Process for producing water-absorbing resins

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

1991-07-11

1995-01-10

Schofer, Joseph L.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Polymers from only ethylenic monomers or processes of...

52631843, 5263185, C08F22006

Patent

active

053808088

ABSTRACT:
The invention concerns a process for producing water-insoluble water-absorbing resins, which comprises the steps of initiating polymerization of an aqueous 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 aqueous solution together with (c) a polymerization initiator to a polymerizing apparatus capable of heating and/or cooling surfaces in contact with the aqueous solution, subsequently causing constant temperature polymerization of the solution without agitating the same by controlling the temperature of the system being polymerized to 20.degree. to 70.degree. C., and elevating, if necessary, the temperature ok the system to be in excess of 70.degree. 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.

REFERENCES:
patent: 4190562 (1980-02-01), Westerman
patent: 4342858 (1982-08-01), Herman et al.
patent: 4654039 (1987-03-01), Brandt et al.
patent: 4703067 (1987-10-01), Mikita et al.
patent: 4839395 (1989-06-01), Masamizu et al.
patent: 4857610 (1989-08-01), Chmelir

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