An optical electronic device comprises: a casing having an external surface provided with an opening; a cable inserted through the opening; a bush attached to the cable; and a resin sealing portion. The bush is brought into close contact with the cable and the casing to seal a gap between the cable and the casing. The resin sealing portion is provided locally inside the casing to cover an internal surface of a portion of the casing surrounding the opening and a surface of a portion of the cable drawn from the opening into the casing.

An optical electronic device comprises: a casing having an external surface provided with an opening; a cable inserted through the opening; a bush attached to the cable; and a resin sealing portion. The bush is brought into close contact with the cable and the casing to seal a gap between the cable and the casing. The resin sealing portion is provided locally inside the casing to cover an internal surface of a portion of the casing surrounding the opening and a surface of a portion of the cable drawn from the opening into the casing.

Various embodiments of the teachings herein include a solid insulation material based on a resin containing epoxy groups for production of an anhydride-free insulation system by means of VPI. The material comprises: an anhydride-free curing catalyst; and an additive for improving distribution of the anhydride-free curing catalyst, wherein the additive comprises a phenyl carboxylate. The additive is present in an amount based on the epoxy groups in the resin containing epoxy groups which is present in the impregnating agent of at least 0.1% in stoichiometric terms.

Various embodiments of the teachings herein include a solid insulation material based on a resin containing epoxy groups for production of an anhydride-free insulation system by means of VPI. The material comprises: an anhydride-free curing catalyst; and an additive for improving distribution of the anhydride-free curing catalyst, wherein the additive comprises a phenyl carboxylate. The additive is present in an amount based on the epoxy groups in the resin containing epoxy groups which is present in the impregnating agent of at least 0.1% in stoichiometric terms.

Various embodiments of the teachings herein include a cationic tape accelerator for use in a process for producing an insulation system by impregnation and/or encapsulation with an anhydride-free impregnating agent. The tape accelerator comprises an ionogenic compound of a sulfonium-containing cation and a hexafluoroantimonate anion.

The present invention relates to a tape comprising an epoxy based resin having ester groups and ethylenically unsaturated groups, alternatively a hybrid resin. The tape of the invention can be used for insulation in electrical machines, especially in high voltage machines. Preferably, the tape of the invention is used in combination with a composition for impregnating and/or coating a substrate comprising the tape of the invention, wherein the composition further comprises a second epoxy based resin having ester groups and ethylenically unsaturated groups, also an hybrid resin, a diluent and an initiator for a radical polymerization.

The present invention relates to a tape comprising an epoxy based resin having ester groups and ethylenically unsaturated groups, alternatively a hybrid resin. The tape of the invention can be used for insulation in electrical machines, especially in high voltage machines. Preferably, the tape of the invention is used in combination with a composition for impregnating and/or coating a substrate comprising the tape of the invention, wherein the composition further comprises a second epoxy based resin having ester groups and ethylenically unsaturated groups, also an hybrid resin, a diluent and an initiator for a radical polymerization.

Various embodiments include an insulation material and/or impregnation resin for a wrapping tape insulation, comprising: a base resin curing to a thermoset; and a curing agent. The base resin comprises a siloxane-containing compound forming a —SiR.sub.2—O— backbone in the thermoset.

The invention relates generally to the field of insulating electrical conductors against partial discharge in the medium- and high-voltage ranges. In particular, the invention relates to an insulating system for an electric machine, in particular a rotating electric machine such as an electric motor and/or a generator. The invention provides for the first time a substitute for the conventionally used mica as a barrier material in an insulating system, such as the main insulation of rotating electric machines such as motors and/or generators. The substitute is based on a polyether-imide/siloxane copolymer, which can be processed two-dimensionally, for example by surface extrusion. In this way, sheets are produced and, after being processed in sheet form or as a laminate, can be used as planar insulating materials, or cut as strips, in insulating systems.

An electrical steel sheet used for a laminated core is an electrical steel sheet including an insulation coating 3 on a surface of a base steel sheet 2, the insulation coating being coated with a coating composition for an electrical steel sheet. The coating composition for an electrical steel sheet contains an epoxy resin, a first curing agent including an alkylphenol, and a second curing agent including either one or both of a phenol resol resin and a phenol novolac resin formulated in specific proportions.