发明授权
US5935770A Composition for processing roomlight handleable radiographic films using
two-stage development
失效
用于处理室内可处理的射线照相胶片的组合物,使用两阶段发展
- 专利标题: Composition for processing roomlight handleable radiographic films using two-stage development
- 专利标题(中): 用于处理室内可处理的射线照相胶片的组合物,使用两阶段发展
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申请号: US144999申请日: 1998-09-01
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公开(公告)号: US5935770A公开(公告)日: 1999-08-10
- 发明人: Alan S. Fitterman , Jeffrey S. Baugher , Robert E. Dickerson
- 申请人: Alan S. Fitterman , Jeffrey S. Baugher , Robert E. Dickerson
- 申请人地址: NY Rochester
- 专利权人: Eastman Kodak Company
- 当前专利权人: Eastman Kodak Company
- 当前专利权人地址: NY Rochester
- 主分类号: G03C1/005
- IPC分类号: G03C1/005 ; G03C1/36 ; G03C1/83 ; G03C5/16 ; G03C5/26 ; G03C5/38 ; G03D3/06 ; G03D13/06
摘要:
Black-and-white elements, such as radiographic films, can be processed in roomlight because they include certain light absorbing dyes and desensitizers. Processing is carried out by processing the exposed element using a two-stage process in the same light-tight processing container. In the first stage, development is initiated with a developing composition having a pH of from about 10 to about 12.5, and comprising an appropriate black-and-white developing agent in a concentration of from about 0.1 to about 0.5 mol/l, and a sulfite at from about 0.25 to about 0.7 mol/l. After an appropriate time, a fixing agent (other than a sulfite) is introduced into the processing container to provide a combined developing/fixing compositions, and development and fixing are carried out simultaneously. The processing method is carried out quickly, usually within about 90 seconds, including a washing step at the end. The presence of sulfite and high pH in both stages decolorize or deactivate the particulate dyes.
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