US2004063367A1PendingUtilityA1

Absorbent materials having improved fluid intake and lock-up properties

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Priority: Dec 14, 2001Filed: Sep 30, 2003Published: Apr 1, 2004
Est. expiryDec 14, 2021(expired)· nominal 20-yr term from priority
Inventors:Richard Norris Dodge, IiNancy LangeJayant ChakravartyJian QinSridhar RanganathanFu-Jya TsaiCathleen Mae UttechtXiaomin Zhang
Y10T442/659Y10T442/699Y10T442/692Y10T442/696A61L 15/60Y10T442/2484
40
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Claims

Abstract

Disclosed are absorbent composites, useful in an absorbent article, having high liquid intake rates. The absorbent composites may also have a rapid liquid lock-up. Absorbent composites of this invention have an intake rate of at least about 1.9 cc liquid/second at an 80% absorbent composite saturation level and a liquid lock-up fraction of at least about 0.70 at 50% superabsorbent material saturation. The absorbent composites of this invention can be a freeze-dried composite, an airformed absorbent composite, or other fibrous or non-fibrous absorbent composites.

Claims

exact text as granted — not AI-modified
What is claimed is:  
     
         1 . An absorbent composite, comprising: 
 a water-insoluble fiber; and    a superabsorbent material;    wherein the absorbent composite has an intake rate of at least about 1.9 cubic centimeters of 0.9% by weight sodium chloride aqueous solution per second at 80% absorbent composite saturation and a liquid lock-up fraction of at least about 0.70 at 50% superabsorbent material saturation determined using 0.9% by weight sodium chloride aqueous solution.    
     
     
         2 . The absorbent composite of  claim 1 , wherein the absorbent composite has an intake rate of at least about 2.3 cubic centimeters of 0.9% by weight sodium chloride aqueous solution per second at 80% absorbent composite saturation and a liquid lock-up fraction of at least about 0.75 at 50% superabsorbent material saturation determined using 0.9% by weight sodium chloride aqueous solution.  
     
     
         3 . The absorbent composite of  claim 1 , wherein the absorbent composite has an intake rate of at least about 2.7 cubic centimeters of 0.9% by weight sodium chloride aqueous solution per second at 80% absorbent composite saturation and a liquid lock-up fraction of at least about 0.80 at 50% superabsorbent material saturation determined using 0.9% by weight sodium chloride aqueous solution.  
     
     
         4 . The absorbent composite of  claim 1 , wherein the absorbent composite has an intake rate of at least about 3.3 cubic centimeters of 0.9% by weight sodium chloride aqueous solution per second at 80% absorbent composite saturation and a liquid lock-up fraction of at least about 0.80 at 50% superabsorbent material saturation determined using 0.9% by weight sodium chloride aqueous solution.  
     
     
         5 . The absorbent composite of  claim 1 , wherein the water-insoluble fiber comprises a fiber selected from the group consisting of wood pulp fiber, cotton linter, thermoplastic fibers, elastic fibers, and combinations thereof.  
     
     
         6 . The absorbent composite of  claim 1 , wherein the water-insoluble fiber is a hydrophilic fiber.  
     
     
         7 . The absorbent composite of  claim 6 , wherein the water-insoluble fiber is a hydrophilically treated hydrophobic fiber.  
     
     
         8 . The absorbent composite of  claim 1 , wherein the absorbent composite is selected from the group comprising an airformed absorbent composite, a wetformed absorbent composite, and a freeze-dried composite.  
     
     
         9 . The absorbent composite of  claim 1 , wherein the superabsorbent material comprises a material selected from the group consisting of particles, fibers, nonwoven, aggregate, printed, coated, or combinations thereof.  
     
     
         10 . The absorbent composite of  claim 9 , wherein the superabsorbent material comprises at least one of a crosslinked anionic and a crosslinked cationic polymers.  
     
     
         11 . The absorbent composite of  claim 10 , wherein the superabsorbent material comprises a material selected from the group consisting of sodium-polyacrylate, carboxymethyl cellulose, carboxymethyl polysaccharides, polyaspartic acid salt, maleic anhydride-isobutylene copolymer, chitosan salts, polyquarternary ammonium salts, polyvinyl amines, and combinations thereof.  
     
