Michael M Azad

7396584, Jul 8, 2008

Nov 15, 2002

10/495149

Michael M. Azad - Charlotte NC, US
Norbert Herfert - Charlotte NC, US
Michael Mitchell - Waxhaw NC, US
Jim Robinson - Chesapeake VA, US

BASF Aktiengesellschaft - Ludwigshafen

B32B 27/14
B32B 5/16

428327, 4282974, 428372, 428407

The invention concerns superabsorbent particles with a shell, wherein said shell comprises a cationic polymer crosslinked by the addition of crosslinker and adhered to hydrogel-forming polymer obtainable by applying a coating solution, containing both a cationic polymer and crosslinker, to hydrogel-forming polymer having a residual water content of less than 10 w %, their production and use.

7504551, Mar 17, 2009

Mar 19, 2004

10/547353

Norbert Herfert - Charlotte NC, US
Michael M. Azad - Charlotte NC, US
Peter W. Carrico - West Point MS, US
Guy Thomas Woodrum - Suffolk VA, US
Michael A. Mitchell - Waxhaw NC, US

BASF Aktiengesellschaft - Ludwigshafen

A61F 13/49
C08F 2/48
C08F 4/40

604372, 604358, 526220, 526222, 526915, 524815, 524827, 524831, 524832, 522 42, 522 84, 522152, 522153, 522154, 428402

A color-stable superabsorbent polymer having long-term color stability, and methods of manufacturing the polymer, are disclosed. The superabsorbent polymer is prepared using a sulfinic acid derivative, like 2-hydroxy-2-sulfinatoacetic acid, a salt thereof, or a mixture thereof, as the reducing agent in a polymerization initiator system for the preparation of a superabsorbent polymer from monomers. The resulting superabsorbent polymer resists color degradation during periods of extended storage, even at an elevated temperature and humidity.

7528291, May 5, 2009

Mar 19, 2004

10/547452

Norbert Herfert - Charlotte NC, US
Michael M. Azad - Charlotte NC, US
Peter W. Carrico - West Point MS, US

BASF Aktiengesellschaft - Ludwigshafen

A61F 13/49
C08J 3/28
C08F 2/16

604372, 522 42, 522 84, 522 86, 522152, 522153, 522154, 524815, 524827, 524831, 524832, 428402

A color-stable superabsorbent polymer having long-term color stability, and methods of manufacturing the polymer, are disclosed. The color-stable superabsorbent polymer is prepared in the essential absence of a persulfate, and is subjected to a low dose of ultraviolet radiation. The resulting superabsorbent polymer resists color degradation during periods of extended storage, even at an elevated temperature and humidity.

7795345, Sep 14, 2010

Nov 22, 2006

11/562760

Scott J. Smith - Düsseldorf, DE
Mark C. Joy - Reidsville NC, US
Whei-Neen Hsu - Greensboro NC, US
Markus Frank - Kuppenheim, DE
Michael M. Azad - Reidsville NC, US

Evonik Stockhausen, LLC - Greensboro NC

C08F 220/06

524556, 524430, 524431, 524442, 5263171, 526240, 5263182

The invention relates to absorptive, crosslinked polymers which are based on partly neutralized, monoethylenically unsaturated monomers carrying acid groups, and have improved properties, in particular in respect of their capacity for transportation of liquids in the swollen state, and which has a high gel bed permeability and high centrifuge retention capacity.

8222477, Jul 17, 2012

Oct 20, 2008

12/254434

Michael M. Azad - Reidsville NC, US
Scott J. Smith - Greensboro NC, US
Mark Joy - Reidsville NC, US
Geoffrey Wyatt Blake - Kernersville NC, US
Michael S. Jarman - High Point NC, US

Evonik Stockhausen, LLC - Greensboro NC

A61F 13/15

604372, 604367, 604358

A process for the preparation of superabsorbent polymer containing clay, the process including the steps of (I) polymerizing a polymerization mixture comprising: (a) one or more ethylenically unsaturated carboxyl-containing monomers, (b) one or more crosslinking agents, (c) optionally one or more comonomers copolymerizable with the carboxyl-containing monomer, (d) neutralizing agent to partially neutralize the polymer to from about 50% to about 99%, by weight, and (e) a polymerization medium, to form a crosslinked partially neutralized hydrogel, (II) admixing a clay with the crosslinked partially neutralized hydrogel to form partially neutralized superabsorbent polymer-clay hydrogel; (III) drying the crosslinked partially neutralized hydrogel at a temperature from about 190 C. to about 210 C. and for a time period of from about 15 minutes to about 120 minutes, and (IV) comminuting the dried partially neutralized superabsorbent polymer-clay hydrogel to particles.

8466228, Jun 18, 2013

Aug 6, 2010

12/851664

Scott J. Smith - Düsseldorf, DE
Mark C. Joy - Reidsville NC, US
Whei-Neen Hsu - Greensboro NC, US
Markus Frank - Kuppenheim, DE
Michael M. Azad - Reidsville NC, US

Evonik Corporation - Parsippany NJ

C08F 220/06

524556, 524430, 524431, 524442, 5263171, 526240, 5263182

The invention relates to absorptive, crosslinked polymers which are based on partly neutralized, monoethylenically unsaturated monomers carrying acid groups, and have improved properties, in particular in respect of their capacity for transportation of liquids in the swollen state, and which has a high gel bed permeability and high centrifuge retention capacity.

20050239942, Oct 27, 2005

Jul 24, 2003

10/522937

Norbert Herfert - Charlotte NC, US
Michael Azad - Charlotte NC, US
Michael Mitchell - Waxhaw NC, US
Guy Woodrum - Suffolk VA, US
William Chiang - Yorktown VA, US
Patricia Brown - Charlotte NC, US
James Robinson - Chesapeake VA, US

Basf Aktiengesellschaft - Ludwigshafen

C08L001/00
C08J003/00
C08K003/34

524445000

Superabsorbent polymer (SAP) particels containing a clay are disclosed. The clay is added to an SAP hydrogel prior to SAP neutralization to provide particles having improved fluid acquisition rates and an improved permeability of a fluid through the swollen SAP-clay particles. Diaper cores and absorbent articles containing the SAP-clay particles also are disclosed.

20050245393, Nov 3, 2005

Jul 24, 2003

10/523086

Norbert Herfert - Charlotte, DE
Michael Azad - Charlotte NC, US
Michael Mitchell - Waxhaw NC, US
Guy Woodrum - Suffolk NC, US
William Chiang - Yorktown VA, US

B01J020/26

502402000

Surface-crosslinked superabsorbent polymer (SAP) particles having a clay in the vicinity of the surfaces of the SAP particles a clay are disclosed. The clay is added to SAP particles during surface crosslinking to substantially reduce the generation, and recycling, of SAP fines, and to provide SAP particles having an improved acquisition rate of fluids and an improved permeability of a fluid through the swollen SAP particles. Diaper cores and absorbent articles containing the surface crosslinked SAP particles also are disclosed.