IMPREGNATING COATING LAYER FOR INSULATING SHEETSAND MULTILAYER LAMINATES

The present invention relates to a multilayer laminate comprising at least three layers, wherein the two outer layers are each nonwoven backing sheet (7) containing a crystalline silicate mineral powder impregnated with a coating of an impregnating resin based on acrylate derivatives, which is suita...

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Bibliographische Detailangaben
Hauptverfasser:	Vercesi, Giorgio Patrizio, Gaussens, Benjamin, D'Arco, Luigi
Format:	Patent
Sprache:	eng
Schlagworte:	CONVERSION OR DISTRIBUTION OF ELECTRIC POWER DYNAMO-ELECTRIC MACHINES ELECTRICITY GENERATION IMPREGNATING OR COATING OF PAPER LAYERED PRODUCTS LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT ORNON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM PAPER NOT OTHERWISE PROVIDED FOR PAPER-MAKING PERFORMING OPERATIONS PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D PRODUCTION OF CELLULOSE PULP COMPOSITIONS TEXTILES TRANSPORTING TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G
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Beschreibung
Zusammenfassung:	The present invention relates to a multilayer laminate comprising at least three layers, wherein the two outer layers are each nonwoven backing sheet (7) containing a crystalline silicate mineral powder impregnated with a coating of an impregnating resin based on acrylate derivatives, which is suitable for increasing the compactness of the insulating sheet and for preventing the silicate mineral powder from detaching from the aramid fiber during use; the multilayer laminate having an inner layer being free of crystalline silicate mineral powder that comprises either i) heat resistant floc and binder, or ii) heat resistant polymeric film. The impregnating resin also comprises an organic solvent, which is capable of reducing the viscosity thereof and of promoting its deep penetration into the sheet. In addition, the impregnating resin comprises a UV polymerization photoinitiator which is suitable for curing the resin, only after said resin has been applied to the sheet and has penetrated deeply therein. The invention also describes the method for impregnating the insulating sheets.