Patents by Inventor Hans Birke

Hans Birke 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: 4182819
    Abstract: A process for the manufacture of vinyl chloride copolymers soluble in lacquer solvents with a clear solution consisting of copolymerizing vinyl chloride and at least one other olefinically-unsaturated compound copolymerizable with vinyl chloride under suspension copolymerization conditions in an aqueous dispersion and in the presence of (a) a monomer-soluble polymerization catalyst, (b) a water-soluble salt of a maleic acid anhydride mixed polymerizate of maleic acid anhydride, an olefinically unsaturated ester or ether of at least 7 carbon atoms, and another vinyl monomer, (c) from 0.003% to 0.007% by weight of a polyvinyl alcohol having a low viscosity and a high saponification number and (d) from 0.03% to 0.05% by weight of sodium chloride, whereby a vinyl chloride copolymer is obtained having the majority of its particles of a size between 0.1 and 0.5 mm.
    Type: Grant
    Filed: December 12, 1977
    Date of Patent: January 8, 1980
    Assignee: Wacker- Chemie GmbH
    Inventors: Johann Bauer, Hans Birke, Kurt Fendel, Harald Sulek