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Modified polysaccharides having improved absorbent properties and process for the preparation thereof
| Details |
Inventors: Qin, Jian; Gross, James R.; Mui, William J.; Ning, Xin; Schroeder, Wen Z.; Sun, Tong;
Assignee: Kimberly-Clark Corporation (Neenah, WI)
Primary Examiner: Mullis, Ph.D.; Jeffrey
Assistant Examiner:
Attorney, Agent or Firm: Mielke; Thomas J., Schenian; John R.
Disclosed is a method for producing a water-swellable, generally water-insoluble modified polysaccharide having improved age-stable absorption properties. The method involves forming a mixture of a modified polysaccharide, water, and, optionally, a crosslinking agent, recovering the modified polysaccharide from the mixture and, optionally, heat-treating said recovered modified polysaccharide. |
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DETAILED DESCRIPTION The present invention concerns a water-swellable, water-insoluble carboxyalkyl polysaccharide.
The carboxyalkyl polysaccharide is characterized in that it exhibits an effective initial Absorbency Under Load (AUL) value and exhibits an effective stability in its absorbent properties after aging.
One embodiment of the present invention concerns a carboxyalkyl polysaccharide that exhibits an initial Absorbency Under Load value of at least about 14 and retains at least about 50 percent of its initial Absorbency Under Load value after aging for about 60 days at about 24.
degree.
C.
and at least about 30 percent relative humidity.
The present invention further concerns methods for producing a water-swellable, water-insoluble carboxyalkyl polysaccharide that exhibits an effective initial Absorbency Under Load value and exhibits an effective stability in its absorbent properties after aging.
One method of the present invention comprises the steps of preparing a mixture comprising a water-soluble carboxyalkyl polysaccharide, water, and a crosslinking agent.
The carboxyalkyl polysaccharide is recovered from the mixture and heat-treated at a temperature for an amount of time effective so that the carboxyalkyl polysaccharide exhibits an effective initial Absorbency Under Load value and exhibits an effective stability in its absorbent properties after aging.
One embodiment of such a method comprises forming a mixture comprising a water-soluble carboxyalkyl polysaccharide, water, and a crosslinking agent; recovering said carboxyalkyl polysaccharide from said mixture; and heat-treating said recovered carboxyalkyl polysaccharide at a temperature above about 50.
degree.
C.
for a time effective to crosslink said carboxyalkyl polysaccharide to render said carboxyalkyl polysaccharide water swellable and water insoluble, wherein the water-swellable, water-insoluble carboxyalkyl polysaccharide exhibits an initial Absorbency Under Load value of at least about 14 and retains at least about 50 percent of the initial Absorbency Under Load value after aging for about 60 days at about 24
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