The present invention provides a novel process for the production of organic solvent soluble squaraine dyes. More specifically, the invention describes how a difficult to prepare tetrahydroxy squaraine intermediate can be prepared in an organic solvent system in the presence of water. This intermediate can then be esterified in pyridine to form the soluble squaraine dye which can then be easily isolated from the reaction mixture. The invention also provides the dyes prepared according to this method.
申请公布号
WO9745492(A1)
申请公布日期
1997.12.04
申请号
WO1996US16325
申请日期
1996.10.15
申请人
MINNESOTA MINING AND MANUFACTURING COMPANY
发明人
MADER, ROGER, A.;RAMSDEN, WILLIAM, D.;SPAWN, TERENCE, D.;SADDORIS, DANIEL, E.