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:
Aug. 16, 2016
Filed:
Apr. 27, 2012
Eisuke Miyoshi, Wakayama, JP;
Yutaka Yoshida, Wakayama, JP;
Ryo Miyasato, Wakayama, JP;
Kenichi Shiba, Wakayama, JP;
Rui Takahashi, Wakayama, JP;
Yoichiro Imori, Wakayama, JP;
Eisuke Miyoshi, Wakayama, JP;
Yutaka Yoshida, Wakayama, JP;
Ryo Miyasato, Wakayama, JP;
Kenichi Shiba, Wakayama, JP;
Rui Takahashi, Wakayama, JP;
Yoichiro Imori, Wakayama, JP;
KAO CORPORATION, Tokyo, JP;
Abstract
The present invention relates to a method for producing an alkali cellulose with suppressed decrease in the degree of polymerization as well as with small use amount of a basic compound, and to a method for producing a cellulose ether by using the alkali cellulose thus obtained. Provided by the present invention are: (A) a method for producing an alkali cellulose, comprising Step 1 wherein a cellulose-containing raw material is pulverized in the presence of 0.6 to 1.5 mol of a basic compound relative to 1 mol of an anhydroglucose unit that constitutes a cellulose in the said cellulose-containing raw material and under the condition in which the water content therein relative to the cellulose in the cellulose-containing raw material is 10% or less by mass thereby obtaining a cellulose powder mixture having the median diameter of the cellulose-containing raw material made 150 μm or less and Step 2 wherein water content therein is adjusted in the range of 30 to 100% by mass relative to the cellulose by adding water to the cellulose powder mixture thereby obtaining the alkali cellulose in the powder form; and (B) a method for producing a cellulose ether by reacting the alkali cellulose produced by the foregoing production method with an etherification agent.