MULTILAYER LAMINATE FOR TIRES
An airtight elastomeric laminate for tires comprises at least two superimposed layers of elastomer The first layer, includes at least a thermoplastic block elastomer comprising at least one central polyisobutylene block and adjacent blocks composed of at least one polymerized monomer, other than a styrene monomer, and on a plasticizing system. At least 5 phr of the thermoplastic elastomer present in the second layer are compatible with at least 5 phr of the thermoplastic block elastomer present in the first layer.
1 .- 35 . (canceled)
36 . An airtight elastomeric laminate for tires comprising at least two superimposed layers of elastomer:
a first layer comprising at least:
a thermoplastic block elastomer comprising at least one central polyisobutylene block and adjacent blocks composed of at least one non-styrene polymerized monomer,
wherein a content of the thermoplastic block elastomer ranges from more than 50 to 100 phr, and
wherein the glass transition temperature of the non-styrene polymerized monomer constituting a thermoplastic block of the thermoplastic block elastomer is greater than or equal to 60° C. or wherein the melting point of the non-styrene polymerized monomer constituting a semicrystalline thermoplastic block is greater than 60° C., and
a plasticizing system comprising from 1 to 40 phr of a plasticizing oil and from 1 to 40 phr of a hydrocarbon resin,
wherein a total content of the plasticizing system ranges from 2 to 70 phr, and
a second layer comprising:
at least one diene elastomer,
wherein a content of the at least one diene elastomer ranges from more than 50 to 95 phr, and
at least one thermoplastic elastomer,
wherein a content of the at least one thermoplastic elastomer ranges from 5 to less than 50 phr,
wherein at least 5 phr of the at least one thermoplastic elastomer present in the second layer are compatible with at least 5 phr of the thermoplastic block elastomer present in the first layer.
37 . The airtight elastomeric laminate according to claim 36 , wherein the number-average molecular weight of the thermoplastic block elastomer is between 30,000 and 500,000 g/mol.
38 . The airtight elastomeric laminate according to claim 36 , wherein thermoplastic blocks of the thermoplastic block elastomer are selected from the group consisting of polyolefins, polyurethanes, polyamides, polyesters, polyacetals, polyethers, polyphenylene sulphides, polyfluorinated compounds, polystyrenes, polycarbonates, polysulphones, polymethyl methacrylate, polyetherimide, thermoplastic copolymers and mixtures thereof.
39 . The airtight elastomeric laminate according to claim 36 , wherein the content of the thermoplastic block elastomer ranges from 70 to 100 phr.
40 . The airtight elastomeric laminate according to claim 39 , wherein the content of the thermoplastic block elastomer ranges from 80 to 100 phr.
41 . The airtight elastomeric laminate according to claim 40 , wherein the thermoplastic block elastomer is the only elastomer of the first layer.
42 . The airtight elastomeric laminate according to claim 36 , wherein the plasticizing system comprises from 2 to 30 phr of the plasticizing oil.
43 . The airtight elastomeric laminate according to claim 42 , wherein the plasticizing system comprises from 5 to 20 phr of the plasticizing oil.
44 . The airtight elastomeric laminate according to claim 36 , wherein the plasticizing oil is selected from the group consisting of polyolefinic oils, paraffinic oils, naphthenic oils, aromatic oils, mineral oils and mixtures thereof.
45 . The airtight elastomeric laminate according to claim 44 , wherein the plasticizing oil is a polybutene oil.
46 . The airtight elastomeric laminate according to claim 45 , wherein the plasticizing oil is a polyisobutylene oil.
47 . The airtight elastomeric laminate according to claim 36 , wherein the plasticizing system comprises from 2 to 30 phr of hydrocarbon resin.
48 . The airtight elastomeric laminate according to claim 47 , wherein the plasticizing system comprises from 5 to 20 phr of hydrocarbon resin.
49 . The airtight elastomeric laminate according to claim 36 , wherein the hydrocarbon resin is selected from the group consisting of cyclopentadiene or dicyclopentadiene homopolymer or copolymer resins, terpene homopolymer or copolymer resins, terpene/phenol homopolymer or copolymer resins, C 5 fraction homopolymer or copolymer resins, C 9 fraction homopolymer or copolymer resins, α-methylstyrene homopolymer or copolymer resins and mixtures thereof.
