Paper comprising PIPD pulp and process for making same
AssigneeE. I. Du Pont de Nemours and Company
InventorsEdmund A. Merriman, Achim Amma, Mikhail R. Levit, Kevin A. Mulcahy
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Abstract
The invention concerns a paper comprising polypyridobisimidazole fibers, where the apparent density of the paper is from 0.1 to 0.5 g/cm3 and the tensile strength of the paper in N/cm is at least 0.00057X*Y, where X is the volume portion of polypyridobisimidazole in the total solids of the paper in % and Y is basis weight of the paper in g/m2.
Claims7
A paper formed from pulp comprising fibrillated polypyridobisimidazole fibers, wherein the apparent density of the paper is from 0.1 to 0.5 g/cm3 and the tensile strength of the paper in N/cm is at least 0.00057X*Y, where X is the volume portion of polypyridobisimidazole in the total solids of the paper in % and Y is basis weight of the paper in g/m2.
A process for making paper comprising the steps of:
- combining 50 to 98 parts by weight polypyridobisimidazole pulp and 2-50 parts by weight of a binder material, based on the total weight of the fiber and binder material, to form a dispersion;
- blending the dispersion to form a slurry;
- removing water from the slurry to form a wet paper composition;
- and
- drying the wet paper composition, wherein the paper has an apparent density of from 0.1 to 0.5 g/cm3 and a the tensile strength of the paper in N/cm is at least 0.00057X*Y, where X is the volume portion of PIPD pulp in the total solids of the paper in % and Y is basis weight of the paper in g/m2.
Dependencies are inferred from the claim text.