Loading patent…
AssigneeTeijin Twaron GmbH
InventorsAnton Hendriks, Jan Surquin, Mirjam Oldenzeel, Rene Journee, Vincent Van Bommel
Estimating the term…
The invention relates to a non-fibrous polymer solution essentially consisting of 1 to 8 wt. % para-aramid, at least 50 mole % of the aromatic moieties thereof being unsubstituted, in a mixture of a) a polar amide solvent selected from N-methyl-2-pyrrolidone, N,N′-dimethyl-formamide, N,N′-dimethylacetamide, tetramethylurea, and mixtures thereof; b) between 0.7 mole of an alkali or alkaline earth metal chloride per mole amide groups of the para-aramid and 7.5 wt. % of the alkali or alkaline earth metal chloride, and c) water; and wherein at least 50 wt. % of the formed hydrochloric acid has been neutralized to obtain a solution having a dynamic viscosity which is at least a factor three smaller than the dynamic viscosity of the polymer solution without neutralization. The invention further pertains to a process making the same and para-aramid pulp-like fiber, paper and film made from said polymer solution.
A non-fibrous polymer solution comprising 1 to 8 wt. % para-aramid, wherein at least 50 mole % of aromatic moieties of the para-aramid are unsubstituted, in a mixture of a) a polar amide solvent selected from a group consisting of N-methyl-2-pyrrolidone, N,N′-dimethylformamide, N,N′-dimethylacetamide, tetramethylurea, and mixtures thereof;
A para-aramid pulp-like fiber having a structural irregularity expressed as a difference in Canadian Standard Freeness (CSF) of never dried pulp and dried pulp of at least 100.
Dependencies are inferred from the claim text.