Mixture of surface postcrosslinked superabsorbers with different surface postcrosslinking

摘要

A mixture of superabsorbents having differing surface postcrosslinking, more particularly a mixture of differingly surface-postcrosslinked sieve cuts of a base polymer, exhibits improved absorption and retention over a unitarily surface-postcrosslinked superabsorbent.

主权项

1. A process for producing a mixture of superabsorbents having differing surface postcrosslinking by mixing differingly surface-postcrosslinked superabsorbents, wherein different sieve fractions of a base polymer are separately admixed with a surface-postcrosslinking agent, subsequently surface-postcrosslinked by differing heat-treatment duration, and mixed, wherein the heat treatment utilizes a continuously conveying and heated dryer and the different base polymer sieve fractions endowed with surface postcrosslinking agent are fed in at various points of the dryer.