Patents by Inventor Walter Mächtle

Walter Mächtle 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 for producing polymer coated pigment particles by precipitation
    Patent number: 6924035
    Abstract: Described is a process for preparing polymer-enrobed pigment particles, which comprises mixing in the presence of finely dispersed pigment particles a solution of a polymer in a first solvent with a second solvent in which the polymer is substantially insoluble. The pigment particle can be specifically modified by judicious selection of the polymer.
    Type: Grant
    Filed: September 25, 2001
    Date of Patent: August 2, 2005
    Assignee: BASF Aktiengesellschaft
    Inventors: Helmut Auweter, Heribert Bohn, Walter Mächtle, Manfred Mielke, Rüdiger Sens, Karl Siemensmeyer
  • Method for producing aqueous polymer dispersions containing colorants
    Patent number: 6727318
    Abstract: The present invention relates to a process for preparing dye-comprising aqueous polymer dispersions by free-radical aqueous emulsion polymerization of ethylenically unsaturated monomers in the presence of free-radical initiators, in which at least some of the monomers are employed in the form of an oil-in-water emulsion E1 whose disperse phase comprises at least one oil-soluble dye, wherein the disperse phase of E1 is formed essentially of dye-comprising monomer droplets having a diameter <500 nm. The present invention also relates to perylene dyes of the formula III as set forth in claim 35. The present invention relates in addition to dye-comprising formulations which comprise the dye-comprising polymers of the invention and to pigmented formulations which comprise a polymer of the invention comprising optical brightener.
    Type: Grant
    Filed: August 9, 2000
    Date of Patent: April 27, 2004
    Assignee: BASF Aktiengesellschaft
    Inventors: Klemens Mathauer, Arno Böhm, Walter Mächtle, Peter Rossmanith, Sabine Kielhorn-Bayer, Klaus Müllen, Ulrike Rohr, Friedrich-Wilhelm Raulfs, Ulrike Schlösser, Wolfgang Schrof, Harutyun Hanciogullari, Karl Siemensmeyer, Paul Delavier, Rüdiger Sens, Torsten Freund, Takahiro Ikeda, Takanori Wakebe
  • Surface active random radical (co)polymer and dispersion method for using the same
    Patent number: 6624219
    Abstract: The present invention relates to a set of (co)polymers, dispersion formulations, solid solutions and formulation conditions able to disperse a dye selected from the group of a monoazo dye, quinophthalone dye and an anthraquinone dye in a stable nanoparticular form in an aqueous medium.
    Type: Grant
    Filed: August 17, 2000
    Date of Patent: September 23, 2003
    Assignees: BASF Aktiengesellschaft, SYMYX Technologies, Inc.
    Inventors: Robert Heger, Wolfgang Schrof, Michael Seufert, Helmut Auweter, Walter Mächtle, Rüdiger Iden, Dieter Horn, Ralph Nielsen, Eric Carlson, Chang Han-Ting, Sigrid Kuebler, Petro Miroslav
  • Centrifuging process for sample characterization
    Patent number: 6278518
    Abstract: A process for characterizing at least one sample comprising at least one substance (Si), in which at least one substance (Si) in the sample is identified and in which at least one quantity (Gji) which characterizes a substance (Si) in the sample is determined, at least the following process steps being carried out successively or simultaneously in an analytical centrifuging device: a) centrifuging the sample in an analytical centrifuge, b) exposing the sample to monochromatic light, preferably laser light, c) detecting light scattered by the sample, d) identifying at least one substance (Si) by a spectral evaluation of the inelastically scattered fraction of the scattered light which was detected in step c), e.g. by means of Raman scattering, and e) determining at least one quantity (Gji) for a substance (Si) by evaluating the state of the sample which it has entered as a consequence of the centrifuging in step a).
    Type: Grant
    Filed: July 6, 1998
    Date of Patent: August 21, 2001
    Assignee: BASF Aktiengesellschaft
    Inventors: Wolfgang Schrof, Peter Rossmanith, Walter Mächtle
  • Preparation of an aqueous polymer dispersion by the free radical aqueous emulsion polymerization method
    Patent number: 6218468
    Abstract: In a process for the preparation of an aqueous polymer dispersion by the free radical aqueous emulsion polymerization method, the polymerization is carried out in the presence of frozen micelles of amphiphilic substances.
    Type: Grant
    Filed: July 22, 1998
    Date of Patent: April 17, 2001
    Assignees: BASF Aktiengesellschaft, Max-Planck-Institut
    Inventors: Klemens Mathauer, Walter Mächtle, Wolfgang Schrof, Horst Schuch, Timo Rager, Wolfgang Meyer, Gerhard Wegner