Abstract: This invention provides a method of treating waste effluent, particularly photographic effluent, containing reduced species such as thiosulphate or sulphite, by oxidation with hydrogen peroxide or a compound capable of releasing hydrogen peroxide, in the presence of a catalyst therefor. The invention is characterized in that the catalyst is immobilized on a substrate. The catalyst may be selected from chromate, vanadate and preferable molybdate or tungstate and the substrate may comprise an ion exchange material, especially an anion exchange material. The invention further provides a holding tank apparatus (10) or a conduit apparatus (20) for carrying out this method. The invention is particularly appropriate for use with fixer from redox-amplification processes.

Abstract: An optical recording element having a transparent substrate and on the surface of said substrate, a recording layer, a light reflecting layer is disclosed. The recording layer comprises (i) a metallized azo ether dye having an azo group linking a substituted 3-hydroxypyridine nucleus to a phenyl nucleus wherein the phenyl nucleus has an ether substituent ortho to the azo group and said phenyl nucleus is free of strong electron withdrawing groups and (ii) a cyanine dye. The recording layer also has, when unrecorded a refractive index, at a selected wavelength from 400 to 660 nm, comprising a real part (n) greater than 1.8 and an imaginary part (k) less than 0.2.

Abstract: Metallized azo thioether dyes having an azo group linking a substituted 3-hydroxypyridine nucleus to a phenyl nucleus are disclosed. The phenyl nucleus has an thioether substituent ortho to the azo group but does not have electron withdrawing substituents on the phenyl nucleus. The dyes are useful in optical recording elements.

Abstract: The present invention discloses optical recording elements having optical recording layers containing tetra dyes. The dyes have metallized azo dianionic dye with cationic dye counterions. The recording layer has a thickness from 225 to 300 nm.

Abstract: Metallized azo ether dyes having an azo group linking a substituted 3-hydroxypyridine nucleus to a phenyl nucleus are disclosed. The phenyl nucleus has an ether substituent ortho to the azo group. The phenyl nucleus is free of strong electron withdrawing substituents. The dyes are useful in optical recording elements.

Abstract: A metallized azo-ether dye comprising an azo group linking a substituted 3-hydroxy-pyridine nucleus to a phenyl nucleus wherein the phenyl nucleus has an alkoxy or thioether substituent at its 2-position. The dye is useful in the recording layers of optical recording elements.

Abstract: In accordance with the invention, a toner transfer member for electrostatography comprises a substrate and an outer surface layer comprising a material selected from the group consisting of a ceramer comprising a polyurethane silicate hybrid organic-inorganic network and a fluoropolymeric composition comprising a polyester-based polyurethane and polytetrafluoroethylene. The transfer member of the present invention is particularly useful for duplex electrostatographic copying processes; its outer surface layer substantially reduces the migration of release oil from the fusing station to the photoconductor via the transfer member, thereby ensuring high quality fused images on both sides of a receiver sheet.

Abstract: A poly(vinylbenzyl quaternary phosphonium) salt having the following general structure: M represents Fe or Zn;X represents F, Cl, Br or I;p is 3 when M represents Zn and p is 4 when M represents Fe;ortho, meta and para isomers of the vinyl benzyl moiety are included;R.sup.1, R.sup.2 and R.sup.3 represent hydrogen; alkyl having from 1 to 24 carbon atoms; hydroxy-; carboxy-; alkoxy-; carboalkoxy; acyloxy-; amino-; nitro-; cyano-; keto-; or halo-; and R.sup.1, R.sup.2 and R.sup.3 may be independently substituted in the ortho, meta or para positions. R.sup.1, R.sup.2 and R.sup.3 may represent more than one substituent per ring;.brket open-st.Z.brket close-st.

