Tire with sidewall insert

• US 20080083479A1
• Filed: 07/27/2007
• Published: 04/10/2008
• Est. Priority Date: 10/10/2006
• Status: Active Grant

• Current Assignee: Goodyear Tire & Rubber Company
• Original Assignee: Goodyear Tire & Rubber Company
• Inventors: Weydert, Marc, Agostini, Giorgio, Corvasce, Filomeno Gennaro, Schmitz, Frank, Kaes, Christian
• Granted Patent: US 7,694,708 B2
• Time in Patent Office: Days
• US Class Current: 152/517
• CPC Class Codes: B60C 15/0607 comprising several parts, e.g. made of different rubbers
• CPC Class Codes: B60C 17/0009 comprising sidewall rubber inserts, e.g. crescent shaped inserts
• CPC Class Codes: B60C 17/0027 comprising portions of different rubbers in a single insert
• CPC Class Codes: B60C 2001/0033 Compositions of the sidewall inserts, e.g. for runflat
• CPC Class Codes: Y10T 152/10495 Pneumatic tire or inner tube
• CPC Class Codes: Y10T 152/10819 Characterized by the structure of the bead portion of the tire
• CPC Class Codes: Y10T 152/10864 Sidewall stiffening or reinforcing means other than main carcass plies or foldups thereof about beads

Abstract

A pneumatic tire including a circumferential tread, two spaced apart beads, and sidewalls connecting said beads and tread, wherein said tire sidewall contains at least one internal annular sidewall insert including at least two annular segments, the at least two annular segments including first and second adjacent annular segments;

• • wherein said first and second annular segments are disposed with an interface therebetween;
  • wherein each of the at least two annular segments includes a rubber composition comprising at least one diene based rubber and at least one vulcanization modifier selected from the group consisting of α,ω-bis(N,N′-dihydrocarbylthiocarbamamoyldithio)alkanes, bismaleimides, and biscitraconimides; and
  • wherein the concentration of vulcanization modifier in the first annular segment is less than the concentration of vulcanization modifier in the second annular segment.

Claims

1. A pneumatic tire comprised of a circumferential tread, two spaced apart beads, and sidewalls connecting said beads and tread, wherein said tire sidewall contains at least one internal annular sidewall insert comprising at least two annular segments, the at least two annular segments comprising first and second adjacent annular segments;

wherein said first and second annular segments are disposed with an interface therebetween;

wherein each of the at least two annular segments comprises a rubber composition comprising at least one diene based rubber and at least one vulcanization modifier selected from the group consisting of α

,ω

-bis(N,N′

-dihydrocarbylthiocarbamamoyldithio)alkanes, bismaleimides, and biscitraconimides; and

wherein the concentration of vulcanization modifier in the first annular segment is less than the concentration of vulcanization modifier in the second annular segment.

2. The pneumatic tire of claim 1, wherein the sidewall insert is an apex extending from a bead radially outward into the tire sidewall, wherein the first annular segment is disposed radially proximate to the bead and the second annular segment is disposed radially distal to the bead.

3. The pneumatic tire of claim 1, wherein the sidewall insert is a runflat insert spaced radially apart from an apex.

4. The pneumatic tire of claim 3, wherein the first annular segment is disposed axially outward of the second annular segment.

5. The pneumatic tire of claim 3, wherein the first annular segment is disposed axially inward of the second annular segment.

6. The pneumatic tire of claim 3, wherein the first annular segment is disposed radially proximate to the apex, and the second annular segment is disposed radially distal to the apex.

7. The pneumatic tire of claim 3, wherein the first annular segment is disposed radially distal to the apex, and the second annular segment is disposed radially proximate to the apex.

8. The pneumatic tire of claim 1, wherein the amount of vulcanization modifier ranges from about 0 to about 15 parts by weight, per 100 parts by weight of elastomer.

9. The pneumatic tire of claim 8, wherein the vulcanization modifier is 1,3-bis(citraconimidomethyl)benzene.

10. The pneumatic tire of claim 9, wherein the weight ratio of 1,3-bis(citraconimidomethyl)benzene in the first segment to 1,3-bis(citraconimidomethyl)benzene in the second segment is less than 0.9.

11. The pneumatic tire of claim 9, wherein the weight ratio of 1,3-bis(citraconimidomethyl)benzene in the first segment to 1,3-bis(citraconimidomethyl)benzene in the second segment is less than 0.8.

12. The pneumatic tire of claim 9, wherein the weight ratio of 1,3-bis(citraconimidomethyl)benzene in the first segment to 1,3-bis(citraconimidomethyl)benzene in the second segment is less than 0.7.

13. The pneumatic tire of claim 10, wherein the amount of 1,3-bis(citraconimidomethyl)benzene in the first segment ranges from 0 to 5 phr and the amount of 1,3-bis(citraconimidomethyl)benzene in the second segment ranges from 1 to 15 phr.

14. The pneumatic tire of claim 11, wherein the amount of 1,3-bis(citraconimidomethyl)benzene in the first segment ranges from 0 to 5 phr and the amount of 1,3-bis(citraconimidomethyl)benzene in the second segment ranges from 1 to 15 phr.

15. The pneumatic tire of claim 12, wherein the amount of 1,3-bis(citraconimidomethyl)benzene in the first segment ranges from 0 to 5 phr and the amount of 1,3-bis(citraconimidomethyl)benzene in the second segment ranges from 1 to 15 phr.

16. The pneumatic tire of claim 1, wherein the rubber compositions each comprise at least one elastomer selected from the group consisting of emulsion polymerized styrene/butadiene copolymers, solution polymerized styrene/butadiene copolymers, natural rubber, c is 1,4-polybutadiene, synthetic c is 1,4-polyisoprene, styrene/isoprene copolymers, 3,4-polyisoprene, isoprene/butadiene copolymers, medium vinyl polybutadiene (20 percent to 60 percent by weight of vinyl units), styrene/isoprene/butadiene terpolymers, butyl rubber, polychloroprene, acrylonitrile/butadiene copolymers and ethylene/propylene/diene terpolymers.

17. The pneumatic tire of claim 3, wherein the at least two co-annular segments further comprises a third annular segment.

18. The pneumatic tire of claim 17, where the third annular segment is disposed axially outward of the first and second annular segments.

19. The pneumatic tire of claim 17, wherein the third annular segment is disposed radially distal to the first and second annular segments.