Abstract:
The invention relates to a method for producing water-absorbing polymer particles by suspension polymerization and thermal surface post-curing. The base polymer obtained by suspension polymerization has a centrifuge retention capacity of at least 37 g/g and the thermal surface post-curing is carried out at between 100 -190°C.
Abstract:
The invention relates to a method for producing water-absorbing polymer particles by suspension polymerization and thermal surface post-curing. The base polymer obtained by suspension polymerization has a centrifuge retention capacity of at least 37 g/g and the thermal surface post-curing is carried out at between 100 -190°C.
Abstract:
The present invention relates to a process for producing polymer composites suitable for absorbing and storing aqueous liquids and to the polymer composites obtainable by this process. The invention further relates to the use of these polymer composites. The process comprises free-radical polymerization of a monomer composition M which a) 50 to 100% by weight, based on the total amount of monomers A and B, of at least one monomer A having one ethylenic double bond and at least one neutralizable acid group, b) 0 to 50% by weight of optionally one or more comonomers B which are different than the monomers A and have one ethylenic double bond, and c) 0 to 10% by weight, based on the total amount of monomers A and B, of at least one crosslinker C, wherein the polymerization of the monomer composition is performed in an aqueous suspension of a water-insoluble particulate substance S comprising cellulose or lignocellulose, the weight ratio of the monomer composition M to the substance S being in the range from 9:1 to 1:9; and wherein the monomers A used for polymerization are present in the aqueous suspension in neutralized, i.e. anionic, form to an extent of at least 10 mol%, frequently to an extent of at least 20 mol%, particularly to an extent of at least 30 mol% and especially to an extent of at least 35 mol%.
Abstract:
A process for producing water-absorbing polymer particles by suspension polymerization and thermal surface postcrosslinking, wherein the agglomerated base polymer obtained by suspension polymerization has a centrifuge retention capacity of at least 37 g/g and the thermal surface postcrosslinking is conducted at 140 to 220° C.
Abstract:
A process for agglomerating superabsorbent particles, wherein polymer particles having a particle size of 250 μm or less are dispersed in a hydrophobic organic solvent, the dispersed polymer particles are mixed with an aqueous monomer solution, the amount of unneutralized monomer applied with the monomer solution being from 0.5% to 80% by weight, based on the dispersed polymer particles, and the monomer solution is polymerized.
Abstract:
A mixture or kit-of-parts comprising a superabsorbent polymer (hereinafter referred to as "SAP" or "SAPs") and a biopesticide, their application in agriculture, or the method for conducting the combined application of SAP and biopesticide in agriculture.
Abstract:
A process for agglomerating superabsorbent particles, wherein polymer particles having a particle size of 250 μm or less are dispersed in a hydrophobic organic solvent, the dispersed polymer particles are mixed with an aqueous monomer solution, the total amount of water applied to the dispersed polymer particles being at least 100% by weight, based on the dispersed polymer particles, and the monomer solution is polymerized.
Abstract:
A process for producing water-absorbing polymer particles by suspension polymerization, wherein the polymerization is conducted in the presence of dissolved oxygen.