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:
May. 20, 1986
Filed:
Dec. 28, 1984
Applicant:
Inventors:
Mitsuru Yamashita, Himeji, JP;
Kouji Shima, Himeji, JP;
Assignee:
Daicel Chemical Industries, Ltd., Sakai, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C08B / ;
U.S. Cl.
CPC ...
536 69 ; 536 71 ; 536 73 ;
Abstract
Cellulose acetate is effectively prepared from cellulose and acetic anhydride in a solvent of acetic acid in the presence of a catalyst of sulfuric acid, when the reaction system is being evacuated at least before the reaction mixture reaches a boiling point thereof until the reaction completes, so that the vapor evolved from the reaction mixture may be condensed to distill off and the reaction product may be concentrated.