Patent ID: 7166411

Claim:
A photosensitive composition comprising: (a) an infrared absorbing agent represented by the following formula (I); and (b) a polymer compound which is insoluble in water and soluble in an aqueous alkali solution, wherein; the solubility of the photosensitive composition in an aqueous alkali solution is changed by radiation of an infrared laser; wherein X 1 and X 2 independently represent —CR 7 R 8 —,—S—, —Se—, —NR 9 —, —CH═CH— or —O—R 1 and R 2 independently represent an alkyl group having 9to 30 carbon atoms, R 3 , R 4 , R 5 and R 6 independently represent a hydrogen atom or an alkyl group having 1 to 10 carbon atoms and may represent a plurality of atoms required for R 3 and R 4 or R 5 and R 6 to be combined with each other to form an aliphatic 5- or 6-membered ring, an aromatic 6-membered ring, an aromatic 10-membered ring, a substituted aromatic 6-membered ring or a substituted aromatic 10-membered ring, R 7 and R 8 independently represent an alkyl group having 1 to 18 carbon atoms or an aryl group having 6 to 18 carbon atoms, R 9 represents an alkyl group having 1 to 18 carbon atoms oran aryl group having 6 to 18 carbon atoms, Z represents a heptamethine group which may have a substituent wherein the substituent is an alkyl group having 8 or less carbon atoms, a halogen atom or an amino group and the heptamethine group may include a cyclohexene ring or a cyclopentene ring which is formed by combining substituents on two methine carbons with each other and which may have a substituent where the substituent on the ring structure is selected from an alkyl group having 6 or less carbon atoms or a halogen atom and Q represents a counter ion.