Superabsorbent polymers from cross-linked polyacrylonitrile emulsions

US5635569A · kind A · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

• Gunter Sackmann · Leverkusen, DE
• Siegfried Korte · Odenthal, DE
• Sergej Schapowalow · Neunburg vorm Wald, DE
• Klaus Szablikowski · Walsrode, DE
• Wolfgang Koch · Batavia, US

Key dates

• Filing date: Aug 9, 1995
• Grant date: Jun 3, 1997
• Expiry date: Aug 9, 2015

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y02A30/14
• WIPO field: Medical technology
• WIPO sector: Instruments

Abstract

Superabsorbent polymers based on partly hydrolysed homopolymers and/or copolymers of acrylonitrile which are cross-linked through the incorporation of polyfunctional monomers, wherein 30 to 80 mol-% of the nitrile groups are converted into carboxylate groups, 20 to 70 mol-% of the nitrile groups are converted into carbonamide groups and 0 mol-% to 20 mol-% of the nitrile groups are unchanged, and the said cross-linked polymers possess a swelling capacity of 700 g/g in water and of up to 60 g/g in physiological saline and a gel strength of from 20 g to 100 g, their preparation and their use.