Color erasable recording material and method for producing the same
AssigneeToshiba Tec Kabushiki Kaisha
InventorsTsuyoshi Itou, Takayasu Aoki
Life of this patent
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Abstract
According to one embodiment, a method for producing a color erasable recording material includes dispersing a granulated mixture of a color erasable recording material in an aqueous medium to form an aqueous dispersion liquid, and subjecting the dispersion liquid to a high-pressure pulverizer at a temperature not lower than the melting point of a color erasing agent to pulverize the granulated mixture in the dispersion liquid, thereby obtaining a particulate color erasable recording material having a volume average particle diameter smaller than that of the granulated mixture.
Claims17
A method for producing a color erasable recording material, comprising:
- dispersing a granulated mixture containing a color developable compound, a color developing agent, and a color erasing agent having a melting point of from 40° C. to 200° C. in an aqueous medium to form an aqueous dispersion liquid of the granulated mixture;
- and
- subjecting the dispersion liquid to a high-pressure pulverizer at a temperature not lower than the melting point of the color erasing agent to pulverize the granulated mixture in the dispersion liquid to obtain a particulate color erasable recording material having a volume average particle diameter smaller than the particle diameter of the granulated mixture.
A color erasable recording material, comprising fine particles obtained by dispersing a granulated mixture containing a color developable compound, a color developing agent, and a color erasing agent having a melting point of from 40° C. to 200° C. in an aqueous medium to form an aqueous dispersion liquid of the granulated mixture and subjecting the dispersion liquid to a high-pressure pulverizer at a temperature not lower than the melting point of the color erasing agent to pulverize the granulated mixture in the dispersion liquid into fine particles having a particle diameter smaller than that of the granulated mixture.
A method for producing a color erasable developing agent, comprising:
- dispersing a granulated mixture containing a color developable compound, a color developing agent, and a color erasing agent having a melting point of from 40° C. to 200° C. in an aqueous medium, thereby forming an aqueous dispersion liquid of the granulated mixture;
- subjecting the dispersion liquid to a high-pressure pulverizer at a temperature not lower than the melting point of the color erasing agent to pulverize the granulated mixture in the dispersion liquid, thereby obtaining a color erasable recording material in the form of fine particles having a volume average particle diameter smaller than the particle diameter of the granulated mixture;
- preparing an aqueous dispersion liquid containing the color erasable recording material in the form of fine particles, a binder resin material in the form of particles, and an aqueous medium;
- and
- aggregating the recording material in the form of fine particles and the binder resin material in the form of particles in the dispersion liquid, thereby obtaining toner particles.
A color erasable developing agent, comprising toner particles obtained by preparing an aqueous dispersion liquid containing a binder resin material in the form of particles, an aqueous medium, and a particulate color erasable recording material obtained by dispersing a granulated mixture containing a color developable compound, a color developing agent, and a color erasing agent having a melting point of from 40° C. to 200° C. in an aqueous medium to form an aqueous dispersion liquid of the granulated mixture, subjecting the dispersion liquid to a high-pressure pulverizer at a temperature not lower than the melting point of the color erasing agent to pulverize the granulated mixture in the dispersion liquid into a particulate color erasable recording material having a particle diameter smaller than that of the granulated mixture;
- and aggregating the recording material in the form of fine particles and the binder resin material in the form of particles in the dispersion liquid.
Dependencies are inferred from the claim text.