Patent ID: 9410033
Filing Date: 2016-08-09
CPC Classification: B60C,C08C,C08K,C08L,Y02T

Claim Text:
1. A method for producing a pneumatic tire having an undertread, comprising: step (A) of saponifying natural rubber latex to prepare a saponified natural rubber latex; step (B) of coagulating the saponified natural rubber latex and treating the resulting coagulated rubber with alkali; step (C) of washing the resulting rubber until the phosphorus content in rubber falls to 200 ppm or less to produce a modified natural rubber having a phosphorus content of 200 ppm or less; and step (D) of mixing the modified natural rubber and at least one of the carbon black and white filler to produce a rubber composition; and step (E) of producing the undertread from the rubber composition and producing the pneumatic tire having the undertread, wherein the alkali is at least one selected from the group consisting of potassium carbonate, sodium carbonate, sodium hydrogen carbonate, potassium hydrogen carbonate, lithium carbonate, lithium hydrogen carbonate, and aqueous ammonia.