METHOD FOR MAKING FLAKES
    6.
    发明公开

    公开(公告)号:US20230141815A1

    公开(公告)日:2023-05-11

    申请号:US17907560

    申请日:2021-04-01

    摘要: A method is disclosed for producing flakes of a first material, the method comprising: a) supporting two supply cylinders of the first material and a fatiguing rod assembly, that includes at least one textured fatiguing rod, so that each fatiguing rod is sandwiched between the two cylinders, each fatiguing rod having a diameter smaller than an initial diameter of the two supply cylinders and being made of a second harder material; b) urging the surfaces of the two supply cylinders into contact with each fatiguing rod; and c) causing the supply cylinders and the fatiguing rod(s) to rotate while making rolling line contact with one another; wherein the supply cylinders and each fatiguing rod are urged against one another with sufficiently high contact pressure to modify the surface of the supply cylinders by fatigue and result in separation of flakes from the surfaces of the cylinders.

    COMPOSITIONS, COMPRISING PLATELET-SHAPED TRANSITION METAL PARTICLES

    公开(公告)号:US20230241675A1

    公开(公告)日:2023-08-03

    申请号:US17918918

    申请日:2021-04-16

    申请人: BASF SE

    摘要: The present invention relates to compositions, comprising platelet-shaped transition metal particles, wherein the number mean diameter of the platelet-shaped transition metal particles, present in the composition, is in the range of 15 nm to 1000 nm and the number mean thickness of the platelet-shaped transition metal particles, present in the composition, is in the range of 2 to 40 nm, the transition metal is selected from silver, copper, gold and palladium and the platelet-shaped transition metal particles bear a surface modifying agent of formula A-(CHR9)r—R10 (V), wherein if r is 1, A is a C1-C25alkyl group substituted with one, or more fluorine atoms; a C2-C25alkenyl substituted with one, or more fluorine atoms; a C2-C25alkynyl group substituted with one, or more fluorine atoms; a C3-C20cycloalkyl group substituted with one, or more fluorine atoms; or a C6-C24aryl group substituted with one, or more fluorine atoms, CF3 or —O—CF3 groups; if r is 0, A is a C6-C24aryl group substituted with one, or more fluorine atoms, CF3 or —O—CF3 groups; or a C7-C24aralkyl group substituted with one, or more fluorine atoms, CF3 or —O—CF3 groups;
    R9 is H, or a C1-C4alkyl group; and R10 is a thiol group, or an amino group.
    Surface modification with fluorinated thiols/amines allows to tune the surface properties of silver nanoplatelets in such a way, as to, on the one hand, make them dispersible and colloidally stable in the finished printing ink system, and on the other hand, allow them to migrate to the substrate and print surfaces upon drying of the solvent in the printed layer.