Power transmission belt
A power transmission belt having a body with an inside, an outside, and laterally oppositely facing side surfaces. The body has at least one surface that engages a pulley to frictionally transmit forces between the power transmission belt and pulley. The body includes rubber defining at least a part of the at least one surface. The rubber is a composition made up of a blend of at least: a) 100 parts by weight of an ethylene/α-olefin elastomer; b) 10 to 25 parts by weight of a 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.
1. 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.
2. The power transmission belt according to claim 1 wherein the inorganic filler comprises at least one of metal carbonate and metal silicate.
3. The power transmission belt according to claim 1 wherein the rubber composition comprises a second plasticizer having a solubility parameter of from 6.0 to 8.1(cal/cm 3 ) 1/2 .
4. The power transmission belt according to claim 2 wherein the rubber composition comprises a second plasticizer having a solubility parameter of from 6.0 to 8.1(cal/cm 3 ) 1/2 .
5. The power transmission belt according to claim 3 , wherein the second plasticizer having a solubility parameter of from 6.0 to 8.1(cal/cm 3 ) 1/2 comprises a petroleum plasticizer.
6. The power transmission belt according to claim 4 , wherein the second plasticizer having a solubility parameter of from 6.0 to 8.1(cal/cm 3 ) 1/2 comprises a petroleum plasticizer.
7. The power transmission belt according to claim 5 , wherein the petroleum plasticizer comprises at least one of a paraffin plasticizer and a naphthene plasticizer.
8. The power transmission belt according to claim 6 , wherein the petroleum plasticizer comprises at least one of a paraffin plasticizer and a naphthene plasticizer.
9. The power transmission belt according to claim 7 wherein the rubber composition comprises a blend of 100 parts by weight of the ethylene/α-olefin elastomer and from 3 to 20 parts by weight of the at least one of the paraffin plasticizer and naphthene plasticizer.
10. The power transmission belt according to claim 8 wherein the rubber composition comprises a blend of 100 parts by weight of the ethylene/α-olefin elastomer and from 3 to 20 parts by weight of the at least one of the paraffin plasticizer and naphthene plasticizer.
11. The power transmission belt according to claim 1 wherein the first plasticizer having a solubility parameter of from 8.3 to 10.7 (cal/cm 3 ) 1/2 is an ether ester plasticizer.
12. The power transmission belt according to claim 2 wherein the first plasticizer having a solubility parameter of from 8.3 to 10.7 (cal/cm 3 ) 1/2 is an ether ester plasticizer.
13. The power transmission belt according to claim 3 wherein the first plasticizer having a solubility parameter of from 8.3 to 10.7 (cal/cm 3 ) 1/2 is an ether ester plasticizer.
14. The power transmission belt according to claim 5 wherein the first plasticizer having a solubility parameter of from 8.3 to 10.7 (cal/cm 3 ) 1/2 is an ether ester plasticizer.
15. The power transmission belt according to claim 7 wherein the first plasticizer having a solubility parameter of from 8.3 to 10.7 (cal/cm 3 ) 1/2 is an ether ester plasticizer.
16. The power transmission belt according to claim 9 wherein the first plasticizer having a solubility parameter of from 8.3 to 10.7 (cal/cm 3 ) 1/2 is an ether ester plasticizer.
17. The power transmission belt according to claim 1 wherein the power transmission belt is one of a V-belt and a V-ribbed belt.
18. The power transmission belt according to claim 1 wherein the power transmission belt is a non-toothed belt.