Complete drying method for hydrogels

US6641064B1 · kind B1 · utility

Assignee

• BASF SE

Inventors

• Joachim Dentler · Bruchköbel, DE
• Norbert Herfert · Charlotte, US
• Helmut Klotzsche · Alzenau, DE
• Rudolf Schliwa · Alzenau, DE
• Uwe Stuven · Bad Soden, DE

Key dates

• Filing date: Apr 25, 2001
• Grant date: Nov 4, 2003
• Expiry date: Apr 25, 2021

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08J2300/14
• WIPO field: Chemical engineering
• WIPO sector: Chemistry

Abstract

Hydrogel particles are produced by a drying step followed sequentially by precomminuting, grinding, separating, and further drying of coarse particles.