Patent · US Active

Film comprising a polymer layer

US7862880B2 · kind B2 · utility

3Cited by

6References

28Claims

0Family size

Assignee

LEONHARD KURZ Stiftung & Co. KG · DE

Inventors

Haymo Katschorek · Herzogenaurach, DE
Andreas Schilling · Hagendorn, CH
Mathias Seitz · Buckenhof, DE

Key dates

Filing date	Apr 13, 2005
Grant date	Jan 4, 2011
Priority date	—
Expiry date	Nov 20, 2027

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY10T428/24612
WIPO fieldOther consumer goods
WIPO sectorOther fields

Abstract

The invention concerns a film, in particular a stamping film, laminating film or sticker film, which has at least one anisotropic polymer layer of an at least partially oriented liquid crystal material. The anisotropic polymer layer has one or more first regions which form a first security feature and in which the anisotropic polymer layer has properties which linearly polarise or which rotate the direction of rotation, and one or more second regions which form a second security element and in which the anisotropic polymer layer has circularly polarising properties. The first security feature is visualised when viewed through a first polariser and the second security feature is visualised when viewed through a second polariser responsive to a different polarisation state from that of the first polariser.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.