Abstract: Epoxy resin systems readily available for curing by the application of an induction heat energy source comprising a silica-filled, low viscosity epoxy resin in combination with an iron oxide or a steel powder.

Abstract: Curing systems for epoxy resins comprising an aliphatic or cycloaliphatic amine in combination with anhydrous methane sulfonic acid as an accelerator for the curing reaction.

Abstract: The method of preparing quaternary pyridinium compounds having the formula ##STR1## WHEREIN R represents alkyl, ##STR2## in which A is phenyl, naphthyl, carbostyrilyl, pyrazolinyl and substituted derivatives thereof where the substitutents are selected from the group consisting of alkyl having 1 to 4 carbon atoms, NO.sub.2, Cl, Br, phenyl, nitrophenyl and methylsulfonate; B is -O-alkylene-, ##STR3## AND C is selected from the group consisting of hydrogen, NHCOR.sub.1 and, when B is -O-alkylene, C can also be --OR.sub.2 -- where R.sub.1 is alkyl of 1 to 4 carbon atoms and R.sub.2 is alkylene of 1 to 4 carbon atoms; and wherein R.sub.4 represents lower alkyl having 1 to 6 carbon atoms, halophenyl, alkylphenyl or naphthyl, m represents an integer of 1 or 2 and m' is equal to m. The process for preparing the particularly designated compounds above comprises contacting pyridine and a hydroxy-containing compound having the formula: R'--(OH).sub.