Patents by Inventor Wolfgang Alewelt

Wolfgang Alewelt 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).

  • Glass fiber-reinforced polycarbonates with improved mechanical properties containing 0.5 to 5.0% of organopolysiloxane
    Patent number: 4147707
    Abstract: Glass fiber reinforced polycarbonate molding compositions are taught which have improved mechanical properties. This improvement is achieved by incorporating between about 0.5 to 5 wt.% of organopolysiloxanes into the composition. The compositions of this invention have improved impact, notched impact and elongation properties without a loss in elastic modulus.
    Type: Grant
    Filed: April 21, 1976
    Date of Patent: April 3, 1979
    Assignee: Bayer Aktiengesellschaft
    Inventors: Wolfgang Alewelt, Dieter Margotte, Hugo Vernaleken, Horst-Gunter Kassahn
  • Polycarbonates and a process for their preparation
    Patent number: 4127561
    Abstract: The present invention provides thermoplastic aromatic polycarbonates and a process for their production according to the phase boundary polycondensation process, characterized in that tertiary amines are employed as catalysts and are distilled beforehand over about 0.3-10% by weight, relative to the weight of the tertiary amine, of reducing agents and/or acid anhydrides with the exclusion of atmospheric oxygen.
    Type: Grant
    Filed: February 27, 1978
    Date of Patent: November 28, 1978
    Assignee: Bayer Aktiengesellschaft
    Inventors: Wolfgang Alewelt, Gunter Jacobs, Dieter Margotte, Erich Lux
  • Process for the preparation of diarylcarbonates
    Patent number: 4016190
    Abstract: A process for the preparation of a symmetric diarylcarbonate by reacting phosgene with a phenol wherein said reactions is carried out by the phase interface process in a diphastic mixture of an aqueous alkali metal hydroxide solution and a liquid diaryl carbonate in the presence of from 0.001 to 0.1 mol of a tertiary amine or a quaternary ammonium compound per mol of phenol.
    Type: Grant
    Filed: February 26, 1976
    Date of Patent: April 5, 1977
    Assignee: Bayer Aktiengesellschaft
    Inventors: August Bockmann, Claus Wulff, Hugo Vernaleken, Wolfgang Alewelt, Uwe Hucks
  • Thermoplastic compositions comprising aromatic polycarbonate urethanes
    Patent number: 3978157
    Abstract: Thermoplastic compositions of1. 30 to 70 parts by weight of a thermoplastic aromatic polycarbonate urethane obtained by reacting a low molecular weight aromatic polycarbonate having terminal chloroformic acid ester groups and a degree of polymerization P.sub.n of 1 to 20, preferably 1 to 10, with 1 to 15 mol %, based on the quantity of dihydroxy compound co-condensed in the polycarbonate, of disecondary aliphatic, cycloaliphatic or aromatic diamines, and2. 70 to 30 parts by weight of a mixture of2.1. 0 to 100 % by weight of a copolymer of monomers from the groups2.1.1. styrene, .alpha.-methyl styrene and/or2.1.2. acrylonitrile, methacrylonitrile, acrylic acid esters, methacrylic acid esters,2.2. 100 to 0 % by weight of a graft polymer of a monomer mixture of2.2.1. 95 to 50 % by weight of styrene, .alpha.-methyl styrene, methyl methacrylate or mixtures thereof,2.2.2. 5 to 50 % by weight of acrylonitrile, methacrylonitrile or mixtures thereofOn a rubber.
    Type: Grant
    Filed: February 12, 1975
    Date of Patent: August 31, 1976
    Assignee: Bayer Aktiengesellschaft
    Inventors: Ludwig Bottenbruch, Wolfgang Alewelt, Josef Merten