Rubber composition and vibration damper using the rubber composition
AssigneeThe Gates Corporation
InventorsPaul N. Dunlap, Bobbie E. South
Life of this patent
Estimating the term…
Abstract
A torsional vibration damper or other vibration damping device with a rubber vibration absorbing element. The rubber element is a peroxide-cured composition comprising 100 parts of ethylene-alpha-olefin elastomer, and 20 to 100 parts of substantially isobutylene or butene polymer having a viscosity average molecular weight greater than about 5000. The polymer may also be a copolymer of isobutylene and isoprene. The addition of the isobutylene polymer to the ethylene-alpha-olefin elastomer composition increases the vibration damping character of the rubber.
Claims14
A vibration absorbing device comprising a rubber vibration absorbing element, said rubber element comprising:
- 100 parts of ethylene-alpha-olefin elastomer, and 20 to 100 parts of substantially isobutylene or butene polymer having a viscosity average molecular weight in the range from about 50,000 to about 1,250,000 and having less than about 1 mole per cent unsaturation.
A torsional vibration damper comprising a free-radical-cured rubber vibration absorbing element, wherein said rubber element comprises:
- 100 parts of ethylene-alpha-olefin elastomer;
- and 20 to 100 parts of one or more polymers having a viscosity average molecular weight in the range from about 50,000 to about 1,250,000 selected from the group consisting of polybutylene, polyisobutylene, polybutene;
- and polyisobutylene-co-isoprene having less than about 1 mole per cent isoprene.
A cured rubber composition comprising:
- 100 parts of ethylene-alpha-olefin elastomer;
- and an amount of substantially isobutylene or butene polymer having a viscosity average molecular weight above about 50,000 effective for substantially increasing the vibration damping character of the composition as indicated by an increase in tan δ of at least about 100 percent at 120° C.
An article selected from the group consisting of a belt, a hose and a vibration control device;
- comprising:
- molded or extrusion-formed, free-radical-cured, ethylene-alpha-olefin rubber, said rubber comprising:
- substantially isobutylene or butene polymer having less than about 1 mole per cent isoprene and having a viscosity average molecular weight greater than about 50,000 in an amount effective for at least doubling the damping character of the rubber as indicated by measurement of tan δ at 120° C.
Dependencies are inferred from the claim text.