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| Structure of pneumatic tire covers |
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| Human body protector |
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| Flexible composites having rigid isolated panels and articles fabricated from same |
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Self-sealing pneumatic tire
| Details |
Inventors: Bohm, Georg G. A.; DeTrano, Mario;
Assignee: The Firestone Tire & Rubber Company (Akron, OH)
Primary Examiner: Kittle; John E.
Assistant Examiner:
Attorney, Agent or Firm:
This disclosure relates to a self-sealing pneumatic tire with puncture sealing properties and a method of manufacturing such a tire. The puncture sealant properties of the self-sealing tire are provided by a layer comprised of a blend of a crosslinked polymeric material and an irradiation degraded polymeric material. The method of this disclosure comprises providing a layer of rubber compound with a blend of polymeric materials, one of which degrades upon exposure to irradiation and another which crosslinks either on exposure to irradiation, by chemical reaction at vulcanization temperature, or both, assembling the layer into an unvulcanized tire in situ with the polymeric materials unaltered, vulcanizing the tire without altering the degradable polymeric material and irradiating the tire whereby the degradable polymeric material is degraded to a low viscosity to form a tacky material and the crosslinkable polymeric material is crosslinked to form an elastic matrix for the degraded polymeric material, whereby the layer has puncture sealing properties. |
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DETAILED DESCRIPTION OF THE INVENTION FIG.
1 is a cross-sectional view of the self-sealing pneumatic tire of this invention manufactured by the method of this invention.
FIG.
2 is a cross-sectional view of a modification of the self-sealing pneumatic tire of this invention manufactured by the method of this invention.
In FIGS.
1 and 2 the tire is shown generally as 10 having tread, 11, sidewalls, 12, beads and 13 and innerliner 14.
The structural features of the tire may be any of the known constructions; that is, radial, bias or belted bias, which are used in the standard manufacture of passenger, truck, airplane, off-the-road, agricultural or industrial tires.
These features do not comprise part of this invention.
In FIG.
1 the sealant layer is shown as 15.
It is located on the inner periphery of the tire in the crown area radially inward of the road-engaging tread surface, 11, and radially inward of innerliner, 14.
The tire as shown in claim 1 is manufactured by the method set out in detail in the "Summary of the Invention" portion of this specification.
FIG.
1 also depicts the operation of the self-sealing feature of this invention.
On the left side of the figure a nail, 16, is shown in a puncturing position in the tire.
The nail, 16, is shown as passing completely through tread, 11, innerliner 14, and sealant, 15.
The tenting feature of this invention is shown by the configuration of the sealant layer around the nail, 16, on the inner periphery of the sealant at 17.
This feature is accurately depicted in the drawing by the sealant adhering to and forming a seal around nail, 16, as shown at 17.
The operation of the self-sealing feature after the piercing object has been withdrawn is shown at 18 and 19 in FIG.
1.
After the object as been withdrawn a passageway exists in the tread 11 and the innerliner 14.
This is shown by the dashed lines 18.
During withdrawal the sealant of this invention will adhere to the object and thereby be pulled through the hole caused by the piercing object closing this hole and moving radially outward into the innerliner to cause a total seal
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Manufacturing Materials 
