Patents by Inventor Debora Frances Bergstrom

Debora Frances Bergstrom 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).

  • Method of treating precipitated calcium carbonate fillers
    Patent number: 6743509
    Abstract: Treating compositions for application to particles of a filler consist of 5-95 percent by weight of a silicon atom containing hydrophobic-type treating agent, and 5-95 percent by weight of a silicon atom containing functional-type treating agent, based on the weight of the composition. Useful functional-type treating agents include bis(alkoxysilylalkyl)polysulfides and mercaptoorganosilicon compounds. Useful hydrophobic-type treating agents include polyorganohydrogensiloxanes and silanol terminated silicone oligomers. The filler most preferred is precipitated (i.e., synthetic) calcium carbonate.
    Type: Grant
    Filed: October 1, 2002
    Date of Patent: June 1, 2004
    Assignee: Dow Corning Corporation
    Inventors: Debora Frances Bergstrom, Gary Thomas Burns, Sarah Bridget Granzo, Csilla Kollar, Clifford Carlton Reese
  • Method of treating precipitated calcium carbonate fillers
    Publication number: 20040063816
    Abstract: Treating compositions for application to particles of a filler consist of 5-95 percent by weight of a silicon atom containing hydrophobic-type treating agent, and 5-95 percent by weight of a silicon atom containing functional-type treating agent, based on the weight of the composition. Useful functional-type treating agents include bis(alkoxysilylalkyl)polysulfides and mercaptoorganosilicon compounds. Useful hydrophobic-type treating agents include polyorganohydrogensiloxanes and silanol terminated silicone oligomers. The filler most preferred is precipitated (i.e., synthetic) calcium carbonate.
    Type: Application
    Filed: October 1, 2002
    Publication date: April 1, 2004
    Inventors: Debora Frances Bergstrom, Gary Thomas Burns, Sarah Bridget Granzo, Csilla Kollar, Clifford Carlton Reese
  • Chemically modified silica fillers, process for producing, and silicone compositions containing same
    Patent number: 6384125
    Abstract: This invention is a process for making modified silica filler comprising the steps of: (A) contacting an acidic aqueous suspension of precipitated or colloidal silica, optionally in the presence of a surfactant and/or a water-miscible solvent, with a combination of (a) a functionalizing coupling agent, and (b) an organometallic hydrophobing compound in a weight ratio of (a) to (b) of at least 0.001 to 1 to form an acidic aqueous suspension of chemically treated silica filler having a pH of 2.0 or less (B) treating the acidic aqueous suspension of the chemically treated filler with an acid-neutralizing agent to increase the pH of the suspension to a range of from greater than 2.0 to 10, and (C) recovering the chemically treated filler. This invention is also modified silica filler that has a pH of from about 5.0 to 10.0, where the silica filler is made by the method of this invention.
    Type: Grant
    Filed: August 11, 2000
    Date of Patent: May 7, 2002
    Assignee: Dow Corning Corporation
    Inventors: Debora Frances Bergstrom, Lisa Marie Boswell, Mark David Fisher, James Richard Hahn, Timothy A. Okel, Clifford Carlton Reese