Patents by Inventor Robert T. Kazmierzak

Robert T. Kazmierzak 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).

  • Process for preparing polymer bound hindered amine light stabilizers
    Patent number: 4975489
    Abstract: Polymer bound hindered amine light stabilizers are prepared by reacting hindered amine light stabilizers containing reactive hydrazide functionalities with anhydride containing polymers or copolymers. The reactions may be carried out in an inert solvent or in a melt blending step. The polymer bound hindered amine light stabilizers are useful alone or may also be used to stabilize other polymers, copolymers or polymer blends against the deleterious effects of heat and/or light.
    Type: Grant
    Filed: June 21, 1989
    Date of Patent: December 4, 1990
    Assignee: Atochem North America, Inc.
    Inventors: Robert T. Kazmierzak, Ronald E. MacLeay
  • Polymer bound hindered amine light stabilizers
    Patent number: 4857595
    Abstract: Polymer bound hindered amine light stabilizers are prepared by reacting hindered amine light stabilizers containing reactive hydrazide functionalities with anhydride containing polymers or copolymers. The reactions may be carried out in an inert solvent or in a melt blending step. The polymer bound hindered amine light stabilizers are useful alone or may also be used to stabilize other polymers, copolymers or polymer blends against the deleterious effects of heat and/or light.
    Type: Grant
    Filed: August 12, 1987
    Date of Patent: August 15, 1989
    Assignee: Pennwalt Corporation
    Inventors: Robert T. Kazmierzak, Ronald E. MacLeay
  • Polymer bound hindered amine light stabilizers
    Patent number: RE34791
    Abstract: Polymer bound hindered amine light stabilizers are prepared by reacting hindered amine light stabilizers containing reactive hydrazide functionalities with anhydride containing polymers or copolymers. The reactions may be carried out in an inert solvent or in a melt blending step. The polymer bound hindered amine light stabilizers are useful alone or may also be used to stabilize other polymers, copolymers or polymers blends against the deleterious effects of heat and/or light.
    Type: Grant
    Filed: July 16, 1991
    Date of Patent: November 15, 1994
    Assignee: Atochem North America, Inc.
    Inventors: Robert T. Kazmierzak, Ronald E. MacLeay