Method for production of absorbent polymer
AssigneeNippon Shokubai Kagaku Kogyo Co., Ltd.
InventorsYoshinobu Haruna, Akito Yano, Yoshio Irie, Teruaki Fujihara
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Abstract
A method for the production of an absorbent polymer by the polymerization of a liquid containing an aqeous hydrophilic monomer solution in a reaction vessel provided with at least one rotary stirring blade, which comprises polymerizing said hydrophilic monomer in a reaction vessel wherein, at least a portion of the inner wall surface of said reaction vessel repeatedly exposed to said aqueous solution or said absorbent polymer and a gas has the surface roughness, R.sub.max, thereof adjusted to not more than 3 .mu.m and at the same time said portion of the inner wall of surface is kept cooled constantly to a temperature of not more than 70.degree. C. from behind said portion with a cooling medium.
Claims15
A method for the production of an absorbent polymer by the polymerization of a liquid containing an aqueous hydrophilic monomer solution composed of (A) at least one monomer selected from the group of acrylic acid, methacrylic acid, alkali metal salts and ammonium salts thereof, and (B) a cross-linking monomer possessing at least two polymerizing double bonds within the molecular unit thereof, the ratio of (B) said cross-linking monomer to (A) said monomer being in the range of 0.001 to 50 mol % in a reaction vessel provided with at least one rotary stirring blade, which comprises polymerizing said hydrophilic monomer in a reaction vessel wherein at least a portion of the repeatedly exposed inner wall surface has the surface roughness, R.sub.max, thereof adjusted to not more than 3 .mu.m and at the same time said portion is cooled constantly from behind said portion with a cooling medium having a temperature of not more than 50.degree. C.
Dependencies are inferred from the claim text.