Patent ID: 6174978
Filing Date: 2001-01-16
Classification: C08F,Y02P

Abstract:
A static polymerization production process for producing a water-absorbent resin, with the static polymerization production process taking place in a polymerization apparatus, with the polymerization apparatus comprising a contact face, with the polymerization apparatus including a polymerization system, with the polymerization system comprising an aqueous solution and resultant hydrogel polymer after the start of polymerization in the aqueous solution, with the polymerization system being in contact with the contact face of the polymerization apparatus, with the static polymerization process comprising the steps of:a) polymerizing statically the aqueous solution, wherein the aqueous solution has a thickness of 10-50 mm, and wherein the aqueous solution includes a hydrophilic monomer to obtain the hydrogel polymer; andb) controlling the maximum attained temperature of the polymerization system in a range of 60-95.degree. C. by drawing a given amount of heat away from the polymerization system, with the step of drawing a given amount of heat away from the polymerization system comprising the steps of:i) drawing heat from the polymerization system via the step of applying a heat conductive process to the contact face of the polymerization apparatus; andii) drawing heat from the polymerization system via the step of conveying an inert gas into and out of the polymerization apparatus to draw out the latent heat of vaporization, with an amount of the inert gas being conveyed into and out of the polymerization apparatus being in excess of that which is required to prevent oxygen from entering the polymerization apparatus.