Isocyanate-modified polymers of aspartic and glutamic acid and method of preparing the same

Abstract

Abstract Polymers whose backbone includes aspartic or glutamic acid units, peptide-linked by their amino and Alpha -carboxyl groups, improve greatly in wet strength when contacted in a liquid medium with organic isocyanates until a sufficient number of the omega -carboxyl groups in the side chains of the polymer is converted to groups of the formula - CO - NH - C * by reaction with NCO groups of the isocyanate. Compounds having two or more NCO groups may cause cross linking. The high permeability of the glutamic or aspartic acid polymers to moisture, oxygen, carbon dioxide, and solutes in aqueous solutions is not significantly impaired, and may be enhanced by conversion of the omega -carboxyl groups, while wet strength is sharply increased, thereby improving utily of the polymers as dialysis membranes and in like applications.

Inventors

• 👤 Akira Akamatsu
• 👤 Akira Okuaki
• 👤 Shigeo Mori

Bibliographic Details