申请人:MINNESOTA MINING AND MANUFACTURING COMPANY
公开号:EP0124296A1
公开(公告)日:1984-11-07
This invention involves thermographic imaging systems. The thermographic system under consideration comprises a euco dye, a nitrate salt, and, optionally, an acid and stabilizing :ompound. Dyes in their reduced leuco form can provide the pasis of color image forming systems. However, the leuco form of a given dye can often revert spontaneously to the colored form of the dye during manufacture unless the structure of the dye is altered to promote stability. In this invention, which involves stabilization of the leuco dye, the stabilized leuco dye contains a phenazine nucleus with naphthoyl substituents on the 10-position and, optionally on one or both of the 3- and 7-positions through an amino group.
In their oxidized form, the leuco dyes of this invention orovide access to a range of red and magenta colors which ex- nibit greater stability when subjected to light and temperatures characteristic of the stage of overhead projectors than that exhibited by previously available leuco dyes of this color range.
本发明涉及热成像系统。所考虑的热成像系统包括一种还原型染料、一种硝酸盐,以及可选的酸和稳定剂。还原型染料可以提供彩色图像形成系统的色彩。然而,除非改变染料的结构以提高稳定性,否则在生产过程中,特定染料的还原型通常会自发地还原成染料的有色型。本发明涉及白基染料的稳定化,稳定化的白基染料包含一个酚嗪核,在 10 位上有萘甲酰基取代基,在 3 位和 7 位的一个或两个位置上可选择通过氨基来取代。
在氧化形式下,本发明的白兰地染料可产生一系列红色和品红色,在高射投影仪舞台的光照和温度条件下,其稳定性比以前可获得的该颜色范围的白兰地染料更强。