Energy saving self-cleaning roof paint

1. A paint composition comprising:

water;

a binder composition including first acrylic resin having an average particle size from about 0.2 to 1 micron and a glass transition temperature less than about 10° C.;

a powder catalyst composition including anatase titanium dioxide with a surface area from about 50 to 500 m 2 /g;

a first pigment composition that includes rutile titanium dioxide;

a second pigment composition that is different than the first pigment composition; and

a fluoropolymer-containing composition including polyvinylidene fluoride and a second acrylic resin, the second acrylic resin being the same or different than the first acrylic resin.

2. The paint composition of claim 1 wherein the fluoropolymer-containing composition includes polyvinylidene fluoride particles and acrylic resin particles each independently having an average particle size from about 0.1 to about 0.6 microns.

3. The paint composition of claim 1 wherein the first acrylic resin is formed by one or more monomers selected from the group consisting of methyl acrylate, ethyl acrylate, 2-chloroethyl vinyl ether, 2-ethylhexyl acrylate, hydroxyethyl methacrylate, butyl acrylate, butyl methacrylate, trimethylolpropane triacrylate, pentafluorophenyl methacrylate, pentafluorophenyl acrylate, 1,1,1,3,3,3-hexafluoroisopropyl acrylate, bis-(2,2,2-trifluoroethyl) itaconate, 1H,1H,3H-hexafluorobutyl acrylate, 1H,1H,7H-dodecafluoroheptyl methacrylate, 2,2,2-trifluoroethyl acrylate, 2,2,2-trifluoroethyl methacrylate, 1H,1H,2H,2H -heptadecafluorodecyl methacrylate, 1H,1H,2H,2H-heptadecafluo rodecyl acrylate, 1H,1H,5H-octafluo ropentyl acrylate, 1H,1H,3H-tetrafluoropropyl methacrylate, 1H,1H,3H-hexafluorobutyl methacrylate, 1H,1H,5H-octafluoropentyl methacrylate, and combinations thereof.

4. The paint composition of claim 1 wherein

the binder composition is present in an amount from about 5 to 35 weight percent;

the powder catalyst composition is present in an amount from about 1 to 10 weight percent;

the first pigment composition is present in an amount from about 5 to 20 weight percent;

the second pigment composition is present in an amount from about 5 to 25 weight percent;

the fluoropolymer-containing composition is present in an amount from about 5 to 25 weight percent; and

the balance is water.

5. The paint composition of claim 1 further comprising an additive selected form the group consisting of rheology modifiers, surfactants, defoamers, organic solvents, pH adjusters, dispersants, coalescents, and biocides.

6. The paint composition of claim 5 wherein the additive is present in an amount from about 1 to 10 weight percent.

7. The paint composition of claim 1 wherein the binder composition has a glass transition temperature less than about 0° C.

8. The paint composition of claim 1 wherein the binder composition has a glass transition temperature from about −40° C. to about 0° C.

9. The paint composition of claim 1 wherein the fluoropolymer-containing composition has a glass transition temperature less than about 20° C.

10. The paint composition of claim 1 wherein the fluoropolymer-containing composition has a glass transition temperature from about 0° C. to about 20° C.

11. A paint composition comprising:

a binder composition present in an amount from about 5 to 35 weight percent, the binder composition including a first acrylic resin having an average particle size from about 0.2 to 1 micron and a glass transition temperature less than about 10° C.;

a powder catalyst composition present in an amount from about 1 to 10 weight percent, the powder catalyst composition including anatase titanium dioxide with a surface area from about 50 to 500 mm 2 /g;

a first pigment composition that includes rutile titanium dioxide present in an amount from about 5 to 20 weight percent;

a second pigment composition that is different than the first pigment composition present in an amount from about 5 to 25 weight percent;

a fluoropolymer-containing composition present in an amount from about 5 to 25 weight percent; and

balance water.

12. The paint composition of claim 11 wherein the fluoropolymer-containing composition includes polyvinylidene fluoride particles and acrylic resin particles each independently having an average particle size from about 0.1 to about 0.6 microns.

13. The paint composition of claim 11 wherein the first acrylic resin is formed by one or more monomers selected from the group consisting of methyl acrylate, ethyl acrylate, 2-chloroethyl vinyl ether, 2-ethylhexyl acrylate, hydroxyethyl methacrylate, butyl acrylate, butyl methacrylate, trimethylolpropane triacrylate, pentafluorophenyl methacrylate, pentafluorophenyl acrylate, 1,1,1,3,3,3-hexafluoroisopropyl acrylate, bis-(2,2,2-trifluoroethyl) itaconate, 1H,1H,3H-hexafluorobutyl acrylate, 1H,1H,7H-dodecafluoroheptyl methacrylate, 2,2,2-trifluoroethyl acrylate, 2,2,2-trifluoroethyl methacrylate, 1H, 1H,2H,2H-heptadecafluorodecyl methacrylate, 1H,1H,2H,2H-heptadecafluorodecyl acrylate, 1H,1H,5H-octafluoropentyl acrylate, 1H,1H,3H-tetrafluoropropyl methacrylate, 1H,1H,3H-hexafluorobutyl methacrylate, 1H,1H,5H-octafluoropentyl methacrylate, and combinations thereof.

14. The paint composition of claim 11 further conprising an additive selected for the group consisting of rheology modifiers, surfactants, defoamers, organic solvents, pH adjusters, dispersants, coalescents, and biocides.

15. The paint composition of claim 14 wherein the additive is present in an amount from about 1 to 10 weight percent.

16. The paint composition of claim 11 wherein the binder composition has a glass transition temperature from about −40° C. to about 0° C.

17. The paint composition of claim 11 wherein the fluoropolymer-containing composition has a glass transition temperature less than about 20° C.

18. The paint composition of claim 11 wherein the fluoropolymer-containing composition has a glass transition temperature from about 0° C. to about 20° C.