Patents Represented by Attorney Elaine M. Ramesh
  • Patent number: 5880237
    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: December 4, 1997
    Date of Patent: March 9, 1999
    Assignee: Nalco Chemical Company
    Inventors: Christopher P. Howland, Kevin J. Moeggenborg, John D. Morris, Peter E. Reed, Jiansheng Tang, Jin-Shan Wang
  • Patent number: 5866521
    Abstract: The invention is for an additive composition for metal-working fluids and a method for producing the additive composition. The additive composition comprises from about 0.01 to about 25.0 mole weight of iso-stearic acid to 2-amino-2-methyl-1-propanol whereby a salt of iso-stearic acid-2-amino-2-methyl-1-propanol is formed. The metal-working fluid composition comprises from about 0.01 to about 40 percent by weight of iso-stearic acid-2-amino-2-methyl-1-propanol salt and from about 99.99 to about 60 percent by weight of a synthetic or semi-synthetic metal-working fluid.
    Type: Grant
    Filed: September 5, 1995
    Date of Patent: February 2, 1999
    Assignee: Nalco Chemical Company
    Inventor: Robert L. Trivett
  • Patent number: 5840158
    Abstract: A method for the manufacture of paper comprising the steps of:a) forming an aqueous cellulosic papermaking slurry;b) adding an effective coagulating amount of a coagulant and a flocculant to said cellulosic papermaking slurry, wherein said coagulant is prepared by blendingi) an effective coagulating amount of an aqueous conditioned colloidal silica sol with an average particle size within the range of from 1 to 150 nm and wherein the aqueous colloidal silica sol is conditioned by contacting said sol with a strong acid cation exchange resin, andii) an effective coagulating amount of a cationically-charged water-soluble polymeric coagulant;c) draining said cellulosic suspension to form a sheet; and,d) drying said sheet.The components of the invention are blended together so that addition is simultaneous. The colloidal silica is conditioned by passing over a cationic exchange resin prior to addition of cationic polymer.
    Type: Grant
    Filed: April 7, 1997
    Date of Patent: November 24, 1998
    Assignee: Nalco Chemical Company
    Inventors: Pek Lee Choo, Bruce A. Keiser, Michio Kobayashi, Maureen B. Nunn, David A. Picco, Kristine S. Salmen
  • Patent number: 5837215
    Abstract: A method for flocculation of red mud in Bayer Process streams utilizing a fatty acid or fatty acid ester free latex polymer flocculant. Preferred fatty acid free emulsifiers useful for the preparation of such flocculants are obtained by reacting ethylene and/or propylene oxide with a reagent selected from the group consisting of ethylene diamine, ethanol and ethylene glycol.
    Type: Grant
    Filed: July 18, 1997
    Date of Patent: November 17, 1998
    Assignee: Nalco Chemical Company
    Inventors: James Morton Tippett, Graeme John Farquarson, Radhakrishnan Selvarajan, John T. Malito
  • Patent number: 5808103
    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: November 21, 1997
    Date of Patent: September 15, 1998
    Assignee: Nalco Chemical Company
    Inventors: William J. Ward, Jeffrey R. Cramm, Peter E. Reed, Brian S. Johnson
  • Patent number: 5800714
    Abstract: Water recovered from the polymerization of vinyl monomers can be treated to remove or deactivate chain transfer agents present in the water allowing resuse in polymerization processes. The water recovered from a vinyl polymerization reaction is contacted with a cation exchange resin in the hydrogen form prior to recycle, or may be acidified and then contacted with an anion exchange resin in the hydroxide form.
    Type: Grant
    Filed: October 21, 1996
    Date of Patent: September 1, 1998
    Assignee: Nalco Chemical Company
    Inventors: Thomas M. Miller, Bhasker B. Dave, W. Hugh Goodman
  • Patent number: 5798023
    Abstract: A method for minimizing pitch, ink, and stickies particle deposits in the paper making process by causing the retention of such particles onto fiber, comprising the steps of adding an effective pitch, ink, and stickies controlling amount of talc to a suspension of fiber in contact with the paper machine and associated parts and adding an effective pitch, ink, and stickies controlling amount of bentonite to the suspension, thereby increasing retention of pitch, ink, and stickies onto the fiber and minimizing the deposition of pitch, ink, and stickies particles on the paper machine and associated parts.
