| 摘要 |
This invention describes the use of surfactants of the following types: Type A-Surfactant comprising 6 to 22 carbon atom hydrophobic tail with one or more attached hydrophilic chains comprising at least 8 oxyethylene and/or glycidyl ether groups that may or may not be terminated with a negative charge such as a sulfate group. Type B-Block oligomeric surfactants comprising hydrophobic polyoxypropylene blocks (A) and hydrophilic polyoxyethylene blocks (B) joined in the manner of A-B-A, B-A-B, A-B, (A-Bn 3BOND G 3BOND (B-A)n, or (B-A)n 3BOND G(A-B)n, where G is a connective organic moiety and n is between 1 and 3. Type C-Sugar surfactants, comprising between one to three 6 to 22 carbon atom hydrophobic tail with one or more attached hydrophilic mono or oligosaccharidic chains that may or may not be terminated by a negatively charged group such as a sulfate group. in combination with gelatin-grafted-polymer particles to obtain aggregation and defect free photographic multilayer coatings that are considerably low in pressure sensitivity.
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