Elastomeric formulations comprising branched EPDM polymers
A compound suitable for use in producing articles including foamed articles can include 100 parts per hundred rubber (phr) of a branched ethylene propylene diene monomer (EPDM) elastomer comprising 35 wt % to 70 wt % ethylene derived units, 20 wt % to 64 wt % propylene derived units, and 1 wt % to 10 wt % diene derived units, wherein the EPDM elastomer has a Mooney viscosity (ML) (1+4) at 125° C. of 30 MU to 120 MU, a corrected Mooney relaxation area (cMLRA) at 80 ML of 300 MU·sec to 1000 MU·sec, and long chain branching (LCB) g′ (vis) of 0.80 to 1.0; 75 phr to 200 phr of a filler; 25 phr to 125 phr of a processing oil; 5 phr to 50 phr of a curative, and optionally 0.1 phr to 25 phr of a foaming agent.
1. A compound comprising:
100 parts per hundred rubber (phr) of a branched ethylene propylene diene monomer (EPDM) elastomer comprising 35 wt % to 70 wt % ethylene derived units, 20 wt % to 64 wt % propylene derived units, and 1 wt % to 10 wt % diene derived units, wherein the EPDM elastomer has a Mooney viscosity (ML) (1+4) at 125° C. of 30 MU to 120 MU, a corrected Mooney relaxation area (cMLRA) at 80 ML of 300 MU·sec to 1000 MU·sec, and long chain branching (LCB) g′ (vis) of 0.80 to 1.0;
75 phr to 200 phr of a filler;
25 phr to 125 phr of a processing oil; and
5 phr to 50 phr of a curative;
wherein the branched EPDM has a number average molecular weight (Mn) of 35,000 g/mol to 125,000 g/mol.
2. The compound of claim 1 , wherein the branched EPDM has a weight average molecular weight (Mw) of 215,000 g/mol to 350,000 g/mol.
3. The compound of claim 1 , wherein the branched EPDM has a z-average molecular weight (Mz) of 375,000 g/mol to 1,000,000 g/mol.
4. The compound claim 1 , wherein the branched EPDM has a Mw/Mn of 2.25 to 4.5.
5. The compound of claim 1 , wherein the branched EPDM has a Mz/Mn of 5.0 to 12.5.
6. The compound of claim 1 , wherein the compound has a Mooney ratio of 0.8 to 1.0.
7. The compound of claim 1 further comprising: 0.1 phr to 25 phr of a foaming agent.
8. A method comprising:
producing a compound comprising:
100 parts per hundred rubber (phr) of a branched ethylene propylene diene monomer (EPDM) elastomer comprising 35 wt % to 70 wt % ethylene derived units, 20 wt % to 64 wt % propylene derived units, and 1 wt % to 10 wt % diene derived units, wherein the EPDM elastomer has a Mooney viscosity (ML) (1+4) at 125° C. of 30 MU to 120 MU, a corrected Mooney relaxation area (cMLRA) at 80 ML of 300 MU·sec to 1000 MU·sec, and long chain branching (LCB) g′ (vis) of 0.80 to 1.0;
75 phr to 200 phr of a filler;
25 phr to 125 phr of a processing oil; and
5 phr to 50 phr of a curative; and
vulcanizing the compound;
wherein the branched EPDM has a number average molecular weight (Mn) of 35,000 g/mol to 125,000 g/mol.
9. The method of claim 8 , wherein the branched EPDM has a weight average molecular weight (Mw) of 215,000 g/mol to 350,000 g/mol.
10. The method of claim 8 , wherein the branched EPDM has a z-average molecular weight (Mz) of 375,000 g/mol to 1,000,000 g/mol.
11. The method of claim 8 , wherein the branched EPDM has a Mw/Mn of 2.25 to 4.5.
12. The method of claim 8 , wherein the branched EPDM has a Mz/Mn of 5.0 to 12.5.
13. The method of claim 8 , wherein the compound has a Mooney ratio of 0.8 to 1.0.
14. The method of claim 8 , wherein the compound further comprises 0.1 phr to 25 phr of a foaming agent, and wherein the method further comprises foaming the compound.
15. The method of claim 8 further comprising: extruding the compound and forming an article.
16. The method of claim 15 , wherein the article is an automotive weather seal, a non-automotive weather seal, or a building profile.
17. The method of claim 8 further comprising: molding the compound and forming an article.
18. The method of claim 17 , wherein the article is a seal, a gasket, a hose, a roof sheet, a film, or a cable jacket.
19. A method comprising:
polymerizing ethylene monomers, propylene monomers, and diene monomers in the presence of 2-(8-anilino-5,6,7,8-tetrahydronaphthalen-1-yl)-N-(2,6-diisopropylphenyl) quinolin-8-amido hafnium dimethyl and dimethylanilinium tetrakis(pentafluorophenyl)borane to produce a branched ethylene propylene diene monomer (EPDM) elastomer comprising 35 wt % to 70 wt % ethylene derived units, 20 wt % to 64 wt % propylene derived units, and 1 wt % to 10 wt % diene derived units, wherein the EPDM elastomer has a Mooney viscosity (ML) (1+4) at 125° C. of 30 MU to 120 MU, a corrected Mooney relaxation area (cMLRA) at 80 ML of 300 MU·sec to 1000 MU·sec, and long chain branching (LCB) g′ (vis) of 0.80 to 1.0.