Patent GB-598477-A (GB)
Title: Improvements in or relating to colour photography
IPC: G03C7/327
Filed: 1945-03-23
Abstract: Hydrophilic substantially colourless filmforming polymers and condensation products contain dye intermediate groups.  They may contain a plurality of free hydroxyl groups and a plurality of dye intermediate groups, and the predominant hydrophilic groups may be nonphenolic hydroxyl groups.  The dye intermediate groups may be attached either directly or indirectly to the chain, and may be connected by carbonamide, sulphonamide, amino, acetal, ester, or ether linkages to polymers such as hydrolysed polyvinyl esters (e.g. polyvinyl alcohols), hydrolysed interpolymers of vinyl esters (e.g. acetate, propionate, or butyrate), with olefines (e.g. ethylene, propylene, or butene-2), or other vinyl compounds (e.g. acrylic acid, acrylic acid alkyl esters, alkyl methacrylates, vinyl cyanide, vinyl chloride, or maleic anhydride), or the partial esters (e.g. acetate, propionate, or butyrate), ethers (e.g. methyl, ethyl, or hydroxyethyl), or acetals (e.g. formals, acetals, propionals, butyrals, or benzals) of such polymers.  The change in solubility produced by the introduction of the dye intermediate groups may be balanced by the introduction of ester (e.g. acetate, propionate, benzoate, phthalate, or succinate), ether (e.g. from glycollic acid), or acetal (e.g. from phthalaldehydic acid, o-sulphobenzaldehyde, or acids of the type CHO. (CH2)X-COOH) before or after introduction of the dye intermediate groups, or by the use of dye intermediate groups containing such groups.  A group or atom readily eliminated (e.g. a sulphonic or carboxylic acid group or a halogen atom) may be in the coupling reactive position.  The dye intermediate group may contain a reactive acyclic or intracyclic methylene group or aromatic hydroxyl group and may be a phenol, naphthol, acylacetarylide, cyanoacetarylide, b -ketoester, pyrazolone, N-homophthalylamine, coumarone, indoxyl, or thioindoxyl.  Light-sensitive silver salts may be precipitated therein, and allyl thiourea, allyl isothiocyanate, sodium thiosulphate, or cyanine dyes added.  Polyvinyl alcholsalicylaldehyde condensation product; the acetal from polyvinyl alcohol, allylsalicylaldehyde, and phthalaldehydic acid; symmetrical bis-(m-1-phenyl-3-methyl-5-pyrazolone-1-yl)-urea-formaldehyde condensation product; the modified acetal of Example VI of Specification 535,341; the reaction product of 1-m-aminophenyl-3-methyl-5-pyrazolone and vinyl chloride-maleic anhydride interpolymer; the reaction product of 1 : 5-aminonaphthol and vinyl chloridemaleic anhydride interpolymer; the reaction product of oxynaphthoic acid and polyethylenemine; the reaction product of o-hydroxyphenylacetaldehyde and saponified polyglycerol; the reaction product of 1-p-carboxyphenyl-3-ethyl-5-pyrazolone and the m-aminobenzaldehyde acetal of polyvinyl alcohol; the reaction product of acetoacetaminophenylcarboxylic acid and the m-aminobenzaldehyde acetal of polyvinyl alcohol; the condensation product of m-cresol and p-cresol dialcohol; the condensation product of benzoylacet-p-hydroxyanilide and p-cresol dialcohol; and the salicylaldehyde acetal of hydrolysed ethylene vinyl acetate interpolymer are also referred to.  A colourless or yellow-dyed interlayer may be of hardened polyvinyl alcohol or of a polyvinyl acetal from an aldehyde containing a sulphonic or carboxylic acid group.  Specifications 479,838, [Group XX], 489,161, 521,169, 537,961, 578,666, 582,093 and 598,475 also are referred to.