BAKED COLORED PENCIL LEAD AND PROCESS FOR PRODUCING THE SAME

摘要

A process for producing a baked colored pencil lead, which comprises immersing in a dye ink a white or light-colored, porous baked lead having a median pore diameter of 0.27 mu m or smaller on a volume basis and then pressurizing the dye ink to 1.5 MPa or higher to infiltrate the dye ink into pores of the baked lead. In particular, the process is one in which a dye ink solution containing at least one of nonvolatile solvents represented by the following general formulae (I) to (III) in an amount of 35 to 90 wt. % based on the ink solution and further containing a low-boiling organic solvent is infiltrated into the pores under pressure and the lead is then dried to remove the low-boiling organic solvent. A colored pencil lead obtained by the process is also provided. CH3(CH2)7CH=CH(CH2)7CH2OH (I); R1O(CH2CH2O)nH (II). [In the formula (II), R1 is decanoyl, undecanoyl, lauroyl, tridecanoyl, or oleoyl and n is 4.5 to 15.] R2-O-(CH2CH2O)mH (III). [In the formula (III), R2 is decyl, undecyl, lauryl, tridecyl, or oleyl and m is 1 to 14.]