Abstract: Anthraquinonic colorant represented by the formula (I): ##STR1## wherein Q.sup.1 and Q.sup.2 are each independently substituted or unsubstituted anthraquinonyl groups, Z.sup.1 and Z.sup.2 are bridge groups, A is an aromatic divalent group, and n is 0 or 1. The polarizing film which contains at least one colorant of the present invention in a hydrophobic resin, has excellent durability and moisture resistance.

Abstract: A hydrazone compound represented by the following formula (I): ##STR1## wherein R.sub.1 and R.sub.2 each are an aryl group or collectively with the carbon to which they are attached form a polycyclic group; R.sub.3 represents a hydrogen or halogen atom or an alkyl or phenyl group; and R.sub.4 and R.sub.5 each represent an alkyl, aralkyl or aryl group, with the proviso that at least one of R.sub.4 and R.sub.5 is an aryl group, is useful as a charge-transporting material in an electrophotographic photoreceptor and are produced by condensing the corresponding aldehyde with the corresponding H.sub.2 N--NR.sub.4 R.sub.5 hydrazine.

Abstract: A hydrazone compound represented by the following formula (I): ##STR1## wherein R.sub.1 and R.sub.2 each are an aryl group or collectively with the carbon to which they are attached form a polycyclic group; R.sub.3 represents a hydrogen or halogen atom or an alkyl or phenyl group; and R.sub.4 and R.sub.5 each represent an alkyl, aralkyl or aryl group, with the proviso that at least one of R.sub.4 and R.sub.5 is an aryl group, is useful as a charge-transporting material in an electrophotographic photoreceptor and are produced by condensing the corresponding aldehyde with the corresponding H.sub.2 N--NR.sub.4 R.sub.5 hydrazine.

Abstract: The present invention is directed to optically active compounds each containing a naphthalene skeleton, and to liquid crystal compositions which contain the aforesaid optical active compounds, these compositions being suitable for ferroelectric liquid crystal devices having excellent photostability and chemical stability and having a rapid responsivity.

Abstract: Disclosed is a polarizing film comprising a hydrophobic polymer containing a dichroic organic colorant in an oriented state which is characterized in that the dichroic organic colorant is substantially insoluble in water, organic solvents and liquid crystals and the dichroic ratio of the colorant is not less than 7 when it is measured with the film obtained by blending the colorant intimately with polyethylene terephthalate, melting the resulting blend and forming it into a film. This polarizing film has exceptionally excellent moisture resistance and thermal resistance.

Abstract: Near-infrared absorbers which contain phthalocyanine derivatives in which the four benzene rings contained in the molecule independently have 1 to 4 substituents are light and thermal resistant and possess high molar extinction coefficients. Such near-infrared absorbers are useful in optical recording media, near-infrared absorption filters, and liquid crystal display devices.

Abstract: There are here provided a novel tetraphenylthiophene derivative represented by the general formula ##STR1## wherein AM is a tertiary amino group, each of l, m and n is the integer 0 or 1 and l.gtoreq.m.gtoreq.n are useful as the charge-transporting material in an electrophotographic photoreceptor having an electrically conductive base and a photosensitive layer thereon containing a charge-transporting material and a charge-generating material, which preferably is an azo compound.

Abstract: Phthalocyanine compounds are described, which are represented by the following general formula (I): ##STR1## wherein R.sub.1 -R.sub.8 are individually a hydrogen atom or an alkyl or aryl group, a-h stand individually for an integer of 1-20, and M denotes two hydrogen atoms or a metal atom, metal halide, metal oxide, metal hydroxide, dialkylmetal, diarylmetal, bis(alkyloxy)metal or bis(trialkylsilyloxy)metal. Optical recording media and liquid crystal display panels, which contain at least one of the phthalocyanine compounds, are also described.

Abstract: There are here provided a novel tetraphenylthiophene derivative represented by the general formula ##STR1## wherein AM is a tertiary amino group, each of l, m and n is the integer 0 or 1 and l.gtoreq.m.gtoreq.n are useful as the charge-transporting material in an electrophotographic photoreceptor having an electrically conductive base and a photosensitive layer thereon containing a charge-transporting material and a charge-generating material, which preferably is an azo compound.

Abstract: Disclosed are near-infrared absorbents comprising 1,2-naphthalocyanine derivatives wherein the four naphthalene rings contained in the molecule independently have 1 to 6 substituents. Also disclosed is the use of these near-infrared absorbents in optical recording media, near-infrared absorption filters and display materials.

