Patents Examined by C. Azpura
  • Silated polysaccharide process
    Patent number: 5071978
    Abstract: Silated polysaccharides having 0.005 to 2.0 silyl molar substitution per anhydrosaccharide unit form water resistant films when cast from aqueous solution and dried in the presence of atmospheric carbon dioxide. These films are soluble in aqueous caustic. A preferred water soluble polymer is a cellulose ether with 0.005 to 1.0 silyl substitution.A method for preparation involves:(1) reaction in a caustic medium;(2) recovering a neutralized silated polysaccharide; and(3) washing to remove impurities.
    Type: Grant
    Filed: September 28, 1990
    Date of Patent: December 10, 1991
    Assignee: Aqualon Company
    Inventor: Arjun C. Sau
  • Modified cellulose for biocompatible dialysis membranes II and process for preparation thereof
    Patent number: 4981959
    Abstract: A modified cellulose for biocompatible dialysis membranes having a structure represented by the formula ##STR1## wherein cell is unmodified cellulose or chitin, in each case without hydroxyl groups, s=3 in the case of cellulose and s=2 in the case of chitin, R' is CH.sub.3 and/or C.sub.2 H.sub.5 and/or C.sub.3 H.sub.7, X denotes specified functional groups, m=0.75 to 2.85, and x=0.005 to 2.10. A process for preparation of the cellulose derivatives is also disclosed.
    Type: Grant
    Filed: February 27, 1989
    Date of Patent: January 1, 1991
    Assignee: Akzo N.V.
    Inventor: Michael Diamantoglou