Title:
LIGHT-COLORED MAGNETIC PARTICLES HAVING IMPROVED DURABILITY AND CHEMICAL RESISTANCE
Document Type and Number:
WIPO Patent Application WO/2019/132232
Kind Code:
A1
Abstract:
The present invention can provide light-colored magnetic particles having a zirconium oxide coating layer formed on a magnetic core, and having a silver coating layer formed on the zirconium oxide coating layer, and a part of the surface of the zirconium oxide coating layer is exposed to the outside, but chemical resistance is excellent, and thus the magnetic particles hardly cause a change of magnetic characteristics so as to be suitable for security elements.
Inventors:
KIM HONG KEON (KR)
CHOE WON GYUN (KR)
KIM SU DONG (KR)
KIM HYUN SOO (KR)
KIM E DEN (KR)
CHOI HYE JUN (KR)
KANG JU HEE (KR)
CHOE WON GYUN (KR)
KIM SU DONG (KR)
KIM HYUN SOO (KR)
KIM E DEN (KR)
CHOI HYE JUN (KR)
KANG JU HEE (KR)
Application Number:
PCT/KR2018/013521
Publication Date:
July 04, 2019
Filing Date:
November 08, 2018
Export Citation:
Assignee:
KOREA MINTING SECURITY PRINTING ＆ ID CARD OPERATING CORP (KR)
International Classes:
H01F3/02; B22F1/052; B22F1/16; B22F1/17; B42D25/29; B42D25/369; C09D5/23; C09D11/03; H01F1/01
Foreign References:
| KR101718505B1 | 2017-03-22 | |||
| KR20130043410A | 2013-04-30 | |||
| KR20060028393A | 2006-03-29 | |||
| KR100581456B1 | 2006-05-23 | |||
| JPH08138921A | 1996-05-31 | |||
| KR20060028393A | 2006-03-29 |
Other References:
See also references of EP 3734624A4
Attorney, Agent or Firm:
PLUS INTERNATIONAL IP LAW FIRM (KR)
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