Being soluble in the organicity solvent the tensile strength of the color core, the tensile strength of the color pencil null color core which includes manner and

摘要

(57) Abstract Being soluble in the organicity solvent, direct or the alkyl cellulose which possesses the alkyl group branching and/or hydroxyalkyl cellulose 1 - 50 weight % it features that it adds to the core compound, the tensile strength of the color core, the manner which increases breaking strength and flexural strength was stated.