PURPOSE: To produce a compound which is useful as a sizing agent for a printing ink and has an excellent stability against a base or an acid, and improves the texture of a printing substrate by selecting a specific carboxymethyl sulfoethyl cellulose.
CONSTITUTION: A carboxymethyl sulfoethyl cellulose is selected from those ones in which the total degree of substitution is 1.0 or above, preferably 1.4 or above, more preferably 1.6 or above, and up to 2.2, moreover the degree of substitution by sulfoethyl groups is up to 0.6, preferably up to 0.4. This compound is, in the process of reacting an alkali cellulose with introducing agents of sulfoethyl groups and carboxymethyl groups (for example; vinyl sulfonate and monochloro acetic acid) in a slurry method, reacted with these etherifying agents simultaneously or alternatively, and further introduced to the slurry medium to react with the introducing agent of sulfoethyl radicals before alkalifying.
RAINHARUTO KUNIIUSUKE
OIGEN RAINHARUTO
KURAUSU SUTSUABURIKOUSUKI
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