Patents Assigned to GmbH Rohm
  • Patent number: 4892910
    Abstract: Polymer powders comprising aggregated polymer particles, said powders having a low content of fines and being suitable as processing aids in the manufacture of polyvinyl chloride, are made by spray drying an aqueous dispersion (latex) of two emulsion polymers, one of which has a dynamic glass transition temperature above C. and the other of which has a dynamic glass transition below C., the latter being at least 10 K. degrees below the former.
    Type: Grant
    Filed: July 13, 1988
    Date of Patent: January 9, 1990
    Assignee: GmbH Rohm
    Inventors: Wolfgang Klesse, Hubert Rauch, Peter J. Arndt, Norbert Suetterlin
  • Patent number: 4622358
    Abstract: What are disclosed are concentrated emulsions of an olefin copolymer in a liquid carrier medium which does not dissolve the copolymer and, as an emulsifier, a graft or block copolymer of the formulaA--Y,wherein A represents a sequence or segment of an olefin copolymer, of hydrogenated polyisoprene, or of an hydrogenated butadiene/isoprene copolymer, and Y represents a sequence or segment, formed by the polymerization of vinyl monomers which essentially are not of the acrylate or methacrylate type, which is soluble in the carrier medium, as well as methods for making the same.
    Type: Grant
    Filed: March 29, 1985
    Date of Patent: November 11, 1986
    Assignee: GmbH Rohm
    Inventors: Horst Pennewiss, Roland Schweder, Helmut Knoell