| 摘要 |
Non-ionic surface active compounds are provided having formula (I) wherein L is (1), (2), (3) or (4); L' is a chemical bond, -O-, -S-, -NH-, -CONH- or -SO2NH-; R is a hydrophobic substituted or unsubstituted alkyl, substituted or unsubstituted cycloalkyl, or a substituted or unsubstituted aryl group; each of R<1> and R<2> independently is hydrogen or an alkyl group having from 1 to 4 carbon atoms; each of a and b independently is 0 or an integer from 1 to 3, provided that the sum of a and b is not greater than 3; and, each of x and y independently is an integer from 3 to 7. They may be used as coating aids or dispersing aids in the preparation of photographic materials. |
