Photographic recording material for accelerated development
US6756188B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 16, 2002 |
| Grant date | Jun 29, 2004 |
| Priority date | — |
| Expiry date | Sep 16, 2022 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S430/156
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
This invention relates to a photographic element comprising a support and at least two silver halide emulsion layers further comprising, an electron transfer agent releasing compound represented by the formula (I):CAR1—(L)n—ETA  (I)wherein:CAR1 is a carrier moiety which is capable of releasing —(L)n-ETA on reaction with oxidized developing agent;L is a divalent linking group, n is 0, 1 or 2; andETA is a releasable 1-aryl-3-pyrazolidinone electron transfer agent having a calculated log partition coefficient (c log P) greater than or equal to 2.40 and the total sum of the Hammett sigma(para) values of the substituents on the 1-aryl ring is 0.51 or less, the ETA being bonded to L or CAR1 through either the nitrogen atom in the 2-position or the oxygen attached to the 3-position of the pyrazolidinone ring;and a development accelerator releasing compound represented by the formula (II):CAR2—(SAM)—NX1—NX2X3  (II)wherein:CAR2 is a carrier moiety which is capable of releasing —(SAM)—NX1—NX2X3 on reaction with oxidized developing agent;SAM is a silver absorbable moiety attached to the carrier moiety and is release…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.