Process for manufacturing a self-sealing composition
A composition, self-sealing technology, applied in the field of manufacturing self-sealing compositions based on diene elastomers such as natural rubber, capable of solving problems such as lack of cohesion, undesired sticking of compositions to compounding tools, etc.
Inactive Publication Date: 2011-06-22
MICHELIN & CO CIE GEN DES ESTAB MICHELIN +1
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- Abstract
- Description
- Claims
- Application Information
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Problems solved by technology
This lack of cohesion can lead to the stickiness of the composition being no longer compensated by the use of high levels of tackifier and causing the composition to be carried out
There is thus a risk of the composition sticking undesirably to the compounding tool, which is unacceptable under industrial operating conditions
Method used
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[0020] I. Detailed description of the invention
[0021] In this specification, unless expressly stated otherwise, all percentages (%) shown are in % by weight.
[0022] In addition, any range of values represented by the expression "between a and b" represents a range of values greater than a to less than b (i.e. excluding the endpoints a and b), while any range of values represented by the expression "a to b" Any interval of values refers to the range of values from end value "a" up to and including end value "b", ie, strictly inclusive of end values "a" and "b".
[0023] I-1. Method of the present invention
[0024] Therefore, the method according to the invention is characterized in that it comprises at least the following two steps:
[0025] a) firstly a masterbatch comprising at least one diene elastomer and a hydrocarbon resin in an amount greater than 30 phr is manufactured by mixing in a mixer at or at most above the softening point of said hydrocarb...
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Abstract
Process for manufacturing a self-sealing elastomer composition, said process being characterized in that it comprises at least the following steps: firstly a master batch comprising at least one diene elastomer and a thermoplastic hydrocarbon plasticizing resin having a content of greater than 30 phe (parts per 100 parts of elastomer) is prepared, by compounding these various components in a mixer at a temperature or just at what is called a 'hot compounding' temperature above the softening point of the hydrocarbon resin; ; and then at least one crosslinking system is incorporated into the master batch thus prepared, by mixing all the ingredients in the same mixer or in a different mixer, at a temperature or just at a maximum temperature which is maintained at below 100 DEG C, in order to obtain said self-sealing composition, and in that at least one liquid plasticizer having a glass transition temperature (Tg) below -20 DEG C is furthermore incorporated into said master batch or into said composition with a content of less than 60 phe.
Description
technical field [0001] The present invention relates to self-sealing compositions for use as puncture-resistant layers in any type of "inflated" article (ie defined as any article that assumes its useful shape when inflated with air). [0002] The invention relates more particularly to a process for the manufacture of self-sealing compositions based on diene elastomers such as natural rubber. Background technique [0003] In recent years, tire manufacturers have addressed a problem that has existed since the first use of pneumatic-tyred wheels, that is, how to make a vehicle continue to operate in the event of a substantial or complete loss of pressure in one or more tires , considerable efforts have been made to develop new solutions. For decades, the spare wheel was considered the only and universal solution. In recent times, the main advantages associated with its possible omission have become apparent. The concept of "high mobility" was proposed. Related technologies...
Claims
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IPC IPC(8): C08K3/06C08K3/04C08K5/31C08L7/00C08L9/00C08J3/22C08J3/20C08J3/24B29C73/16C08L97/00
CPCC08K5/0025C08K5/31C08K5/0016C08K5/01B29L2030/00C08L9/00B60C19/12B29C73/163C08L91/00C08J3/226C08L21/00C08L45/00C08J2409/00C08L7/00C08J3/201C08J2407/00C08K3/011C08K3/013C08L2666/04C08L2666/02C08L25/02
Inventor F·皮亚洛D·丰贝勒B·沃热J·梅里诺洛佩斯
Owner MICHELIN & CO CIE GEN DES ESTAB MICHELIN