Abstract: The invention relates to a delivery device suitable for delivering a chemical substance, e.g. a medical device such as a catheter, a microcapsule, an implantable capsule or a P-ring, or a delivery device for use in the construction industries e.g. in the form of microcapsules comprising antifouling agent for marine paint. The delivery device comprises a closed cavity, the cavity is defined by an innermost wall surface, wherein at least a section of the inner wall surface constitutes an inner surface of a delivery membrane wherein the delivery membrane comprises an interpenetrating polymer network substrate comprising a host polymer and a guest polymer, where the guest polymer is interpenetrating the host polymer to form substantially continuous pathways within said host polymer.

Abstract: A method of producing a delivery device for delivering a chemical compound includes i) providing an interpenetrating polymer substrate (IP substrate) having a first continuous polymer comprising rubber and a second polymer having hydrogel or a hydrogelable precursor, where the second polymer is interpenetrating in the first polymer; ii) providing the chemical compound and a loading solvent for the chemical compound; and iii) loading the IP substrate with the chemical compound by subjecting the IP substrate to the loading solvent having the chemical compound under conditions where the loading solvent at least partially swells the second polymer. The chemical compound, the second polymer and the loading solvent are selected such that the work of adhesion (Whc) between the second polymer and the chemical compound during at least a part of the loading is at least about 0 J/m2.

Abstract: The invention relates to a method of producing an article comprising an interpenetrating polymer network (IPN) and an IPN comprising article e.g. obtainable by this method. The method comprises providing a polymer substrate e.g. shaped to provide the desired article and applying it in a reaction chamber, providing at least one monomer for an interpenetrating polymer, exposing said polymer substrate in said reaction chamber to said at least one monomer in the presence of an impregnation solvent comprising CO2 under conditions wherein said CO2 is in its liquid or supercritical state and polymerizing and optionally cross linking said at least one monomer to form an interpenetrating polymer in the presence of a polymerization solvent under conditions wherein at least a part of said at least one monomer is dissolved in said polymerization solvent.