Method for Producing Water-Absorbent Polymer Foams
AssigneeBASF SE
InventorsFrancisco Javier Lopez Villanueva, Markus Linsenbühler, Matthias Weismantel, Bernd Siegel, Timo Baumgaertner, Michael Fastner
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Abstract
A process for preparing water-absorbing polymeric foams by polymerization of a foamed aqueous monomer solution or suspension, comprising an ethylenically unsaturated monomer which bears acid groups and may be at least partly neutralized, a crosslinker, a photoinitiator and a surfactant.
Claims16
A process for producing water-absorbing polymeric foams by polymerizing a foamed aqueous monomer solution or suspension comprising
- a) at least one ethylenically unsaturated monomer which bears an acid group and may be at least partly neutralized,
- b) at least one crosslinker,
- c) at least one photoinitiator, and
- d) at least one surfactant,
- the monomer solution or suspension being polymerized to a polymeric foam, wherein the at least one photoinitiator is a compound of the general formula I
- in which
- R1, R2, R3, R4, and R5 are each independently hydrogen or C1-C8-alkyl, where C3-C8-alkyl may be branched or unbranched,
- X is hydrogen, OR6, or C1-C8-alkyl, where C3-C8-alkyl may be branched or unbranched,
- R6 is C1-C8-alkyl or C1-C8-hydroxyalkyl, where C3-C8-alkyl or C3-C8-hydroxyalkyl may be branched or unbranched,
- Y is C4-C8-cycloalkyl, C(R7)R8, P(═O)R7
- R7 and R8 are each independently C1-C8-alkyl or C6-C12-aryl, where C3-C8-alkyl or C9-C12-aryl may be branched or unbranched.
A water-absorbing polymeric foam prepared by the process of 1.
A water-absorbing polymeric foam which has a centrifuge retention capacity of at least 5 g/g and a residual monomer content of less than 0.15% by weight.
Dependencies are inferred from the claim text.