发明授权
US3615639A Direct positive silver halide emulsions containing dyes as electron acceptors and spectral sensitizers
失效
含有染料作为电子受体和光谱敏感剂的直接阳性银盐乳液
- 专利标题： Direct positive silver halide emulsions containing dyes as electron acceptors and spectral sensitizers
- 专利标题（中）： 含有染料作为电子受体和光谱敏感剂的直接阳性银盐乳液
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申请号： US3615639D申请日： 1967-10-23
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公开(公告)号： US3615639A公开(公告)日： 1971-10-26
- 发明人: CARPENTER JAMES W , MEE JOHN D , HESELTINE DONALD W
- 申请人： EASTMAN KODAK CO
- 专利权人： Eastman Kodak Co
- 当前专利权人： Eastman Kodak Co
- 优先权： US67705867 1967-10-23
- 主分类号： C07D471/04
- IPC分类号： C07D471/04 ; C07D487/04 ; C07D513/04 ; C09B23/10 ; G03C1/485 ; G03C1/10
摘要：
Novel polymethine dyes are provided which feature an imidazole ring joined at the carbon atom in the 5-position of the imidazole ring to a dimethine linkage, the imidazole ring having fused to the (a ) side thereof the nonmetallic atoms required to complete at least one fused ring, and a second desensitizing nucleus joined at a carbon thereof to the dimethine linkage. The invention also provides novel photographic silver halide emulsions, including direct positive emulsions containing the dyes of the invention.
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