-
公开(公告)号：JPS6241722A
公开(公告)日：1987-02-23
申请号：JP15386185
申请日：1985-07-12
Applicant: KAO CORP
Inventor： NAKAYAMA KAZUHIKO , ITO YUJI , MONNO YASUO , HAISHI TOMOYUKI , TAKEDA TSUNESHI
Abstract: PURPOSE:To produce fine lamellar hematite powder having uniform particle diameters, by heating an aqueous slurry composition which comprises a ferric salt, tartaric acid or its salt and an alkali compound and has a composition to satisfy a specific pH condition, at a specific temperature. CONSTITUTION:Aqueous slurry comprising a ferric salt such as FeCl3, etc., tartaric acid and/or its salt and a third component of an alkali compound such as NaOH, etc., is processed into a composition to satisfy a condition shown by formulas pH>=8.2 and (pH-6.6)/600 =120 deg.C and treated for about 10hr. By this treatment, lamellar hematite powder consisting of lamellar particles having an ogive wherein particle diameter of median is 0.01-1mum, particle diameter ratio of first quartile point to third quartile point is 0.67-1.50, particle diameter ratio of 1/10 point to 9/10 point is 0.-2.0 and lamellar ratio is >=2 is obtained.
-
公开(公告)号：JPS6362205A
公开(公告)日：1988-03-18
申请号：JP20653486
申请日：1986-09-02
Applicant: KAO CORP
Inventor： AOKI YOSHIO , HASEGAWA NORIO , MONNO YASUO
Abstract: PURPOSE:To obtain magnetic powder excellent in an oxidation-proofness, by using oxide powder obtained by reacting iron oxide or oxide powder, whose main component is iron oxide, with an aqueous solution, in which transition metal salt, or transition metal slat, and ferrous salt, and alkali are contained, under specific conditions. CONSTITUTION:Iron oxide powder or oxide powder whose main component is iron oxide is reacted with an aqueous solution in which transition metal salt and ferrous salt and alkali are contained. In this process, this aqueous solution is reacted for 2-15 hours at 70 deg.C or less under a non-oxygenous atmosphere and then the temperature in this system is raised to 80-100 deg.C and preferably this reaction is continued for 5-20 hours. On the surface obtained in this way, oxide or iron oxide having a compound layer containing transition metal is heated and reduced so that magnetic powder excellent in an oxidation- proofness can be obtained. As the iron oxide, gamma-Fe2O3 and alpha-Fe2O3 and the like are used. Salt without halogen is available for the transition metal salt. Cobalt, nickel, and chrome are suitable as the transition metal.
-
公开(公告)号：JPH02298004A
公开(公告)日：1990-12-10
申请号：JP11913489
申请日：1989-05-12
Applicant: KAO CORP
Inventor： ICHIKAWA HIROTSUGU , SUZUKI KENICHI , HASHIMOTO RYOICHI , MONNO YASUO , KOGA MASAAKI , AOKI YOSHIO
Abstract: PURPOSE:To prevent particles in a production stage from being sintered to each other and to obtain a ferromagnetic metal powder whose specific surface area is large and whose coercive force is high by a method wherein needle- shaped goethite which is subjected to a shape maintenance treatment is dehydrated and made voidless under a reducing atmosphere, it is transformed into magnetite, this is again subjected to the shape maintenance treatment and is reduced and a metal magnetic powder is obtained. CONSTITUTION:For example, goethite is dispersed in a solution; an Si compound and/or an Al compound are added; this mixture is stirred; after that, dilute nitric acid is added; a pH of this system is adjusted; the mixture is filtered, cleaned and dried; the goethite with a silicon compound layer is obtained. This goethite is reduced in a retort furnace while a mixed gas of hydrogen/nitrogen is flowing; magnetite is obtained. This magnetite is dispersed again in a solution; an Si compound and/or a phenolic resin are added and dispersed; after that, dilute nitric acid is added; a pH of this system is adjusted; this mixture is filtered, cleaned and dried; magnetite on which a silicon compound layer is formed newly is obtained. This magnetic is reduced in the retort furnace in a gas blow of hydrogen; a metal powder is obtained.
