Patents Assigned to Nalco Chemical Company
  • Starch/cationic polymer combinations as coagulants for the mining industry
    Patent number: 6042732
    Abstract: A method for dewatering coal tailings, clean coal products and mineral slurries with an effective coagulating amount of a combination of a cationic polymer and a starch. A preferred cationic polymer is poly(dimethylaminoethylacrylate methyl chloride quaternary salt) and preferred starches are unmodified.
    Type: Grant
    Filed: April 15, 1999
    Date of Patent: March 28, 2000
    Assignee: Nalco Chemical Company
    Inventors: Jeffrey A. Jankowski, Calvin T. Tobison
  • Water continuous methyl acrylate emulsion polymers for improved flocculation of red mud in the Bayer process
    Patent number: 6036869
    Abstract: A method for improving the flocculation of suspended solids in a Bayer process liquor in a primary settler stage. The method includes the step of adding to a primary settler feed a composition including water-continuous polymer, said polymer being hydrolyzable in a Bayer process liquor to an acid form, said acid form being an active red mud flocculent. A novel emulsion, and a polymerization technique for obtaining high molecular weight emulsions are also disclosed.
    Type: Grant
    Filed: December 12, 1997
    Date of Patent: March 14, 2000
    Assignee: Nalco Chemical Company
    Inventors: Radhakrishnan Selvarajan, Everett C. Phillips
  • Use of hydrophilic dispersion polymers for oily wastewater clarification
    Patent number: 6036868
    Abstract: A method for removing emulsified oil from industrial waste water streams utilizing dispersion copolymers is disclosed. Preferred dispersion copolymers are poly(dimethylaminoethylacrylate methyl chloride quaternary salt/acrylamide) and poly (diallyldimethyl ammonium chloride/acrylamide).
    Type: Grant
    Filed: July 23, 1998
    Date of Patent: March 14, 2000
    Assignee: Nalco Chemical Company
    Inventors: Ananthasubramanian Sivakumar, Patrick Gerard Murray
  • Selective retention of filling components and improved control of sheet properties by enhancing additive pretreatment
    Patent number: 6033524
    Abstract: A method for increasing retention and drainage of filling components in a paper making furnish in a paper making process comprising the steps of: making a slurry of filling components, treating the slurry with from about 0.003% to about 2.0% by weight based on total solids of a phenolic enhancer to form a pretreated filling components slurry, adding to the furnish the pretreated slurry and adding to the furnish from about 0.003 to about 0.5% by weight based on total solids in the slurry of a polymeric flocculent, whereby retention and drainage of filling components in the paper making furnish is increased. A preferred enhancer is a condensate of phenol and formaldehyde and preferred flocculants contain acrylamide, methacrylamide, and/or N-vinylformamide.
    Type: Grant
    Filed: November 24, 1997
    Date of Patent: March 7, 2000
    Assignee: Nalco Chemical Company
    Inventors: Przemyslaw Pruszynski, Regina Jakubowski, John R. Armstrong, Scott W. Rosencrance
  • Process for preparing hydrophilic dispersion polymers for treating wastewater
    Patent number: 6025426
    Abstract: Hydrophilic cationic copolymers of acrylamide are prepared as dispersions in a salt media. These polymers have high molecular weights and are readily activated by diluting in water. These polymers are useful flocculants for such applications as sludge dewatering, raw water clarification aids, emulsion breakers and waste water clarification aids.
    Type: Grant
    Filed: December 18, 1995
    Date of Patent: February 15, 2000
    Assignee: Nalco Chemical Company
    Inventor: John R. Hurlock
  • Biodegradable modified polyaspartic polymers for corrosion and scale control
    Patent number: 6022401
    Abstract: Several copolymers of aspartic acid and another monomer provide effective mild steel corrosion inhibitors and scale formation inhibitors under oil field conditions. The copolymers are polymers of modified polyaspartic acid mer units and polyaspartic acid mer units. The resulting polymers are biodegradable.
    Type: Grant
    Filed: April 17, 1998
    Date of Patent: February 8, 2000
    Assignee: Nalco Chemical Company
    Inventors: Jiansheng Tang, Shi-Liang Fu, Daniel H. Emmons
  • System and method to monitor for fouling
    Patent number: 6023070
    Abstract: A system and a method for monitoring fouling in a fluid stream are provided. A light source generates a light path directed to two distinct portions of a fluid stream, one of which includes a translucent conduit. The conduit experiences fouling on the walls thereof. The light directed towards the conduit is absorbed or scattered to a varying degree as a function of foulant thickness and composition and the wavelength of the light employed. A comparison of foulant contained in the fluid itself may be compared to the foulant in the conduit, and a signal representative thereof can be generated. As a result, dosage of agents added to the fluid stream to control the foulant in the system may be controlled.
