Resources Contact Us Home
Browse by: INVENTOR PATENT HOLDER PATENT NUMBER DATE
 
 
Method for converting Si-H containing polysiloxanes to new and useful preceramic polymers and ceramic materials










Image Number 3 for United States Patent #4705837.

A method of forming preceramic polymers using a polysiloxane having repeat units of the formula [RSi(H)O].sub.n (where R is a lower alkyl group having from 1 to about 6 carbon atoms, a cycloalkyl group having from 3 to about 6 carbon atoms, a substituted or unsubstituted lower aryl group having from 6 to about 10 carbon atoms, n is an integer 1 or greater), by reacting it with a (poly)silylamide is disclosed. Preferably, the poly(silylamide) is a polymeric alkali metal silylamide of the formula [(R.sup.1 SiHNH).sub.a (R.sup.1 SiN).sub.b (R.sup.1 SiHNM).sub.c ].sub.m where a+b+c=1; R.sup.1 is a lower alkyl group having from 1 to about 6 carbon atoms, a substituted or unsubstituted cycloalkyl group having from 2 to about 6 carbon atoms, a substituted or unsubstituted alkenyl group having from 2 to about 6 carbon atoms, a substituted or unsubstituted lower aryl group having from 6 to about 10 carbon atoms, a tri(lower)alkyl- or di(lower)alkylsilyl group or a di(lower)alkylamino group; M is an alkali metal or one-half equivalent of an alkaline earth metal; and m is an integer greater than 1. Preferably, a weight ratio of polysiloxane:silylamide of 15:1 to 1:15 is used. Novel preceramic polymers formed by this method are also disclosed.








 
 
  Recently Added Patents
Image forming apparatus and job request control method instructed by authenticated users
Treatment devices with deliver-activated inflatable members, and associated systems and methods for treating the spinal cord and other tissues
Rotation angle sensor
Configurable pitch reducing optical fiber array
Mobile target system
Optical disc drive having a tray for loading a disc using supporting portions
Battery power management system and method
  Randomly Featured Patents
Method for transfer of thin-film of silicon carbide via implantation and wafer bonding
Exhaust system of internal combustion engine
Packaging method and apparatus
Medical data encryption for communication over a vulnerable system
Lightweight stowable and deployable solar cell array
Welding positioning system for seam welding
Adenosine receptor antagonists and methods of making and using the same
Method for laser drilling a counter-tapered through-hole in a material
System and method for power-efficient charging and discharging of a capacitive load from a single source
Programmable electronic control unit for water distribution systems, particularly for the irrigation of gardens, lawns, kitchen gardens, terraces and balconies