公开(公告)号：EP3922606A1

公开(公告)日：2021-12-15

申请号：EP20753178.1

申请日：2020-02-04

Applicant: The University of Tokyo ,  DOWA Electronics Materials Co., Ltd.

Inventor： OHKOSHI, Shin-ichi ,  NAMAI, Asuka ,  YOSHIKIYO, Marie ,  KODAMA, Daisuke ,  OBATA, Shiho ,  GOTOH, Masahiro

IPC: C01G51/00 ,  C01G49/00 ,  H01F1/11

Abstract: [Object] To provide an iron-based oxide magnetic powder that has good thermal stability and a small change in coercive force even in a high-temperature environment and that is composed of particles of ε-iron oxide in which Fe sites are partially substituted by another metal element, and a production method for an iron-based oxide magnetic powder.
[Means for Solution] An iron-based oxide magnetic powder that has good thermal stability and a small change in coercive force even in a high-temperature environment and that is composed of particles of ε-iron oxide in which Fe sites are partially substituted by another metal element is obtained by allowing a phosphorus-containing ion to coexist when a precipitate of an iron hydroxide containing a substituent metal element produced by neutralizing an acidic aqueous solution containing a trivalent iron ion and an ion of a metal that partially substitutes Fe sites is coated with silicon oxide using a silane compound.

公开(公告)号：EP3594298A1

公开(公告)日：2020-01-15

申请号：EP18764199.8

申请日：2018-03-07

Applicant: DOWA Electronics Materials Co., Ltd.

Inventor： SATO, Kimitaka ,  KODAMA, Daisuke ,  KANASUGI, Minami ,  UEYAMA, Toshihiko ,  KURITA, Satoru

IPC: C09D11/52 ,  C09D5/24 ,  C09D7/40 ,  C09D201/00 ,  H01B1/00 ,  H01B1/22 ,  H01B5/14 ,  H01B13/00

Abstract: [Problem]
To provide a method for producing nanowires that has high industrial practicability and a conductive film that has high transparency and high conductivity.
[Solution]
A method for producing a silver nanowire ink, including mixing urethane resin particles having an average particle diameter of 200 nm or less, containing a urethane resin having a degree of elongation of less than 500%, with a silver nanowire dispersion liquid. The urethane resin may have an average value of 100% modulus (100% Mo), for example, of 6.0 MPa or more. The content of the urethane resin colloid or the urethane resin emulsion may be from 0.01 to 2.0% by mass based on the total amount of the silver nanowire ink. The content of silver is preferably from 0.01 to 2.0% by mass based on the total amount of the silver nanowire ink. The content of the viscosity modifier is preferably from 0.01 to 2.0% by mass based on the total amount of the silver nanowire ink.

公开(公告)号：EP3591016A1

公开(公告)日：2020-01-08

申请号：EP18761132.2

申请日：2018-02-27

Applicant: DOWA Electronics Materials Co., Ltd.

Inventor： SATO, Kimitaka ,  KODAMA, Daisuke ,  KURITA, Satoru

IPC: C09D11/52 ,  B22F1/02 ,  B22F9/00 ,  C08K7/06 ,  C08K9/04 ,  C08L1/28

Abstract: [Problem] To provide a silver nanowire ink that is capable of stably suppressing the decrease in conductivity of the silver nanowire conductive layer caused by coating a coating liquid for forming a transparent conductive layer.
[Solution] A silver nanowire ink containing a water soluble cellulose ether having a methoxy group, and silver nanowires, in an aqueous solvent, the water soluble cellulose ether having a mass proportion of a methoxy group of from 16.0 to 25.0%. Particularly preferred examples of the water soluble cellulose ether include HPMC having a mass proportion of a hydroxypropoxy group of 10.0% or less and HEMC having a mass proportion of a hydroxyethoxy group of 12.0% or less.

公开(公告)号：EP3937194A1

公开(公告)日：2022-01-12

申请号：EP20766384.0

申请日：2020-02-28

Applicant: DOWA Electronics Materials Co., Ltd.

Inventor： HORI, Tatsuro ,  KODAMA, Daisuke ,  OBATA, Shiho ,  GOTOH, Masahiro

IPC: H01F1/11 ,  B82Y25/00 ,  B82Y40/00 ,  C01G49/00 ,  C01G51/00 ,  G11B5/706 ,  G11B5/842 ,  H01F1/113

Abstract: [Problem] To provide a substitution-type ε-iron oxide magnetic particle powder in which the content of a nonmagnetic α-type iron-based oxide is reduced and the Fe sites of ε-Fe 2 O 3 are partially substituted by another metal element, and a method for producing a substitution-type ε-iron oxide magnetic particle powder.
[Means for Solution] A substitution-type ε-iron oxide magnetic particle powder in which the content of an α-type iron-based oxide is reduced is obtained by neutralizing an acidic aqueous solution containing a trivalent iron ion and an ion of a metal that partially substitutes Fe sites to a pH of 2.0 or higher and 7.0 or lower, and thereafter adding a silicon compound having a hydrolyzable group to a dispersion liquid containing an iron oxyhydroxide having a substituent metal element or a mixture of an iron oxyhydroxide and a hydroxide of a substituent metal element formed, and subsequently neutralizing the dispersion liquid to a pH of 8.0 or higher and then performing aging by holding the dispersion liquid, and coating the iron oxyhydroxide having a substituent metal element or the mixture of the iron oxyhydroxide and the hydroxide of a substituent metal element with a chemical reaction product of the silicon compound, followed by heating.

公开(公告)号：EP3950598A1

公开(公告)日：2022-02-09

申请号：EP20779567.5

申请日：2020-03-13

Applicant: DOWA Electronics Materials Co., Ltd.

Inventor： HORI, Tatsuro ,  KODAMA, Daisuke ,  OBATA, Shiho ,  GOTOH, Masahiro

IPC: C01G49/00 ,  H01F1/11 ,  H01F1/34 ,  H05K9/00

Abstract: [Problem] To provide a substituted ε-iron oxide magnetic particle powder in which the content of a non-magnetic α-type iron-based oxide is reduced and the Fe sites of ε-Fe 2 O 3 are partially substituted by another metal element, and a production method for a substituted ε-iron oxide magnetic particle powder.
[Means for Solution] A substituted ε-iron oxide magnetic particle powder in which the content of an α-type iron-based oxide is reduced is obtained by neutralizing an acidic aqueous solution containing a trivalent iron ion and an ion of a metal that partially substitutes Fe sites to a pH of 2.0 or higher and 7.0 or lower, and thereafter adding a silicon compound having a hydrolyzable group to a dispersion liquid containing an iron oxyhydroxide having a substituent metal element or a mixture of an iron oxyhydroxide and a hydroxide of a substituent metal element formed, and subsequently neutralizing the dispersion liquid to a pH of 8.0 or higher and then performing aging by holding the dispersion liquid, and coating the iron oxyhydroxide having a substituent metal element or the mixture of the iron oxyhydroxide and the hydroxide of a substituent metal element with a chemical reaction product of the silicon compound, followed by heating.