Patents by Inventor Wilfried Knott

Wilfried Knott 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).

  • Publication number: 20250136764
    Abstract: A process prepares hydrosiloxanes using acid-modified aluminium silicate as equilibration catalyst, where pulverulent aluminium silicate is applied, with mixing, to a siloxane mixture that consists of at least two siloxanes and at least one SiH-functional siloxane. The acid-modified aluminium silicate is prepared in situ with addition of acid, and the resulting reaction mixture is allowed to react with further mixing in the sense of an equilibration.
    Type: Application
    Filed: October 29, 2024
    Publication date: May 1, 2025
    Applicant: Evonik Operations GmbH
    Inventors: Wilfried Knott, Matthias Lobert, Christian Havekost
  • Patent number: 12269916
    Abstract: Process for producing PU foams by reacting at least one polyol component with at least one isocyanate component in the presence of one or more catalysts that catalyse the isocyanate-polyol and/or isocyanate-water and/or isocyanate trimerization reactions, and optionally one or more chemical or physical blowing agents, with use of SiOC-linked, linear polydialkylsiloxane-polyoxyalkylene block copolymers having repeat (AB) units, obtainable through the reaction of polyether diols with equilibrated ?,?-diacetoxypolydialkylsiloxanes, wherein a sufficient amount of the SiOC-linked, linear polydialkylsiloxane-polyoxyalkylene block copolymers having repeat (AB) units is added such that the proportion by mass of said component based on the finished PU foam is from 0.0001% to 10% by weight, preferably 0.01% to 6% by weight, especially 0.05% to 5% by weight.
    Type: Grant
    Filed: January 6, 2021
    Date of Patent: April 8, 2025
    Assignee: Evonik Operations GmbH
    Inventors: Isabelle Denise Wessely, Annegret Terheiden, Rüdiger Landers, Roland Hubel, Wilfried Knott, Dagmar Windbiel, Horst Dudzik
  • Publication number: 20250034805
    Abstract: A method for the physical reutilization of siliconized papers includes at least a first step (a), treating at least one siliconized paper by contacting it with at least one alcohol and at least one alkali metal alkoxide with introduction of heat, and without removing from the reaction mixture any water that occurs, and then, a second step (b), removing the at least one desiliconized paper resulting from the first step (a) from the optionally previously neutralized reaction mixture.
    Type: Application
    Filed: July 25, 2024
    Publication date: January 30, 2025
    Applicant: Evonik Operations GmbH
    Inventors: Wilfried Knott, Horst Dudzik
  • Patent number: 12152109
    Abstract: Curable condensation compounds are useful, obtainable by the reaction of end-equilibrated acetoxy group-bearing siloxanes with at least one alkoxy-functional polysiloxane, in the presence of a catalyst.
    Type: Grant
    Filed: December 7, 2021
    Date of Patent: November 26, 2024
    Assignee: Evonik Operations GmbH
    Inventors: Berend-Jan de Gans, Philippe Favresse, Wilfried Knott, Horst Dudzik, Markus Hallack, Florian Düllmann
  • Publication number: 20240294558
    Abstract: The present invention provides a process for depolymerizing waste silicones to afford siloxane cycles, wherein the process comprises a first step of reacting the waste silicone with at least one alcohol and at least one alkali metal alkoxide without removing any potentially occurring water from the reaction mixture, subsequently neutralizing the reaction mixture, removing the solid constituents and then distillatively removing the optionally previously added solvent and excess alcohol and subsequently heating the obtained alkoxysiloxane with at least one fatty alcohol and at least one alkali metal alkoxide with mixing and distillatively removing the siloxane cycles formed.
    Type: Application
    Filed: February 27, 2024
    Publication date: September 5, 2024
    Inventors: Wilfried KNOTT, Horst DUDZIK, Frauke HENNING
  • Patent number: 12060460
    Abstract: Process for producing endcapped, liquid siloxanes having chain lengths of greater than 3 silicon atoms from end-of-life silicones, especially from silicone elastomers and/or silicone rubbers, by acid-catalysed depolymerization thereof in a solvent-free reaction system comprising at least one compound providing end groups MR, at least one compound providing D units, and at least one Brønsted acid.
    Type: Grant
    Filed: April 20, 2022
    Date of Patent: August 13, 2024
    Assignee: Evonik Operations GmbH
    Inventors: Wilfried Knott, Horst Dudzik
  • Patent number: 11905376
    Abstract: The production of SiOC-bonded, linear polydimethylsiloxane-polyoxyalkylene block copolymers comprising repeating (AB) units by reaction of polyether diols with trifluoromethanesulfonic acid-acidified, equilibrated ?,?-diacetoxypolydimethylsiloxanes is described, wherein the reaction is undertaken by adding a solid, liquid or gaseous base, optionally using inert solvents.
