초록 ▼

A process for improving a water absorbent polyacrylic acid polymer in which the polymer is contacted with an aqueous solution containing a water soluble peroxide radical initiator, followed by heating, thereby causing substantially only the surface portion of the polymer to undergo crosslinking with

A process for improving a water absorbent polyacrylic acid polymer in which the polymer is contacted with an aqueous solution containing a water soluble peroxide radical initiator, followed by heating, thereby causing substantially only the surface portion of the polymer to undergo crosslinking with the radical initiator while leaving the remaining core portion of the polymer substantially intact. The improved water absorbent polyacrylic acid polymer is excellent in both water absorbency and water absorption rate, and the hydrogel resulting from absorption of water has a pleasant, non-sticky feel. The improved water absorbent polyacrylic acid polymer can be advantageously utilized to produce a desirable disposable diaper, sanitary napkin, surgical pad, surgical sheet, paper towel or the like.

대표청구항 ▼

A process for improving a water absorbent polyacrylic acid polymer with respect to absorption characteristics thereof which comprises the steps of: (1) contacting with the surface of a water absorbent polyacrylic acid polymer an aqueous solution containing a water soluble peroxide radical initiator,

A process for improving a water absorbent polyacrylic acid polymer with respect to absorption characteristics thereof which comprises the steps of: (1) contacting with the surface of a water absorbent polyacrylic acid polymer an aqueous solution containing a water soluble peroxide radical initiator, the weight ratio of the water in said aqueous solution to said polymer being from 0.01 to 0.5, thereby causing said polymer substantially only at its surface portion to have said solution absorbed therein; and (2) heating the resulting polymer with its surface portion having said solution absorbed therein at a temperature such that said initiator is decomposed but said polymer is not decomposed, thereby causing said polymer at its surface portion to undergo crosslinking by the action of said initiator while leaving the remaining core portion of said polymer substantially intact.