New sealing compounds and use of same in producing electricity insulating materials

Sealing composition of two components based on polyurethane comprises: (a) a first component comprising polyester alcohols; and (b) a second component of at least one di- and/or polyisocyanate and/or a prepolymer based on at least one isocyanate. The component (a) comprises: a homogeneous composition of at least one aromatic polyester alcohol, at least one diol, optionally at least one additional dicarboxylic acid and optionally at least one triol; at least one natural oil; optionally an additive including e.g. a solid flame retardant; and optionally an organic tin catalyst. Sealing composition of two components based on polyurethane comprises: (a) a first component comprising polyester alcohols; and (b) a second component of at least one di- and/or polyisocyanate and/or a prepolymer based on at least one isocyanate. The first component comprises: (i) a homogeneous composition of at least one aromatic polyester alcohol, at least one diol, optionally at least one additional dicarboxylic acid and optionally at least one triol with a hydroxyl-value of 220-360 mg of potassium hydroxide/g; (ii) at least one natural oil, which is optionally modified chemically via oxidation, epoxidation, sulfonation or splitting; (iii) optionally an additive including a solid flame retardant, a pigment and/or a solid filler; and (iv) optionally an organic tin catalyst. Independent claims are also included for: (1) a homogeneous composition of the polyester alcohol and the natural oil comprising (in wt.%) at least one aromatic polyester alcohol based on terephthalic acid, at least one diol, optionally a dicarboxylic acid and optionally a triol with a hydroxyl-value of 220-360 mg of potassium hydroxide/g (45-95), and the natural oil (55-5), which is optionally modified chemically, and exhibits a viscosity of 500-3000 mPas at 25[deg] C; and (2) preparing the sealing composition, comprises reacting the components (a) and (b) at an isocyanate index of 70-160, preferably 80-130 under mixing and molding. Die Erfindung betrifft neue Vergussmassen auf der Basis von Polyurethanen aus zwei Reaktionskomponenten und daraus hergestellte Elektroisolierstoffe mit verbesserten Isolationseigenschaften gegenüber herkömmlichen Produkten. Insbesondere betrifft diese Erfindung Zwei-Komponenten-Systeme, die miteinander vermischt reagieren und als Reaktionsprodukt Elektroisolierstoffe mit hoher Durchschlagspannung insbesondere für Kabelverbindungen, Kabeldurchführungen und Endverschlüsse von Kabeln erg