     
         12 . The absorbent composite of  claim 1 , wherein the absorbent composite comprises the superabsorbent material in a weight amount of about 10 to 70 weight percent based on total weight of the absorbent composite.  
     
     
         13 . The absorbent composite of  claim 1 , further comprising a binder material.  
     
     
         14 . The absorbent composite of  claim 13 , wherein the binder material comprises a water-insoluble polymer.  
     
     
         15 . The absorbent composite of  claim 14 , wherein the binder material is selected from the group consisting of poly(aminoamide) epichlorohydrin polymer, latex, and combinations thereof.  
     
     
         16 . The absorbent composite of  claim 14 , wherein the binder material comprises a water-insoluble, water-swellable polymer.  
     
     
         17 . The absorbent composite of  claim 16 , wherein the binder material comprises a material selected from the group consisting of sodium-polyacrylate, carboxymethyl cellulose, chitosan salt, and combinations thereof.  
     
     
         18 . The absorbent composite of  claim 14 , wherein the binder comprises a thermoplastic fiber.  
     
     
         19 . The absorbent composite of  claim 18 , wherein the binder material comprises a material selected from the group consisting of polyethylene fibers, polypropylene fibers, polyester fibers, nylon fibers, and combinations thereof.  
     
     
         20 . The absorbent composite of  claim 13 , wherein the binder material is elastic.  
     
     
         21 . The absorbent composite of  claim 13 , wherein the binder material is water-soluble before a treatment and water-swellable and water-insoluble after the treatment.  
     
     
         22 . The absorbent composite of  claim 21 , wherein the treatment comprises a treatment selected from the group consisting of heat, ultraviolet radiation, microwave radiation, steam, high pressure, electronic beam radiation, organic solvents, humidity treatment, and combinations thereof.  
     
     
         23 . A freeze-dried composite, comprising: 
 a water-insoluble fiber; and    a superabsorbent material;    wherein the freeze-dried composite has an intake rate of at least about 1.9 cubic centimeters of 0.9% by weight sodium chloride aqueous solution per second at 80% freeze-dried composite saturation and a liquid lock-up fraction of at least about 0.70 at 50% superabsorbent material saturation determined using 0.9% by weight sodium chloride aqueous solution.    
     
     
         24 . The freeze-dried composite of  claim 23 , wherein the freeze-dried composite has an intake rate of at least about 2.3 cubic centimeters of 0.9% by weight sodium chloride aqueous solution per second at 80% freeze-dried composite saturation and a liquid lock-up fraction of at least about 0.75 at 50% superabsorbent material saturation determined using 0.9% by weight sodium chloride aqueous solution.  
     
     
         25 . The freeze-dried composite of  claim 23 , wherein the freeze-dried composite has an intake rate of at least about 2.7 cubic centimeters of 0.9% by weight sodium chloride aqueous solution per second at 80% freeze-dried composite saturation and a liquid lock-up fraction of at least about 0.80 at 50% superabsorbent material saturation determined using 0.9% by weight sodium chloride aqueous solution.  
     
     
         26 . The freeze-dried composite of  claim 23 , wherein the freeze-dried composite has an intake rate of at least about 3.3 cubic centimeters of 0.9% by weight sodium chloride aqueous solution per second at 80% freeze-dried composite saturation and a liquid lock-up fraction of at least about 0.80 at 50% superabsorbent material saturation determined using 0.9% by weight sodium chloride aqueous solution.  
     
     
         27 . The freeze-dried composite of  claim 23 , wherein the water-insoluble fiber comprises a fiber selected from the group consisting of wood pulp fiber, cotton linter, thermoplastic fibers, elastic fibers, and combinations thereof.  
     
     
         28 . The freeze-dried composite of  claim 23 , wherein the superabsorbent material comprises a material selected from the group consisting of sodium-polyacrylate, carboxymethyl cellulose, carboxymethyl polysaccharides, polyaspartic acid salt, maleic anhydride-isobutylene copolymer, chitosan salts, polyquarternary ammonium salts, polyvinyl amines, and combinations thereof.  
     
