| 摘要 |
PCT No. PCT/KR90/00005 Sec. 371 Date Apr. 22, 1991 Sec. 102(e) Date Apr. 22, 1991 PCT Filed Jun. 8, 1990 PCT Pub. No. WO90/15829 PCT Pub. Date Dec. 27, 1990.The processes for producing highly water absorptive resins of the present invention comprise the following steps: (A) suspending an aqueous solution of partially neutralized alkali metal acrylate and optionally partially neutralized acrylamido alkane sulfonate in a hydrocarbon solvent containing a surfactant having a HLB value of 3 APPROX 6 or 8 APPROX 12; (B) subjecting the mixture to inverse suspension polymerization in the presence of at least one water soluble radical polymerization initiator; (C) if necessary, separating the moisture from the produced polymer by azeotropic distillation to reduce the water content to about 15 to 55% by weight; (D) adding a crosslinking agent having two or more reactive groups such as epoxy groups, if desired, as a solution form to subject the surface of the polymer to crosslinking reaction; and optionally (E) subjecting to coagulation with the use of a coagulant in the presence of an inert solvent, whereafter drying the resultant coagulate to obtain the water absorptive resin.
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