Patents Assigned to BASF Aktiengensellschaft
  • Method for Improving a Piperazine Colour Stability
    Publication number: 20070295592
    Abstract: The present invention relates to a process for improving the color stability by postpurifying piperazine, the steps comprising preparing an aqueous piperazine solution by introducing solid or liquid piperazine having a degree of purity of at least 90% by weight in water; removing the water by distillation; isolating the piperazine with a predefined maximum residual content of water. The invention further provides a rapid test of aging for checking the improvement in the color stability.
    Type: Application
    Filed: August 3, 2005
    Publication date: December 27, 2007
    Applicant: BASF Aktiengensellschaft
    Inventors: Holger Evers, Michael Jodecke, Johann-Peter Melder, Gunther van Cauwenberge, Jan Nouwen
  • Moldable-foam moldings composed of expandable styrene polymers and mixtures with thermoplastic polymers
    Publication number: 20070112081
    Abstract: Moldable-foam moldings whose density is in the range from 10 to 100 g/l, obtainable via the fusion of prefoamed foam beads composed of expandable, pelletized thermoplastic polymer materials, comprising from 5 to 100% by weight of a styrene copolymer A), from 0 to 95% by weight of polystyrene B), and from 0 to 95% by weight of a thermoplastic polymer C) other than A) and B), and a process for producing the expandable pelletized thermoplastic polymer materials.
    Type: Application
    Filed: December 10, 2004
    Publication date: May 17, 2007
    Applicant: BASF Aktiengensellschaft
    Inventors: Klaus Hahn, Gerd Ehrmann, Joachim Ruch, Markus Allmendinger, Bernhard Schmied, Jan Holoch, Klaus Muhlbach, Michael Riethues