申请人:EASTMAN KODAK COMPANY
(a New Jersey corporation)
公开号:EP0331413A1
公开(公告)日:1989-09-06
Sulfonium and oxysulfonium salts, useful as photoinitiators, are disclosed which have directly attached to the sulfur atom thereof:
at least one aromatic or heterocyclic aromatic substituent containing at least 14 aromatic atoms and having a removable positive hydrogen ion, said substituent exhibiting a higher energy occupied molecular orbital than at least one other substituent directly attached to said sulfur atom;
and at least one substituent comprising an electron withdrawing group and exhibiting a lower energy unoccupied molecular orbital than at least one other substituent directly attached to said sulfur atoms;
said salts being capable, upon exposure to visible radiation, of undergoing irreversible intramolecular rearrangement to form a Bronsted acid comprising the anion of said salt and said removable positive hydrogen ion.
本发明公开了可用作光引发剂的锍盐和氧锍盐,它们的硫原子上直接连接有
至少一个芳香族或杂环芳香族取代基,包含至少 14 个芳香族原子,并具有一个可移动的正氢离子,所述取代基比直接连接到所述硫原子上的至少一个其他取代基显示出更高的能量占据分子轨道;
和至少一个取代基,该取代基包含一个电子撤回基团,并比直接连接在所述硫原子上的至少另一个取代基显示出更低的未占用分子轨道能量;
所述盐在暴露于可见辐射时,能够发生不可逆的分子内重排,形成由所述盐的阴离子和所述可移动的正氢离子组成的布郎斯特德酸。