Patent ID: 8444815
Filing Date: 2013-05-21
Classification: C09K,D21B,D21H,F16D

Abstract:
1. A process for making a fibrous pulp comprising fibrillated polypyridobisimidazole fibrous structures and fibrous structures derived from another polymer, comprising: (a) combining pulp ingredients including: (b) mixing the ingredients to a substantially uniform slurry; (c) co-refining the slurry by simultaneously: (d) removing water from the refined slurry, thereby producing a fibrillated pulp with the fibrillated polypyridobisimidazole fibrous structures and fibrous structures derived from another polymer, the fibrous structures having an average maximum dimension of no more than 5 mm, a length-weighted average length of no more than 1.3 mm, the fibrils and/or stalks of the polypyridobisimidazole fibrous structures being substantially entangled with the fibrils and/or stalks of the fibrous structures derived from another polymer.