Fibrillated polypyridobisimidazole floc
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United States of America Patent
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Mar 30, 2010
Grant Date -
Mar 26, 2009
app pub date -
Dec 19, 2006
filing date -
Dec 21, 2005
priority date (Note) -
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Abstract
The invention concerns a process for making a fibrillated polypyridobisimidazole floc comprising the steps of: cutting polypyridobisimidazole filaments to an average cut length of from about 0.5 to 10 mm; and applying energy to the polypyridobisimidazole filaments to produce a fibrillated floc having essentially the same average cut length after the application of energy as before the application of energy; where the fibrillated floc having a Canadian Standard Freeness (CSF), when dispersed in water by itself, of from about 400 to 750 ml.
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