Microparticle composition comprising an organic IR absorbing pigment

US12378424B2 · kind B2 · utility

Assignee

• BASF SE

Inventors

• Roland Hinrich Staff · Guntersblum, DE
• Yannick Fuchs · Ingelfingen, DE
• Helmut Reichelt · Neustadt, DE
• Hans Reichert · Rheinfelden (Baden), DE
• Oliver Seeger · Mannheim, DE
• Korinna Dormann · Bad Dürkheim, DE
• Bernd Dieter OSCHMANN · Ludwigshafen am Rhein, DE

Key dates

• Filing date: Oct 17, 2019
• Grant date: Aug 5, 2025
• Expiry date: Nov 8, 2042

Classification

• Technology area (CPC G): Physics
• CPC primary: G07D7/1205
• WIPO field: Basic materials chemistry
• WIPO sector: Chemistry

Abstract

The present invention relates to microparticle compositions comprising an organic IR absorbing pigment having a main absorption maximum in the range from 750 to 1100 nm. The invention also relates to a process for producing said microparticle compositions and to their use in a printing ink, in particular in a printing ink, which is suitable for producing a security feature or a security document. The microparticles of the pigment composition contain the organic IR absorbing pigment as solid particles, which are surrounded by or embedded in an aminoplast polymer, which is a polycondensation product of one or more amino compounds and one or more aldehydes. The microparticle based pigment composition is characterized by a volume based particle size distribution, as determined by static light scattering according to ISO 13320:2009 EN, having a D(4,3) value in the range from 1.0 to 15.0 μm.