Photographic recording material for accelerated development

摘要

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): CAR<1>-(L)n-ETA wherein: CAR<1> 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; and ETA 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 CAR<1> 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): CAR<2>-(SAM)-NX<1>-NX<2>X<3> wherein: CAR<2> is a carrier moiety which is capable of releasing -(SAM)-NX<1>-NX<2>X<3> on reaction with oxidized developing agent; SAM is a silver absorbable moiety attached to the carrier moiety and is released on reaction with oxidized development agent; and -NX<1>-NX<2>X<3> is a hydrazine group wherein X<1>, X<2> and X<3> are individually hydrogen or a substituent chosen from alkyl, aryl, carbonyl or sulfonyl groups with the proviso that at least one of X<1>, X<2> and X<3> is hydrogen.