Patents by Inventor Michael A. Mitchell

Michael A. Mitchell has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Patent number: 11142614
    Abstract: The present invention relates to a process for producing surface-postcrosslinked water-absorbent polymer particles by coating of water-absorbent polymer particles having a content of residual monomers in the range from 0.03 to 15% by weight with at least one surface-postcrosslinker and thermal surface-postcrosslinking at temperatures in the range from 100 to 180° C.
    Type: Grant
    Filed: December 12, 2018
    Date of Patent: October 12, 2021
    Assignee: BASF SE
    Inventors: Thomas Daniel, Norbert Herfert, Stephan Bauer, Katrin Baumann, Birgit Reinhard, Jürgen Freiberg, Christophe Bauduin, Katarzyna Dobrosielska-Oura, Michael A. Mitchell
  • Publication number: 20190135993
    Abstract: The present invention relates to a process for producing surface-postcrosslinked water-absorbent polymer particles by coating of water-absorbent polymer particles having a content of residual monomers in the range from 0.03 to 15% by weight with at least one surface-postcrosslinker and thermal surface-postcrosslinking at temperatures in the range from 100 to 180° C.
    Type: Application
    Filed: December 12, 2018
    Publication date: May 9, 2019
    Applicant: BASF SE
    Inventors: Thomas Daniel, Norbert Herfert, Stephan Bauer, Katrin Baumann, Birgit Reinhard, Jürgen Freiberg, Christophe Bauduin, Katarzyna Dobrosielska-Oura, Michael A. Mitchell
  • Patent number: 10208170
    Abstract: The present invention relates to a process for producing surface-postcrosslinked water-absorbent polymer particles by coating of water-absorbent polymer particles having a content of residual monomers in the range from 0.03 to 15% by weight with at least one surface-postcrosslinker and thermal surface-postcrosslinking at temperatures in the range from 100 to 180° C.
    Type: Grant
    Filed: November 7, 2013
    Date of Patent: February 19, 2019
    Assignee: BASF SE
    Inventors: Thomas Daniel, Norbert Herfert, Stephan Bauer, Katrin Baumann, Birgit Reinhard, Jürgen Freiberg, Christophe Bauduin, Katarzyna Dobrosielska-Oura, Michael A. Mitchell
  • Patent number: 9962459
    Abstract: The present invention relates to ultrathin fluid-absorbent cores comprising a substrate layer, water-absorbent polymer particles and an adhesive, wherein the water-absorbent polymer particles comprise a basic salt of a polyvalent metal cation and a monovalent carboxylic acid anion on the surface and the wet SAP shake out of water-absorbent polymer particles out of the fluid-absorbent core is less than 10% by weight.
    Type: Grant
    Filed: June 29, 2011
    Date of Patent: May 8, 2018
    Assignee: BASF SE
    Inventors: Xiaomin Zhang, Michael A. Mitchell
  • Patent number: 9738769
    Abstract: A process for producing water-absorbing polymer particles with high free swell rate and high permeability by polymerization of an aqueous monomer solution or suspension to give an aqueous polymer gel, wherein a thermal blowing agent essentially free of inorganic acid anions is mixed into the polymer gel, and subsequent thermal drying of the polymer gel.
    Type: Grant
    Filed: February 8, 2013
    Date of Patent: August 22, 2017
    Assignee: BASF SE
    Inventors: Matthias Weismantel, Ulrich Riegel, Thomas Gieger, Markus Braun, Michael A. Mitchell
  • Patent number: 9587081
    Abstract: A process for producing water-absorbing polymer particles with high free swell rate and high permeability by polymerization of an aqueous monomer solution or suspension to give an aqueous polymer gel, wherein a thermal blowing agent essentially free of inorganic acid anions is mixed into the polymer gel, and subsequent thermal drying of the polymer gel.
    Type: Grant
    Filed: September 22, 2015
    Date of Patent: March 7, 2017
    Assignee: BASF SE
    Inventors: Matthias Weismantel, Ulrich Riegel, Thomas Gieger, Markus Braun, Michael A. Mitchell
  • Publication number: 20160009889
    Abstract: A process for producing water-absorbing polymer particles with high free swell rate and high permeability by polymerization of an aqueous monomer solution or suspension to give an aqueous polymer gel, wherein a thermal blowing agent essentially free of inorganic acid anions is mixed into the polymer gel, and subsequent thermal drying of the polymer gel.
