Abstract: The present invention provides a dis-azo compound and an oil ink comprising the same. The dis-azo compound is represented by the following formula (I): wherein R1 represents substituted or unsubstituted C4˜C16 alkyl, and R2 and R3 independently represent substituted or unsubstituted C1˜C6 alkyl. Besides, the present invention also provides an electrowetting display using the oil ink.

Abstract: An organic photoconductive material is represented by the following general formula [1]:A.sub.1 --N.dbd.N--B--N.dbd.N--A.sub.2 [1],wherein B is a divalent organic group bonded to nitrogen atoms forming azo groups, A.sub.1 and A.sub.2 are groups different from each other, A.sub.1 is represented by the following general formula [A1]: ##STR1## wherein X is an atomic group which is necessary for forming an aromatic hydrocarbon ring or an aromatic hetero-ring by condensation with the benzene ring, Y is a hydrogen atom, an alkyl group, an alkoxy group or a halogen atom, m is an integer of 1 to 4, R is an aromatic hydrocarbon ring group or an aromatic hetero-ring group and n is 1 or 2, and A.sub.2 is a group represented by one of the following general formulae [A2] and [A3]: ##STR2## wherein a.sub.1 is a group selected from R, --N.dbd.CH--R and ##STR3## R, X, Y, m and n are the same as those in the general formula [A1] and p is 0 or 1.

Abstract: An organic photoconductive material is represented by the following general formula [1]:A.sub.1 -N.dbd.N-B-N.dbd.N-A.sub.2 [1],wherein B is a divalent organic group bonded to nitrogen atoms forming azo groups, A.sub.1 and A.sub.2 are groups different from each other, A.sub.1 is represented by the following general formula [A1]: ##STR1## wherein X is an atomic group which is necessary for forming an aromatic hydrocarbon ring or an aromatic hetero-ring by condensation with the benzene ring, Y is a hydrogen atom, an alkyl group, an alkoxy group or a halogen atom, m is an integer of 1 to 4, R is an aromatic hydrocarbon ring group or an aromatic hetero-ring group and n is 1 or 2, and A.sub.2 is a group represented by one of the following general formulae [A2] and [A3]: ##STR2## wherein a.sub.1 is a group selected from R, -N.dbd.CH-R and ##STR3## R, X, Y, m and n are the same as those in the general formula [A1] and p is 0 or 1.

Abstract: Disclosed is an imidazole azo dye of formula (I), which is useful for image formation and as a filter dye, which has a sharp absorption wave and which is fast to light, heat, air, moisture and chemicals. Also disclosed is a thermal transfer dye-donating material containing imidazole azo dye(s) of formula (I) preferably along with aminopyrazole azo dye(s) of formula (II). The material gives a high-density image with good color reproduction, and the image formed has improved storage stability. ##STR1## In (I), B and C independently represent a hydrogen atom or a substituent capable of being substituted in the imidazole ring; A represents an aryl or heterocyclic group; provided that when B is a hydrogen atom, C is not a hydrogen atom nor an alkyl group having from 1 to 3 carbon atoms; provided that when C is a hydrogen atom, B is not a substituted nor unsubstituted alkyl group; provided that C is not a mercapto group or an alkylthio group; and provided that B is not a carboxyl group.

Abstract: Arylazo and poly(arylazo) dyes having at least one core radical selected from naphthyl or anthracyl and having at least one 2,3-dihydro-1,3-dialkyl perimidine substituent, a guest-host composition comprising a liquid crystal host solvent and the arylazo or poly(arylazo) dichroic dye, and a liquid crystal display comprising the guest-host composition, are disclosed.

Abstract: An azo compound represented by the following general formula IA and an electrophotographic photosensitive member comprising a photosensitive layer containing the azo compound: ##STR1## wherein R.sup.1 and R.sup.2 are the same or different from each other and indicate a hydrogen atom, an alkyl group, an alkenyl group, a hydroxyl group, an alkoxy group, a carboxy group, an alkoxy carbonyl group, an acyl group, an aryl group, a halogen group or a cyano group, respectively; R.sup.14 indicates a hydrogen atom, a halogen group, an alkyl group, an alkoxy group, an aryl group, an amino group, a cyano group, a nitro group or a sulfoxide group; and A indicates a coupler residue having an acceptor property.

