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公开(公告)号：JP2003155424A
公开(公告)日：2003-05-30
申请号：JP2002254001
申请日：2002-08-30
Applicant: TODA KOGYO CORP
Inventor： HAYASHI KAZUYUKI , MORII HIROKO , SAKOTA MINEKO , OSUGI MINORU
IPC: C01G49/02 , C09C3/12 , C09D7/12 , C09D201/00
Abstract: PROBLEM TO BE SOLVED: To provide an inorganic colored particle powder which excels in easy dispersibility, dispersion uniformity, and dispersion stability in a vehicle, and a production method which can industrially obtain the inorganic colored particle powder. SOLUTION: The inorganic colored particle powder is composed of inorganic colored particles coated with a polysiloxane modified with at least one kind selected from a polyether, a polyester, and an aralkyl. This inorganic colored particle powder can be obtained by mixing, at a temperature of >=80 deg.C, inorganic colored particles with the polysiloxane modified with at least one kind selected from the polyether, the polyester, and the aralkyl.
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公开(公告)号：JPH07192248A
公开(公告)日：1995-07-28
申请号：JP35355593
申请日：1993-12-27
Applicant: TODA KOGYO CORP
Inventor： HAYASHI KAZUYUKI , IWASAKI KEISUKE , TANAKA YASUYUKI , OSUGI MINORU , MORII HIROKO , SAKOTA MINEKO
Abstract: PURPOSE:To obtain a magnetic recording medium having a magnetic recording layer which consists of a thin film having low light transmissivity, good flatness and uniformity in thickness at the time of providing the magnetic recording layer on an undercoat layer. CONSTITUTION:This undercoat layer consisting of a coating film composition which contains a non-magnetic particle powder and a binder resin is formed on a non-magnetic substrate. The non-magnetic particle powder is produced as follows. An alkali aq. solution is added to an aq. liquid suspension contg. acicular alpha-Fe2O3 particles to adjust the pH value of the suspernsion to >=10, and then an aq. solution contg. Al and/or Si is added to this suspension. Subsequently, the pH of the resulting liquid suspension is adjusted to a nearly neutral value while stirring to rapidly precipitate hydroxide of Al and/or Si and thereafter the particles in the suspension is separated by filtration together with this hydroxide to obtain a mixture of the particles and the hydroxide. Then, this mixture is water washed and dried and the resulting mixture is subjected to compacting pulverization by using an edge runner to produce the objective non-magnetic particle powder consisting of the acicular alpha-Fe2O3 particles on the surface of which oxide or hydroxide of Al and/or Si is fixed.
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Patent Agency Ranking
公开(公告)号：JPH0945516A
公开(公告)日：1997-02-14
申请号：JP21108795
申请日：1995-07-26
Applicant: TODA KOGYO CORP
Inventor： KAMIGAKI MAMORU , SAKOTA MINEKO , HAYASHI KAZUYUKI , MORII HIROKO
Abstract: PROBLEM TO BE SOLVED: To provide a manufacturing method in which a magnetic particle powder whose dispersibility into water-base paint is excellent can be obtained industrially. SOLUTION: A magnetic particle powder ic composed of magnetic particles in which a polysiloxane modified by one or more kinds selected from a polyether, a polyester and an aralkyl are applied to the surface of the particles. The magnetic particle powder can be obtained in such a way that the magnetic particles and the polysiloxane which is modified by one or more kinds selected from polyeter, polyester and aralkyl are mixed at a temperature of 80 deg.C or higher.
