Patents by Inventor Alfred Rengstl

Alfred Rengstl 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).

  • Siloxane copolymers containing vinyloxy groups, their preparation and their use
    Patent number: 5866666
    Abstract: The present invention relates to siloxane copolymers containing vinyloxy groups and a method of preparing the siloxane copolymers. The copolymers of the present invention are useful for the production of coatings which can be crosslinked by light and radiation-curable printing inks.
    Type: Grant
    Filed: January 3, 1997
    Date of Patent: February 2, 1999
    Assignee: Wacker-Chemie GmbH
    Inventors: Christian Herzig, Alfred Rengstl
  • Siloxane copolymers containing vinyloxy groups, their preparation and their use
    Patent number: 5719248
    Abstract: The invention relates to organopolysiloxane copolymers having at least one Si-bonded vinyloxy-functional group and their preparation. The compositions of the present compound crosslink particularly rapidly under light.
    Type: Grant
    Filed: October 21, 1994
    Date of Patent: February 17, 1998
    Assignee: Wacker-Chemie GmbH
    Inventors: Christian Herzig, Alfred Rengstl
  • Siloxane copolymers containing alkenyl groups, their preparation and their use
    Patent number: 5386007
    Abstract: The present invention relates to siloxane copolymers containing alkenyl groups and a process for their preparation. The siloxane copolymers of the present invention can be used in cross-linkable compositions for the production of coatings which repel tacky substances, an example of which would include coatings for release papers or films.
    Type: Grant
    Filed: January 10, 1994
    Date of Patent: January 31, 1995
    Assignee: Wacker-Chemie GmbH
    Inventors: Christian Herzig, Michael Geck, Alfred Rengstl, Friedrich Hockemeyer, Helmut Oswaldbauer
  • Process for reducing the halogen content of halogen-containing polycarbosilanes and polysilanes
    Patent number: 4873297
    Abstract: The invention relates to a process for reducing the halogen content of polysilanes and/or polycarbosilanes having halogen bonded directly to silicon atoms in which the halogen-containing polysilanes and/or polycarbosilanes are contacted with compounds of the general formula ##STR1## where R represents hydrogen or an alkyl radical having 1 or 2 carbon atoms and R' represents hydrogen, an alkali metal or an acetyl radical.
    Type: Grant
    Filed: June 13, 1988
    Date of Patent: October 10, 1989
    Assignee: Wacker-Chemie GmbH
    Inventor: Alfred Rengstl
  • Process for preparing disproportionation products of dichloromethylsilane in the presence of a catalyst
    Patent number: 4870200
    Abstract: The present invention provides a process for preparing disproportionation products of dichloromethylsilane in the presence of a catalyst, which comprises contacting dichloromethylsilane with a catalyst consisting of a carrier which is insoluble in the reaction medium and having NR.sub.3 groups or .sup.- X.sup.+ NR.sub.4 groups covalently bonded thereto, in which R represents the same or different alkyl, aryl, or alicyclic groups which may contain heteroatoms as constituents of the ring, or represents a hydrogen radical, and X.sup.- represents a chloride, bromide or iodide.
    Type: Grant
    Filed: April 1, 1988
    Date of Patent: September 26, 1989
    Assignee: Wacker-Chemie GmbH
    Inventors: Ralph Ottlinger, Alfred Rengstl, Reinhard Jira
  • Process for reducing the halogen content of halogen-containing polycarbosilanes and polysilanes
    Patent number: 4792591
    Abstract: A process for reducing the halogen content of polycarbosilanes and/or polysilanes containing halogen bonded directly to silicon atoms by reacting the polymers with hexamethyldisilazane.
    Type: Grant
    Filed: May 19, 1987
    Date of Patent: December 20, 1988
    Assignee: Wacker-Chemie GmbH
    Inventors: Alfred Rengstl, Andrea Schmidhuber