US 5,571,883 A · Elastomeric vehicle vibration damping devices

Abstract

Motor vehicle vibration damping parts based on an ethylene, alpha-olefin, vinyl norbornene elastomeric polymer are manufactured with more efficiency due to vibration damping part compounds having lower viscosity, easier processing than ethylene, alpha-olefins, diene monomer compounds, where the diene monomer is other than vinyl norbornene. Additionally, the engine mounts or other vibration damping parts based on the ethylene, alpha-olefin, vinyl norbornene elastomeric polymer have better heat aging characteristics than natural rubber, when temperature of service exceed 120.degree. C., maintain more constant dynamic characteristics of the mount when running at elevated temperature like 120.degree. C. Finally the engine mounts or other vibration damping parts based on the ethylene, alpha-olefin, vinyl norbornene elastomeric polymer can be manufactured with compound containing less peroxide as curing agent, than ethylene, alpha-olefins, diene monomer compounds, where the diene monomer is other than vinyl norbornene. Those engine mounts or other vibration damping parts based on the ethylene, alpha-olefin, vinyl norbornene elastomeric polymer provide better aging properties so the service life of the parts are greatly extended vs. natural rubber part.

Claims10

Dependent claims

A vehicle part comprising an ethylene, .alpha.-olefin, vinyl norbornene elastomeric polymer;

wherein said elastomeric polymer:
a) includes ethylene in the range of from about 40 to about 90 mole %;
b) includes vinyl norbornene in the range of from about 0.2 to about 5.0 mole %;
c) has a branching index in the range of from about 0.1 to about 0.6;
and
d) has a Mooney viscosity ML (1+4), 125.degree. C. from about 80 to MST (5+4),200.degree. C. up to 90;
wherein a compound including said ethylene, .alpha.-olefin, vinyl norbornene elastomeric polymer has:
i) ML 1+100.degree. C. up to about 80;
ii) MH-ML above about 50 daN.m;
iii) cure rate of at least about 15 daN.m/min.;
iv) 100% modulus of up about 3 MPa;
v) compression set 22H/125.degree. C. / 25% deflection up to about 20%;
vi) compression set 22H/150.degree. C./25% deflection up to about 25%;
vii) loss tangent below about 0.2 at +26.degree. C.;
viii) loss tangent below about 0.2 at +80.degree. C.;
ix) loss tangent below about 0.2 at +125.degree. C.;
x) a glass transition temperature of about -40.degree. C. measured by DMTA (Dynamic-mechanical-thermal analyser) machine@1 Hz.

14 more elements

Dependencies are inferred from the claim text.

Elastomeric vehicle vibration damping devices

Life of this patent

Elastomeric vehicle vibration damping devices

Life of this patent

Abstract

Claims10