Patent ID: 7479364

Claim:
A process for generating a patterned structure on a surface, comprising the steps of: (a) generating a resist image on a substrate using a photoresist composition comprised of a copolymer synthesized from a first monomer having the structure of formula (I) wherein R 1 is H, F, CN, CH 3 , CF 3 , CF 2 H, or CFH 2 ; R 2a and R 2b are independently H or F; and R 3 is CN or COOR, wherein R is selected from the group consisting of H, C 1-12 alkyl and C 1-12 fluoroalkyl, or is selected so as to render R 3 acid-cleavable, with the proviso that when R 3 is CN, then R 1 is CF 3 and R 2a and R 2b are H; and a second monomer having the structure of formula (II) wherein R 4 is H, C 1-12 alkyl, or C 3-15 alicyclic, R 5 is C 1-12 alkyl, C 1-12 alkyl substituted with 1-12 fluorine atoms and 0-2 hydroxyl groups, or C 3-15 alicyclic, or R 4 and R 5 together form a five-, six-, or seven-membered ring, R 6 is H, C 1-12 alkyl, or C 1-12 fluoroalkyl, or R 4 and R 6 together form a five-, six-, or seven-membered ring, R 7 is H, C 1-12 alkyl, or C 1-12 fluoroalkyl, or R 7 and R 5 together represent —X—(CR 8 R 9 ) n —, in which case R 4 and R 6 are H, X is O or CH 2 , n is 1 or 2, R 8 and R 9 are H, C 1-12 alkyl, or C 1-12 fluoroalkyl, or together form an oxo moiety (═O), with the proviso that when R 8 and R 9 together form ═O, n is 1; (b) transferring the resist image to the underlying substrate.