# US 2013/0153109 A1 · Tire, the crown area of which is provided with an inner layer for reducing running noise > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2013/0153109 A1 - Document ID: US20130153109A1 - Status: Published application - Kind: A1 - Application number: 13/699,950 - Filed: 2011-05-17 - Published: 2013-06-20 - Earliest claimed: 2010-05-27 - Assignees: Michelin Recherche et Technique S.A.; Compagnie Generale Des Etablissements Michelin - Inventors: Nanae Shimanaka; Mitsue Tanaka - Web page: https://patentgrep.com/patent/US20130153109A1 ## CPC - B60C 1/00: Tyres characterised by the chemical composition or the physical arrangement or mixture of the composition - B60C 9/18: Structure or arrangement of belts or breakers, crown-reinforcing or cushioning layers - C08K 3/04: Carbon - C08K 3/22: of metals - C08L 7/00: Compositions of natural rubber - C08L 9/00: Compositions of homopolymers or copolymers of conjugated diene hydrocarbons - C08L 9/06: Copolymers with styrene - C08L 21/00: Compositions of unspecified rubbers - C08L 57/00: Compositions of unspecified polymers obtained by reactions only involving carbon-to-carbon unsaturated bonds - Y10T 152/1081: Breaker or belt characterized by the chemical composition or physical properties of elastomer or the like - B60C: VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES - C08K: Use of inorganic or non-macromolecular organic substances as compounding ingredients (paints, inks, varnishes, dyes, polishes, adhesives C09) - C08L: COMPOSITIONS OF MACROMOLECULAR COMPOUNDS (compositions based on polymerisable monomers C08F, C08G; artificial filaments or fibres D01F; textile treating compositions D06) - Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION ## Abstract A radial tyre for reducing rolling noise includes a tread with a contact part located at a radially outer position to make contact with the road, two inextensible beads, two sidewalls connecting the beads to the tread, a carcass reinforcement, a belt arranged circumferentially between the radially outer part of the tread and the carcass reinforcement, and an inner crown layer located at a radially inner position. A formulation of the inner crown layer is different from a formulation of the contact part of the tread, and includes: 50 to 100 phr (parts by weight per hundred parts of elastomer) of a copolymer based on styrene and butadiene with a glass transition temperature of greater than −10° C., a reinforcing filler, and a crosslinking system. ## Claims ### Claim at position 1 1-17. (canceled) ### Claim 18 A radial tyre for a motor vehicle, comprising: a crown that includes a tread provided with a part located at a radially outer position, the part being intended to come into contact with a road surface; two inextensible beads; two sidewalls connecting the two inextensible beads to the tread; a carcass reinforcement passing into the two sidewalls and anchored in the two inextensible beads; a belt arranged circumferentially between the part of the tread located at the radially outer position and the carcass reinforcement; and an inner crown layer located at a radially inner position, the inner crown layer being formed of an elastomeric material having a formulation that is different from a formulation of the part of the tread located at the radially outer position, and the inner crown layer being arranged circumferentially between the part of the tread located at the radially outer position and the carcass reinforcement, wherein the inner crown layer is formed of at least a rubber composition that includes 50 to 100 phr of a copolymer based on styrene and butadiene with a glass transition temperature of greater than −10° C., a reinforcing filler, and a crosslinking system. ### Claim 19 (depends on 18) The tyre according to claim 18, wherein the copolymer based on styrene and butadiene is chosen from a group that includes: styrene-butadiene copolymers, styrene-butadiene-isoprene copolymers, and blends thereof. ### Claim 20 (depends on 19) The tyre according to claim 19, wherein the copolymer based on styrene and butadiene is a styrene-butadiene copolymer. ### Claim 21 (depends on 18) The tyre according to claim 18, wherein the copolymer based on styrene and butadiene has a glass transition temperature of greater than 0° C. ### Claim 22 (depends on 18) The tyre according to claim 18, wherein the copolymer based on styrene and butadiene is used as a mixture with not more than 50 phr of a second diene elastomer that is different from the copolymer based on styrene and butadiene. ### Claim 23 (depends on 22) The tyre according to claim 22, wherein the second diene elastomer is chosen from a group that includes: natural rubbers, synthetic polyisoprenes, polybutadienes and isoprene copolymers, and blends thereof. ### Claim 24 (depends on 23) The tyre according to claim 23, wherein the second diene elastomer is an isoprene copolymer. ### Claim 25 (depends on 23) The tyre according to claim 23, wherein the second diene elastomer is a natural rubber. ### Claim 26 (depends on 18) The tyre according to claim 18, wherein a content of the copolymer based on styrene and butadiene in the rubber composition of the inner crown layer is within a range from 50 to 90 phr. ### Claim 27 (depends on 22) The tyre according to claim 22, wherein a content of the second diene elastomer in the rubber composition of the inner crown layer is within a range from 10 to 50 phr. ### Claim 28 (depends on 18) The tyre according to claim 18, wherein a content of the reinforcing filler in the rubber composition of the inner crown layer is greater than 20 phr. ### Claim 29 (depends on 18) The tyre according to claim 18, wherein a content of reinforcing filler is within a range from 30 to 90 phr. ### Claim 30 (depends on 18) The tyre according to claim 18, wherein the reinforcing filler includes silica, or carbon black, or a mixture of silica and carbon black. ### Claim 31 (depends on 18) The tyre according to claim 18, wherein the rubber composition of the inner crown layer includes a hydrocarbon-based plasticizing resin. ### Claim 32 (depends on 18) The tyre according to claim 18, wherein the inner crown layer has a thickness of between 0.1 and 2 mm. ### Claim 33 (depends on 18) The tyre according to claim 18, wherein the inner crown layer has a thickness of between 0.2 to 1.5 mm. ### Claim 34 (depends on 18) The tyre according to claim 18, wherein the tread has a cap-base structure, and the inner crown layer constitutes a base of the cap-base structure. ### Claim 35 (depends on 18) The tyre according to claim 18, wherein the inner crown layer constitutes a belt ply reinforced with a plurality of at least one of textile reinforcements and metallic reinforcements coated by the rubber composition of the inner crown layer.