Electron donor precursors and photographic elements containing them
Номер патента: CA1138246A
Опубликовано: 28-12-1982
Автор(ы): Chin H. Chen
Принадлежит: Eastman Kodak Co
Опубликовано: 28-12-1982
Автор(ы): Chin H. Chen
Принадлежит: Eastman Kodak Co
Реферат: Abstract of the Disclosure Novel electron donor precursors have the structure: wherein: Z represents the atoms to complete a mono-, bi- or tricyclic ring system, each ring of which contains 5 to 6 nuclear atoms; n is 1 or 2; R1 is a monovalent aromatic group when n is 1 and a bivalent aromatic group when n is 2; and R2 represents hydrogen, an alkyl Group, an aryl group, an acyl group, an ester group or an amido group. The compounds are useful in photographic elements, film units and processes to provide electrons to immobile compounds which must accept at least one electron before releasing a diffusible dye or photographic reagent.
Benzotriazole-based UV absorbers and photographic elements containing them
Номер патента: US5683861A. Автор: Lal C. Vishwakarma,Glenn M. Brown. Владелец: Eastman Kodak Co. Дата публикации: 1997-11-04.