    Type: Application
    Filed: September 22, 2015
    Publication date: January 14, 2016
    Applicant: BASF SE
    Inventors: Matthias Weismantel, Ulrich Riegel, Thomas Gieger, Markus Braun, Michael A. Mitchell
  • Publication number: 20150299404
    Abstract: The present invention relates to a process for producing surface-postcrosslinked water-absorbent polymer particles by coating of water-absorbent polymer particles having a content of residual monomers in the range from 0.03 to 15% by weight with at least one surface-postcrosslinker and thermal surface-postcrosslinking at temperatures in the range from 100 to 180° C.
    Type: Application
    Filed: November 7, 2013
    Publication date: October 22, 2015
    Inventors: Thomas Daniel, Norbert Herfert, Stephan Bauer, Katrin Baumann, Birgit Reinhard, Jürgen Freiberg, Christophe Bauduin, Katarzyna Dobrosielska-Oura, Michael A. Mitchell
  • Patent number: 9073040
    Abstract: The present invention relates to a process for producing water-absorbent polymer particles by polymerizing droplets of a monomer solution in a surrounding heated gas phase and flowing the gas cocurrent through the polymerization chamber, wherein the temperature of the gas leaving the polymerization chamber is 130° C. or less, the gas velocity inside the polymerization chamber is at least 0.5 m/s, and the droplets are generated by using a droplet plate having a multitude of bores.
    Type: Grant
    Filed: April 25, 2013
    Date of Patent: July 7, 2015
    Assignee: BASF SE
    Inventors: Rainer Dobrawa, Thomas Daniel, Uwe Stueven, Marco Krüger, Francisco Javier Lopez Villanueva, Norbert Herfert, Karin Flore, Stefan Blei, Michael A. Mitchell
  • Patent number: 8710293
    Abstract: The present invention relates to ultrathin fluid-absorbent cores comprising a substrate layer, multicomponent superabsorbent particles and an adhesive, wherein the wet SAP shake-out of superabsorbent particles out of the fluid-absorbent core is less than 10% by weight.
    Type: Grant
    Filed: September 14, 2011
    Date of Patent: April 29, 2014
    Assignee: BASF SE
    Inventors: Xiaomin Zhang, Michael A. Mitchell
  • Publication number: 20130281594
    Abstract: The present invention relates to a process for producing water-absorbent polymer particles by polymerizing droplets of a monomer solution in a surrounding heated gas phase and flowing the gas cocurrent through the polymerization chamber, wherein the temperature of the gas leaving the polymerization chamber is 130° C. or less, the gas velocity inside the polymerization chamber is at least 0.5 m/s, and the droplets are generated by using a droplet plate having a multitude of bores.
    Type: Application
    Filed: April 25, 2013
    Publication date: October 24, 2013
    Inventors: Rainer Dobrawa, Thomas Daniel, Uwe Stueven, Marco Krüger, Francisco Javier Lopez Villanueva, Norbert Herfert, Michael A. Mitchell
  • Publication number: 20130270479
    Abstract: A process for producing surface postcrosslinked water-absorbing polymer particles, wherein the water-absorbing polymer particles are coated, before, during or after the surface postcrosslinking, with at least one salt of a trivalent metal cation and a glycinate anion.
    Type: Application
    Filed: April 8, 2013
    Publication date: October 17, 2013
    Applicant: BASF SE
    Inventors: Patrick Hamilton, Olaf Hoeller, Joseph Grill, William G-J Chiang, Michael A. Mitchell
  • Patent number: 8481159
    Abstract: The present invention relates to a process for producing water-absorbent polymer particles by polymerizing droplets of a monomer solution in a surrounding heated gas phase and flowing the gas cocurrent through the polymerization chamber, wherein the temperature of the gas leaving the polymerization chamber is 130° C. or less, the gas velocity inside the polymerization chamber is at least 0.5 m/s, and the droplets are generated by using a droplet plate having a multitude of bores.
    Type: Grant
    Filed: August 25, 2010
    Date of Patent: July 9, 2013
    Assignee: BASF SE
    Inventors: Rainer Dobrawa, Thomas Daniel, Uwe Stueven, Marco Krüger, Francisco Javier Lopez Villanueva, Norbert Herfert, Karin Flore, Stefan Blei, Michael A. Mitchell
  • Patent number: 8450428
    Abstract: The present invention relates to a process for producing water-absorbent polymer particles by polymerizing droplets of a monomer solution in a surrounding heated gas phase and flowing the gas cocurrent through the polymerization chamber, which comprises thermal postcrosslinking in the presence of steam.
