Latex compositions comprising polysaccharides

1. An aqueous latex composition comprising polysaccharide particles, and a polymer dispersion or polymer emulsion;

wherein the polysaccharide particles comprise at least one polysaccharide comprising:

(i) a poly alpha-1,3-glucan ester compound represented by Structure 1:

wherein

(A) n is at least 6,

(B) each R is independently an —H or a first group comprising —CO—C x —COOH, wherein the —C x — portion of said first group comprises a chain of 2 to 18 carbon atoms, and

(C) the poly alpha-1,3-glucan ester compound represented by Structure 1 has a degree of substitution with the first group of 0.001 to 3.0;

or

(ii) a poly alpha-1,3-glucan ester compound represented by Structure 2:

wherein

(A) n is at least 6,

(B) each R is independently an —H or an acyl group, and

(C) the poly alpha-1,3-glucan ester compound represented by Structure 2 has a degree of substitution with the acyl group of 0.001 to 3.0.

2. The latex composition of claim 1 , wherein the polysaccharide particles have an average particle size in at least one dimension of 20 nm to 5000 microns.

3. The latex composition of claim 1 , wherein the polysaccharide particles are present at 0.01 weight percent polysaccharide solids to 75 weight percent polysaccharide solids, based on the total weight of polysaccharide and polymer solids.

4. The latex composition of claim 1 , wherein the polymer dispersion or polymer emulsion comprises a polymer polymerized from at least one of a (i) copolymerizable monoethylenically unsaturated monomer; ii polyurethane; (iii) epoxy; or (iv) rubber elastomer.

5. The latex composition of claim 4 , wherein the polymer dispersion or polymer emulsion comprises said polymer polymerized from at least one copolymerizable monoethylenically unsaturated monomer.

6. The latex composition of claim 5 , wherein the at least one copolymerizable monoethylenically unsaturated monomer is a vinyl monomer, acrylic monomer, allylic monomer, acrylamide monomer, monocarboxylic unsaturated acid, or dicarboxylic unsaturated acid.

7. The latex composition of claim 4 , wherein the polymer dispersion or polymer emulsion comprises said polyurethane.

8. The latex composition of claim 4 , wherein the polymer dispersion or polymer emulsion comprises said rubber elastomer.

9. The latex composition of claim 8 , wherein the rubber elastomer comprises natural rubber.

10. The latex composition of claim 8 , wherein the rubber elastomer comprises synthetic polyisoprene, styrene butadiene copolymer rubber, ethylene propylene diene monomer rubber, hydrogenated nitrile butadiene rubber, polybutadiene, or neoprene.

11. The latex composition of claim 4 , wherein the polymer dispersion or polymer emulsion comprises said epoxy.

12. The latex composition of claim 1 , wherein the polymer dispersion or polymer emulsion comprises particles having an average particle size in at least one dimension of 10 nm to 2500 nm.

13. The latex composition of claim 1 , wherein the polymer of the polymer dispersion or polymer emulsion is present at 0.5 weight percent polymer solids to 90 weight percent polymer solids, based on the total weight of polysaccharide and polymer solids.

14. The latex composition of claim 1 , further comprising one or more additives selected from a dispersant, rheological aid, antifoam, foaming agent, adhesion promoter, flame retardant, bactericide, fungicide, preservative, optical brightener, pigment, filler, anti-settling agent, coalescing agent, humectant, buffer, colorant, viscosity modifier, antifreeze, surfactant, binder, crosslinking agent, anticorrosion agent, hardener, pH regulator, salt, thickener, plasticizer, stabilizer, extender, or matting agent.

15. The latex composition of claim 1 , wherein the at least one polysaccharide comprises said poly alpha-1,3-glucan ester compound represented by Structure 1.

16. The latex composition of claim 15 , wherein the —C x — portion of said first group comprises a chain of 2 to 6 carbon atoms.

17. The latex composition of claim 1 , wherein the at least one polysaccharide comprises said poly alpha-1,3-glucan ester compound represented by Structure 2.

18. A paint formulation comprising the latex composition of claim 1 .