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:
Jun. 27, 1978
Filed:
Dec. 16, 1976
Applicant:
Inventors:
Arno Holst, Wiesbaden, DT;
Michael Kostrzewa, Wiesbaden, DT;
Assignee:
Hoechst Aktiengesellschaft, Frankfurt am Main, DT;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C08B / ; C08B / ;
U.S. Cl.
CPC ...
536 87 ; 106170 ; 536 66 ; 536 67 ; 536 91 ; 536 95 ; 536 96 ;
Abstract
Disclosed is a process for the chemical modification of a water-soluble cellulose ether, which comprises reacting the ether with a chloroformic acid ester in an aqueous organic medium containing alkali hydroxide, whereby the cellulose ether is rendered at least partially insoluble in water. The modified cellulose ether may be easily dispersed in water and redissolved to form a smooth solution of the original water-soluble ether by adding sufficient alkali to the dispersion to reuse its pH to at least about 11, preferably to about 12.