Security document and/or document of value containing a visually changeable window with a hologram

Patent metadata

Field	Value
Publication number	US-9658595-B2
Application number	US-201314422768-A
Country	US
Kind code	B2
Filing date	Aug 15, 2013
Priority date	Aug 23, 2012
Publication date	May 23, 2017
Grant date	May 23, 2017

Abstract

The present invention relates to a security document and/or document of value with a hologram in a visually changeable window as a novel security element, and also to a method for producing the same.

First claim

The invention claimed is:

1. A hot laminated document of security and/or value, comprising at least one window, the window being formed from a multilayer assembly, wherein the multilayer assembly comprises
at least one layer (P) comprising at least one photopolymer prepared from a photopolymer formulation comprising a polyol component, a polyisocyanate component, a writing monomer and a photoinitiator and incorporating at least one volume hologram (H) and
at least one transparent, optically switchable layer (O) which becomes non-transparent by means of heat or irradiation, wherein the transparent, optically switchable layer (O) is a layer of at least of at least one transparent thermoplastic polyurethane comprising at least one photochromic or thermochromic material or composition.

2. The hot laminated document of security and/or value as claimed in claim 1 , wherein the photopolymer formulation further comprises an additive, preferably an additive according to the general formula (III)

in which m≧1 and m≦8 and R 3 , R 4 and R 5 independently of one another are hydrogen or are linear, branched, cyclic or heterocyclic organic radicals which are unsubstituted or else optionally substituted by heteroatoms, at least one of the radicals R 3 , R 4 and R 5 preferably being substituted by at least one fluorine atom, and R 3 more preferably being an organic radical having at least one fluorine atom.

3. The hot laminated document of security and/or value as claimed in claim 1 , wherein the writing monomer in the photopolymer formulation comprises at least one monofunctional and/or one multifunctional urethane (meth)acrylate.

4. The hot laminated document of security and/or value as claimed in claim 1 , wherein it is a document of identification, preferably an ID card.

5. The hot laminated document of security and/or value as claimed in claim 1 , wherein the window is incorporated in the document of security and/or value in such a way that the remaining inner part of the document and the window are located between at least two transparent outer layers which comprise at least one thermoplastic and which two-dimensionally each cover the entire document.

6. The hot laminated document of security and/or value as claimed in claim 5 , wherein the outer layers comprising at least one thermoplastic and the further transparent layers comprising at least one thermoplastic in the multilayer assembly of the window are layers comprising at least one polycarbonate or copolycarbonate.

7. The hot laminated document of security and/or value as claimed in claim 1 , wherein the window comprises at least one further transparent layer which comprises at least one thermoplastic and is located on the side of the layer P that is remote from the layer O.

8. The hot laminated document of security and/or value as claimed in claim 1 , wherein the window comprises at least two further transparent layers comprising at least one thermoplastic, of which one is located on the side of the layer P that is remote from the layer O and the other is located on the side of the layer O that is remote from the layer P.

9. The hot laminated document of security and/or value as claimed in claim 1 , wherein the hologram in one state is poorly visible, and the window is virtually transparent, and wherein, in another state, the hologram is clearly apparent.

10. A method for producing a hot laminated document of security and/or value as claimed in claim 1 , comprising
a) incorporating a recess into a single- or multilayer base body for a document of security and/or value,
b) incorporating into the recess a multilayer assembly which is trimmed to match the recess and comprises
at least one layer (P) comprising at least one photopolymer and incorporating at least one volume hologram (H), and
at least one transparent, optically switchable layer (O) which becomes non-transparent by means of heat or irradiation,

c) using heat and pressure placing the arrangement according to b) between at least two transparent films which two-dimensionally are of at least equal size and comprise at least one thermoplastic, and
d) laminating the arrangement obtained according to c).

11. The method as claimed in claim 10 , wherein the multilayer assembly incorporated into the recess in b) further comprises at least one further transparent layer (S) comprising at least one thermoplastic, and is produced by
from a photopolymer formulation, applying the layer (P) to a substrate film which forms the layer (S)
incorporating the volume hologram (H) into this layer (P)
subsequently placing a polymeric film onto the layer (P), for producing the layer (O)
optionally placing a further transparent polymeric film onto the polymeric film for producing the layer (O), for producing a further transparent layer
laminating the resulting film stack using heat and pressure to form a multilayer assembly and

subsequently, from the laminate, punching or cutting out a part matching the recess.

12. A hot laminated document of security and/or value, comprising at least one window, the window being formed from a multilayer assembly, wherein the multilayer assembly consists of
a layer (P) comprising at least one photopolymer prepared from a photopolymer formulation comprising a polyol component, a polyisocyanate component, a writing monomer and a photoinitiator and incorporating at least one volume hologram (H) and
a transparent, optically switchable layer (O) which becomes non-transparent by means of heat or irradiation, wherein the transparent, optically switchable layer (O) is a layer of at least of at least one transparent thermoplastic polyurethane comprising at least one photochromic or thermochromic material or composition,
a transparent thermoplastic polyurethane film (K), which is located on the side of the layer (P) that is remote from the layer (O), and optionally a further transparent thermoplastic polyurethane film (K), which is located on the side of the layer (O) that is remote from the layer (P),

two transparent outer layers (D),
and a white core layer (W) having a recess, and wherein the multilayer assembly is disposed within the recess, and
wherein the window is incorporated in the document of security and/or value in such a way that the remaining inner part of the document and the window are located between the two transparent outer layers (D) which comprise at least one thermoplastic and which two-dimensionally each cover the entire document.

13. The hot laminated document of security and/or value as claimed in claim 12 having a thickness of from 500 μm to 1000 μm.

Assignees

• Bayer Materialscience Ag
• Covestro Deutschland Ag

Inventors

• Tziovaras Georgios
• Pudleiner Heinz
• Planken Kira
• Janke Stefan
• Weiser Marc-Stephan
• Fäcke Thomas

Classifications

• G03H1/0256

  having specific functional layer · CPC title

• Y10T156/10

  Methods of surface bonding and/or assembly therefor · CPC title

• G03H2001/0016

  Covert holograms or holobjects requiring additional knowledge to be perceived, e.g. holobject reconstructed only under IR illumination · CPC title

• B32B2307/416

  Reflective · CPC title

• G03H2250/37

  Enclosing the photosensitive material · CPC title