Thiosulfate polymers
AssigneeEastman Kodak Company
InventorsMark R. Mis, Deepak Shukla
Life of this patent
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Abstract
A thiosulfate polymer includes both an electron-accepting photosensitizer component and thiosulfate groups in the same molecule, arranged in random order along the backbone. The thiosulfate polymer composition can be formulated into compositions and applied to various articles, or used to form a predetermined polymeric pattern after photothermal reaction to form crosslinked disulfide bonds, removing non-crosslinked polymer, and reaction with a disulfide-reactive material. Such thiosulfate polymer compositions can also be used to sequester metals in nanoparticulate form, and as a way for shaping human hair in hairdressing operations.
Claims15
A non-crosslinked polymer comprising, in random order:
- (a) recurring units comprising pendant thiosulfate groups, and (b) recurring units comprising an electron-accepting photosensitizer component,
- which electron-accepting photosensitizer component has a spectral absorption in the range of at least 200 nm and up to and including 725 nm sufficient to cause the formation of crosslinking disulfide bonds from the pendant thiosulfate groups, and the electron-accepting photosensitizer component in the (b) recurring units has an excitation energy (EPS*) that is greater than or equal to the difference between the oxidation potential of the pendant thiosulfate group and the reduction potential of the electron-accepting photosensitizer component, and thus satisfies the following Equation 2:
- EPS*≧ERox−EPSred Equation 2
- wherein ERox is the oxidation potential of the pendant thiosulfate group and EPSred is the reduction potential of the electron-accepting photosensitizer component.
Dependencies are inferred from the claim text.