| abstract |
The invention concerns a fibrous pulp comprising polypyridobisimidazole fiber, the pulp having a Canadian Standard Freeness (CSF) of no more than about 650 ml, a specific surface area of from 0.5 to 50 square meters per gram, a length-weighted average length of from 0.5 to 2.0 mm, and a equilibrium moisture content of greater than 10 percent by weight. Also provided are papers made from such pulp and processes for making the pulp. |