-
公开(公告)号：JPH01220409A
公开(公告)日：1989-09-04
申请号：JP4652988
申请日：1988-02-29
Applicant: KAO CORP
Inventor： MONNO YASUO , ICHIKAWA HIROTSUGU , KOGA MASAAKI , AOKI YOSHIO
Abstract: PURPOSE:To obtain ferromagnetic metal powder having good nonoxidizable stability and to enable high output and high density recording of a medium, by providing an aluminum compound layer and a nonferrous transition metal element compound layer on the surfaces of ferromagnetic metal particles. CONSTITUTION:Aluminum compound is so provided on the surfaces of ferromagnetic metal particles containing as a main ingredient iron that the quantity of the aluminum becomes 0.1-1wt.% to the ion, and a layer containing nonferrous transition metal element compound is further provided thereon. Further, after an aluminum compound film is formed on the surfaces of iron oxide or oxide particles containing as a main ingredient the iron oxide, it is treated in an aqueous solution containing salt of nonferrous transition metal element or ferrous salt and salt of nonferrous transition metal element and alkali, and a film containing the nonferrous transition metal element compound is formed on the aluminum compound film. Then, it is reduced without disordering their laminating order.
-
公开(公告)号：JPS649604A
公开(公告)日：1989-01-12
申请号：JP16427587
申请日：1987-07-01
Applicant: KAO CORP
Inventor： MONNO YASUO , ICHIKAWA HIROTSUGU , ARIKITA SHIYUUHEI , AOKI YOSHIO
Abstract: PURPOSE:To improve coercive force and oxidation resistance by controlling temperatures at specified values in the initial stage and the intermediaet stage of reduction, and performing reduction reaction in the initial stage of the reduction by using a mixture of hydrogen gas and inactive gas. CONSTITUTION:The temperature of the initial stage of reduction is made to be 370 deg.C or less. The temperature in the intermediate stage of the reduction is made to be 330-500 deg.C. In the initial stage of the reduction, the mixture of hydrogen gas and inactive gas is used. The initial stage of the reduction is a coexisting period of mainly Fe2O3 and Fe3O4 in the initial period of the reduction. This is the reduction step until the weight is reduced at least 1% and the maximum of 5% from the initial weight. The intermediate stage of the reduction is the reduction step from the end of the initial stage of the reduction to the final point, where the including amount of metal indicates at least 1% and the maximum of 5%. As the inactive gas to be used, nitrogen, argon, helium and the like are listed. lt is desirable that the mixing ratio of the hydrogen and the inactive gas in the initial stage of the reduction is in the range of hydrogen/inactive gas = 10/1-/100.
-
Patent Agency Ranking
公开(公告)号：JPS6236024A
公开(公告)日：1987-02-17
申请号：JP17344885
申请日：1985-08-07
Applicant: KAO CORP
Inventor： MONNO YASUO , ITO YUJI , NAKAYAMA KAZUHIKO , AOKI YOSHIO
Abstract: PURPOSE:To obtain magnetic powder for magnetic recording having high coercive force and excellent stability simply by using a small amt. of Co by stepwise increasing the temp. of the reaction to modify magnetic iron oxide powder with Co. CONSTITUTION:The magnetic iron oxide (preferably needle-like gamma-Fe2O3) is treated in an aq. soln. contg. a Co salt (e.g.; cobalt sulfate septahydrate) or Co salt and ferrous salt (e.g.; ferrous sulfate septahydrate) and alkali such as NaOH. The iron oxide is treated for 3-12hr at
-
公开(公告)号：JPH09276699A
公开(公告)日：1997-10-28
申请号：JP19442196
申请日：1996-07-24
Applicant: KAO CORP
Inventor： MONNO YASUO , HATTORI YASUYUKI , HORIO MASAMITSU , NAKAMURA FUMIHIKO
IPC: B01J23/745 , B01J23/78 , B01J23/80 , C07B61/00 , C07C29/149
Abstract: PROBLEM TO BE SOLVED: To provide a hydrogenating catalyst precursor not having a problem of environmental pollution possessed by a copper-chromium catalyst and enhanced in activity, durability and selectivity as compared with a conventional copper-iron-aluminum catalyst, a hydrogenating catalyst obtained by using the catalyst precursor and a method for producing an alcohol by using the hydrogenating catalyst. SOLUTION: This hydrogenating catalyst precursor contains a composite oxide containing copper, iron and aluminum in an atomic ratio of Cu: Fe:Al=1:(0.02-0.4):(1.0-4.0) and having a copper-aluminum spinnel structure as a main component and this hydrogenating catalyst is obtained by using the catalyst precursor. An alcohol is produced by using this catalyst.
