Friction transmission belt
A frictional power transmission belt includes a compression rubber layer that includes a frictional power transmission surface at least a part of which can come into contact with a pulley and that is formed of a cured product of a rubber composition. On a surface of the frictional power transmission surface, a surface layer comprising a cured product of a rubber composition containing a polyvinyl pyrrolidone-based resin and an elastomer component is laminated.
1. A frictional power transmission belt comprising:
a compression rubber layer that comprises a frictional power transmission surface at least a part of which can come into contact with a pulley and that is formed of a cured product of a rubber composition, and
a surface layer comprising a cured product of a rubber composition comprising a polyvinyl pyrrolidone-based resin and an elastomer component, wherein the surface layer is laminated on a surface of the frictional power transmission surface of the compression rubber layer and is configured to come into contact with the pulley.
2. The frictional power transmission belt according to claim 1 , wherein the surface layer further comprises a fabric.
3. The frictional power transmission belt according to claim 1 , wherein the elastomer component comprises an ethylene-α-olefin elastomer.
4. The frictional power transmission belt according to claim 1 , wherein the polyvinyl pyrrolidone-based resin has a K value of 10 to 100.
5. The frictional power transmission belt according to claim 1 , wherein a proportion of the polyvinyl pyrrolidone-based resin is 1 to 20 parts by mass with respect to 100 parts by mass of the elastomer component.
6. The frictional power transmission belt according to claim 1 , wherein the rubber composition for forming the surface layer does not comprise a binder resin.
7. The frictional power transmission belt according to claim 1 , wherein the rubber composition for forming the compression rubber layer does not comprise a polyvinyl pyrrolidone-based resin.
8. The frictional power transmission belt according to claim 1 , wherein the frictional power transmission belt is a V-ribbed belt or a raw edge V-belt, and
wherein the compression rubber layer includes one or more grooves.