Patents Assigned to Nalco Chemical Company
  • Patent number: 6461518
    Abstract: This invention relates to a method for inhibiting the formation and deposition of silica scale in water systems. The method includes treating the water in such water systems with an effective amount of a polyamide that contains secondary amine and/or ether and amide functional groups.
    Type: Grant
    Filed: October 30, 2000
    Date of Patent: October 8, 2002
    Assignee: Nalco Chemical Company
    Inventors: Konstantinos Demadis, Douglas G. Kelley, David P. Workman, Mingli Wei
  • Patent number: 6451169
    Abstract: This invention concerns a method of increasing retention and drainage in a papermaking furnish comprising adding to the furnish an effective amount of a structurally rigid polymeric coagulant and an effective flocculating amount of a flocculant and a microparticle.
    Type: Grant
    Filed: December 20, 2000
    Date of Patent: September 17, 2002
    Assignee: Nalco Chemical Company
    Inventors: William J. Ward, Andrew J. Dunham
  • Patent number: 6444091
    Abstract: This invention concerns a method of increasing retention and drainage in a papermaking furnish comprising adding to the furnish an effective amount of a structurally rigid nonionic or anionic polymer.
    Type: Grant
    Filed: December 20, 2000
    Date of Patent: September 3, 2002
    Assignee: Nalco Chemical Company
    Inventors: William J. Ward, Andrew J. Dunham, Phillip W. Carter, Andrei S. Zelenev
  • Patent number: 6440476
    Abstract: A method to extend the shelf-life, reduce the microbial load, and enhance product appearance and quality in leafy vegetables or other fresh commodities of the like comprising applying directly to the leafy vegetable a stabilized aqueous alkali or alkaline earth metal hypobromite solution.
    Type: Grant
    Filed: December 29, 2000
    Date of Patent: August 27, 2002
    Assignee: Nalco Chemical Company
    Inventors: Eric R. Myers, Anthony W. Dallmier
  • Patent number: 6436711
    Abstract: A method of automatically controlling the addition rate of Fresh Oxygen Scavenger Product and Ultimate Oxygen Scavenger Product to a Boiler System is described and claimed. The method is based on the inherent fluorometric properties of certain Fresh Oxygen Scavenger Products and certain Ultimate Oxygen Scavengers in their reduced (unreacted) form and also, for the Ultimate Oxygen Scavengers, in their oxidized (reacted) form. It has also been found possible to enhance the fluorescent signal of certain Oxygen Scavengers by adding a borate buffer to the sample stream. By using the method of the instant claimed invention it is now possible to improve the overall control of Boiler Systems using certain Fresh Oxygen Scavenger Products and certain Ultimate Oxygen Scavenger Products.
    Type: Grant
    Filed: December 13, 2000
    Date of Patent: August 20, 2002
    Assignee: Nalco Chemical Company
    Inventors: Barbara H. Davis, Linda M. Link, John E. Hoots
  • Patent number: 6432271
    Abstract: This invention is directed to a method of increasing retention and drainage in a papermaking furnish comprising adding to the furnish an effective flocculating amount of a high molecular weight water-soluble anionic or nonionic dispersion polymer.
    Type: Grant
    Filed: October 15, 2001
    Date of Patent: August 13, 2002
    Assignee: Nalco Chemical Company
    Inventors: Jane B. Wong Shing, Chidambaram Maltesh, John R. Hurlock
  • Patent number: 6426383
    Abstract: The present invention relates to a novel process for the production of a water soluble polymer dispersion from vinylamide monomers, and, more particularly, polymers formed from N-vinylformamide monomers.
    Type: Grant
    Filed: May 28, 1997
    Date of Patent: July 30, 2002
    Assignee: Nalco Chemical Company
    Inventors: Dodd W. Fong, Manian Ramesh, Anthony G. Sommese
  • Patent number: 6423801
    Abstract: The invention is concerned with water soluble high-molecular weight quaternary ammonium graft polymer, wherein ammonium salt side chains are grafted onto a polyamine backbone under free radical conditions, and wherein the initiator system comprises a free radical-producing oxidizing agent and the polyamine backbone polymer.
