Patents Represented by Attorney James T. Mullen
  • Patent number: 7678945
    Abstract: A process for preparing derivatized poly(4-hydroxystyrene) having a novolak type structure which comprises the steps of (i) supplying a solution of methanol containing 4-hydroxyphenylmethylcarbinol, (ii) subjecting said solution to an acid catalyzed displacement reaction for a sufficient period of time and under suitable conditions of temperature and pressure to convert substantially all of said carbinol to 4-hydroxyphenylmethylcarbinol methyl ether in solution, (iii) polymerizing said ether containing solution in the presence of a suitable acid catalyst for a sufficient period of time and under suitable conditions of temperature and pressure to form a novolak type polymer.
    Type: Grant
    Filed: April 7, 2008
    Date of Patent: March 16, 2010
    Assignee: Dupont Electronic Polymers L.P.
    Inventors: Michael T. Sheehan, Edward G. Zey