Chiral liquid crystal polymer layer or pattern comprising randomly distributed craters therein
AssigneeSicpa Holding SA
InventorsTristan JAUZEIN, Brahim KERKAR
Life of this patent
Estimating the term…
Abstract
Described is a chiral liquid crystal polymer (CLCP) layer or pattern which comprises randomly distributed craters of controlled mean diameter and/or density. The density and/or mean diameter of the craters can be controlled, for example, by adjusting the wetting of a substrate by a CLCP precursor composition, the development time of the precursor composition, and the thickness of the applied precursor composition.
Claims40
A chiral liquid crystal polymer (CLCP) layer or pattern, said CLCP layer or pattern comprising randomly distributed craters of controlled mean diameter and/or controlled density.
4-10. (canceled)
(canceled)
(canceled)
36-38. (canceled)
A method of forming a chiral liquid crystal polymer (CLCP) layer or pattern comprising applying a CLCP precursor composition onto a substrate in the form of a layer or pattern, optionally heating the applied composition to promote the chiral liquid crystal state thereof, and curing the CLCP precursor composition to form the layer or pattern on the substrate, wherein the applying the CLCP precursor composition onto the substrate results in the random formation of craters in at least a part of the CLCP layer or pattern, the mean diameter and/or the density of randomly distributed craters formed in the CLCP layer or pattern being controlled by controlling at least one parameter selected from one or more of the degree of wetting of the substrate by the CLCP precursor composition, the length of the time period elapsing between the application and the curing of the CLCP precursor composition, the thickness of the applied layer or pattern of the CLCP precursor composition, the viscosity of the CLCP precursor composition, and the method of applying the CLCP precursor composition onto the substrate.
A marking comprising a chiral liquid crystal polymer (CLCP) layer or pattern, the CLCP polymer layer or pattern comprising randomly distributed craters of controlled mean diameter and/or controlled density permitting identification of the marking.
A marking comprising a chiral liquid crystal polymer (CLCP) layer or pattern, the CLCP polymer layer or pattern comprising randomly distributed craters, the craters having a mean diameter of from 5 μm to 1000 μm, and in at least one area of the layer or pattern, the average number of craters per cm2 of layer or pattern is from 1 to 500.
(canceled)
48-50. (canceled)
Dependencies are inferred from the claim text.