Patents Assigned to BASF Contruction Polymers GmbH
  • Fluid loss control additive and cement compositions comprising same
    Patent number: 7399355
    Abstract: A fluid loss control additive comprising a crosslinked polymer and sugar and cement compositions comprising the same. In one embodiment, the fluid loss control additive comprises a polymer and a sugar connected by a pH-sensitive crosslink. In some embodiments, the polymer is a polyvinyl alcohol, and the sugar is a sugar alcohol such as sorbitol.
    Type: Grant
    Filed: February 22, 2005
    Date of Patent: July 15, 2008
    Assignees: Halliburton Energy Services, Inc., BASF Contruction Polymers GmbH
    Inventors: Michael J. Szymanski, Samuel J. Lewis, Christian Spindler, Andrea Fenchl