Abstract:
The present invention relates to a process for producing water-absorbing polymeric particles by polymerizing a monomer solution comprising at least one ethylenically unsaturated acid-functional monomer less than 55 mol % neutralized and drying the resulting polymeric gel by means of a heated gas stream in at least two temperature zones.
Abstract:
A process for classifying water-absorbing polymer beads, wherein screens having different mesh sizes are used before and after the postcrosslinking to remove the oversize.
Abstract:
The present invention relates to fluid-absorbent articles, comprising an upper liquid-pervious layer, a lower liquid-impervious layer and a fluid-absorbent core, wherein the fluid-absorbent core comprises a fibrous material and 10 to 95% by weight of spherical fluid-absorbent polymer particles having a moisture content of at least 8% by weight.
Abstract:
The present invention relates to fluid-absorbent articles, comprising an upper liquid-pervious layer, a lower liquid-impervious layer, a fluid-absorbent core, wherein the fluid-absorbent core comprises a fibrous material and 10 to 95% by weight of spherical fluid-absorbent polymer particles, and an acquisition distribution layer, wherein the acquisition distribution layer comprises a fibrous material and 0 to 20% by weight of spherical fluid-absorbent polymer particles.
Abstract:
A process for producing water-absorbing polymer particles, comprising classification by means of a tumbler screening machine, wherein the tumbler screening machine used for classification is equipped with at least one ball knock cleaning system and entrained balls are removed outside the tumbler screening machine by means of a capture device.
Abstract:
A process for pneumatic delivery of water-absorbing polymer particles, the compressor used for pneumatic delivery having a steep characteristic and the initial gas rate in the delivery corresponding to a Froude number of from 10 to 18.
Abstract:
The present invention relates to a method for producing water-absorbing polymer particles by radiation-inducing polymerization on a continuously revolving belt, electromagnetic radiation having a wavelength of greater than 400 nm being shielded.
Abstract:
A process for producing water-absorbing polymer particles, wherein an aqueous polymer gel is dried in a forced-air belt drier on a circulating conveyor belt and the surface of the conveyor belt has a multitude of elevations or depressions which are suitable for restricting the mobility of the aqueous polymer gel in transverse direction.
Abstract:
A process for removing metallic impurities from a product mass flow comprising water-absorbing polymer particles, wherein the product mass flow has a temperature of 35 to 90° C.
Abstract:
A process for continuously producing water-absorbing polymer particles, in a continuous polymerization reactor, wherein the amount of initiator used and/or the intensity of the UV radiation optionally used to initiate the polymerization is reduced after the startup of the polymerization reactor.