Abstract: A process is proposed for preparing hydroxyaromatics by heterogeneous catalytic reaction of hydroxyaromatics with C1-C4-alkanols in a microreactor (10), comprising the steps of: a) introducing the hydroxyaromatic and at least one compound selected from the group consisting of C1-C4-alkanols as reactants into at least one inlet orifice (22) of the microreactor (10) comprising at least one microreactor unit (18), b) passing the reactants through at least one microreactor unit (18) of the microreactor (10), said unit comprising a multitude of microchannels (28), said microchannels (28) having a lateral extent of less than 1 mm, and a heterogeneous catalyst being incorporated in the microchannels (28) for conversion of the reactants, c) passing the hydroxyaromatics prepared out through at least one outlet orifice (24) of the microreactor (10).

Abstract: Compositions comprising at least one epoxy resin and/or reactive diluents, at least one hardener for the at least one epoxy resin, at least one curing indicator, wherein the colour of the composition changes depending on the curing degree, a process for determining sufficient cure of a composition comprising providing a composition comprising at least one epoxy resin and a hardener for the epoxy resin, adding a curing indicator, applying curing conditions to the coloured composition until the composition changes its colour and use of polymeric colourants as curing degree indicator, wherein the curing indicator is a polymeric colourant consisting of chromophores which are chemically bound to polymers having reactive groups.

Abstract: Solvent composition comprising ethanol, aromatic hydrocarbon or hydrocarbon mixture, high-boiling solvent, wire enamel formulation based on polyvinyl formal and comprising the solvent composition, preparation process and use.

Abstract: Reactive system comprising at least one component (I) composed of particles in very finely divided form present in a liquid phase of at least one further component (II) with which component (I) is capable of reacting following activation through energy supply, wherein component (I) is not soluble in component (II), process for preparation and use.

Abstract: Described is a polyurethane wire enamel composed of at least one blocked polyisocyanate adduct, blocked with alkylphenols, at least one hydroxy polyester comprising ester and/or imide and/or amide groups, at least one hydrocarbon-based organic solvent, and further auxiliaries and additives.