| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a method for stably producing a crayon having a desired hardness without causing insufficient gelation of a stock solution in the case of producing a crayon by using a benzylidene sorbitol gelling agent and carbon black as a coloring agent. <P>SOLUTION: A crayon is produced by dissolving or dispersing a resin component, carbon black having pH of <5.0 and an organic amine in an organic solvent, dissolving at least one kind of gelling agent selected from dibenzylidene sorbitol, tribenzylidene sorbitol and their derivatives under heating to obtain a stock solution, pouring the solution in a forming vessel and cooling and gelling the solution. <P>COPYRIGHT: (C)2008,JPO&INPIT</p> |
