Patent · US Active

Water-absorbing polymer having a high absorption rate

US9737874B2 · kind B2 · utility

4Cited by

38References

7Claims

0Family size

Assignee

EVONIK DEGUSSA GMBH · DE

Inventors

Laurent Wattebled · Düsseldorf, DE
Christoph Loick · Duisburg, DE
Jorg Harren · Baesweiler, DE
Stefan Leininger · Langenselbold, DE

Key dates

Filing date	Apr 3, 2012
Grant date	Aug 22, 2017
Priority date	—
Expiry date	Sep 5, 2032

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC08J2333/00
WIPO fieldChemical engineering
WIPO sectorChemistry

Abstract

A process for producing a water-absorbing polymer composition, comprising the process steps of (i) mixing (α1) 0.1 to 99.999% by weight of ethylenically unsaturated monomers containing acid groups or salts thereof (α2) 0 to 70% by weight of polymerized, ethylenically unsaturated monomers copolymerizable with (α1), (α3) 0.001 to 10% by weight of one or more crosslinkers, (α4) 0 to 30% by weight of water-soluble polymers, and (α5) 0 to 20% by weight of one or more assistants, where the sum of their weights (α1) to (α5) is 100% by weight, (ii) free-radical polymerization with crosslinking to form a water-insoluble aqueous untreated hydrogel polymer, and surface postcrosslinking the ground hydrogel polymer wherein blowing agents having a particle size of 100 μm to 900 μm are added to the aqueous monomer solution prior to the addition of the initiator and the start of the free-radical polymerization.

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