Swellable polymer blends, method for the preparation of such polymer blends and also products prepared on the basis of such polymer blends.

摘要

Swellable polymer blends suitable for the controlled release of for instance pesticides and comprising one or more polymers having anhydride groups as component (a) like polystyrene maleic anhydride and one or more polymers having groups which can interact with hydrogen atoms as component (b), in which blend the components (a) and (b) are linked to each other as a result of complete or partial hydrolysis of component (a) via hydrogen bonds. For instance ecologically acceptable swellable polymer blends are obtained if chemically modified lignin is used partly or completely as component (b). On the other hand swellable polymer blends having an increased flexibility are obtained if component (b) is at least partly based on polyethene vinyl acetate whereas in blends having an improved elongation at rupture and tensile strength component (b) is partially or completely based on a polyvinyl acetate/vinyllaurate copolymer or polylactic acid.