Agfa Gevaert Nv

Walter F De Winter

Daniel M Timmerman

August M Marien

Yvan K Gilliams

Herman J Uytterhoeven

Noel J De Volder

Jan J Priem

Marcel J Monbaliu

Hubert Vandenabeele

Frans Henri Claes

Albert E Van Hoof

Victor Jan Thijs

Etienne A Van Thillo

Leon L Vermeulen

Robert J Pollet

Raphael K Van Poucke

Hendrik E Kokelenberg

Jozef Frans Willems

Urbain Leopold Laridon

Lucien J Van Gossum

August Jean Van Paesschen

Pierre R De Roo

Willy K Van Landeghem

Bernard H Tavernier

Louis Maria De Haes

Arnold A Willem

Hugo Vital Van Goethem

Antoine Roberta Van Rossen

Arthur Henri De Cat

Hugo Karel Gevers

Marcel Stroobants

Godfried A Kockelbergh

A liquid electrophoretic developer composition for developing electrostatic latent images, wherein pigment particles for obtaining improved dispersion stability in association with at least two polymers are dispersed in an electrically insulating non-polar carrier liquid having a volume resistivity of at least 10.sup.9 ohm.cm and a dielectric constant less than 3, characterized in that the composition comprises at least one polymer (hereafter called 'polymer A') which forms a coating on the pigment particles and has a poor solubility in said liquid as determined by Test A herein described, and at least one polymer (hereafter called 'polymer B') being chemically linked to the pre-coated polymer A, said polymer B having a good solubility in said liquid as determined by Test B herein described.

Liquid electrophoretic developer composition

A liquid developer composition that is suitable for rendering visible electrostatically charged areas, which composition contains in an electrically insulating non-polar carrier liquid having a volume resistivity of at least 10.sup.9 ohm.cm and a dielectric constant less than 3, dispersed coloring matter acting as toner particles and at least one anionic addition polymer comprising anionic groups neutralized with non-polymeric counter cations, characterized in that said cations are positively charged metal ion containing coordination compounds.

Liquid developer for development of electrostatic images

A liquid developer composition that is suitable for rendering visible electrostatically charged areas which composition contains in an electrically insulating non-polar carrier liquid having a volume resistivity of at least 10.sup.9 ohm.cm and a dielectric constant less than 3, dispersed coloring matter acting as toner particles and at least one anionic polymer that includes recurring units incorporating an anionic group together with a non-polymeric counter cation, characterized in that the cation is a selected from the group consisting of:

A liquid electrophoretic developer composition suitable for rendering visible electrostatically charged areas, which composition contains in an electrically insulating non-polar carrier liquid having a volume resistivity of at least 10.sup.9 ohm.cm and a dielectric constant less than 3, dispersed coloring matter acting as toner particles and at least one polymer comprising cationic groups neutralized with counter anions, the said cationic groups being positively charged groups of metal ion containing coordination compounds.

A liquid developer composition for rendering visible electrostatically charged areas. The composition contains in an electrically insulating non-polar carrier liquid having a volume resistivity of at least 10.sup.9 ohm.cm and a dielectric constant less than 3, dispersed coloring matter acting as toner particles and at least one onium salt polymer including recurring units incorporating an onium group together with an anion. The anion has at least one of the following characteristics:

Liquid developer for development of electrostatic images comprising

A liquid electrophoretic developer composition suitable for rendering visible electrostatically charged areas, which composition contains in an electrically insulating non-polar organic carrier liquid having a volume resistivity of at least 10.sup.9 ohm.cm and a dielectric constant less than 3, pigment particles carrying at least one substance conferring electric charges on said particles, dispersed with the aid of a block copolymer containing one adsorbent group A and at least one solvatable group B, characterized in that said group A represents a polystyrene chain having a number average molecular weight of at least 2,000, and said group B represents a polymethacrylate fatty alcohol ester chain having a number average molecular weight of at least 7,000. The adsorption of said block copolymer to pigment particles is illustrated in FIG. 1.

