Unsymmetrical peroxides could be prepared easily by reaction of alkyl hydroperoxides with primary and secondary alkyl bromides and methanesulfonates in tetrahydrofuran in the presence of potassium hydroxide and polyethyleneglycol 400.
GRANULATED WATER ABSORBENT CONTAINING WATER-ABSORBING RESIN AS THE MAIN COMPONENT
申请人:Nippon Shokubai Co., Ltd.
公开号:EP2116572A1
公开(公告)日:2009-11-11
Provided is a particulate water-absorbent agent having suppressed reduction of absorption capacity, after elapse of a long time, good gel layer diffusion performance and reduced Re-wet, a water-absorbent goods containing the water-absorbent agent, and a production method for the water-absorbent agent. The above problem is solved by a particulate water-absorbent agent having a polyacrylate salt-type water-absorbent resin as a main component, and having an absorption capacity without load of equal to or higher than 28 g/g, characterized by satisfying the following (a) to (c):
(a) amount of water-soluble component under stirring is from 15 to 60% by mass;
(b) difference between an amount of water-soluble component under stirring and an amount of water-soluble component in standing still (amount of water-soluble component under stirring - amount of water-soluble component in standing still) is from 15 to 50% by mass; and
(c) diffusion absorption index is from 1.40 to 10.0 g/g/min;
wherein the amount of water-soluble component under stirring represents amount of a dissolution polymer after 16 hours, to a normal saline solution under stirring, and the amount of water-soluble component in standing still represents amount of a dissolution polymer after 16 hours, to a normal saline solution in standing still.