The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 09, 2013
Filed:
May. 28, 2010
Anton J. J. Hendriks, Lent, NL;
Jan M. Surquin, Arnhem, NL;
Mirjam E. Oldenzeel, Westervoort, NL;
Rene Journee, Duiven, NL;
Vincent A. Van Bommel, Zevenaar, NL;
Anton J. J. Hendriks, Lent, NL;
Jan M. Surquin, Arnhem, NL;
Mirjam E. Oldenzeel, Westervoort, NL;
Rene Journee, Duiven, NL;
Vincent A. Van Bommel, Zevenaar, NL;
Teijin Aramid B.V., Arnhem, NL;
Abstract
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'-dimethylformamide, N,N′-dimethylacetamide, tetramethylurea, and mixtures thereof; b) between 0.7 mole of an alkali or earth alkali chloride per mole amide groups of the para-aramid and 7.5 wt. % of the alkali or earth alkali 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.