Ethylene/alpha-olefin interpolymer compositions with improved continuous high temperature resistance
A composition comprising at least the following components: A) one or more ethylene/alpha-olefin interpolymers, which comprise ≤3.5 wt % of a non-conjugated diene, based on the weight of the one or more ethylene/alpha-olefin interpolymers; B) an acid acceptor selected from the following: MgO, ZnO, or combination thereof.
1. A composition comprising at least the following components:
A) one or more ethylene/alpha-olefin interpolymers, which comprise≤3.5 wt % of a non-conjugated diene, based on the weight of the one or more ethylene/alpha-olefin interpolymers;
B) an acid acceptor selected from the following: MgO, ZnO, or combination thereof; and wherein the composition meets the following relationship: {[−10 (wt %) −1 * (diene in wt % (based on wt of component A)−0.9 wt %)]+[3 (phr) −1 * (acid acceptor in phr−9 phr)]}≥0; and
wherein the density of component A ranges from 0.850 to 0.910 g/cc.
2. The composition of claim 1 , wherein the one or more ethylene/alpha-olefin interpolymers comprise≤2.0 wt % of a non-conjugated diene, based on the weight of the one or more ethylene/alpha-olefin interpolymers.
3. The composition of claim 1 , wherein the weight ratio of component A to component B is from 2.0 to 25.
4. The composition of claim 1 , wherein the composition meets the following relationship: {[10 (wt %) 31 1 * (diene in wt % (based on wt of component A)−0.9 wt %)]+[3 (phr) −1 * acid acceptor in phr−9 phr)]}>0.
5. The composition of claim 1 , wherein the Mooney Viscosity (ML 1+4, 125° C.) of component A ranges from 10 MU to 150 MU.
6. The composition of claim 1 , wherein component A is present in an amount from 20 wt % to 55 wt %, based on the weight of the composition.
7. The composition of claim 1 , wherein component A comprises an ethylene/alpha-olefin/diene interpolymer.
8. The composition of claim 7 , wherein the ethylene/alpha-olefin/diene interpolymer is an EPDM.
9. The composition of claim 7 , wherein the ethylene/alpha-olefin/diene interpolymer is present in an amount≥95 wt %, based on the weight of component A.
10. The composition of claim 1 , wherein the component A comprises an ethylene/alpha-olefin/diene interpolymer and an ethylene/alpha-olefin copolymer.
11. The composition of claim 10 , wherein the weight ratio of the ethylene/alpha-olefin/diene interpolymer to the ethylene/alpha-olefin copolymer is from 1.0 to 5.0.
12. The composition of claim 10 , wherein the ethylene/alpha-olefin/diene interpolymer is an EPDM.
13. The composition of claim 10 , wherein the sum weight of the ethylene/alpha-olefin/diene interpolymer and the ethylene/alpha-olefin copolymer is≥95 wt %, based on the weight of component A.
14. The composition of claim 1 , wherein component A comprises an ethylene/alpha-olefin/diene interpolymer and a second ethylene/alpha-olefin/diene interpolymer that are different in one or more of the following properties: wt % diene (based on the weight of the interpolymer), wt % ethylene (based on the weight of the interpolymer), and/or Mooney Viscosity (ML 1+4, 125° C.).
15. The composition of claim 14 , wherein the weight ratio of the ethylene/alpha-olefin/diene interpolymer to the second ethylene/alpha-olefin/diene interpolymer is from 1.0 to 5.0.
16. The composition of claim 14 , wherein each ethylene/alpha-olefin/diene interpolymer is, independently, an EPDM.
17. The composition of claim 14 , wherein the sum weight of the two ethylene/alpha-olefin/diene interpolymers is≥95 wt %, based on the weight of component A.
18. The composition of claim 1 , wherein component A comprises an ethylene/alpha-olefin copolymer.