Patent DE-102011003620-A1 (DE)
Title: Multilayer film useful for preventing fouling on surfaces by fouling organisms, comprises three layers respectively exhibiting different electrical conductivities
Inventor: NOWAK STEPHAN
IPC: B32B9/00
Filed: 2011-02-03
Abstract: Multilayer film comprises at least three layers. A first layer (1) comprises a polymeric material exhibiting an electrical conductivity of 0.1-10 S in the normal direction to the first layer, a second layer (2) exhibits an electrical conductivity between two points in the plane of the second layer, which are mutually spaced apart at a distance of 0.5x 5 cm. The electrical conductivity of the second layer exhibits at least two orders of magnitude greater than the first layer. A third layer (3) exhibits an electrical conductivity in the normal direction of the third layer. Multilayer film comprises at least three layers. A first layer (1) comprises a polymeric material exhibiting an electrical conductivity of 0.1-10 S in the normal direction to the first layer, a second layer (2) exhibits an electrical conductivity between two points in the plane of the second layer, which are mutually spaced apart at a distance of 0.5x 5 cm. The electrical conductivity of the second layer exhibits at least two orders of magnitude greater than the first layer, when examined in an analogous manner with respect to the electrical conductivity in its plane. A third layer (3) exhibits an electrical conductivity in the normal direction of the third layer, and the electrical conductivity of the third layer is at least six orders of magnitude less than the first layer measured in normal direction. Independent claims are also included for: (1) producing the film, comprising either (a) applying the first or the third layer initially as a film of a mixture comprising prepolymers of the layer to a surface of a material or mixture of materials comprising fluorinated and/or chlorinated hydrocarbons, silicones, silanes, and siliconized or silanized films, (b) drying the mixture on the coated surface to form a surface coating, and (c) optionally separating the formed surface coating from the surface as thin film, or extruding or calendering the first or third layer from the melt or the solution of the polymer as thin film, where the polymer mixture is applied to a polished steel surface, and the formed surface coating is separated as thin film, and at least the first and optionally the third layer are made of polymer, and further (i) applying a further thin film as the second layer on the surface coating or thin film of the first and the third layer, or printing the second layer and (ii) applying the thin film obtained in the steps (a)-(c) on the two-layer composite obtained in the step (i), or applying a further thin film extruded from the melt or the solution of the polymer as the third layer or applying the two-layer composite obtained in the steps (a)-(b) on the surface coating obtained in the step (i); and (2) preventing the fouling by fouling organisms on the surface immersed in water, comprising plastering the surface with at least two spatially separate sections of the multilayer film and applying an electric voltage on the sections of the multilayer film.