Abstract: Disclosed is a colored polarizing film having excellent durability which comprises (a) an organic polymer film or sheet and (b) at least one dichroic dye having an azo, anthraquinone, thioindigo, perylene or phthalone structure containing no water-soluble group. Also disclosed is a method of making a colored polarizing film using an organic polymer film or sheet formed of a polyamide or polyester resin, which comprises the steps of (a) blending (preferably, dry blending) a dichroic dye with the resinous polymer in advance, (b) melting the resulting blend and forming it into a film, and then (c) stretching the film in at least one direction.

Abstract: Disclosed is a polarizing film comprising a hydrophobic polymer containing a dichroic organic colorant in an oriented state which is characterized in that the dichroic organic colorant is substantially insoluble in water, organic solvents and liquid crystals and the dichroic ratio of the colorant is not less than 7 when it is measured with the film obtained by blending the colorant intimately with polyethylene terephthalate, melting the resulting blend and forming it into a film. This polarizing film has exceptionally excellent moisture resistance and thermal resistance.

Abstract: Disclosed herein is a electrophotographic photoreceptor having high sensitivity and excellent durability. The photoreceptor has a photosensitive layer which contains an azo compound having the tetraphenylthiophene or tetraphenylthiophene-1,1-dioxide skeleton.

Abstract: Disclosed herein is an electrophotographic photoreceptor having high sensitivity and excellent durability. The photoreceptor has a photosensitive layer which contains at least one bisazo compound having the 2-phenyl-benzooxazole skeleton.

Abstract: Provided are novel dichroic azo dyestuffs, which contain skeletons represented by the following general formula: ##STR1## at one terminals of the long axes of the molecules of the azo dyestuffs, and liquid crystal compositions containing the dichroic azo dyestuffs in forms dissolved in liquid crystals. These dichroic azo dyestuffs have large dichroic ratios and high durability, and their compositions are employed as useful display devices.

Abstract: As dichroic dyes for use in a liquid color display device, compounds of formula (I) ##STR1## such as 4'-octylphenyl perylene-3,9-dicarboxylate are provided. These compounds have various characteristic properties. For example, (1) they have a sufficient coloring ability in small amounts; (2) they have a high dichroic ratio and show a high contrast by application and non-application of voltage; (3) they have sufficient compatibility with liquid crystals; (4) they have excellent durability, are stable, and do not reduce the performance of a display device even in long-term use.

Abstract: An anthraquinonic dye of the formula ##STR1## is provided. When used as dichloric dyes in liquid crystalline color display elements, these dyes (1) have sufficient coloring ability in small amounts, (2) have a high dichloric ratio, (3) are fully soluble in liquid crystals, and (4) have excellent durability, are stable and do not degrade the performance of a display device upon long-term use.

Abstract: A composition for a liquid crystal display containing at least one nematic liquid crystalline material having dissolved therein at least one anthraquinonic dye of the formula ##STR1## wherein R is a linear or branched C.sub.7-15 alkyl group.

Abstract: A composition for nematic liquid crystal color display elements, said composition comprising at least one anthraquinonic dye represented by the following formula ##STR1## wherein X and Y are identical or different and represent --NH.sub.2 or --OH; Z represents halogen, --OR, --NHR, ##STR2## --CONHR.sub.2 or --COOR.sub.2, in which R represents an alkyl group having 1 to 15 carbon atoms or a lower alkyl group optionally substituted by --OH, ##STR3## R.sub.1 represents hydrogen, halogen, --OH, --OCH.sub.3, an alkyl group having 1 to 15 carbon atoms, or a methoxy group optionally substituted by ##STR4## and R.sub.2 is a phenyl group, an alkyl group having 2 to 5 carbon atoms or a cyclohexyl group; and n is an integer of 1 or 2 provided that when X is --NH.sub.2 and Y is --OH, and when X and Y are both --OH, n is an integer of 1, and when n represents an integer of 2, the two Z's may be identical or different dissolved in at least one nematic liquid crystal.

Abstract: As dichroic dyes for use in a liquid color display device, compounds of formula (I) ##STR1## such as 4'-octylphenyl perylene-3,9-dicarboxylate are provided. These compounds have various characteristic properties. For example, (1) they have a sufficient coloring ability in small amounts; (2) they have a high dichroic ratio and show a high contrast by application and non-application of voltage; (3) they have sufficient compatibility with liquid crystals; (4) they have excellent durability, are stable, and do not reduce the performance of a display device even in long-term use.