Patent ID: 7887448

Claim:
A power transmission belt comprising: a body with an inside and outside and laterally oppositely facing side surfaces, the body having at least one surface that engages a pulley comprising at least one surface to frictionally transmit forces between the power transmission belt and pulley, the body comprising rubber defining at least a part of the at least one surface that is a composition comprising a blend of: a) 100 parts by weight of an ethylene/α-olefin elastomer; b) 10 to 25 parts by weight of a first plasticizer having a solubility parameter of from 8.3 to 10.7 (cal/cm 3 ) 1/2 ; and c) 60 to 110 parts by weight of an inorganic filler comprising carbon black, wherein the carbon black has a nitrogen adsorption specific surface area of from 65 to 125 m 2 /g and dibutyl phthalate oil absorption of from 90 to 125 cm 3 /100 g, wherein a friction coefficient between the at least one surface of the power transmission belt and the at least one surface of the pulley for the at least one surface is from 0.3 to 0.6 and said inorganic filler and said first plasticizer promote bleeding of said first plasticizer.