Pressure sensitivity relief for photographic products
AssigneeEastman Kodak Company
InventorsPranab Bagchi, Melvin M. Kestner
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AssigneeEastman Kodak Company
InventorsPranab Bagchi, Melvin M. Kestner
Estimating the term…
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--B.sub.n .tbd.G.tbd.(B--A).sub.n, or (B--A).sub.n .tbd.G(A--B).sub.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.
A multilayer photographic element comprising at least one light sensitive silver halide containing layer, an overcoat layer containing colloidal silica and a cushioning layer which comprises composite particles having a polymer core having a mean diameter of from about 10 to 500 nm covalently bonded to a gelatin shell, and a surfactant selected from
Dependencies are inferred from the claim text.