Abstract: The present invention relates to a curable two-part resin system having a resin part containing at least one cycloaliphatic epoxy resin and a hardener part containing (i) at least one alicyclic anhydride, and (ii) a block-copolymer having polysiloxane blocks and organic blocks, and containing greater than 60 wt % of an inorganic filler.

Abstract: A composition comprising (a) a cationically polymerisable epoxy resin, (b) an initiator for the cationic polymerisation, (c) a microparticle filler, and (d) a nanoparticle filler can be used for the production of thermally stable insulating material for electrical and electronic components.

Abstract: The disclosure relates to a curable mixture for use in impregnation of paper bushings comprising a resin mixture of a bisphenol-A-diglycidylether (BADGE) and a bisphenol-F-diglycidylether (BFDGE), methyltetrahydrophthalic anhydride (MTHPA) as hardener, and an accelerator selected from the group consisting of tertiary alkylamine aminoethylalcohols and corresponding ethers thereof as well as paper bushings impregnated with such mixture and uses of such mixture.

Abstract: A multiple component anhydride-free, thermosetting epoxy resin composition comprising, (A) at least one epoxy resin, and (B) at least one curing agent selected from the group of (b1) a polyetheramine of the formula (1) (Formula (1)), wherein x is a number of from 2 to 8, and (b2) a polyetheramine with at least one terminal end group of the formula (2) (Formula (2)), and (C) at least one epoxy silane, is, in particular, suitable for the manufacture of instrument transformers and dry-type transformers by casting, potting and encapsulation processes, wherein said articles exhibit good mechanical, electrical and dielectrical properties.

Abstract: A composition comprising (a) a cationically polymerisable epoxy resin, (b) an initiator for the cationic polymerisation, (c) a microparticle filler, and (d) a nanoparticle filler can be used for the production of thermally stable insulating material for electrical and electronic components.

Abstract: The disclosure relates to a curable two-component resin-based system, comprising (a) a resin component, comprising (i) at least one epoxy resin, (ii) a block-copolymer comprising silicone and organic blocks, (iii) a silane, and (iv) a filler comprising aluminium oxide and wollastonite, and (b) a hardener component, comprising at least one polyoxyalkylene polyamine, wherein the curable system contains in total >60 wt % filler with a ratio of wollastonite to aluminium oxide of 50 to 75 wt % wollastonite and 25 to 50 wt % aluminium oxide, and wherein the hardener component (b) does not comprise any anhydride, as well as cured articles obtainable by curing the curable system and uses thereof.

Abstract: A curable composition comprising a mixture of homopolymers of an aliphatic polyisocyanate and a cycloaliphatic polyisocyanate, a polyester polyol or polyether polyol and a filler. The composition is particularly suitable for use in the manufacture of outdoor insulation system articles.

Abstract: Resin-rich mica tapes comprising one or more than one layer of mica paper and one or more than one layer of a nonmetallic inorganic fabric, in particular a glass fabric, which are pre-impregnated with an impregnation resin composition comprising an epoxy resin with more than one epoxy group, which is solid or semisolid at ambient temperature, a latent curing agent for said epoxy resin, about 5 to about 20% by weight of hexagonal boron nitride of a particle size (D50) of equal or less than about 3 ?m, about 0.05 to about 1% by weight of a wetting agent and a suitable solvent which is removed after pre-impregnation of the mica tape with the impregnation resin mixture are useful to prepare electrical insulations with excellent thermal conductivity and dielectric dissipation factor.

Abstract: The disclosure relates to a curable mixture, in particular for use in impregnation of paper bushings, comprising (a) a resin composition comprising a bisphenol-A-diglycidylether; a polyglycidylether different from BADGE and/or a cycloaliphatic epoxy resin; a N-glycidyl component; a nano-size or dissolvable toughener; and a silane component, and b) a hardener composition comprising methyltetrahydrophthalic anhydride (MTHPA) and at least one curing accelerator as well as paper bushings impregnated with such mixture and uses of such mixture.

Abstract: The disclosure relates to a curable mixture for use in impregnation of paper bushings comprising a resin mixture of a bisphenol-A-diglycidylether (BADGE) and a bisphenol-F-diglycidylether (BFDGE), methyltetrahydrophthalic anhydride (MTHPA) as hardener, and an accelerator selected from the group consisting of tertiary alkylamine aminoethylalcohols and corresponding ethers thereof as well as paper bushings impregnated with such mixture and uses of such mixture.

Abstract: Disclosed are a storage stable resin composition, comprising an epoxy resin, a block-copolymer with silicone and organic blocks, and a silane, a process for obtaining such storage stable resin composition, a curable resin composition obtainable from the above storage stable resin composition as well as a cured article obtainable from the latter and uses thereof.

Abstract: The invention relates to a curing agent for thermosetting epoxy resins comprising (a) at least one aromatic amine containing at least two amino groups, and (b) at least one clathrate compound obtained by reacting a tetrakisphenol of the formula (1), or a 9,9-Bis(4-hydroxyphenyl)fluorene of formula (2), as the host molecule, and an imidazole or an imidazolium derivative as the guest molecule, wherein the substituents are as defined in the description, and n is the number 0, 1, 2 or 3, which can advantageously be used for the curing of epoxy resins. In addition, the invention also relates to a process for the preparation of a cured article, a process for the preparation of insulation systems for electrical engineering and a cured article obtained by the processes.

