Exterior paint formulation
The present invention provides increased stain resistance, tannin blocking, adhesion, and various other properties. A composition in accordance with the principles of the present invention comprises at least two binders, nanoparticle pigment, and pigmentary titanium dioxide. In one embodiment, the present invention relates to a coating on a substrate wherein the coating has two binders, nanoparticle metal oxide pigment, and pigmentary titanium dioxide. Various additives may be included to formulate paint as known in the art.
1. A paint composition comprising:
a first acrylic primer binder of about 285 pounds per 100 gallons to about 630 pounds per 100 gallons;
a second acrylic topcoat binder of about 50 pounds per 100 gallons to about 95 pounds per 100 gallons;
a third acrylic binder of greater than 0 and up to 180 pounds per 100 gallons, the third acrylic binder consisting of a styrene acrylic binder;
a first metal oxide comprising pigmentary titanium dioxide; and
a second metal oxide comprising a nanoparticle-sized metal oxide pigment of about 2 pounds per 100 gallons to about 20 pounds per 100 gallons,
wherein the paint composition has a PVC of about 4 to about 55 and a pigment to binder ratio of about 0.10 to about 3.0.
2. The composition of claim 1 , wherein the nanoparticle-sized metal oxide pigment comprises zinc oxide.
3. The composition of claim 1 , wherein the nanoparticle-sized metal oxide pigment comprises particles having an average particle size of less than about 100 nanometers.
4. The composition of claim 3 , wherein the nanoparticle-sized metal oxide pigment comprises particles having an average particle size of between about 30 nanometers and about 65 nanometers.
5. The composition of claim 1 , wherein the first acrylic primer binder consists essentially of acrylic.
6. The composition of claim 1 , wherein the second acrylic topcoat binder consists essentially of acrylic.
7. The composition of claim 1 , wherein the first acrylic primer binder comprises self-crosslinking polymer.
8. The composition of claim 1 , wherein the first acrylic binder comprises a 100% acrylic binder intended for use as a primer vehicle.
9. The composition of claim 1 , wherein the ratio of the first primer binder to the second topcoat binder is about 80:20.
10. A paint composition comprising:
an acrylic primer binder in an amount of 340 to 430 lbs per 100 gallons of paint;
an acrylic topcoat binder in an amount of 70 to about 100 lbs per 100 gallons of paint;
a styrene acrylic topcoat binder in an amount greater than 0 to 180 lbs per 100 gallons of paint;
titanium dioxide in an amount greater than 0 to 350 lbs per 100 gallons of paint;
zinc oxide in an amount greater than 0 to 7 lbs per 100 gallons of paint; and
a nano particle inorganic oxide in an amount 4 to 20 lbs per 100 gallons of paint.