http://rdf.ncbi.nlm.nih.gov/pubchem/patent/JP-S5569150-A
Outgoing Links
| Predicate | Object |
|---|---|
| assignee | http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_1aeb547e41bcced0c8569159a97514be |
| classificationIPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C01G49-08 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/H01F1-11 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/G03G9-083 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/G03G9-08 |
| filingDate | 1978-11-20-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| inventor | http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_210830b1ac0e7cd247bccd74221ab287 http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_f942e58bd9293d3e724bad87d95b2182 http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_c70ba29a15e8b2d8dab53817a1fa3e9c |
| publicationDate | 1980-05-24-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber | JP-S5569150-A |
| titleOfInvention | Production of magnetite powder for electrophotographic magnetic toner |
| abstract | PURPOSE: To stably produce the magnetic powder for high-performance magnetic toner which has high magnetizing force and coercive force, whose electric resisivity has suitable values as well, which is good in color tone, is high in heat resistance, is small in hygroscopicity, is good in mixing property with resins and does not cause deterioration of resins and change in electric characteristic by subjecting iron oxide to mechanical disintegration after firing. n CONSTITUTION: Iron oxide powder such as commercial α-Fe 2 O 3 , preferably of a grain size of 20 mesh or less, is fired for 1W10 hours at 1300W1500°C. Rate of temperature elevation is preferably about 100W200°C/hr. Cooling after firing may be 300°C/hr. To obtain the powder as magnetite of spinel structure, it is recommended to so adjust and control the oxygen partial pressure in the atmosphere as to become smaller than the atmospheric pressure at the time of firing and cooling. At the cooling in particular, O 2 content is kept 5vol% or less during the time of temperature lowering to about 1100°CW200°C. The material is taken out after the in-furnace temperature has lowered to 100°C or less. This fired product is disintegrated mehanically to mean grain sizes of 0.2W0.8μ. In this way, the magnetic powder for toner of always constant highly quality is obtained. n COPYRIGHT: (C)1980,JPO&Japio |
| isCitedBy | http://rdf.ncbi.nlm.nih.gov/pubchem/patent/JP-S59226353-A http://rdf.ncbi.nlm.nih.gov/pubchem/patent/JP-H0381145-B2 http://rdf.ncbi.nlm.nih.gov/pubchem/patent/JP-S58166358-A http://rdf.ncbi.nlm.nih.gov/pubchem/patent/JP-S581156-A http://rdf.ncbi.nlm.nih.gov/pubchem/patent/JP-S59121122-A http://rdf.ncbi.nlm.nih.gov/pubchem/patent/JP-S6131057-B2 http://rdf.ncbi.nlm.nih.gov/pubchem/patent/JP-S5964852-A |
| priorityDate | 1978-11-20-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| type | http://data.epo.org/linked-data/def/patent/Publication |
Incoming Links
Total number of triples: 28.