Photosensitive compositions for direct positive color photography
AssigneeRichard L. Scully
InventorJean J. A. Robillard
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Abstract
The invention relates to a photosensitive composition for direct positive color photography. The photosensitive composition comprises a binder containing a plurality of grains of a semiconductor material, each grain having adsorbed on its surface one of three different complexes of spiropyran with a metal salt, each complex being sensitive to a different wavelength of light, a cross-linkable polymer and a free radical initiator. The photographic composition provides a non-silver photographic process based on the photo-decomposition of the metal-spiropyran complex absorbed on the grains of semiconductor material.
Claims19
A direct positive color photosensitive composition comprising a binder containing a plurality of grains of semiconductor each having adsorbed on its surface one of three different photo-bleachable colored complexes of spiropyran with a metal salt, each complex being sensitive to a different wavelength of light of the three primary colors red, blue and green, a crosslinkable polymer, and a free radical initiator.
A direct positive color photosensitive article comprising three superimposed layers of a transparent semiconductor material each having adsorbed on its surface a layer of a different one of three photo-decomposable complexes of spiropyran with a metal salt, each complex layer being sensitive to a different wavelength of light and including a crosslinkable polymer and a free radical initiator.
A direct positive color photosensitive article, which comprises:
- a substrate,
- a first doped organic semiconductor,
- a bleachable yellow spiropyran and metal salt complex dispersed or dissolved in a binder containing a crosslinkable polymer and additives to promote crosslinking;
- a second doped organic semiconductor layer,
- a bleachable magenta spiropyran and metal salt complex dispersed or dissolved in a binder containing a crosslinkable polymer and additives to promote crosslinking,
- a third doped organic semiconductor layer,
- a bleachable cyan spiropyran and metal salt complex dispersed or dissolved in a binder containing a crosslinkable polymer and additives to promote crosslinking.
Dependencies are inferred from the claim text.