http://rdf.ncbi.nlm.nih.gov/pubchem/patent/GB-583508-A
Outgoing Links
| Predicate | Object |
|---|---|
| assignee | http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_1e70c0aeade92d7571d955d3b90ea06e |
| classificationCPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/G03C5-16 http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/G03C1-825 |
| classificationIPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/G03C1-825 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/G03C5-16 |
| filingDate | 1944-10-13-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationDate | 1946-12-19-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber | GB-583508-A |
| titleOfInvention | Photographic elements |
| abstract | 583,508. Photographic and radiographic sensitive materials. DU PONT DE NEMOURS & CO., E. I. Oct. 13, 1944, No. 19781. Convention date, Jan. 1. [Classes 98 (i) and 98 (ii)] A photographic element comprises at least one light-sensitive layer and at least one outer layer composed of casein and gelatin in the proportion of 10 to 20 respectively, the outer layer containing a non-diffusing, finely-divided, inert pigment uniformly dispersed therethrough which is absorbent of light to which the lightsensitive layer is sensitive. The outer layer may function as an antihalation layer, but the invention is especially concerned with elements containing two outer pigmented layers for use in radiography. The pigment may be colloidal carbon, finely-divided carbon black or colloidal silver, the amount varying over a wide range, but always sufficient to prevent penetration of diffuse daylight or ordinary room illummation, e.g. one part by weight of pigment to 20 parts of colloid or two parts of pigment to one part of colloid. The pigments are dispensed in an aqueous solution of gelatin and casein, wetting or dispersing agents being added such as ammonium alkyl sulphates, e.g. sodium octyl sulphate, sodium tetradecyl sulphate, sodium hexadecyl sulphate, ammonium octadecyl sulphate, and sodium oleyl sulphate ; lower alkyl (1-4 C atoms) naphthalene sulphonic acid salts, e.g. tri-isopropyl naphthalene sulphonic acid ; alkane sulphonic acid sodium salts, e.g. sodium n-hexadecane sulphonic acid ; and the condensation products of ethylol cyanamides with, e.g. lauric, stearic and palmitic acids. The coating is done by spreading, spraying, dipping, transfer or beading rollers. In the examples, the cellulose acetate base with or without a thin coating of nitrocellulose, is coated on each side with gelatin and then the silver halide emulsion, followed by the dispersion composition. After exposure, the outer layers are easily removed by soaking in water and swabbing -with cotton. The layers are stated to be abrasion-resistant and to have good anti-static properties. |
| isCitedBy | http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-3511660-A |
| priorityDate | 1944-01-01-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| type | http://data.epo.org/linked-data/def/patent/Publication |
Incoming Links
Total number of triples: 45.