| 摘要 |
PROBLEM TO BE SOLVED: To obtain a carboxymethyl cellulose or its salt (CMC) capable of coexisting fluidity, coating property and thixotropy in an aqueous composition. SOLUTION: The viscosity ratioη24/η1 of the viscosityη1 after 1 hour and the viscosityη24 after 24 hours after preparing an aqueous solution of sorbitol using this CMC is >=1.4. This CMC exhibits (1) the turbidity of 1 wt.% solution using 4 wt.% sodium chloride solution as the solvent is >=30%, (2) the viscosity of 1 wt.% aqueous solution is 20 to 1,000 (mPa.s), (3) the average degree of etherification is 0.6 to 1.0. This CMC is obtained by setting the reaction temperature at 20 to 50 deg.C in a process producing the alkaline cellulose by reacting cellulose and alkali. |