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公开(公告)号：JPH09165531A
公开(公告)日：1997-06-24
申请号：JP34804795
申请日：1995-12-14
Applicant: TODA KOGYO CORP
Inventor： SAKOTA MINEKO , MORII HIROKO , HAYASHI KAZUYUKI , TSUNODA HIROSHI
Abstract: PROBLEM TO BE SOLVED: To produce the subject pigment excellent in dispersibility and heat resistance and having a small degree of the color tone difference before and after a heat resistance-improving process on an industrial scale at a low cost by treating yellow hydrated iron oxide particles according to a specific method. SOLUTION: Yellow hydrated iron oxide particles are treated under heating in an alkaline aqueous solution of >=10 of a pH-value, filtered and washed with water to reduce a soluble sulfate content below 2000ppm in terms of SO4 . Further, the particles are treated under heating in an acidic aqueous solution of =10 or
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公开(公告)号：JPH08120191A
公开(公告)日：1996-05-14
申请号：JP21532695
申请日：1995-07-31
Applicant: TODA KOGYO CORP
Inventor： HAYASHI KAZUYUKI , MORII HIROKO , SAKOTA MINEKO , OSUGI MINORU
Abstract: PURPOSE: To obtain the subject powder, comprising inorganic colored particles prepared by applying a specific modified polysiloxane to the surfaces of particles and excellent in easy dispersibility and dispersion stability in a vehicle and further storage stability and suitable as a water-based coating, etc. CONSTITUTION: This powder comprises inorganic colored particles prepared by applying (A) a modified polysiloxane modified with a polyether, a polyester or an aralkyl [e.g. the one of formula I 9146/28}R1 is a group of the formula (CH2 )1 [(l) is 1-15]; R2 is a group of (CH2 )m -CH3 [(m) is 0-15]; R3 is H, OH, COOH, etc.; R4 is H or R2 ; (q) is 1-15; (x) is 1-50; (y) is 1-300] or formula II 9146/28}R1 is a group of the formula (CH2 )l [(l) is 1-15]; R2 is H, OH, COOH, etc.; R3 is H or a group of the formula (CH2 )n -CH3 [(n) is 0-15]; (x) and (y) are each 1-500]] to the surfaces of particles.
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公开(公告)号：JPH08167517A
公开(公告)日：1996-06-25
申请号：JP33334994
申请日：1994-12-14
Applicant: TODA KOGYO CORP
Inventor： HAYASHI KAZUYUKI , MORII HIROKO , OSUGI MINORU , IWASAKI KEISUKE , TANAKA YASUYUKI , SAKOTA MINEKO
Abstract: PURPOSE: To provide a magnetic recording medium including a transparent magnetic recording layer having good magnetic characteristics and light transmissivity with small dependency on wavelength. CONSTITUTION: At 40 to 100 deg.C, a tin-chloride solution is added to a water dispersion solution of ph8 to 10 while the same potential of hydrogen is kept. In this case the dispersion solution contains magnetic powder of iron oxide particles. Then, a surface of the particle is coated with tin oxide or tin hydroxide to obtain magnetic powder of iron-oxide particles for a transparent magnetic recording layer. In a magnetic recording medium, a transparent magnetic recording layer is made up of bonding resin of 100 parts by weight and magnetic powder of iron-oxide particles of 0.1 to 100 parts, with saturation magnetic flux (Bm) of 3 to 600G, and transmissivity (T400) of 25 to 98% for light wavelength of 400nm. In addition, a ratio of transmissivity of light wavelength of 400nm to light wavelength of 700nm ranges from 0.70 to 0.98.
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公开(公告)号：JPH07315845A
公开(公告)日：1995-12-05
申请号：JP13501294
申请日：1994-05-24
Applicant: TODA KOGYO CORP
Inventor： HAYASHI KAZUYUKI , IWASAKI KEISUKE , TANAKA YASUYUKI , OSUGI MINORU , MORII HIROKO , SAKOTA MINEKO , MAEKAWA MASAAKI , SUGITA NORIO
Abstract: PURPOSE:To obtain the subject antiseismic substrate excellent in surface smoothness and mechanical strength by using granular non-magnetic BaO.4.5Fe2O3 powder. CONSTITUTION:This antiseismic non-magnetic substrate having the above- mentioned advantages is obtained by using non-magnetic granular powder consisting of BaO.4.5Fe2O3 non-magnetic granules prepared by sticking Al and/or Si hydroxide or oxide having both these elements onto the granule surface >=0.50 in the molecular weight-dependent parameter alpha in the relationship between polymer molecular weight (M) and saturated absorption (As): As=K1M [(a) means the molecular weight-dependent parameter alpha]. Specifically, the above non-magnetic powder is produced by the following processes: an aqueous alkaline solution is added to an aqueous suspension containing BaO.4.5Fe2O3 non- magnetic granules to bring the pH level of the suspension to >=10 followed by adding Al and/or Si compound(s) to the suspension to adjust its pH level to about 7 to rapidly precipitate Al and/or Si hydroxide or oxide, and this precipitate is washed and dried and then subjected to consolidated grinding.
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