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US 12,584,009 B2Granted
Rubber composition for transmission belt and transmission belt
AssigneeMitsuboshi Belting Ltd.
InventorToshiki Ozaki
Life of this patent
Estimating the term…
Abstract
A rubber composition for a power-transmission belt includes: a polymer component including an ethylene-α-olefin elastomer; carbon black; and clay, in which the ethylene-α-olefin elastomer has a Mooney viscosity at 125° C. of 25 ML (1+4) 125° C. or less, the clay has a pH of 5.5 or higher, a total amount of the carbon black and the clay is 80 parts by mass to 180 parts by mass with respect to 100 parts by mass of the polymer component, and a mass ratio of the carbon black to the clay is clay/carbon black=0.2/1 to 1.2/1.
Claims8
A rubber composition for a power-transmission belt, the composition comprising:
- a polymer component comprising an ethylene-α-olefin elastomer;
- carbon black;
- clay;
- and
- a short fiber, wherein
- the ethylene-α-olefin elastomer has a Mooney viscosity at 125° C. of 25 ML (1+4) 125° C. or less,
- the clay has a pH of 5.5 or higher,
- a total amount of the carbon black and the clay is 80 parts by mass to 180 parts by mass with respect to 100 parts by mass of the polymer component,
- a mass ratio of the carbon black to the clay is clay/carbon black=0.2/1 to 1.2/1,
- a proportion of the short fiber is 5 parts by mass to 100 parts by mass with respect to 100 parts by mass of the polymer component,
- a crosslinked product of the rubber composition has an 8% bending stress in a short fiber orthogonal direction of 6 MPa to 8 MPa, and
- the crosslinked product of the rubber composition has an 8% bending stress in a short fiber parallel direction of 2 MPa to 3 MPa.
9 more elements
Dependencies are inferred from the claim text.