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US 10,100,253 B2Granted
Method of preparing a birefringent polymer film
AssigneeMerck Patent GmbH
InventorsIain Gardiner, Owain Llyr Parri, Tara Perrett, Joseph Sargent, Jack Bradford, Sarah Whitehouse
Life of this patent
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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 electrooptical devices, for decorative or security applications, as alignment layer or optical retardation film.
Claims21
A method of preparing a polymer film comprising the following steps:
- a) providing a layer of a polymerisable liquid-crystalline material comprising at least one dichroic photoinitiator onto a substrate,
- b) irradiating the liquid-crystalline material in its isotropic phase with linear polarised light, wherein a polymerized film is formed that has uniform alignment, wherein the uniform alignment is a result of only the irradiation and the resulting polymer film exhibits uniform alignment, and
- c) optionally removing the polymerised film from the substrate.
A method of preparing a polymer film comprising the following steps:
- a) providing a layer of a polymerisable liquid-crystalline material comprising at least one dichroic photoinitiator onto a substrate, which substrate is not a rubbed plastic substrate and/or does not contain an alignment layer,
- b) irradiating the liquid-crystalline material in its isotropic phase with linear polarised light, wherein a polymerized film is formed that has uniform alignment, wherein the uniform alignment is a result of only the irradiation and the resulting polymer film exhibits uniform alignment, and
- c) optionally removing the polymerised film from the substrate.
Dependencies are inferred from the claim text.