Resources Contact Us Home
Polymeric medium

Image Number 11 for United States Patent #8129498.

A PBI compound includes imidazole nitrogens at least a portion of which are substituted with a moiety containing a carbonyl group, the substituted imidazole nitrogens being bonded to carbon of the carbonyl group. At least 85% of the nitrogens may be substituted. The carbonyl-containing moiety may include RCO--, where R is alkoxy or haloalkyl. The PBI compound may exhibit a first temperature marking an onset of weight loss corresponding to reversion of the substituted PBI that is less than a second temperature marking an onset of decomposition of an otherwise identical PBI compound without the substituted moiety. The PBI compound may be included in separatory media. A substituted PBI synthesis method may include providing a parent PBI in a less than 5 wt % solvent solution. Substituting may use more than 5 equivalents in relation to the imidazole nitrogens to be substituted.

  Recently Added Patents
Gas cap removal tool
Systems, devices, methods, and compositions including fluidized x-ray shielding compositions
Multiplanar image displays and media formatted to provide 3D imagery without 3D glasses
Method and apparatus for user selection of advertising combinations
Clock face
Identification of websites that break out of frames
Power-on reset circuit
  Randomly Featured Patents
Avalanche photodiode with moisture resistant passivation coating disposed to cover the outer periphery of the photodiode body except at a selected top contact area
Apparatus for modifications of visual acuity by thermal means
Back contact for thin film solar cells
Magnetic support structure for an elevator tube of a vertical rapid thermal processing unit
Article theft detection
Unmanned chain hook-up for lifting loose bundles
Glycolipid and medicine for autoimmune disease containing the same as active ingredient
Active matrix display device and method therefor
Photoconductive N-vinyl carbazole copolymers and process for preparing same
Method and apparatus for processing and harvesting trees