Use of an anionic additive to improve dry strength composition performance

Abstract

Compositions and colloidal particles are provided that may be used to improve a papermaking process. The compositions and colloidal particles may include a cationic polymer, an inorganic salt, and an anionic component. A papermaking process carried out using the presently disclosed compositions and colloidal particles may produce a paper product that has increased strength properties.

What is claimed is: 
     
         1 . An aqueous colloidal composition, comprising:
 a colloidal particle comprising a cationic polymer embedded within a colloidal hydroxide complex, wherein the colloidal particle comprises an anionic component.   
     
     
         2 . The aqueous colloidal composition of  claim 1 , wherein an overall charge of the colloidal particle is positive. 
     
     
         3 . The aqueous colloidal composition of  claim 1 , wherein the anionic component comprises a polymer, the polymer comprising a monomer selected from the group consisting of acrylamide, acrylic acid, naphthalene sulfonic acid, formaldehyde, glyoxalated polyacrylamide, and any combination thereof. 
     
     
         4 . The aqueous colloidal composition of  claim 3 , wherein the polymer comprises from about 1 mol % to about 30 mol % of the acrylic acid. 
     
     
         5 . The aqueous colloidal composition of  claim 3 , wherein the polymer has a weight average molecular weight from about 10 kDa to about 5,000 kDa. 
     
     
         6 . The aqueous colloidal composition of  claim 1 , wherein the anionic component comprises colloidal silica, carboxymethyl cellulose, a micropolymer, or any combination thereof. 
     
     
         7 . The aqueous colloidal composition of  claim 1 , comprising a pH of about 6 to about 8.5. 
     
     
         8 . The aqueous colloidal composition of  claim 1 , wherein the colloidal hydroxide complex is a colloidal ferric hydroxide complex or a colloidal aluminum hydroxide complex. 
     
     
         9 . The aqueous colloidal composition of  claim 1 , wherein the cationic polymer comprises a monomer selected from the group consisting of acrylamide, methacrylamide, 2-(dimethylamino)ethyl acrylate (“DMAEA”), 2-(dimethylamino)ethyl methacrylate (“DMAEM”), 3-(dimethylamino)propyl methacrylamide (“DMAPMA”), 3-(dimethylamino)propyl acrylamide (“DMAPA”), 3-methacrylamidopropyl-trimethyl-ammonium chloride (“MAPTAC”), 3-acrylamidopropyl-trimethyl-ammonium chloride (“APTAC”), N-vinyl pyrrolidone (“NVP”), diallyldimethylammonium chloride (“DADMAC”), diallylamine, 2-(acryloyloxy)-N,N,N-trimethylethanaminium chloride (“DMAEA.MCQ”), 2-(methacryloyloxy)-N,N,N-trimethylethanaminium chloride (“DMAEM.MCQ”), N,N-dimethylaminoethyl acrylate benzyl chloride (“DMAEA.BCQ”), N,N-dimethylaminoethyl methacrylate benzyl chloride (“DMAEM.BCQ”), 2-acrylamido-2-methylpropane sulfonic acid (“AMPS”), 2-acrylamido-2-methylbutane sulfonic acid (“AMBS”), acrylamide tertbutylsulfonate (“ATBS”), [2-methyl-2-[(1-oxo-2-propenyl)amino]propyl]-phosphonic acid, acrylic acid, methacrylic acid, maleic acid, itaconic acid, a salt of any of the foregoing monomer units, and any combination thereof. 
     
     
         10 . The aqueous colloidal composition of  claim 1 , wherein the cationic polymer comprises a glyoxalated polyacrylamide (GPAM), a polyvinylamine (PVAM), a polyethylenimine (PEI), a polyamidoamine epichlorohydrin (PAE), or any combination thereof. 
     
     
         11 . The aqueous colloidal composition of  claim 1 , wherein the cationic polymer comprises from about 1 mol % to about 50 mol % of a cationic monomer. 
     
     
         12 . The aqueous colloidal composition of  claim 8 , wherein a weight ratio of the aluminum hydroxide and/or the ferric hydroxide to the cationic polymer in the colloidal particle is from about 0.1:99 to about 99:0.1. 
     
     
         13 . The aqueous colloidal composition of  claim 1 , wherein the cationic polymer comprises from about 1 mol % to about 8 mol % of a carboxylic acid. 
     
     
         14 . The aqueous colloidal composition of  claim 3 , wherein the polymer is linear. 
     
     
         15 . A pulp fiber, comprising:
 a first layer adsorbed onto a surface of the pulp fiber, and   a second layer disposed on the first layer, wherein the first layer comprises a colloidal particle comprising a cationic polymer embedded within a colloidal hydroxide complex, and wherein the second layer comprises an anionic component.   
     
     
         16 . The pulp fiber of  claim 15 , wherein at least a portion of the cationic polymer is ionically bonded to at least a portion of the anionic component. 
     
     
         17 . The pulp fiber of  claim 15 , wherein a pulp furnish or a paper sheet comprises the fiber. 
     
     
         18 . A method of improving a papermaking process, comprising:
 adding a colloidal particle to a papermaking machine, the colloidal particle comprising a cationic polymer embedded within a colloidal hydroxide complex, and   adding an anionic component to the papermaking machine.   
     
     
         19 . The method of  claim 18 , wherein at least some of the colloidal particle is added to the papermaking machine before the anionic component. 
     
     
         20 . The method of  claim 18 , wherein the colloidal particle and the anionic component are added to a thin stock, a thick stock, a headbox, before the headbox, after the headbox, before a press section, or any combination thereof.