Patent ID: 7887892

Claim:
A method for producing a liquid crystal material, characterised in that it comprises the following steps consisting in: applying a first treatment to the liquid crystal mixture having a helical structure comprising a first non-photoreactive liquid crystal (A) and a second photoreactive second liquid crystal (B), said first treatment modifying a handedness of the helix of the mixture, wherein said first treatment comprises application of a thermal treatment, a UV irradiation, an electric field or a magnetic field; applying a second treatment to the mixture such that the second liquid crystal (B) forms a polymer network, the second treatment being performed during all or part of the first treatment such that the liquid crystal material keeps a memory of the modifications to the helix and that the material has its entire volume both a right-handed and left-handed helical structure, wherein said second treatment comprises UV irradiation to polymerise the mixture or a quenching for vitrifying the mixture.