Photographic emulsions and elements containing blocked 5-pyrazolone magenta dye-forming couplers
申请人:EASTMAN KODAK COMPANY
(a New Jersey corporation)
公开号:EP0034951A2
公开(公告)日:1981-09-02
5-pyrazolone magenta dye-forming couplers blocked with a coupler group which yields an alkali-soluble or colorless reaction product are disclosed. The coupler group is joined via its coupling position to the enol oxygen of the 5-pyrazolone and is displaced therefrom during processing as a result of reaction by means of oxidized color developing agent to thereby activate the 5-pyrazolone coupler. These couplers have good reactivity and good resistance to aerial contaminants, such as formaldehyde, and can be incorporated in photographic emulsions and elements. The couplers can be incorporated in silver halide emulsions, and the emulsions can be coated on supports to prepare photographic elements.
本发明公开了一种 5-吡唑啉酮洋红色染料形成耦合剂,该耦合剂封端有一个耦合基团,可产生碱溶性或无色的反应产物。耦合剂基团通过其耦合位置与 5-吡唑酮的烯醇氧相连接,并在加工过程中通过氧化显色剂进行反应,从而活化 5-吡唑酮耦合剂。这些耦合剂具有良好的反应活性和对甲醛等空气污染物的良好耐受性,可以掺入感光乳剂和感光材料中。这些耦合剂可以掺入卤化银乳剂中,然后将乳剂涂在支撑物上,制备感光元件。