Pulverulent polymers crosslinked on the surface
AssigneeStockhausen GmbH & Co. KG
InventorsWaldemar Inger, Rudiger Hose, Heinz-Peter Bohlmann
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Abstract
The present invention relates to a pulverulent polymer post-crosslinked on the surface and absorbing water or aqueous liquids, synthesised from polymerised, optionally pre-crosslinked monomers containing partially neutralised carboxyl groups. The present invention also relates to a process for the post-treatment of the aforementioned polymers and the use of a solution of at least one salt of an at least trivalent cation for restoring the gel permeability of the aforementioned polymers that have been damaged by mechanical action.
Claims26
A pulverulent polymer suitable for absorbing water or aqueous liquids and post-crosslinked on the surface, the pulverulent polymer is synthesised from polymerised, optionally pre-crosslinked, partially neutralised monomers containing carboxyl groups, wherein the pulverulent polymer has been reacted, after the post-crosslinking with the solution of at least one salt of an at least trivalent cation.
Use of a solution of at least one salt of at least trivalent cation for restoring the gel permeability of pulverulent polymers absorbing water or aqueous liquids that have been damaged by mechanical action, said polymers being synthesised from polymerised, optionally pre-crosslinked monomers containing partially neutralised carboxyl groups, characterised in that the solution of the salt is added to the pulverulent polymer after the post-crosslinking and the said pulverulent polymer and the solution are thoroughly mixed.
Dependencies are inferred from the claim text.