| 摘要 |
The present invention provides a novel water-soluble acid-type carboxymethyl cellulose characterized by: (a) having a total degree of substitution "x" by carboxymethyl group of 0.42 to 3.00 per anhydrous glucose unit, the degree of substitution "y" by acid-type carboxymethyl groups being to 100% of the total degree of substitution, provided that when "x" is less than 2.0, "y" shall be less than (1.25x-0.5), the remaining carboxymethyl group being of the alkali salt type, (b) having an average degree of polymerization of 50 to 1500, and (c) being soluble in water, which is useful as dispersant, carrier, coating agent and various other materials and also as an intermediate for carboxymethyl cellulose derivatives; and a process for preparing them.
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