Rubber composition for pneumatic tires

Patent metadata

Field	Value
Publication number	US-10494459-B2
Application number	US-201515516634-A
Country	US
Kind code	B2
Filing date	Oct 16, 2015
Priority date	Oct 17, 2014
Publication date	Dec 3, 2019
Grant date	Dec 3, 2019

Abstract

Provided are a rubber composition for pneumatic tires with excellent fluidity and excellent degradation resistance, and a pneumatic tire formed from the rubber composition. The present invention relates to a rubber composition for pneumatic tires containing a rubber component including a halogenated butyl rubber, and an organic peroxide.

First claim

The invention claimed is:

1. A pneumatic tire which includes a sealant layer located radially inside an innerliner of the pneumatic tire,
the sealant layer being formed of a generally string-shaped sealant provided continuously and spirally along an inner periphery of the pneumatic tire,
the generally string-shaped sealant provided continuously and spirally along the inner periphery of the pneumatic tire being attached without overlapping in the width direction and without gaps,
the generally string-shaped sealant layer being formed only by the sealant,

wherein the generally string-shaped sealant comprises:
a rubber component including a halogenated butyl rubber; and
an organic peroxide, and

wherein the generally string-shaped sealant has a viscosity at 40° C. of 3,000 to 70,000 Pa·s.

2. The pneumatic tire according to claim 1 , wherein the hydrogenated butyl rubber is present in an amount of 80% by mass or more based on 100% by mass of the rubber component.

3. The pneumatic tire according to claim 1 , wherein the generally string-shaped sealant comprises, relative to 100 parts by mass of the rubber component, 1 to 40 parts by mass of the organic peroxide and 1 to 40 parts by mass of a crosslinking activator.

4. The pneumatic tire according to claim 3 , wherein the crosslinking activator is a quinone dioxime compound.

5. The pneumatic tire according to claim 1 , wherein the halogenated butyl rubber is brominated butyl rubber.

6. The pneumatic tire according to claim 1 , wherein the generally string-shaped sealant comprises 100 to 400 parts by mass of a liquid polymer relative to 100 parts by mass of the rubber component.

7. The pneumatic tire according to claim 6 , wherein the liquid polymer is liquid polybutene.

8. The pneumatic tire according to claim 2 , wherein the generally string-shaped sealant comprises, relative to 100 parts by mass of the rubber component, 1 to 40 parts by mass of the organic peroxide and 1 to 40 parts by mass of a crosslinking activator.

9. The pneumatic tire according to claim 8 , wherein the generally string-shaped sealant comprises 100 to 400 parts by mass of a liquid polymer relative to 100 parts by mass of the rubber component.

10. The pneumatic tire according to claim 1 , wherein the sealant layer width in an axial direction of the tire comprises 80% or more of the tire tread contact width.

11. The pneumatic tire according to claim 9 , wherein the sealant layer width in an axial direction of the tire comprises 80% or more of the tire tread contact width.

12. The pneumatic tire according to claim 1 , wherein a number of turns of the generally string-shaped sealant around the inner periphery of the tire is 20 to 70.

13. The pneumatic tire according to claim 1 , wherein the width of the generally string-shaped sealant is 0.8 to 18 mm.

14. The pneumatic tire according to claim 1 , wherein the ratio of the thickness of the generally string-shaped sealant to the width of the generally string-shaped sealant [(thickness of the generally string-shaped sealant)/(width of the generally string-shaped sealant)] is 0.6 to 1.4.

15. The pneumatic tire according to claim 1 , wherein the cross-sectional area of the generally string-shaped sealant is 0.8 to 180 mm 2 .

Assignees

• Sumitomo Rubber Ind

Inventors

• Sugimoto Mutsuki
• Yukawa Naoki
• Yamada Satoshi

Classifications

• B60C19/122

  disposed inside of the inner liner · CPC title

• C08F2810/20

  leading to a crosslinking, either explicitly or inherently · CPC title

• B29D2030/0694

  the sealant being in the form of one or more narrow strips, e.g. applied by winding into the interior of the tyre · CPC title

• C08K5/33

  Oximes · CPC title

• C08K5/14

  Peroxides · CPC title