Compositions having increased concentrations of carboxymethylcellulose
First Claim
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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, andwherein 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.
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Abstract
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.
30 Citations
31 Claims
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1. A method for increasing the concentration of a CMC stock solution comprising:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A high solids paper coating composition comprising:
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a pigment; and an alkali solution of CMC that comprises water, a CMC in a concentration greater than about 9.8% by weight, and an alkali salt in a concentration of at least about 0.05% by weight, wherein the CMC has a degree of substitution less than about 0.9, and wherein the alkali salt is selected from the group consisting of sodium carbonate, sodium bicarbonate, sodium sulfite, sodium hydroxide, sodium silicate, potassium hydroxide, potassium bicarbonate, calcium hydroxide, and combinations thereof. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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21. A CMC stock solution comprising:
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an alkali solution of CMC comprising water, a CMC in a concentration greater than about 9.8% by weight, and an alkali salt in a concentration greater than about 0.05% by weight, wherein the CMC has a degree of substitution less than about 0.9 and a molecular weight less than about 300 kD, wherein the alkali salt is selected from the group consisting of sodium carbonate, sodium bicarbonate, sodium sulfite, sodium hydroxide, sodium silicate, potassium hydroxide, potassium bicarbonate, calcium hydroxide, and combinations thereof, 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. - View Dependent Claims (22, 23, 24, 25, 26, 27, 28, 29, 30, 31)
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Specification