Development modifiers for silver halide emulsions

Details Development modifiers for silver halide emulsions Development modifiers for silver halide emulsions

G - Physics

03

C

96/112, 96/113,

G03C 1/33 (2006.01) C08G 65/332 (2006.01) C08G 65/334 (2006.01) C08G 65/338 (2006.01) G03C 1/043 (2006.01) G03C 1/42 (2006.01) G03C 5/30 (2006.01)

Patent

CA 1038538

ABSTRACT OF THE DISCLOSURE A process is described of improving the development characteristics of photographic silver halide elements by the use of compounds corresponding to the formula : RO(CH2CH2O)n(CO)mA wherein : R represents hydrogen, C1-C5 alkyl or (-CO)m-A, n is an integer of at least 4, m is 0 or 1, and A represents, when m is 0, sulphoalkyl, carboxyalkyl, or sulphoalkoxycarbonylalkyl, and when m is 1, carboxyalkyl, sulphoalkoxycarbonylalkyl, carboxalkenyl, sulphoalkoxy- carbonylalkenyl, carboxyphenyl, sulphoalkoxycarbonylphenyl or sulphophenyl, the aliphatic hydrocarbon groups having at most 4C-atoms and the carboxyl and sulpho groups being in acid or salt form. The polyethylene glycol derivatives increase developability and sensitivity of black-and-white as well as colour emulsions. They also improve lith-development of photographic "lith"-emulsions.

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