Method for producing improved water-absorbent resins
AssigneeArakawa Kagaku Kogyo Kabushiki Kaisha
InventorsMuneharu Makita, Shozo Tanioku
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Abstract
A method for easily, inexpensively and efficiently producing an improved water-absorbent resin having a high water absorbency and a high water absorption rate and capable of forming a gel having a high gel strength and nonstickiness, in which water-absorbent resin particles which contain water and a crosslinking agent and are in the semi-swollen state are agitated at an elevated temperature in the presence of an inert inorganic powder to conduct the crosslinking of the resin, while removing water, the water-absorbent resin containing a monomer units having a carboxyl group in the form of free acid or a metal salt.
Claims10
A method for producing an improved water-absorbent resin which comprises allowing a water-absorbent resin in the form of particles to absorb a crosslinking agent and water in the presence of a powder of an inert inorganic material, and heating the resulting mixture with agitation, thereby effecting a crosslinking reaction of said resin and removal of water, said resin containing units of a monomer having a carboxyl group in the form of free acid or a salt as a constituent component thereof.
Dependencies are inferred from the claim text.