Method of producing swellable, non-aging starch maleates, biologically degradable starch maleates as well as use

US6063914A · kind A · utility

Assignee

• Stockhausen GmbH & Co. KG · DE

Inventors

• Heiko Wolf · Thalwil, CH
• Klaus Dorn · Kettwig, DE
• Thomas Eurich · Frankfurt, DE

Key dates

• Filing date: Jan 26, 1998
• Grant date: May 16, 2000
• Expiry date: Jan 26, 2018

Classification

• Technology area (CPC A): Human Necessities
• CPC primary: A61L15/60
• WIPO field: Medical technology
• WIPO sector: Instruments

Abstract

The aging of swellable starch maleates is reduced by reacting with one or more singly and/or multiply functional nucleophiles as in a Michael condensation reaction. Mixtures of mercaptoethanol and 1,2-bis-(2-mercaptoethoxy)-ethane or mixtures of sodium bisulfite and pentaerythrite-tetrakis-(2-mercaptoacetate) are preferred. The decrease of the retention capacity [SRV] in the reaction products after 100 days is preferably <10%. The products find use as biodegradable, non-aging superabsorbers.