Thiosulfate polymer compositions and articles
AssigneeEastman Kodak Company
InventorsDeepak Shukla, Mark R. Mis, Dianne Marie Meyer
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Abstract
A thiosulfate polymer composition includes an electron-accepting photosensitizer component, either as a separate compound or as an attachment to the thiosulfate polymer. The thiosulfate polymer composition can be 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.
Claims18
A composition comprising a non-crosslinked thiosulfate polymer comprising a polymer backbone and thiosulfate groups distributed along the polymer backbone, and an electron-accepting photosensitizer component, wherein the composition has photosensitivity to actinic radiation at a wavelength of at least 200 and up to and less than 725 nm sufficient to cause crosslinking of the thiosulfate groups to form disulfide bonds,
- wherein the electron-accepting photosensitizer component satisfies the following Equation 3:
- EPS*+EPSred>ERox
- wherein EPS * represents the excitation energy of the electron-accepting photosensitizer component, EPSred represents the reduction potential of the electron-accepting photosensitizer component, and ERox is the oxidation potential of the thiosulfate group in the non-crosslinked thiosulfate polymer, and
- the electron-accepting photosensitizer component is a thiazolium salt, a pyrylium salt, a naphthalene diimide, a naphthalene imide, a cyano-substituted carbocyclic aromatic compound, an aromatic anhydride, an aromatic imide, a condensed pyridinium salt, a quinone, or a ketocoumarin.
A composition comprising a non-crosslinked thiosulfate polymer comprising a polymer backbone and thiosulfate groups distributed along the polymer backbone, and an electron-accepting photosensitizer component, wherein the composition has photosensitivity to actinic radiation at a wavelength of at least 200 and up to and less than 725 nm sufficient to cause crosslinking of the thiosulfate groups to form disulfide bonds,
- wherein the electron-accepting photosensitizer component satisfies the following Equation 3:
- EPS*+EPSred>ERox
- wherein EPS* represents the excitation energy of the electron-accepting photosensitizer component, EPSred represents the reduction potential of the electron-accepting photosensitizer component, and ERox is the oxidation potential of the thiosulfate group in the non-crosslinked thiosulfate polymer,
- wherein the electron-accepting photosensitizer component is an inorganic salt or complex.
A composition comprising a non-crosslinked thiosulfate polymer comprising a polymer backbone and thiosulfate groups distributed along the polymer backbone, and an electron-accepting photosensitizer component, wherein the composition has photosensitivity to actinic radiation at a wavelength of at least 200 and up to and less than 725 nm sufficient to cause crosslinking of the thiosulfate groups to form disulfide bonds,
- wherein the electron-accepting photosensitizer component is one of the following compounds PS-1 through PS-11 and PS-15 through PS-28:
Dependencies are inferred from the claim text.