Photophysics and photoreactivity of substituted thioxanthones
摘要:
The photophysics and the interaction of the excited states of
substituted thioxanthones have been studied in order to be able to
predict their behaviour as photoinitiators in photopolymerization
systems. Electron-donor groups in position 2 in the thioxanthone ring
lead to high fluorescence quantum yields, red-shifts in the emission
spectra and long singlet lifetimes, explained by the separation of the
nπ* and ππ* excited states induced by the higher electron
density of the aromatic system. For some of the derivatives a
biexponential decay due to slow relaxation of the solvent has been
observed. Rate constants for the quenching of the singlet state by
amines are near the diffusional limit and are not modified by
substituents. On the other hand, substitution of electron-donor groups
on the thioxanthone ring in position 2 decreases the triplet
reactivity towards amines and alkenes. The incorporation of double
bonds on the side chains of the compounds does not affect the
lifetimes and reactivity of the thioxanthones.
INK COMPOSITION, IMAGE FORMATION METHOD, AND PRINTED MATTER
申请人:FUJIFILM Corporation
公开号:EP2889340A1
公开(公告)日:2015-07-01
An ink composition includes a compound having two or more partial structures represented by the following Formula (A) in a molecule (Component a), a compound selected from the group consisting of a compound represented by the following Formula (B1) and a compound represented by the following Formula (B2) (Component b), and a color material (Component c).
INK COMPOSITION, IMAGE FORMING METHOD, AND PRINTED MATERIAL
申请人:HIRONAKA Koji
公开号:US20120213978A1
公开(公告)日:2012-08-23
Provided is an ink composition having excellent dischargeability during image recording by an inkjet method and having excellent water resistance, solvent resistance, and adhesiveness to a recording medium of the recorded image.
The ink composition includes a structure represented by the structural formula (A), a compound having at least any one of a residue formed by removing one hydrogen atom from a compound represented by the general formula (B1) and a residue formed by removing one hydrogen atom from a compound represented by the general formula (B2) in one molecule or plural molecules, and a coloring material.