Photosensitive ceramic coating composition

Claim 1

A photosensitive ceramic coating composition which is fireable in a substantially nonoxidizing atmosphere comprising an admixture of: (a) finely divided particles of ceramic solids having a surface area-to-weight ratio of no more than 10 m 2 /g and at least 75 wt. % of the particles having a size of 1-10 μm, and (b) finely divided particles of an inorganic binder having a glass transition temperature of 550°-825° C., a surface area-to-weight ratio of no more than 10 m 2 /g and at least 95 wt. % of the particles having a size of 1-10 μm, the weight ratio of (b) to (a) being 0.6-2, dispersed in an organic medium comprising (c) an organic polymeric binder selected from the group consisting of (1) homopolymer and copolymers of C 1-10 alkyl acrylates, C 1-10 alkyl methacrylates, alpha-methylstyrene and 0-2 wt. % ethylenically unsaturated carboxylic acid, amine or silane-containing compounds, (2) homopolymers and copolymers of C 1-10 mono-olefins, and (3) homopolymers and copolymers of C 1-4 alkylene oxide and mixtures thereof, the binder comprising 5-25 wt. % basis total inorganic solids, and (d) a photoinitiation system, dissolved in (e) photohardenable monomer, the monomer comprising 5-45% wt. of the dry photopolymerizable layer and (f) an volatile organic solvent.