Stable high temperature coating compositions and methods of preparing and using the same

1 . A coating composition comprising:

calcium carbonate;

titanium dioxide;

opacity pigment composite comprising TiO 2 encapsulated within a precipitated calcium carbonate shell;

calcined diatomaceous earth;

aluminum hydroxide; and

vinyl acrylic polymer;

wherein a weight ratio of calcined diatomaceous earth to vinyl acrylic polymer is from about 0.5:1 to about 5:1; and

wherein the coating composition sustains a stable viscosity after heating to a temperature of at least about 130° F. for at least about 72 hours.

2 . The coating composition of claim 1 , wherein the calcium carbonate is present in an amount from about 20 wt. % to about 40 wt. % based on the dry weight of the composition.

3 . The coating composition of claim 1 , wherein the titanium dioxide is present in an amount from about 10 wt. % to about 40 wt. % based on the dry weight of the composition.

4 . The coating composition of claim 1 , wherein the opacity pigment composite is present in an amount from about 8 wt. % to about 30 wt. % based on the dry weight of the composition.

5 . The coating composition of claim 1 , wherein the calcined diatomaceous earth is present in an amount from about 3 wt. % to about 20 wt. % based on the dry weight of the composition.

6 . The coating composition of claim 1 , wherein the aluminum hydroxide is present in an amount from about 3 wt. % to about 20 wt. % based on the dry weight of the composition.

7 . The coating composition of claim 1 , wherein the vinyl acrylic polymer is present in an amount from about 2 wt. % to about 20 wt. % based on the dry weight of the composition.

8 . The coating composition of claim 1 , wherein the composition further comprises a hydrophobic polymer emulsion present in an amount from about 0.1 wt. % to about 10 wt. %.

9 . The coating composition of claim 1 , wherein the composition further comprises a wetting and dispersing additive comprising an anionic copolymer, wherein the wetting and dispersing additive has an acid value of about 2 mg KOH/g.

10 . The coating composition of claim 1 , wherein the composition further comprises an ethoxylated acetylenic gemini surfactant, present in an amount from about 0.01 wt. % to about 2 wt. %.

11 . The coating composition of claim 1 , wherein the composition further comprises at least one of a clay, a defoamer, or a biocide.

12 . The coating composition of claim 1 , wherein the weight ratio of calcined diatomaceous earth and calcium carbonate to vinyl acrylic polymer is from about 0.5:1 to about 10:1, from about 1:1 to about 10:1, from about 1:1 to about 7:1, or from about 0.5:1 to about 5:1, based on the dry weight of the composition.

13 . The coating composition of claim 1 , wherein the vinyl acrylic polymer has a pH below 7.0.

14 . The coating composition of claim 1 , wherein a weight ratio of calcium carbonate to vinyl acrylic polymer is from about 2:1 to about 15:1, from about 2:1 to about 12:1, from about 2:1 to about 10:1, or from about 3:1 to about 10:1, based on the dry weight of the composition.

15 . The coating composition according to claim 1 , wherein the vinyl acrylic polymer has a Tg of about 17° C.

16 . A coating composition comprising:

calcium carbonate present in an amount from about 20 wt. % to about 40 wt. % based on the dry weight of the composition;

titanium dioxide present in an amount from about 10 wt. % to about 40 wt. % based on the dry weight of the composition;

opacity pigment composite comprising TiO 2 encapsulated within a precipitated calcium carbonate shell present in an amount from about 8 wt. % to about 30 wt. % based on the dry weight of the composition;

calcined diatomaceous earth present in an amount from about 3 wt. % to about 20 wt. % based on the dry weight of the composition;

aluminum hydroxide present in an amount from about 3 wt. % to about 20 wt. % based on the dry weight of the composition; and

vinyl acrylic polymer present in an amount from about 2 wt. % to about 20 wt. % based on the dry weight of the composition;

wherein the vinyl acrylic polymer has a pH below 7.0; and

wherein the coating composition sustained a stable viscosity after heating to a temperature of at least about 130° F. for at least about 72 hours.

17 . The coating composition according to claim 16 , wherein a weight ratio of calcium carbonate to vinyl acrylic polymer is from about 2:1 to about 15:1, from about 2:1 to about 12:1, from about 2:1 to about 10:1, or from about 3:1 to about 10:1, based on the dry weight of the composition.

18 . The coating composition according to claim 17 , wherein a weight ratio of calcined diatomaceous earth to vinyl acrylic polymer is from about 0.5:1 to about 10:1, from about 1:1 to about 10:1, from about 1:1 to about 7:1, or from about 0.5:1 to about 5:1, based on the dry weight of the composition.

19 . The coating composition according to claim 16 , wherein a weight ratio of calcium carbonate and calcined diatomaceous earth to vinyl acrylic polymer is from about 0.5:1 to about 10:1, from about 1:1 to about 10:1, from about 1:1 to about 7:1, or from about 0.5:1 to about 5:1, based on the dry weight of the composition.

20 . The coating composition according to claim 16 , wherein the vinyl acrylic polymer has a Tg of about 17° C.