| 摘要 |
<p>Surfactants useful as dispersing aids in the preparation of compositions comprising a hydrophilic colloid having hydrophobic particles dispersed therein have the structure wherein ```M is a cation; ```X represents a group having the structure wherein ```each of R 1 , R 2 , R 3 and R 4 independently represents hydrogen or alkyl; or R 1 and R 2 taken together represent cycloalkyl; or R 3 and R 4 taken together represent cycloalkyl; and, ```n represents 0 or 1; provided that the total number of carbon atoms in each X group is 3 or 4, and when R 1 is hydrogen R 2 is other than methyl. Such surfactants offer coating and photographic property advantages when incorporated in multilayer photographic materials comprising a support bearing a plurality of hydrophilic colloid layers.</p> |
