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Title:
ALNICO-BASED MAGNETIC PARTICLES FOR SECURITY INK
Document Type and Number:
WIPO Patent Application WO/2019/098599
Kind Code:
A1
Abstract:
AlNiCo-based magnetic particles according to the present invention are hard magnetic particles each comprising: a core particle containing Al, Ni, and Co; and an inorganic shell enclosing the core particle, wherein the core particle is an ultra-fine particle having D50 of smaller than 12 μm, D50 being the particle size corresponding to 50% in the core particle diameter cumulative distribution, and wherein the core particle has a composition uniformity of equation 1, equation 2, and equation 3 below: Equation 1: 10 ≤ UNF(Al), Equation 2: 10 ≤ UNF(Ni), and Equation 3: 10 ≤ UNF(Co). In equation 1, UNF(Al) is the value obtained by dividing the average Al composition among core particles by the standard deviation of the Al composition on the basis of weight% of the composition. In equation 2, UNF(Ni) is the value obtained by dividing the average Ni composition among core particles by the standard deviation of the Ni composition on the basis of weight% of the composition. In equation 3, UNF(Co) is the value obtained by dividing the average Co composition among core particles by the standard deviation of the Co composition on the basis of weight% of the composition.

Inventors:
CHOE, Won Gyun (#103-601, 39 World Cup-daero 290beon-gil,Yuseong-Gu, Daejeon, 34198, KR)
KIM, Su Dong (#112-1503, 300 Munji-ro,Yuseong-Gu, Daejeon, 34050, KR)
KIM, Hong Keon (#409-1701, 32 Noeunseo-ro 210beon-gil,Yuseong-Gu, Daejeon, 34082, KR)
KANG, Ju Hee (#104-1504, 9 Gyeryong-ro 536beon-gil,Seo-Gu, Daejeon, 35268, KR)
KIM, Hyun Soo (#506, 51 Oncheonbuk-Ro,Yuseong-Gu, Daejeon, 34185, KR)
KIM, E Den (24 Hwaun-ro 304beon-gil, Seo-Gu, Gwangju, 61915, KR)
Application Number:
KR2018/013518
Publication Date:
May 23, 2019
Filing Date:
November 08, 2018
Export Citation:
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Assignee:
KOREA MINTING, SECURITY PRINTING & ID CARD OPERATING CORP. (80-67, Gwahak-roYuseong-Gu, Daejeon, 34132, KR)
International Classes:
H01F1/20; B42D25/369; C09D11/03; H01F3/08
Foreign References:
KR20170078023A2017-07-07
JP2016523794A2016-08-12
KR20170032710A2017-03-23
KR100744351B12007-07-24
KR20150116841A2015-10-16
Attorney, Agent or Firm:
PLUS INTERNATIONAL IP LAW FIRM (10F 809, Hanbat-daeroSeo-Gu, Daejeon, 35209, KR)
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