Security document and method of producing it

US5820971A · kind A · utility

Assignee

• GIESECKE & DEVRIENT GMBH · DE

Inventors

• Wittich Kaule · Grafing, DE
• Gregor Grauvogl · Hersbruck, DE

Key dates

• Filing date: Oct 27, 1995
• Grant date: Oct 13, 1998
• Expiry date: Oct 27, 2015

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T428/31993
• WIPO field: Surface technology, coating
• WIPO sector: Chemistry

Abstract

A security document such as a bank note, identity card or the like, includes at least one multilayer security element made of at least two layers of reaction lacquer or adhesive between which diffraction structures, in particular holographic structures, exist in the form of a relief. A reflective layer is additionally disposed between the layers of lacquer. The reaction lacquer of adhesive is the type curable or cross-linkable under physical (e.g. radiation) and/or chemical activation.