http://rdf.ncbi.nlm.nih.gov/pubchem/patent/GB-1009379-A
Outgoing Links
| Predicate | Object |
|---|---|
| assignee | http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_5736c85c1929ce4e9775e836a65d6c05 |
| classificationCPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/G03G5-087 |
| classificationIPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/G03G5-087 |
| filingDate | 1962-08-08-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationDate | 1965-11-10-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber | GB-1009379-A |
| titleOfInvention | Electrophotographic materials and methods for producing electrostatic images |
| abstract | 1,009,379. Electrophotographic materials. ISHIHARA SANGYO KAISHA Ltd. Aug. 8, 1962 [Aug. 11, 1961; June 28, 1962], No. 30454/62. Heading H1K. Electrophotographic materials have photosensitive layers containing rutile (TiO 2 ) dispersed in an organic insulating binder. The dispersion, with or without a solvent, is coated on to a support of paper, baryta-coated paper, resin-coated paper, plastics, glass, a metal foil/ paper laminate, or a metal foil such as aluminium. The dried material may be used in this form or the photo-sensitive coating may be stripped from the support and used independently. Suitable binders are waxes, and natural and synthetic resins, for example resins of the following classes: phenolic, alkyd, polyester, polyamide, phenol modified alkyd, styrenated alkyd, vinyl, melamine, urea, silicone, aldehyde, ketone, balsam, cellulose, and colophony-based types; and carnauba wax, beeswax, shellac, paraffins, and casein. Rutile for use in materials of the invention may be made by calcination of hydrated titania obtained by hydrolysis of titanium tetrachloride or titanyl sulphate, or by thermal decomposition of titanium tetrachloride in the presence of oxygen-containing gases. Some impurities greatly inhibit the photosensitivity of rutile but neutral impurities, such as the anatase form of TiO 2 , may be used as diluents for the rutile. The electrophotographic materials of the invention fall into two categories: in the first type the sensitive layer acts as a normal photo-conductive insulator; in the second type the potential across the sensitive layer continues to rise slowly after completion of the charging stage, the potential rising more rapidly in the presence of illumination. Materials of the first type use binders such as modified alkyd resins and unsaturated polyester resins, and contain rutile whose sensitivity may be altered by doping with silver and/or copper. (The deposits are added as nitrates to precipitated TiO 2 which is then calcined.) The layer may contain sensitizers such as Rose Bengal or Rhodamine B, and can be supported on paper or metal foil paper laminates. Materials of the second type use binders such as alkyd resins, alcohol-soluble phenolic resins, and polyamide resins, and an insulating layer of one of these resins is preferably provided between the photo-sensitive layer and the support which consists of plastics material or baryta paper. Specific examples are given for both types of material. If similar developers are used for the two types, one of the materials will give a positive image and the other a negative image. The electrostatic latent image in materials of the first type consists of unexposed regions of high potential and exposed regions of lower or zero potential whereas the latent image of materials of the second type has its unexposed regions substantially at the potential obtained at the completion of the charging process and its exposed regions at some higher potential. |
| isCitedBy | http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-5173386-A http://rdf.ncbi.nlm.nih.gov/pubchem/patent/EP-0631192-A2 http://rdf.ncbi.nlm.nih.gov/pubchem/patent/EP-0631192-A3 http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-3946401-A http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-3837850-A http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-3941594-A |
| priorityDate | 1961-08-11-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| type | http://data.epo.org/linked-data/def/patent/Publication |
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