Patents by Inventor Mirko Michel

Mirko Michel 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).

  • Process for preparing polymers from monomers comprising laurolactam
    Publication number: 20190177478
    Abstract: Polymers can be prepared from monomers comprising laurolactam, by a process including a. Beckmann rearrangement of cyclododecanone oxime to give laurolactam in the presence of a Beckmann rearrangement catalyst, b. removal of impurities from the laurolactam to obtain purified laurolactam, and c. polymerization of monomers comprising purified laurolactam. For avoidance of discolouration or yellowing under ageing conditions, prior to the polymerization, polycyclic substances containing 24 carbon atoms and at least one heteroatom selected from oxygen and nitrogen and having a molar mass between 300 and 380 g/mol are limited to 500 ppm, based on laurolactam.
    Type: Application
    Filed: December 11, 2018
    Publication date: June 13, 2019
    Applicant: Evonik Degussa GmbH
    Inventors: Kévin MICOINE, Kristina ZUMBANSEN, Franz-Erich BAUMANN, Marcus Matthias STERGAR, Andreas PAWLIK, Christoph HILLER, Mirko MICHEL, Christoph KOOPMANN
  • Process for preparation of highly pure, non-yellowing methacrylic acid
    Patent number: 9290431
    Abstract: This invention relates to a process of preparing highly pure, non-yellowing (meth)acrylic acid necessary for high-tech applications requiring long-tem color stability in the presence of amines. Process for the preparation of highly pure, non-yellowing (meth)acrylic acid comprising the steps: f) Condensation of a (meth)acrylic acid-containing gas phase obtained via a gas phase oxidation process of a C4-compound to generate an aqueous (meth)acrylic acid solution g) Separation of the (meth)acrylic acid from the aqueous (meth)acrylic acid solution to obtain crude (meth)acrylic acid h) Rectification of the crude (meth)acrylic acid to obtain pure (meth)acrylic acid via a sidestream outlet of the rectification column i) Treatment of the pure (meth)acrylic acid generated in step c) with an ion exchange resin j) Distillation of the (meth)acrylic acid generated in step d).
    Type: Grant
    Filed: April 22, 2013
    Date of Patent: March 22, 2016
    Assignee: EVONIK RÖHM GmbH
    Inventors: Zhengfeng Zhang, Gerhard Koelbl, Lorenza Sartorelli, Horst Hiltner, Huisheng Wang, Mirko Michel
  • PROCESS FOR PREPARATION OF HIGHLY PURE, NON-YELLOWING METHACRYLIC ACID
    Publication number: 20150126777
    Abstract: This invention relates to a process of preparing highly pure, non-yellowing (meth)acrylic acid necessary for high-tech applications requiring long-tem color stability in the presence of amines. Process for the preparation of highly pure, non-yellowing (meth)acrylic acid comprising the steps: f) Condensation of a (meth)acrylic acid-containing gas phase obtained via a gas phase oxidation process of a C4-compound to generate an aqueous (meth)acrylic acid solution g) Separation of the (meth)acrylic acid from the aqueous (meth)acrylic acid solution to obtain crude (meth)acrylic acid h) Rectification of the crude (meth)acrylic acid to obtain pure (meth)acrylic acid via a sidestream outlet of the rectification column i) Treatment of the pure (meth)acrylic acid generated in step c) with an ion exchange resin j) Distillation of the (meth)acrylic acid generated in step d).
    Type: Application
    Filed: April 22, 2013
    Publication date: May 7, 2015
    Applicant: EVONIK INDUSTRIES AG
    Inventors: Zhengfeng Zhang, Gerhard Koelbl, Lorenza Sartorelli, Horst Hiltner, Huisheng Wang, Mirko Michel