Bayer Aktiengesellschaft

Otto Krist

Herbert Salzburg

Hans-Joachim Schittenhelm

Werner Joseph

Heinz Drave

Jozef Luypaert

The present invention relates to metal substrates which are coated with electrically insulating layers whose electrical resistance has a low temperature dependence, the insulating layer on said metal substrates consisting essentially of a melted-on material containing 43-47% by weight of B.sub.2 O.sub.3, 29-33% by weight of CaO, 10-15% by weight of SiO.sub.2, 7-10% by weight of Al.sub.2 O.sub.3 and 1-2% by weight of MgO.

Coating for metallic substrates

In the enamelling of metal by applying a ground coat containing an additive, subsequently applying a cover coat, and baking the structure, the improvement which comprises employing as the additive a complexing agent having a solubility in water at 25.degree. C. and at a pH-value of from 4 to 9 of greater than about 0.05 g/l, with the exception of saccharides and their oxidation, reduction and modification products and polyethylene glycol containing up to 50 carbon atoms per molecule.

Enamel frit and a one-bake two- and multilayer enamelling process

The invention relates to a process for two-layer and multi-layer one-bake enamelling, in which saccharides and/or their oxidation, reduction and/or conversion products and/or polyethylene glycol are added during preparation of the ground enamel slip and, optionally, the intermediate enamel slip, the additives containing up to 50 carbon atoms per molecule.

Growing community of inventors

Overath, Germany

Otto Krist