Patents Assigned to Betz PanerChem, Inc.
  • Method for effectively breaking up latex-coated paper during pulping to decrease the potential for white pitch deposition
    Patent number: 4997523
    Abstract: A composition and method for inhibiting the deposition of white pitch on the surfaces of papermaking equipment during the processing of recycled coated broke. The process involves adding to the coated broke during repulping a composition having a first compound of a tetrafunctional alkoxylated diamine having the structure: ##STR1## wherein R.sub.1 and R.sub.2 are ethylene oxide or propylene oxide and R.sub.1 and R.sub.2 are not the same, and a second compound selected from the group consisting of a phosphate, phosphonate and phosphonic acid.
    Type: Grant
    Filed: June 20, 1990
    Date of Patent: March 5, 1991
    Assignee: Betz PanerChem, Inc.
    Inventors: Jacqueline K. Pease, Catherine S. Dixon, Daniel L. Michalopoulos