Low ethylene amorphous propylene-ethylene-diene terpolymer compositions
A propylene-ethylene-diene terpolymer and method of making such comprising from 2% to 25% wt % by weight of ethylene, from 98% to 75% wt % by weight propylene and from 1% to 21% wt % by weight of a diene, wherein the terpolymer has a crystallinity of less than 3%, a melt flow rate (MFR) of less than 10 and a Tg by DSC of from −2° C. to −25° C. and methods to prepare the terpolymer are depicted.
1. A propylene-ethylene-diene terpolymer comprising from 2% to 25% by weight of ethylene, from 98% to 75% by weight propylene and from 1% to 21% by weight of a diene, wherein the terpolymer has a crystallinity of less than 3%, a melt flow rate (MFR) of less than 10 g/10 min, and a Tg by DSC of from −2° C. to −25° C., and wherein the terpolymer does not comprise isotactic polypropylene sequences.
2. The propylene-ethylene-diene terpolymer of claim 1 , wherein the percentage ethylene is from 4 percent to 20 percent.
3. The propylene-ethylene-diene terpolymer of claim 1 , wherein the percentage propylene is from 80 percent to 96 percent.
4. The propylene-ethylene-diene terpolymer of claim 1 , wherein the diene comprises 5-ethylidene-2-norbornene (ENB), 1,4-hexadiene; 5-methylene-2norbornene (MNB), 1,6-octadiene, 5-methyl-1,4-hexadiene, 3,7-dimethyl-1,6-octadiene, 1,3-cyclopentadiene, 1,4-cyclohexadiene, vinyl norbornene (VNB) or mixtures thereof.
5. The propylene-ethylene-diene terpolymer of claim 4 , wherein the diene is 5ethylidene-2-norbornene.
6. The propylene-ethylene-diene terpolymer of claim 1 , wherein the Tg is from −4° C. to −25° C.
7. The propylene-ethylene-diene terpolymer of claim 1 , wherein the MFR is from 0.1 to 5 g/10 min.
8. The propylene-ethylene-diene terpolymer of claim 1 , wherein the crystallinity is less than 2%.
9. The propylene-ethylene-diene terpolymer of claim 8 , wherein the crystallinity is less than 1%.
10. A tire tread composition comprising components, by weight of the composition, within the range from:
5 to 75% by weight of a diene elastomer;
0 to 40% by weight of processing oil;
20 to 80% by weight of filler; a
curative agent; and
5 to 30% by weight of an propylene-ethylene-diene terpolymer of claim 1 .
11. The tire tread composition of claim 10 , wherein the filler is a silica-based filler.
12. The tire tread composition of claim 10 , wherein the filler is a carbon black filler.
13. The tire tread composition of claim 10 , wherein the filler is blend of silica-based filler and a carbon black filler.
14. The tire tread composition of claim 10 , wherein the diene elastomer is a styrenic copolymer, a polybutadiene, natural rubber, a polyisoprene, a butadiene copolymer, an isoprene copolymer or blends thereof.
15. A propylene-ethylene-diene terpolymer comprising from 2% to 25% by weight of ethylene, from 98% to 75% by weight propylene and from 1% to 21% by weight of a diene, wherein the terpolymer has a crystallinity of less than 3%, a melt flow rate (MFR) of less than 10 g/10 min, and a Tg by DSC of from −2° C. to −25° C., wherein the terpolymer does not comprise isotactic polypropylene sequences, and wherein the terpolymer has a g′ index value of 0.95 or greater.
16. The propylene-ethylene-diene terpolymer of claim 15 , wherein the percentage ethylene is from 4 percent to 20 percent.
17. The propylene-ethylene-diene terpolymer of claim 15 , wherein the percentage propylene is from 80 percent to 96 percent.
18. The propylene-ethylene-diene terpolymer of claim 15 , wherein the diene comprises 5-ethylidene-2-norbornene (ENB), 1,4-hexadiene; 5-methylene-2norbornene (MNB), 1,6-octadiene, 5-methyl-1,4-hexadiene, 3,7-dimethyl-1,6-octadiene, 1,3-cyclopentadiene, 1,4-cyclohexadiene or mixtures thereof.
19. The propylene-ethylene-diene terpolymer of claim 18 , wherein the diene is 5-ethylidene-2-norbornene.
20. The propylene-ethylene-diene terpolymer of claim 15 , wherein the Tg is from −4° C. to −25° C.
21. The propylene-ethylene-diene terpolymer of claim 15 , wherein the MFR is from 0.1 to 5 g/10 min.
22. The propylene-ethylene-diene terpolymer of claim 15 , wherein the crystallinity is less than 2%.
23. The propylene-ethylene-diene terpolymer of claim 22 , wherein the crystallinity is less than 1%.