Pre-dyes, pre-dye compositions, and methods of developing a color
AssigneeKimberly-Clark Worldwide, Inc.
InventorsRonald Sinclair Nohr, John Gavin MacDonald
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Abstract
One embodiment of the present invention is a method and composition comprising a novel pre-dye molecule that is colorless and stable to ordinary light. The pre-dye molecule is capable of forming a color when exposed to certain wavelengths of electromagnetic radiation. A second embodiment of the present invention is a method of converting a conventional leuco dye to a colored composition by exposing the leuco dye admixed with a radiation transorber to certain wavelengths of electromagnetic radiation.
Claims28
A pre-dye composition comprising a dye covalently bound to a radiation transorber adapted so that the pre-dye is colorless and will form a color when irradiated with radiation, the radiation transorber comprising a wavelength-selective sensitizer covalently bonded to a reactive species-generating photoreactor, wherein said composition further comprises a molecular includant covalently bonded to the radiation transorber.
A method of developing a color comprising:
- providing a composition comprising a pre-dye, wherein the pre-dye comprises a dye covalently bound to a radiation transorber which is covalently bonded to a molecular includant, and wherein the pre-dye is colorless and will form a color when irradiated with radiation, the radiation transorber comprising a wavelength-selective sensitizer covalently bonded to a reactive species-generating photoreactor;
- and
- irradiating the composition with radiation at a wavelength and dosage level sufficient to irreversibly mutate the colorant.
A mutable dye composition comprising a leuco dye admixed with a radiation transorber and a molecular includant, wherein the radiation transorber comprises a wavelength-selective sensitizer covalently bonded to a reactive species-generating photoreactor, and wherein the radiation transorber is covalently bonded to the molecular includant.
A method of developing a color comprising:
- providing a composition comprising a leuco dye admixed with a radiation transorber covalently bonded to a molecular includant, wherein the radiation transorber comprises a wavelength-selective sensitizer covalently bonded to a reactive species-generating photoreactor;
- and
- irradiating the composition with radiation at a wavelength and dosage level sufficient to irreversibly mutate the leuco dye.
A pre-dye having the formula ##STR68## wherein X represents a radiation transorber, and wherein R represents a hydrogen, an alkyl group or an aryl group.
A method of developing a color comprising:
- providing a pre-dye which is colorless and forms a color when irradiated with radiation;
- and
- irradiating the pre-dye with radiation at a wavelength and dosage level sufficient to irreversibly mutate the pre-dye;
- wherein the pre-dye has the formula ##STR77## wherein X represents a radiation transorber, and wherein R represents a hydrogen, an alkyl group or an aryl group.
Dependencies are inferred from the claim text.