| 摘要 |
Photoactivatable coating composition comprising (A) an activated unsaturated group-containing compound, (B) an activated CH group-containing compound such as an oligomeric or polymeric malonate compound and/or an acetoacetate group-containing compound, (C) a catalyst in the form of one or more Lewis or Brönstedt bases, with the conjugated acids of the latter having a pKa of at least 10, such as 1,8-diazabicyclo[5.4.0]undec-7-ene, and (D) a photoinitiator, wherein the photoinitiator is a photolatent base. Preference is given to a coating composition wherein the photolatent base is an alpha-aminoalkene of the structure wherein R16 is phenyl ; R17 and R18 are hydrogen or methyl; R19 and R21 together form a C3-alkylene bridge; R20 and R22 together form a C3-alkylene bridge; R31 and R32 are hydrogen. The composition may additionally comprise a sensitizer selected from the group of thioxanthones, oxazines, rhodamines, ketocoumarins, and preferably from the group of benzophenone and derivatives thereof. |
