Cholesteric layered material, and the production thereof

Details Cholesteric layered material, and the production thereof Cholesteric layered material, and the production thereof

2002-11-01

2003-12-02

Huff, Mark F. (Department: 1756)

Stock material or miscellaneous articles

Liquid crystal optical display having layer of specified...

Alignment layer of specified composition

C428S001100, C252S299010

Reexamination Certificate

active

06656543

ABSTRACT:

The present invention relates to cholesteric layered material, to multilayered cholesteric effect pigments, to a process for the production thereof, and to the use thereof.
Cholesteric layered material having the layer sequence A
1
/B/A
2
, where A
1
and A
2
are identical or different and each include at least one cholesteric layer, and B is at least one interlayer separating the layers A
1
and A
2
from one another, and cholesteric multilayered pigments having a corresponding structure are disclosed in DE-A-197 38 368.8, DE-A-197 38 369.6, DE-A-197 57 699.0 and PCT/EP98/05544 and PCT/EP98/05545. The disclosure content of these applications is expressly incorporated herein by way of reference.
It is an object of the present invention to provide cholesteric layered structures having a similar structure which can be produced by lamination.
We have found that this object is achieved by the provision of cholesteric layered material of the type described at the outset, having the layer sequence A
1
/B/A
2
, where A
1
and A
2
are identical or different and each include at least one cholesteric layer, and B is at least one interlayer separating the layers A
1
and A
2
from one another, where B preferably absorbs all or some of the light transmitted by the layers A
1
and A
2
, and the layer B is an adhesive layer.


REFERENCES:
patent: 5798147 (1998-08-01), Beck et al.
patent: 6103323 (2000-08-01), Motomura et al.
patent: 6143379 (2000-11-01), Schoenfeld et al.
patent: 197 15 993 (1998-10-01), None
patent: 197 38 368 (1999-03-01), None
patent: 197 38 369 (1999-03-01), None
patent: 197 57 699 (1999-06-01), None
patent: 0 872 336 (1998-10-01), None
patent: 9-133810 (1997-05-01), None
patent: WO 99/11719 (1999-03-01), None
patent: WO 99/11733 (1999-03-01), None
Translation of Japanese reference “Motomura”.

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