Cellulose material with improved absorbency

• US 7,482,058 B2
• Filed: 08/20/2004
• Issued: 01/27/2009
• Est. Priority Date: 09/17/2001
• Status: Expired due to Term

• Current Assignee: Evonik Superabsorber GmbH
• Original Assignee: Evonik Stockhausen GmbH (Evonik Degussa GmbH)
• Inventors: Jones, Angela Marie, Smith, Scott J., Ahmed, Iqbal
• Primary Examiner(s): WOODWARD, ANA LUCRECIA
• Application Number:
  US10/923,194
• Publication Number:
  US 20050020771A1
• Time in Patent Office: 1,621 Days
• Field of Search: 524/13, 524/35, 524/819, 524/827, 524/832, 523/200, 523/205, 428/357
• US Class Current: 428/357
• CPC Class Codes: A61F 13/53 characterised by the absorbing medium A61F13/20 takes precedence
• CPC Class Codes: A61F 2013/530481 having superabsorbent materials, i.e. highly absorbent polymer gel materials
• CPC Class Codes: A61L 15/28 Polysaccharides or their derivatives A61L15/225 takes precedence
• CPC Class Codes: C08B 15/00 Preparation of other cellulose derivatives or modified cellulose , e.g. complexes
• CPC Class Codes: C08L 1/00 Compositions of cellulose, modified cellulose or cellulose derivatives
• CPC Class Codes: C08L 1/08 Cellulose derivatives
• CPC Class Codes: C08L 2666/02 Organic macromolecular compounds, natural resins, waxes or and bituminous materials
• CPC Class Codes: Y10T 428/29 Coated or structually defined flake, particle, cell, strand, strand portion, rod, filament, macroscopic fiber or mass thereof

Abstract

An absorbent cellulose material having an application of superabsorbent polymer adhered to the cellulose material. In particular, the cellulose material has an application of pre-superabsorbent polymer adhered to the material, wherein an aqueous solution of pre-superabsorbent polymer is applied to the cellulose material and converted to superabsorbent polymer upon subjected to heat for a sufficient time. The absorbent cellulose material has a fluid retention of greater then 2 g/g.

Claims

1. An absorbent cellulose material consisting essentially of a cellulose material having an application of superabsorbent polymer composition having a neutralization of from about 50 mol% to about 80 mol% adhered to the cellulose material to form a superabsorbent polymer composition coated absorbent cellulose material wherein an aqueous solution of pre-superabsorbent polymer is applied to the cellulose material and converted to absorbent polymer upon being subjected to heat at a temperature of from about 110°

C. to about 135°

C. for a sufficient time wherein the superabsorbent polymer composition coated absorbent cellulose material has a fluid retention of greater than 2 g/g.

2. The absorbent cellulose material of claim 1 wherein the superabsorbent polymer composition has a neutralization of from about 60 mol% to about 70 mol%.

3. An absorbent cellulose material consisting essentially of a cellulose material having an application of an aqueous pre-superabsorbent polymer and superabsorbent polymer fines adhered to the material to form a superabsorbent polymer composition coated absorbent cellulose material, wherein an aqueous solution of pre-superabsorbent polymer is applied to the cellulose material and converted to superabsorbent polymer having a neutralization of from about 50 mol% to about 80 mol% upon being subjected to heat at a temperature of from about 110°

C. to about 135°

C. for a sufficient time wherein the superabsorbent polymer composition coated absorbent cellulose material has a fluid retention of greater then 2 g/g.

4. The absorbent cellulose material of claim 3 wherein the superabsorbent polymer composition has a neutralization of from about 60 mol% to about 70 mol%.