Inner tube for a pneumatic tyre based on a thermoplastic elastomer
AssigneesCompagnie Generale Des Etablissements Michelin, Michelin Recherche et Technique S.A.
InventorsJOSE MERINO LOPEZ, PIERRE LESAGE, FREDERIC PIALOT, MICHEL AHOUANTO
Life of this patent
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Abstract
Inner tube for a pneumatic tyre, notably for a bicycle, characterized in that it has an elastomeric gastight layer consisting of an elastomeric composition comprising at least one styrene/isobutylene/styrene thermoplastic elastomer (called “SIBS”) and in that it includes a self-sealing material disposed inside the cavity formed by the airtight elastomeric layer.
Claims43
An inner tube for a pneumatic tire comprising:
- an airtight elastomeric layer formed of an elastomeric composition that includes at least one styrene/isobutylene/styrene thermoplastic elastomer (SIBS elastomer);
- and
- a self-sealing material disposed inside a cavity formed by the airtight elastomeric layer,
- wherein the self-sealing material is formed of a layer of a second composition that includes, as a major elastomer, a thermoplastic styrene elastomer (TPS elastomer) and an oil for extending the TPS elastomer in an amount greater than 200 phr.
A method for producing an inner tube comprising steps of:
- forming a tube using a gastight elastomeric composition that includes at least one styrene/isobutylene/styrene thermoplastic elastomer (SIBS elastomer);
- attaching an inflating valve to the tube;
- introducing a predetermined quantity of self-sealing material into a cavity of the tube;
- and
- forming an overlapping end weld.
(canceled)
A method for producing an inner tube comprising steps of:
- forming a tube by coextruding:
- a first elastomeric composition including at least one styrene/isobutylene/styrene thermoplastic elastomer (SIBS), and
- a second elastomeric composition including a thermoplastic styrene elastomer (TPS), which is identical to or different from SIBS, and an oil for extending the TPS in an amount greater than 200 phr;
- and
- closing an inner cavity of the tube.
Dependencies are inferred from the claim text.