| 摘要 |
<p>An ink curable with actinic energy rays which is characterized by containing a photocleavage type photopolymerization initiator (A) comprising a-aminoalkylphenone compound (A1) having a molar absorption coefficient as measured at a wavelength of 365 nm of 100 (l/mol·cm) or more and less than 100,000 (l/mol·cm) and/or an acylphosphine oxide compound (A2) having a molar absorption coefficient as measured at a wavelength of 365 nm of 100 (l/mol·cm) or more and less than 100,000 (l/mol·cm); and a hydrogen abstraction type photopolymerization initiator (B) comprising 4,4'-dialkylaminobenzophenone having a molar absorption coefficient at a wavelength of 365 nm of 10, 000 (l/mol·cm) or more and less than 1,000,000 (l/mol·cm) and by optionally containing a tertiary amine compound (C) having a molar extinction coefficient as measured at a wavelength of 365 nm of 1 (l/mol·cm) or lower. The ink curable with actinic energy rays further includes a resin, a pigment, and a compound having an acrylate group. When used with a light emitting ultraviolet rays especially having a luminescence-peak wavelength in the range of 350 to 420 nm as an ultraviolet irradiator, the ink has excellent curability and printability in both monocolor printing and overprinting, the ink further has excellent storage stability.</p> |
