Patents by Inventor Alice C. Eng

Alice C. Eng has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Urethane-acrylic copolymer thickening compositions for aqueous systems
    Patent number: 6069217
    Abstract: Thickening composition are produced by linking a polyurethane comprising polyisocyanates, polyether polyols, modifying agents and capping agents with an alkali swellable copolymer comprising ethylenically unsaturated carboxylic acid monomers and nonionic vinyl monomers through a connecting monomer having a polymerizable double bond and a hydrogen active group. The thickening composition are used to provide improved viscosity control, flow and leveling to aqueous systems such as paints and coatings, inks, drilling fluids, adhesives, construction materials, personal care and housedhold products.
    Type: Grant
    Filed: March 7, 1997
    Date of Patent: May 30, 2000
    Assignee: Rheox, Inc.
    Inventors: Hemi N. Nae, Alice C. Eng
  • Organoclay compositions containing two or more cations and one or more organic anions, their preparation and use in non-aqueous systems
    Patent number: 5429999
    Abstract: A novel organophilic clay gellant comprising the reaction product of:(a) a smectite clay having a cation exchange capacity of at least 75 milliequivalents per 100 grams of natural clay without impurities;(b) a first organic cation in an amount of from about 75% to about 150% of the cation exchange capacity of the smectite clay;(c) a second organic cation provided by a polyalkoxylated quaternary ammonium salt; and(d) one or more organic anion(s) that is capable of reacting with said first and second organic cations, to form an organic cation-organic anion complex with said smectite clay.The organophilic clay gellant is used in a non-aqueous fluid system such as paints, inks, and coatings to provide improved theological properties.
    Type: Grant
    Filed: May 11, 1994
    Date of Patent: July 4, 1995
    Assignee: Rheox, Inc.
    Inventors: Hemi N. Nae, William W. Reichert, Alice C. Eng
  • Organoclay compositions prepared with a mixture of two organic cations and their use in non-aqueous systems
    Patent number: 5336647
    Abstract: An organophilic clay comprising the reaction product of:(a) a smectite-type clay;(b) a first organic cation in an amount of from about 75% to about 150% of the cation exchange capacity of the smectite-type clay; and(c) a second organic cation provided by a polyalkoxylated quaternary ammonium salt; wherein the second organic cation is present in an amount of from about 0.01% to about 20% by weight of the total organic cation content.
    Type: Grant
    Filed: November 14, 1991
    Date of Patent: August 9, 1994
    Assignee: Rheox, Inc.
    Inventors: Hemi N. Nae, William W. Reichert, Alice C. Eng