator to the solution of the resist material in step (I), to form the resist composition; b) thereafter, coating a suitable substrate with the photoresist composition from step a); c) thereafter, pre-baking the coated substrate; exposing the coated substrate to radiation; and developing with an alkaline developer to form a resist image, whereby a pattern having a line and space resolution of 0.20 &mgr;m or less can be obtained.