Patents by Inventor Marina K. Dobrokhtova

Marina K. Dobrokhtova 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).

  • Preparation of dodecalactam polymers wherein molten monomer is filtered prior to polymerization
    Patent number: 4368318
    Abstract: The method for preparing polydodecanamide or copolymers based thereon according to the present invention involves melting of .omega.-dodecalactam or a mixture thereof with amide-forming monomers and polymerization of the resulting melt at a temperature ranging from 180.degree. to 320.degree. C. in the presence of a catalyst and a molecular-mass regulator. According to the invention, prior to polymerization the resulting melt is filtered through a filtering bed comprising solid oxidized particles of .omega.-dodecalactam with an elemental content of oxygen of from 10 to 24% by mass.
    Type: Grant
    Filed: September 5, 1980
    Date of Patent: January 11, 1983
    Inventors: Marina K. Dobrokhtova, Bladimir A. Evseev, Evgeny S. Artsis, Gennady A. Enenshtein, Boris P. Cheburashko, Maria G. Platoshkina, Vladimir P. Nefedov, Ljudmila I. Valyshkina