US 2009/0288750 A1 · TIRE WITH AIR BARRIER LAYER

Abstract

The present invention relates to a pneumatic tire having an air barrier layer, particularly an integral pneumatic tire innerliner, for prevention, or retardation, of air permeation from its inner chamber to the atmosphere through the carcass of the tire. The innerliner is comprised of an annular, cylindrical, hoop of a film having its ends overlapped and heat sealed together. The film is comprised of a continuous thermoplastic polymer phase which contains a dispersion therein of cured rubber domains, particularly cured low unsaturation rubber domains. In one embodiment, one surface of the film contains a thin bonding layer to aid in bonding the film to an unsaturated rubber-containing tire carcass. In one embodiment, the overlapping portion of the ends of the film have a thin rubber layer positioned therebetween.

Claims20

Dependent claims

A pneumatic tire which contains an innerliner film layer;

wherein said film layer is comprised of a dynamically vulcanized alloy comprised of a thermoplastic continuous phase containing a dispersion of discontinuous cured rubber domains;
characterized in that said innerliner film layer is comprised of a seamed hoop of said film wherein said seam is comprised of heat sealed overlapped ends of said film.

A process of building a tire which comprises providing a film layer on a tire building drum in a form of a hoop thereof with an overlapping end portion comprised of overlapping ends thereof heat sealed together to form a seam followed by building tire rubber components onto the building drum over said film layer to form an assembly thereof and vulcanizing the assembly in a suitable mold at an elevated temperature of form a pneumatic tire;

wherein said film layer is comprised of a dynamically vulcanized alloy comprised of a thermoplastic elastomer continuous phase containing a dispersion of discontinuous cured rubber domains;
wherein said dynamically vulcanized alloy is the product of blending of at least one thermoplastic polymer under a high shear condition at an elevated temperature sufficient to at least partially cure a dispersion of an elastomer particles within said thermoplastic polymer;
wherein said thermoplastic polymer is the continuous phase and said cured elastomer particles constitute a dispersed phase;
wherein said elastomer is comprised of a brominated copolymer of isobutylene and p-methylstyrene;
wherein said thermoplastic polymer is comprised of at least one polyamide comprised of Nylon 6, Nylon 66 and Nylon 6/66.

2 more elements

Dependencies are inferred from the claim text.

Facts

Application

12/408,067Filed 20 Mar 2009

Priority

21 May 2008

Published

26 Nov 2009

Term ends

Not estimatedThe source records don’t support an estimate.

Classification7 codes

B60C 1/0008
Tyres characterised by the chemical composition or the physical arrangement or mixture of the composition: compositions of the inner liner
B29D 30/06
Producing pneumatic or solid tyres or parts thereof: pneumatic tyres or parts thereof
B29D 30/0681
Pneumatic tyres or parts thereof: parts of pneumatic tyres; accessories, auxiliary operations
B60C 5/14
Without separate inflatable inserts, e.g. tubeless tyres with transverse section open to the rim: with impervious liner or coating on the inner…

Tire with air barrier layer

Life of this patent

Tire with air barrier layer

Life of this patent

Abstract

Claims20