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Blocked leuco dyes for photothermographic elements    
United States Patent5492805   
Link to this pagehttp://www.wikipatents.com/5492805.html
Inventor(s)Krepski; Larry R. (White Bear Lake, MN); Simpson; Sharon M. (Lake Elmo, MN); Vogel; Kim M. (Lake Elmo, MN)
AbstractA 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.
   














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Patent Text Patent PDF Print Page Summary File History
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Inventor     Krepski; Larry R. (White Bear Lake, MN); Simpson; Sharon M. (Lake Elmo, MN); Vogel; Kim M. (Lake Elmo, MN)
Owner/Assignee     Minnesota Mining and Manufacturing Company (St. Paul, MN)
Patent assignment
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Publication Date     February 20, 1996
Application Number     08/269,438
PAIR File History     Application Data   Transaction History
Image File Wrapper   Patent Term   Fees
Litigation
Filing Date     June 30, 1994
US Classification     430/619 430/201 430/203 430/211 430/256 430/348 430/955
Int'l Classification     G03C 001/498
Examiner     Chea; Thorl
Assistant Examiner    
Attorney/Law Firm     Griswold; Gary L. Kirn; Walter N. , Evearitt; Gregory A. ,
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Priority Data    
USPTO Field of Search     430/619 430/955 430/203 430/211 430/224 430/223 430/201 430/256 430/348
Patent Tags     blocked leuco dyes photothermographic elements
   
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