    Type: Grant
    Filed: February 8, 1999
    Date of Patent: July 23, 2002
    Assignee: Nalco Chemical Company
    Inventors: Mathias Hahn, Werner Jaeger, Jeffrey R. Cramm
  • Patent number: 6423267
    Abstract: Stable biocide formulations containing oxidizing bromine are provided for biofouling control in industrial water systems. The formulations contain at least one stable oxidizing bromine compound that is prepared from at least one oxidizing chemical reagent, at least one bromine source and at least one bromine or halogen stabilizer. The resulting products are a mixture of stable oxidizing bromine compounds that can be used as a biocide in an industrial water system.
    Type: Grant
    Filed: March 2, 2000
    Date of Patent: July 23, 2002
    Assignee: Nalco Chemical Company
    Inventors: Shunong Yang, William F. McCoy, Anthony W. Dallmier
  • Patent number: 6419879
    Abstract: A synergistic composition and method for controlling biological growth in industrial fluids are disclosed, wherein the composition comprises stabilized sodium hypobromite and at least one compound selected from the group consisting of coco alkyldimethylamine oxide, n-coco alkyltrimethylenediamine, tetra-alkyl phosphonium chloride, 7-oxabicyclo[2.2.1]heptane-2,3-dicarboxylic acid and 4,5-dichloro-2-n-octyl-4-isothiazoline-3-one.
    Type: Grant
    Filed: August 12, 1999
    Date of Patent: July 16, 2002
    Assignee: Nalco Chemical Company
    Inventors: Andrew J. Cooper, Anthony W. Dallmier, Robert F. Kelly, William F. McCoy, Xi Ma
  • Patent number: 6413433
    Abstract: A process for dewatering of sludge, wherein said sludge comprises solids and water, comprising the steps of: a) adding a cationic dispersion polymer and a microparticle to said sludge, wherein said cationic dispersion polymer can be added before or after or simultaneous with the addition of said microparticle; and b) physically separating said solids from said water.
    Type: Grant
    Filed: August 31, 2000
    Date of Patent: July 2, 2002
    Assignee: Nalco Chemical Company
    Inventors: Elise Maury, Livio Mattucci, Fernando Urbani, Massimo Borelli, John Sparapany
  • Patent number: 6403726
    Abstract: The simultaneous precipitation of soluble heavy metal ions from semiconductor wastewater containing abrasive solids and enhancement of microfilter operation is achieved through the addition of an effective amount of a water-soluble polymer containing dithiocarbamate functionalities to the wastewater.
    Type: Grant
    Filed: August 14, 2000
    Date of Patent: June 11, 2002
    Assignee: Nalco Chemical Company
    Inventor: William J. Ward
  • Patent number: 6398967
    Abstract: This invention is directed to a method of clarifying water comprising adding to the water an effective clarifying amount of a low molecular weight water-soluble cationic dispersion polymer prepared by polymerizing one or more cationic monomers and one or more nonionic monomers and one or more chain transfer agents under free radical forming conditions in an aqueous solution of an anionic salt in the presence of a stabilizer polymer, wherein the cationic dispersion has a cationic charge of from about 1.0 mole percent to about 75 mole percent and an RSV of from about 0.2 dl/g to about 6 dl/g.
    Type: Grant
    Filed: April 20, 2000
    Date of Patent: June 4, 2002
    Assignee: Nalco Chemical Company
    Inventors: John W. Sparapany, Richard P. Cardile, Cathy C. Johnson, Angela P. Zagala
  • Patent number: 6379720
    Abstract: Biological fouling is effectively controlled in water systems and process streams through the addition of hops extract.
    Type: Grant
    Filed: July 18, 2000
    Date of Patent: April 30, 2002
    Assignee: Nalco Chemical Company
    Inventors: Andrew J. Cooper, Anthony W. Dallmier, Howard Raymond Barnes
  • Patent number: 6380431
    Abstract: Fluorescent monomers are described and claimed.
