公开(公告)号：US12208447B2

公开(公告)日：2025-01-28

申请号：US17288207

申请日：2019-10-21

Applicant: BASF SE

Inventor： Nikolay A. Grigorenko ,  Andre Oswald ,  Michelle Richert

IPC: B42D25/373 ,  B22F1/00 ,  B22F1/052 ,  B22F1/054 ,  B22F1/0545 ,  B22F1/07 ,  B22F1/102 ,  B22F9/24 ,  B41M3/14 ,  B42D25/391 ,  C08K3/08 ,  C09D7/63 ,  B82Y30/00 ,  B82Y40/00 ,  C09D5/29 ,  C09D11/037

Abstract: The present invention relates to compositions, comprising silver nanoplatelets, wherein the mean diameter of the silver nanoplatelets, present in the composition, is in the range of 20 to 70 nm with standard deviation being less than 50% and the mean thickness of the silver nanoplatelets, present in the composition, is in the range of 5 to 30 nm with standard deviation being less than 50%, wherein the mean aspect ratio of the silver nanoplatelets is higher than 1.5, a process for its production, printing inks containing the compositions and their use in security products. The highest wavelength absorption maximum of the population of all silver nanoplatelets in the composition being within the range of 450 to 550 nm. A coating, comprising the composition, shows a red, or magenta color in transmission and a greenish-metallic color in reflection.