Abstract: An oxime ester compound represented by general formula (I): wherein R1, R2, and R3 each independently represent R11, OR11, COR11, SR11, CONR12R13, or CN; R11, R12, and R13 each independently represent a hydrogen atom, an alkyl group having 1 to 20 carbon atoms, an aryl group having 6 to 30 carbon atoms, an arylalkyl group having 7 to 30 carbon atoms, or a heterocyclic group having 2 to 20 carbon atoms, R4 and R5 each independently represent R11, OR11, SR11, COR11, CONR12R13, NR12COR11, OCOR11, COOR11, SCOR11, OCSR11, COSR11, CSOR11, CN, a halogen atom, or a hydroxyl group; and a and b each independently represent 0 to 3.

Abstract: An oxime ester compound represented by general formula (I): wherein R1, R2, and R3 each independently represent R11, OR11, COR11, SR11, CONR12R13, or CN; R11, R12, and R13 each independently represent a hydrogen atom, an alkyl group having 1 to 20 carbon atoms, an aryl group having 6 to 30 carbon atoms, an arylalkyl group having 7 to 30 carbon atoms, or a heterocyclic group having 2 to 20 carbon atoms, R4 and R5 each independently represent R11, OR11, SR11, COR11, CONR12R13, NR12COR11, OCOR11, COOR11, SCOR11, OCSR11, COSR11, CSOR11, CN, a halogen atom, or a hydroxyl group; and a and b each independently represent 0 to 3.

Abstract: An oxime ester compound represented below is useful as a photopolymerization initiator. A photopolymerization initiator including this as an active constituent has high sensitivity and causes no concern about coloration or contamination. (X represents a halogen atom or alkyl group. R1, R2, and R3 each independently represent R, OR, COR, SR, CONRR?, or CN, wherein R and R? each represent an alkyl group, an aryl group, an aralkyl group, or a heterocyclic group; these groups may be substituted with (a) halogen atom(s) and/or (a) heterocyclic group(s); the alkylene moiety in the alkyl or aralkyl group may be interrupted by (an) unsaturated bond(s), (an) ether bond(s), (a) thioether bond(s), or (an) ester bond(s); and R and R? may form a ring. Y1 represents an oxygen, sulfur, or selenium atom; A represents a heterocyclic group; m represents an integer 0-4; p represents an integer 0-5; and q represents 0 or 1.

Abstract: Disclosed is an oxime ester compound represented by the following general formula (I). (In the formula, R1, R2 and R3 independently represent R11, OR11, COR11, SR11, CONR12R13 or CN; R11, R12 and R13 Independently represent a hydrogen atom, an alkyl group having 1-20 carbon atoms, an aryl group having 6-30 carbon atoms, an arylalkyl group having 7-30 carbon atoms or a heterocyclic group having 2-20 carbon atoms; R4 and R5 independently represent R11, OR11, SR11, COR11, CONR12R13, NR12COR11, OCOR11, COOR11, SCOR11, OCSR11, COSR11, CSOR11, CN, a halogen atom or a hydroxy group; and a and b independently represent a number of 0-3.

Abstract: An oxime ester compound represented below is useful as a photopolymerization initiator. A photopolymerization initiator including this as an active constituent has high sensitivity and causes no concern about coloration or contamination. (X represents a halogen atom or alkyl group. R1, R2, and R3 each independently represent R, OR, COR, SR, CONRR?, or CN, wherein R and R? each represent an alkyl group, an aryl group, an aralkyl group, or a heterocyclic group; these groups may be substituted with (a) halogen atom(s) and/or (a) heterocyclic group(s); the alkylene moiety in the alkyl or aralkyl group may be interrupted by (an) unsaturated bond(s), (an) ether bond(s), (a) thioether bond(s), or (an) ester bond(s); and R and R? may form a ring. Y1 represents an oxygen, sulfur, or selenium atom; A represents a heterocyclic group; m represents an integer 0-4; p represents an integer 0-5; and q represents 0 or 1.