Patents Assigned to Eastman ChemicalI Company
  • Production of branched polyesters
    Patent number: 5393863
    Abstract: Disclosed is an improvement in a process for producing branched polyesters wherein a precursor polyester is first formed and subsequently the precursor polyester is formed into particles and further polymerized in the solid state, wherein the improvement comprises contacting the particles while at a temperature of about 140.degree. to about 2.degree. C. below the melting point of the polyester with the vapor of water or an organic compound having at least one OH group.
    Type: Grant
    Filed: January 4, 1993
    Date of Patent: February 28, 1995
    Assignee: Eastman ChemicalI Company
    Inventors: Cheuk C. Yau, Clinton Cherry