Ciba-Geigy Ag

Ilford Limited

Peter John Wright

Geoffrey M Dodwell

Robert Stanley Cook

David Francis Jennings

A photographic assembly for the photographic diffusion transfer process is provided wherein a stripping layer is used consisting of a graft copolymer of gelatin which has been substantially fully reacted with a dicarboxylic acid anhydride selected from phthalic anhydrides, succinic anhydrides, glutaric anhydrides and a monomer of a vinyl ester, a vinyl ether, an acrylic ester, an acrylic ether, a methacrylic ester or a methacrylic ether or a mixture thereof. These stripping layers exhibit good dry adhesion to the emulsion layer and to the mordant layer and moderate wet adhesion.

Stripping layers in diffusion transfer film

A photographic material which comprises a receiving element for transferred dyes is provided. The receiving element comprises a support having coated thereon a mordant layer which is made from a graft polymer prepared from gelatin, a monomer which when homopolymerized yields a water insoluble polymer and a monomer containing a sulphonate group which when homopolymerized yields a water soluble polymer. These receiving elements can be used for mordanting cationic dyes in photographic dye transfer processes.

Receiving elements containing graft gelatin polymers as dye mordants

Polymers comprising repeating units which contain groupings of the formula --CH.sub.2 OOCR.sub.1, wherein R.sub.1 is hydrogen or alkyl with 1 to 14 carbon atoms and the --CH.sub.2 --group is directly bonded to a quaternary nitrogen atom. The polymers are useful in photographic materials as mordants for anionic compounds especially for anionic dyes.

Quaternary ammonium polymers and photographic materials containing same

Film base material is provided which comprises a film of biaxially oriented synthetic linear polyester of highly hydrophobic character having superimposed thereon adherent to said film a subbing layer which contains a copolymer of vinylidene chloride, an alkyl acrylate or methacrylate, an allyl or methallyl component containing an active methylene group the monomer of which has the general formula ##STR1## wherein T is --CN or --COCH.sub.3, X is O, NH or S, and R is a hydrogen atom or methyl group and optionally at least one copolymerizable acid. The subbing layer improves the adhesion between the film support and the photographic emulsion layers and prevents the separation of the layers or frilling when the final photographic film is processed.

Biaxially oriented synthetic linear polyester film base material with

The present invention relates to polyester film material. Adherent to the polyester base the film material comprises a copolymer of

Tetrapolymer subbed photographic film

This invention relates to a silver halide photographic material at least one gelatin layer of which contains a copolymer derived from

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Ilford, United Kingdom

Peter John Wright