| abstract |
Oxime ester compounds represented by formulas (I) and (II) containing an unsaturated five-membered heteroaromatic ring structure, wherein m, n, n', A1, A2, R1, R2, R3, R4, R5, R6, R6', R7, and R7' are defined in the specification. The compounds represented by the formulas (I) and (II) have excellent light absorption at 350-450 nm, can initiate the polymerization of acrylate-based monomers at low concentration, and have excellent thermal stability in the acrylate monomers, are oxime ester photoinitiators good in stability and suitable for an ultraviolet-visible LED light source. The present invention further provides preparation of the compounds represented by the formulas (I) and (II) and use of the compounds represented by the formulas (I) and (II) as photoinitiators or photosensitizers. |