Patents by Inventor Stefan Kaeshammer

Stefan Kaeshammer 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: 9249094
    Abstract: A process for preparing an N-vinyl compound by vinylating a compound having at least one nitrogen atom (referred to hereinafter as compound for short) with acetylene, wherein before the vinylation, the compound is reacted with an alkali metal hydroxide in a reaction zone and the mean residence time of the alkali metal hydroxide and of the compound in the reaction zone is less than 6 minutes.
    Type: Grant
    Filed: December 8, 2008
    Date of Patent: February 2, 2016
    Assignee: BASF SE
    Inventors: Regina Vogelsang, Stefan Kaeshammer, Wolfgang Staffel, Ulrich Eiden, Alexandra Brand, Lembit Tuttelberg
  • Publication number: 20110034706
    Abstract: A process for preparing N-vinylpyrrolidone by reacting 2-pyrrolidone with acetylene, wherein the 2-pyrrolidone used as a starting material (referred to hereinafter as starting 2-pyrrolidone) comprises less than 1 part by weight of ?-butyrolactone per 100 parts by weight of 2-pyrrolidone.
    Type: Application
    Filed: November 26, 2008
    Publication date: February 10, 2011
    Applicant: BASF SE
    Inventors: Wolfgang Staffel, Stefan Kaeshammer, Roland Kessinger, Regina Vogelsang, Axel Paul, Lembit Tuttelberg
  • Publication number: 20100249434
    Abstract: A process for preparing an N-vinyl compound by vinylating a compound having at least one nitrogen atom (referred to hereinafter as compound for short) with acetylene, wherein before the vinylation, the compound is reacted with an alkali metal hydroxide in a reaction zone and the mean residence time of the alkali metal hydroxide and of the compound in the reaction zone is less than 6 minutes.
    Type: Application
    Filed: December 8, 2008
    Publication date: September 30, 2010
    Applicant: BASE SE
    Inventors: Regina Vogelsang, Stefan Kaeshammer, Wolfgang Staffel, Ulrich Eiden, Alexandra Brand, Lembit Tuttelberg
  • Patent number: 7456249
    Abstract: The present invention relates to a solid, acid catalyst for the preparation of polytetrahydrofuran, polytetrahydrofuran copolymers, diesters or monoesters of these polymers by polymerization of tetrahydrofuran in the presence of at least one telogen and/or comonomer, which has a BET surface area of at least 160 m2/g and an acid center density of at least 0.05 mmol/g for pKa values of from 1 to 6, to a process for preparing it and to a process for the polymerization of cyclic ethers over this catalyst.
    Type: Grant
    Filed: January 10, 2008
    Date of Patent: November 25, 2008
    Assignee: BASF SE
    Inventors: Stephan Schlitter, Martin Haubner, Michael Hesse, Stefan Kaeshammer, Rolf Pinkos, Christoph Sigwart
  • Patent number: 6184420
    Abstract: Unsaturated ketones of the formulae Ia and Ib are prepared by a process consisting of the combination of the following reactions: a) The conventional reaction of an allyl alcohol of the formula IIa or a propargyl alcohol of the formula IIb with an isopropenyl ether of the formula III with formation of a ketal of the formula IV as a byproduct, b) preparation of the isopropenyl ether of the formula III by reacting a ketal of the formula IV with propyne or allene, or a mixture thereof in the gas phase at elevated temperatures in the presence of a heterogeneous catalyst containing zinc or cadmium together with silicon or oxygen, and c) feeding the ketal of the formula IV formed in the reaction (a) into stage (b) for the preparation of the isopropenyl ether of the formula III again.
    Type: Grant
    Filed: September 10, 1998
    Date of Patent: February 6, 2001
    Assignee: BASF Aktiengesellschaft
    Inventors: Joaquim Henrique Teles, Norbert Rieber, Klaus Breuer, Dirk Demuth, Hartmut Hibst, Stefan Kaeshammer, Heinz Etzrodt, Wulf Kaiser