Abstract: The invention relates to a method for deposition of a catalyst, in particular a method for coating a membrane electrode unit (MEA) for a fuel cell. Said method requires no external electrical field as usual for conventional galvanic techniques. The support for the catalytic layer is first capacitively charged (pseudocapacitance). When brought into contact with an electrolyte solution, comprising the catalyst in the form of dissolved metal salt ions, an in-situ reduction (deposition) of the metal salt ions to give metallic catalyst occurs at the site of contact.

Abstract: A curable epoxy resin composition comprising (a) a cycloaliphatic epoxy resin that is liquid at RT and, suspended therein, a core/shell polymer, (b) a polycarboxylic anhydride and (c) fillers, wherein the composition is flame-retardant because two different fillers (c1) and (c2) are present, the nature of filler (c1) being such that, starting at RT, it is able to release water as the temperature rises, the total proportion of fillers (c1) and (c2) is from 58 to 73% by weight, based on the total amount of components (a), (b), (c1) and (c2), and the ratio by weight of the fillers (c1):(c2) is from 1:3 to 1:1, is suitable as a casting resin, especially in the impregnation of electrical coils and in the production of electrical components, such as air-cooled transformers, bushings, insulators, switches, sensors, converters and cable end seals.

Abstract: A curable epoxy resin formulation comprising a) 40 to 100% by weight of an epoxy group-terminated polyester of a dimerised or trimerised fatty acid and a polyhydric alcohol, and 0 to 60% by weight of a diepoxide which is not an epoxy group-terminated polyester, b) a hardener for epoxy resins consisting of 50 to 99% by weight of a polyoxyalkylene di- or triamine and 1 to 50% by weight of a hardener which is not a polyoxyalkyleneamine, and comprising as further optional components c) a curing accelerator, and d) customary modifiers for epoxy casting resins, with the proviso that the sum of the constituents in component a) as well as in component b) is in each case 100% by weight, is suitable for use as casting resin formulation for encapsulating electrical or electronic components.

Abstract: Cycloaliphatic epoxy compounds represented by general formula (I): ##STR1## wherein R.sup.1 and R.sup.2 are hydrogen atoms, or R.sup.1 and R.sup.2 taken together represent an epoxy group, R.sup.3 and R.sup.4 are the same or different and each represents a hydrogen atom or a methyl group, and Q is a linear or branched alkanediyl group with 2 to 16 carbon atoms and with the proviso that the adjacent nitrogen and oxygen atoms are not attached to the same carbon atom. The cycloaliphatic epoxy compounds can be used to produce cured epoxy resin compositions exhibiting superior mechanical properties, e.g., tensile and flexural strength and toughness.

Abstract: A composition, which comprises (a) a cycloaliphatic epoxy resin,(b) an OH-terminated polysiloxane,(c) a polysiloxane/polyether copolymer, and(d) a cyclic polysiloxane,has excellent hydrophobic properties and can be used as electric insulation composition.

Abstract: A curable epoxy resin mixture consisting ofa) 90 to 100% by weight of an aromatic glycidyl ether compound containing more than one glycidyl ether group in the molecule and 0 to 10% by weight of an epoxy resin other than aromatic polyglycidyl ethers, the sum of the epoxy resins being 100% by weight,b) 60 to 100% by weight of a polyoxyalkylenediamine or polyoxyalkylenetriamine and 0 to 40% by weight of a curing agent other than polyoxyalkyleneamines, the sum of the curing agents being 100% by weight,c) wollastonite or an inorganic filler containing more than 50% by weight of wollastonite, based on the total amount of the inorganic filler and, optionally,d) a curing accelerator, ande) glass fibres or customary additives for casting resins based on epoxy resins, is particularly suitable as casting resin composition for encapsulating, or casting in of, electrical or electronic components.