Thomas Leon Majette

US Patent:

6849665, Feb 1, 2005

Filed:

Dec 28, 2001

Appl. No.:

10/028908

Inventors:

Volker Frenz - Mainz-Kostheim, DE
Norbert Herfert - Altenstadt, DE
Ulrich Riegel - Frankfurt, DE
William E. Volz - Suffolk VA, US
Thomas H. Majette - Portsmouth VA, US
James Hill - Virginia Beach VA, US

Assignee:

BASF Aktiengesellschaft - Ludwigshafen

International Classification:

C08J 928

US Classification:

521 64, 424443, 424444, 424448, 428403, 428407, 4283044, 428532, 428533, 428534

Abstract:

Described is a water-absorbent composition containing from 30 to 100% by weight, based on the water-absorbent composition, of water-insoluble water-swellable hydrogels characterized by the following features:.

US Patent:

53507991, Sep 27, 1994

Filed:

May 7, 1991

Appl. No.:

7/694445

Inventors:

Guy T. Woodrum - Chesapeake VA
Thomas H. Majette - Portsmouth VA

Assignee:

Hoechst Celanese Corporation - Somerville NJ

International Classification:

C08F 600
C08B 3100

US Classification:

525 543

Abstract:

This invention is a method for converting fine particles of superabsorbent polymers into larger particles. The invention is primarily directed to aqueous solution processes for preparing superabsorbent polymers. In such aqueous solution polymerization methods, the polymerization reaction product is a high viscosity gel which is dried and ground into particles. In this grinding step, a portion of the product is produced as undesired fine particles having poor absorbency and poor fabrication properties; i. e. they "gel block" and dust. According to the invention, fine superabsorbent polymer particles (up to about 3 parts) are mixed with the high viscosity reaction product gel (100 parts) containing about 20 parts by weight of superabsorbent polymer and water (5 parts per part of recycled particles) to form a mixture with improved rheological properties. The resulting mixture can be processed at a higher rate than a reaction product gel of equal solids content which results in a higher product yield and increased productivity.