    Type: Grant
    Filed: January 13, 2021
    Date of Patent: February 20, 2024
    Assignee: Evonik Operations GmbH
    Inventors: Wilfried Knott, Horst Dudzik, Dagmar Windbiel
  • Publication number: 20240052108
    Abstract: A process for producing one or more alkoxysiloxanes by thermal reaction of at least one siloxane parent structure with at least one alkali metal alkoxide and at least one alcohol, where the process includes mixing, while heating, the at least one siloxane parent structure with the at least includes one alcohol and the at least one alkali metal alkoxide to form a reaction mixture, neutralizing the reaction mixture by addition of at least one Brønsted acid and optionally with addition of at least one solvent, and subsequently isolating the one or more alkoxysiloxanes by thermal separation of volatile compounds. Potentially occurring water is not removed from the reaction mixture and the reaction mixture does not include solvents which form an azeotrope with water and/or further dehydrating agents.
    Type: Application
    Filed: August 10, 2023
    Publication date: February 15, 2024
    Applicant: Evonik Operations GmbH
    Inventors: Wilfried KNOTT, Horst DUDZIK, Frauke HENNING
  • Publication number: 20240052132
    Abstract: A process for producing alkoxysiloxanes by thermal reaction of at least one waste silicone with at least one alkali metal alkoxide and at least one alcohol. The process includes a first step of reacting the at least one waste silicone by mixing with at least one alcohol and at least one alkali metal alkoxide with heating, but without removing any potentially occurring water from the reaction mixture, and a second step of neutralizing the reaction mixture resulting from this reaction using at least one Brønsted acid and separating the solid constituents, and subsequently isolating the alkoxysiloxane by thermal separation of volatile compounds.
    Type: Application
    Filed: August 10, 2023
    Publication date: February 15, 2024
    Applicant: Evonik Operations GmbH
    Inventors: Wilfried KNOTT, Horst DUDZIK, Frauke HENNING
  • Publication number: 20240052107
    Abstract: Processes may produce alkoxysiloxane(s) by reaction of siloxane parent structure(s) with alkali metal alkoxide(s). Such processes may include reacting siloxane parent structure(s) by mixing with alkali metal alkoxide(s) with heating and optionally adding silicon dioxide, but without adding alcohol and without removal of any potentially occurring water from the reaction mixture; and neutralizing the resulting reaction mixture by adding Brønsted acid(s), optionally solvent(s), and preferably separating solid constituents; and subsequently isolating the alkoxysiloxane(s) by thermally separating volatile compounds. The siloxane parent structure(s) may be a hexamethylcyclotrisiloxane (D3), octamethylcyclotetrasiloxane (D4), decamethylcyclopentasiloxane (D5), dodecamethylcyclohexasiloxane (D6), mixture of cyclic branched D/T type siloxanes, silicone oils preferably including at least 100 D units, polydimethylsiloxanediol(s), and/or ?,?-divinylsiloxane(s).
    Type: Application
    Filed: August 10, 2023
    Publication date: February 15, 2024
    Applicant: Evonik Operations GmbH
    Inventors: Wilfried KNOTT, Horst DUDZIK, Frauke HENNING
  • Patent number: 11859053
    Abstract: Process for producing SiOC-bonded, linear polydimethylsiloxane-polyoxyalkylene block copolymers comprising repeating (AB) units, comprising pretreating acidified, end-equilibrated ?,?-diacetoxypolydimethylsiloxanes with a base and reacting the ?,?-diacetoxypolydimethylsiloxanes resulting therefrom with polyether diols in the presence of a solid, liquid or gaseous base, optionally using inert solvents.
    Type: Grant
    Filed: January 11, 2021
    Date of Patent: January 2, 2024
    Assignee: Evonik Operations GmbH
    Inventors: Wilfried Knott, Dagmar Windbiel, Horst Dudzik
  • Patent number: 11795275
    Abstract: The invention describes (i) reaction systems for the production of siloxanes bearing acetoxy functions, comprising a) silanes and/or siloxanes bearing alkoxy groups and/or b) silanes and/or siloxanes bearing acetoxy groups, c) silanes and/or siloxanes bearing hydroxy groups, d) optionally simple siloxane cycles and/or DT cycles, e) a reaction medium, comprising acetic anhydride, perfluoroalkanesulfonic acid and preferably acetic acid, (ii) a process for producing linear or branched siloxanes bearing acetoxy functions and also the use of same for producing polyethersiloxanes.
    Type: Grant
    Filed: November 19, 2019
    Date of Patent: October 24, 2023
    Assignee: Evonik Operations GmbH
    Inventors: Wilfried Knott, Horst Dudzik, Philippe Favresse, Michael Fiedel, André Brötzmann
  • Patent number: 11732092
    Abstract: Upcycling process for producing acidic, end-equilibrated siloxanes bearing acetoxy groups and having chain lengths of greater than 3 silicon atoms from end-of-life silicones by thermal digestion in an acidic reaction medium comprising acetic anhydride, acetic acid and at least one further Brønsted acid having a pKa of <4, the digestion taking place in a reactor having a volume of at least 1 liter.
