Runflat tire

• US 7,789,119 B2
• Filed: 07/25/2007
• Issued: 09/07/2010
• Est. Priority Date: 10/10/2006
• Status: Expired due to Fees

• Current Assignee: Goodyear Tire & Rubber Company
• Original Assignee: Goodyear Tire & Rubber Company
• Inventors: Diaz-Scharfe, Mercedes Maria, Kaes, Christian, Gregorius, Leon Jean Mathias, Weydert, Marc, Agostini, Giorgio, Corvasce, Filomeno Gennaro, Schmitz, Frank, Peronnet-Paquin, Anne Therese
• Primary Examiner(s): Fischer; Justin
• Application Number:
  US11/881,038
• Publication Number:
  US 20080178981A1
• Time in Patent Office: 1,140 Days
• Field of Search: 152/520
• US Class Current: 152/516
• CPC Class Codes: B60C 17/00 Tyres characterised by means enabling restricted operation in damaged or deflated condition; Accessories therefor
• 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: C08K 5/3415 Five-membered rings
• CPC Class Codes: C08K 5/39 Thiocarbamic acids; Derivatives thereof, e.g. dithiocarbamates
• CPC Class Codes: C08L 2666/02 Organic macromolecular compounds, natural resins, waxes or and bituminous materials
• CPC Class Codes: C08L 2666/08 Homopolymers or copolymers according to C08L7/00 - C08L21/00; Derivatives thereof
• CPC Class Codes: C08L 7/00 Compositions of natural rubber
• CPC Class Codes: C08L 9/00 Compositions of homopolymers or copolymers of conjugated diene hydrocarbons

Abstract

A pneumatic runflat tire including at least one sidewall insert, the at least one sidewall insert including a heterogenous rubber compound comprising first rubber and second rubber composition phases, wherein the second rubber phase is further vulcanizable.

Claims

1. A pneumatic runflat tire comprising at least one sidewall insert, the at least one sidewall insert comprising a heterogenous rubber compound comprising first rubber and second rubber composition phases, wherein the second rubber phase is further vulcanizable;

wherein

the first rubber composition comprises 100 parts by weight of an elastomer comprising from 70 to 90 parts by weight of natural rubber or synthetic polyisoprene, and from 10 to 30 parts by weight of cis-1,4-polybutadiene; and

the second rubber composition comprises 100 parts by weight of natural rubber or synthetic polyisoprene, and from 2 to 8 parts by weight of 1,3-bis(citraconimidomethyl)benzene.

2. The pneumatic runflat tire of claim 1, wherein the weight ratio of 1,3-bis(citraconimidomethyl)benzene in the first rubber composition to 1,3-bis(citraconimidomethyl)benzene in the second rubber composition is less than 1:

1.

3. The pneumatic runflat tire of claim 1, wherein the heterogenous rubber compound comprises at least part of the first rubber composition phase as a continuous phase and at least part of the second rubber composition phase as a disperse phase dispersed in the at least part of the first rubber composition phase.

5. The pneumatic runflat tire of claim 2, wherein the weight ratio of 1,3-bis(citraconimidomethyl)benzene in the first rubber composition to 1,3-bis(citraconimidomethyl)benzene in the second rubber composition is less than 1:

1.

4. A pneumatic runflat tire comprising at least one sidewall insert, the at least one sidewall insert comprising a heterogenous rubber compound comprising first rubber and second rubber composition phases, wherein the vulcanization state of the second rubber phase is between its T₂₀ and T₈₀ vulcanization states;

wherein

the first rubber composition comprises from 70 to 90 parts by weight of natural rubber or synthetic polyisoprene; and

from 10 to 30 parts by weight of cis-1,4-polybutadiene; and

the second rubber composition comprises 100 parts by weight of natural rubber or synthetic polyisoprene and from 2 to 8 parts by weight of 1,3-bis(citraconimidomethyl)benzene.

6. A pneumatic runflat tire comprising at least one sidewall insert, the at least one sidewall insert comprising a heterogenous rubber compound comprising first rubber and second rubber composition phases, wherein the second rubber composition has a first modulus and a second modulus, the first modulus existing after a cure cycle of the tire, and the second modulus obtainable during a runflat condition of the tire, wherein the second modulus is greater than the first modulus, and the modulus of the first rubber composition is greater than the first modulus of the second rubber composition;

wherein

the first rubber composition comprises from 70 to 90 parts by weight of natural rubber or synthetic polyisoprene; and

from 10 to 30 parts by weight of cis-1,4-polybutadiene; and

the second rubber composition comprises 100 parts by weight of natural rubber or synthetic polyisoprene and from 2 to 8 parts by weight of 1,3-bis(citraconimidomethyl)benzene.

7. The pneumatic runflat tire of claim 6, wherein the weight ratio of 1,3-bis(citraconimidomethyl)benzene in the first rubber composition to 1,3-bis(citraconimidomethyl)benzene in the second rubber composition is less than 1:

1.