摘要:
The invention relates to an optically biaxial film comprising an anisotropic material with uniform helically twisted structure and a reflection wavelength below 400 nm, to methods and materials for its preparation, to its use as retardation or compensation film in optical devices like liquid crystal displays, and to compensators and liquid crystal displays comprising such a biaxial film.
摘要:
A dichroic guest-host polarizer comprises an oriented polymerized liquid crystal host and aligned therewith a dichroic guest. The dichroic ratio of the polarizer is about 15 or more. The polarizer may have a small thickness, be manufactured using a wet deposition method, optionally in accordance with a desired pattern, and be provided on the inside of a liquid crystal cell. Polymerizable liquid crystals having a highly ordered mesophase which may be suitable used to obtain highly oriented polymer films such as polarizer films are disclosed.
摘要:
Composition comprising at least one ethylenically unsaturated monomer to which a photochernically isomerizable or dimerizable molecule is covalently bonded, and at least one ethylenically unsaturated monomer to which a sensitizer is covalently bonded, are outstandingly suitable for producing polymeric alignment layers for liquid crystals.
摘要:
Photopolymerizable liquid-crystal monomers which have high durability and a low melting point and are enantiotropic. The monomers are 4-(4-(alkyloxycarbonyloxy)benzoyloxy)phenyl acrylates represented by the formula (A) CH2=CHCOO-Ph-OCO-Ph-OCOO-R, wherein Ph is 1,4-phenylene and R is alkyl. A composition containing any of these monomers is photopolymerized to provide a polymeric liquid crystal. Also provided are an optical element containing the polymeric liquid crystal and an optical head containing the optical element as a polarizing holographic element.
摘要:
Linearly photopolymerised (LPP) orientation layers for liquid crystals, that is to say liquid crystal orientation layers, are oriented and crosslinked by means of linearly polarised light. The properties of an LPP orientation layer, such as the angle of tilt, surface wetting, voltage holding ratio and anchoring energy, can be adjusted and/or improved by mixing further substances into the starting material for the preparation of the orientation layer.
摘要:
Compounds with the general formula (I): R-S -A-Z -B-S -R, where A and B are independent ring systems with the formulae (a ), (a ) or (b), whereby in the trans-1,4-cyclohexylene ring, one or two non-adjacent CH2 groups may be replaced by oxygen, and whereby, in the 1,4-phenylene ring, one or two non-adjacent CH groups may be replaced by nitrogen; L , L , L represent, independently, hydrogen, C1-C20-alkyl, C1-C20-alkenyl, C1-C20-alkyloxy, C1-C20-alkyloxy carbonyl, formyl, C1-C20-alkyl carbonyl, C1-C20-alkyl carbonyloxy, halogen, cyano or nitro; Z1, Z2, Z3 represent, independently, a single bond, -CH2CH2-, -CH2O-, -OCH2-, -COO-, -OOC-, -(CH2)4-, -O(CH2)3-, -(CH2)3O- or -C=C-; S , S represent a spacer unit, R represents crosslinkable groups, with the proviso that at least one of the ring systems A or B represents a ring system with the formulae (a ) or (a ), Z or Z denoting a single bond.
摘要:
The invention relates to compounds of the general formula (I) X[-Y1-A1-Y2-M-Y3-A2-Z]n in which X is a silicon free, n-bond central unit; the radicals A1 and A2 are, independently of one another, a direct bond or a spacer; the radicals Y1, Y2 and Y3 are, independently of one another, a direct bond, O, S, CO, OCO, COO, OCOO, (a), (b), COS or SCO; M is a mesogene group; Z is a polymerizable group; n is a number between 2 and 6 inclusive; R is hydrogen or C1-C4-alkyl; and the combination of M-Y3-A2-Z can represent a cholesterol radical. These compounds are suitable as orientation layers for liquid crystal materials, as photolinkable adhesives, as monomers for the production of chirally dopable polymerizable liquid crystal systems, as matrix monomers for polymer-dispersed displays, or as a basic material for polymerizable liquid crystal materials for optical elements, like polarizers, retardation plates or lenses.