    Type: Grant
    Filed: April 3, 1998
    Date of Patent: February 8, 2000
    Assignee: Nalco Chemical Company
    Inventors: Robert L. Wetegrove, Rodney H. Banks
  • Hydrophilic dispersion polymers of diallyldimethyl ammonium chloride and acrylamide for the clarification of deinking process waters
    Patent number: 6019904
    Abstract: The invention comprises a method for clarifying ink-laden water obtained from the recycling of paper stocks by treating said water with a hydrophilic dispersion polymer. The hydrophilic dispersion polymer of the invention is a copolymer of a diallyl N,N-disubstituted ammonium halide cationic monomer and (meth)acrylamide (AcAm). Following dosing with the polymer, a floc is formed. The floc contains ink and impurities which are removed from the water process stream by means of solid liquid separation; the solid liquid separation comprising a dissolved air flotation method. A preferred copolymer is formed from DADMAC and AcAm.
    Type: Grant
    Filed: December 5, 1997
    Date of Patent: February 1, 2000
    Assignee: Nalco Chemical Company
    Inventors: Jane B. Wong Shing, Karen R. Tubergen
  • Apparatus and method for the monitoring of membrane deposition
    Patent number: 6017459
    Abstract: An in-line apparatus for monitoring membrane deposition is provided having an exterior body that defines an interior compartment for receiving a fluid stream. A coupon rack is positioned in the interior compartment and suspends at least one coupon holder. The coupon holder holds at least one membrane for collection of deposition present within a filtration system. The apparatus allows examination of membrane surface deposition without sacrificing a membrane element and also provides timely diagnostic information on a filtration system. The present invention also provides a method of monitoring membrane deposition as well as a filtration system incorporating an in-line apparatus for monitoring membrane deposition.
    Type: Grant
    Filed: March 8, 1993
    Date of Patent: January 25, 2000
    Assignee: Nalco Chemical Company
    Inventors: E. H. Kelle Zeiher, Brian F. Post, William F. McCoy, Timothy L. Chaffin
  • Utility of water-soluble polymers having pendant derivatized amide functionalities for scale control
    Patent number: 6017994
    Abstract: Methods for preventing corrosion and scale deposition in aqueous media are disclosed. The methods utilize water-soluble polymers having pendant derivatized amide functionalities for scale inhibition.
    Type: Grant
    Filed: June 27, 1997
    Date of Patent: January 25, 2000
    Assignee: Nalco Chemical Company
    Inventors: Phillip W. Carter, John D. Morris, Peter E. Reed, Jiansheng Tang, Jin-Shan Wang, Paul R. Young
  • Stable oxidizing bromine formulations, methods of manufacture thereof and methods of use for microbiofouling control
    Patent number: 6007726
    Abstract: Stable oxidizing biocide formulations containing 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 primary or secondary biocide in an industrial water system.
    Type: Grant
    Filed: April 29, 1998
    Date of Patent: December 28, 1999
    Assignee: Nalco Chemical Company
    Inventors: Shunong Yang, William F. McCoy
  • Papermaking process
    Patent number: 6007679
    Abstract: The invention relates to a paper making process in which improved drainage and retention is obtained by the addition of an effective amount of a cationic dispersion polymer to an aqueous cellulosic paper making slurry prior to shearing the slurry; which cationic dispersion polymer is selected from a group of copolymers consisting of:i) a copolymer of about 10 mole % DMAEA.BCQ and about 90 mole % AcAm;ii) a copolymer of about 10 mole % DMAEA.MCQ and about 90 mole % AcAm; andiii) a copolymer of about 20 mole % DMAEA.MCQ and about 80 mole % AcAm; andadding to the slurry, after said cationic dispersion polymer is added and the slurry is sheared,a microparticle selected from the group consisting ofa) copolymers of acrylic acid and acrylamide;b) bentonite; andc) dispersed silica.
    Type: Grant
    Filed: October 14, 1998
    Date of Patent: December 28, 1999
    Assignee: Nalco Chemical Company
    Inventors: R. Nagarajan, Jane B. Wong Shing
  • Preparation and utility of water-soluble polymers having pendant derivatized amide, ester or ether functionalities as ceramics dispersants and binders
    Patent number: 6005040
    Abstract: Methods for dispersing and binding ceramic materials in aqueous media are disclosed. The methods utilize water-soluble polymers having pendant derivatized amide, ester or ether functionalities for dispersing and binding various classes of ceramic materials.
    Type: Grant
    Filed: November 5, 1998
    Date of Patent: December 21, 1999
    Assignee: Nalco Chemical Company
    Inventors: Christopher P. Howland, Kevin J. Moeggenborg, John D. Morris, Peter E. Reed, Jiansheng Tang, Jin-Shan Wang
  • High melt point solid film prelube emulsion for use on aluminum and other metals
    Patent number: 6001784
    Abstract: A solid film prelubricant composition comprising a fatty acid amide-in-water emulsion including from about 0.10 to about 10.0 wgt % of a hydroxystearamide wax selected from the group consisting of N-(2-hydroxyethyl)-12-hydroxystearamide and N,N'-ethylene-bishydroxystearamide; from about 0.2 to about 7 wgt % emulsifier having an HLB number of at least 8; and from about 85 to about 95 wgt % water.
