Patent ID: 8771923

Claim:
A radiation-sensitive composition comprising: a low-molecular-weight compound having one or more acid-dissociable groups which decompose by an action of an acid to enhance solubility in an alkaline developing solution and one or more radiation-sensitive acid-generating groups which generate an acid upon application of an active ray or radiation per molecule, and having a polystyrene-reduced number-average molecular weight (Mn) measured by gel permeation chromatography (GPC) of 500 to 4,000, wherein the low-molecular-weight compound is not obtained from chain growth polymerization of a monomer with an unsaturated bond; a solvent; and a radiation-sensitive acid-generator other than the low-molecular-weight compound, wherein a content of the low-molecular-weight compound is 80 mass % or more of 100 mass % of a total solid component of the radiation-sensitive composition, and wherein the low-molecular-weight compound is a compound shown by a following formula (1), wherein A represents an aliphatic group having 1 to 50 carbon atoms, an aromatic group having 6 to 50 carbon atoms, an organic group consisting of said aliphatic and said aromatic group, or a group having a valence which is a sum of l+m+n and which has two or more of the aliphatic group represented by A, the aromatic group represented by A, or the organic group represented by A; X represents —O—, —CH 2 C(═O)—O—, —C(═O)—O—, —OC(O)O—, or —Ar 1 —O—, wherein Ar 1 represents a 1,4-phenylene group; R 1 represents an acid-dissociable group which is a substituted or unsubstituted tertiary hydrocarbon group having 4 to 12 carbon atoms or a substituted or unsubstituted acetal group; Y represents —CH 2 —C(═O)—O—R 2 —, wherein R 2 represents a substituted or unsubstituted methylene group or a substituted or unsubstituted alkylene group having 2 to 30 carbon atoms; l is an integer from 1 to 4; m is an integer from 1 to 3; n is an integer from 0 to 10; and Z is an organic group shown by a formula (2), a formula (3), a formula (4), or a formula (5) and, in a case where m is 2 or 3, the organic groups represented by Z are either a same or different, wherein M 1 + in the formula (2) represents a monovalent onium cation; M 2 + in the formula (3) represents a monovalent onium cation; R 3 in the formula (3) and the formula (5) represents a substituted or unsubstituted alkyl group having 1 to 15 carbon atoms or a substituted or unsubstituted aryl group having 1 to 15 carbon atoms; P in the formula (4) represents a substituted or unsubstituted alkylene group having 2 to 10 carbon atoms or a substituted or unsubstituted arylene group having 2 to 10 carbon atoms; and Q in the formula (5) represents a group shown by a formula (6), a formula (7), or a formula (8), wherein an amount of the radiation-sensitive acid generator is from 0.1 to 10 parts by mass for 100 parts by mass of the low-molecular-weight compound.