Vehicle parts comprising ethylene/2-olefin/vinylnorbornene elastomeric polymers
AssigneeExxon Chemical Patents Inc.
InventorsEric Paul Jourdain, Periagaram S. Ravishankar
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Abstract
Motor vehicle brake parts based on an ethylene, alpha-olefin, vinyl norbornene elastomeric polymer are manufactured with more efficiency due to brake part compounds having lower viscosity, faster and fuller cures than ethylene, alpha-olefins, diene monomer compounds, where the diene monomer is other than vinyl norbornene. Additionally, the brake parts based on the ethylene, alpha-olefin, vinyl norbornene elastomeric polymer have improved resistance to elevated temperature properties, and good heat aging characteristics, compared to for instance ethylene, alpha-olefin, non-conjugated diene elastomers (where the diene is other than vinyl norbornene) or styrene butadiene rubbers.
Claims11
A vehicle part comprising an ethylene, .alpha.-olefin, vinyl norbornene elastomeric polymer;
- wherein a compound including said elastomeric polymer has:
- a) a ML 1+4 100.degree. C. up to about 80;
- b) a MH-ML (as determined by ODR @ 180.degree. C., .+-.3.degree. arc) of at least about 140 daN.m
- c) a cure rate at least about 70 daN.m/min.
- d) a 100% modulus at least about 5 MPa;
- and
- e) a compression set (22 hrs @ 150.degree. C.) up to about 25%;
- wherein said elastomeric polymer has a M.sub.w /M.sub.n greater than 6.
A vehicle brake part comprising an ethylene, propylene, vinyl norbornene elastomeric polymer wherein;
- a) said ethylene is present in the said elastomeric polymer in the range from about 50 to about 65 mole percent, and vinyl norbornene is present in said polymer in the range from about 0.2 to about 0.8 mole percent, said propylene is present in the range of from about 35 to about 50 mole percent, said mole percents based on the total moles of said elastomeric polymer;
- wherein said elastomeric polymer has a Mw/Mn greater than 6;
- and
- wherein a compound made from said elastomeric polymer
- b) has:
- i) a ML 1+4 100.degree. C. up to about 50;
- ii) a MH-ML of at least about 200 daN.m;
- iii) a cure rate of at least about 100 daN.m/min;
- iv) a 100% modulus at least about 9 MPa;
- and
- v) a compression set (22 hrs @ 150.degree. C.) up to about 10%.
A vehicle comprising a vehicle body and a brake part wherein;
- a) said brake part includes an ethylene, alpha-olefin, vinyl norbornene elastomeric polymer, wherein;
- i) said ethylene is present in said elastomeric polymer in the range of from about 50 to about 65 mole percent;
- ii) said alpha-olefin is present in said elastomeric polymer in the range of from about 35 to about 50 mole percent;
- iii) said vinyl norbornene is present in said elastomeric polymer in the range of from about 0.2 to about 0.8 mole percent;
- said mole percent based on the total moles of said elastomeric polymer;
- wherein said elastomeric polymer has a branching index in the range of from about 0.1 to about 0.6, and a M.sub.w /M.sub.n above about 6.
Dependencies are inferred from the claim text.