Postcrosslinking of water-absorbing polymers

US7981969B2 · kind B2 · utility

Assignee

• BASF SE

Inventors

• Ulrich Riegel · Landstuhl, DE
• Thomas Daniel · Waldsee, DE
• Matthias Weismantel · Bad Orb, DE
• Mark Elliott · Ludwigshafen, DE
• Dieter Hermeling · Haßloch, DE

Key dates

• Filing date: Feb 18, 2005
• Grant date: Jul 19, 2011
• Expiry date: Feb 19, 2028

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08J2300/14
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

The invention concerns a process for producing water-absorbing polymer, which comprises a base polymer A being mixed with a first aqueous solution B of at least one surface postcrosslinker and a second aqueous solution C of at least one polyvalent cation and thermally treated, wherein said base polymer A is based on at least 50% neutralized acid-functional monomer and said solutions B and C are metered wholly or partly concurrently through separate nozzles whereby a water-absorbing polymer having a high saline flow conductivity value is obtained.