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AssigneeEastman Kodak Company
InventorsAlan R. Pitt, Trevor J. Wear, Danuta Gibson, Ian M. Newington, Mary C. Brick, John W. Boettcher, Gary N. Barber
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A hydrophobically capped oligomeric acrylamide or pyrrolidone is employed as a dispersant for hydrophobic materials in an aqueous medium containing a hydrophilic colloid, e.g. gelatin. The hydrophobic materials include photographic addenda such as color couplers or solid particle dyes. Preferred dispersants have the general formula R—L—T (1) or 1 in which R, R1 and R2 are each independently selected from aliphatic hydrocarbyl, aryl-(aliphatic hydrocarbyl) and (aliphatic hydrocarbyl)-aryl groups, L is a sulphur atom or a linking group that contains a sulphur atom attached to the T group, and T is a hydrophilic oligomeric group obtained by the oligomerisation of one or more vinyl monomers having an amido function.
A composition that comprises an aqueous medium containing a hydrophilic colloid, a hydrophobic material dispersed in the said medium and a dispersant, wherein the dispersant is a hydrophobically capped oligomeric acrylamide or pyrrolidone.
A photographic material which comprises a support bearing a plurality of layers each of which contains a hydrophilic colloid, wherein at least one such layer comprises a composition that comprises a hydrophilic colloid, a hydrophobic material dispersed in the hydrophilic colloid and a dispersant, wherein the dispersant is a hydrophobically capped oligomeric acrylamide or pyrrolidone.
Dependencies are inferred from the claim text.