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US 9,663,718 B2Granted
Method of preparing a birefringent polymer film
AssigneeMerck Patent GmbH
InventorsGraham Smith, Owain Llyr Parri, Sarah Whitehouse, Tara Perrett
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Abstract
The invention relates to a method of preparing a polymer film and to the use of such polymer film as in liquid crystal displays (LCDs) or other optical or electro optical devices, for decorative or security applications, as alignment layer or optical retardation film.
Claims20
A method of preparing a patterned polymer film comprising:
- a) providing a layer of a polymerizable liquid-crystalline material comprising at least one dichroic photoinitiator, and at least one chiral compound, onto a substrate,
- b) adjusting the temperature of the polymerizable liquid-crystalline material to a temperature, where the polymerizable liquid-crystalline material is in its nematic or isotropic phase,
- c) polymerizing and orientating by irradiating the polymerizable liquid-crystalline material with linear polarized actinic radiation, varying the angle between the layer of the polymerizable liquid-crystalline material or the direction of the electric field vector of the linear polarized actinic radiation, thereby causing the polymerizable liquid-crystalline material to form a polymer film, and
- d) optionally removing the polymer film from the substrate.
1 more element
Dependencies are inferred from the claim text.