Fibrous assemblies from cationically and anionically charged fibers

• US 3,998,690 A
• Filed: 10/02/1972
• Issued: 12/21/1976
• Est. Priority Date: 10/02/1972
• Status: Expired due to Term

• Current Assignee: The Procter & Gamble Company
• Original Assignee: The Procter & Gamble Company
• Inventors: Gloss, Robert Andrew, Lyness, Warren Irl, Bates, Norman Andrew
• Primary Examiner(s): Bashore, S. Leon
• Assistant Examiner(s): Chin, Peter
• Application Number:
  US05/293,970
• Time in Patent Office: 1,541 Days
• Field of Search: 162/141, 162/182, 162/164, 162/146, 162/183, 162/168, 162/175, 162/176, 162/181 A, 162/181 C, 162/179, 162/164 R, 162/164 EP, 162/168 R, 162/166 , 162/157 C, 162/168 N, 162/145
• US Class Current: 162/141
• CPC Class Codes: D21F 1/82 adding fibre agglomeration compositions
• CPC Class Codes: D21F 11/14 Making cellulose wadding, filter or blotting paper

Abstract

Fibrous assemblies, such as paper, having advantageous properties related to bulk, absorbency, and compaction resistance are obtained from discrete fiber aggregates by a process which comprises contacting a slurry of anionically charged fibers with a slurry of cationically charged fibers to form said discrete fiber aggregates and thereafter forming fibrous assemblies by conventional processes.

Claims

1. A process for the preparation of fibrous assemblies comprising the steps of:

a. forming separate anionically charged and cationically charged slurry aliquots of a single slurry stock, wherein said cationically charged aliquot is prepared from fibers treated at a level of from about 0,1% to about 10.0%, fiber dry weight basis, with a cationic fiber-substantive agent and wherein said anionically charged aliquot is prepared from like fibers treated at a level of from about 0.1% to about 10.0%, fiber dry weight basis, with an anionic fiber-substantive agent;

b. mixing said anionically charged aliquot and said cationically charged aliquot in a mixing zone, simultaneously or immediately thereafter;

c. collecting the resulting discrete fiber aggregates; and

d. draining and drying said aggregates.

2. The process of claim 1 wherein the cationic fiber-substantive agent is selected from the group consisting of:

metal salts, quaternary ammonium salts, urea-formaldehyde resin, melamine-formaldehyde resin, polyalkylene polyamines, polyamides, polyamide-epichlorohydrin reaction products, and polyalkylene polyamine-polysaccharide reaction products; and

the anionic fiber-substantive agent is selected from the group consisting of;

bentonite carboxylated polysaccharides, polycarboxylic acids and anhydrides thereof, and ethoxylated alcohol sulfates and sulfonates.

3. The process of claim 1 wherein the fiber is cellulosic.

4. The process of claim 3 wherein the anionically charged fiber slurry is prepared from oxidized cellulosic fibers.

5. A process for the production of cellulosic fibrous assemblies comprising the steps of:

a. forming separate anionically charged and cationically charged slurry aliquots of a single slurry stock, wherein said cationically charged aliquot is prepared from fibers treated at a level of from about 0.1% to about 10.0%, fiber dry weight basis, with a cationic cellulose fiber-substantive agent selected from the group consisting of metal salts, quaternary ammonium salts, urea-formaldehyde resin, melamine-formaldehyde resin, polyalkylene polyamines, polyamides, polyamide-epichlorohydrin reaction products, and polyalkylene polyamine-polysaccharide reaction products, and wherein said anionically charged aliquot is prepared from fibers treated at a level of from about 0.1% to about 10.0%, fiber dry weight basis, with an anionic cellulose fiber-substantive agent selected from the group consisting of bentonite, carboxylated polysaccharides, polycarboxylic acids and anhydrides thereof and ethoxylated alcohol sulfates and sulfonates;

b. mixing said anionically charged aliquot and said cationically charged aliquot in a mixing zone, simultaneously or immediately thereafter;

c. sheeting the resulting discrete fiber aggregates; and

d. draining and drying said aggregates.

6. A cellulosic fibrous assembly comprising fiber aggregates formed by:

a. forming separate anionically charged and cationically charged slurry aliquots of a single slurry stock, wherein said cationically charged aliquot is prepared from fibers treated at a level of from about 0.1% to about 10.0%, fiber dry weight basis, with a cationic cellulose fiber-substantive agent selected from the group consisting of metal salts, quaternary ammonium salts, urea-formaldehyde resin, melamine-formaldehyde resin, polyalkylene polyamines, polyamides, polyamide-epichlorohydrin reaction products, and polyalkylene polyamine-polysaccharide reaction products, and wherein said anionically charged aliquot is prepared from fibers treated at a level of from about 0.1% to about 10.0%, fiber dry weight basis, with an anionic cellulose fiber-substantive agent selected from the group consisting of bentonite, carboxylated polysaccharides, polycarboxylic acids and anhydrides thereof, and ethoxylated alcohol sulfates and sulfonates;

b. mixing said anionically charged aliquot and said cationically charged aliquot in a mixing zone, simultaneously or immediately thereafter;

c. sheeting the resulting discrete fiber aggregates; and

d. draining and drying said aggregates.