    Type: Grant
    Filed: May 14, 1996
    Date of Patent: August 25, 1998
    Assignee: Nalco Chemical Company
    Inventors: Przemyslaw Pruszynski, John R. Armstrong
  • Patent number: 5788866
    Abstract: The invention is a water-soluble N,N-diallyl-N-alkyl-N-(sulfoalkyl) ammonium betaine containing copolymer, wherein said copolymer is formed from the polymerization of an N,N-diallyl-N-alkyl-N-(sulfoalkyl) ammonium betaine of the formula: ##STR1## wherein R is selected from the group consisting of alkyl and aryl groups, and R.sub.1 is selected from the group consisting of alkyl groups, aryl groups, and alkylaryl groups, and an anionic monomer.The invention is also a method of inhibiting the precipitation and deposition of scale on metal surfaces in contact with industrial cooling waters comprising the addition of an effective, scale-inhibiting amount of a water-soluble N,N-diallyl-N-alkyl-N-(sulfoalkyl) ammonium betaine containing copolymer, wherein said copolymer is formed from the polymerization of a betaine of the formula: ##STR2## wherein R is selected from the group consisting of alkyl and aryl groups, and R.sub.
    Type: Grant
    Filed: September 19, 1996
    Date of Patent: August 4, 1998
    Assignee: Nalco Chemical Company
    Inventors: Dodd W. Fong, Charles F. Marth, Ronald V. Davis
  • Patent number: 5788857
    Abstract: This invention relates to the use of iminoalkylenephosphonic acids to prevent corrosion, including both localized corrosion and general corrosion on iron based metal surfaces in contact with a corrosive system water in an aqueous system. The invention also relates to the use of the iminoalkylenephosphonic acids to control formation, deposition and adherence of scale at the surfaces of metals in contact with a scale-forming system water in an aqueous system.
    Type: Grant
    Filed: October 23, 1996
    Date of Patent: August 4, 1998
    Assignee: Nalco Chemical Company
    Inventors: Bo Yang, Jiansheng Tang
  • Patent number: 5783109
    Abstract: Gums and inorganic corrosion byproducts occurring in distilled petroleum fractions may be dispersed and resulting fouling controlled by adding to the petroleum distillate an effective dispersing amount of a monosubtituted alkylphenol polyethylenepolyamine-formaldehyde resin, such resins having a weight average molecular weight of from about 1,000 to about 10,000, and an alkyl substituent containing from about 4 to about 24 carbon atoms, which alkyl substituent may be a linear or branched.
    Type: Grant
    Filed: August 21, 1996
    Date of Patent: July 21, 1998
    Assignee: Nalco/Exxon Energy Chemicals, L.P.
    Inventor: Kailash N. Sawhney
  • Patent number: 5783728
    Abstract: An improved method is disclosed for the preparation of novel alkali metal diphosphinate salts by the reaction of an acetylenic compound with an alkali metal hypophosphite in the presence of a free radical source, the use of these novel compounds in further reactions to prepare diphosphonate compounds and diphosphinate containing adducts, oligomers and polymers and utilization of these compounds, polymers and oligomers to control calcium carbonate scale and mild steel corrosion in cooling water.
    Type: Grant
    Filed: January 7, 1997
    Date of Patent: July 21, 1998
    Assignee: Nalco Chemical Company
    Inventors: James F. Kneller, Donald A. Johnson, Vytas Narutis, Binaifer S. Khambatta
  • Patent number: 5770041
    Abstract: The invention is a method of inhibiting the formation of fouling deposits occurring on the surface of an alkaline scrubber used to remove acid gases, such as hydrogen sulfide, carbon dioxide and mercaptans, from hydrocarbon streams. These deposits are formed during the scrubbing of pyrolytically produced hydrocarbons contaminated with oxygen-containing compounds with a caustic solution having a pH>7 which comprises adding an effective deposit-inhibiting amount of a non-enolizable carbonyl compound to the caustic solution. The invention is also a method of inhibiting the formation of fouling deposits occurring in spent caustic wash/stripper systems used for hydrocarbon manufacturing processes. Fouling occurs in these systems when they are in contact with hydrocarbon processing streams contaminated with oxygen-containing compounds, such as aldehydes.
    Type: Grant
    Filed: February 21, 1997
    Date of Patent: June 23, 1998
    Assignee: Nalco/Exxon Energy Chemicals, L.P.
    Inventors: Vincent E. Lewis, Robert D. McClain, Michael K. Poindexter