| 摘要 |
The present invention relates to an anti-stick processing aid for use in a process for producing water-absorbing polymers, comprising the steps of:
i) mixing (α1) 0.1 to 99.999% by weight of polymerizable, ethylenically unsaturated monomers containing acid groups, or salts thereof, (α2) 0 to 70% by weight of polymerizable, ethylenically unsaturated monomers copolymerizable with (αl), (α3) 0.001 to 10% by weight of one or more crosslinkers, (α4) 0 to 30% by weight of water-soluble polymers, (α5) 0-80% by weight of water, and (α6) 0 to 20% by weight, of one or more assistants, where the sum of the weights of (α1) to (α5) is 100% by weight, (ii) free-radical polymerization with crosslinking to form a water-insoluble, aqueous untreated hydrogel polymer, (iii) drying the hydrogel polymer, (iv) grinding and sieving the hydrogel polymer to size, (v) surface postcrosslinking the ground and sieved hydrogel polymer and (vi) drying and finishing the water-absorbing polymer,wherein the anti-stick processing aid is used alone or in mixtures before and/or in steps (iii). |
