Curable film-forming compositions demonstrating burnish resistance and low gloss, and methods of improving burnish resistance of a substrate

A curable film-forming composition comprising:

• (a) a polymeric binder comprising:
• (i) a polysiloxane having reactive functional groups and in which is dispersed protonated silica particles having an average particle size of 2 to 20 microns, wherein the polysiloxane is present in the polymeric binder in an amount of at least 10 percent by weight based on the total weight of solids in the polymeric binder;
• and
• (ii) optionally, at least one additional polymeric resin different from the polysiloxane (i), having reactive functional groups;
• and
• (b) a curing agent containing functional groups that are reactive with the reactive functional groups of (i), (ii), or both;
• wherein after application of the curable film-forming composition to a substrate as a coating and after curing to yield a cured coating, the cured coating demonstrates an initial 85° gloss of less than 30 and an increase in 85° gloss of no more than 10 gloss units when subjected to WET ABRASION TEST METHOD TWO.

A method of improving burnish resistance of a substrate, comprising:

• (1) applying to the substrate a curable film-forming composition to form a coated substrate, and (2) heating the coated substrate, if necessary, to a temperature and for a time sufficient to cure the curable film-forming composition and yield a cured coating;
• wherein said curable film-forming composition comprises:
• (a) a polymeric binder comprising:
• (i) a polysiloxane having reactive functional groups and in which is dispersed protonated silica particles having an average particle size of 2 to 20 microns, wherein the polysiloxane is present in the polymeric binder in an amount of at least 10 percent by weight based on the total weight of solids in the polymeric binder;
• and
• (ii) optionally, at least one additional polymeric resin different from the polysiloxane (i), having reactive functional groups;
• and
• (b) a curing agent containing functional groups that are reactive with the reactive functional groups of (i), (ii), or both;
• wherein after curing, the cured coating demonstrates an initial 85° gloss of less than 30 and an increase in 85° gloss of no more than 10 gloss units when subjected to WET ABRASION TEST METHOD ONE.

A method of improving burnish resistance of a substrate, comprising:

• (1) applying to the substrate a curable film-forming composition to form a coated substrate, and (2) heating the coated substrate, if necessary, to a temperature and for a time sufficient to cure the curable film-forming composition and yield a cured coating;
• wherein said curable film-forming composition comprises:
• (a) a polymeric binder comprising:
• (i) a polysiloxane having reactive functional groups and in which is dispersed protonated silica particles having an average particle size of 2 to 20 microns, wherein the polysiloxane is present in the polymeric binder in an amount of at least 10 percent by weight based on the total weight of solids in the polymeric binder;
• and
• (ii) optionally, at least one additional polymeric resin different from the polysiloxane (i), having reactive functional groups;
• and
• (b) a curing agent containing functional groups that are reactive with the reactive functional groups of (i), (ii), or both;
• wherein after curing, the cured coating demonstrates an initial 85° gloss of less than 30 and an increase in 85° gloss of no more than 10 gloss units when subjected to WET ABRASION TEST METHOD TWO.