    Type: Grant
    Filed: October 5, 1993
    Date of Patent: December 14, 1999
    Assignee: Nalco Chemical Company
    Inventor: Robert L. Trivett
  • Derivatized Rhodamine dye and its copolymers
    Patent number: 5998632
    Abstract: Disclosed are the Rhodamine B esters of hydroxy C.sub.2 -C.sub.6 lower alkyl acrylates. Specifically, the hydroxy lower alkyl radical is a linear hydroxy lower alkyl radical having the hydroxy group attached to the terminal carbon atom. Also shown are copolymers of diallyldimetyl ammonium chloride which contains from 0.01-2 mole percent of these Rhodamine B esters and their use in treating industrial waters.
    Type: Grant
    Filed: June 12, 1998
    Date of Patent: December 7, 1999
    Assignee: Nalco Chemical Company
    Inventors: William J. Ward, Jeffrey R. Cramm, Peter E. Reed, Brian S. Johnson
  • Method of using polyammonium quaternary for controlling anionic trash and pitch deposition in pulp containing broke
    Patent number: 5989392
    Abstract: A method is disclosed for controlling anionic trash and pitch deposition and treating coated broke which comprises the step of adding a polyammonium quaternary to a pulp and papermaking system. The polyammonium quaternary, which may be either branched or crosslinked, comprises at least one cationic monomer, preferably diallyldimethylammonium chloride, and at least one branching or crosslinking monomer, preferably N,N,N-triallylamine or N,N,N-triallylamine hydrochloride.
    Type: Grant
    Filed: September 10, 1997
    Date of Patent: November 23, 1999
    Assignee: Nalco Chemical Company
    Inventors: Jiansheng Tang, Jeffrey R. Cramm, Michael R. St. John, Laura M. Sherman
  • Fluorescent water soluble polymers
    Patent number: 5986030
    Abstract: A cationic water-soluble polymer comprising from 0.001 to 10 mole percent of a repeating mer unit represented by the formula ##STR1## wherein a is an integer of from 1 to 10, R.sub.1 is selected from the group consisting of hydrogen and methyl groups, R.sub.2 and R.sub.3 are methyl groups, fluor is a fluorescing moiety and X is selected from the group consisting of chloride, iodide and bromide ions and wherein the polymer also contains from 90 to 99.
    Type: Grant
    Filed: April 15, 1997
    Date of Patent: November 16, 1999
    Assignee: Nalco Chemical Company
    Inventors: Patrick G. Murray, Wesley L. Whipple
  • Method and composition for inhibiting growth of microorganisms including peracetic acid and a non-oxidizing biocide
    Patent number: 5980758
    Abstract: The present invention provides a composition and method of administering same for inhibiting the growth of microorganisms. The composition of the present invention includes sufficient amounts of peracetic and a non-oxidizing biocide. The method of the present invention includes the step of adding sufficient amounts of peracetic acid and the non-oxidizing biocide to industrial process waters.
    Type: Grant
    Filed: June 15, 1998
    Date of Patent: November 9, 1999
    Assignee: Nalco Chemical Company
    Inventors: Judy G. LaZonby, Robert E. McCarthy, Nancy L. Casselman
  • Non-Phosphorus corrosion inhibitor program for air washer system
    Patent number: 5976414
    Abstract: The prevention of corrosion on the surfaces of airwasher systems and particularly systems containing low levels of hardness is controlled utilizing a corrosion inhibiting amount of a composition including an alkali metal silicate, a hydroxycarboxylic acid or its water soluble salts, a polyacrylate or its water soluble salts, and a water soluble polymer which acts as a dispersant. Superior corrosion inhibition is achieved using the compositions of this invention as corrosion inhibitors, particularly in industrial airwasher systems employing mild steel metallurgy.
    Type: Grant
    Filed: October 24, 1997
    Date of Patent: November 2, 1999
    Assignee: Nalco Chemical Company
    Inventors: Binaifer S. Bedford, Daniel A. Meier
  • System and method for measuring scale deposition including a tuning fork for use in the system and the method
    Patent number: 5969235
    Abstract: A system and a method for measuring scale deposition in a process system are provided. Also, a tuning fork used as a sensor for measuring scale deposition and the process that is used with the system and method are also set forth. The tuning fork detects vibrations which have a virtually linear relationship with the scale deposition on the tuning fork. The change in frequency of vibration is, therefore, measured and may be monitored and used to change a signal which, in turn, may run or control a pump for adding necessary components, such as anti-scalant products, to the process stream. The resulting measurement is conducted in real time and, therefore, scale formation in a mineral processing system or other system in which the tuning fork is implemented may also be conducted in real time.
    Type: Grant
    Filed: July 2, 1998
    Date of Patent: October 19, 1999
    Assignee: Nalco Chemical Company
    Inventor: Graeme Allan