Abstract: Processes for preparing 2,3-dihydro-1,3-dialkyl-2,2-dialkyl perimidines and N,N'-dialkyl-1,8-naphthalene diamines are disclosed. The 2,3-dihydro-1,3-dialkyl-2,2-dialkyl perimidines are prepared by alkylating 2,3-dihydro-2,2-dialkyl perimidines with an alkylating agent in a water miscible organic solvent at room temperature to 80.degree. C. in the presence of water and an inorganic base. N,N'-dialkyl-1,8-naphthalene diamines are prepared by hydrolyzing the 2,3-dihydro-1,3-dialkyl-2,2-dialkyl perimidines with strong aqueous acid in an aqueous organic solvent and removing a ketone by-product and the aqueous organic solvent by codistillation.

Abstract: Metal complex dyestuffs which in the form of the free acid correspond to the formula ##STR1## in which the substituents have the meaning given in the description are, depending on the meanings of the substituents, suitable for use as reactive dyestuffs for cotton, wool or polyamide, as direct dyestuffs for cotton or as pigment dyestuffs. Dyeings are obtained which have good fastness properties, in particular good wet-, light- and chlorine fastness.

Abstract: Sulfo-free compounds of the formula ##STR1## where R is hydrogen or C.sub.1 -C.sub.4 -alkyl andK.sup.1 and K.sup.2 independently of one another are a radical of a coupling component, and the rings A and B may furthermore be monosubstituted or polysubstituted by fluorine, chlorine, bromine, nitro, methyl, trifluoromethyl, ethyl, acetyl, benzoyl, a carboxylic ester group, unsubstituted or substituted carbamyl or sulfamyl, an aryl sulfonate group, C.sub.1 -C.sub.4 -alkylsulfonyl, unsubstituted or substituted phenylsulfonyl, cyano or acylamino or a fused ring, are very useful as pigments for coloring printing inks, surface coatings or plastics.

Abstract: Compounds of the formula ##STR1## where X is a 5-membered heterocyclic structure from the oxazole, oxadiazole, thiazole, thiadiazole, imidazole or triazole series, Y is a radical of the formula ##STR2## the rings A, B and C can be further substituted and can be fused to a benzene ring, R.sup.1 and R.sup.2 are each hydrogen or unsubstituted or substituted alkyl, aralkyl or cycloalkyl, or R.sup.1 and R.sup.2 together with the nitrogen are piperidino, pyrrolidino or morpholino, R.sup.3 is hydrogen or unsubstituted or substituted alkyl, cycloalkyl, aralkyl, acyl, alkoxycarbonyl, aryloxycarbonyl or arylsulfonyl, and R.sup.4 is hydrogen, alkyl or cycloalkyl, are particularly useful as dyes in liquid-crystalline media.

Abstract: A dichroic dyestuff having the formulaQ--A--Zwherein:A is a poly(arylazo) linking group wherein the aryl comprises 6 to 10 carbon atoms and has 4,4'-azo linkages;Q is a bis-substituted aryl thiazyl substituent wherein the aryl comprises 6 to 10 carbon atoms;andZ is selected from the group consisting of naphthalene having an alkyl substituted amino in the 4 position, 2,3-dihydro-2,2'-substituted-perimidine and julolidine groups;forms guest-host combinations with nematic liquid crystals. These dichroic dyes have absorption maxima at wavelengths greater than 600 nanometers and transmit less than 50% of incident light having wavelengths between 600 and 700 nanometers. Thus these dyes, when combined with dichroic dyes which have absorption maxima between 400 and 600 nanometers, and nematic liquid crystals, are useful to provide electro-optical displays which change from clear to a neutral black color or vice versa when an electric field is applied to the electro-optical display.