# US 11,028,254 B2 · Rubber composition comprising a specific crumb rubber > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,028,254 B2 - Document ID: US11028254B2 - Status: Granted - Kind: B2 - Application number: 16/471,610 - Filed: 2017-12-19 - Published: 2020-04-30 - Granted: 2021-06-08 - Earliest claimed: 2016-12-20 - Assignees: Compagnie Generale Des Etablissements Michelin - Applicants: Compagnie Generale Des Etablissements Michelin - Inventors: Damien Thomasson; Olivia Cuscito - Web page: https://patentgrep.com/patent/US11028254B2 ## CPC - C08L 7/00: Compositions of natural rubber - B60C 1/0016: {Compositions of the tread} - C08F 36/06: Butadiene - C08F 36/08: Isoprene - C08K 3/04: Carbon - C08K 3/36: Silica - C08L 19/003: {Precrosslinked rubber; Scrap rubber; Used vulcanised rubber} - C08L 21/00: Compositions of unspecified rubbers - C08K 3/06: Sulfur - C08K 5/09: Carboxylic acids; Metal salts thereof; Anhydrides thereof - C08K 5/18: with aromatically bound amino groups - C08K 5/47: Thiazoles - C08L 2205/025: containing two or more polymers of the same hierarchy C08L, and differing only in parameters such as density, comonomer content, molecular weight, structure - C08L 2312/00: Crosslinking - C08L: COMPOSITIONS OF MACROMOLECULAR COMPOUNDS (compositions based on polymerisable monomers C08F, C08G; artificial filaments or fibres D01F; textile treating compositions D06) - B60C: VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES - C08F: MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS - C08K: Use of inorganic or non-macromolecular organic substances as compounding ingredients (paints, inks, varnishes, dyes, polishes, adhesives C09) ## Abstract A rubber composition is based on at least an elastomer, a reinforcing filler and a crosslinking system and a crumb rubber, said crumb having an isoprene elastomer content of greater than 50 phr in the composition of the crumb and a chloroform extract with a weight-average molecular weight of less than 10 000 g/mol. ## Claims ### Claim 1 A rubber composition based on at least an elastomer, a reinforcing filler, a crosslinking system, and a crumb rubber, wherein the crumb rubber has an isoprene elastomer content of greater than 50 phr in the composition of the rubber crumb and a chloroform extract with a weight-average molecular weight of less than 10,000 g/mol. ### Claim 2 (depends on 1) The rubber composition according to claim 1, wherein the crumb rubber has an isoprene elastomer content within a range extending from 60 to 100 phr. ### Claim 3 (depends on 1) The rubber composition according to claim 1, wherein the isoprene elastomer in the crumb rubber is selected from the group consisting of synthetic polyisoprenes, natural rubbers and mixtures thereof. ### Claim 4 (depends on 1) The rubber composition according to claim 1, wherein the isoprene elastomer in the crumb rubber is a natural rubber. ### Claim 5 (depends on 1) The rubber composition according to claim 1, wherein the crumb rubber is present in a content ranging from 5% to 40% by weight. ### Claim 6 (depends on 1) The rubber composition according to claim 1, wherein the crumb rubber is present in a content ranging from 5 to 100 phr. ### Claim 7 (depends on 1) The rubber composition according to claim 1, wherein the crumb rubber has an acetone extract of between 3% and 30% by weight. ### Claim 8 (depends on 1) The rubber composition according to claim 1, wherein the crumb rubber has a chloroform extract of between 5% and 85% by weight. ### Claim 9 (depends on 1) The rubber composition according to claim 1, wherein the crumb rubber has not undergone any modification by a process selected from the group consisting of thermal, mechanical, biological, and chemical treatments and combinations thereof. ### Claim 10 (depends on 9) The rubber composition according to claim 9, wherein the crumb rubber has an acetone extract of between 3% and 15% by weight. ### Claim 11 (depends on 9) The rubber composition according to claim 9, wherein the crumb rubber has a chloroform extract of between 3% and 20% by weight. ### Claim 12 (depends on 9) The rubber composition according to claim 9, wherein the crumb rubber has a ratio of a chloroform extract to an acetone extract, expressed as weight percentage, of less than 1.5. ### Claim 13 (depends on 9) The rubber composition according to claim 9, wherein the crumb rubber has a chloroform extract with a weight-average molecular weight of less than 8000 g/mol. ### Claim 14 (depends on 1) The rubber composition according to claim 1, wherein the crumb rubber has an average particle size D50 of between 10 and 400 μm. ### Claim 15 (depends on 1) The rubber composition according to claim 1, wherein the crumb rubber has a carbon black weight fraction ranging from 20% to 40%. ### Claim 16 (depends on 1) The rubber composition according to claim 1, wherein the elastomer predominantly comprises an elastomer selected from the group consisting of essentially unsaturated diene elastomers. ### Claim 17 (depends on 16) The rubber composition according to claim 16, wherein the predominant elastomer is selected from the group consisting of polybutadienes, polyisoprenes, butadiene copolymers, isoprene copolymers and mixtures thereof. ### Claim 18 (depends on 17) The rubber composition according to claim 17, wherein the predominant elastomer is selected from the group consisting of polybutadienes, polyisoprenes and mixtures thereof. ### Claim 19 (depends on 1) The rubber composition according to claim 1, wherein the reinforcing filler is selected from the group consisting of silicas, carbon blacks, and mixtures thereof. ### Claim 20 (depends on 1) The rubber composition according to claim 1, wherein a content of reinforcing filler is within a range extending from 5 to 200 phr. ### Claim 21 (depends on 1) The rubber composition according to claim 1, wherein a predominant reinforcing filler is carbon black in a content within a range extending from 30 to 90 phr. ### Claim 22 (depends on 1) The rubber composition according to claim 1, wherein a predominant reinforcing filler is silica in a content within a range extending from 30 to 90 phr. ### Claim 23 (depends on 1) A tire comprising the rubber composition according to claim 1. ### Claim 24 (depends on 23) The tire according to claim 23, wherein the rubber composition constitutes all or part of a tread of the tire.