     
         29 . The freeze-dried composite of  claim 23 , wherein the freeze-dried composite comprises the superabsorbent material in a weight amount of about 10 to 70 weight percent based on total weight of the absorbent composite.  
     
     
         30 . The freeze-dried composite of  claim 23 , further comprising a binder material.  
     
     
         31 . An airformed absorbent composite, comprising: 
 a water-insoluble fiber; and    a superabsorbent material;    wherein the airformed absorbent composite has an intake rate of at least about 1.9 cubic centimeters of 0.9% by weight sodium chloride aqueous solution per second at 80% airformed absorbent composite saturation and a liquid lock-up fraction of at least about 0.70 at 50% superabsorbent material saturation determined using 0.9% by weight sodium chloride aqueous solution.    
     
     
         32 . The airformed absorbent composite of  claim 31 , wherein the airformed absorbent composite has an intake rate of at least about 2.3 cubic centimeters of 0.9% by weight sodium chloride aqueous solution per second at 80% airformed absorbent composite saturation and a liquid lock-up fraction of at least about 0.75 at 50% superabsorbent material saturation determined using 0.9% by weight sodium chloride aqueous solution.  
     
     
         33 . The airformed absorbent composite of  claim 31 , wherein the airformed absorbent composite has an intake rate of at least about 2.7 cubic centimeters of 0.9% by weight sodium chloride aqueous solution per second at 80% airformed absorbent composite saturation and a liquid lock-up fraction of at least about 0.80 at 50% superabsorbent material saturation determined using 0.9% by weight sodium chloride aqueous solution.  
     
     
         34 . The airformed absorbent composite of  claim 31 , wherein the airformed absorbent composite has an intake rate of at least about 3.3 cubic centimeters of 0.9% by weight sodium chloride aqueous solution per second at 80% airformed absorbent composite saturation and a liquid lock-up fraction of at least about 0.80 at 50% superabsorbent material saturation determined using 0.9% by weight sodium chloride aqueous solution.  
     
     
         35 . The airformed absorbent composite of  claim 31 , wherein the water-insoluble fiber comprises a fiber selected from the group consisting of wood pulp fiber, cotton linter, thermoplastic fibers, elastic fibers, and combinations thereof.  
     
     
         36 . The airformed absorbent composite of  claim 31 , wherein the superabsorbent material comprises a material selected from the group consisting of sodium-polyacrylate, carboxymethyl cellulose, carboxymethyl polysaccharides, polyaspartic acid salt, maleic anhydride-isobutylene copolymer, chitosan salts, polyquarternary ammonium salts, polyvinyl amines, and combinations thereof.  
     
     
         37 . The airformed absorbent composite of  claim 31 , wherein the airformed absorbent composite comprises the superabsorbent material in a weight amount of about 10 to 70 weight percent based on total weight of the absorbent composite.  
     
     
         38 . The airformed absorbent composite of  claim 31 , further comprising a binder material.  
     
     
         39 . A wetformed absorbent composite, comprising: 
 a water-insoluble fiber; and    a superabsorbent material;    wherein the wetformed absorbent composite has an intake rate of at least about 1.9 cubic centimeters of 0.9% by weight sodium chloride aqueous solution per second at 80% wetformed absorbent composite saturation and a liquid lock-up fraction of at least about 0.70 at 50% superabsorbent material saturation determined using 0.9% by weight sodium chloride aqueous solution.    
     
     
         40 . The wetformed absorbent composite of  claim 39 , wherein the wetformed absorbent composite has an intake rate of at least about 2.3 cubic centimeters of 0.9% by weight sodium chloride aqueous solution per second at 80% wetformed absorbent composite saturation and a liquid lock-up fraction of at least about 0.75 at 50% superabsorbent material saturation determined using 0.9% by weight sodium chloride aqueous solution.  
     
