Multilayer laminate for a tire

Patent metadata

Field	Value
Publication number	US-2016347121-A1
Application number	US-201515114506-A
Country	US
Kind code	A1
Filing date	Jan 27, 2015
Priority date	Jan 28, 2014
Publication date	Dec 1, 2016
Grant date	—

Abstract

An elastomeric laminate for tires comprises at least two superimposed layers of elastomer. The first layer is composed of a composition based on at least one thermoplastic elastomer (TPE), said thermoplastic elastomer being a block copolymer comprising at least one optionally hydrogenated butadiene/styrene random copolymer-type elastomer block and at least one styrene-type thermoplastic block, at a content within a range extending from more than 50 to 100 phr (parts by weight per 100 parts by weight of elastomer). The second layer is composed of a composition based on at least one diene elastomer, the content of diene elastomer being within a range extending from more than 50 to 95 phr, and on at least one thermoplastic elastomer (TPE), said thermoplastic elastomer being a block copolymer comprising at least one optionally hydrogenated butadiene-styrene random copolymer-type elastomer block and at least one styrene-type thermoplastic block, at a content within a range extending from 5 to less than 50 phr.

First claim

1 .- 35 . (canceled)

36 . An elastomeric laminate for tires, said laminate comprising at least two superimposed layers of elastomer:
a first layer comprising a composition based on at least one thermoplastic elastomer, said thermoplastic elastomer being a block copolymer comprising at least one optionally hydrogenated butadiene/styrene random copolymer-type elastomer block and at least one styrene-type thermoplastic block, at a content within a range extending from more than 50 to 100 phr (parts by weight per 100 parts by weight of elastomer); and a second layer comprising a composition based on at least one diene elastomer, the content of diene elastomer being within a range extending from more than 50 to 95 phr, and on at least one thermoplastic elastomer, said thermoplastic elastomer being a block copolymer comprising at least one optionally hydrogenated butadiene/styrene random copolymer-type elastomer block and at least one styrene-type thermoplastic block, at a content within a range extending from 5 to less than 50 phr.

37 . The 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.

38 . The laminate according to claim 36 , wherein the at least one elastomer block of the at least one thermoplastic elastomer is selected from elastomers having a glass transition temperature of less than 25° C.

39 . The laminate according to claim 36 , wherein the at least one elastomer block has a styrene content within a range extending from 10% to 60%.

40 . The laminate according to claim 36 , wherein the at least one elastomer block has a content of 1,2-bonds for the butadiene part within a range extending from 4 mol % to 75 mol % and a content of 1,4-bonds within a range extending from 20 mol % to 96 mol %.

41 . The laminate according to claim 36 , wherein the at least one elastomer block of the first layer is hydrogenated such that a proportion extending from 25 mol % to 100 mol % of the double bonds in the butadiene portion are hydrogenated.

42 . The laminate according to claim 41 , wherein the at least one elastomer block is hydrogenated such that a proportion extending from 50 mol % to 100 mol % of the double bonds in the butadiene portion are hydrogenated.

43 . The laminate according to claim 42 , wherein the at least one elastomer block is hydrogenated such that a proportion extending from 80 mol % to 100 mol % of the double bonds in the butadiene portion are hydrogenated.

44 . The laminate according to claim 36 , wherein the at least one elastomer block of the second layer is hydrogenated such that a proportion extending from 0 to 80 mol % of the double bonds in the butadiene portion are hydrogenated.

45 . The laminate according to claim 44 , wherein the at least one elastomer block is hydrogenated such that a proportion extending from 20 mol % to 70 mol % of the double bonds in the butadiene portion are hydrogenated.

46 . The laminate according to claim 45 , wherein the at least one elastomer block is hydrogenated such that a proportion extending from 30 mol % to 60 mol % of the double bonds in the butadiene portion are hydrogenated.

47 . The laminate according to claim 36 , wherein the at least one thermoplastic block of the block copolymer is selected from polymers having a glass transition temperature of greater than 80° C. and, in the case of a semicrystalline thermoplastic block, a melting point of greater than 80° C.

48 . The laminate according to claim 36 , wherein the fraction of the at least one thermoplastic block in the block copolymer is within a range extending from 5% to 70%.

