Poly(viny1 alcohol) (PVA) films were allowed to react with formaldehyde in water containing salt and an acid catalyst (the heterogeneous formalization). The content of crosslinks increased with decreasing acid concentration under fixed formaldehyde and salt concentrations. The crosslink contents of formalized PVA were estimated in terms of the degree of swelling of formalized and acetylated PVA in chloroform. The crosslink contents were calculated by means of FLORY'S method. One crosslink per 100 units of vinyl alcohol was estimated to exist for the sample of the degree of swelling about 6. ZUSAMMENFASSUNG :Die heterogene Reaktion von Polyvinylalkohol(PVA)-Filmen mit Formaldehyd wurde in Salz und Siiurekatalysator enthaltendem Wasser untersucht. Bei konstanter Formaldehyd-und Salzkonzentration steigt der Vernetzungsgrad mit abnehmender Siiurekonzentration. Der Vernetzungsgrad wurde mittels Quellungsmessungen an formalisiertem und dann acetyliertem PVA in Chloroform bestimmt. Der Vernetzungsgrad wurde nach der FLoRYschen Methode berechnet. Eine Probe mit dem Quellungsgrad von etwa 6 besitzt eine Vernetzung pro 100 Grundbausteine.
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