Crayon and process for producing the same
AssigneeSakura Color Products Corporation
InventorsKotaro Sumitomo, Masamitsu Takahashi, Hidetoshi Fukuo
Life of this patent
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Abstract
The invention provides a process for producing a crayon having a desired hardness stably without poor gelation using a benzylidene sorbitol gelling agent together with the use of carbon black as a black pigment. The process comprises: dissolving and dispersing a resin component and carbon black having a pH of not less than 5.0 in an organic solvent, dissolving at least one gelling agent selected from the group consisting of dibenzylidene sorbitol, tribenzylidene sorbitol and derivatives thereof in the resultant under heating to prepare a raw material solution, pouring the raw material solution into a molding container, and cooling and gelling the raw material solution.
Claims8
A process for producing a crayon, comprising:
- dispersing carbon black in an organic solvent, thereby obtaining an organic dispersion, wherein the total of the carbon black used has a pH of not less than 5.0,
- dissolving a resin component in the organic dispersion, thereby obtaining a mixture of the resin component and the organic dispersion,
- dissolving at least one gelling agent selected from the group consisting of dibenzylidene sorbitol, tribenzylidene sorbitol and derivatives thereof in the mixture of the resin component and the organic dispersion under heating, thereby obtaining a raw material solution,
- pouring the raw material solution into a molding container, and
- cooling and gelling the raw material solution.
A process for producing a crayon, comprising:
- dispersing carbon black in an organic solvent, thereby obtaining an organic dispersion, wherein the total of the carbon black used has a pH of not less than 5.0,
- dissolving a resin component in the organic dispersion, thereby obtaining a mixture of the resin component and the organic dispersion,
- dissolving at least one gelling agent selected from the group consisting of dibenzylidene sorbitol, tribenzylidene sorbitol and derivatives thereof in the mixture of the resin component and the organic dispersion under heating, thereby obtaining a raw material solution,
- wherein the raw material solution is such that when it is prepared by dissolving 6.0% by weight based in the weight of the resulting raw material solution of dibenzylidene sorbitol in the mixture of the resin component and the organic dispersion while the mixture is kept at a temperature of 130° C., and when the resulting raw material solution is kept at a temperature of 130° C. for three hours, followed by cooling to room temperature, the raw material solution gels smoothly,
- pouring the raw material solution into a molding container, and
- cooling and gelling the raw material solution.
Dependencies are inferred from the claim text.