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US 12,492,281 B2Granted
Polyisocyanurate materials as electrical potting compounds
AssigneeCovestro Deutschland AG
InventorsMathias Matner, Michael Ehlers, Dirk Achten, Ralf Rott, Bengt Arheden
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Abstract
The invention relates to potting compounds which cure to polyisocyanurate plastics, to the production of said potting compounds and to the use of the potting compounds for manufacturing electrical components.
Claims11
A process for producing an electrical component comprising
- a) providing a casting resin;
- b) potting a not yet embedded electrical component with the casting resin provided in process step a);
- c) catalytically trimerizing isocyanate groups of the casting resin,
- the casting resin having a molar ratio of isocyanate groups to isocyanate-reactive groups of at least 3:1 and a solvent content of not more than 10% by weight, wherein the casting resin comprises
- (i) at least one monomeric or oligomeric polyisocyanate A having an isocyanate content of at least 15% by weight;
- (ii) at least one inorganic filler B containing silicon oxide units having an oil number of not more than 25 g/100 g determined according to DIN EN ISO 787-5 (October 1995) and a Mohs hardness of at least 6;
- and
- iii) at least one trimerization catalyst C,
- wherein the casting resin has a viscosity of up to 102 Pas after 1 hour at 60° C.
6 more elements
A casting resin having a molar ratio of isocyanate groups to isocyanate-reactive groups of at least 3:1 and a solvent content of not more than 10% by weight, wherein the casting resin comprises
- (i) at least one monomeric or oligomeric polyisocyanate A having an isocyanate content of at least 15% by weight;
- (ii) at least one inorganic filler B containing silicon oxide units having an oil number of not more than 25 g/100 g determined according to DIN EN ISO 787-5 (October 1995) and a Mohs hardness of at least 6;
- and
- (iii) at least one trimerization catalyst C,
- wherein the casting resin has a viscosity of up to 102 Pas after 1 hour at 60° C.
2 more elements
Dependencies are inferred from the claim text.