Abrasion resistant coatings

A film from 0.1 to 500 microns thick comprising a polymer having at least 15 percent by weight of units derived from an epoxy-terminated silane represented by the formulae:

• ##STR22## wherein, each R is independently a non-hydrolyzable divaent hydrocarbon radical of less than 20 carbon atoms, or a divalent radical of less than 20 carbon atoms the backbone of which is C atoms which may be interrupted by individual atoms from the group of N and O, the O atoms in the form of ether linkages,
• m is 1, 2, or 3,
• n is 0, or 1, and
• R' is an aliphatic hydrocarbon radical of less than 10 carbon atoms, an acyl radical of less than 10 carbon atoms, or a radical of the formula (CH.sub.2 CH.sub.2 O).sub.k Z in which k is an integer of at least 1, and Z is hydrogen or an aliphatic hydrocarbon radical of less than 10 carbon atoms,
• cured in the presence of a catalytically active amount of a highly fluorinated sulfonylic catalyst comprising two highly fluorinated aliphatic sulfonyl groups attached directly to an imide or a methylene or highly fluorinated sulfonic catalyst comprising a highly fluorinated aliphatic sulfonic acid or salt thereof.

A method of forming an abrasion resistant coating on a substrate of from 0.1 to 500 microns thickness which comprises curing a composition comprising at least 15 percent by weight units derived from an epoxy-terminated silane represented by the formulae:

• ##STR26## wherein, each R is independently a non-hydrolyzable divalent hydrocarbon radical of less than 20 carbon atoms, or a divalent radical of less than 20 carbon atoms the backbone of which is C atoms which may be interrupted by individual atoms from the group of N and O, the O atoms in the form of ether linkages,
• m is 1, 2, or 3,
• n is 0, or 1, and
• R' is an aliphatic hydrocarbon radical of less than 10 carbon atoms, an acyl radical of less than 10 carbon atoms, or a radical of the formula (CH.sub.2 CH.sub.2 O).sub.k Z in which k is an integer of at least 1, and Z is hydrogen or an aliphatic hydrocarbon radical of less than 10 carbon atoms,
• in catalytic proximity to a catalytically active amount of a highly fluorinated sulfonic catalyst comprising a highly fluorinated aliphatic sulfonic acid or salt thereof or highly fluorinated sulfonylic catalyst comprising two highly fluorinated aliphatic sulfonyl groups attached directly to an imide or a methylene and thereby bonding said composition to said substrate.