Invention Grant
- Patent Title: Blocked leuco dyes for photothermographic elements
- Patent Title (中): 用于光热敏成像元件的封闭无色染料
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Application No.: US269438Application Date: 1994-06-30
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Publication No.: US5492805APublication Date: 1996-02-20
- Inventor: Larry R. Krepski , Sharon M. Simpson , Kim M. Vogel
- Applicant: Larry R. Krepski , Sharon M. Simpson , Kim M. Vogel
- Applicant Address: MN St. Paul
- Assignee: Minnesota Mining and Manufacturing Company
- Current Assignee: Minnesota Mining and Manufacturing Company
- Current Assignee Address: MN St. Paul
- Main IPC: G03C8/40
- IPC: G03C8/40 ; C07C311/60 ; G03C1/498
Abstract:
A photothermographic element containing a support bearing at least one heat-developable, photosensitive, image-forming photothermographic emulsion layer is provided. The emulsion layer comprises:(a) a photosensitive silver halide;(b) a non-photosensitive, reducible source of silver;(c) a leuco dye reducing agent; and(d) a binder;wherein the leuco dye reducing agent comprises a blocked leuco dye compound of the general formula L-R.sup.1, which is capable of being oxidized to a colored form, wherein:(i) L is a group remaining after removal of a hydrogen from a leuco dye; and(ii) R.sup.1 is a C(O)--NH--SO.sub.2 --R.sup.5 group wherein R.sup.5 is an aliphatic group or an aromatic group.
Public/Granted literature
- US4912426A Amplifier circuit Public/Granted day:1990-03-27
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