    Type: Grant
    Filed: March 23, 2011
    Date of Patent: May 28, 2013
    Assignee: BASF SE
    Inventors: Thomas Daniel, Marco Krüger, Karin Flore, Stefan Blei, Uwe Stueven, Norbert Herfert, Michael A. Mitchell
  • Publication number: 20120157302
    Abstract: Particulate superabsorbents having a coating of triclosan are produced by a process that comprises contacting the superabsorbent with an aqueous slurry comprising triclosan, without any subsequent active heating.
    Type: Application
    Filed: August 23, 2010
    Publication date: June 21, 2012
    Applicant: BASF SE
    Inventor: Michael A. Mitchell
  • Publication number: 20120123588
    Abstract: A system is described that uses data connectivity of dispensing units and an online community of users to develop, publicize, distribute, test, customize, and popularize user- and company-created, custom-formulated items. In one example, users can use “Build a Drink” software to create their own drink formulas from a palette of three or more ingredients, preferably dozens. They make custom designs for the labels on the beverage containers. Users/purchasers in the community rate and comment on drinks they try, earn rewards for community participation, and share in the profits from sales of their designer drinks. Custom-formulated items are instantly available at the whole network of dispensing units (or a subset thereof) immediately upon publication of the custom formulation and/or label design. A social network of consumers and designers share and evaluate items, and a recommendation engine suggests purchases based on data available to system.
    Type: Application
    Filed: November 16, 2011
    Publication date: May 17, 2012
    Applicant: ZOODEA, LLC
    Inventors: Michael E. Cloran, Nathan J. Altman, Ankit Gupta, Michael A. Mitchell
  • Publication number: 20120071848
    Abstract: The present invention relates to ultrathin fluid-absorbent cores comprising a substrate layer, multicomponent superabsorbent particles and an adhesive, wherein the wet SAP shake-out of superabsorbent particles out of the fluid-absorbent core is less than 10% by weight.
    Type: Application
    Filed: September 14, 2011
    Publication date: March 22, 2012
    Applicant: BASF SE
    Inventors: Xiaomin Zhang, Michael A. Mitchell
  • Publication number: 20120004632
    Abstract: The present invention relates to ultrathin fluid-absorbent cores comprising a substrate layer, water-absorbent polymer particles and an adhesive, wherein the water-absorbent polymer particles comprise a basic salt of a polyvalent metal cation and a monovalent carboxylic acid anion on the surface and the wet SAP shake out of water-absorbent polymer particles out of the fluid-absorbent core is less than 10% by weight.
    Type: Application
    Filed: June 29, 2011
    Publication date: January 5, 2012
    Applicant: BASF SE
    Inventors: Xiaomin Zhang, Michael A. Mitchell
  • Publication number: 20110237754
    Abstract: The present invention relates to a process for producing water-absorbent polymer particles by polymerizing droplets of a monomer solution in a surrounding heated gas phase and flowing the gas cocurrent through the polymerization chamber, which comprises thermal postcrosslinking in the presence of steam.
    Type: Application
    Filed: March 23, 2011
    Publication date: September 29, 2011
    Applicant: BASF SE
    Inventors: Thomas Daniel, Marco Krüger, Karin Flore, Stefan Blei, Uwe Stueven, Norbert Herfert, Michael A. Mitchell
  • Publication number: 20110059329
    Abstract: The present invention relates to a process for producing water-absorbent polymer particles by polymerizing droplets of a monomer solution in a surrounding heated gas phase and flowing the gas cocurrent through the polymerization chamber, wherein the temperature of the gas leaving the polymerization chamber is 130° C. or less, the gas velocity inside the polymerization chamber is at least 0.5 m/s, and the droplets are generated by using a droplet plate having a multitude of bores.
    Type: Application
    Filed: August 25, 2010
    Publication date: March 10, 2011
    Applicant: BASF SE
    Inventors: Rainer Dobrawa, Thomas Daniel, Uwe Stueven, Marco Krüger, Francisco Javier Lopez Villanueva, Norbert Herfert, Michael A. Mitchell