Process of making a wet formed cellulosic product and a wet formed cellulosic product

• US 8,328,987 B2
• Filed: 09/01/2010
• Issued: 12/11/2012
• Est. Priority Date: 09/01/2009
• Status: Active Grant

• Current Assignee: AWI Licensing LLC (Armstrong World Industries Incorporated), University of Maine System Board of Trustees
• Original Assignee: Armstrong World Industries Incorporated
• Inventors: Neivandt, David J., Kehrer, Kenneth P., Beaupre, James J.
• Primary Examiner(s): Halpern, Mark
• Application Number:
  US12/874,010
• Publication Number:
  US 20110048659A1
• Time in Patent Office: 832 Days
• Field of Search: 162/164.5, 162/158, 162/164.1, 162/164, 162/168.1, 162/168, 162/175, 162/176, 162/178, 162/181.6, 162/181.8, 162/72, 162/77
• US Class Current: 162/164.5
• CPC Class Codes: D21H 11/14 Secondary fibres working-up waste paper D21C5/02
• CPC Class Codes: D21H 17/07 Nitrogen-containing compounds
• CPC Class Codes: D21H 17/11 Halides
• CPC Class Codes: D21H 17/46 obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
• CPC Class Codes: D21H 21/10 Retention agents or drainage improvers
• CPC Class Codes: D21H 21/14 characterised by function or properties in or on the paper D21H19/66, D21H27/02 take precedence
• CPC Class Codes: D21H 21/24 Surfactants

Abstract

According to the disclosure, a process of making a wet formed cellulosic product and a wet formed cellulosic product are disclosed. The process includes providing a slurry, forming the slurry into a cellulosic product, dewatering the cellulosic product, drying the cellulosic product, and applying an additive to one or more of the slurry and the cellulosic product. The additive modifies one or more of bulk, charge, potential, cumulative pore volume, surface tension of the cellulosic product.

Claims

1. A wet formed cellulosic product, the product comprising;

a cationic surfactant and an additive,

wherein the cationic surfactant is cetyl trimethylammonium bromide ((C₁₆H₃₃)N(CH₃)₃Br) or the additive is bentonite,

wherein the additive includes one or more of the bentonite;

polyacrylamide;

montmorrilnites;

phylosilicates, anionic additives;

polyacrylic acid;

polystyrene sulfonate;

polymers having an acid selected from the group consisting of sulfonic acid, phosphoric acid, salts of carboxylic acid, salts of phosphoric acid, salts of sulfonic acid, and salts of phosphoric acid;

natural polymers;

modified natural polymers;

synthetic polymers;

homopolymers of polyacrylates;

homopolymers of polysulfonates;

homopolymers of polyphosphates;

copolymers of polyacrylates;

copolymers of polysulfonates;

copolymers of polyphosphates;

polyacrylic acid;

polymethacrylic acid;

polystryrenesulfonic acid;

carboxymethylcellulose;

guar and xanthan gums;

anionic starch;

amphoteric starch;

copolymers of acrylic acid and acrylamide;

silica;

calcium carbonate;

titanium dioxide; and

alumina.

2. The product of claim 1, wherein the cationic surfactant is cetyl trimethylammonium bromide ((C₁₆H₃₃)N(CH₃)₃Br).

3. The product of claim 1, wherein the wet formed cellulosic product is selected from the group consisting of paper and ceiling board.

4. The product of claim 1, wherein the additive is bentonite.

5. The product of claim 1, wherein the additive is polyacrylamide.