-
公开(公告)号：JPH03291310A
公开(公告)日：1991-12-20
申请号：JP9172390
申请日：1990-04-06
Applicant: KAO CORP
Inventor： ICHIKAWA HIROTSUGU , MONNO YASUO , KOJIMA KATSUO , NAKAMURA HIROYUKI , AOKI YOSHIO
Abstract: PURPOSE:To improve dispersibility while maintaining excellent corrosion resistance by executing formation of the following layer under the specific condition in the manufacturing method for changing goethite, etc., forming the compound layer of silicone, etc., into magnetite and forming non-ferrous transition metal layer and further the above compound layer. CONSTITUTION:After changing the acicular goethite forming silicone and/or Al compound layer or the acicular goethite denaturated with metal other than iron into the magnetite, the non-ferrous transition metal compound layer is formed and further, the silicon or Al compound layer is formed. After that, this is reduced and the metal magnetic powder containing iron as the essential component having the layer, which contains non-ferrous transition metal element on the surface, is obtd. Then, either or both of the formation of silicon and/or Al compound layer onto the acicular goethite and the formation of non-ferrous transition metal compound layer onto the magnetite are executed while execut ing dispersion (>=1X10 Kw/m stirring motive power per unit liquid quantity of slurry differing from simple mixing and stirring) by a dispersing machine.
-
公开(公告)号：JPH01164006A
公开(公告)日：1989-06-28
申请号：JP4848888
申请日：1988-03-01
Applicant: KAO CORP
Inventor： MONNO YASUO , KOGA MASAAKI , AOKI YOSHIO
Abstract: PURPOSE:To make a resistance to oxidation better and to enhance both a coercive force and a saturation magnetization, by forming a layer in which a transition metal is contained in oxide powder on the surfaces of oxide particles which are the precursor of ferromagnetic metal powder and in which the basic constituent consists of iron oxide, under specific conditions. CONSTITUTION:A layer, which has a silicon compound layer containing 0.2-1.0wt.% silicon to the amount of iron in ferromagnetic metal powder and includes a non-ferrous transition metal compound on the silicon compound layer, is formed on the surfaces of ferromagnetic metal particles in which the basic constituent consists of iron. That is, after a silicon compound film is formed on the surfaces of oxide particles in which the basic constituent consists of iron oxide, a film which contains a non-ferrous transition metal is formed on the silicon compound film by employing an alkali and either a non-ferrous transition metal salt or a ferrous salt and the non-ferrous transition metal salt. Subsequently, reduction is performed without this laminating order being put into disorder.
-
公开(公告)号：JPS6241717A
公开(公告)日：1987-02-23
申请号：JP15386285
申请日：1985-07-12
Applicant: KAO CORP
Inventor： TAKEDA TSUNESHI , MONNO YASUO , ITO YUJI , NAKAYAMA KAZUHIKO , HAISHI TOMOYUKI
Abstract: PURPOSE:To obtain cubic plate magnetic powder having a uniform particle diameter ratio, by incorporating a ferric salt with tartaric acid and an alkali compound at a specific molar ratio, heat-treating the resultant aqueous slurry and reducing the resultant plate hematite in a hydrogen gas stream. CONSTITUTION:An aqueous slurry, consisting of three components of a ferric salt, tartaric acid (salt) and an alkali compound at >=8.2pH and satisfying conditions expressed by the formula is prepared. In the formula, r is the molar ratio of the tartaric acid (salt) to iron ions. The resultant slurry is then heated to >=120 deg.C to give plate hematite, which is further reduced in a hydrogen gas steam and, as desired, reoxidized and treated with a cobalt salt. The magnetic powder obtained by the method has 0.01-1mum particle diameter of the median value, 0.67-1.50 particle diameter ratio at the first quartile point and the third quartile point and 0.5-2.0 particle diameter ratio at the 1/10 fraction point to 9/10 fraction point in a cumulative distribution curve of plate surface area. The plate form ratio is >=2, and the powder has improved magnetic characteristics as a magnetic recording medium.
-
-
-
-
-
-
-
-
-
Search Results
10
records
(took 0.023 seconds)
