Patent · US Active

Process for producing an absorbent polymer by means of spread-drying

US7728045B2 · kind B2 · utility

2Cited by

15References

7Claims

0Family size

Assignee

Evonik Stockhausen GmbH · US

Inventors

Volker Becker · Marxzell, DE
Heinz-Peter Grupe · Krefeld, DE
Detlef Jung
Armin Reimann · Willich, DE

Key dates

Filing date	Apr 20, 2005
Grant date	Jun 1, 2010
Priority date	—
Expiry date	Sep 14, 2026

Classification

Technology area (CPC B)Performing Operations; Transporting
CPC primaryB29B9/06
WIPO fieldOther special machines
WIPO sectorMechanical engineering

Abstract

The process according to the invention for production of an absorbent polymer comprising the following process steps: i) polymerization of an aqueous monomer solution to obtain a polymer gel; ii) comminution of the polymer gel to obtain a gel granulate; and iii) drying of the gel granulate, and is characterized in that the gel granulate after step ii) has a spread behavior. The production process of an absorbent polymer distinguishes itself by a particularly efficient drying step iii), which enables a particularly gentle and uniform drying of the gel granulate. The obtained absorbent polymers and products and items produced therefrom have a particularly uniform product quality and constant physical-chemical properties.

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