     
         41 . The wetformed absorbent composite of  claim 39 , wherein the wetformed absorbent composite has an intake rate of at least about 2.7 cubic centimeters of 0.9% by weight sodium chloride aqueous solution per second at 80% wetformed absorbent composite saturation and a liquid lock-up fraction of at least about 0.80 at 50% superabsorbent material saturation determined using 0.9% by weight sodium chloride aqueous solution.  
     
     
         42 . The wetformed absorbent composite of  claim 39 , wherein the wetformed absorbent composite has an intake rate of at least about 3.3 cubic centimeters of 0.9% by weight sodium chloride aqueous solution per second at 80% wetformed absorbent composite saturation and a liquid lock-up fraction of at least about 0.80 at 50% superabsorbent material saturation determined using 0.9% by weight sodium chloride aqueous solution.  
     
     
         43 . The wetformed absorbent composite of  claim 39 , wherein the water-insoluble fiber comprises a fiber selected from the group consisting of wood pulp fiber, cotton linter, thermoplastic fibers, elastic fibers, and combinations thereof.  
     
     
         44 . The wetformed absorbent composite of  claim 39 , wherein the superabsorbent material comprises a material selected from the group consisting of sodium-polyacrylate, carboxymethyl cellulose, carboxymethyl polysaccharides, polyaspartic acid salt, maleic anhydride-isobutylene copolymer, chitosan salts, polyquarternary ammonium salts, polyvinyl amines, and combinations thereof.  
     
     
         45 . The wetformed absorbent composite of  claim 39 , wherein the wetformed absorbent composite comprises the superabsorbent material in a weight amount of about 10 to 70 weight percent based on total weight of the absorbent composite.  
     
     
         46 . The wetformed absorbent composite of  claim 39 , further comprising a binder material.  
     
     
         47 . An absorbent composite comprising a superabsorbent material and a non-fibrous structure, wherein the absorbent composite has an intake rate of at least about 1.9 cubic centimeters of 0.9% by weight sodium chloride aqueous solution per second at 80% absorbent composite saturation and a liquid lock-up fraction of at least about 0.70 at 50% superabsorbent material saturation determined using 0.9% by weight sodium chloride aqueous solution.  
     
     
         48 . The absorbent composite of  claim 47 , wherein the absorbent composite has an intake rate of at least about 2.3 cubic centimeters of 0.9% by weight sodium chloride aqueous solution per second at 80% absorbent composite saturation and a liquid lock-up fraction of at least about 0.75 at 50% superabsorbent material saturation determined using 0.9% by weight sodium chloride aqueous solution.  
     
     
         49 . The absorbent composite of  claim 47 , wherein the absorbent composite has an intake rate of at least about 2.7 cubic centimeters of 0.9% by weight sodium chloride aqueous solution per second at 80% absorbent composite saturation and a liquid lock-up fraction of at least about 0.80 at 50% superabsorbent material saturation determined using 0.9% by weight sodium chloride aqueous solution.  
     
     
         50 . The absorbent composite of  claim 47 , wherein the absorbent composite has an intake rate of at least about 3.3 cubic centimeters of 0.9% by weight sodium chloride aqueous solution per second at 80% absorbent composite saturation and a liquid lock-up fraction of at least about 0.80 at 50% superabsorbent material saturation determined using 0.9% by weight sodium chloride aqueous solution.  
     
     
         51 . The absorbent composite of  claim 47 , wherein the superabsorbent material comprises a material selected from the group consisting of particles, fibers, nonwoven, aggregate, printed, coated, or combinations thereof.  
     
     
         52 . The absorbent composite of  claim 47 , wherein the superabsorbent material comprises a material selected from the group consisting of sodium-polyacrylate, carboxymethyl cellulose, carboxymethyl polysaccharides, polyaspartic acid salt, maleic anhydride-isobutylene copolymer, chitosan salts, polyquarternary ammonium salts, polyvinyl amines, and combinations thereof.  
     
     
         53 . The absorbent composite of  claim 47 , wherein the absorbent composite comprises the superabsorbent material in a weight amount of about 10 to 70 weight percent based on total weight of the absorbent composite.  
     
     
         54 . The absorbent composite of  claim 47 , further comprising a binder material.

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