Patents by Inventor Friedrich Mertes

Friedrich Mertes 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: 4060517
    Abstract: An improved process for the continuous manufacture of polyamides by continuously conveying the aqueous solution of a salt of essentially equivalent amounts of a diamine, or of a mixture of several diamines, and of a dicarboxylic acid, or of a mixture of several dicarboxylic acids, or of mixtures of such salts with lactams and/or aminocarboxylic acids, through several reaction zones under polyamide-forming conditions, wherein the mixture of starting materials is heated, in a first reaction zone, to from 200.degree. to 300.degree. C, preferably from 220.degree. to 280.degree. C, at pressures which are above the corresponding saturation vapor pressure of water and prevent the formation of a vapor phase, the pressure action on the polycondensation mixture is released in a second reaction zone and condensation of the mixture, to form high molecular weight polyamides, is then completed in further reaction stages. According to the invention,A.
    Type: Grant
    Filed: March 17, 1975
    Date of Patent: November 29, 1977
    Assignee: BASF Aktiengesellschaft
    Inventors: Friedrich Mertes, Helmut Doerfel, Eduard Heil, Claus Cordes