Phosphonomethylated chitosans

US5777091A · kind A · utility

Assignee

• Ciba Specialty Chemicals Corporation · US

Inventors

• Martin Kuhn · Neuss, DE
• Thomas Maier · Stockach, DE
• Albert Stehlin · Rixheim, FR

Key dates

• Filing date: Nov 21, 1995
• Grant date: Jul 7, 1998
• Expiry date: Nov 21, 2015

Classification

• Technology area (CPC A): Human Necessities
• CPC primary: A61Q5/00
• WIPO field: Pharmaceuticals
• WIPO sector: Chemistry

Abstract

Phosophonomethylated chitosans containing repeating units of formula ##STR1## wherein R.sub.1 is hydrogen or a radical of formula ##STR2## R.sub.2 is a radical of formula (1a), X.sub.1 and X.sub.2 are each independently of the other hydrogen, C.sub.1 -C.sub.5 alkyl or an alkali metal ion or ammonium ion and n is 50 to 4000, have versatile utilities as sequestrants, stabilizers for bleaching agents as well as humectants in cosmetic compositions.