Patents by Inventor Wilfried Eichhorn

Wilfried Eichhorn 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: 4277592
    Abstract: A tertiary N-vinylamide is polymerized, optionally together with further monomers, in the presence of an aliphatic hydrocarbon, at a temperature of from to C., using two types of initiator one of which is insoluble and the other soluble in the hydrocarbon used. The pulverulent or granular polymer obtained has a diminished content of residual monomer. It is suitable as protective colloid or dispersing agent for emulsion or suspension polymerizations.
    Type: Grant
    Filed: July 3, 1979
    Date of Patent: July 7, 1981
    Assignee: Hoechst Aktiengesellschaft
    Inventor: Wilfried Eichhorn
  • Patent number: 4230643
    Abstract: Copolymers of vinyl esters and crotonic acid are commonly prepared by polymerizing the monomers in bulk or in solution by means of a radical-forming initiator in the presence of a regulator. The polymers should be free from residual monomers and impurities as far as possible. This may be realized in that upon completion of the polymerization the unreacted monomers and other volatile impurities are removed from the reaction mixture by distillation. For this purpose, the use of an entrainer is advantageous. The copolymers are suitable as starting materials for adhesives and hair lacquers, hair setting lotions as well as hair sprays.
    Type: Grant
    Filed: October 31, 1978
    Date of Patent: October 28, 1980
    Assignee: Hoechst Aktiengesellschaft
    Inventors: Wilfried Eichhorn, Peter Seibel