http://rdf.ncbi.nlm.nih.gov/pubchem/patent/GB-447748-A
Outgoing Links
| Predicate | Object |
|---|---|
| assignee | http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_9799ffcda2dbb45041a5ab0fd08dd5fe |
| classificationCPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/G03C1-831 http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/G03C1-83 |
| classificationIPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/G03C1-83 |
| filingDate | 1934-09-24-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationDate | 1936-05-25-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber | GB-447748-A |
| titleOfInvention | Improvements relating to sensitive photographic elements |
| abstract | Screening-layers for photographic sensitive material consist of a carrier and a dye containing an aldehyde group as substituent. Suitable dyes are the aldehyde substituted benzene- and naphthalene-azo-phenols and aldehyde substituted fluorescein dyes. Aldehyde substituted benzene-azo-resorcinol, benzene-azo-cresol, and Diamond Yellow G are suitable. Examples are given of the preparation of: (1) 2-hydroxy-5-phenylazo-benzaldehyde by coupling benzene diazonium chloride with salicylaldehyde in caustic soda solution; (2) 2 : 4-dihydroxy-5-phenylazo-benzaldehyde by coupling benzene diazonium chloride with resorcylaldehyde and precipitating with sodium acetate; (3) 3-resorcylazo-benzaldehyde by coupling diazotized m - nitrobenzaldehyde with resorcinol; (4) 2-hydroxy-5-a -naphthylazo-benzaldehyde by coupling diazotized a - naphthylamine with salicylaldehyde; (5) p:p<1> - diphenyl - disazophenol-salicylaldehyde by coupling diazotized benzidine with phenol and salicylaldehyde; (6) the disalicylaldehyde corresponding to (5); (7) the disulphonic acid derivative of (6) starting from benzidine disulphonic acid; and (8) 4 : 4<1>-diphenyl-disazo-salicylaldehyde-salicylic acid by coupling diazotized benzidine with salicylaldehyde and salicylic acid. The dyes formed by coupling nitroso-dialkylanilines with hydroxy benzaldehydes may also be used. The dyes are decoloured by an acid permanganate or quinone bromide bleach bath. Specifications 440,032, 444,198, and 447,092, [all in Group XX], are referred to. |
| isCitedBy | http://rdf.ncbi.nlm.nih.gov/pubchem/patent/DE-744264-C |
| priorityDate | 1934-09-24-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| type | http://data.epo.org/linked-data/def/patent/Publication |
Incoming Links
Total number of triples: 46.