Patents Examined by Earl A. Neilsen
  • Patent number: 5070174
    Abstract: Disclosed in a polyamide epoxy ester resin having a weight average molecular weight of 1,000 to 100,000, an epoxy equivalent of 500 to 10,000, and an acid value of not greater than 10, which is prepared by reacting(i) at least one epoxy resin which is a glycidyl ether of a dihydric phenol,(ii) at least one dihydric phenol and(iii) a polyamide dicarboxylic acid having an amine value of not greater than 20 and an acid value of at least 20, which is prepared by reacting a polymerized fatty acid composed mainly of a dimer acid with a diamine at a polymerized fatty acid/diamine molar ratio of from 2/1.0 to 2/1.9,at a ratio of such that the amount of the polyamide dicarboxylic acid segment in the resin ranges 1 to 30 percent by weight based on the weight of the resin.Also, disclosed are a process for preparing the polyamide epoxy ester resin and a coating composition comprising the resin. The coating composition is particularly useful for can coating.
    Type: Grant
    Filed: December 31, 1990
    Date of Patent: December 3, 1991
    Assignee: The Dow Chemical Company
    Inventor: Kaoru Ohba
  • Patent number: 5021516
    Abstract: This invention concerns novel polymeric perfluoroether acyl peroxides and an improved process for making them.
    Type: Grant
    Filed: June 26, 1989
    Date of Patent: June 4, 1991
    Assignee: E. I. Du Pont de Nemours and Company
    Inventor: Robert C. Wheland
  • Patent number: 4973631
    Abstract: Epoxy resins can be cured or crosslinked with triphenyl phosphine oxide compounds having epoxy-reactive (active hydrogen) substituents either alone or in combination with amine-terminated polyarylene ethers (e.g., amine-terminated polysulfone oligomers or high polymers.
    Type: Grant
    Filed: October 6, 1989
    Date of Patent: November 27, 1990
    Assignee: Virginia Tech Intellectual Properties Inc.
    Inventors: James E. McGrath, Attila Gungor
  • Patent number: 4906711
    Abstract: The viscosities of solventless compositions of epoxy resins containing 1,2 epoxy groups and having at least two epoxide groups per molecule and effective amounts of hardener are markedly reduced whereby they are useful for vacuum-pressure impregnation, pre-impregnation electrical insulating material and structural composite applications by addition of a reactive diluent comprising an aromatic vinyl monomer.
    Type: Grant
    Filed: July 29, 1988
    Date of Patent: March 6, 1990
    Assignee: General Electric Company
    Inventor: Mark Markovitz
  • Patent number: 4292216
    Abstract: A glue, substantially based on chlorolignin, for gluing cellulose materials such as wood, particle board etc. Chlorolignin, which is a waste product from the cellulose industry, is an environmentally dangerous substance. It is recovered by membrane filtering of waste liquor, separating out compounds with a molecular weight lower than 1000-2000. It is then used alone, or mixed with common synthetic glues such as melamine-formaldehyde resins, fillers, hardeners etc. Formaldehyde, paraldehyde or ammonium chloride are suitable hardeners and the chlorolignin can also be prepolymerized with formaldehyde and/or paraldehyde.
    Type: Grant
    Filed: December 11, 1979
    Date of Patent: September 29, 1981
    Assignee: Eka Aktiebolag
    Inventors: Kurt H. Grunewald, Inge G. Mansson