Patents by Inventor W. Ronald Darnell

W. Ronald Darnell 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).

  • Poly(ester-ether) compositions having increased thermal stability
    Patent number: 5342902
    Abstract: The present invention relates to poly(ester-ether) compositions and to a process for their preparation. In particular, the invention relates to poly(ester-ether) compositions obtained by reacting a polyester which is prepared from a dicarboxylic acid and an aliphatic diol with a dihydroxy aromatic compound in the presence of a metal catalyst. Incorporation of the dihydroxy aromatic compound into the polyester chain causes an increase in the Tg value and increases the thermal stability of the polyester. These poly(ester-ether) compositions are useful in molded articles of all types.
    Type: Grant
    Filed: September 7, 1993
    Date of Patent: August 30, 1994
    Assignee: Eastman Chemical Company
    Inventors: W. Ronald Darnell, W. J. Jackson, Jr.
  • Poly (ether-ketone)
    Patent number: 5155203
    Abstract: Disclosed is a poly(ether-ketone) having an inherent viscosity of at least 0.4 and consisting of the repeating unit ##STR1## wherein each Ph is 1,4-phenylene. The poly(ether-ketone) is derived from two specific reactants, 1,3-bis-(4-phenoxybenzoyl)benzene and 4,4'-oxydibenzoic acid which may be reacted in the presence of methanesulfonic acid and phosphorus pentoxide.
    Type: Grant
    Filed: September 27, 1989
    Date of Patent: October 13, 1992
    Assignee: Eastman Kodak Company
    Inventors: W. Ronald Darnell, Winston J. Jackson, Jr.
  • Melt phase polyarylate process
    Patent number: 5006628
    Abstract: A process for preparing a polyarylate by heating in the melt phase in the presence of a 4-dialkylaminopyridine, an acid anhydride which is in the range of stoichiometric amount to 25% molar excess, bisphenol-A and a dicarboxylic acid selected from the group consisting of isophthalic acid and mixtures of isophthalic acid and terephthalic acid wherein the ratio of isophthalic acid to terephthalic acid is in the range of 100:0 to 25:75.
    Type: Grant
    Filed: August 15, 1990
    Date of Patent: April 9, 1991
    Assignee: Eastman Kodak Company
    Inventors: Winston J. Jackson, Jr., W. Ronald Darnell, Bruce C. Bell, Marc A. Strand
  • Polycarbonate of cyclohexylhydroquinone
    Patent number: 4895923
    Abstract: Disclosed are polycarbonates of cyclohexylhydroquinone having the recurring units: ##STR1## and copolycarbonates of cyclohexylhydroquinone having the recurring units: ##STR2## The polycarbonates and copolycarbonates of cyclohexylhydroquinone are characterized by their excellent solubility at high solids levels and absence of crystallization problems when used in solutions at high concentrations.
    Type: Grant
    Filed: May 31, 1988
    Date of Patent: January 23, 1990
    Assignee: Eastman Kodak Company
    Inventors: W. Ronald Darnell, Winston J. Jackson, Jr.
  • Process for the preparation of polyketone and poly(ketone-sulfone) polymers
    Patent number: 4861856
    Abstract: Disclosed is an improved process for the preparation of polyketone and poly(ketone-sulfone) polymers by the reaction of at least one dicarboxylic acid with certain aromatic compounds containing at least four benzene residues in the presence of a perfluoroalkylsulfonic acid and (1) an oxide of phosphorus and/or (2) a perhaloalkanoic anhydride.
    Type: Grant
    Filed: September 6, 1988
    Date of Patent: August 29, 1989
    Assignee: Eastman Kodak Company
    Inventors: W. Ronald Darnell, Winston J. Jackson, Jr.
  • Process for the preparation of poly(ether-ketone) polymers
    Patent number: 4839459
    Abstract: Disclosed is an improved process for the preparation of poly(ether-ketone) polymers by the reaction of at least one dicarboxylic acid with certain bis(phenoxybenzoyl) compounds in the presence of a perfluoroalkylsulfonic acid and (1) an oxide of phosphorus and/or (2) a perhaloalkanoic anhydride.
    Type: Grant
    Filed: June 27, 1988
    Date of Patent: June 13, 1989
    Assignee: Eastman Kodak Company
    Inventors: W. Ronald Darnell, Winston J. Jackson, Jr.