Direct dry negative color printing process and composition
AssigneeRichard L. Scully
InventorJean J. A. Robillard
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Abstract
The invention relates to a photosensitive composition for direct dry negative color printing composition. 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 free radical initiator. The composition and process enables photofinishing or printing from a negative.
Claims15
A direct negative color photosensitive composition comprising a binder containing a plurality of grains of semiconductor each having absorbed 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 three colors viz. yellow, magenta and cyan, a crosslinkable polymer, and a free radical initiator.
A direct negative color photosensitive article, which comprises:
- a substrate,
- a first doped organic semiconductor,
- a bleachable blue 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 green 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 red 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.