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Pneumatic tyre with built-in self-sealing ply

A pneumatic tire and self-sealing technology, which is applied to tire parts, tires, wheels, etc., can solve the problems of shortened service life and scrapping

Inactive Publication Date: 2012-07-11
MICHELIN & CO CIE GEN DES ESTAB MICHELIN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

After the vulcanized pneumatic tire is removed from the curing mold, part of the self-sealing layer can remain adhesively bonded to the wall of the membrane and lead to its rapid failure
During this high temperature vulcanization phase, components of the self-sealing layer can also migrate into the cured film, which can also shorten its service life

Method used

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  • Pneumatic tyre with built-in self-sealing ply
  • Pneumatic tyre with built-in self-sealing ply
  • Pneumatic tyre with built-in self-sealing ply

Examples

Experimental program
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Effect test

Embodiment approach

[0116] From the following description and exemplary embodiments, those skilled in the art will be able to adjust the amount of liquid plasticizer according to the particular conditions of use of the self-sealing composition, in particular of the pneumatic tire in which the self-sealing composition is intended to be used .

[0117] Preferably, the liquid plasticizer content is in the range of 5 to 40 phr, more preferably in the range of 10 to 30 phr. Below the minimum value shown, the elastomeric composition risks being too stiff for certain applications, while above the recommended maximum value, there is a risk of insufficient cohesion and degradation of the self-sealing properties of the composition.

[0118] The composition of the self-sealing layer has the essential feature of being unfilled or only very lightly filled, ie comprising 0 to less than 30 phr of filler.

[0119] In this context the term "filler" is understood to mean fillers of any type, whether they are rein...

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Abstract

The invention relates to a pneumatic tyre with a built-in self-sealing ply (11) comprising an external rubbery tyre tread (9), a carcass reinforcement (7), a gas-tight ply (10) placed on the inside of the carcass reinforcement, a protective ply (12) forming the innermost layer and a self-sealing ply (11) adjacent to the protective ply and placed on the inside of the gas-tight ply, said protective ply being a thermoplastic film comprising a copolymer with rigid blocks and flexible blocks with the formula: -(BR-BS)n-where: BR is a rigid block made up of a polyamide or a mixture of polyamides; BS is a flexible block made up of a polyether, a mixture of polyethers or a polyether-polyester copolymer; and n is the number of units (BR-BS) of said block copolymer; such as, for example, a poly(ether-block-amide) copolymer.

Description

technical field [0001] The present invention relates to pneumatic tires comprising a self-sealing layer on the inner wall thereof to seal any punctures in use, and more particularly to a pneumatic tire wherein the self-sealing layer is located on the tire of the pneumatic tire prior to its vulcanization. In blank. Background technique [0002] Many documents disclose pneumatic tires comprising a self-sealing layer on all or part of their inner surfaces. [0003] For example, document US 4 418 093 discloses a method for uniformly placing a layer of self-sealing material on the inner wall of a vulcanized pneumatic tire by rotating the pneumatic tire followed by an oscillating motion until the self-sealing material is sufficiently cross-linked so that it no longer flows. [0004] One of the problems encountered when the self-sealing layer is in the uncured green tire of a pneumatic tire is due to the very sticky nature of the self-sealing layer, which adheres strongly to the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B60C19/12B29C73/16
CPCB60C19/122B29C73/163B29L2030/00Y10T152/10666
Inventor E·库斯托代罗S·里戈J·蒂耶
Owner MICHELIN & CO CIE GEN DES ESTAB MICHELIN
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