公开(公告)号：US5212056A

公开(公告)日：1993-05-18

申请号：US858308

申请日：1992-03-25

Applicant: Walter Beltramini ,  Ivano Delprato

Inventor： Walter Beltramini ,  Ivano Delprato

IPC: G03C1/28 ,  G03C1/34 ,  G03C7/20 ,  G03C7/36

CPC classification number: G03C1/346 ,  G03C1/28

Abstract: A multilayer silver halide color photographic element comprising at least one blue-sensitive silver halide emulsion layer comprising a blue spectral sensitizing dye and a supersensitizing amount of a disulfide compound of formula ##STR1## wherein R.sub.1, R.sub.2, R.sub.3 and R.sub.4, equal or different, each represents a hydrogen atom or a lower alkyl group, R.sub.5 represents a hydrogen atom, a formyl group or an acetyl group, R.sub.6 and R.sub.7, equal or different, each represents a hydrogen atom or a lower alkyl group, or R.sub.6 and R.sub.7 represent the elements needed to complete an unsaturated cyclic nucleus.The combination provides a blue-sensitive silver halide emulsion layer having high sensitivity, low fog and good resistance against fading of the latent image.

公开(公告)号：US4780400A

公开(公告)日：1988-10-25

申请号：US40284

申请日：1987-04-20

Applicant: Walter Beltramini ,  Francesco Squarcia

Inventor： Walter Beltramini ,  Francesco Squarcia

IPC: G03C1/06 ,  C07D277/22 ,  C07D277/32 ,  G03C1/34

CPC classification number: C07D277/22 ,  C07D277/32 ,  G03C1/34

Abstract: Silver halide light-sensitive emulsions are protected against latent image fading by an effective amount of a 2-unsubstituted N-alkenyl-thiazolium salt compound.

Abstract translation: 通过有效量的2-未取代的N-烯基 - 噻唑鎓盐化合物来保护卤化银感光乳剂免于潜影褪色。

公开(公告)号：US4777122A

公开(公告)日：1988-10-11

申请号：US18276

申请日：1987-02-24

Applicant: Walter Beltramini

Inventor： Walter Beltramini

IPC: G03C7/32 ,  G03C7/30 ,  G03C7/34 ,  G03C1/46

CPC classification number: G03C7/3029 ,  G03C2200/53

Abstract: A high sensitivity multilayer color photographic material is disclosed. The material is comprised of a support base having coated thereon red-sensitive, green-sensitive and blue-sensitive silver halide emulsion layers associated with non-diffusing image-forming couplers. The red-sensitive silver halide emulsion layer comprises an upper, an intermediate and a lower silver halide emulsion layer, sensitive to visible light in the same or substantially the same spectral wavelength range, with the sensitivity of the layers decreasing in order from the upper layer to the lower layer. The green-sensitive silver halide emulsion layer comprises an upper and a lower silver halide emulsion layer, sensitive to visible light in about the same spectral wavelength range, with the sensitivity of the layers decreasing in order from the upper layer to the lower layer. The most sensitive red-sensitive silver halide emulsion layer is arranged between the less senitive and the more sensitive green-sensitive silver halide emulsion layers. The most sensitive red-sensitive silver halide emulsion layer comprises at least one non-diffusing cyan coupler and the more sensitive green-sensitive silver halide emulsion layer comprises at least one non-diffusing magenta coupler, relative coupling rates of said cyan and magenta couplers being higher than couplers forming the same color in the respective layers of lower same-wave-length sensitivity.

Abstract translation: 公开了一种高灵敏度多层彩色照相材料。 该材料由其上涂覆有与非扩散图像形成成色剂相关联的红色敏感，绿色敏感和感蓝卤化银乳剂层的支撑基底组成。 感红卤化银乳剂层包括对相同或基本上相同的光谱波长范围的可见光敏感的上部，中间和低级卤化银乳剂层，其中层的灵敏度依次从上层 到下层。 感绿卤化银乳剂层包括上和下卤化​​银乳剂层，对大约相同光谱波长范围的可见光敏感，其中层的灵敏度从上层到下层依次减小。 最敏感的感红卤化银乳剂层布置在较不老式和较敏感的感光卤化银乳剂层之间。 最敏感的感红卤化银乳剂层包含至少一种非扩散青色成色剂，较敏感的感绿卤化银乳剂层包含至少一种非扩散品红成色剂，所述青色和品红色成色剂的相对耦合速率为 高于在较低相同波长灵敏度的各层中形成相同颜色的成色剂。