Abstract:
This invention relates to polymer particles with surface functionality for charge retention, a process for their preparation, the use of these particles for the preparation of an electrophoretic device, electrophoretic displays comprising such particle, and new polymerisable dyes.
Abstract:
This invention relates to coloured polymer particles prepared by a reverse emulsion solvent removal process, electrophoretic fluids comprising such particles, and electrophoretic display devices comprising such fluids.
Abstract:
The invention is directed to liquid crystal compositions for use in bistable liquid crystal devices and to bistable liquid crystal devices containing said liquid crystal compositions. The liquid crystal composition comprises a component (π) said component (π) containing one or more compounds having a phenyl ring of formula A Whereby XA is F, CI, SF5, NCS or a C1 to C8 alkanyl, alkenyl or alkoxy radical substituted with at least one F atom; and LA is H or F.
Abstract:
The invention is directed to the use of a liquid crystal composition in a bistable liquid crystal device and especially in a zenithal bistable nematic liquid crystal device, a nematic liquid crystal medium, and a bistable liquid crystal device comprising the liquid crystal composition whereby said liquid crystal composition comprises at least 30 weight % (based on the total weight of the composition) of a component (α) containing one or more compounds having a dielectric anisotropy Δε of at least 25, whereby at least 25 weight % (based on the total weight of the composition) of said compounds have a dielectric anisotropy Δε of at least 40; and at least 5 weight % of a component (β).
Abstract:
The invention is directed to the use of a fast switching liquid crystal composition said composition comprising at least 30 weight % of a component (α) containing one or more compounds having a dielectric anisotropy Δε of at least 25, whereby at least 25 weight % of said compounds have a dielectric anisotropy Δε of at least 40; and at least 5 weight % of a component (δ) containing one or more compounds having a ratio of γ1/TNIK of 0.51 mPa·s/K or less, a clearing point TNI of at least 100° C. and a rotational viscosity γ1 of not more than 190 mPa·s (wherein γ1 is the rotational viscosity at 20° C. in mPa·s and TNIK is the clearing point in degrees Kelvin); in a bistable liquid crystal device and especially in a zenithal bistable nematic liquid crystal device, a nematic liquid crystal medium, and a bistable liquid crystal device comprising said fast switching liquid crystal composition.
Abstract:
A pack which includes a sac, an internal frame for the sac, a shoulder harness and a hip belt; the frame includes a pair of spaced flexible rods positioned one on each side of the frame so as to extend down at least the lower part of the length of each side of the sac; tensioning means are secured between each flexible rod at or adjacent the end of said flexible rod, and an adjacent portion of the hip belt; each said tensioning means being adapted to move the corresponding flexible rod so as to bow and tension said rod and provide a relatively rigid weight transmitting connection between said rod and the corresponding portion of the hip belt; the arrangement being such that said movement of said flexible rods tends to lift the frame and the pack, decreasing the loading on the shoulder harness and increasing the loading on the belt.
Abstract:
An electrooptical system is disclosed in which a PDLC film is positioned between 2 electrode layers. The PDLC film contains a liquid crystal mixture forming microdroplets in an optically isotropic, transparent polymer matrix. The liquid crystal mixture comprises one or more compounds of formula I ##STR1## wherein R, A.sup.1, A.sup.2, Z.sup.1, Z.sup.2, X.sup.1, X.sup.2, Q, Y and n as herein defined, and one or more reactive liquid crystalline compounds. The PDLC film exhibits improved switching times, especially at low temperatures.
Abstract:
This invention relates to polymer particles comprising monomer units of at least one reactive mesogen, a process for their preparation, the use of these particles for the preparation of optical, electrooptical, electronic, electrochemical, electrophotographic, electrowetting and electrophoretic displays and/or devices and security, cosmetic, decorative, and diagnostic applications, and electrophoretic fluids and displays.
Abstract:
The invention relates to bimesogenic compounds of formula (I): R1-MG1-X1-Sp-X2-MG2-R2 wherein R1, R2, MG1, MG2, X1, X2 and Sp have the meaning given in claim 1, to the use of bimesogenic compounds of formula (I) in liquid crystal media and devices, in particular in flexoelectric liquid crystal devices, to liquid crystal media and devices, in particular flexoelectric devices, comprising bimesogenic compounds of formula (I) and to improvements in flexoelectric devices.
Abstract:
The invention relates to an alignment layer comprising a polymerized liquid crystal material with homeotrophic orientation, to methods of its preparation, to polymerizable liquid crystal compositions and liquid crystal polymers used for the preparation of the alignment layer, to liquid crystal devices comprising the alignment layer, and to a method of controlling the electrooptical steepness of a liquid crystal display comprising at least one alignment layer by varying the surface anchoring energy of the alignment layer.