申请人:KONICA CORPORATION
公开号:EP0342987A1
公开(公告)日:1989-11-23
An improved silver halide photographic material having at least one layer of a light-sensitive silver halide emulsion that is spectrally sensitized with a sensitizing dye of the following general formula (1) to light having a wavelength of 750 nm and above. Said silver halide emulsion is prepared by a process which comprises generating silver halide grains by adding a solution of a water-soluble silver salt and a solution of a water-soluble halide to a solution containing a protective colloid, aggregating the generated silver halide grains with a polymeric flocculating together with the protective colloid, and removing the dissolved matter;
where Z₁ and Z₃ each represents the non-metallic atomic group necessary to form an optionally substituted benzothiazole, benzoxazole, naphthothiazole or naphthoxazole nucleus; R₁ and R₂ each represents a saturated or unsaturated aliphatic group; Z₂ represents a 5- or 6-membered ring of carbon atoms; A represents a hydrogen atom when Z₂ is a 6-membered ring; X⊖ is an anion; and n is 1 or 2.
一种改进的卤化银照相材料,它至少有一层感光卤化银乳剂,用下式(1)的感光染料对波长 750nm 及以上的光进行光谱感光。所述卤化银乳剂的制备方法包括:向含有保护胶体的溶液中加入水溶性银盐溶液和水溶性卤化物溶液,生成卤化银颗粒;将生成的卤化银颗粒与保护胶体一起用聚合物絮凝聚合;然后除去溶解物;
其中 Z₁ 和 Z₃ 各自代表形成任选取代的苯并噻唑、苯并恶唑、萘并噻唑或萘并恶唑核所需的非金属原子团;R₁ 和 R₂ 各自代表饱和或不饱和脂肪族基团; Z₂ 代表由碳原子组成的 5 或 6 元环;当 Z₂ 是 6 元环时,A 代表氢原子; X⊖ 是阴离子;以及 n 是 1 或 2。