STABILIZED p-PHENYLENEDIAMINE-TYPE PHOTOGRAPHIC COLOR DEVELOPERS IN FREE BASE FORM
Номер патента: EP1327181A2
Опубликовано: 16-07-2003
Автор(ы): Phillip Montgomery Hudnall
Принадлежит: Eastman Chemical Co
Опубликовано: 16-07-2003
Автор(ы): Phillip Montgomery Hudnall
Принадлежит: Eastman Chemical Co
Реферат: A stabilized p-phenylenediamine color developer solution having about 10 to 40 weight percent of a p-phenylenediamine free base color developer, about 40 to 70 weight percent of a hydroxy-containing organic solvent for the p-phenylenediamine free base color developer, and about 1 to 40 weight percent of a preservative for the p-phenylenediamine free base color developer,wherein the weight percentages are based on the total weight of the stabilized solution. Another aspect are processes for making stabilized p-phenylenediamine color developer solutions. Another embodiment is a p-phenylenediamine free base color developer, and from about 1 to 50 weight percent of a preservative for the p-phenylenediamine free base color developer, wherein the weight percentages are based on the total weight of the composition. Another aspect is a process for making the stabilized solid p-phenylendiamine color developer.
Stabilized p-phenylenediamine-type photographic color developers in free base form
Номер патента: US20020072017A1. Автор: Phillip Hudnall. Владелец: Eastman Chemical Co. Дата публикации: 2002-06-13.