Compositions Having Increased Concentrations of Carboxymethylcellulose

摘要

Embodiments of the present description provide methods for increasing the concentration of carboxymethylcellulose alkali solutions that are particularly suitable for use in a high solids paper coating, barrier materials, etc. Generally described, the method includes dissolving carboxymethylcellulose (CMC) and an alkali salt in water to obtain an alkali solution of CMC. The CMC desirably has a degree of substitution less than about 0.9. The alkali solution of CMC includes CMC in a concentration greater than about 9.8% by weight, has a pH from about 7.5 to about 11, and is characterized as having a viscosity of less than about 5,000 mPa.

主权项

1. A method for increasing the concentration of a CMC stock solution comprising:
dissolving a CMC, having a degree of substitution of less than about 0.9, and a sodium carbonate in water to obtain an alkali solution of CMC, wherein the alkali solution of CMC comprises the CMC in a concentration greater than about 9.8% by weight and the sodium carbonate in a concentration from about 0.1% to about 1.0% by weight, and wherein the alkali solution of CMC has a pH from about 7.5 to about 11 and has a viscosity of less than about 5,000 mPa when measured at a temperature from about 50° C. to about 60° C.