http://rdf.ncbi.nlm.nih.gov/pubchem/patent/GB-1157502-A
Outgoing Links
| Predicate | Object |
|---|---|
| assignee | http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_315d611c240458b1308de8455144105a |
| classificationCPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/G03C8-10 |
| classificationIPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/G03C8-10 |
| filingDate | 1965-09-10-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| inventor | http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_276de315c36d3c4ab24b2f72918085d1 http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_6d2b0c63e99449c608942467b0049593 |
| publicationDate | 1969-07-09-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber | GB-1157502-A |
| titleOfInvention | Photographic Colour Transfer Process. |
| abstract | 1,157,502. Photographic colour transfer process. ILFORD Ltd. Sept. 8, 1966 [Sept. 10, 1965], No.38747/65. Heading G2C. [Also in Division C2C. In a photographic colour transfer process giving a positive colour image and comprising exposing a photo-sensitive silver halide element containing in the emulsion layer or in an adjacent layer a non-diffusible colour coupler which becomes diffusible at a high pH, developing with a liquid processing solution in the presence of a colour developer at a pH below said high pH to form an immobile dye at exposed areas, treating with an alkaline solution of pH at or above said high pH to solubilize the colour coupler in the unexposed areas and contacting the element with an imagereceiving layer to allow imagewise diffusion of the colour coupler, the treatment with the alkaline solution at or above the high pH is conducted in the presence of a development restraining substance. The colour coupler may be coloured and itself, form the colour image or it may be colourless in which case the image-receiving layer containing diffused coupler is treated with a colour developer under oxidizing conditions, e.g. in the presence of an oxidizing agent or electrolytic oxidation. The development restrainer substance may be an anti-foggant compound such as benzotriazole, 5-nitro-, 5-methyl- or 2-amino-benzimidazole, 1-phenyl-5-mercaptotetrazole, 2-mercaptobenzothiazole, thioacetanilide or mixtures thereof, and may be present in the high pH alkaline solution, in the image-receiving element or in a layer of the photo-sensitive element separate from the emulsion layers or layers containing couplers. The restrainer may become diffusible only at the high pH used for the transfer step, e.g. it may contain groups, such as phenolic hydroxyl, sulphonamide or substituted sulphonamide, such that it is ionized only at high pH, or it may contain groups hydrolyzed only at high pH, e.g. long chain esters of oxalic acid. The colour coupler may be diffusible only at high pH by virtue of a hydrolysable long chain anchoring group e.g. an ester of oxalic acid or by incorporation in a water immisible mat material which is slowly permeable by alkali or by incorporation in a slowly hydrolysable material. The developing agent may be incorporated in the liquid processing solution, in the emulsion layer or in the image-receiving element. |
| priorityDate | 1965-09-10-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| type | http://data.epo.org/linked-data/def/patent/Publication |
Incoming Links
Total number of triples: 32.