Abstract: A writing device includes a liquid crystal layer including cholesteric liquid crystal material. There are electrically conductive layers between which the liquid crystal layer is disposed. There is a front writing surface layer that is transparent and a back support layer between which the electrically conductive layers and the liquid crystal layer are disposed. The cholesteric liquid crystal material changes in texture by application of pressure to the front writing surface layer to create an image. A seal confines the cholesteric liquid crystal material between the front writing surface layer and the back support layer. The electrically conductive layers are adapted to enable a voltage waveform to be applied thereto that erases the image. In one aspect, the resilience to bending the writing device is defined by enabling the writing device to be bent to a radius of curvature of 100.

Abstract: A liquid crystal writing device is erased by a stylus. The liquid crystal writing device includes a liquid crystal layer including cholesteric liquid crystal material. A user applies pressure to a flexible substrate that changes reflectivity of the cholesteric liquid crystal material to form images on the liquid crystal writing device. The liquid crystal layer is disposed between electrically conductive layers. Writing device terminals are electrically conductive and connected to the electrically conductive layers. The stylus includes stylus electronics adapted to apply an erase voltage or erase voltage waveform to the writing device terminals.

Abstract: A writing device includes a liquid crystal layer including cholesteric liquid crystal material. There are electrically conductive layers between which the liquid crystal layer is disposed. There is a front writing surface layer that is transparent and a back support layer between which the electrically conductive layers and the liquid crystal layer are disposed. The cholesteric liquid crystal material changes in texture by application of pressure to the front writing surface layer to create an image. A seal confines the cholesteric liquid crystal material between the front writing surface layer and the back support layer. The electrically conductive layers are adapted to enable a voltage waveform to be applied thereto that erases the image. In one aspect, the resilience to bending the writing device is defined by enabling the writing device to be bent to a radius of curvature of 100.

Abstract: A liquid crystal writing device is erased by a stylus. The liquid crystal writing device includes a liquid crystal layer including cholesteric liquid crystal material. A user applies pressure to a flexible substrate that changes reflectivity of the cholesteric liquid crystal material to form images on the liquid crystal writing device. The liquid crystal layer is disposed between electrically conductive layers. Writing device terminals are electrically conductive and connected to the electrically conductive layers. The stylus includes stylus electronics adapted to apply an erase voltage or erase voltage waveform to the writing device terminals.

Abstract: Disclosed is liquid crystal paper and an erasing device that is not permanently connected to the liquid crystal paper. A sheet of liquid crystal paper includes flexible polymeric substrates. A polymer network or a spacer network, in which bistable cholesteric reflective liquid crystal material is dispersed, is disposed between two of the substrates. Optional alignment layers or optional electrically conductive layers sandwich the liquid crystal material therebetween. An optional layer of light absorbing material is disposed near one of the substrates. Application of pressure to an upper substrate changes a focal conic nonreflective texture of the liquid crystal material to a reflective planar texture. The erasing device applies a voltage or heat for erasing the paper by changing the reflective planar texture to the focal conic nonreflective texture.

Abstract: Disclosed is liquid crystal paper and an erasing device that is not permanently connected to the liquid crystal paper. A sheet of liquid crystal paper includes flexible polymeric substrates. A polymer network or a spacer network, in which bistable cholesteric reflective liquid crystal material is dispersed, is disposed between two of the substrates. Optional alignment layers or optional electrically conductive layers sandwich the liquid crystal material therebetween. An optional layer of light absorbing material is disposed near one of the substrates. Application of pressure to an upper substrate changes a focal conic nonreflective texture of the liquid crystal material to a reflective planar texture. The erasing device applies a voltage or heat for erasing the paper by changing the reflective planar texture to the focal conic nonreflective texture.

Abstract: Disclosed is liquid crystal paper and an erasing device that is not permanently connected to the liquid crystal paper. A sheet of liquid crystal paper includes flexible polymeric substrates. A polymer network or a spacer network, in which bistable cholesteric reflective liquid crystal material is dispersed, is disposed between two of the substrates. Optional alignment layers or optional electrically conductive layers sandwich the liquid crystal material therebetween. An optional layer of light absorbing material is disposed near one of the substrates. Application of pressure to an upper substrate changes a focal conic nonreflective texture of the liquid crystal material to a reflective planar texture. The erasing device applies a voltage or heat for erasing the paper by changing the reflective planar texture to the focal conic nonreflective texture.

Abstract: Dyes of Formula (1) which are useful for the coloration of e.g. cellulosic materials and leathers. wherein: NiPc is a nickel phthalocyanine radical; r has a value from 1 to 3 inclusive; m has a value from 1 to 3 inclusive; p has a value from 0 to 1 inclusive; R1 is H, alkyl, substituted alkyl, aryl or substituted aryl; R2, R3 and R4 are each independently H, C1-6-alkyl or substituted C1-6-alkyl; A is phenylene, substituted phenylene, C1-6-alkylene or substituted C1-6-alkylene; Q is a labile substituent; B is phenylene, phenylene substituted by 1 or 2 sulpho groups or phenylene substituted by an alkyl or alkoxy group; Z is H or alkyl; and X and Y are each independently H, alkyl, alkoxy, halogen, carboxy or sulpho; provided that r+m+p does not exceed 4.

Abstract: An ink composition comprising:(i) a dye of Formula (1) or a salt thereof: ##STR1## wherein: A is optionally substituted phenylene;B and E each independently is optionally substituted phenylene or optionally substituted naphthylene;D is a coupling component;each R.sup.1 independently is H or optionally substituted alkyl;X is a labile or non-labile atom or group;each Z independently is --OR.sup.3, --SR.sup.3, --NR.sup.4 R.sup.5 or --Y--SO.sub.3 H in which Y is O or S; andR.sup.3, R.sup.4 and R.sup.5 each independently is H, optionally substituted alkyl, optionally substituted alkenyl, cycloalkyl, optionally substituted aralkyl, optionally substituted aryl or R.sup.4 or R.sup.5 together with the nitrogen atom to which they are attached form a 5 or 6 membered ring; and(ii) a medium comprising a low melting point solid, an organic solvent, or a mixture of water and one or more water-soluble organic solvent(s).

Abstract: A process for the coloration of a substrate, especially a textile, comprising the steps of:(a) applying to the substrate a mixture comprising an aqueous solvent and a water-soluble dye comprising molecules which contain a nucleophilic group and an electrophilic group; and(b) heating or basifying or heating and basifying the dye thereby causing molecules of the dye to join together.Also claimed are dyes, polymers and oligomers.

Abstract: 1,4-Di(hydroxy- or amino-)-2-[alkoxycarbonylmethylene(oxy or amino)phenyl(oxy)]anthraquinones. Disperse dyestuffs for synthetic textile materials, especially aromatic polyesters.

Abstract: A coated transfer sheet for pressure-sensitive copying systems which comprises an organic colorless color former containing two or more potential chromophoric systems each of which is capable of being activated substantially immediately when the compound is brought into contact with one or more activating substances.