Patents Assigned to Hi-Tek Polymers, Inc.
  • Polycyanate esters of polyhydric phenols blended with thermoplastic polymers
    Patent number: 4902752
    Abstract: Curable compositions are made from blends of polycyanate esters of polyhydric phenols and amorphous, aromatic thermoplastic resins which are initially soluble in the polycyanate ester but which phase separate during curing of the polycyanate ester.
    Type: Grant
    Filed: October 5, 1987
    Date of Patent: February 20, 1990
    Assignee: Hi-Tek Polymers, Inc.
    Inventor: David A. Shimp
  • Hydrophobically modified non-ionic polygalactomannan ethers
    Patent number: 4870167
    Abstract: Alkyl ethers of polygalactomannans wherein the alkyl groups contain 1 to 4 carbon atoms are further modified with long chain aliphatic epoxides wherein the long chains contain 8 to about 28 carbon atoms. The resulting derivatized polygalactomannans are particularly useful as thickening agents for aqueous systems.
    Type: Grant
    Filed: March 2, 1987
    Date of Patent: September 26, 1989
    Assignee: Hi-Tek Polymers, Inc.
    Inventors: George M. Zody, Michael E. Morgan
  • Metal acetylacetonate/alkylphenol curing catalyst for polycyanate esters of polyhydric phenols
    Patent number: 4847233
    Abstract: Polycyanate esters of polyhydric phenols are cured with a liquid solution of a metal acetylacetonate in an alkylphenol. Such cured compositions are useful in structural composites, transfer molded-encapsulants, filmed structural adhesives and printed wiring boards.
    Type: Grant
    Filed: August 5, 1988
    Date of Patent: July 11, 1989
    Assignee: Hi-Tek Polymers, Inc.
    Inventor: David A. Shimp
  • Low viscosity noncrystalline dicyanate ester blends with prepolymers of dicyanate esters
    Patent number: 4839442
    Abstract: Low viscosity dicyanate esters are made from bisphenols wherein the bridging member between the phenyl groups is unsymmetrical. These dicyanate esters are blended with prepolymers of dicyanate esters to form low viscosity non-crystallizing resins useful in preparing composites.
    Type: Grant
    Filed: June 20, 1988
    Date of Patent: June 13, 1989
    Assignee: Hi-Tek Polymers, Inc.
    Inventor: Wallace M. Craig, Jr.
  • Thixotropic aqueous solutions containing a divinylsulfone-crosslinked polygalactomannan gum
    Patent number: 4752339
    Abstract: This invention provides a process for preparing a viscoelastic aqueous solution which contains divinylsulfone-crosslinked polygalactomannan gum that is formed in situ.An invention thixotropic aqueous medium is characterized by excellent heat/shear stability and high tolerance to the presence of inorganic salts.A unique property of an invention thixotropic aqueous medium is a time-dependent gradual restoration of high viscosity after cessation of high shear deformation.
    Type: Grant
    Filed: October 31, 1983
    Date of Patent: June 21, 1988
    Assignee: Hi-Tek Polymers, Inc.
    Inventor: Rachel S. Kohn
  • Reduction of viscosity of aqueous fluids
    Patent number: 4647385
    Abstract: The viscosity of thickened aqueous solutions of water-soluble polymers is reduced by the addition of alkali metal and alkaline earth metal salts of hypochlorous acid and tertiary amines. The combination of the salt and the tertiary amine is much more efficient in speed of reduction in viscosity and in the completeness of the degradation of the polymer than the use of the metal salt alone. The process of this invention is particularly useful in fracturing of oil wells.
    Type: Grant
    Filed: November 12, 1985
    Date of Patent: March 3, 1987
    Assignee: Hi-Tek Polymers, Inc.
    Inventors: Martin M. Williams, Martha A. Phelps, George M. Zody