Patents Represented by Attorney, Agent or Law Firm Witold Andrew Ziar
  • High productivity bisphenol-A catalyst
    Patent number: 6730816
    Abstract: A high productivity catalyst for bisphenol-A has been discovered which comprises strongly acidic cation-exchange resin spheres produced from a polystyrene/divinylbenzene (PS/DVB) copolymer sulfonated under conditions to introduce sulfone cross-linking. Surprisingly, the sulfone cross-linking improves the resistance to deformation but does not have a negative effect on the activity and selectivity of the catalyst in bisphenol-A production.
    Type: Grant
    Filed: November 27, 2001
    Date of Patent: May 4, 2004
    Assignee: Rohm and Haas Company
    Inventor: Eric Gustave Lundquist