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Self-sealing compositions

A self-sealing and composite technology, applied in transportation and packaging, special tires, tire parts, etc., can solve the problems of unusable inflatable products and escape of inflation gas

Pending Publication Date: 2021-05-18
MICHELIN & CO CIE GEN DES ESTAB MICHELIN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This perforation allows inflation gas to escape
The pressure loss caused by this puncture renders the inflatable article unusable

Method used

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Examples

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preparation example Construction

[0154] 3.2 Preparation of self-sealing composition

[0155] The self-sealing compositions according to the invention can be obtained by customary methods, for example by adding the different components in a twin-screw extruder or blade mixer, in particular with Z-shaped blades.

[0156] A first conventional method of obtaining the self-sealing composition according to the invention consists in adding thermoplastic styrene elastomer and Extender oil, thereby melting the elastomer matrix and adding extender oil. The twin-screw extruder can be any type of twin-screw extruder equipped with a hopper (for feeding the thermoplastic styrene elastomer) and at least a pressurized injection pump (for extending the oil) with a screw length of The L / D ratio between the screw diameter and the screw diameter is in the range of 20 to 40. At the point where the thermoplastic styrene elastomer was added, the temperature was close to ambient (23°C). The temperature is then brought further along...

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Abstract

The invention relates to a self-sealing composition based on at least: - a thermoplastic styrene elastomer; - a polyolefin having a number average molar mass Mn in the range of more than 550000 to 5000000 g / mol; and - at least 140 phr of an extender oil.

Description

technical field [0001] The present invention relates to self-sealing compositions and their use as puncture-resistant layers for pneumatic articles, in particular pneumatic tyres. Background technique [0002] Typically, an inflated article, such as a pneumatic tire, includes an airtight inner layer that defines its interior volume. This layer typically comprises a butyl rubber based composition which is known to be impermeable to inflation gases such as air. [0003] During its use, an inflatable article may experience punctures after being penetrated by a perforating object such as eg a nail or a screw. This perforation allows inflation gas to escape. The pressure loss caused by this puncture renders the inflatable article unusable. In the case of pneumatic tires, punctures can lead to flat tires, vehicle hobbles, and replacement of the associated wheel with a spare. [0004] To solve this puncture problem, one of the many existing solutions consists in adding to the i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B60C1/00C08L23/20C08L23/22
CPCC08L23/20C08L23/22C08L23/0815C08L2203/10C08L2205/025B29C73/163B60C19/122C08L53/00C08L53/02C08L91/00
Inventor C·肖伟尔D·冈萨雷斯S·帕加诺
Owner MICHELIN & CO CIE GEN DES ESTAB MICHELIN
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