Patent GB-1408335-A (GB)
Title: Coated styrene films
IPC: G03C1/93
Filed: 1973-09-28
Abstract: 1408335 Coated styrene polymer film FUJI PHOTO FILM CO Ltd 28 Sept 1973 [2 Oct 1972] 45627/73 Heading B2E [Also in Division G2] A shaped body is composed of a styrenebased polymer having on at least one surface thereof a layer comprising (1) a complete or partial reaction product of (a) a copolymer of styrene and maleic anhydride or a copolymer of vinyl acetate and maleic anhydride with (b) at least one compound represented by the general formula R'OH in which R' is hydrogen or a monovalent hydrocarbon or alkoxy hydrocarbon group having 1-12 carbon atoms and (2) at least one compound containing two or more epoxy groups per molecule. The layer is effective to assist the adhesion of a hydrophylic photographic layer. The partial or complete reaction product may have at least partially the repeating units represented by the structure: in which R<SP>1</SP> is H or alkyl of 1-12C and R<SP>2</SP> is phenyl or -OCOCH 3 . Many examples of the compound in (b) and the epoxy group containing compound are given. The styrenebased polymer may be a homopolymer of styrene or of a substituted styrene or a copolymer of styrene with ethylene, butadiene, isoprene, vinyl chloride, vinylidene chloride, vinyl acetate, vinyl propionate, acrylic or methacryilic acid ester, acrylic or methacrylic acid amide, vinylmethyl ether, vinylbutyl ether and vinylchloroethyl ether. The support may be transparent or may contain a filler. The surface of the support can be roughened and surface-activated before or after coating with the layer. The surface-activating treatment may be by low pressure electric discharge, Corona discharge, electrode-less discharge, ozone oxidation, ultra-violet irradiation or a flame treatment. Photographic layers mentioned are hydrophilic colloid layers containing silver halide, silver iodobromide, silver iodochloride, silver chloride, silver chlorobromide or silver bromide as in a black and white film, a colour film or a printing paper and includes a hydrophilic colloid layer containing physical developing nuclei such as silver sulphide as in a receiving layer used in diffusion-transfer photography. The term "photographic layer" also includes a photographically conventional backing layer which is coated on the back of the support, e.g. to prevent curl or antihalation. The hydrophilic resin used as a photographic layer may be gelatin, graft-gelatin and acylated gelatin, casein, agarose, polyvinyl alcohol, polyvinyl pyrrolidone, vinyl pyrrolidone and vinyl alcohol copolymer with acrylic acid, methacrylic acid, or the amide or ester of such acids, vinylmethyl ether, vinyl propionate or styrene-maleic anhydride. The shaped body may be prepared by applying a solution of the reaotion product and epoxy compound in water or an organic solvent, and drying. In another method a layer of the complete or partial reaction product is coated on the styrene-based polymer body and this layer then coated with a layer of hydrophilic resin containing the epoxy compound, whereby the epoxy compound diffuses into the layer of reaction product. The hydrophilic resin may comprise a light-sensitive photographic material. The coatings may be applied by immersion, reverse roll, gravure coating. In a typical example the copolymer of maleic anhydridestyrene is reacted with methanol and then with an epoxy compound. The resulting solution was used to coat by immersion coating a biaxially stretched polystyrene support. The resulting undercoated polystyrene support was then coated with a gelatino-silver halide colour photographic emulsion having composition 3.0 g. silver chlorobromide, 3.5 g. gelatin, 14 g. benzoylaceto-2-chloro-5-dodecyloxy - carbonyl anilide (yellow coupler) emulsifier dispersion, 3 ml. triethylene phosphamide, 0.7 g. polyvinyl pyrrolidone.