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
Brushless motor drive apparatus and drive method
Adaptive block pre-fetching method and system
Power or voltage oscillation damping in a power transmission system
High sensitivity stress sensor based on hybrid materials
Aware manufacturing of integrated circuits
Portable stand
Connector interface for a cable
  Randomly Featured Patents
Generating PES using readback signal distortion
Tire with worn tread indicator
System and method of IP packet forwarding across directly connected forwarding elements
User authorization verification apparatus for computer systems including a central device and a plurality of pocket sized remote units
Rebate processing system and method providing promotions database and interface
Lid for a container
In-place repeater insertion methodology for over-the-block routed integrated circuits
3'-(Substituted phenyl)-spiro[isobenzofuran-1(3H),5'(4'H)-isoxazol]-3-ones and their use as herbicides
Process for preparing unsaturated amides and carboxylic acids
Using a partial metal level mask for early test results