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:
Mar. 29, 1988
Filed:
Mar. 03, 1986
Michael Diamantoglou, Erlenbach, DE;
Gerhard Meyer, Obernburg, DE;
Akzo NV, Arnheim, NL;
Abstract
Water-insoluble fibers of cellulose monoester of maleic acid, succinic acid, or phthalic acid having an extremely high absorption ability for water and physiological liquids are produced by (a) preparing at 20.degree. to 80.degree. C. a solution of activated cellulose in dimethylacetamide or 1-methyl-2-pyrrolidon containing 5 to 30% by weight activated cellulose of an average degree of polymerization from 300 to 800 and 3 to 20% by weight LiCl, (b) reacting the solution with a corresponding carboxylic acid anhydride in a mol ratio from 1:0.20 to 1:4 at 20.degree. to 120.degree. C. in the presence of known esterification catalyst until a degree of esterification from 0.1 to 1.7, (c) wet-spinning the cellulose monoester solution into a coagulation agent, with or without (d) converting the fibers of cellulose monoester of phthalic acid and, if necessary, the of cellulose monoester of maleic acid or succinic acid, in a substantially organic solvent by means of reaction with alkali metal hydroxide, alkali metal alcoholate, ammonia, primary or secondary amines, partially or completely into fiber-shaped salts.