US2013123387A1PendingUtilityA1

Rubber composition for undertread, and pneumatic tire

56
Assignee: SUMITOMO RUBBER INDPriority: Nov 11, 2011Filed: Nov 9, 2012Published: May 16, 2013
Est. expiryNov 11, 2031(~5.3 yrs left)· nominal 20-yr term from priority
Inventors:Yoshihiro KagawaNaoya Ichikawa
C08L 7/00C08K 3/013C08C 1/04C08L 15/00B60C 1/0016C08L 7/02C08L 65/02Y02T10/86
56
PatentIndex Score
0
Cited by
0
References
0
Claims

Abstract

The present invention provides a rubber composition for an undertread, which has improved in processability, fuel economy, and tensile properties in a balanced manner, and also provides a pneumatic tire formed from the rubber composition. The present invention relates to a rubber composition for an undertread, including: a rubber component containing a modified natural rubber having a phosphorus content of 200 ppm or less; and carbon black and/or a white filler, wherein the modified natural rubber is contained in an amount of 5% by mass or more per 100% by mass of the rubber component.

Claims

exact text as granted — not AI-modified
1 . A rubber composition for an undertread, comprising:
 a rubber component containing a modified natural rubber having a phosphorus content of 200 ppm or less; and   at least one of carbon black and a white filler,   wherein the modified natural rubber is contained in an amount of 5% by mass or more per 100% by mass of the rubber component.   
     
     
         2 . The rubber composition for an undertread according to  claim 1 ,
 wherein the modified natural rubber has a nitrogen content of 0.3% by mass or less and has a gel content determined as a toluene-insoluble fraction of 20% by mass or less.   
     
     
         3 . The rubber composition for an undertread according to  claim 1 ,
 wherein the modified natural rubber is obtained by saponifying natural rubber latex.   
     
     
         4 . The rubber composition for an undertread according to  claim 1 ,
 wherein the modified natural rubber is obtained by the steps of: (A) saponifying natural rubber latex to prepare a saponified natural rubber latex; (B) coagulating the saponified natural rubber latex and treating the resulting coagulated rubber with alkali; and (C) washing the resulting rubber until the phosphorus content in rubber falls to 200 ppm or less.   
     
     
         5 . The rubber composition for an undertread according to  claim 1 ,
 wherein the white filler is silica.   
     
     
         6 . A pneumatic tire, comprising an undertread formed from the rubber composition according to  claim 1 .

Join the waitlist — get patent alerts

Track US2013123387A1 — get alerts on status changes and closely related new filings.

We store only your email — no account needed. See our privacy policy.