    Type: Grant
    Filed: August 31, 1999
    Date of Patent: April 30, 2002
    Assignee: Nalco Chemical Company
    Inventors: Wesley L. Whipple, Patrick G. Murray
  • Patent number: 6375829
    Abstract: This invention is directed to a method and apparatus for measuring the rate of calcium oxalate scale formation in a continuously flowing solution having a pH of from about 2 to about 3 comprising measuring the rate of deposition of calcium oxalate scale from the solution on to a quartz crystal microbalance having a top side comprising a working electrode in contact with the solution and a second, bottom side isolated from the solution, wherein the pH of the solution proximate to the microbalance is measured using a pH measuring module and is controlled electrochemically at from about 3.5 to about 9 and wherein the working electrode is coated with or made of a conductive material on which the intensive evolution of hydrogen gas proceeds at potentials more negative than those necessary to achieve a pH of 3.5-9 proximate to the microbalance.
    Type: Grant
    Filed: March 7, 2000
    Date of Patent: April 23, 2002
    Assignee: Nalco Chemical Company
    Inventors: Sergey M. Shevchenko, Dmitri L. Kouznetsov, Prasad Y. Duggirala
  • Patent number: 6372089
    Abstract: Disclosed are stable, aqueous colloidal silicas having surface area of greater than 700 m2/g and S-values of from 20-50. These colloidal silicas do not require treatment with surface treatment agents such as aluminum to achieve stability. These colloidal silica aquasols can be produced and stored at concentrations of greater than 7 percent by weight SiO2 solids, and even as high as 15 percent by weight solids or higher, and remain stable at room temperature for at least 30 days compared to art-known silica aquasols. These colloidal silica sols demonstrate advantageously improved performance over art-known colloidal silica sols in applications such as in drainage and retention in papermaking processes. Also disclosed are processes for making aqueous colloidal silicas of the invention and the use of such colloidal silicas in papermaking processes.
    Type: Grant
    Filed: February 14, 2000
    Date of Patent: April 16, 2002
    Assignee: Nalco Chemical Company
    Inventors: Bruce A. Keiser, Maureen B. Nunn, Cheng-Sung Huang, Dennis I. MacDonald
  • Patent number: 6372806
    Abstract: Disclosed are stable, aqueous colloidal silicas having surface area of greater than 700 m2/g and S-values of from 20-50. These colloidal silicas do not require treatment with surface treatment agents such as aluminum to achieve stability. These colloidal silica aquasols can be produced and stored at concentrations of greater than 7 percent by weight SiO2 solids, and even as high as 15 percent by weight solids or higher, and remain stable at room temperature for at least 30 days compared to art-known silica aquasols. These colloidal silica sols demonstrate advantageously improved performance over art-known colloidal silica sots in applications such as in drainage and retention in papermaking processes. Also disclosed are processes for making aqueous colloidal silicas of the invention and the use of such colloidal silicas in papermaking processes.
    Type: Grant
    Filed: February 14, 2000
    Date of Patent: April 16, 2002
    Assignee: Nalco Chemical Company
    Inventors: Bruce A. Keiser, Maureen B. Nunn, Cheng-Sung Huang, Dennis L. MacDonald
  • Patent number: 6372805
    Abstract: Colloids comprising amorphous borosilicate particles, wherein said borosilicate particles are not borosilicate glass; are described and claimed. These colloids have been found to be useful in aqueous systems, specially in papermaking.
    Type: Grant
    Filed: July 31, 2000
    Date of Patent: April 16, 2002
    Assignee: Nalco Chemical Company
    Inventors: Bruce A. Keiser, James E. Whitten
  • Patent number: 6372882
    Abstract: The present invention is a method of producing substantially dry water insoluble polymers from poly alkyl esters of vinylic monomers for use in a method for the clarification of red mud-containing liquors generated in the Bayer process for the recovery of alumina from bauxite ore. The polymers can be either homopolymers, copolymers or terpolymers. Preferably, the dried emulsion polymers are high molecular weight polymers of poly(methyl acrylate), poly(methyl acrylate/acrylic acid), poly(vinyl acetate/acrylic acid/methyl acrylate), poly(t-butyl methacrylate/acrylic acid/methyl acrylate) and poly(t-butyl acrylate/acrylic acid/methyl acrylate).
    Type: Grant
    Filed: April 3, 2000
    Date of Patent: April 16, 2002
    Assignee: Nalco Chemical Company
    Inventors: Everett C. Phillips, Ronald J. Allain