Patent · US Expired

Methods of chelating or bleaching using phosphonomethylated chitosans

US5922851A · kind A · utility

1Cited by

3References

2Claims

0Family size

Assignee

Ciba Specialty Chemicals Corporation · US

Inventors

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

Key dates

Filing date	Mar 24, 1998
Grant date	Jul 13, 1999
Priority date	—
Expiry date	Mar 24, 2018

Classification

Technology area (CPC A)Human Necessities
CPC primaryA61Q5/00
WIPO fieldPharmaceuticals
WIPO sectorChemistry

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.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.