Patents by Inventor Gunther Nowy

Gunther Nowy 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).

  • Polymeric polyalkyl-1-oxa-diazaspirodecanes
    Patent number: 5169925
    Abstract: Novel polymeric polyalkyl-1-oxa-diazaspirodecanes of the formula I ##STR1## are very effective stabilizers for natural any synthetic polymers. They have very low volatility, high migration resistance and high thermal stability.
    Type: Grant
    Filed: June 14, 1990
    Date of Patent: December 8, 1992
    Assignee: Hoechst Aktiengesellschaft
    Inventors: Georg Schmailzl, Gerhard Pfahler, Gunther Nowy
  • Process for the preparation a bis(3,3-bis(4-hydroxyalkylphenyl)butanoic acid)diol ester
    Patent number: 5107043
    Abstract: By dividing the known condensation of acetoacetic acid diol esters with phenols into two process steps, a reduction in the cost of the entire process can be achieved.Methyl acetoacetate is first condensed with a phenol and the methyl 3,3-bis(4-hydroxyalkylphenyl)butanoate formed is reacted with the desired diol in the presence of a transesterification catalyst. In this way only one acetoacetic ester is necessary for various final products. The final products are useful stabilizers for plastics, in particular polyolefins.
    Type: Grant
    Filed: October 31, 1990
    Date of Patent: April 21, 1992
    Assignee: Hoechst Aktiengesellschaft
    Inventors: Georg Schmailzl, Josef Wiedemann, Gerhard Pfahler, Gunther Nowy
  • Process for the preparation of 2,2,6,6-tetramethylpiperidone-4
    Patent number: 4356308
    Abstract: In the synthesis of 2,2,6,6-tetramethylpiperidone-4 (triacetone-amine) from acetone and ammonia, a partially halogenated or perhalogenated aliphatic or cyclic hydrocarbon is used as catalyst in an amount of from 0.01 to 5 mol %, relative to acetone.
    Type: Grant
    Filed: March 27, 1981
    Date of Patent: October 26, 1982
    Assignee: Hoechst Aktiengesellschaft
    Inventors: Hartmut Wiezer, Gunther Nowy, Harald Haberlein
  • Alkylated diaza-spirodecanes
    Patent number: 4319030
    Abstract: The invention provides derivatives of polyalkyl-1-oxa-diaza-spirodecanes prepared from compounds of the formula ##STR1## in which X is ##STR2## and mono- or dihalo-hydrocarbons by alkylation at the nitrogen atom of the 5-membered ring, and the salts thereof. The novel compounds are migration-resistant light stabilizers of low volatility for synthetic polymers.
    Type: Grant
    Filed: August 18, 1980
    Date of Patent: March 9, 1982
    Assignee: Hoechst Aktiengesellschaft
    Inventors: Hartmut Wiezer, Gerhard Pfahler, Harald Haberlein, Gunther Nowy
  • Process for preparing condensation products of phenols and acetoacetic acid esters
    Patent number: 4022819
    Abstract: When replacing the low molecular mercaptan used as a catalyst in the known process for preparing condensation products of phenols and acetoacetic acid esters by an n-alkyl mercaptan having of from 8 to 20 carbon atoms, the yield is improved and the reaction time reduced, while the working up of the reaction batch is simultaneously improved.
    Type: Grant
    Filed: December 22, 1975
    Date of Patent: May 10, 1977
    Assignee: Hoechst Aktiengesellschaft
    Inventors: Otto Mauz, Norbert Mayer, Gunther Nowy