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US7018497: Method of making an absorbent structure having high integrity

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Filing Information

Inventor(s) Young C. Ko · Kambiz B. Makoui · Richard H. Thiessen · Jason M. Laumer ·
Assignee(s) Kimberly-Clark Worldwide, Inc. ·
Attorney/Agent(s) Pauley Petersen & Erickson ·
Primary Examiner Sam Chuan Yao ·
Application Number US10409945
Filing date 04/09/2003
Issue date 03/28/2006
Prior Publication Data
Predicted expiration date 07/04/2022
Patent term adjustment 202
U.S. Classifications 156/181  · 427/393  · 427/337  · 427/392  · 156/279  · 427/407.1  · 264/109  · 264/122  · 156/277  ·
International Classifications B05D136  ·
Kind CodeB2
Related U.S. Application DataThis application is a continuation-in-part of U.S. patent application Ser. No. 10/017,760, filed on Dec. 14, 2001 now U.S. Pat. No. 6,918,981.
27 Claims, 5 Drawings


Abstract

A method of making an absorbent structure having high integrity is provided. A first superabsorbent polymer precursor composition including a monomer, a crosslinking agent and a reducing agent, and a second superabsorbent polymer precursor composition including a monomer, a crosslinking agent and an oxidizing agent are combined at a plurality of discrete, spaced-apart locations on or in a substrate. The precursor compositions react with each other to form discrete, spaced-apart microdomains of superabsorbent polymer adhering to the substrate. The spacing is sufficient to avoid gel blocking when the microdomains swell due to liquid absorption. The adhesion to the substrate is sufficient to maintain spacings between the microdomains of superabsorbent polymer.

Independent Claims | See all claims (27)

  1. 1. A method of making an absorbent structure, comprising the steps of: providing a first superabsorbent polymer precursor composition including a superabsorbent-forming monomer, a crosslinking agent and a reducing agent; providing a second superabsorbent polymer precursor composition including a superabsorbent-forming monomer, a crosslinking agent and an oxidizing agent; providing a pre-formed substrate; adding one of the first and second superabsorbent polymer precursor compositions to the substrate at a plurality of spaced-apart locations; adding the other of the first and second superabsorbent polymer precursor compositions to the substrate; and chemically reacting the first and second superabsorbent polymer precursor compositions at the plurality of spaced-apart locations to form a plurality of discrete, spaced-apart microdomains of superabsorbent polymer adhering to the substrate; wherein the first and second superabsorbant polymer precursor compositions are not combined with each other before being added to the substrate.
  2. 17. A method of making an absorbent structure, comprising the steps of: providing a fibrous web substrate including about 25 to about 100% by weight hydrophilic fibers and zero to about 75% by weight thermoplastic fibers; adding a first superabsorbent polymer precursor composition including ay least a monomer to the fibrous web at a plurality of discrete, spaced-apart locations; adding a second superabsorbent polymer precursor composition including at least a monomer to the fibrous web at the plurality of discrete, spaced-apart locations; and chemically reacting the first and second superabsorbent polymer precursor compositions at the plurality of locations to form a plurality of discrete, spaced-apart microdomains of superabsorbent polymer adhering to the fibrous web; wherein the first and second superabsorbant polymer precurser compositions are not combined with each other before being added to the fibrous web.
  3. 25. A method of making an absorbent structure, comprising the steps of: providing a first superabsorbent polymer precursor composition including a monomer, a crosslinking agent and a reducing agent; providing a second superabsorbent polymer precursor composition including a monomer, a crosslinking agent and an oxidizing agent; and chemically reacting the first and second superabsorbent polymer precursor compositions at a plurality of spaced-apart locations on or in a substrate to provide a plurality of discrete, spaced-apart microdomains of superabsorbent polymer adhered to the substrate; wherein the first and second superabsorbant polymer precurser compositions are not combined with each other apart from the substrate.

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Referenced By

Document NumberAssigneeInventorsIssue/Pub Date
US7678716 Kimberly-Clark Worldwide, Inc. Ali Yahiaoui et al. Mar 2010
US8142615 Akzo Nobel N.V. Ylva Wildlock et al. Mar 2012