Process for producing water-absorbing resins

Details Process for producing water-absorbing resins Process for producing water-absorbing resins

C - Chemistry, Metallurgy

08

F

C08F 2/10 (2006.01) C08L 57/00 (2006.01)

Patent

CA 2046688

Abstract The invention concerns a process for producing water- insoluble water-absorbing resins. which comprises the steps of initiating polymerization of an aquaous solution containing 30 to 80 % by weight of (a) a hydrophilic vinyl monomer having a functional group and (b) a crosslinking agent by supplying the aquaous solution together with (c) a polymerization initiator to a polymerizing apparatus capable of heating and/or cooling surfaces in contact with the aquaous solution, subsequently causing constant temperature polymerization of the solution without agitating the same by controlling the temperature of the system being polymerized to 20 to 70 °C, and elevating, if necessary, the temperature of the system to be in excess of 70 °C in a stage with a polymerization percentage of 70 % or above before completion of polymerization. Obtainable water-insoluble water-absorbing resins have excellent water-absorbing property and have less water-soluble components. Thus, the water- absorbing resins according to the invention are useful for physiological commodities, paper diapers or like sanitary materials, drip absorbing materials, cold water retainers, dew condensation prevention materials for construction materials and so forth.

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