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US 12,596,302 B2Granted
Crosstalk reduction of microcapsule imaging system
AssigneePolaroid IP B. V.
InventorsRong-Chang Liang, Wei You, Chun-Jen Chen
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Abstract
Microcapsules including a color-filtering shell and a core comprising a leuco dye or dye precursor, a photoinitiator or photosensitizer, and a photohardenable or photosoftenable material are provided for use in microcapsule imaging sheets. The imaging sheets including such microcapsules reduce undesirable crosstalk among the microcapsules of various colors and provide significantly improved color fidelity of the image thus reproduced.
Claims34
A photosensitive microcapsule for a microcapsule imaging sheet, comprising:
- a color-filtering shell, and
- a core comprising a leuco dye or dye precursor, a photoinitiator or photosensitizer, and a photohardenable or photosoftenable material,
- wherein the photoinitiator is a borate of cyanine, semi-cyanine, triarylmethane, squarylium or thiopyrylium dyes,
- wherein the photosensitive microcapsule is sensitive to a specific color or a specific range of radiation spectrum, and the shell comprises one or more of a color-filtering dye or pigment that allows a wavelength corresponding to the specific color or the specific range of radiation spectrum to pass through to the core but selectively absorbs or filters all or a portion of the radiation spectrum outside of the specific color or the specific range, and
- wherein the one or more of the color-filtering dye or pigment comprises a functional group that has reacted with one or more shell-forming materials to form the shell.
2 more elements
A microcapsule imaging sheet, comprising:
- a first substrate, and
- a photosensitive microcapsule layer comprising photosensitive microcapsules in contact with a first surface of the first substrate,
- wherein the photosensitive microcapsules comprise:
- a color-filtering shell, and
- a core comprising a leuco dye, a photoinitiator or photosensitizer, and a photohardenable or photosoftenable material,
- wherein the photoinitiator is a borate of cyanine, semi-cyanine, triarylmethane, squarylium or thiopyrylium dyes, and
- wherein the photosensitive microcapsule is sensitive to a specific color or a specific range of radiation spectrum, and the shell comprises one or more of a color-filtering dye or pigment that allows a wavelength corresponding to the specific color or the specific range of radiation spectrum to pass through to the core but selectively absorbs or filters all or a portion of the radiation spectrum outside of the specific color or the specific range, and
- wherein the one or more of the color-filtering dye or pigment comprises a functional group that has reacted with one or more shell-forming materials to form the shell.
5 more elements
Dependencies are inferred from the claim text.