Abstract: A multiple component thermosetting epoxy resin composition comprising (A) at least one cycloaliphatic glycidyl-type epoxy resin without an ester group, (B) at least one curing agent selected from the group aliphatic amine, cycloaliphatic amine, and dicyandiamide, and (C) at least one silanized filler, which, in particular, is suitable for the manufacture of outdoor insulation system articles for electrical engineering by casting, potting, encapsulation, and impregnation processes, wherein said articles exhibit good mechanical, electrical and dielectrical properties, and can be used as insulators, bushings, switchgears and instrument transformers.

Abstract: Disclosed is an anhydride-free insulation system for insulating an electrical conductor or a coil of conductors, comprising: (a) a liquid epoxy resin formulation comprising at least 80% by weight, based on the liquid epoxy resin bath formulation, of bisphenol A diglycidyl ether, (b) a mica tape comprising a mica paper adhered by means of a binder to a support (c) an imidazole compound of the formula (I) wherein R1, R2 and R3 are individually selected from hydrogen, branched or unbranched C1-C4-alkyl, phenyl and benzyl, provided that at least one of R1 and R2 is hydrogen.

Abstract: A multiple component anhydride-free, thermosetting epoxy resin composition comprising, (A) at least one epoxy resin, and (B) at least one curing agent selected from the group of (b1) a polyetheramine of the formula (1) (Formula (1)), wherein x is a number of from 2 to 8, and (b2) a polyetheramine with at least one terminal end group of the formula (2) (Formula (2)), and (C) at least one epoxy silane, is, in particular, suitable for the manufacture of instrument transformers and dry-type transformers by casting, potting and encapsulation processes, wherein said articles exhibit good mechanical, electrical and dielectrical properties.

Abstract: Disclosed is an anhydride-free insulation system for current-carrying construction parts of an electric engine which comprises: (A) a mica paper or mica tape for wrapping parts of said electric engine that are potentially current-carrying during operation of the engine, which mica paper or mica tape is impregnable via vacuum pressure impregnation with a thermally curable epoxy resin formulation and comprises a complex of boron trihalogenide with an amine of the formula BX3·NR1R2R3 or R1R2N—A—NR1R2, wherein X denotes halogen, R1, R2 and R3 are each independently of the others hydrogen, C1-C12alkyl, C5-C30aryl, C6-C36aralkyl or C6-C14cycloalkyl, which can be unsubstituted or substituted by one or more C1-C12alkyl groups, A is a bivalent aliphatic aromatic or cycloaliphatic radical; (B) a thermally curable bath formulation for the vacuum pressure impregnation comprising bisphenol A diglycidyl ether and optionally bisphenol F diglycidyl ether, which formulation is substantially or, preferably, entirel

Abstract: Disclosed is an anhydride-free insulation system for current-carrying construction parts of an electric engine which comprises: (A) a mica paper or mica tape for wrapping parts of said electric engine that are potentially current-carrying during operation of the engine, which mica paper or mica tape is impregnable via vacuum pressure impregnation with a thermally curable epoxy resin formulation and comprises one or more thermally activatable sulfonium salt initiators for the homopolymerisation of the epoxy resins present in said said thermally curable epoxy resin formulation or a mixture thereof in an amount sufficient to homopolymerize the epoxy resin taken up by the mica paper or mica tape and the construction part of the engine during the vacuum pressure impregnation step; (B) a thermally curable bath formulation for the vacuum pressure impregnation comprising (i) a polyglycidyl ether or a mixture thereof, and (ii) a cycloaliphatic epoxy resin comprising at least two epoxy groups, which are fused to a cy

Abstract: Disclosed is an anhydride-free insulation system for current-carrying construction parts of an electric engine which comprises: (A) a mica paper or mica tape for wrapping parts of said electric engine that are potentially current-carrying during operation of the engine, which mica paper or mica tape is impregnable via vacuum pressure impregnation with a thermally curable epoxy resin formulation and comprises a thermally activatable curing initiator for the epoxy resin formulation consisting of one or more quarternary ammonium salts of an aromatic-heterocyclic compound, which contains 1 or 2 nitrogen atoms, and a complex anion selected from the group consisting of BF4?, PF6?, SbF6?, SbF5(OH)?, AsF6? and Al[OC(CF3)3]4? in an amount sufficient to cure the epoxy resin taken up by the mica paper or mica tape and the construction part of the engine during the vacuum pressure impregnation step; (B) a thermally curable bath formulation for the vacuum pressure impregnation comprising one or more epoxy resins, which fo

Abstract: A process for the preparation of insulation systems for electrical engineering by automatic pressure gelation (APG) or vacuum casting, wherein a multiple component thermosetting resin composition is used, said resin composition comprising (A) at least one epoxy resin, (B) at least one carboxylic acid anhydride curing agent, and (C) 2,4,6-tris(dimethylaminomethyl)phenol, provides encased articles exhibiting good mechanical, electrical and dielectrical properties, which can be used as, for example, insulators, bushings, switchgears and instrument transformers.

Abstract: A thermosetting epoxy resin composition comprising (A) a glycidyl-type epoxy resin comprising a mixture of (a1) from 10 wt % to 90 wt % of at least one cycloaliphatic glycidyl-type epoxy resin without an ester group, and (a2) from 90 wt % to 10 wt % of at least one cycloaliphatic glycidyl-type epoxy resin containing an ester group, each based on the total weight of (a1) and (a2), (B) at least one cationic curing agent, and optionally (C) at least one silanized filler, which, in particular, is suitable for the manufacture of outdoor insulation system articles for electrical engineering by casting, potting, encapsulation, and impregnation processes, wherein said articles exhibit good mechanical, electrical and dielectrical properties, and can be used as insulators, bushings, switchgears and instrument transformers.