Patent ID: 7261993
Filing Date: 2007-08-28
Classification: G03F,Y10S

Abstract:
1. A positive-working photoresist consisting essentially of; (A) a branched polymer containing protected acid groups, said polymer comprising one or more branch segment(s), the branch segment(s): a. containing greater than 50% of the protected acid groups present in the branched polymer; and b. being chemically linked along a linear backbone segment, wherein each branch segment: i. contains at least two repeating monomer units, ii. has a number average molecular weight (Mn) of at least 1000; and iii. is incorporated into the branched polymer as a macromer, said macromer being a polymer, copolymer or oligomer of molecular weight ranging from at least 1,000 to about 40,000 and containing a terminal ethylenically unsaturated polymerizable group, wherein the macromer is incorporated into the branched polymer by copolymerization of the terminal ethylenically unsaturated polymerizable group with en ethylenic group of the linear backbone segment; and (B) at least one photoacid generator.