Polymerizable liquid crystal material and polymerized liquid crystal film
AssigneeMerck Patent GmbH
InventorsStephen Mulcahy, Owain Llyr Parri, Sarabjot Kaur
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Abstract
A polymerizable LC material comprising one or more reactive mesogenic compounds, one or more chiral compounds and a block copolymer that comprises at least one polyfluorooxetane block bonded to a polyether block, said polyfluorooxetane block having a repeating unit of the formula Further, a method for its preparation, a polymer film obtainable from a corresponding polymerizable LC material, a method of preparation of such polymer film, and the use of such polymer film and said polymerizable LC material in optical, electro-optical, decorative or security devices.
Claims21
A polymerizable LC material, comprising one or more reactive mesogenic compounds, one or more chiral compounds, and a block copolymer that comprises at least one polyfluorooxetane block bonded to a polyether block, wherein said polyfluorooxetane block has one or more repeating units of the formula
- wherein each
- n and m are each and independently an integer from 1 to 6,
- R is hydrogen or an alkyl group having from 1 to 6 carbon atoms,
- Rf and Rf* are each and independently a linear or branched alkyl group of from 1 to about 20 carbon atoms with a minimum of 50% of the hydrogen atoms of said Rf or Rf* alkyl group being replaced by F, and optionally up to all of the remaining H atoms being replaced by I, Cl, or Br,
- DP is from 2 to about 100.
A process for the preparation of a polymerizable LC material, comprising the steps of mixing one or more block copolymers comprising at least one polyfluorooxetane block bonded to a polyether block, wherein said polyfluorooxetane block has one or more repeating units of the formula
- wherein each
- n and m are each and independently an integer from 1 to 6,
- R is hydrogen or an alkyl group having from 1 to 6 carbon atoms, Rf and Rf* are each and independently a linear or branched alkyl group of from 1 to about 20 carbon atoms with a minimum of 50% of the hydrogen atoms of said Rf or Rf* alkyl group being replaced by F, and optionally up to all of the remaining H atoms being replaced by I, Cl, or Br, and
- DP is from 2 to about 100,
- with one or more reactive mesogenic compounds and one or more chiral compounds.
Dependencies are inferred from the claim text.