    Type: Grant
    Filed: September 15, 2021
    Date of Patent: August 22, 2023
    Assignee: Evonik Operations GmbH
    Inventors: Wilfried Knott, Horst Dudzik, Dietmar Schaefer
  • Patent number: 11732091
    Abstract: Described is a process for producing SiOC-bonded polyether siloxanes branched in the siloxane portion from cyclic branched siloxanes of the D/T type, wherein said process comprises in a first step reacting the mixtures of cyclic branched siloxanes of the D/T type with acetic anhydride optionally in admixture with simple siloxane cycles under acid catalysis to afford acetoxy-bearing branched siloxanes, in a second step performing the equilibration of the acetoxy-modified branched siloxane with superacid, preferably with addition of acetic acid and in a third step reacting the superacid-treated acetoxysiloxane with polyetherols optionally in the presence of bases and optionally in the presence of an inert solvent.
    Type: Grant
    Filed: April 17, 2020
    Date of Patent: August 22, 2023
    Assignee: Evonik Operations GmbH
    Inventors: Wilfried Knott, Horst Dudzik
  • Patent number: 11725017
    Abstract: Described is a process for producing SiOC-bonded polyether siloxanes branched in the siloxane portion from cyclic branched siloxanes of the D/T type, wherein said process comprises in a first step reacting the mixtures of cyclic branched siloxanes of the D/T type with acetic anhydride optionally in admixture with simple siloxane cycles under acid catalysis to afford acetoxy-bearing branched siloxanes, in a second step performing the equilibration of the acetoxy-modified branched siloxane with trifluoromethanesulfonic acid, preferably with addition of acetic acid, and in a third step reacting the trifluoromethanesulfonic acid-treated acetoxysiloxane with polyetherols optionally in the presence of bases and optionally in the presence of an inert solvent.
    Type: Grant
    Filed: August 15, 2018
    Date of Patent: August 15, 2023
    Assignee: Evonik Operations GmbH
    Inventors: Wilfried Knott, Horst Dudzik
  • Publication number: 20230159756
    Abstract: Curable condensation compounds are obtainable by a reaction of non-end-equilibrated acetoxy group-bearing siloxanes with at least one alkoxy-functional polysiloxane, in the presence of a catalyst.
    Type: Application
    Filed: November 24, 2022
    Publication date: May 25, 2023
    Applicant: Evonik Operations GmbH
    Inventors: Berend-Jan DE GANS, Wilfried Knott, Horst Dudzik, Markus Hallack, Florian Düllmann, Philippe Favresse
  • Patent number: 11591448
    Abstract: The method for the physical reutilization of sheet-like siliconized structures comprises treating the sheet-like siliconized structure in a liquid digestion system comprising acetic anhydride and/or an acetoxysiloxane, and at least one Brønsted acid, optionally solvent, preferably with addition of acetic acid, and removing the desiliconized sheet-like structure from the liquid phase.
    Type: Grant
    Filed: February 17, 2021
    Date of Patent: February 28, 2023
    Assignee: Evonik Operations GmbH
    Inventors: Wilfried Knott, Horst Dudzik, Dietmar Schaefer
  • Publication number: 20230041322
    Abstract: A process can be used for increasing the molecular weight of low molecular weight ?,?-polysiloxanediols. The process involves heating the low molecular weight ?,?-polysiloxanediols in the presence of acetic anhydride at temperatures of 80° C. to 220° C., preferably at temperatures of 100 to 200° C., and particularly preferably at temperatures of 120-180° C., for 1 h to 24 h, preferably for 2 h to 16 h, and particularly preferably for 3 h to 12 h. The molar amount of the silanol groups used is greater than that of the acetic anhydride used.
    Type: Application
    Filed: July 12, 2022
    Publication date: February 9, 2023
    Applicant: Evonik Operations GmbH
    Inventors: Berend-Jan DE GANS, Philippe Favresse, Wilfried Knott, Horst Dudzik, Monika Johannes
  • Publication number: 20220363838
    Abstract: A process can be used for preparing silicone (meth)acrylates, according to which at least one acetoxysilicone is reacted with at least one hydroxyfunctional (meth)acrylic acid ester. The corresponding silicone (meth)acrylates are useful, and can be used in curable compositions.
    Type: Application
    Filed: September 4, 2020
    Publication date: November 17, 2022
    Applicant: Evonik Operations GmbH
    Inventors: Frauke HENNING, Wilfried Knott, Sadik Amajjahe, Hardi Döhler, Andrea Lohse, Horst Dudzik
  • Patent number: 11498996
    Abstract: SiOC-linked, linear polydimethylsiloxane-polyoxyalkylene block copolymers of formula (I) C—B-(AB)a—C1 are produced by reaction of end-equilibrated ?,?-diacetoxypolydimethylsiloxanes with a mixture including at least one polyether polyol, preferably a polyether diol, and at least one polyether monool or at least one monohydric alcohol.
    Type: Grant
    Filed: May 26, 2020
    Date of Patent: November 15, 2022
    Assignee: Evonik Operations GmbH
    Inventors: Wilfried Knott, Horst Dudzik, Frauke Henning, Philippe Favresse