Patent · US Active

Method for the production of superabsorbers

US11535719B2 · kind B2 · utility

0Cited by

3References

15Claims

0Family size

Assignee

BASF SE

Inventors

Oskar Stephan · Hockenheim, DE
Gerald Gruenewald · Ekeren, BE
Matthias Weismantel · Bad Orb, DE
Karl J. Possemiers · Schilde, BE
Monte Peterson · Pearland, US
Ruediger Funk · Ludwigshafen, DE
Sylvia Bertha · Bischofswerda, DE
Tom Catternan · Geismar, US

Key dates

Filing date	Oct 9, 2018
Grant date	Dec 27, 2022
Priority date	—
Expiry date	Jan 15, 2040

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC08J2429/04
WIPO fieldMacromolecular chemistry, polymers
WIPO sectorChemistry

Abstract

A process for producing superabsorbents, comprising the steps of i) classifying the superabsorbent particles by means of one or more sieves and ii) removing metallic impurities by means of one or more magnetic separators, wherein classification is accomplished using sieves made of a wire mesh, the wires of the wire mesh consist of a steel composed of at least 70% by weight of iron, at least 10% by weight of chromium and less than 2.5% by weight of nickel, and the throughput of superabsorbent particles in the magnetic separator is in the range from 2.0 to 6.5 g/s per cm2 of free cross-sectional area.

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