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    ALNICO-BASED MAGNETIC PARTICLES FOR SECURITY INK
    1.
    发明公开
    ALNICO-BASED MAGNETIC PARTICLES FOR SECURITY INK 审中-公开

    公开(公告)号：EP3712910A1

    公开(公告)日：2020-09-23

    申请号：EP18879052.1

    申请日：2018-11-08

    申请人： Korea Minting, Security Printing & ID Card Operating Corp.

    发明人： CHOE, Won Gyun ,  KIM, Su Dong ,  KIM, Hong Keon ,  KANG, Ju Hee ,  KIM, Hyun Soo ,  KIM, E Den

    IPC分类号： H01F1/20 ,  H01F3/08 ,  C09D11/03 ,  B42D25/369

    摘要： 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 D 50 of smaller than 12 µm, D 50 being 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: 10 ≤ UNF Al 10 ≤ UNF Ni 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.