Patents by Inventor Hans-Joachim Holle

Hans-Joachim Holle 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).

  • Method of producing suspension polymers and improved suspension polymers
    Patent number: 5142008
    Abstract: In the suspension polymerization of (meth)acrylic acid esters or of vinyl aromatics or of mixtures of such monomers, the formation of undesired, very fine "emulsion polymer", which reduces the yield, is reduced if the polymerization is carried out in the presence of polyvalent phosphonic acids or their alkali metal salts or ammonium salts or of alkali metal salts or ammonium salts of condensed inorganic phosphates, e.g. of Graham's salt.
    Type: Grant
    Filed: July 30, 1991
    Date of Patent: August 25, 1992
    Assignee: Degussa AG
    Inventors: Hans-Joachim Holle, Peter Reinhard
  • Process for the production of suspension polymerizates
    Patent number: 4677173
    Abstract: The suspension polymerization of acrylic acid esters, methacrylic acid esters and vinyl aromatics alone or in admixture with subordinate amounts of other monomers is carried out in the presence of an acrylic or methacrylic acid homo or polymerizate or its alkali metal or ammonium salts as dispersing agent with the addition of an acid ester of phosphoric acid with an alkanol having 1 to 8 carbon atoms. The size of polymerizate beads produced is influenced by this procedure.
    Type: Grant
    Filed: January 27, 1986
    Date of Patent: June 30, 1987
    Assignee: Degussa AG
    Inventors: Hans-Joachim Holle, Gerhard Morlock