Primed inorganic substrates overcoated with curable protective compositions

Claim 1

A method for preparing a layered structure comprising the steps of: a. providing a substrate selected from a metal, metal oxide, or ceramic, b. coating at least one surface of said substrate with a primer composition comprising: (1) one part by weight of a non-amino- or non-amido-containing silane of the formula [R.sup.1 ].sub.m --Si--[R.sup.2 ].sub.n ( 1) in which R 1 is an alkyl or cycloalkyl group that can be unsubstituted or substituted by an ethenyl, methethenyl, acryloxy, methacryloxy, epoxy, mercapto, or an isocyanato group, said substituted group having a total of two to ten carbon atoms and said unsubstituted group having a total of one to eight carbon atoms; R 2 is a hydrolyzable group selected from alkoxy groups having one to eight carbon atoms and acyloxy groups having two to eight carbon atoms; m is an integer from 1 to 3; n is an integer from 1 to 3, with the proviso that m+n=4; (2) 1 to 50 parts by weight of metal ester of the formula M[OR.sup.3 ].sub.x ( 2) in which M is a metal selected from a group comprising titanium, tantalum, zirconium, aluminum, and antimonyl; R 3 is an alkyl group having from one to eight carbon atoms; and x is equal to the number of valence bonds of M; (3) 0.5:1 to 4:1 moles by weight of an inorganic acidic material, or 0.5:1 to 8:1 moles by weight of an organic acidic material, compared to the total moles by weight of metal ester plus silane; and (4) an amount of solvent consisting essentially of organic solvent sufficient to provide for blending of the components of said primer composition; c. overcoating said primer composition with at least one layer of an uncured organic monomer composition, said monomer selected from epoxy and vinyl monomers, and d. curing said organic composition.

Claim 2

A method for preparing a layered structure comprising the steps of: a. providing a substrate selected from a metal, metal oxide, or ceramic, b. coating at least one surface of said substrate with a primer composition comprising: (1) one part by weight of a non-amino- or non-amido-containing silane of the formula [R.sup.1 ].sub.m --Si--[R.sup.2 ].sub.n ( 1) in which R 1 is an alkyl or cycloalkyl group that can be unsubstituted or substituted by an ethenyl, methethenyl, acryloxy, methacryloxy, epoxy, mercapto, or an isocyanato group, said substituted group having a total of two to ten carbon atoms and said unsubstituted group having a total of one to eight carbon atoms; R 2 is a hydrolyzable group selected from alkoxy groups having one to eight carbon atoms and acyloxy groups having two to eight carbon atoms; m is an integer from 1 to 3; n is an integer from 1 to 3, with the proviso that m+n=4; (2) 1 to 50 parts by weight of metal ester of the formula M[OR.sup.3 ].sub.x ( 2) in which M is a metal selected from a group comprising titanium, tantalum, zirconium, aluminum, and antimonyl; R 3 is an alkyl group having from one to eight carbon atoms; and x is equal to the number of valence bonds of M; (3) 0.5:1 to 4:1 moles by weight of an inorganic acidic material, or 0.5:1 to 8:1 moles by weight of an organic acidic material, compared to the total moles by weight of metal ester plus silane; and (4) an amount of solvent consisting essentially of organic solvent sufficient to provide for blending of the components of said primer composition; c. overcoating said primer composition with at least one layer of an uncured organic monomer composition, said monomer selected from epoxy and vinyl monomers, and d. curing said organic composition.