Improvements in sensitized photographic emulsions
Реферат: 764,658. Supersensitized photographic emulsions. KODAK,. Ltd. Feb. 15, 1955 [Feb. 16, 1954], No. 4417/55. Drawings to Specification. Class 98(2) Photographic silver halide emulsions are supersensitized with a combination of a cyanine dye of the general formula wherein R and R 1 are alkyl or substituted alkyl groups or together form an ethylene or propylene group, X is an anion and Z and Z 1 complete heterocyclic nuclei, and a carbocyanine dye of the general formula wherein R, and R 3 are alkyl or allyl groups, n is 1 or 2 and X 1 is an anion. R, R 1 , R 2 and R 3 are preferably methyl or ethyl groups, but R and R 1 may also be n-propyl or carbethoxymethyl. In the examples, Z or Z 1 completes a benzthiazole, benzselenazole, benzoxazole, haphthothiazole, naphthoselenazole, 5:6-methylenedioxy-benzthiazole, 5-phenyl-benzthiazole, 2-quinoline or 6-methoxy-2-quinoline nucleus. Specifications 498,031, 498,289, 498,290, 498,291, 581,772, 610,064, 754,546 and U.S.A. Specification 2,541,000 are referred to.
Improvements in sensitized photographic emulsions
Номер патента: GB764626A. Автор: . Владелец: Kodak Ltd. Дата публикации: 1956-12-28.