Abstract: An ink jet printing method is described. It comprising the steps of: providing an ink jet printer that is responsive to digital data signals; loading the printer with ink receptive substrates; loading the printer with an aqueous ink jet ink, said ink A) comprising a pigment, an aqueous carrier and potassium N-methyl-N-oleoyl taurate; and B) having a surface tension of 20 to 60 dynes/cm at 25.degree. C., a viscosity of 1 to 10 centipoise at 25.degree. C. and a particle size of less than 1.0 .mu.m; and printing on the ink receptive substrate in response to the digital data signals.

Abstract: Electrostatographic toners and developers are disclosed. They contain poly [(2-cyanoacetamido)phenyl acrylate] charge control agents.

Abstract: The invention concerns a method for decontaminating a used photographic processing bath.This method consists of putting the processing bath in contact with a heat-reversible hydrophilic polymer which becomes hydrophobic above a temperature lower than the temperature of the processing bath.The tars and other organic contaminants present in the used photographic processing bath can be removed by cooling the heat-reversible polymer below the temperature where it becomes hydrophilic.

Abstract: The present invention concerns a novel photocatalytic composition, a photocatalytic element and a novel method for the photocatalytic treatment of effluents, comprising a gaseous or aqueous solution of the organic compounds to be destroyed.This novel photocatalytic composition consists of an inorganic gel comprising a photocatalyst and an aluminosilicate inorganic polymer binder of the Imogolite type.This composition destroys organic compounds efficaciously.

Abstract: There is provided a method for removing silver from photoprocessing solutions containing hardening agents which comprises:a) adding a chelating agent to the photoprocessing solution in an amount sufficient to inhibit the precipitation of the high valent cations of the hardening agents;b) adding a base to adjust the pH of the photoprocessing solution to a value above 5.5; andc) adding a chemical precipitant for the silver contained in the photoprocessing solution;and optionally adding as a final component a flocculating agent which causes the precipitate to grow in size.

Abstract: A method of coating an optical recording layer on a transparent grooved substrate is disclosed. The recording layer is coated from a mixture of a primary and a secondary solvent. The solvent mixture provides a wide range of conformalities for optical recording layers.

Abstract: A device for destroying by electro-oxidation a photographic solution having at least one photographic developer. The device comprises a) an electro-oxidation unit adapted to degrade the photographic developer into volatile organic compounds and to produce hydrogen and oxygen, b) an expansion reservoir designed to contain the gaseous mixture generated by said electro-oxidation unit; and c) a combustion unit supplied with the gaseous mixture from the expansion reservoir.

Abstract: The present invention concerns a method for the depollution of photographic effluents. The method of the invention comprises the step of forming in situ in the effluent an adsorbent of the hydrotalcite type. This method is useful for the elimination of silver and iron in photographic effluents.

Abstract: The present invention discloses an optical recording element having, in the following order, a transparent substrate, a recording layer and a light reflecting layer wherein the recording layer(A) has a real refractive index (N) at 780 nm not less than 1.8 and an imaginary part (k) is not greater than 0.15;(B) comprises a polymeric cyanine dye that (i) has both a weight-average molecular weight greater than 50,000 and a glass transition temperature (Tg) of less than 150.degree. C.; or (ii) has either (a) a weight-average molecular weight greater than 50,000 or (b) a glass transition temperature (Tg) of less than 150.degree. C.; and(C) a thickness greater than 200 nm.

Abstract: A biocidal material comprises an organic biocide immobilised on a polymeric support characterised in that the support is water-insoluble and the biocide is covalently bound to the support by a hydrolytically stable covalent linkage. The material can be used for inhibiting bacterial growth in an aqueous medium e.g. the wash water of a photoprocessing system. The material can be housed in a flow-through container.

Abstract: A 2-(1,2-benzisothiazol-3(2H)-ylidene 1,1-dioxide)-2-cyanoacetamides having the following general structure: whereinR and R.sup.1 are defined in the specification. The compounds are useful as charge-control agents in electrostatographic toners and developers.

Abstract: (2-(Sulfonamidomethylene)-2-cyanoacetamido)phenyl acrylate compounds and polymers are disclosed. The polymers are useful charge-control agents in electrostatographic toners and developers.