Ricoh Company, Ltd.

Tomiko Kawakami

Mitsuru Hashimoto

Masaomi Sasaki

Kiyoshi Sakai

Masafumi Ohta

Kakuji Murakami

Tadashi Fujii

Tomoyuki Yamaguchi

Hiroko Uenozono

An aqueous ink for ink-jet printing comprises as its main components (i) a water-soluble direct dye and/or acid dye, (ii) a polyhydric alcohol and/or an alkyl ether thereof, (iii) water, and (iv) at least one water-soluble non-ionic surface active agent selected from the group consisting of a polyoxyethylene alkyl amine of formula (I), a polyoxyethylene alkyl phenyl ether of formula (II) and a polyoxyethylene alkyl ether of formula (III): ##STR1## where R.sup.1 represents a group derived from a chain hydrocarbon with 16 to 19 carbon atoms; m, an integer of 0 through 18; and n, an integer of 0 through 18; where m+n equals 8 through 18; ##STR2## where R.sup.2 represents a group derived from a chain hydrocarbon with 7 to 12 carbon atoms; and x represents an integer of 12 through 20; ##STR3## where R.sup.3 and R.sup.4 each represent a group derived from a chain hydrocarbon with 6 to 8 carbon atoms; and y represents an integer of 10 through 15.

Aqueous ink for ink-jet printing

An electrophotographic element is prepared by forming a photoconductive layer containing a hydrazone compound therein on an electroconductive support member. The hydrazone compounds represented by the following general formula, are useful as photoconductive materials and as charge transport materials for use in electrophotography: ##STR1## wherein Ar represents a substituted or unsubstituted condensed polycyclic group or heterocyclic group, and R represents a methyl group, an ethyl group, a benzyl group or a phenyl group. The condensed polycyclic group includes a naphthalene ring, and an anthracene ring. The heterocyclic ring includes nitrogen, oxygen and sulfur.

Electrophotographic element with a phenyhydrazone charge transport layer

A bis-azo compound of the formula ##STR1## wherein A represents ##STR2## wherein R represents alkyl, alkoxy, nitro, dialkylamino or halogen, and n represents an integer 0, 1, 2 or 3 and when n is 2 or 3, R represents identical or different substituents selected from the group of alkyl, alkoxy, nitro, dialkylamino and halogen. The bis-azo compound is useful as a photoconductive material for the preparation of electrophotographic photoconductors.

Ortho-Bis (2-substituted azostyryl) benzene compounds

An electrophotographic element comprising a conductive substrate and a mono-layer type or multi-layer type photosensitive layer, superposed thereon, containing a photoconductive material in which said photoconductive material is a hydrazone compound having the following general formula (I) or an anile compound having the following general formula (II): ##STR1## [where R.sub.1 is a methyl, ethyl 2-hydroxyethyl or 2-chloroethyl group; R.sub.2 is a methyl, ethyl, benzyl or phenyl group; and R.sub.3 is chlorine, bromine, a C.sub.1 -C.sub.4 alkyl group, a C.sub.1 -C.sub.4 alkoxy group, a dialkylamino group with C.sub.1 -C.sub.4 alkyl or a nitro group.] ##STR2## [where R.sub.1 is the same as the said general formula (I); and R.sub.4 is a substituted or non-substituted phenyl, naphthyl, heterocyclic or C.sub.1 -C.sub.10 alkyl group.]

Electrophotographic element with carbazole hydrazone or anile charge

The present invention provides an electrophotographic element which comprises an electroconductive support and a photosensitive layer, formed thereon, which contains some disazo pigment expressed by the general formula ##STR1## [wherein A represents ##STR2## (wherein X represents aromatic ring, hetero ring or substitutes thereof, R.sub.1 represents aromatic ring, hetero ring or substitutes thereof, Ar.sub.2 and Ar.sub.3 represents aromatic ring or substitutes thereof, R.sub.1 and R.sub.3 represents hydrogen, lower alkyl group, phenyl group or substitutes thereof, and R.sub.2 represents lower alkyl group, carboxyl group or esters thereof)].

Electrophotographic element having 1,4-bis(azostyryl)-2,5 dimethoxy

The present invention provides an electrophotographic element which comprises some disazo pigment expressed by the general formula ##STR1## [wherein R.sub.1 represents a member selected from the group consisting of hydrogen atom, methyl radical, ethyl radical, methoxy radical, ethoxy radical, chlorine atom, bromine atom, nitro radical, dimethylamino radical, diethylamino radical and phenyl radical; A represents ##STR2## (wherein R.sub.2 represents hydrogen atom or chlorine atom) or ##STR3## and n is an interger of 1 or 2.] as effective component contained in the photosensitive layer thereof.

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Tokyo, Japan

Tomiko Kawakami