Substrate comprising an abrasion-resistant diffusion barrier layer system
AssigneeInstitut fuer Neue Materialien gemeinnuetzige GmbH
InventorsMartin Mennig, Peter W. Oliveira, Helmut Schmidt
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Abstract
A substrate has an abrasion-resistant diffusion barrier layer system having: a hard base layer including a coating composition based on a polymer containing reactive surface groups; and a nanostructured topcoat obtained by applying a nanoscale composition comprising sol particles and/or particulate solids to the basecoat and then curing it. The system features good abrasion resistance and diffusion barrier effect, and is particularly suitable as a protective coat for plastic substrates.
Claims32
A substrate having an abrasion-resistant diffusion barrier coat system, wherein the coat system comprises:
- (a) a hard basecoat comprising a coating composition based on compounds which have been polymerized or cured thermally or photochemically to form a polymer;
- (b) a nanostructured topcoat obtainable by applying a composition comprising at least one of nanoscale sol particles and particulate solids to the basecoat while the basecoat comprises reactive surface groups, and then carrying out at least one of a heat treatment and a curing operation.
A substrate having an abrasion-resistant diffusion barrier coat system, wherein the coat system comprises:
- (a) a hard basecoat comprising a coating composition based on compounds which have been polymerized or cured thermally or photochemically to form a polymer;
- (b) a nanostructured topcoat obtained by applying a composition comprising at least one of nanoscale sol particles and particulate solids to the basecoat while the basecoat still comprises reactive surface groups, and then carrying out at least one of a heat treatment and a curing operation;
- the coating composition of the basecoat comprising a polycondensate obtained by a sol-gel process and derived from:
- (A) one or more silanes of formula RaSiX(4-a) where each R independently represents a non-hydrolyzable group;
- each X independently represents a hydroxy group or a hydrolyzable group;
- and a is 0, 1, 2 or 3 and is greater than 0 for at least 40 mol % of the one or more silanes;
- or an oligomer derived therefrom;
- (B) optionally, one or more compounds of at least one of glass-forming elements and ceramic-forming elements.
A process for producing a substrate provided with an abrasion-resistant diffusion barrier coat system, comprising:
- (a) applying to the substrate a coating composition based on compounds which are thermally or photochemically polymerizable or curable to form a polymer;
- (b) at least one of curing and polymerizing the composition to form a coating which comprises reactive surface groups,
- (c) applying a composition comprising at least one of nanoscale sol particles and particulate solids to the coating of (b);
- (d) at least one of curing and heat-treating the composition of (c) to form a topcoat.
Dependencies are inferred from the claim text.