Patents by Inventor Andrea Wittkowski

Andrea Wittkowski 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).

  • Concrete flow improvers and water reducers
    Patent number: 11447579
    Abstract: The present invention relates to a process for preparing a poly(meth)acrylic acid, characterized in that a (meth)acrylic acid-containing process stream from (meth)acrolein synthesis is subjected to free-radical polymerization. The invention also relates to the esterification of the polymer obtained to give a homopolymer or copolymer ester, and to the use thereof as additive, flow improver and water reducer.
    Type: Grant
    Filed: August 1, 2018
    Date of Patent: September 20, 2022
    Assignee: Roehm GmbH
    Inventors: Steffen Krill, Johannes Vorholz, Andreas Weber, Marita Kaufmann, Andrea Wittkowski
  • GLYCEROL (METH)ACRYLATE CARBOXYLIC ESTER HAVING A LONG SHELF LIFE
    Publication number: 20220281801
    Abstract: The present invention describes storage-stable glycerol (meth)acrylate carboxylic esters and a method for preparing these esters.
    Type: Application
    Filed: May 22, 2022
    Publication date: September 8, 2022
    Applicant: Evonik Röhm GmbH
    Inventors: Patrik Hartmann, Marita Kaufmann, Steffen Krill, Thorben Schütz, Marcel Treskow, Andrea Wittkowski
  • Glycerol (meth)acrylate carboxylic ester having a long shelf life
    Patent number: 11414373
    Abstract: The present invention describes storage-stable glycerol (meth)acrylate carboxylic esters and a method for preparing these esters.
    Type: Grant
    Filed: November 14, 2017
    Date of Patent: August 16, 2022
    Assignee: Evonik Operations GmbH
    Inventors: Patrik Hartmann, Marita Kaufmann, Steffen Krill, Thorben Schütz, Marcel Treskow, Andrea Wittkowski
  • CONCRETE FLOW IMPROVERS AND WATER REDUCERS
    Publication number: 20210115166
    Abstract: The present invention relates to a process for preparing a poly(meth)acrylic acid, characterized in that a (meth)acrylic acid-containing process stream from (meth)acrolein synthesis is subjected to free-radical polymerization. The invention also relates to the esterification of the polymer obtained to give a homopolymer or copolymer ester, and to the use thereof as additive, flow improver and water reducer.
    Type: Application
    Filed: August 1, 2018
    Publication date: April 22, 2021
    Applicant: Roehm GmbH
    Inventors: Steffen KRILL, Johannes VORHOLZ, Andreas WEBER, Marita KAUFMANN, Andrea WITTKOWSKI
  • GLYCEROL (METH)ACRYLATE CARBOXYLIC ESTER HAVING A LONG SHELF LIFE
    Publication number: 20190352251
    Abstract: The present invention describes storage-stable glycerol (meth)acrylate carboxylic esters and a method for preparing these esters.
    Type: Application
    Filed: November 14, 2017
    Publication date: November 21, 2019
    Applicant: Evonik Röhm GmbH
    Inventors: Patrik HARTMANN, Marita KAUFMANN, Steffen KRILL, Thorben SCHÜTZ, Marcel TRESKOW, Andrea WITTKOWSKI
  • Process for manufacturing unsaturated carboxylic acid anhydrides
    Patent number: 6936734
    Abstract: The present invention relates to a process for preparing an unsaturated carboxylic acid anhydride by reacting an unsaturated carboxylic acid and a lower aliphatic carboxylic acid anhydride in the presence of a stabilizer and catalyst that contains a metal salt of an anionic organic compound which has at least one carboxyl group.
    Type: Grant
    Filed: February 11, 2002
    Date of Patent: August 30, 2005
    Assignee: Roehm GmbH & Co., KG
    Inventors: Bardo Schmitt, Joachim Knebel, Wolfgang Klesse, Andrea Wittkowski, Benedikt Laux
  • Process for synthesis of Di(meth)acrylic acid esters
    Patent number: 6639099
    Abstract: A process for the synthesis and recovery of di(meth)acrylic acid esters at a high degree of purity. Di(meth)acrylic acid esters are produced by transesterfication of (meth)acrylic acid esters of C1 to C4 alcohols with 1,n-diols (where n≧3) in the presence of a zirconium catalyst that comprises a chelate of zirconium with a 1,3-dicarbonyl compound. These catalysts can be readily separated or removed from the reaction mixture by precipitation with phosphoric acid, thus providing a convenient and inexpensive method of producing a di(meth)acrylic acid ester with a reduced level of zirconium.
    Type: Grant
    Filed: August 24, 2000
    Date of Patent: October 28, 2003
    Assignee: Roehm GmbH & Co. KG
    Inventors: Joachim Knebel, Joachim Carl, Guenter Graeff, Andrea Wittkowski
  • Process for manufacturing unsaturated carboxylic acid anhydrides
    Publication number: 20020161260
    Abstract: A process for preparing an unsaturated carboxylic acid anhydride, which includes: reacting an unsaturated carboxylic acid and a lower aliphatic carboxylic acid anhydride in the presence of: a catalyst; and a stabilizer.
    Type: Application
    Filed: February 11, 2002
    Publication date: October 31, 2002
    Applicant: ROEHM GMBH & CO. KG
    Inventors: Bardo Schmitt, Joachim Knebel, Wolfgang Klesse, Andrea Wittkowski, Benedikt Laux