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Absorbent Material Exhibiting Equivalent Swelling Characteristics in Urine and Water

IP.com Disclosure Number: IPCOM000125907D
Publication Date: 2005-Jun-21
Document File: 2 page(s) / 16K

Publishing Venue

The IP.com Prior Art Database

Related People

Michael Niemeyer: AUTHOR [+3]

Abstract

Because of their tremendous swelling amounts in water, superabsorbent materials (SAMs) have not generally been used in the absorbent core of disposable swimpants. Typical polyacrylate based SAMs, used in personal care products, generally swell five to twenty times greater in pure water than urine. This is primarily due to the ion sensitivity of polyacrylate based SAMs. However, it would be desirable to utilize the retention capability of SAM to help reduce pre-swim urine leaks. Successful application of SAM in swimpant applications would require that the SAM swelling be minimized or controlled. This article describes an absorbent matrix comprising a SAM that has been designed to have similar swelling behavior in both saline solution and water.

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Absorbent Material Exhibiting Equivalent Swelling Characteristics in Urine and Water

Michael Niemeyer, Larry Sawyer, and Jaspreet Singh Kimberly-Clark Corporation, Neenah, Wisconsin

Background

Because of their tremendous swelling amounts in water, superabsorbent materials (SAMs) have not generally been used in the absorbent core of disposable swimpants. Typical polyacrylate based SAMs, used in personal care products, generally swell five to twenty times greater in pure water than urine. This is primarily due to the ion sensitivity of polyacrylate based SAMs. However, it would be desirable to utilize the retention capability of SAM to help reduce pre-swim urine leaks. Successful application of SAM in swimpant applications would require that the SAM swelling be minimized or controlled. This article describes a SAM containing absorbent matrix that has been designed to swell equally or similarly in both saline and water.

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Description

This absorbent matrix may be applicable for disposable swimpants; however, it could also be applied to disposable diapers, training pants, youth pants, adult incontinence products, and feminine hygiene products. This absorbent system has similar swelling and absorbent capacity for urine and pure water. An example absorbent system may include an airlaid material, consisting of a hydrocolloid material, such as superabsorbent polymer, pulp, and a binding mechanism. The structure of the material can be adapted such that the binder mechanism restrains the superabsorbent from swelling beyond a desirable set point. The superabsorbent content may range from 1% - 30% by total weight. Binder amount may range from 5% -15% by total weight. In a specific example the binder may be a thermally activated binder fiber, such as a bicomponent binder fiber. Pulp amount ranges from 55% - 94% by total weight. The SAM/pulp/binder structure can be designed t...