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Superabsorbent polymers

A super-absorbent, absorbent technology, used in absorbent pads, pulp properties modification, bandages, etc.

Inactive Publication Date: 2003-10-22
KIMBERLY-CLARK WORLDWIDE INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Such compositions suffer from handling properties and structural integrity

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0085] The cylinder assembly is weighed again and this weight is the "wet weight of the cylinder assembly". The difference between the wet weight of the cylinder assembly and the dry weight of the cylinder assembly is the total amount of fluid absorbed by the absorbent material and is used to calculate the gel capacity. The gel capacity is the grams of liquid absorbed divided by the grams of gel. Example 1: Acrylic acid absorbent and sodium carbonate activator Preparation of polyacrylic acid (PAA) gel

[0086] 27 grams of acrylic acid, 0.05 grams of potassium persulfate (K 2 S 2 o 8 ) and 0.108 grams of N, N'-methylenebisacrylamide (all purchased from Aldrich Chemical Company) were added to 179 grams of distilled water in a 500 ml flask and mixed at room temperature to form a completely dissolved solution. The flask was then immersed in a water bath at 60 °C for at least 3 hours with continuous shaking. The resulting PAA gel was minced and dried in a ventilated oven at...

Embodiment 2

[0092] 1800 grams of oven dried fully bleached southern softwood (CR54) were pulped, stirred to disperse and then dehydrated to a consistency of 44%. To prepare fibers for the three sodium bicarbonate / sodium carbonate loadings, 960 grams, 1920 grams and 2880 grams of 50% (w / w) NaOH solution were added to the pulp in each individual mixer. Water was added to bring the total water in each mixer to 900 grams (or approximately 16.7% pulp consistency). The composition was mixed for 20 minutes at room temperature (23°C). After mixing, the pulp is transferred to a centrifuge and carefully washed. The slurry is then dewatered to a consistency of approximately 34% and mashed into fluff. The pulp was placed in a mixer and turned for 24 hours at atmospheric pressure in the presence of carbon dioxide. It was found that the pH of each sample of the pulp solution was 8.2-8.5. The fibers are then fibrillated. To determine the sodium bicarbonate content of the fibers, samples were extrac...

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PUM

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Abstract

Absorbent structures that form superabsorbent polymers in situ. The structures include an absorbent material and a fibrous material containing an activating agent. The fibrous material releases the activating agent upon stimulation with an activator, which causes the polymer to become a superabsorbent polymer. The absorbent component is desirably a water-swellable, water-insoluble polymer. The absorbent structures form a superabsorbent composition in situ. Methods of making the activating agent containing fibrous material are provided.

Description

field of invention [0001] In general, the present invention relates to an absorbent structure which forms in situ a superabsorbent composition capable of absorbing large amounts of liquid. The structure includes an absorbent material and a fibrous material with an activator therein. The fibrous material releases the activator upon contact with liquid, and the activator activates the absorbent material, rendering it a superabsorbent material. The absorbent structure can be used in disposable absorbent products, such as those commonly used to absorb body fluids. Background of the invention [0002] Water-swellable but generally water-insoluble absorbent materials, commonly referred to as superabsorbents, are well known in disposable absorbent personal care products. Such absorbent materials are commonly used in absorbent products such as diapers, athletic pants, adult incontinence products, and feminine care products in order to increase the absorbent capacity of these produ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A61F5/44A61L15/18A61L15/28A61L15/60C08J5/04C08K3/00C08K5/00C08K7/02C08L101/14D21C9/00
CPCC08J5/045A61L15/18A61L15/28D21C9/002A61L15/60C08J2300/14C08L1/00
Inventor J·渡特基维滋孙桐W·龙斯基李湧秦建章小民
Owner KIMBERLY-CLARK WORLDWIDE INC