Bio-sourced transparent and ductile polycarbonate blends
View Patent ↗Bio-sourced polycarbonate compositions comprising, for example, a styrene-ethylene-butadiene-styrene polymer are disclosed. These polycarbonate compositions can exhibit improved ductility and/or ageing resistance compared to conventional polycarbonate compositions. Methods for the preparation of the bio-sourced polycarbonate compositions are also disclosed.
1. A polycarbonate composition prepared from a bio-sourced isosorbide, the polycarbonate composition comprising a styrene-ethylene-butylene-styrene polymer and a styrenic epoxy, wherein the styrene-ethylene-butylene-styrene comprises from about 1 wt. % to about 6 wt. % of the composition, and wherein the styrene-ethylene-butylene-styrene comprises from about 33 wt. % to about 67 wt. % of styrene.
2. The composition of claim 1 , wherein the polycarbonate comprises an isosorbide-bis-phenol A polycarbonate-C36 diacid terpolymer.
3. The composition of claim 2 , wherein the terpolymer comprises about 65 mole % isosorbide.
4. The composition of claim 2 , wherein the terpolymer comprises about 80 mole % isosorbide.
5. The composition of claim 1 , having a bio-sourced isosorbide content of at least about 60 wt. %.
6. The composition of claim 1 , having a bio-sourced isosorbide content of at least about 70 wt. %.
7. The composition of claim 1 , having a notched Izod impact strength of at least about 10 kJ/m 2 .
8. The composition of claim 1 , having a notched Izod impact strength of at least about 15 kJ/m 2 .
9. The composition of claim 1 , having a notched Izod impact strength of at least about 20 kJ/m 2 .
10. The composition of claim 1 , having a notched Izod impact strength of at least 4 times that of a polycarbonate prepared from a bio-sourced isosorbide not comprising a styrene-ethylene-butylene-styrene polymer.
11. The composition of claim 1 , having a notched Izod impact strength of at least 5 times that of a polycarbonate prepared from a bio-sourced isosorbide not comprising a styrene-ethylene-butylene-styrene polymer.
12. The composition of claim 1 , having a scratch resistance similar to or greater than that of a polycarbonate prepared from a bio-sourced isosorbide not comprising a styrene-ethylene-butylene-styrene polymer.
13. The composition of claim 1 , wherein the composition does not delaminate under tensile fracture.
14. The composition of claim 1 , wherein the epoxy comprises at least about 2 wt. % of the composition.
15. The composition of claim 1 , wherein the epoxy comprises about 3 wt. % of the composition.
16. The composition of claim 1 , wherein upon exposure to heat and hydro aging the composition exhibits a color shift of less than about 1.
17. The composition of claim 1 , wherein upon exposure to heat and hydro aging the composition exhibits a color shift of less than about 0.5.
18. The composition of claim 1 , wherein upon exposure to UV aging the composition exhibits a color shift of less than about 1.
19. The composition of claim 1 , wherein upon exposure to UV aging the composition exhibits a color shift of less than about 0.5.
20. The composition of claim 1 , wherein the styrene-ethylene-butylene-styrene comprises about 67 wt. % styrene.
21. The composition of claim 20 , wherein the composition has a transparency of at least about 80%.
22. The composition of claim 20 , wherein the composition has a transparency of at least 95% of the transparency of a polycarbonate prepared from a bio-sourced isosorbide not comprising a styrene-ethylene-butylene-styrene polymer.
23. The composition of claim 20 , wherein the composition does not delaminate under tensile fracture.
24. The composition of claim 20 , wherein the epoxy comprises at least about 2 wt. % of the composition.
25. The composition of claim 20 , wherein the epoxy comprises about 3 wt. % of the composition.
26. The composition of claim 4 , having a notched Izod impact strength of at least about 10 kJ/m 2 .
27. The composition of claim 4 , wherein the composition has a transparency of at least about 80%.
28. The composition of claim 4 , wherein the composition has a transparency of at least 95% of the transparency of a polycarbonate prepared from a bio-sourced isosorbide not comprising a styrene-ethylene-butylene-styrene polymer.
29. A method for preparing a bio-sourced polycarbonate composition, the method comprising a step of contacting a bio-sourced isosorbide-bis-phenol A polycarbonate-C36 diacid terpolymer (Iso ter PC) with a styrene-ethylene-butylene-styrene polymer, and further comprising an additional step of contacting a styrenic epoxy with at least one of the Iso ter PC, the styrene-ethylene-butylene-styrene polymer, or a combination thereof.
30. The method of claim 29 , wherein the Iso ter PC comprises at least about 60 wt. % bio-content.
31. The method of claim 29 , wherein the Iso ter PC comprises at least about 80 wt. % bio-content.
32. The method of claim 29 , wherein the Iso ter PC comprises about 65 mol % isosorbide.
33. The method of claim 29 , wherein the Iso ter PC comprises about 80 mol % isosorbide.
34. The method of claim 29 , wherein the styrene-ethylene-butylene-styrene comprises from about 17 wt. % to about 67 wt. % styrene.
35. The method of claim 29 , wherein the styrene-ethylene-butylene-styrene comprises about 33 wt. % styrene.
36. The method of claim 29 , wherein the styrene-ethylene-butylene-styrene comprises about 67 wt. % styrene.
37. The method of claim 29 , wherein the styrene-ethylene-butylene-styrene comprises about 6 wt. % of the total composition.