Epihalohydrin-based resins having a reduced halogen content
AssigneeAkzo Nobel N.V.
InventorsMarek Gorzynski, Andreas Pingel
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Abstract
The disclosed invention pertains to a process for the preparation of a water-soluble, nitrogen-containing, epihalohydrin-based resin having a reduced content of total halogen, organic halogen, adsorbable organic halogen (AOX)and by-products. The process involves treatment of nitrogen-containing, epihalohydrin-based resins or intermediate reaction-products with a basic ion-exchanger. The invention also pertains to novel resins displaying such halogen contents far below the values known in the art. Subject resins are useful as wet-strength agents for paper and are preferably of the polyaminoamide-epihalohydrin type.
Claims12
The process for the preparation of a water-soluble, nitrogen-containing, epihalohydrin-based resin comprising the step of subjecting the resin to an organic halogen reducing after-treatment, wherein the after-treatment comprises contacting the resin with a polymeric basic ion-exchanger.
A process for the preparation of a water-soluble, nitrogen-containing, epihalohydrin-based resin comprising a first stage in which a polyaminoamide is reacted with an epihalohydrin to form an intermediate which has not reached a stage of complete crosslinking and a second stage in which complete crosslinking occurs, wherein after the first stage the intermediate is contacted with a polymeric basic ion-exchanger.
Dependencies are inferred from the claim text.