Patent ID: 6613844
Filing Date: 2003-09-02
Classification: C08F,G03F,Y10S

Abstract:
A chemically amplified positive resist composition comprising(A) an organic solvent, (B) a base resin in the form of a styrene polymer represented by the following general formula (1), terminated with P, and having a weight average molecular weight of 1,000-500,000, wherein R is hydroxyl or OR3 groups, at least one of R groups being hydroxyl, R1 is hydrogen or methyl, R2 is a normal, branched or cyclic alkyl group of 1-30 carbon atoms, R3 is an acid labile group, letter x is 0 or a positive integer, y is a positive integer, satisfying x+y&lE;5, k is 0 or a positive integer, m is 0 or a positive integer, n is a positive integer, satisfying k+m+n&lE;5, p and q are positive numbers satisfying 03 groups may be the same or different when n is at least 2, &Dgr;&lE;is such a number that the polymer may have a weight average molecular weight of 1,000-500,000, P is hydrogen, normal, branched or cyclic alkyl or alkenyl groups of 1-30 carbon atoms, aromatic hydrocarbon groups of 6-50 carbon atoms, carboxyl, hydroxyl, or groups of the following general formula (2), (3) or (4), all the terminal groups are not hydrogen at the same time, wherein R4 is (r+1)-valence aliphatic hydrocarbon groups or alicyclic saturated hydrocarbon groups of 1-30 carbon atoms, or an aromatic hydrocarbon groups of 6-50 carbon atoms, R5 is normal, branched or cyclic alkyl groups of 1-30 carbon atoms, aromatic hydrocarbon groups of 6-50 carbon atoms, alkoxy groups of 1-30 carbon atoms, or hydroxyl, R5a is normal, branched or cyclic alkyl groups of 1-30 carbon atoms or aromatic hydrocarbon groups of 6-50 carbon atoms, letter h is 0 or 1, and letter r is a positive integer of 1-3,wherein the polymer of formula (1) may be crosslinked within a molecule and/or between molecules with a crosslinking group having a Câ€”Oâ€”C linkage resulting from reaction of at least one of the phenolic hydroxyl groups represented by R in formula (1), the hydroxyl groups represented by R5 in formula (2), and the hydroxyl groups in formula (3) with an alkenyl ether compound or halogenated alkyl ether compound, and the amount of the acid labile group and the crosslinking group combined is on the average from more than 0 mol %-80 mol % of the entirety of hydrogen atoms in the phenolic hydroxyl groups in formula (1), the hydroxyl groups represented by R5 in formula (2), and the hydroxyl groups in formula (3), (C) a photoacid generator, and (D) another base resin in the form of a polymer comprising recurring units of the following general formula (9), some of the hydrogen atoms of phenolic hydroxyl groups therein being replaced by acid labile groups of at least one type in an average proportion of 0 mol %-80 mol % of the entirety, said polymer having a weight average molecular weight of 3,000-300,000, wherein R1, R2, R9, R10, and R11 are as defined above, R12 is an acid labile group different from the â€”CR9R10OR11, e and f are 0 or positive numbers, g is a positive number, satisfying e+f+g=1, 0&lE;e/(e+f+g)&lE;0.5, and 0.4&lE;g/(e+f+g)&lE;0.9, wherein the polymer of formula (9) may be crosslinked within a molecule and/or between molecules with crosslinking groups having Câ€”Oâ€”C linkages resulting from reaction of phenolic hydroxyl groups therein with an alkenyl ether compound or halogenated alkyl ether compound, and the amount of the acid labile group and the crosslinking group combined is on the average from more than 0 mol %-80 mol % of the entirety of hydrogen atoms in the phenolic hydroxyl groups in formula (9) wherein e=0, f=0 and g=1.