Patent ID: 8883303
Filing Date: 2014-11-11
Classification: C08L,D01D,D01F,Y10T

Abstract:
1. A polymer-additive material composite particle, wherein the composite particle is pulp, fibril or fibrid, and wherein the composite particle is obtained from a dope in a method comprising: 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 further a non-fibrous, non-aramid solid additive, the para-aramid polymer being present in the composition in an amount of 2 to 80 wt % and the non-fibrous, non-aramid solid additive 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, tetramethylurea, and mixtures thereof; and (b) 4 to 75 wt % of a composition consisting of a para-aramid polymer and further a non-fibrous, non-aramid solid additive, the para-aramid polymer being present in the composition in an amount of 2 to 80 wt % and the non-fibrous, non-aramid solid additive being present in the composition in an amount of 20 to 98 wt %; wherein the para-aramid polymer is dissolved in the solvent; wherein, based on dry weight, the composite particle comprises 2 to 80 wt % of the para-aramid polymer and 20 to 98 wt % of the non-fibrous, non-aramid solid additive, wherein the para-aramid polymer is directly bonded to the non-fibrous, non-aramid solid additive such that the non-fibrous, non-aramid solid additive cannot be separated from the para-aramid polymer by filtration and washing, or any other mechanical or chemical separation procedure other than dissolving the para-aramid polymer in a solvent in which the non-fibrous, non-aramid solid additive is insoluble.