| 摘要 |
<p>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, sulphoalkoxycarbonylalkenyl, 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.</p> |
