Polymeric epoxy resin composition
View Patent ↗The invention relates to a polymeric composition containing: a) at least one epoxy resin; b) at least one copolymer with groups, which react with epoxy resins, and with a glass transition temperature T g of −20° C. or lower, c) nanoparticles having a mean particle size d max ranging from 5 to 150 nm that is measured by means of a small-angle neutron scattering (SANS). The inventive composition enables the production of adhesives, composite materials, coatings and casting compounds exhibiting improved mechanical properties, particularly improve impact strength.
1. A polymeric composition comprising:
a) at least one epoxy resin,
b) at least one copolymer having epoxide-reactive groups and a glass transition temperature T g of −20° C. or less,
c) nanoparticles having an average particle size d max as measured by means of small-angle neutron scattering of 5 to 40 nm,
wherein when the composition is cured, the copolymer forms rubber domains having an average size of 0.05 to 20 μm.
2. The composition of claim 1 , wherein said at least one epoxy resin is selected from the group consisting of polyglycidyl ethers and epoxidized cycloaliphatics.
3. The composition of claim 1 , wherein the glass transition temperature T g of the copolymer is −20 to −100° C.
4. The composition of claim 3 , wherein the glass transition temperature T g of the copolymer is −30 to −100° C.
5. The composition of claim 3 , wherein the glass transition temperature T g of the copolymer is −40 to −100° C.
6. The composition of claim 3 , wherein the glass transition temperature T g of the copolymer is −50 to −100° C.
7. The composition of claim 3 , wherein the glass transition temperature T g of the copolymer is −60 to −100° C.
8. The composition of claim 1 , wherein the fraction of the copolymer as a proportion of the composition is 2% to 30% by weight.
9. The composition of claim 8 , wherein the fraction of the copolymer as a proportion of the composition is 4% to 18% by weight.
10. The composition of claim 1 , wherein the copolymer is a carboxy-terminated butadiene-acrylonitrile.
11. The composition of claim 1 , wherein the nanoparticles are selected from the group consisting of silicon dioxides, carbonates, and montmorillonite.
12. The composition of claim 1 , wherein the average particle size d max of the nanoparticles is between 8 and 30 nm.
13. The composition of claim 12 , wherein the average particle size d max of the nanoparticles is between 10 and 25 nm.
14. The composition of claim 1 , wherein the maximum width at half peak height of the distribution curve of the particle size of the nanoparticles is not more than 1.5 d max .
15. The composition of claim 14 , wherein the maximum width at half peak height of the distribution curve of the particle size of the nanoparticles is not more than 1.2 d max .
16. The composition of claim 14 , wherein the maximum width at half peak height of the distribution curve of the particle size of the nanoparticles is not more than 0.75 d max .
17. The composition of claim 1 , wherein the nanoparticles have a monomodal or multimodal distribution curve.
18. The composition of claim 17 , wherein the distribution curve is monomodal, bimodal or trimodal.
19. An adhesive comprising a polymeric composition of claim 1 .
20. The adhesive of claim 19 , wherein said at least one epoxy resin is selected from the group consisting of bisphenol A- and bisphenol F-based resins.
21. The adhesive of claim 19 , wherein the fraction of the nanoparticles as a proportion of the polymeric composition is 0.5% to 5% by weight.
22. A composite comprising a polymeric composition of claim 1 .
23. The composite of claim 22 , wherein said at least one epoxy resin is selected from the group consisting of bisphenol A- and bisphenol F-based resins, novolak resins, and aromatic glycidyl-amines.
24. The composite of claim 22 , wherein the fraction of the nanoparticles as a proportion of the polymeric composition is 3% to 20% by weight.
25. A coating comprising a polymeric composition of claim 1 .
26. The coating of claim 25 , wherein said at least one epoxy resin is selected from the group consisting of bisphenol A- and bisphenol F-based resins, and also epoxidized cycloaliphatics.
27. The coating of claim 25 , wherein the fraction of the nanoparticles as a proportion of the polymeric composition is 10% to 50% by weight.
28. A casting compound comprising the polymeric composition of claim 1 .
29. The casting compound of claim 28 , wherein said at least one epoxy resin is selected from the group consisting of bisphenol A- and bisphenol F-based resins.
30. The casting compound of claim 28 , wherein the fraction of nanoparticles as a proportion of the polymeric composition is 10% to 50% by weight.
31. Method of forming a product using a polymeric composition, comprising:
i.) providing the polymeric composition of claim 1 ; and
ii) producing a product using said composition, wherein said product is selected from the group consisting of an adhesive, a composite material, a coating, and a casting compound.
32. The composition of claim 1 , wherein in the cured composition the copolymer forms rubber domains having an average size of 0.1 to 10 μm.
33. The composition of claim 1 , wherein in the cured composition the copolymer forms rubber domains having an average size of 0.2 to 4 μm.