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US 2012/0234449 A1Published application
Pneumatic tyre with built-in self-sealing and protective layers
AssigneesMichelin Recherche et Technique S.A., Societe De Technologie Michelin
InventorsMarc Greiveldinger, Jose Merino Lopez, Michel Ahouanto, Frédéric Pialot
Life of this patent
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Abstract
Pneumatic tyre with built-in self-sealing layer comprising an outer rubbery tread, a carcass reinforcement, a gastight layer positioned on the inside relative to the carcass reinforcement, a protective layer positioned innermost and a self-sealing layer adjacent to the protective layer and positioned on the inside relative to the gastight layer, characterized in that said protective layer is a chlorinated thermoplastic polymer film.
Claims21
1-20. (canceled)
21:
- A pneumatic tyre with built-in self-sealing layer, the tyre comprising:
- an outer rubbery tread;
- a carcass reinforcement;
- a gastight layer located at an inside position relative to the carcass reinforcement;
- a protective layer;
- and
- a self-sealing layer adjacent to the protective layer and located at an inside position relative to the gastight layer, wherein
- the protective layer is located innermost relative to the carcass reinforcement, the gastight layer, and the self-sealing layer, and
- the protective layer is a film formed of at least a chlorinated thermoplastic polymer that includes a plasticizing additive chosen from a group including ethylene/vinyl acetate copolymers, polybutenes, polyesters, vinyl chloride/vinyl acetate copolymers, mellitates, triallyl cyanurate, epoxidized oils, crosslinkable acrylic compounds, and mixtures thereof.
6 more elements
22:
- A pneumatic tyre according to claim 21, wherein the plasticizing additive is a polymer chosen from a group including ethylene/vinyl acetate copolymers, vinyl chloride/vinyl acetate copolymers, polybutenes, polyesters, crosslinkable acrylic compounds, and mixtures thereof.
23:
- A pneumatic tyre according to claim 22, wherein the polymer plasticizing additive has a number-average molecular weight (Mn) of between 2000 and 10,000 g/mol.
24:
- A pneumatic tyre according to claim 21, wherein the chlorinated thermoplastic polymer includes a secondary additive chosen from a group including tin salts, calcium salts, barium salts, zinc salts, perchlorates, amines, and mixtures thereof.
25:
- A pneumatic tyre according to claim 21, wherein the chlorinated thermoplastic polymer includes an additive chosen from a group including adipates and phthalates.
26:
- A pneumatic tyre according to claim 25, wherein a content of the additive chosen from the group including adipates and phthalates is less than 2% by weight.
27:
- A pneumatic tyre according to claim 21, wherein a number-average molecular weight (Mn) of the chlorinated thermoplastic polymer is greater than 50,000 g/mol.
28:
- A pneumatic tyre according claim 21, wherein the chlorinated thermoplastic polymer is chosen from a group including polyvinyl chloride (PVC), polyvinylidene chloride (PVDC), and chlorinated polyvinyl chloride (CPVC).
29:
- A pneumatic tyre according to claim 21, wherein a thickness of the protective layer is between 7 and 50 micrometres.
30:
- A pneumatic tyre according to claim 29, wherein the thickness of the protective layer is between 10 and 30 micrometres.
31:
- A pneumatic tyre according to claim 21, wherein a stress in the tyre relative to an initial cross section in extension at 100% uniaxial strain and at ambient temperature is less than 20 MPa.
32:
- A pneumatic tyre according to claim 21, wherein an elongation of the tyre at break in uniaxial extension and at ambient temperature of the protective layer is greater than 90%.
33:
- A pneumatic tyre according to claim 32, wherein the elongation of the tyre at break in uniaxial extension and at ambient temperature of the protective layer is greater than 150%.
34:
- A pneumatic tyre according to claim 21, wherein the self-sealing layer includes a thermoplastic styrene (TPS) elastomer and more than 200 phr of an extender oil of the TPS elastomer, with phr signifying parts by weight per 100 parts of elastomer.
35:
- A pneumatic tyre according to claim 34, wherein the TPS elastomer is a predominant elastomer of the self-sealing layer.
36:
- A pneumatic tyre according to claim 34, wherein the TPS elastomer is chosen from a group including styrene/butadiene/styrene (SBS) copolymers, styrene/isoprene/styrene (SIS) copolymers, styrene/isoprene/butadiene/styrene (SIBS) copolymers, styrene/ethylene/butylene/styrene (SEBS) copolymers, styrene/ethylene/propylene/styrene (SEPS) copolymers, styrene/ethylene/ethylene/propylene/styrene (SEEPS) block copolymers, and mixtures thereof.
37:
- A pneumatic tyre according to claim 36, wherein the TPS elastomer is chosen from a group including SEBS copolymers, SEPS copolymers, and mixtures thereof.
38:
- A pneumatic tyre according to claim 21, wherein the self-sealing layer includes:
- an unsaturated diene elastomer as a predominant elastomer;
- between 30 and 90 phr of a hydrocarbon resin;
- a liquid plasticizer having a glass transition temperature (Tg) below −20° C., at a weight content between 0 and 60 phr;
- and
- from 0 to less than 30 phr of a filler,
- wherein phr signifies parts by weight per 100 parts of elastomer.
4 more elements
39:
- A pneumatic tyre according to claim 38, wherein the unsaturated diene elastomer is chosen from a group including polybutadienes, natural rubber, synthetic polyisoprenes, butadiene copolymers, isoprene copolymers, and mixtures thereof.
40:
- A pneumatic tyre according to claim 39, wherein the unsaturated diene elastomer is chosen from a group including natural rubbers, synthetic polyisoprenes, and mixtures thereof.