Photosensitive coating composition and the use thereof for protective purposes
AssigneeCiba-Geigy Corporation
InventorsThaddeus Audykowski, Anton Mentha, Ewald Losert
Life of this patent
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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.
Claims16
A curtain coating composition yielding uniform coatings with good edge covering having a viscosity of 200 to 700 m Pas at 25.degree. C. and comprising a solution of a photosensitive, lacquer-forming substance, wherein the photosensitive substance is a photosensitive epoxide resin having free curable epoxide groups, admixed with a curing agent or admixed with a curing agent and a curing accelerator, which is further characterised in that there are uniformly dispersed in the solution from 5 to 50% by weight, relative to the photosensitive substance, of a finely divided filler, and that the photosensitive substance is additionally thermally curable.
Dependencies are inferred from the claim text.