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:
Oct. 30, 1984
Filed:
Oct. 31, 1983
Applicant:
Inventor:
Richard J Brewer, Kingsport, TN (US);
Assignee:
Eastman Kodak Company, Rochester, NY (US);
Attorneys:
Primary Examiner:
Int. Cl.
CPC ...
C08B / ;
U.S. Cl.
CPC ...
536 59 ;
Abstract
The present invention relates to the preparation of water soluble cellulose sulfate esters. More particularly, it relates to an improved process of preparing cellulose sulfate esters wherein cellulose is slurried in dimethylformamide. To this cellulose-dimethylformamide slurry is then added liquid denitrogen tetroxide to form the cellulose nitrite ester. The cellulose nitrite ester is then converted to the water soluble cellulose sulfate ester by reacting with acetylsulfuric acid in an anhydrous reaction medium.