| (19) |
 |
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(11) |
EP 0 177 328 A3 |
| (12) |
EUROPEAN PATENT APPLICATION |
| (88) |
Date of publication A3: |
|
07.01.1988 Bulletin 1988/01 |
| (43) |
Date of publication A2: |
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09.04.1986 Bulletin 1986/15 |
| (22) |
Date of filing: 01.10.1985 |
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| (84) |
Designated Contracting States: |
|
DE FR GB IT |
| (30) |
Priority: |
01.10.1984 US 656690
|
| (71) |
Applicant: MINNESOTA MINING AND MANUFACTURING COMPANY |
|
() |
|
| (72) |
Inventors: |
|
- Bellus, Peter A. Minnesota Mining and
()
- Frenchik, Robert A. Minnesota Mining and
()
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| |
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| (54) |
Photothermograhic accelerators for leuco diazine, oxazine, and thiazine dyes |
(57) A photothermographic construction comprises a light-sensitive color-forming element
on a support base, the element comprising a silver source, optionally silver halide,
a binder, and an oxidizable leuco phenazine, phenoxazine, or phenothiazine dye, and
as development accelerator a carboxylic acid, Lewis acid, or Bronsted acid.