US 12,290,579 B2
Effect pigments having a reflective core and semiconductor layers
Devin Schmitt, Munster, IN (US); and Jonglak Choi, Munster, IN (US)
Assigned to ECKART AMERICA CORPORATION, Painesville, OH (US)
Appl. No. 18/720,721
Filed by ECKART AMERICA CORPORATION, Painesville, OH (US)
PCT Filed Dec. 6, 2022, PCT No. PCT/IB2022/061830
§ 371(c)(1), (2) Date Jun. 17, 2024,
PCT Pub. No. WO2023/119035, PCT Pub. Date Jun. 29, 2023.
Claims priority of application No. 21216793 (EP), filed on Dec. 22, 2021.
Prior Publication US 2025/0049650 A1, Feb. 13, 2025
This patent is subject to a terminal disclaimer.
Int. Cl. A61K 8/02 (2006.01); A61K 8/25 (2006.01); A61K 8/26 (2006.01); C09C 1/00 (2006.01); C09C 1/64 (2006.01)
CPC A61K 8/0262 (2013.01) [A61K 8/25 (2013.01); A61K 8/26 (2013.01); C09C 1/0021 (2013.01); C09C 1/642 (2013.01); C09C 2200/107 (2013.01); C09C 2200/301 (2013.01); C09C 2200/302 (2013.01); C09C 2200/401 (2013.01); C09C 2200/407 (2013.01)] 19 Claims
 
1. An effect pigment having a layer stack which comprises a highly reflective metallic flake having a first major interface and opposed to this first interface a second major interface, and at least one side surface and directly adjacent on one or of both of these major interfaces a layer of a semiconducting material having an average atomic composition of:
a) Si(1-x)Snx, wherein 0<x<0.90 or
b) Ge(1-y)Sny, wherein 0<y≤0.80 or
c) Si(1-m-n)GemSnn, wherein 0<m<1.00, 0<n<1.00 and with the proviso that m+n<1.00.