Abstract Coating compositions are described which comprise a hydrophilic colloid and an ester of the sulphonate derivative of an unsaturated polycarboxylic acid material comprising more than three carboxylic acid equivalents with at least one non-ionic surface active hydroxy compound, at least one of the carboxylic acid groups being stronly with the said non-ionic surface active compound and the remaining unesterified carboxylic acid groups being in acid form, in salt form or esterified with one or more compounds containing hydroxy group(s). These coating compositions are particularly useful in the formation of photographic silver halide elements. The layers coated from these compositions show a reduced formation of comets or repellency spots and can be overcoated easily with other hydrophilic colloid layers.
A photographic element according to claim 1, wherein said non-ionic surface-active hydroxy compound is a polyalkoxylated alkylphenol.
Claim 2
Dependent Claim
19 words
A photographic element according to claim 1, wherein said non-ionic surface-active hydroxy compound is a polyalkoxylated aliphatic monohydric alcohol.
Claim 3
Dependent Claim
18 words
A photographic element according to claim 1, wherein said non-ionic surface-active hydroxy compound corresponds to the formula :
Claim 4
Dependent Claim
36 words
A photographic element according to claim 4, wherein R stands for alkyl or alkenyl comprising from six to 24 carbon atoms or for alkylated aryl, in which the alkyl contains from four to 14 carbon atoms.
Claim 5
Dependent Claim
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A photographic element according to claim 1, wherein said ester is present in the said layer in an amount ranging from 0.01% to 2% by weight based on the weight of dry colloid present in the said layer.
Claim 6
Dependent Claim
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A photographic element according to claim 1, wherein said colloid layer comprising the said ester is a light-sensitive hydrophilic colloid silver halide emulsion layer.
Claim 7
Dependent Claim
29 words
A photographic element according to claim 1, wherein the said colloid layer comprising the said ester is a protective hydrophilic colloid layer coated over a silver halide emulsion layer.