# US 2014/0196827 A1 · Tire comprising a crown reinforcement > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2014/0196827 A1 - Document ID: US20140196827A1 - Status: Published application - Kind: A1 - Application number: 14/238,419 - Filed: 2012-08-03 - Published: 2014-07-17 - Earliest claimed: 2011-08-12 - Assignees: Compagnie Generale Des Etablissements Michelin - Inventors: Jacques Besson; Aurora Lardjane; François Dimier - Web page: https://patentgrep.com/patent/US20140196827A1 ## CPC - B60C 9/18: Structure or arrangement of belts or breakers, crown-reinforcing or cushioning layers - B60C 9/0007: {Reinforcements made of metallic elements, e.g. cords, yarns, filaments or fibres made from metal} - B60C 9/185: {between adjacent or radially below the belt plies} - B60C 2001/0075: {Compositions of belt cushioning layers} - Y10T 152/10801: Structure made up of two or more sets of plies wherein the reinforcing cords in one set lie in a different angular position relative to those in other sets - B60C: VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES - Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION ## Abstract The invention relates to a tire comprising a crown reinforcement formed of at least two working crown layers of reinforcing elements the ends of which are radially uncoupled by a polymer compound. According to the invention, the reinforcing elements of at least one working crown layer are metal cords with saturated layers, at least one internal layer being sheathed with a layer consisting of a polymer composition such as a rubber composition and in each of the shoulders of the tire, at least the uncoupling polymer compound in contact with the ends of at least two working crown layers exhibits, in the sorption test, a gas content lower than 0.06 m3STP/m3ML. ## Claims ### Claim 1 A tire with a radial carcass reinforcement, comprising at least one layer of reinforcing elements, the tire comprising a crown reinforcement formed of at least two working crown layers of reinforcing elements which are crossed from one layer to the other making with the circumferential direction angles of between 10° and 45° and the ends of which are radially uncoupled by a polymer compound, which layer is itself capped radially by a tread, the tread being connected to two beads via two sidewalls, wherein the reinforcing elements of at least one working crown layer are metal cords with saturated layers, at least one internal layer being sheathed with a layer consisting of a polymer composition and wherein, in each of the shoulders of the tire, at least the uncoupling polymer compound in contact with the ends of at least two working crown layers exhibits, in the sorption test, a gas content lower than 0.06 m3STP/m3ML. ### Claim 2 (depends on 1) The tire according to claim 1, wherein the said reinforcing elements of at least one working crown layer are metal cords with layers of construction [L+M], comprising a first layer C1 of L threads of diameter d1 wound together in a helix at a pitch p1 with L ranging from 1 to 4, which is surrounded by an external layer C2 of M threads of diameter d2 wound together in a helix at a pitch p2 with M ranging from 3 to 12, and wherein a sheath constituted by a rubber composition that is non-crosslinkable, crosslinkable or crosslinked, based on at least one diene elastomer, covers said first layer C1. ### Claim 3 (depends on 2) The tire according to claim 2, wherein the diameter of the threads of the first layer C1 is between 0.10 and 0.5 mm and wherein the diameter of the threads of the layer C2 is between 0.10 and 0.5 mm. ### Claim 4 (depends on 2) The tire according to claim 2, wherein the rubber sheath has a mean thickness ranging from 0.010 mm to 0.040 mm. ### Claim 5 (depends on 1) The tire according to claim 1, wherein at least the uncoupling polymer compound in contact with the ends of at least two working crown layers is an elastomeric compound based on natural rubber or on synthetic polyisoprene containing a majority of cis-1,4 sequences and optionally on at least one other diene elastomer, the natural rubber or the synthetic polyisoprene in the case of a cut, being present in a predominant proportion in relation to the proportion of the other diene elastomer or elastomers used and of a reinforcing filler containing: (i) carbon black with a BET specific surface area lower than 60 m2/g, used in a proportion comprised between 20 and 80 phr, (ii) a white filler of silica and/or alumina type containing SiOH and/or AlOH surface functions selected from the group consisting of precipitated or pyrogenated silicas, aluminas or alumino silicates or alternatively still carbon blacks modified during the course of or after synthesis with a specific surface comprised between 30 and 260 m2/g used at a proportion comprised between 20 and 80 phr, or (iii) a cut of carbon black described at (i) and a white filler described at (ii), in which cut the overall proportion of filler is between 20 and 80 phr. ### Claim 6 (depends on 1) The tire according to claim 1, wherein at least the uncoupling polymer compound in contact with the ends of at least two working crown layers is stoved just before being set in position during the manufacture of the tire. ### Claim 7 (depends on 1) The tire according to claim 1, wherein the crown reinforcement further comprises at least one layer of circumferential reinforcing elements. ### Claim 8 (depends on 1) The tire according to claim 1, wherein the reinforcing elements of at least one layer of the carcass reinforcement are metal cords exhibiting in what is known as the permeability test a flow rate lower than 20 cm3/min.