Patents by Inventor Guenter Hirsch

Guenter Hirsch 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: 6080813
    Abstract: Aqueous polymer dispersions containing polymers obtainable by free-radical polymerization of unsaturated monomers, and sugared starch, and the use thereof.
    Type: Grant
    Filed: February 21, 1996
    Date of Patent: June 27, 2000
    Assignee: BASF Aktiengesellschaft
    Inventors: Kurt Wendel, Thomas Schwerzel, Guenter Hirsch
  • Patent number: 5705563
    Abstract: Aqueous polymer dispersions containing polymers obtainable by free-radical polymerization of unsaturated monomers, and sugared starch, and the use thereof.
    Type: Grant
    Filed: August 13, 1996
    Date of Patent: January 6, 1998
    Assignee: BASF Aktiengesellschaft
    Inventors: Kurt Wendel, Thomas Schwerzel, Guenter Hirsch
  • Patent number: 5536779
    Abstract: A polymer powder obtained by drying an aqueous polymer dispersion, wherein the aqueous polymer dispersion is obtained by free-radical polymerization of unsaturated monomers and contains at least one added starch-degradation product which is obtained by hydrolysis in the aqueous phase, is water soluble at room temperature and has a weight average molecular weight M.sub.w of from 2500 to 25000.
    Type: Grant
    Filed: August 8, 1994
    Date of Patent: July 16, 1996
    Assignee: BASF Aktiengesellschaft
    Inventors: Kurt Wendel, Thomas Schwerzel, Guenter Hirsch
  • Patent number: 5358998
    Abstract: Aqueous polymer dispersions containing polymers obtainable by free-radical polymerization of unsaturated monomers, and sugared starch, and the use thereof.
    Type: Grant
    Filed: October 7, 1992
    Date of Patent: October 25, 1994
    Assignee: BASF Aktiengesellschaft
    Inventors: Kurt Wendel, Thomas Schwerzel, Guenter Hirsch
  • Patent number: 4801354
    Abstract: Aqueous pigment suspensions which are added to the stock suspension during papermaking and contain, as a dispersant, from 0.1 to 2% by weight, based on the pigment, of a copolymer which contains, as copolymerized units,(a) from 40 to 95% by weight of an ester of (meth)acrylic acid with a saturated monohydric C.sub.1 -C.sub.8 -alcohol or with a saturated dihydric C.sub.2 -C.sub.4 -alcohol and(b) from 60 to 5% by weight of an ethylenically unsaturated C.sub.3 -C.sub.5 -carboxylic acidand has a K value of from 10 to 65 (determined according to H. Fikentscher in 1% aqueous solution in the form of the ammonium salt at pH 9 and at 20.degree. C.), their preparation and their use.
    Type: Grant
    Filed: April 16, 1987
    Date of Patent: January 31, 1989
    Assignee: BASF Aktiengesellschaft
    Inventors: Guenter Hirsch, Werner Auhorn
  • Patent number: 4774303
    Abstract: Polymers of acrylic acid or methacrylic acid are prepared by polymerizing acrylic acid and/or methacrylic acid at 50.degree.-180.degree. C. in a C.sub.2 -C.sub.6 -alcohol or mixtures thereof with water having a C.sub.2 -C.dwnarw.6.uparw.-alcohol content of not less than 40% by weight in the presence of free radical polymerization initiators and from 0.01 to 5% by weight, based on the monomers used, of inorganic acids of phosphorus in which the phosphorus has an oxidation number of from 1 to 4, or of water-soluble salts thereof, water-soluble --PO(OH).sub.2 -containing compounds and/or water-soluble salts thereof. The polymers thus prepared are effective milling aids and dispersants for pigments for producing aqueous pigment slurries for use in paper-coating compositions.
    Type: Grant
    Filed: January 29, 1987
    Date of Patent: September 27, 1988
    Assignee: BASF Aktiengesellschaft
    Inventors: Walter Denzinger, Heinrich Hartmann, Guenter Hirsch, Hans-Werner Becker, Michael Rohmann
  • Patent number: 4450013
    Abstract: The subject invention relates to compositions which are used as auxiliaries for pigment grinding and as dispersing agents for pigments. The compositions are essentially copolymers based upon acrylic acid, methacrylic acid, and sulfonic acid group containing monomers such as 2-acrylamido-2-methylpropanesulfonic acid.
    Type: Grant
    Filed: June 10, 1982
    Date of Patent: May 22, 1984
    Assignee: BASF Aktiengesellschaft
    Inventors: Guenter Hirsch, Gregor Ley
  • Patent number: 4302367
    Abstract: An improved paper-coating composition containing, per 100 parts by weight of finely divided pigment, from 5 to 25 parts by weight of one or more copolymers, having a glass transition temperature of from -40.degree. to 50.degree. C., in the form of an aqueous dispersion, and from 0.1 to 10 parts by weight of one or more water-soluble or water-swellable co-binders selected from the group comprising polyvinyl alcohol, cellulose ethers, starch, casein, alginates and high molecular weight carboxyl-containing emulsion polymers. The co-binder is added to the paper-coating composition in the form of a water-in-oil emulsion. Paper-coating compositions having high water retention are obtained, and papers coated with such compositions have improved water resistance.
    Type: Grant
    Filed: February 25, 1980
    Date of Patent: November 24, 1981
    Assignee: BASF Aktiengesellschaft
    Inventors: Claus Cordes, Guenter Hirsch, Heinrich Hartmann
  • Patent number: 4157995
    Abstract: An improved paper coating composition containing, per 100 parts by weight of finely divided pigment, from 5 to 25 parts by weight of a copolymer A having a glass transition temperature of from -40.degree. to +50.degree. C. in the form of an aqueous dispersion and from 0.1 to 10 parts by weight of a high molecular weight polymer B which is obtained by polymerizing water-soluble ethylenically unsaturated monomers in a water-in-oil emulsion. Papers having improved water resistance are obtained.
    Type: Grant
    Filed: January 16, 1978
    Date of Patent: June 12, 1979
    Assignee: BASF Aktiengesellschaft
    Inventors: Hans-Uwe Schenck, Guenter Hirsch
  • Patent number: D276910
    Type: Grant
    Filed: September 8, 1981
    Date of Patent: December 25, 1984
    Assignee: BASF Aktiengesellschaft
    Inventors: Emil Lohrer, Guenter Hirsch, Hans J. Wolf