Patents Assigned to Polyphalt LLC
  • Patent number: 6429241
    Abstract: Polymer modified bituminous compositions which are stable against phase separation are provided at greater levels of incorporation of elastomeric polymer having a conjugated diene structure, such as styrene-butadiene rubbers, and/or cross-linking agent, specifically sulfur, by incremental addition of elastomeric polymer and/or cross-linking agent into the bitumen at elevated temperatures of about 150° to about 220° C.
    Type: Grant
    Filed: December 2, 1999
    Date of Patent: August 6, 2002
    Assignee: Polyphalt LLC
    Inventor: Zhi-Zhong Liang