Title:
SECURITY ELEMENT WITH A COLOR SHIFT TILT EFFECT
Document Type and Number:
WIPO Patent Application WO2006002756
Kind Code:
A3
Abstract:
The invention relates to a security element for security papers, valuable documents and the like with a thin-layer element (22) with a color shift tilt effect, comprising a reflecting layer (26), an absorbing layer (28) and a spacer layer (24), which is placed between the reflecting layer (26) and the absorbing layer (28). According to the invention, the spacer layer is formed by an ultra-thin film (24) with a thickness of less than 1.0 µm. This film (24) can be a drawn polyester film, e.g. a monoaxially, sequentially biaxially or simultaneously biaxially drawn polyalkylene terephthalate film or can be a biaxially drawn polyalkylene terephthalate film. The thin-layer element can be placed on a support while being stretched in areas in order to compensate for variations in thickness in the unstretched film.
Inventors:
HEIM MANFRED (DE)
Application Number:
PCT/EP2005/006378
Publication Date:
August 10, 2006
Filing Date:
June 15, 2005
Export Citation:
Assignee:
GIESECKE & DEVRIENT GMBH (DE)
HEIM MANFRED (DE)
HEIM MANFRED (DE)
International Classes:
B42D15/00
Domestic Patent References:
| WO2003068525A1 | 2003-08-21 |
Foreign References:
| EP0395410A2 | 1990-10-31 | |||
| US20030207113A1 | 2003-11-06 | |||
| DE10208036A1 | 2003-08-21 | |||
| EP0257835A1 | 1988-03-02 | |||
| US6045894A | 2000-04-04 | |||
| EP1407896A1 | 2004-04-14 |
Other References:
KIRK-OTHMER: "ENCYCLOPEDIA OF CHEMICAL TECHNOLOGY, VOL. 18", 1982, JOHN WILEY & SONS, NEW YORK, XP002373678
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