TIRE PROVIDED WITH A TREAD MADE FROM A MIXTURE OF A DIENE ELASTOMER AND A THERMOPLASTIC ELASTOMER
A tire includes a tread, having improved airtightness. The tread includes at least one rubber composition comprising at least one or more diene elastomers at a total content of 1 to 99 phr, one or more thermoplastic elastomers having a polyisobutylene block at a total content of 1 to 99 phr, optionally a reinforcing filler at a content of 0 to 200 phr, and a crosslinking system.
1 .- 18 . (canceled)
19 . A tire comprising a tread including at least one rubber composition which includes:
at least one diene elastomer at a total content of 1 to 99 phr,
at least one thermoplastic elastomer having a polyisobutylene block at a total content of 1 to 99 phr,
optionally a reinforcing filler at a content of 0 to 200 phr, and
a crosslinking system.
20 . The tire according to claim 19 , wherein the content of the at least one thermoplastic elastomer having a polyisobutylene block is from 1 to 80 phr.
21 . The tire according to claim 20 , wherein the content of the at least one thermoplastic elastomer having a polyisobutylene block is from 1 to 60 phr.
22 . The tire according to claim 19 , wherein the content of the at least one thermoplastic elastomer having a polyisobutylene block is from 5 to 60 phr.
23 . The tire according to claim 22 , wherein the content of the at least one thermoplastic elastomer having a polyisobutylene block is from 5 to 50 phr.
24 . The tire according to claim 19 , wherein the at least one thermoplastic elastomer having a polyisobutylene block comprises, at at least one of the ends of the polyisobutylene block, a thermoplastic block having a glass transition temperature greater than or equal to 60° C.
25 . The tire according to claim 24 , wherein the thermoplastic block of the at least one thermoplastic elastomer having a polyisobutylene block is composed of at least one polymerized monomer selected from the group consisting of: styrene, methylstyrenes, para(tert-butyl)styrene, chlorostyrenes, bromostyrenes, fluorostyrenes, para-hydroxystyrene, and mixtures thereof.
26 . The tire according to claim 25 , wherein the at least one thermoplastic elastomer having a polyisobutylene block is selected from the group consisting of: styrene/isobutylene diblock copolymers, styrene/isobutylene/styrene triblock copolymers, and mixtures thereof.
27 . The tire according to claim 26 , wherein the at least one thermoplastic elastomer having a polyisobutylene block is a styrene/isobutylene/styrene triblock copolymer.
28 . The tire according to claim 24 , wherein the thermoplastic block of the at least one thermoplastic elastomer having a polyisobutylene block is composed of at least one polymerized monomer selected from the group consisting of: ethylene, propylene, ethylene oxide, vinyl chloride, acenaphthylene, indene, 2-methylindene, 3-methylindene, 4-methylindene, dimethylindenes, 2-phenylindene, 3-phenylindene, 4-phenylindene, isoprene, esters of acrylic acid, crotonic acid, sorbic acid and methacrylic acid, acrylamide derivatives, methacrylamide derivatives, acrylonitrile derivatives, methacrylonitrile derivatives, methyl methacrylate, cellulose derivatives, and mixtures thereof.
29 . The tire according to claim 19 , wherein the at least one diene elastomer is selected from the group consisting of: essentially unsaturated diene elastomers and mixtures thereof.
30 . The tire according to claim 29 , wherein the at least one diene elastomer is selected from the group consisting of: homopolymers obtained by polymerization of a conjugated diene monomer having from 4 to 12 carbon atoms, copolymers obtained by copolymerization of one or more conjugated dienes with one another or with one or more vinylaromatic compounds having from 8 to 20 carbon atoms, and mixtures thereof.
31 . The tire according to claim 30 , wherein the at least one diene elastomer is selected from the group consisting of: polybutadienes, synthetic polyisoprenes, natural rubber, butadiene copolymers, isoprene copolymers, and mixtures thereof.
32 . The tire according to claim 19 , wherein the content of reinforcing filler is from 20 to 200 phr.
33 . The tire according to claim 32 , wherein the content of reinforcing filler is from 30 to 150 phr.
34 . The tire according to claim 19 , wherein the content of reinforcing filler is from 50 to 120 phr.
35 . The tire according to claim 19 , wherein the reinforcing filler is carbon black, or silica, or a mixture of carbon black and silica.
36 . The tire according to claim 35 , wherein the reinforcing filler is predominantly silica.
37 . The tire according to claim 35 , wherein the reinforcing filler is predominantly carbon black.
38 . The tire according to claim 19 , wherein the content of the at least one diene elastomer is from 60 to 90 phr and the content of the at least one thermoplastic elastomer having a polyisobutylene block is from 10 to 40 phr.
39 . The tire according to claim 19 , wherein the rubber composition of the tread does not comprise a polyisobutylene elastomer.
40 . The tire according to claim 19 , wherein the rubber composition comprises less than 15 phr of a polyisobutylene elastomer.
41 . The tire according to claim 40 , wherein the rubber composition comprises less than 10 phr of a polyisobutylene elastomer.
42 . The tire according to claim 41 , wherein the rubber composition comprises less than 5 phr of a polyisobutylene elastomer.