Rubber composition comprising a specific hydrocarbon resin

Patent metadata

Field	Value
Publication number	US-2019367707-A1
Application number	US-201716472707-A
Country	US
Kind code	A1
Filing date	Dec 5, 2017
Priority date	Dec 22, 2016
Publication date	Dec 5, 2019
Grant date	—

Abstract

A rubber composition based on at least: from 50 to 100 phr of one or more diene elastomers, referred to as very low glass transition temperature (Tg) diene elastomers, having a Tg within a range of from −110° C. to −70° C., selected from butadiene homopolymers, copolymers of butadiene and of a vinylaromatic monomer, having a content of vinylaromatic units of between 0 and 5% by weight, and mixtures thereof a reinforcing filler a crosslinking system; and from 50 to 150 phr of at least one hydrocarbon resin predominantly composed of units derived from terpene and phenol monomers, the resin having a content of aromatic protons of greater than 15%.

First claim

1 .- 28 . (canceled)

29 . A rubber composition based on at least:
from 50 to 100 phr of at least one diene elastomer,
wherein the at least one diene elastomer is a very low glass transition temperature Tg diene elastomer, having a Tg within a range of from −110° C. to −70° C. and selected from the group consisting of butadiene homopolymers, copolymers of butadiene and of a vinylaromatic monomer, having a content of vinylaromatic units of between 0 and 5% by weight, and mixtures thereof;
a reinforcing filler; a crosslinking system; and from 50 to 150 phr of at least one hydrocarbon resin predominantly composed of units derived from terpene and phenol monomers, the resin having a content of aromatic protons of greater than 15%.

30 . The rubber composition according to claim 29 , wherein the very low glass transition temperature Tg diene elastomer is present at a total content of from 75 to 100 phr.

31 . The rubber composition according to claim 29 , wherein the very low glass transition temperature Tg diene elastomer has a Tg within a range of from −100° C. to −80° C.

32 . The rubber composition according to claim 29 , wherein the very low glass transition temperature Tg diene elastomer has a Mooney viscosity within a range of from 50 to 80.

33 . The rubber composition according to claim 29 , wherein the very low glass transition temperature Tg diene elastomer comprises a copolymer of butadiene and of a vinylaromatic monomer, having a content of vinylaromatic units of between 0 and 5% by weight and also a content of vinyl units relative to a diene portion ranging from 8% to 15% by weight relative to a total weight of the diene elastomer.

34 . The rubber composition according to claim 33 , wherein at least 70% by weight of the copolymer of butadiene and of a vinylaromatic monomer is functionalized.

35 . The rubber composition according to claim 34 , wherein the copolymer of butadiene and of a vinylaromatic monomer is functionalized with an alkoxysilane group, optionally partially or completely hydrolyzed to give silanol, the alkoxysilane group optionally bearing another function capable of interacting with a reinforcing filler, the alkoxysilane group being bonded to the diene elastomer by means of the silicon atom.

36 . The rubber composition according to claim 34 , wherein the copolymer of butadiene and of a vinylaromatic monomer is functionalized predominantly in the middle of the chain.

37 . The rubber composition according to claim 33 , wherein the copolymer of butadiene and of a vinylaromatic monomer comprises more than 0 and up to 30% by weight, relative to the total weight of the copolymer of butadiene and of a vinylaromatic monomer, of a star-branched copolymer of butadiene and of a vinylaromatic monomer.

38 . The rubber composition according to claim 37 , wherein the copolymer of butadiene and of a vinylaromatic monomer comprises between 0 and 20% by weight of a star-branched copolymer of butadiene and of a vinylaromatic monomer.

39 . The rubber composition according to claim 29 , wherein the copolymer of butadiene and of a vinylaromatic monomer is present at a content within a range of from 50 to 100 phr.

40 . The rubber composition according to claim 39 , wherein the copolymer of butadiene and of a vinylaromatic monomer is present at a content within a range of from 90 to 100 phr.

41 . The rubber composition according to claim 29 , wherein the very low glass transition temperature Tg diene elastomer comprises a butadiene homopolymer.

42 . The rubber composition according to claim 41 , wherein the butadiene homopolymer is present at a content within a range of from 1 to 50 phr.

43 . The rubber composition according to claim 29 , wherein a content of the hydrocarbon resin is within a range of from 55 to 120 phr.

44 . The rubber composition according to claim 29 , wherein the hydrocarbon resin has a content of aromatic protons within a range of from 15% to 40%.

45 . The rubber composition according to claim 29 , wherein the hydrocarbon resin has a content of aromatic protons within a range of from 20% to 40%.

46 . The rubber composition according to claim 29 , wherein the hydrocarbon resin has a content of hydroxyl functions of between 0 and 160 mg of KOH/g.

47 . The rubber composition according to claim 29 , wherein the hydrocarbon resin has a content of ethylenic protons of less than 1%.

48 . The rubber composition according to claim 29 , wherein the hydrocarbon resin does not comprise any ethylenic units.

49 . The rubber composition according to claim 29 , wherein the hydrocarbon resin has an Mn of greater than 600 g/mol.

50 . The rubber composition according to claim 29 , wherein the hydrocarbon resin has a polydispersity index of less than 1.7.

51 . The rubber composition according to claim 29 , wherein the reinforcing filler is selected from the group consisting of silicas, carbon blacks, and mixtures thereof.

52 . The rubber composition according to claim 29 , wherein a content of reinforcing filler is within a range of from 5 to 200 phr.

53 . The rubber composition according to claim 29 , wherein a predominant reinforcing filler is silica at a content within a range of from 40 to 150 phr.

54 . The rubber composition according to claim 53 further comprising a minority amount of carbon black at a content within a range of from 0.1 to 10 phr.

55 . A tire comprising the rubber composition according to claim 29 .

56 . The tire according to claim 55 , wherein the rubber composition constitutes all or part of a tread of the tire.

Assignees

• Michelin & Cie

Inventors

• De Gaudemaris Benoit
• Hut Alain

Classifications

• B60C11/0008

  characterised by the tread rubber · CPC title

• C08L9/06 Primary

  Copolymers with styrene · CPC title

• B60C2011/0025

  Modulus or tan delta · CPC title

• B60C1/0016

  Compositions of the tread · CPC title

• B60C1/00

  Tyres characterised by the chemical composition or the physical arrangement or mixture of the composition · CPC title