Surface-tolerant adhesive

Claims

1. A composition comprising (a) a curable resin, (b) a hardener, and (c) a surface modification agent selected from the group consisting of a reactive siloxane, a reactive fluorine compound, and a mixture thereof.

2. The composition according to claim 1, wherein the curable resin is an epoxy resin.

3. The composition according to claim 2, wherein the epoxy resin is selected from a difunctional epoxy resin, a trifunctional epoxy resin, a tetrafunctional epoxy resin, and a mixture thereof.

4. The composition according to claim 1, wherein the curable resin is an acrylic resin.

5. The composition according to claim 1, wherein the curable resin is a polyurethane-polyurea resin.

6. The composition according to claim 1, wherein the surface modification agent is a reactive siloxane having formula (3) or (4): (3) (4), where each X independently represents an alkyl, aryl or cycloalkyl group, each of Y 1 , Y 2 and Y 3 independently represents X or a reactive group containing an amino group, an epoxy group, an anhydride group, an acrylate group, or a perfluoro group, provided that at least one of Y 1 , Y 2 or Y 3 is not X, m is a number from about 1 to 10000, n is a number from 0 to about 10, and each p is independently a number from 0 to about 1000, provided that at least one p has a value of at least about 10.

7. The composition of claim 6, wherein X is methyl.

8. The composition according to claim 7, in which at least one of Y 1 , Y 2 and Y 3 represents an amino group.

9. The composition according to claim 7, in which at least one of Y 1 , Y 2 and Y 3is an epoxy group.

10. The composition according to claim 7, in which at least one of Y 1 , Y 2 and Y 3 is an acrylate group.

11. The composition according to claim 7, in which at least one of Y 1 , Y 2 and Y 3 is a perfluoro group.

12. The composition of claim 1, wherein the surface modification agent is a reactive fluorine compound having the formula R 10 -CF3, where R 10 is CH2=CR 11 COOR 12 -, R 11 represents a hydrogen atom or an alkyl group having from 1 to 3 carbon atoms, and R 12 is an alkyl group having from 1 to 6 carbon atoms.

13. The composition of claim 1, wherein the surface modification agent is a reactive fluorine compound having the formula R 13 -R f -R 13 , where R 13is CH2=CR 14 COO-, R 14 represents a hydrogen atom or an alkyl group having from 1 to 3 carbon atoms, and R f is a compound selected from the group (a)-(e): (e), where * denotes the binding site with R 13 , R F1 is a perfluoroalkyl group having from 1 to 14 carbon atoms, and R F2 , R F3 , R F4 and R F5 each independently represents a hydrogen atom or a perfluoroalkyl group having from 1 to 14 carbon atoms.

14. The composition of claim 1, wherein the surface modification agent is present in an amount of from about 0.0001 to 8.0 wt.% based on the total weight of the composition.

15. The composition of claim 1, further comprising at least one of a rheology modifying agent and an impact enhancing agent.

16. A laminate structure comprising a first substrate bonded to a second substrate and a cured structural adhesive film between the first and second substrates, wherein the structural adhesive film is formed from the composition of claim 1.

17. The laminate structure of claim 16, wherein the first and second substrates are independently selected from a metal, a composite material, a ceramic, and a thermoplastic.

18. A method of joining a first substrate to a second substrate, comprising applying the composition of claim 1 to the surface of at least one of the first substrate and the second substrate to form an adhesive film on the surface, bringing the first substrate and the second substrate into contact so that the adhesive film is located between them, and curing the adhesive film to form an adhesive bond between the first substrate and the second substrate.

19. The method of claim 18, wherein the first substrate and the second substrate are independently selected from a metal, a composite material, a ceramic, and a thermoplastic.