Abstract: Uniform protective coatings, particularly solder resist masks, on printed circuit boards can be produced with coating compositions having a viscosity of 200 to 700 m Pas at 25.degree. C. and comprising a solution of a photosensitive, thermally curable, lacquer-forming substance, wherein there is additionally uniformly dispersed 5 to 50% by weight of a finely divided filler.

Abstract: Curable mixtures comprising a polyepoxide compound having on average more than one epoxide group per molecule and a 1,3-diaminopropane of the formula ##STR1## wherein R.sup.1 denotes hydrogen and R.sup.1, R.sup.2, R.sup.3 and R.sup.4 each denote an alkyl having 1 to 12 C atoms, a phenyl or a heterocyclic 5-membered or 6-membered radical, or wherein R.sup.1 and R.sup.2 together with the C atom in the .alpha.-position of the propylenediamine from a substituted or unsubstituted aliphatic 5-membered or 6-membered ring having at most 12 C atoms and R.sup.3 and R.sup.4 together with the two C atoms in the .alpha.-position and the .beta.-position of the propylenediamine form a substituted or unsubstituted aliphatic or N-heterocyclic 5-membered or 6-membered ring having at most 12 C atoms, said mixtures containing 0.5 to 1.5 equivalents of active hydrogen atoms, bonded to nitrogen, in the 1,3-diaminopropane per 1 equivalent of epoxide groups in the epoxide compound.

Abstract: 1,4-Diaminobutanes of the formula ##STR1## in which R.sup.1 is H or --CH.sub.3 and R.sup.2 and R.sup.3 independently of one another are each a radical of the formula ##STR2## in which A is alkyl having 1 to 3 C atoms, --OCH.sub.3, --N(CH.sub.3).sub.2, --Cl or --Br and R.sup.2 also is alkyl having 1 to 3 C atoms, are prepared according to the invention by catalytically hydrogenating succinic acid dinitrile of the formula ##STR3## in the presence of acetic anhydride and hydrolyzing the N,N'-diacetyl-1,4-diaminobutanes thus obtained to diamines of the formula I, which are valuable curing agents for epoxide resins.

Abstract: A heat-curable lacquer containing a compound having glycidyl groups and a concentrated solution of an organic tetracarboxylic acid or the dianhydride thereof. The lacquer can be used for the manufacture of coatings on tin cans, packages, glass bottles and tubes, and of coil coatings.

Abstract: The invention relates to the production of chemically resistant epoxide resin layers on solid surfaces. The liquid component (A) which contains an epoxide compound is preferably mixed, and applied, together with the component (B) containing the curing agent, in a spraying apparatus. The coating is then cured. The curing agent contained in (B) consists essentially of Zn(BF.sub.4).sub.2, quite specific ethers or thioethers, an acid ester of the phosphoric or pyrophosphoric acids or a certain phosphonic acid ester and water. The system is characterized by a short is preferably mixed, and applied, together with the component (b) containing the curing agent, in a spraying apparatus. The coating is then cured. The curing agent contained in (B) consists essentially of ZN(BF.sub.4).sub.2, quite specific ethers or thioethers, an acid ester of th phosphoric or pyrophosphoric acids or a certain phosphonic acid ester and water.

Abstract: A mixture containing a cold-curing liquid synthetic resin combination, an anti-sedimentation agent and aluminium grit is used for the manufacture of antistatic floor coverings or coatings, which are colorful or lightcolored and have a uniform electrical conductivity of good reproducibility.

Abstract: A mixture containing a cold-curing liquid synthetic resin combination, an anti-sedimentation agent and aluminium grit is used for the manufacture of anti-static floor coverings or coatings, which are colorful or lightcolored and have a uniform electrical conductivity of good reproducibility.