Thermoplastic vulcanizate compositions
In an embodiment, a thermoplastic vulcanizate (TPV) composition is provided. The TPV composition includes a thermoplastic polyolefin; and an ethylene based copolymer rubber, wherein the ethylene based copolymer rubber has: a Mw of from 500,000 g/mol to 3,000,000 g/mol, a Mw/Mn of 4.0 or lower, and a g′ vis of 0.90 or greater. In another embodiment, a TPV composition includes a thermoplastic phase and an ethylene-propylene-diene terpolymer, wherein the thermoplastic vulcanizate composition has: a hardness of from 20 Shore A to 60 Shore D; and a stress relaxation slope of −1 to −5 (1/min) as measured by an Elastocon stress relaxation instrument.
1. A thermoplastic vulcanizate composition comprising:
a thermoplastic polyolefin; and
an ethylene based copolymer rubber, wherein the ethylene based copolymer rubber has:
a Mw of from 500,000 g/mol to 3,000,000 g/mol,
a Mw/Mn of 4.0 or lower,
a g′ vis of 0.90 or greater, and
a Δδ of from 30 to 80 degrees from small amplitude oscillatory shear (SAOS) where Δδ=δ (0.1 rad/s)−δ(128 rad/s), or a large amplitude oscillatory shear (LAOS) branching index of less than 3.
2. The thermoplastic vulcanizate composition of claim 1 , wherein the ethylene-based copolymer rubber is an ethylene-propylene-diene terpolymer comprising an ethylene content of 70 wt % or lower based on a total weight of the terpolymer.
3. The thermoplastic vulcanizate composition of claim 1 , wherein the ethylene-based copolymer rubber is an ethylene-propylene-diene terpolymer, and wherein the ethylene-propylene-diene terpolymer is produced by a slurry polymerization process using a Zeigler-Natta catalyst or a metallocene catalyst.
4. The thermoplastic vulcanizate composition of claim 1 , wherein the ethylene based copolymer rubber is an ethylene-propylene-diene terpolymer, and wherein the ethylene-propylene-diene terpolymer is produced by a solution polymerization process using a Zeigler-Natta catalyst or a metallocene catalyst.
5. The thermoplastic vulcanizate composition of claim 1 , further comprising an oil.
6. The thermoplastic vulcanizate composition of claim 5 , wherein the oil is a mineral oil, a synthetic oil, or a combination thereof.
7. The thermoplastic vulcanizate composition of claim 6 , wherein the mineral oil is an aromatic oil, a naphthenic oil, a paraffinic oil, an isoparaffinic oil, a synthetic oil or a combination thereof.
8. The thermoplastic vulcanizate composition of claim 1 , further comprising a compatibilizer, a filler, or a nucleating agent.
9. The thermoplastic vulcanizate composition of claim 1 , further comprising calcium carbonate, clay, silica, talc, titanium dioxide, carbon black, mica, wood flour, a nucleating agent or a combination thereof.
10. The thermoplastic vulcanizate composition of claim 1 , further comprising a curative system, wherein the curative system comprises a curative.
11. The thermoplastic vulcanizate composition of claim 10 , wherein the curative comprises a phenolic resin, a peroxide, a maleimide, a silicon-based curative, a silane-based curative system, sulfur-based cure system, or a combination thereof.
12. The thermoplastic vulcanizate composition of claim 10 , wherein the curative is a hydrosilylation curative.
13. The thermoplastic vulcanizate composition of claim 10 , wherein the curative is a phenolic resin.
14. The thermoplastic vulcanizate composition of claim 1 , wherein the ethylene based copolymer rubber has a Mw of from 600,000 g/mol to 1,000,000 g/mol.
15. The thermoplastic vulcanizate composition of claim 1 , wherein the ethylene based copolymer rubber has a Mw/Mn of 3.0 or lower.
16. The thermoplastic vulcanizate composition of claim 15 , wherein the ethylene based copolymer rubber has a Mw/Mn of 2.5 or lower.
17. The thermoplastic vulcanizate composition of claim 1 , wherein the ethylene based copolymer rubber has a g′ vis of 0.95 or greater.
18. The thermoplastic vulcanizate composition of claim 1 , wherein the ethylene based copolymer rubber has an ethylene content of from 50 wt % to 70 wt % based on a total weight of the ethylene based copolymer rubber.
19. The thermoplastic vulcanizate composition of claim 1 , wherein the ethylene based copolymer rubber terpolymer has an ethylene content of from 55 wt % to 65 wt % based on a total weight of the ethylene based copolymer rubber terpolymer.
20. The thermoplastic vulcanizate composition of claim 1 , wherein the ethylene based copolymer rubber has a dry Mooney Viscosity (ML 1+4 at 125° C.) of 250 MU or greater.
21. A thermoplastic vulcanizate composition comprising:
a thermoplastic polyolefin; and
an ethylene based copolymer rubber, wherein the ethylene based copolymer rubber has:
a Mw of from 500,000 g/mol to 3,000,000 g/mol,
a Mw/Mn of 4.0 or lower, and
a g′ vis of 0.90 or greater,
wherein the thermoplastic olefin is a polypropylene and the ethylene based copolymer rubber is an ethylene-propylene-diene terpolymer.
22. The thermoplastic vulcanizate composition of claim 21 , wherein the diene of the ethylene-propylene-diene terpolymer is 5-ethylidene-2-norbornene (ENB), 5-vinyl-2-norbornene (VNB), or a combination thereof.
23. The thermoplastic vulcanizate composition of claim 21 , wherein the diene content of the ethylene-propylene-diene terpolymer is from 3 wt % to 15 wt % based on the total weight of the ethylene-propylene-diene terpolymer.
24. The thermoplastic vulcanizate composition of claim 21 , wherein the diene content of the ethylene-propylene-diene terpolymer is from 4 wt % to 12 wt % based on the total weight of the ethylene-propylene-diene terpolymer.
25. The thermoplastic vulcanizate composition of claim 21 , wherein the diene content of the ethylene-propylene-diene terpolymer is from 4 wt % to 9 wt % based on the total weight of the ethylene-propylene-diene terpolymer.