Reinforcing Sheet for Reinforcing Toothed Belt,and Toothed Belt and Method for Production Thereof

A method of manufacturing a toothed belt having a belt part and a tooth part sticking out of the belt part, comprising:

• a first step of forming a reinforcing-sheet including a fiber sheet and a coating film formed on the fiber sheet by drying the fiber sheet on which an aqueous treatment agent containing a first rubber latex and a first vulcanizing agent is applied;
• and
• a second step of reinforcing a surface of the tooth part with the reinforcing-sheet by vulcanizing the first rubber and a second rubber at the same time while adhering a rubber composition, which is a material for the tooth part, including the second rubber and a second vulcanizing agent to the reinforcing-sheet,
• wherein the aqueous treatment agent contains the first vulcanizing agent in the range of 30 parts by weight to 75 parts by weight for 100 parts by weight of the first rubber, and
• the first vulcanizing agent is at least one vulcanizing agent selected from a group consisting of a maleimide vulcanizing agent, organic diisocyanate and an aromatic nitroso-compound.