Claims
- 1. Para-aramid pulp consisting essentially of pulp-like short fibers comprised of bundles of sub-micron diameter fibrils of para-aramid free of sulfonic acid groups and having an inherent viscosity of between 2.0 and 4.5, having a diameter of between 1.mu. to 150.mu. and a length of between 0.2 mm and 35 mm, having a crystallinity index of less than 50, a crystallite size of less than 40 .ANG., and a surface area of greater than 2 m.sup.2 /g.
- 2. The para-aramid pulp of claim 1 wherein the inherent viscosity of said para-aramid is between 3.0 and 4.25.
- 3. The para-aramid pulp of claim 1 wherein said length is less than 13 mm.
- 4. Poly(p-phenylene terephthalamide) pulp consisting essentially of pulp-like short fibers comprised of bundles of sub-micron diameter fibrils of poly(p-phenylene terephthalamide) free of sulfonic acid groups and having an inherent viscosity of between 2.0 and 4.5, having a diameter of between 1.mu. to 150.mu. and a length of between 0.2 mm and 35 mm, having a crystallinity index of less than 50, a crystallite size of less than 40 .ANG., and a surface area of greater than 2 m.sup.2 /g.
- 5. The para-aramid pulp of claim 4 wherein said length is less than 13 mm.
- 6. Para-aramid pulp consisting essentially of pulp-like short fibers comprised of bundles of sub-micron diameter fibrils of para-aramid free of sulfonic acid groups and having an inherent viscosity of between 2.0 and 4.5, having a diameter of between 1.mu. to 150.mu. and a length of between 0.2 mm and 35 mm, having a crystallinity index of less than 50, a crystallite size of less than 40 .ANG., and a surface area of greater than 2 m.sup.2 /g, said fibrils having a wavy, structure and said fibers being fibrillated along the length of the fiber.
- 7. Para-aramid pulp consisting essentially of pulp-like uncollapsed, never-dried short fibers comprised of bundles of sub-micron diameter fibrils of para-aramid free of sulfonic acid groups and having an inherent viscosity of between 2.0 and 4.5, having a diameter of between 1.mu. to 150.mu. and a length of between 0.2 mm and 35 mm, and, when dried, having a crystallinity index of less than 50, a crystallite size of less than 40 .ANG., and a surface area of greater than 2 m.sup.2 /g, said short fibers containing at least 30% water based on the weight of the dry fiber.
Parent Case Info
This is a division of application Ser. No. 07/358,811, filed Jun. 5, 1989, now U.S. Pat. No. 5,028,372.
US Referenced Citations (9)
Divisions (1)
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Number |
Date |
Country |
Parent |
358811 |
Jun 1989 |
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