Patents Assigned to E. I. Du Pont de Nemours and Compant
  • Crystalline form of poly(ethylene 2,6-naphthalate) and a method for its production
    Patent number: 5670606
    Abstract: Disclosed herein is a novel crystalline form of low molecular weight poly(ethylene 2,6-naphthalate). This crystalline form may be produced from molten or glassy low molecular weight poly(ethylene 2,6-naphthalate) material by means of rapid heat transfer to or from the material. The poly(ethylene 2,6-naphthalate) composition is suitable for use as a starting material for solid-state polymerization in order to produce polymers of higher molecular weight.
    Type: Grant
    Filed: January 5, 1996
    Date of Patent: September 23, 1997
    Assignee: E. I. Du Pont de Nemours and Compant
    Inventors: Jan M. Stouffer, Elwood Neal Blanchard, Kenneth Wayne Leffew