Patents by Inventor Tilo Vaahs

Tilo Vaahs 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).

  • Polysilazanes, processes for their preparation, ceramic materials which contain silicon nitride and can be prepared from them, and preparation thereof
    Patent number: 5030702
    Abstract: The invention relates to novel polysilazanes, their preparation, their further processing to ceramic material containing silicon nitride and this material itself. To prepare the polysilazanes, Si,Si'-diorganyl-N-alkyltetrachloro-disilazanes of the formula RSiCl.sub.2 -NR'-SiCl.sub.2 R are reacted with ammonia. The polysilazanes can then be pyrolyzed to ceramic material containing silicon nitride. The polysilazanes according to the invention dissolve in the customary aprotic solvents.
    Type: Grant
    Filed: March 21, 1990
    Date of Patent: July 9, 1991
    Assignee: Hoechst Aktiengesellschaft
    Inventors: Tilo Vaahs, Hans-Jerg Kleiner, Marcellus Feuckert, Martin Bruck
  • Polymeric ethylene-bridged chlorosilazanes, process for their preparation, ceramic materials which can be prepared from them containing silicon nitride, and their preparation
    Patent number: 5011801
    Abstract: Polymeric ethylene-bridged chlorosilazanes, process for their preparation, ceramic materials which can be prepared from them containing silicon nitride, and their preparationThe invention relates to novel polymeric ethylene-bridged chlorosilazanes, their preparation, their further processing to a ceramic material containing silicon nitride, and this material itself. In order to prepare the polymeric chlorosilazanes, oligosilazanes of the formula (I) ##STR1## are reacted with at least one of the chlorosilanes ##STR2## in which R.sup.1 to R.sup.5 are C.sub.1 -C.sub.6 -alkyl or C.sub.2 -C.sub.6 -alkenyl groups, which may be identical or different.The polymeric chlorosilazanes according to the invention can be converted by reaction with ammonia into polysilazanes, which in their turn can be pyrolysed to ceramic materials containing silicon nitride.
    Type: Grant
    Filed: November 30, 1989
    Date of Patent: April 30, 1991
    Inventors: Tilo Vaahs, Marcellus Peuckert, Martin Bruck
  • Polymeric hydridothiosilazanes, processes for the preparation thereof, silicon nitride-containing ceramic materials which can be prepared therefrom, and the preparation thereof
    Patent number: 4952670
    Abstract: Polymeric hydridothiosilazanes, processes for the preparation thereof, silicon nitride-containing ceramic materials which can be prepared therefrom, and the preparation thereof.The invention relates to novel polymeric hydridothiosilazanes, the preparation thereof, the conversion thereof into silicon nitride-containing ceramic material, and this material itself. To prepare the polymeric hydridothiosilazanes, oligohydridoalkylsilazanes (RSiHNH).sub.n are reacted with elemental sulfur and ether as solvents. The polymeric hydridothiosilazanes can then be pyrolyzed to form silicon nitride-containing ceramic material.
    Type: Grant
    Filed: December 22, 1988
    Date of Patent: August 28, 1990
    Assignee: Hoechst Aktiengesellschaft
    Inventors: Tilo Vaahs, Hans-Jerg Kleiner, Marcellus Peuckert, Martin Bruck
  • Polysilazanes, processes for their preparation, ceramic materials which contain silicon nitride and can be prepared from them, and preparation thereof
    Patent number: 4946920
    Abstract: The invention relates to novel polysilazanes, their preparation, their further processing to ceramic material containing silicon nitride and this material itself. To prepare the polysilazanes, Si,Si'-diorganyl-N-alkyl-tetrachloro-disilazanes of the formula RSiCl.sub.2 -NR'-SiCl.sub.2 R are reacted with ammonia. The polysilazanes can then be pyrolyzed to ceramic material containing silicon nitride. The polysilazanes according to the invention dissolve in the customary aprotic solvents.
    Type: Grant
    Filed: December 2, 1988
    Date of Patent: August 7, 1990
    Assignee: Hoechst Aktiengesellschaft
    Inventors: Tilo Vaahs, Hans-Jerg Kleiner, Marcellus Peuckert, Martin Bruck
  • Polymeric hydridosilazanes, processes for the preparation thereof, silicon nitride-containing ceramic materials which can be prepared therefrom, and the preparation thereof
    Patent number: 4939225
    Abstract: Polymeric hydridosilazanes, processes for the preparation thereof, silicon nitride-containing ceramic materials which can be prepared therefrom, and the preparation thereof.The invention relates to novel polymeric hydridosilazanes, their preparation, their conversion into silicon nitride-containing ceramic material, and this material itself. To prepare the polymeric hydridosilazanes, polymeric hydridothiosilazanes are reacted with NH.sub.3. To prepare the silicon nitride-containing ceramic material, the polymeric hydridosilazanes are then pyrolyzed.
    Type: Grant
    Filed: December 23, 1988
    Date of Patent: July 3, 1990
    Assignee: Hoechst Aktiengesellschaft
    Inventors: Tilo Vaahs, Thomas Gerdau, Marcellus Peuckert, Martin Bruck
  • Polysilazanes, process for the preparation thereof, silicon nitride-containing ceramic materials which can be prepared therefrom, and the prepaation thereof
    Patent number: 4935481
    Abstract: The invention relates to novel polysilazanes, the preparation thereof, the further processing thereof to form silicon nitride-containing ceramic material, and this material itself. In order to prepare the polysilazanes, dialkylaminoorganyldichlorosilanes of the formula RsiCl.sub.2 -Nr'R' are reacted with ammonia. The polysilazanes can then be pyrolyzed to form silicon nitride-containing ceramic material. The polysilazanes according to the invention dissolve in customary aprotic solvents.
    Type: Grant
    Filed: November 3, 1988
    Date of Patent: June 19, 1990
    Assignee: Hoechst Aktiengesellschaft
    Inventors: Tilo Vaahs, Hans-Jerg Kleiner, Marcellus Peuckert, Martin Bruck, Fritz Aldinger
  • Si,Si'diorganyl-N-alkyl-tetrachloro-disilazanes and a process for their preparation
    Patent number: 4882448
    Abstract: The invention relates to a process for the preparation of Si,Si'-diorganyl-N-alkyl-tetrachloro-disilazanes of the formula RSiCl.sub.2 --NR'--SiCl.sub.2 R, in which R is C.sub.1 -C.sub.4 -alkyl, vinyl or phenyl and R' is C.sub.1 -C.sub.4 -alkyl, and to these compounds themselves, with the exception of those where R=R'=CH.sub.3. To prepare the compounds mentioned, organyltrichlorosilanes RSiCl.sub.3 and monoalkylamines R'NH.sub.2 are reacted with one another in an aprotic solvent at -10.degree. C. to +70.degree. C., the molar ratio of RSiCl.sub.3 :R'NH.sub.2 being at least 0.3:1.
    Type: Grant
    Filed: December 2, 1988
    Date of Patent: November 21, 1989
    Assignee: Hoechst Aktiengesellschaft
    Inventor: Tilo Vaahs