Liquid electrophoretic developer

An aqueous copolyester dispersion suitable for the subbing of polyester film without use of organic solvents wherein the copolyester contains recurring ester groups derived from ethylene glycol and an acid mixture essentially consisting of 20 to 60 mole % of isophthalic acid, 6 to 10 mole % of sulphoisophthalic acid whose sulfo group is in salt from, 0.05 to 1 mole % of an aromatic polycarboxylic acid compound having at least three carboxylic acid groups, which compound is not capable of forming intramolecularly an anhydride and includes at least two carboxylated aromatic nuclei, and the balance of terephthalic acid; the copolyester has a glass transition temperature of at least 50.degree. C. and an intrinsic viscosity of from 0.15 to 0.45 dl/g when measured at 25.degree. C. in a mixture of phenol/o-dichlorobenzene (60/40 by volume).

Aqueous copolyester dispersions suited for the subbing of polyester film

Latexes suited for homogeneously incorporating compounds with a photographically useful group into photographic silver halide emulsion materials. The latex incorporates a copolymer comprising recurring units of a monomer with photographically useful group, and recurring units of surface active monomer, according to the general formula: ##STR1## wherein: R.sup.1 is hydrogen or methyl,

Copolymer latex and photographic silver halide materials containing such

Mordanting agents for anionic organic compounds are described which comprise recurring units of the formula: ##STR1## wherein R.sub.1 is hydrogen or methyl; A is methylene or methylene substituted by C.sub.1 -C.sub.5 alkyl;

Novel polymeric mordanting agents for anionic compounds

A method of protecting a toner image on a resin-containing material surface comprising applying to the surface carrying the toner image a liquid fixing composition in which the liquid is a hydrocarbon liquid being mainly composed of (a) liquid aliphatic hydrocarbon(s) and which contains in dissolved form a film-forming copolymer composed of:

Protection of toner images

A photosensitive material is described which comprises a base and a solid photosensitive layer comprising a photopolymerizable compound and a photopolymerization initiating mixture consisting of an oxime ester, a photopolymerization initiator and a p-dialkylaminobenzene of the formula ##STR1## wherein R.sup.1 and R.sup.2 are lower alkyl, R.sup.3 is hydrogen, alkyl, alkoxy or N(R.sup.1) (R.sup.2) and X is --CO--, --CS--, CH.sub.2, or --CH(OH)--.Synergistic photocuring sensitivity is obtained by said oxime ester in admixture with said p-dialkyl aminobenzene compound.

Photopolymerizable recording materials

A latex is formed of a copolymer of 90 to 98% by weight of ethyl acrylate and 2 to 10% by weight of an ionogenic comonomer. The latter comprises in its structure a polymerizable ethylenically unsaturated bond, a hydrophobic chain comprising at least 8 carbon atoms, and a strong hydrophilic group taken from a sulpho group, a sulphato group or a phosphono group in acid or salt form. Photographic layers are described wherein the above latex is used as plasticizer for gelatin.

Emulsifier-free latexes and photographic light-sensitive elements

An electrostatic liquid developer for the development of electrostatic charge patterns comprises an electrically insulating carrier liquid having a dielectric constant of less than 3 and a volume resistivity in excess of 10.sup.9 Ohm.cm. In this electrically insulating carrier liquid are dispersed resin-precoated toner particles formed of a pigment or coloring agent precoated with a polymer of an acrylic or methacrylic acid ester of hydrogenated abietyl alcohol.

Electrophotographic liquid developer comprising acrylic or methacrylic

Abrasion marks by dry-friction and the tendency of producing pressure-scratches in photographic materials is reduced by incorporating in the gelatin silver halide emulsion layers polymeric compounds containing recurring units with semicarbazone or alkoxy carbonyl hydrazone groups in the side-chains. These recurring units are represented by one of the formulae: ##STR1## wherein: A is a single bond or --CONH-alkylene-, --COO-alkylene-, or phenylene,

Photographic elements in which gelatin silver halide layers contain

A radiation-sensitive material is described that comprises a hydrophilic colloid layer containing a dispersed phase of at least one radiation sensitive polymer the polymer chain of which comprises units with side substituents containing oxime ester groups. Upon imagewise exposure to actinic radiation the polymer in the exposed areas reduces the permeability of the hydrophilic colloid layer for an etchant in the absence of any ethylenically unsaturated monomer. The layer having upon image-wise exposure to radiation image-wise differentiations in permeability for an etchant can be used as etch-resist, without needing a washing away step, to modify image-wise the surface of an element e.g. to produce printed circuits or printing forms.

Growing community of inventors

's-Gravenwezel, Belgium

Walter F De Winter