Polymerisable liquid crystal material and polymerised liquid crystal film
AssigneeMerck Patent GmbH
InventorsJin-Soon Park, Hoo-Yong Lee, Hyun-Jin Yoon, Heui-Seok Jin
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Abstract
A polymerisable LC material comprising one or more di- or multireactive mesogenic compounds and one or more compounds of formula UVI, and one or more compounds of formula UVII, Further, a method for its preparation, a polymer film with improved thermal durability and UV stability obtainable from a corresponding polymerisable LC material, a method of preparation of such polymer film, and the use of such polymer film and said polymerisable LC material for optical, electro-optical, decorative or security devices.
Claims18
A polymerizable LC material, comprising at least one di- or multireactive mesogenic compound and one or more compounds of formula UVII,
- wherein the individual radicals have the following meanings:
- R1 to R5 are each independently selected from the group consisting of H, alkyl, —OH, alkylaryl, alkylheteroaryl, cycloalkyl, cycloheteroalkyl, alkenyl, aryl and —SO3H, and
- R6 and R7 denote each and independently a hydrogen atom, a hydroxy group, or a halogen atom;
- and
- one or more compounds of formula UVI-a:
A process for the preparation of a polymerisable LC material, comprising the steps of mixing one or more compounds of formula UVI-a with at least one di- or multireactive mesogenic compound,
A process for the preparation of a polymer film, comprising the steps of:
- providing a layer of a polymerisable LC material comprising at least one di- or multireactive mesogenic compound and one or more compounds of formula UVI-a,
- and
- one or more compounds of formula UVII,
- wherein the individual radicals have the following meanings:
- R1 to R5 are each independently selected from the group consisting of H, alkyl, —OH, alkylaryl, alkylheteroaryl, cycloalkyl, cycloheteroalkyl, alkenyl, aryl and —SO3H, and
- R6 and R7 denote each and independently a hydrogen atom, a hydroxy group, or a halogen atom onto a substrate, photopolymerising the polymerisable LC material, and optionally removing the polymerised LC material from the substrate and/or optionally providing it onto another substrate.
A polymer film obtainable from a polymerisable LC material comprising at least one di- or multireactive mesogenic compound and one or more compounds of formula UVI-a,
- and
- one or more compounds of formula UVII,
- wherein the individual radicals have the following meanings:
- R1 to R5 are each independently selected from the group consisting of H, alkyl, —OH, alkylaryl, alkylheteroaryl, cycloalkyl, cycloheteroalkyl, alkenyl, aryl and —SO3H, and
- R6 and R7 denote each and independently a hydrogen atom, a hydroxy group, or a halogen atom by a process comprising the steps of providing a layer of the polymerisable LC material onto a substrate, photopolymerising the LC material, and optionally, removing the polymerised LC material from the substrate and/or optionally providing it onto another substrate.
Dependencies are inferred from the claim text.