Patent ID: 8398906

Claim:
A method for making a polymer-additive composite pulp, fibril or fibrid from a dope by: i) jet spinning the dope through a jet spin nozzle to obtain the pulp, fibril or fibrid, the dope including (a) a solvent that is selected from the group consisting of N-methyl-2-pyrrolidone, N,N′-dimethylformamide, N,N′-dimethylacetamide, tetramethylurea, and mixtures thereof; and (b) 4 to 75 wt % of a composition consisting of a para-aramid polymer and a solid additive, the para-aramid polymer being present in the composition in an amount of 2 to 80 wt % and the solid additive material being present in the composition in an amount of 20 to 98 wt %; wherein the para-aramid polymer is dissolved in the solvent; or ii) coagulating the dope to obtain the pulp, fibril or fibrid by means of a rotor-stator apparatus, in which the dope is applied through the stator on the rotor so that polymer-additive composite pulp, fibril or fibrid are precipitated and subjected to shear forces while the polymer-additive composite pulp, fibril or fibrid are in a plastic deformable stage, wherein said pulp, fibril or fibrid comprises a para-aramid polymer and a solid additive, the dope including (a) a solvent that is selected from the group consisting of N-methyl-2-pyrrolidone, N,N′-dimethylformamide, N,N′-dimethylacetamide, tetra-methylurea, and mixtures thereof; and (b) 4 to 75 wt % of a composition consisting of a para-aramid polymer and a solid additive, the para-aramid polymer being present in the composition in an amount of 2 to 80 wt % and the solid additive material being present in the composition in an amount of 20 to 98 wt %; wherein the para-aramid polymer is dissolved in the solvent.