Coating compositions

1. A composition, comprising:

an epoxy-containing component comprising an epoxide functionality of greater than 1.0 to less than 3.2 in an amount of 45% by weight to 85% by weight based on total weight of the composition;

elastomeric particles in an amount of greater than 11% by weight to 25% by weight based on total weight of the composition; and

a curing component activatable by an external energy source, the curing component comprising at least one guanidine in an amount of 2% by weight to 20% by weight based on total weight of the composition and comprising a D90 particle size of 25 μm measured by dynamic light scattering;

wherein at least 50% by weight of the elastomeric particles comprise a styrene butadiene core based on total weight of the elastomeric particles; and

wherein at least 50% of the elastomeric particles comprise an average particle size of at least 20 nm and less than 150 nm as measured by transmission electron microscopy.

2. The composition of claim 1 , wherein the elastomeric particles are phase-separated from the epoxy-containing component.

3. The composition of claim 1 , wherein the epoxy-containing component comprises bisphenol A polyepoxide, bisphenol F polyepoxide, an epoxy novolac resin, or combinations thereof.

4. The composition of claim 1 , wherein the epoxy-containing component is present in an amount of 55% to 85% by weight based on total weight of the composition.

5. The composition of claim 1 , wherein no more than 50% by weight of the elastomeric particles comprise a polybutadiene core and/or a polysiloxane core based on total weight of the elastomeric particles.

6. The composition of claim 1 , wherein the at least one guanidine comprises dicyandiamide.

7. The composition of claim 1 , further comprising fillers in an amount of no more than 20% by weight based on total weight of the composition and/or additives in an amount of no more than 20% by weight based on total weight of the composition.

8. The composition of claim 1 , wherein the composition is substantially free of additives, platy fillers, and/or free radical initiators.

9. The composition of claim 1 , further comprising a second curing agent comprising a latent curing catalyst, an active curing catalyst, or combinations thereof.

10. The composition of claim 1 , wherein the composition is a coating composition, an adhesive composition, or a sealant composition.

11. A coated substrate, wherein at least one surface of the substrate is at least partially coated with the composition of claim 1 .

12. The coated substrate of claim 11 , wherein at least one of the surfaces of the coated substrate is 100% water break free.

13. The coated substrate of claim 12 , wherein the substrate comprises a protective clothing.

14. The coated substrate of claim 11 , wherein at least one of the surfaces of the coated substrate is non-water break free.

15. The coated substrate of claim 11 , wherein the composition, in an at least partially cured state, has a hardness of greater than 100 N/mm 2 and an elongation of at least 40%.

16. A part at least partially coated with the composition of claim 1 .

17. An article, comprising:

a first substrate;

a second substrate; and

the composition of claim 1 positioned between the first and second substrates.

18. The article of claim 17 , wherein the composition, in an at least partially cured state, has a bulk shear stress of at least 33.0 MPa measured in accordance with ISO 11003-2, a bulk shear strain of at least 34.5% measured in accordance with ISO 11003-2, a lap shear strength of greater than 30.0 MPa, measured according to ASTM D1002-10 using 2024-T3 aluminum substrate of 1.6 mm thickness, as measured by an INSTRON 5567 machine in tensile mode with a pull rate of 1.3 mm per minute, and a lap shear displacement at failure of at least 15% of the overlap length.

19. A method for forming a coating on a substrate surface comprising:

applying the composition of claim 1 to a surface of a first substrate; and

applying an external energy source to at least partially cure the composition.

20. The method of claim 19 , further comprising contacting a surface of a second substrate to the composition such that the composition is located between the first substrate and the second substrate.