Low ethylene amorphous propylene-ethylene-diene terpolymer compositions

Patent metadata

Field	Value
Publication number	US-10336845-B2
Application number	US-201515503146-A
Country	US
Kind code	B2
Filing date	Aug 31, 2015
Priority date	Sep 30, 2014
Publication date	Jul 2, 2019
Grant date	Jul 2, 2019

Abstract

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.

First claim

The invention claimed is:

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%.

Assignees

• Exxonmobil Chemical Patents Inc

Inventors

• Tsou Andy H
• Blok Edward J
• Kiss Gabor
• Shah Rhutesh K

Classifications

• C08L7/00

  Compositions of natural rubber · CPC title

• C08F290/042

  Polymers of hydrocarbons as defined in group C08F10/00 · CPC title

• C08F4/65908

  in combination with an ionising compound other than alumoxane, e.g. (C6F5)4B-X+ · CPC title

• B60C1/0016

  Compositions of the tread · CPC title

• C08L9/00 Primary

  Compositions of homopolymers or copolymers of conjugated diene hydrocarbons · CPC title