Recording material for color photography
AssigneeCiba-Geigy Corporation
InventorsDavid G. Leppard, Michael Rasberger
Life of this patent
Estimating the term…
Abstract
Recording material, for color photography, which contains at least one piperidine compound containing one or more alkyl-substituted phenol groups, as the light stabilizer, in at least one light-sensitive silver halide emulsion layer, one interlayer and/or one protective layer. Colored images which are obtained by image-wise exposure and development of this recording material for color photography display good stability towards the action of visible and ultraviolet light.
Claims8
A recording material, for colour photography, which contains at least one piperidine compound as the light stabiliser in at least one light-sensitive silver halide emulsion layer, one interlayer and/or one protective layer, wherein the piperidine compound has the formula ##STR15## in which R.sub.1 is hydrogen or alkyl having 1 to 4 carbon atoms, R.sub.2 is alkyl or hydroxyalkyl, each having 1 to 12 carbon atoms, alkenyl or alkynyl having 3 or 4 carbon atoms, benzyl or R.sub.6 CO--, in which R.sub.6 is hydrogen, alkyl having 1 to 12 carbon atoms, alkenyl having 2 or 3 carbon atoms, chloromethyl, cyclohexyl, benzyl or phenyl or phenylethyl, which are unsubstituted or substituted by two alkyl groups, each having 1 to 4 carbon atoms, and one hydroxyl group, R.sub.3 is hydrogen or methyl, R.sub.4 and R.sub.5 are each alkyl having 1 to 5 carbon atoms or cycloalkyl having 5 to 8 carbon atoms and Y is hydrogen, alkyl having 1 to 12 carbon atoms or --C.sub.n H.sub.2n COOR.sub.7, in which n is 0 or an integer from 1 to 10 and R.sub.7 is hydrogen, alkyl having 1 to 18 carbon atoms, preferably methyl or ethyl, or the radical of the formula ##STR16## or Y is --CH.sub.2 CH.sub.2 CN or --NHCOR.sub.8, in which R.sub.8 is methyl, ethyl, phenyl or benzyl, or Y is also cyano, benzyl or the radical of the formula ##STR17## in which R.sub.1 and R.sub.2 are as defined and R.sub.9 is hydrogen or alkyl having 1 to 4 carbon atoms, m is 1 or 2 and p is 1 or 0.
Dependencies are inferred from the claim text.