Method for measuring the permeability of superabsorbers

US12196660B2 · kind B2 · utility

Assignee

• BASF SE

Inventors

• Markus Toennessen · Ludwigshafen, DE
• Marc Haefner · Ludwigshafen, DE
• Karsten Kraemer · Ludwigshafen, DE
• Christophe Bauduin · Ludwigshafen, DE
• Thomas Daniel · Waldsee, DE

Key dates

• Filing date: Feb 18, 2019
• Grant date: Jan 14, 2025
• Expiry date: May 2, 2042

Classification

• Technology area (CPC G): Physics
• CPC primary: G01N2015/0846
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

A method of measuring indices in superabsorbents, by initially charging excess aqueous solution or dispersion, swelling the superabsorbent in the initially charged aqueous solution or dispersion while stirring, dissolving or dispersing a component A in the aqueous solution or dispersion, measuring the enrichment of component A in the aqueous solution or dispersion during the swelling of the superabsorbent, using the enrichment of component A in the aqueous solution or dispersion to measure the time-dependent swelling characteristics and using these to determine the swelling constant k or the characteristic swell time τ, the index being dependent on the permeability of the superabsorbent, and ascertaining the index by means of a correlation measured beforehand between swelling constant k and index or characteristic swell time τ and index.