Patent EP-2645375-A1 (EP)
Inventor: BOESE HOLGER
IPC: H01L41/04
Filed: 2013-03-06
Abstract: Dielectric elastomer comprises a film comprising a fluorinated silicone elastomer exhibiting a modulus of elasticity of not > 450 kPa, and a coating made of a stretchable electrode material, present on both the sides of the film. Independent claims are also included for: (1) a multilayered system comprising the above dielectric elastomer, where at least one double layer, which comprises a further layer made of a fluorinated silicone elastomer having a modulus of elasticity of not > 450 kPa, and a further coating made of a stretchable electrode material, is applied on one of the coatings made of the stretchable electrode material, such that two coatings made of the stretchable electrode material, are separated from each other by the layer of the fluorinated silicone elastomer, and vice versa, where the coatings made of the stretchable electrode material are connected alternately as a positive and as a negative electrode; and (2) producing the dielectric elastomer, comprising (a) providing an at least partially fluorinated polysiloxane, which carries at least two reactive groups, (b) providing an at least partially fluorinated silane or polysiloxane that carries at least three groups, which react with a reactive group of the partially fluorinated polysiloxane provided in the step (a), where the polysiloxane provided in the step (a) or the silane or the polysiloxane provided in the step (b) exhibits a molecular weight of at least 10000 g/mole, (c) mixing the polysiloxane provided in the step (a), the silane or the polysiloxane provided in the step (b), a silicone oil and optionally a catalyst, (d) carrying out layered application of the mixture obtained in the step (c) on a substrate, (e) reacting the reactive groups in the mixture using light and/or heat and/or by adding a catalyst to form a stable film, (f) removing the film from the substrate, (g) producing at least one mixture comprising the materials obtained in the step (c) and an electrically conductive powder, (h) applying the mixture obtained in the step (g) on a side of the film, and applying either the same mixture or a different mixture produced in the step (g) on the other face of the film, and (i) reacting the reactive groups in the mixture using light and/or heat and/or by adding a catalyst, or step (a), step (b), (c1) providing an at least partially fluorinated silane or polysiloxane that carries not > two groups, which react with a reactive group of the partially fluorinated polysiloxane provided in the step (a), where the polysiloxane provided in the steps (a), (b) or (c1) exhibits a molecular weight of at least 10000 g/mole, (d1) mixing the polysiloxane provided in the step (a), the silane or the polysiloxane provided in the step (b), the silane or the polysiloxane provided in the step (c1), and optionally a catalyst, (e1) carrying out layered application of the mixture obtained in step (d1) on a substrate, (f1) reacting the reactive groups in the mixture using light and/or heat and/or by adding a catalyst to form a stable film, (g1) removing the film from the substrate, (h1) producing at least one mixture comprising the materials obtained in the step (d1) and an electrically conductive powder, (i1) applying the mixture obtained in the step (h1) on a side of the film, and applying either the same mixture or a different mixture produced in the step (h1) on the other face of the film, and (k1) reacting the reactive groups in the mixture using light and/or heat and/or by adding a catalyst.