49 . The laminate according to claim 36 , wherein the at least one thermoplastic block of the block copolymer is selected from polystyrenes.

50 . The laminate according to claim 49 , wherein the at least one thermoplastic block of the block copolymer is selected from polystyrenes obtained from styrene monomers selected from the group consisting of unsubstituted styrene, methylstyrenes, para-tert-butylstyrene, chlorostyrenes, bromostyrenes, fluorostyrenes, para-hydroxystyrene and mixtures thereof.

51 . The laminate according to claim 50 , wherein the at least one thermoplastic block of the block copolymer are selected from polystyrenes obtained from styrene monomers selected from the group consisting of unsubstituted styrene, o-methylstyrene, m-methylstyrene, p-methylstyrene, alpha-methyl styrene, alpha,2-dimethyl styrene, alpha,4-dimethyl styrene, diphenylethylene, para-tert-butyl styrene, o-chlorostyrene, m-chlorostyrene, p-chlorostyrene, 2,4-dichlorostyrene, 2,6-dichlorostyrene, 2,4,6-trichlorostyrene, o-bromostyrene, m-bromostyrene, p-bromostyrene, 2,4-dibromostyrene, 2,6-dibromostyrene, 2,4,6-tribromostyrene, o-fluorostyrene, m-fluorostyrene, p-fluorostyrene, 2,4-difluorostyrene, 2,6-difluorostyrene, 2,4,6-trifluorostyrene, para-hydroxystyrene and mixtures thereof.

52 . The laminate according to claim 51 , wherein the at least one thermoplastic block of the block copolymer is obtained from unsubstituted polystyrene.

53 . The laminate according to claim 36 , wherein the content of the at least one thermoplastic elastomer in the composition of the first layer is within a range extending from 70 to 100 phr.

54 . The laminate according to claim 53 , wherein the content of the at least one thermoplastic elastomer in the composition of the first layer is within a range extending from 80 to 100 phr.

55 . The laminate according to claim 36 , wherein the at least one thermoplastic elastomer is the only elastomer of the first layer.

56 . The laminate according to claim 36 , wherein the first layer does not contain a crosslinking system.

57 . The laminate according to claim 36 , wherein the first layer additionally comprises a thermoplastic resin comprising optionally substituted polyphenylene ether units.

58 . The laminate according to claim 57 , wherein the thermoplastic resin comprising optionally substituted polyphenylene ether units has a glass transition temperature T g , measured by DSC according to Standard ASTM D3418, 1999, within a range extending from 0 to 215° C.

59 . The laminate according to claim 57 , wherein the thermoplastic resin comprising optionally substituted polyphenylene ether units is a compound comprising predominantly polyphenylene units of general formula (I):

in which:
R 1 , R 2 , R 3 and R 4 represent, independently of one another, identical or different groups selected from hydrogen, hydroxyl, alkoxy, halogen, amino, alkylamino or dialkylamino groups or hydrocarbon-based groups comprising at least 2 carbon atoms, optionally interrupted by heteroatoms and optionally substituted; R 1 and R 3 on the one hand, and R 2 and R 4 on the other hand, possibly forming, together with the carbon atoms to which they are attached, one or more rings fused to the benzene ring of the compound of formula (I), and
n is an integer within a range extending from 3 to 300.

60 . The laminate according to claim 59 , wherein R 1 and R 2 represent an alkyl group and R 3 and R 4 represent hydrogen atoms.

61 . The laminate according to claim 60 , wherein R 1 and R 2 represent a methyl group.

62 . The laminate according to claim

Assignees

• Michelin & Cie
• Michelin Rech Tech

Inventors

• Greiveldinger Marc
• Custodero Emmanuel
• Chouvel Christophe

Classifications

• B32B2605/08

  Cars · CPC title

• B32B27/302 Primary

  comprising aromatic vinyl (co)polymers, e.g. styrenic (co)polymers · CPC title

• B32B27/285

  comprising polyethers · CPC title

• B32B27/18

  characterised by the use of special additives · CPC title

• B32B27/304

  comprising vinyl halide (co)polymers, e.g. PVC, PVDC, PVF, PVDF · CPC title