50 . The airtight elastomeric laminate according to claim 49 , wherein the hydrocarbon resin is selected from the group consisting of copolymer resins of two different vinylaromatic monomers, (D)CPD/vinylaromatic, (D)CPD/terpene copolymer resins, (D)CPD/C 5 fraction copolymer resins, (D)CPD/C 5 fraction copolymer resins, (D)CPD/C 9 fraction copolymer resins, terpene/vinylaromatic copolymer resins, terpene/phenol copolymer resins, C 5 fraction/vinylaromatic copolymer resins and mixtures thereof.
51 . The airtight elastomeric laminate according to claim 50 , wherein the hydrocarbon resin is selected from the group consisting of (D)CPD homopolymer resins, (D)CPD/styrene copolymer resins, polylimonene resins, limonene/styrene copolymer resins, limonene/D(CPD) copolymer resins, C 5 fraction/styrene copolymer resins, C 5 fraction/C 9 fraction copolymer resins, styrene/α-methylstyrene copolymer resins and mixtures thereof.
52 . The airtight elastomeric laminate according to claim 51 , wherein the hydrocarbon resin is a styrene/α-methylstyrene copolymer resin.
53 . The airtight elastomeric laminate according to claim 36 , wherein the total content of plasticizer ranges from 5 to 45 phr.
54 . The airtight elastomeric laminate according to claim 53 , wherein the total content of plasticizer ranges from 10 to 35 phr.
55 . The airtight elastomeric laminate according to claim 36 , wherein the first layer further comprises a platy filler.
56 . The airtight elastomeric laminate according to claim 36 , wherein the first layer does not comprise a crosslinking system.
57 . The airtight elastomeric laminate according to claim 36 , wherein the number-average molecular weight of the at least one thermoplastic elastomer is between 30,000 and 500,000 g/mol.
58 . The airtight elastomeric laminate according to claim 36 , wherein elastomer blocks of the at least one thermoplastic elastomer are chosen from elastomers having a glass transition temperature of less than 25° C.
59 . The airtight elastomeric laminate according to claim 36 , wherein elastomer blocks of the at least one thermoplastic elastomer are selected from the group consisting of ethylenic elastomers, diene elastomers and mixtures thereof.
60 . The airtight elastomeric laminate according to claim 36 , wherein elastomer blocks of the at least one thermoplastic elastomer are chosen from ethylenic elastomers.
61 . The airtight elastomeric laminate according to claim 36 , wherein elastomer blocks of the at least one thermoplastic elastomer are chosen from diene elastomers.
62 . The airtight elastomeric laminate according to claim 36 , wherein thermoplastic or semicrystalline thermoplastic blocks of the at least one thermoplastic elastomer are chosen from polymers having a glass transition temperature of greater than 60° C. and polymers having a melting point of greater than 60° C.
63 . The airtight elastomeric laminate according to claim 36 , wherein thermoplastic blocks of the at least one thermoplastic elastomer are selected from the group consisting of polyolefins, polyurethanes, polyamides, polyesters, polyacetals, polyethers, polyphenylene sulphides, polyfluorinated compounds, polystyrenes, polycarbonates, polysulphones, polymethyl methacrylate, polyetherimide, thermoplastic copolymers and mixtures thereof.
64 . The airtight elastomeric laminate according to claim 36 , wherein the content of the at least one thermoplastic elastomer ranges from 5 to 45 phr.
65 . The airtight elastomeric laminate according to claim 64 , wherein the content of the at least one thermoplastic elastomer ranges from 10 to 40 phr.
66 . The airtight elastomeric laminate according to claim 36 , wherein the at least one diene elastomer is selected from the group consisting of essentially unsaturated diene elastomers and mixtures thereof.
67 . The airtight elastomeric laminate according to claim 66 , wherein the at least one diene elastomer is selected from the group consisting of the homopolymers obtained by polymerization of a conjugated diene monomer having from 4 to 12 carbon atoms, the 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.
68 . The airtight elastomeric laminate according to claim 67 , 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.
69 . The airtight elastomeric laminate according to claim 36 , wherein the second layer further comprises a reinforcing filler.
70 . The airtight elastomeric laminate according to claim 69 , wherein the reinforcing filler is carbon black, silica, or a mixture thereof.
71 . The airtight elastomeric laminate according to claim 70 , wherein the predominant reinforcing filler is carbon black.
72 . A tire comprising the airtight elastomeric laminate according to claim 36 .
73 . A pneumatic object comprising the airtight elastomeric laminate according to claim 36 .