MODIFIED HYALURONIC ACID AND/OR SALT THEREOF, METHOD FOR PRODUCING SAME AND COSMETIC COMPRISING SAME
申请人:Kewpie Corporation
公开号:EP2537867A1
公开(公告)日:2012-12-26
A modified hyaluronic acid and/or a salt thereof comprises a glycerin skeleton-containing group shown by the following general formula (1),
-O-CH2-CHOH-CH2-OR1 (1)
wherein, R1 represents a linear or branched alkyl group, or a linear or branched alkenyl group.
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.