申请人:EASTMAN KODAK COMPANY
公开号:EP0683427A1
公开(公告)日:1995-11-22
A photographic element having a silver halide emulsion spectrally sensitized to blue light by a dye of formula (I) to have a maximum blue sensitivity at less than 485nm. The dye allows the element to have good color reproduction while still providing good speed response despite the shorter blue sensitivity. Formula (I) is:
wherein:
X and X' each independently represent the atoms necessary to complete a thiazole, benzothiazole, naphthothiazole, oxazole, benzoxazole, naphthoxazole, selenazole, benzoselenazole, naphthoselenazole, imidazole, benzimidazole, or naphtho-imidazole, and X may be further substituted and X' substituted or unsubstituted;
Z₁ represents a pyrrole or furan containing group (although Z₁ could represent any heterocyclic aromatic ring when it is directly appended to the ring formed by X and N);
R₁ and R₂ each independently represent substituted or unsubstituted hydrocarbon containing 1 to 10 carbon atoms; and
A represents a counter-ion as needed to balance a charge of the molecule.
一种感光元件,其卤化银乳剂通过式(I)染料对蓝光进行光谱感光,最大蓝光感光度小于 485 纳米。尽管蓝光感光度较低,该染料仍能使感光元件具有良好的色彩再现能力,同时提供良好的速度响应。式(I)为
其中
X 和 X'各自独立地代表完成噻唑、苯并噻唑、萘并噻唑、噁唑、苯并噁唑、萘并噁唑、硒唑、苯并硒唑、萘并硒唑、咪唑、苯并咪唑或萘并咪唑所需的原子,且 X 可被进一步取代,X'可被取代或未被取代;
Z₁ 代表含吡咯或呋喃的基团(但当 Z₁ 直接附加到 X 和 N 形成的环上时,可代表任何杂环芳香环);
R₁ 和 R₂ 各自独立地代表含有 1 至 10 个碳原子的取代或未取代的碳氢化合物;以及
A 代表平衡分子电荷所需的反离子。