Patents Assigned to Process Evaluation & Development Corp.
  • Method for preparing bagasse dissolving pulps and producing rayon having a degree of polymerization of at least 800 therefrom
    Patent number: 4199399
    Abstract: A dissolving pulp suitable for preparing rayon having a degree of polymerization of greater than about 800 can be produced using bagasse by a sodium hydroxide-sodium sulfite digestion at a ph of about 10.5 to 11.5 and preferably about 10.8 to 11.2 and a caustic-sulfite weight ratio of 1:1 to 1:3 followed by a bleaching sequence of DcEDH or DcEDD. This results in a high purity low silica content fiber which has undergone very little degradation.
    Type: Grant
    Filed: October 25, 1978
    Date of Patent: April 22, 1980
    Assignee: Process Evaluation & Development Corp.
    Inventor: Eduardo J. Villavicencio