Method for producing superabsorbers with a low residual monomer content

US8410233B2 · kind B2 · utility

Assignee

• BASF SE

Inventors

• Mark Elliott · Ludwigshafen, DE
• Thomas Daniel · Waldsee, DE

Key dates

• Filing date: Aug 10, 2009
• Grant date: Apr 2, 2013
• Expiry date: Aug 10, 2029

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08L101/14
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

To prepare superabsorbents with a low residual monomer content, a salt of urea with an inorganic acid is added to the monomer mixture before or during the polymerization or to the polymer after the polymerization but before a heat treatment which follows the polymerization.