Title:
PROCESS FOR PRODUCING POLYMER-COATED FERROMAGNETIC PARTICLE, AND POLYMER-COATED FERROMAGNETIC PARTICLE
Document Type and Number:
WIPO Patent Application WO/2007/110917
Kind Code:
A1
Abstract:
Polymer-coated ferromagnetism attained through solving of the problem that because ferromagnetic fine particles tend to aggregate, it is difficult to obtain polymer-coated ferromagnetism resulting from dispersion to a state close to monodispersion and polymer coating. A hydrophobizing substance is adsorbed on hydrophilic ferromagnetic particles to thereby attain hydrophobization. By the use of a surfactant having a nonionic hydrophilic group therein, the ionic strength is suppressed to thereby attain hydrophilization and obtain a dispersion. In the emulsification of monomer liquid, use is made of a nonionic surfactant and an ionic surfactant. The dispersion and the emulsion are mixed together, and an emulsion polymerization is carried out. Thus, a homogeneous stable polymer coating is provided on the well dispersed ferromagnetic particles, thereby obtaining polymer-coated ferromagnetic particles that excel in response to any magnetic field.
Inventors:
HANDA HIROSHI (JP)
NISHIO KOSUKE (JP)
GOKON NOBUYUKI (JP)
ABE MASANORI (JP)
NISHIO KOSUKE (JP)
GOKON NOBUYUKI (JP)
ABE MASANORI (JP)
Application Number:
PCT/JP2006/306197
Publication Date:
October 04, 2007
Filing Date:
March 27, 2006
Export Citation:
Assignee:
CIRCLE PROMOTION SCIENCE & ENG (JP)
HANDA HIROSHI (JP)
NISHIO KOSUKE (JP)
GOKON NOBUYUKI (JP)
ABE MASANORI (JP)
HANDA HIROSHI (JP)
NISHIO KOSUKE (JP)
GOKON NOBUYUKI (JP)
ABE MASANORI (JP)
International Classes:
C08F2/24; C08F2/44; C08F12/06; C08F12/36; C08F20/32; C08K3/22; C08L57/00
Domestic Patent References:
| WO2003066644A1 | 2003-08-14 |
Foreign References:
| JP2005200643A | 2005-07-28 | |||
| JPH02286729A | 1990-11-26 | |||
| JP2006088131A | 2006-04-06 | |||
| JPH11191510A | 1999-07-13 | |||
| JPH06102708A | 1994-04-15 | |||
| JP2002090366A | 2002-03-27 | |||
| JP2003513093A | 2003-04-08 | |||
| JP2005200643A | 2005-07-28 | |||
| EP0390634A1 | 1990-10-03 | |||
| EP0038730A1 | 1981-10-28 | |||
| EP0054832A1 | 1982-06-30 |
Other References:
See also references of EP 2000484A4
SUN S. ET AL., J. AM. CHEM. SOC., vol. 126, no. 1, 2004, pages 273 - 279
JONGNAM P ET AL., NATURE MATER., vol. 3, 2004, pages 891 - 895
SUN S. ET AL., J. AM. CHEM. SOC., vol. 126, no. 1, 2004, pages 273 - 279
JONGNAM P ET AL., NATURE MATER., vol. 3, 2004, pages 891 - 895
Attorney, Agent or Firm:
SUYAMA, Saichi (1 Kandata-cho 2-chome, Chiyoda-ku Tokyo 46, JP)
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