http://rdf.ncbi.nlm.nih.gov/pubchem/patent/JP-H07330341-A
Outgoing Links
| Predicate | Object |
|---|---|
| assignee | http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_5fb9798bf05293ffe6d2e0fde58c3cdb |
| classificationIPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/G03G9-083 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C01G49-08 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C01G49-06 |
| filingDate | 1994-06-09-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| inventor | http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_9706b69215a6b0563150a18e9586763e http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_e1d023e258651d9be7be9602285ce482 http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_ec6516b37873c976a0b6feef9f7b1eb9 |
| publicationDate | 1995-12-19-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber | JP-H07330341-A |
| titleOfInvention | Method for producing acicular magnetic iron oxide particle powder |
| abstract | (57) [Abstract] [Purpose] Industrial production of needle-shaped magnetic iron oxide particles having a uniform particle size, no dendritic particles mixed, and a large axial ratio (major axis diameter / minor axis diameter). A method for producing the same is provided. [Structure] An oxygen-containing gas is passed through a reaction solution containing an iron-containing precipitate obtained by reacting an aqueous solution of a ferrous salt and an aqueous alkali solution of less than equivalent amount to generate needle-shaped goethite core particles, The ferrous salt reaction solution containing the acicular goethite nucleus particles is aerated with an oxygen-containing gas while adding an alkaline aqueous solution so as to maintain the pH value of the solution within the range of 3 to 6. Needle-like magnetite particles are formed by performing a particle growth reaction, and then needle-like magnetite particles are obtained by reducing the needle-like goethite particles, or needle-like magnetite particles are further oxidized to obtain needle-like maghemite particles. In the method for producing iron oxide particle powder, ascorbic acid or a salt thereof is allowed to be present in the reaction solution for producing needle-shaped goethite particles in advance, and water is added to the reaction solution during the growth reaction. Obtained by adding soluble silicate continuously or intermittently. |
| isCitedBy | http://rdf.ncbi.nlm.nih.gov/pubchem/patent/KR-100888051-B1 |
| priorityDate | 1994-06-09-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| type | http://data.epo.org/linked-data/def/patent/Publication |
Incoming Links
Total number of triples: 57.