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:
Sep. 01, 1981
Filed:
Dec. 10, 1979
Applicant:
Inventors:
Heinrich Fauth, Mainz, DE;
Werner Koch, Hochheim-Massenheim, DE;
Assignee:
Hoechst Aktiengesellschaft, Frankfurt am Main, DE;
Primary Examiner:
Int. Cl.
CPC ...
C08B / ;
U.S. Cl.
CPC ...
536 60 ; 106165 ;
Abstract
Process for manufacturing viscose solutions having good filterability and producing low amounts of sulfide gases during subsequent spinning; said process comprising treating cellulose with a first alkali metal hydroxide solution in a first alkalization step, freeing the alkalized cellulose from at least part of the excess hydroxide solution without pressing-off, and treating the cellulose with a second alkali metal hydroxide solution in a second alkalization step while maintaining the temperature of the reaction mixture at not more than 18.degree. C.