Water-absorbing polymer particles

US9833766B2 · kind B2 · utility

Assignee

• BASF SE

Inventors

• Markus Braun · Mannheim, DE
• Monica Haag · Ludwigshafen, DE
• Stephan Deuerlein · Ludwigshafen, DE

Key dates

• Filing date: May 7, 2015
• Grant date: Dec 5, 2017
• Expiry date: May 7, 2035

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08J2333/02
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

Crosslinked polymer particles having a) a proportion of particles having a particle size of 150 to 300 μm of at least 20% by weight, b) a free swell rate of the entirety of the polymer particles FSRoverall of at least 0.25 g/g·s, c) a difference ΔFSR of at least 0.15, d) a centrifuge retention capacity CRC of at least 25.0 g/g, and e) a permeability of the swollen gel bed SFC of at least 90×10−7 cm3·s/g are disclosed.