Patents by Inventor Donald E. Roach

Donald E. Roach 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).

  • Methyl methacrylate compositions
    Patent number: 5466756
    Abstract: Aliphatic alcohol, and high boiling point hydroxy compound additives are added to poly methyl methacrylate to improve the ultraviolet radiation resistance of the polymer. The additives may be incorporated into the poly methyl methacrylate by including the additives with the monomers prior to polymerization. Alternatively, the additives may be incorporated into the poly methylmethacrylate by addition to polymerized methyl methacrylate.
    Type: Grant
    Filed: September 15, 1994
    Date of Patent: November 14, 1995
    Assignee: Rohm and Haas Company
    Inventors: Donald E. Roach, Paul J. Keating
  • Stabilization of methacrylic polymers against sterilizing radiation
    Patent number: 5258423
    Abstract: The present invention is directed to methacrylic polymer compositions which may be used to form plastic products which have increased resistance to discoloration by sterilizing radiation, such as gamma or electron beam irradiation. The compositions, free from conventional ultraviolet stabilizers, contain .alpha.-hydroxyacids or esters thereof.
    Type: Grant
    Filed: May 12, 1993
    Date of Patent: November 2, 1993
    Assignee: Rohm and Haas Company
    Inventors: Charles C. Crabb, Robert A. Wanat, Paul J. Keating, Donald E. Roach
  • Stabilization of methacrylic polymers against sterilizing radiation
    Patent number: 5250589
    Abstract: The present invention is directed to methacrylic polymer compositions which may be used to form plastic products which have increased resistance to sterilizing radiation, such as gamma or electron beam irradiation.
    Type: Grant
    Filed: December 10, 1992
    Date of Patent: October 5, 1993
    Assignee: Rohm and Haas Company
    Inventors: Paul J. Keating, Donald E. Roach
  • Stabilization of methacrylic polymers against sterilizing radiation
    Patent number: 5216060
    Abstract: The present invention is directed to methacrylic polymer compositions which may be used to form plastic products which have increased resistance to sterilizing radiation, such as gamma or electron beam irradiation.
    Type: Grant
    Filed: August 28, 1991
    Date of Patent: June 1, 1993
    Assignee: Rohm and Haas Company
    Inventors: Paul J. Keating, Donald E. Roach
  • Stabilization of methacrylic polymers against sterilizing radiation
    Patent number: 5102940
    Abstract: The present invention is directed to methacrylic polymer compositions which may be used to form plastic products which have increased resistance to sterilizing radiation, such as gamma or electron beam irradiation.
    Type: Grant
    Filed: March 26, 1990
    Date of Patent: April 7, 1992
    Assignee: Rohm and Haas Company
    Inventors: Paul J. Keating, Donald E. Roach
  • Methyl methacrylate compositions
    Patent number: 5061747
    Abstract: Aliphatic alcohol, and high boiling point hydroxy compound additives are added to poly methyl methacrylate to improve the ultraviolet radiation resistance of the polymer. The additives may be incorporated into the poly methyl methacrylate by including the additives with the monomers prior to polymerization. Alternatively, the additives may be incorporated into the poly methylmethacrylate by addition to polymerized methyl methacrylate.
    Type: Grant
    Filed: August 30, 1990
    Date of Patent: October 29, 1991
    Assignee: Rohm and Haas Company
    Inventors: Donald E. Roach, Paul J. Keating